[Git][java-team/snappy-java][master] 5 commits: New upstream version 1.1.7.6

Emmanuel Bourg gitlab at salsa.debian.org
Wed Sep 16 17:00:16 BST 2020



Emmanuel Bourg pushed to branch master at Debian Java Maintainers / snappy-java


Commits:
89ac899a by Emmanuel Bourg at 2020-09-16T16:07:57+02:00
New upstream version 1.1.7.6
- - - - -
3ccb1f42 by Emmanuel Bourg at 2020-09-16T16:08:11+02:00
New upstream version 1.1.7.7
- - - - -
2a0e6235 by Emmanuel Bourg at 2020-09-16T16:08:13+02:00
Update upstream source from tag 'upstream/1.1.7.7'

Update to upstream version '1.1.7.7'
with Debian dir 139fcfde5d559da9f386320aeb7c2ede8b321f78
- - - - -
026272f6 by Emmanuel Bourg at 2020-09-16T16:09:43+02:00
Refreshed the patch

- - - - -
68d85ea3 by Emmanuel Bourg at 2020-09-16T17:59:29+02:00
Upload to unstable

- - - - -


29 changed files:

- + .github/workflows/snapshot.yml
- + .github/workflows/test.yml
- .scalafmt.conf
- Milestone.md
- README.md
- build.sbt
- debian/changelog
- debian/patches/01-load-library.patch
- project/build.properties
- project/plugins.sbt
- sbt
- src/main/java/org/xerial/snappy/Snappy.java
- + src/main/java/org/xerial/snappy/SnappyApi.java
- src/main/java/org/xerial/snappy/SnappyErrorCode.java
- src/main/java/org/xerial/snappy/SnappyLoader.java
- src/main/java/org/xerial/snappy/SnappyNative.java
- + src/main/java/org/xerial/snappy/pure/PureJavaSnappy.java
- + src/main/java/org/xerial/snappy/pure/SnappyConstants.java
- + src/main/java/org/xerial/snappy/pure/SnappyRawCompressor.java
- + src/main/java/org/xerial/snappy/pure/SnappyRawDecompressor.java
- + src/main/java/org/xerial/snappy/pure/UnsafeUtil.java
- + src/test/java/org/xerial/snappy/PureJavaSnappyInputStreamTest.java
- + src/test/java/org/xerial/snappy/PureJavaSnappyOutputStreamTest.java
- + src/test/java/org/xerial/snappy/PureJavaSnappyTest.java
- + src/test/java/org/xerial/snappy/PureJavaSnappyTestUtil.java
- src/test/java/org/xerial/snappy/SnappyHadoopCompatibleOutputStreamTest.java
- src/test/scala/org/xerial/snappy/SnappyPerformanceTest.scala
- src/test/scala/org/xerial/snappy/SnappySpec.scala
- version.sbt


Changes:

=====================================
.github/workflows/snapshot.yml
=====================================
@@ -0,0 +1,37 @@
+name: Snapshot Release
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - '**.scala'
+      - '**.java'
+      - '**.sbt'
+      - '.github/workflows/snapshot.yml'
+    tag:
+      - '!*'
+
+jobs:
+  publish_snapshots:
+    name: Publish snapshots
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout at v2
+        with:
+          fetch-depth: 10000
+       # Fetch all tags so that sbt-dynver can find the previous release version
+      - run: git fetch --tags
+      - uses: olafurpg/setup-scala at v5
+        with:
+          java-version: adopt at 1.11
+      - uses: actions/cache at v1
+        with:
+          path: ~/.cache
+          key: ${{ runner.os }}-snapshot-${{ hashFiles('**/*.sbt') }}
+          restore-keys: ${{ runner.os }}-snapshot-
+      - name: Publish snapshots
+        env:
+          SONATYPE_USERNAME: '${{ secrets.SONATYPE_USER }}'
+          SONATYPE_PASSWORD: '${{ secrets.SONATYPE_PASS }}'
+        run: ./sbt publish


=====================================
.github/workflows/test.yml
=====================================
@@ -0,0 +1,56 @@
+name: CI
+
+on:
+  pull_request:
+    paths:
+      - '**.scala'
+      - '**.java'
+      - '**.sbt'
+      - '.github/workflows/*.yml'
+  push:
+    branches:
+      - master
+    paths:
+      - '**.scala'
+      - '**.java'
+      - '**.sbt'
+      - '.github/workflows/*.yml'
+
+jobs:
+  code_format:
+    name: code format
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout at v2
+      - name: scalafmt test
+        run: ./sbt scalafmtCheckAll
+  test:
+    name: test jdk11
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout at v2
+      - uses: olafurpg/setup-scala at v7
+        with:
+          java-version: adopt at 1.11
+      - uses: actions/cache at v1
+        with:
+          path: ~/.cache
+          key: ${{ runner.os }}-jdk11-${{ hashFiles('**/*.sbt') }}
+          restore-keys: ${{ runner.os }}-jdk11-
+      - name: Test
+        run: ./sbt test
+  test_jdk8:
+    name: test jdk8
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout at v2
+      - uses: olafurpg/setup-scala at v7
+        with:
+          java-version: adopt at 1.8
+      - uses: actions/cache at v1
+        with:
+          path: ~/.cache
+          key: ${{ runner.os }}-jdk8-${{ hashFiles('**/*.sbt') }}
+          restore-keys: ${{ runner.os }}-jdk8-
+      - name: Test
+        run: ./sbt test


=====================================
.scalafmt.conf
=====================================
@@ -1,3 +1,4 @@
+version = 2.6.1
 maxColumn = 180
 style = defaultWithAlign
 optIn.breaksInsideChains = true


=====================================
Milestone.md
=====================================
@@ -1,6 +1,15 @@
 Since version 1.1.0.x, Java 6 (1.6) or higher is required.
 
+## snappy-java-1.1.7.6 (2020-06-26)
+ * Added an experimental support of pure-java Snappy https://github.com/xerial/snappy-java#using-pure-java-snappy-implementation
+    * Pure-java snappy doesn't support Snappy.isValidCompressedBuffer methods, but the other methods, Snappy.compress, uncompress, SnappyInput/OutputStream, SnappyFramedInput/OutputStream, etc., should work as expected.
+ * Changed the minimum JVM requirement to JDK 1.8
+
+## snappy-java-1.1.7.5 (2020-05-06)
+ * Fixes java.lang.NoClassDefFoundError: org/xerial/snappy/pool/DefaultPoolFactory in 1.1.7.4
+
 ## snapy-java-1.1.7.4 (2020-05-05)
+ * __DO NOT USE THIS VERSION__ 1.1.7.4 misses a package for using SnappyFramed streams. 
  * Caching internal buffers for SnappyFramed streams [#234](https://github.com/xerial/snappy-java/pull/234)
  * Fixed the native lib for ppc64le to work with glibc 2.17 (Previously it depended on 2.22)
 


=====================================
README.md
=====================================
@@ -33,13 +33,12 @@ snappy-java is a Java port of the snappy
  * [Release Notes](Milestone.md)
 
 The current stable version is available from here:
-  * Release version: http://central.maven.org/maven2/org/xerial/snappy/snappy-java/
+  * Release version: https://repo1.maven.org/maven2/org/xerial/snappy/snappy-java/
   * Snapshot version (the latest beta version): https://oss.sonatype.org/content/repositories/snapshots/org/xerial/snappy/snappy-java/
 
 ### Using with Maven
-  * Snappy-java is available from Maven's central repository:  <http://central.maven.org/maven2/org/xerial/snappy/snappy-java>
-
-Add the following dependency to your pom.xml:
+  
+Snappy-java is available from Maven's central repository. Add the following dependency to your pom.xml:
 
     <dependency>
       <groupId>org.xerial.snappy</groupId>
@@ -169,6 +168,12 @@ When building on Solaris, use `gmake`:
 A file `target/snappy-java-$(version).jar` is the product additionally containing the native library built for your platform.
 
 ## Miscellaneous Notes
+
+### Using pure-java Snappy implementation
+
+snappy-java can optionally use a pure-java implementation of Snappy based on [aircompressor](https://github.com/airlift/aircompressor/tree/master/src/main/java/io/airlift/compress/snappy). This implementation is selected when no native Snappy library for your platform is found. You can also force using this pure-java implementation by setting a JVM property `org.xerial.snappy.purejava=true` before loading any class of Snappy (e.g., using `-Dorg.xerial.snappy.purejava=true` option when launching JVM).
+
+
 ### Using snappy-java with Tomcat 6 (or higher) Web Server
 
 Simply put the snappy-java's jar to WEB-INF/lib folder of your web application. Usual JNI-library specific problem no longer exists since snappy-java version 1.0.3 or higher can be loaded by multiple class loaders.


=====================================
build.sbt
=====================================
@@ -2,65 +2,29 @@ name := "snappy-java"
 organization := "org.xerial.snappy"
 organizationName := "xerial.org"
 description := "snappy-java: A fast compression/decompression library"
-sonatypeProfileName := "org.xerial"
-
-credentials ++= {
-  if (sys.env.contains("SONATYPE_USERNAME") && sys.env.contains("SONATYPE_PASSWORD")) {
-    Seq(Credentials("Sonatype Nexus Repository Manager", "oss.sonatype.org", sys.env("SONATYPE_USERNAME"), sys.env("SONATYPE_PASSWORD")))
-  } else {
-    Seq.empty
-  }
-}
 
-publishTo := Some(
-  if (isSnapshot.value) {
-    Opts.resolver.sonatypeSnapshots
-  } else {
-    Opts.resolver.sonatypeStaging
-  }
+sonatypeProfileName := "org.xerial"
+publishTo in ThisBuild := sonatypePublishToBundle.value
+licenses := Seq("Apache-2.0" -> url("https://www.apache.org/licenses/LICENSE-2.0.html"))
+homepage := Some(url("https://github.com/xerial/snappy-java"))
+scmInfo := Some(
+  ScmInfo(
+    browseUrl = url("https://github.com/xerial/snappy-java"),
+    connection = "scm:git at github.com:xerial/snappy-java.git"
+  )
+)
+developers := List(
+  Developer(id = "leo", name = "Taro L. Saito", email = "leo at xerial.org", url = url("http://xerial.org/leo"))
 )
 
-pomExtra := {
-  <url>https://github.com/xerial/snappy-java</url>
-   <licenses>
-       <license>
-           <name>The Apache Software License, Version 2.0</name>
-            <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
-            <distribution>repo</distribution>
-        </license>
-    </licenses>
-    <developers>
-        <developer>
-            <id>leo</id>
-            <name>Taro L. Saito</name>
-            <email>leo at xerial.org</email>
-            <organization>Xerial Project</organization>
-            <roles>
-                <role>Architect</role>
-                <role>Project Manager</role>
-                <role>Chief Developer</role>
-            </roles>
-            <timezone>+9</timezone>
-        </developer>
-    </developers>
-    <issueManagement>
-        <system>GitHub</system>
-        <url>http://github.com/xerial/snappy-java/issues/list</url>
-    </issueManagement>
-    <inceptionYear>2011</inceptionYear>
-    <scm>
-        <connection>scm:git at github.com:xerial/snappy-java.git</connection>
-        <developerConnection>scm:git:git at github.com:xerial/snappy-java.git</developerConnection>
-        <url>git at github.com:xerial/snappy-java.git</url>
-    </scm>
-}
-
-scalaVersion in ThisBuild := "2.12.8"
+scalaVersion in ThisBuild := "2.12.11"
 
-javacOptions in (Compile, compile) ++= Seq("-encoding", "UTF-8", "-Xlint:unchecked", "-Xlint:deprecation", "-source", "1.7", "-target", "1.7")
+// For building jars for JDK7
+javacOptions in ThisBuild ++= Seq("-source", "1.8", "-target", "1.8")
+javacOptions in (Compile, compile) ++= Seq("-encoding", "UTF-8", "-Xlint:unchecked", "-Xlint:deprecation")
 
 javacOptions in doc := {
-  val opts = Seq("-source", "1.6")
+  val opts = Seq("-source", "1.8")
   if (scala.util.Properties.isJavaAtLeast("1.8"))
     opts ++ Seq("-Xdoclint:none")
   else
@@ -69,7 +33,6 @@ javacOptions in doc := {
 
 // Configuration for SnappyHadoopCompatibleOutputStream testing
 fork in Test := true
-import java.io.File
 val libTemp = {
   val path = s"${System.getProperty("java.io.tmpdir")}/snappy_test_${System.currentTimeMillis()}"
   // certain older Linux systems (debian/trusty in Travis CI) requires the libsnappy.so, loaded by
@@ -93,14 +56,11 @@ autoScalaLibrary := false
 crossPaths := false
 logBuffered in Test := false
 
-findbugsReportType := Some(FindbugsReport.FancyHtml)
-findbugsReportPath := Some(crossTarget.value / "findbugs" / "report.html")
-
 libraryDependencies ++= Seq(
   "junit"               % "junit"              % "4.8.2" % "test",
   "org.codehaus.plexus" % "plexus-classworlds" % "2.4"   % "test",
   "org.xerial.java"     % "xerial-core"        % "2.1"   % "test",
-  "org.wvlet.airframe"  %% "airframe-log"      % "0.25"  % "test",
+  "org.wvlet.airframe"  %% "airframe-log"      % "20.6.1"  % "test",
   "org.scalatest"       %% "scalatest"         % "3.0.4" % "test",
   "org.osgi"            % "org.osgi.core"      % "4.3.0" % "provided",
   "com.novocode"        % "junit-interface"    % "0.11"  % "test",
@@ -111,7 +71,7 @@ enablePlugins(SbtOsgi)
 
 osgiSettings
 
-OsgiKeys.exportPackage := Seq("org.xerial.snappy", "org.xerial.snappy.buffer", "org.xerial.snappy.pool")
+OsgiKeys.exportPackage := Seq("org.xerial.snappy", "org.xerial.snappy.buffer", "org.xerial.snappy.pool", "org.xerial.snappy.pure")
 OsgiKeys.bundleSymbolicName := "org.xerial.snappy.snappy-java"
 OsgiKeys.bundleActivator := Option("org.xerial.snappy.SnappyBundleActivator")
 OsgiKeys.importPackage := Seq("""org.osgi.framework;version="[1.5,2)"""")
@@ -147,10 +107,8 @@ OsgiKeys.additionalHeaders := Map(
 )
 
 import ReleaseTransformations._
-import sbtrelease._
 
 releaseTagName := { (version in ThisBuild).value }
-releasePublishArtifactsAction := PgpKeys.publishSigned.value
 
 releaseProcess := Seq[ReleaseStep](
   checkSnapshotDependencies,
@@ -160,9 +118,9 @@ releaseProcess := Seq[ReleaseStep](
   setReleaseVersion,
   commitReleaseVersion,
   tagRelease,
-  publishArtifacts,
+  releaseStepCommand("publishSigned"),
+  releaseStepCommand("sonatypeBundleRelease"),
   setNextVersion,
   commitNextVersion,
-  releaseStepCommand("sonatypeReleaseAll"),
   pushChanges
 )


=====================================
debian/changelog
=====================================
@@ -1,3 +1,11 @@
+snappy-java (1.1.7.7-1) unstable; urgency=medium
+
+  * Team upload.
+  * New upstream release
+    - Refreshed the patch
+
+ -- Emmanuel Bourg <ebourg at apache.org>  Wed, 16 Sep 2020 17:59:23 +0200
+
 snappy-java (1.1.7.5-1) unstable; urgency=medium
 
   * Team upload.


=====================================
debian/patches/01-load-library.patch
=====================================
@@ -3,7 +3,7 @@ Author: Emmanuel Bourg <ebourg at apache.org>
 Forwarded: not-needed
 --- a/src/main/java/org/xerial/snappy/SnappyLoader.java
 +++ b/src/main/java/org/xerial/snappy/SnappyLoader.java
-@@ -300,7 +300,7 @@
+@@ -319,7 +319,7 @@
      static File findNativeLibrary()
      {
  


=====================================
project/build.properties
=====================================
@@ -1,2 +1,2 @@
-sbt.version=1.2.8
+sbt.version=1.3.12
 


=====================================
project/plugins.sbt
=====================================
@@ -1,8 +1,6 @@
-addSbtPlugin("com.github.gseitz" % "sbt-release"  % "1.0.11")
-addSbtPlugin("org.xerial.sbt"    % "sbt-sonatype" % "2.3")
+addSbtPlugin("com.github.gseitz" % "sbt-release"  % "1.0.13")
+addSbtPlugin("org.xerial.sbt"    % "sbt-sonatype" % "3.9.3")
 addSbtPlugin("com.jsuereth"      % "sbt-pgp"      % "2.0.0-M2")
-addSbtPlugin("com.github.sbt"    % "sbt-findbugs" % "2.0.0")
 addSbtPlugin("com.github.sbt"    % "sbt-jacoco"   % "3.1.0")
-addSbtPlugin("com.typesafe.sbt"  % "sbt-osgi"     % "0.9.4")
-addSbtPlugin("io.get-coursier"   % "sbt-coursier" % "1.1.0-M7")
-addSbtPlugin("com.geirsson"      % "sbt-scalafmt" % "1.5.1")
+addSbtPlugin("com.typesafe.sbt"  % "sbt-osgi"     % "0.9.5")
+addSbtPlugin("org.scalameta"      % "sbt-scalafmt" % "2.4.0")


=====================================
sbt
=====================================
@@ -2,33 +2,61 @@
 #
 # A more capable sbt runner, coincidentally also called sbt.
 # Author: Paul Phillips <paulp at improving.org>
+# https://github.com/paulp/sbt-extras
+#
+# Generated from http://www.opensource.org/licenses/bsd-license.php
+# Copyright (c) 2011, Paul Phillips. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above copyright
+# notice, this list of conditions and the following disclaimer in the
+# documentation and/or other materials provided with the distribution.
+#     * Neither the name of the author nor the names of its contributors
+# may be used to endorse or promote products derived from this software
+# without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+# TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 set -o pipefail
 
-declare -r sbt_release_version="0.13.16"
-declare -r sbt_unreleased_version="0.13.16"
+declare -r sbt_release_version="1.3.12"
+declare -r sbt_unreleased_version="1.4.0-M1"
 
-declare -r latest_213="2.13.0-M2"
-declare -r latest_212="2.12.4"
-declare -r latest_211="2.11.11"
-declare -r latest_210="2.10.6"
+declare -r latest_213="2.13.2"
+declare -r latest_212="2.12.11"
+declare -r latest_211="2.11.12"
+declare -r latest_210="2.10.7"
 declare -r latest_29="2.9.3"
 declare -r latest_28="2.8.2"
 
 declare -r buildProps="project/build.properties"
 
-declare -r sbt_launch_ivy_release_repo="http://repo.typesafe.com/typesafe/ivy-releases"
+declare -r sbt_launch_ivy_release_repo="https://repo.typesafe.com/typesafe/ivy-releases"
 declare -r sbt_launch_ivy_snapshot_repo="https://repo.scala-sbt.org/scalasbt/ivy-snapshots"
-declare -r sbt_launch_mvn_release_repo="http://repo.scala-sbt.org/scalasbt/maven-releases"
-declare -r sbt_launch_mvn_snapshot_repo="http://repo.scala-sbt.org/scalasbt/maven-snapshots"
+declare -r sbt_launch_mvn_release_repo="https://repo.scala-sbt.org/scalasbt/maven-releases"
+declare -r sbt_launch_mvn_snapshot_repo="https://repo.scala-sbt.org/scalasbt/maven-snapshots"
 
-declare -r default_jvm_opts_common="-Xms512m -Xmx1536m -Xss2m"
-declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy"
+declare -r default_jvm_opts_common="-Xms512m -Xss2m -XX:MaxInlineLevel=18"
+declare -r noshare_opts="-Dsbt.global.base=project/.sbtboot -Dsbt.boot.directory=project/.boot -Dsbt.ivy.home=project/.ivy -Dsbt.coursier.home=project/.coursier"
 
 declare sbt_jar sbt_dir sbt_create sbt_version sbt_script sbt_new
 declare sbt_explicit_version
 declare verbose noshare batch trace_level
-declare debugUs
 
 declare java_cmd="java"
 declare sbt_launch_dir="$HOME/.sbt/launchers"
@@ -40,13 +68,17 @@ declare -a java_args scalac_args sbt_commands residual_args
 # args to jvm/sbt via files or environment variables
 declare -a extra_jvm_opts extra_sbt_opts
 
-echoerr () { echo >&2 "$@"; }
-vlog ()    { [[ -n "$verbose" ]] && echoerr "$@"; }
-die ()     { echo "Aborting: $@" ; exit 1; }
+echoerr() { echo >&2 "$@"; }
+vlog()    { [[ -n "$verbose" ]] && echoerr "$@"; }
+die()     {
+  echo "Aborting: $*"
+  exit 1
+}
 
-setTrapExit () {
+setTrapExit() {
   # save stty and trap exit, to ensure echo is re-enabled if we are interrupted.
-  export SBT_STTY="$(stty -g 2>/dev/null)"
+  SBT_STTY="$(stty -g 2>/dev/null)"
+  export SBT_STTY
 
   # restore stty settings (echo in particular)
   onSbtRunnerExit() {
@@ -62,11 +94,14 @@ setTrapExit () {
 
 # this seems to cover the bases on OSX, and someone will
 # have to tell me about the others.
-get_script_path () {
+get_script_path() {
   local path="$1"
-  [[ -L "$path" ]] || { echo "$path" ; return; }
+  [[ -L "$path" ]] || {
+    echo "$path"
+    return
+  }
 
-  local target="$(readlink "$path")"
+  local -r target="$(readlink "$path")"
   if [[ "${target:0:1}" == "/" ]]; then
     echo "$target"
   else
@@ -74,10 +109,12 @@ get_script_path () {
   fi
 }
 
-declare -r script_path="$(get_script_path "$BASH_SOURCE")"
-declare -r script_name="${script_path##*/}"
+script_path="$(get_script_path "${BASH_SOURCE[0]}")"
+declare -r script_path
+script_name="${script_path##*/}"
+declare -r script_name
 
-init_default_option_file () {
+init_default_option_file() {
   local overriding_var="${!1}"
   local default_file="$2"
   if [[ ! -r "$default_file" && "$overriding_var" =~ ^@(.*)$ ]]; then
@@ -89,82 +126,81 @@ init_default_option_file () {
   echo "$default_file"
 }
 
-declare sbt_opts_file="$(init_default_option_file SBT_OPTS .sbtopts)"
-declare jvm_opts_file="$(init_default_option_file JVM_OPTS .jvmopts)"
+sbt_opts_file="$(init_default_option_file SBT_OPTS .sbtopts)"
+jvm_opts_file="$(init_default_option_file JVM_OPTS .jvmopts)"
 
-build_props_sbt () {
-  [[ -r "$buildProps" ]] && \
+build_props_sbt() {
+  [[ -r "$buildProps" ]] &&
     grep '^sbt\.version' "$buildProps" | tr '=\r' ' ' | awk '{ print $2; }'
 }
 
-update_build_props_sbt () {
-  local ver="$1"
-  local old="$(build_props_sbt)"
-
-  [[ -r "$buildProps" ]] && [[ "$ver" != "$old" ]] && {
-    perl -pi -e "s/^sbt\.version\b.*\$/sbt.version=${ver}/" "$buildProps"
-    grep -q '^sbt.version[ =]' "$buildProps" || printf "\nsbt.version=%s\n" "$ver" >> "$buildProps"
-
-    vlog "!!!"
-    vlog "!!! Updated file $buildProps setting sbt.version to: $ver"
-    vlog "!!! Previous value was: $old"
-    vlog "!!!"
-  }
-}
-
-set_sbt_version () {
+set_sbt_version() {
   sbt_version="${sbt_explicit_version:-$(build_props_sbt)}"
   [[ -n "$sbt_version" ]] || sbt_version=$sbt_release_version
   export sbt_version
 }
 
-url_base () {
+url_base() {
   local version="$1"
 
   case "$version" in
-        0.7.*) echo "http://simple-build-tool.googlecode.com" ;;
-      0.10.* ) echo "$sbt_launch_ivy_release_repo" ;;
+    0.7.*)     echo "https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/simple-build-tool" ;;
+    0.10.*)    echo "$sbt_launch_ivy_release_repo" ;;
     0.11.[12]) echo "$sbt_launch_ivy_release_repo" ;;
     0.*-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]) # ie "*-yyyymmdd-hhMMss"
-               echo "$sbt_launch_ivy_snapshot_repo" ;;
-          0.*) echo "$sbt_launch_ivy_release_repo" ;;
-    *-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]-[0-9][0-9][0-9][0-9][0-9][0-9]) # ie "*-yyyymmdd-hhMMss"
-               echo "$sbt_launch_mvn_snapshot_repo" ;;
-            *) echo "$sbt_launch_mvn_release_repo" ;;
+      echo          "$sbt_launch_ivy_snapshot_repo" ;;
+    0.*)       echo "$sbt_launch_ivy_release_repo" ;;
+    *-[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]T[0-9][0-9][0-9][0-9][0-9][0-9]) # ie "*-yyyymmddThhMMss"
+      echo          "$sbt_launch_mvn_snapshot_repo" ;;
+    *)         echo "$sbt_launch_mvn_release_repo" ;;
   esac
 }
 
-make_url () {
+make_url() {
   local version="$1"
 
   local base="${sbt_launch_repo:-$(url_base "$version")}"
 
   case "$version" in
-        0.7.*) echo "$base/files/sbt-launch-0.7.7.jar" ;;
-      0.10.* ) echo "$base/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
+    0.7.*)     echo "$base/sbt-launch-0.7.7.jar" ;;
+    0.10.*)    echo "$base/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
     0.11.[12]) echo "$base/org.scala-tools.sbt/sbt-launch/$version/sbt-launch.jar" ;;
-          0.*) echo "$base/org.scala-sbt/sbt-launch/$version/sbt-launch.jar" ;;
-            *) echo "$base/org/scala-sbt/sbt-launch/$version/sbt-launch.jar" ;;
+    0.*)       echo "$base/org.scala-sbt/sbt-launch/$version/sbt-launch.jar" ;;
+    *)         echo "$base/org/scala-sbt/sbt-launch/$version/sbt-launch-${version}.jar" ;;
   esac
 }
 
-addJava ()     { vlog "[addJava] arg = '$1'"   ;     java_args+=("$1"); }
-addSbt ()      { vlog "[addSbt] arg = '$1'"    ;  sbt_commands+=("$1"); }
-addScalac ()   { vlog "[addScalac] arg = '$1'" ;   scalac_args+=("$1"); }
-addResidual () { vlog "[residual] arg = '$1'"  ; residual_args+=("$1"); }
+addJava()      {
+  vlog "[addJava] arg = '$1'"
+  java_args+=("$1")
+}
+addSbt()       {
+  vlog "[addSbt] arg = '$1'"
+  sbt_commands+=("$1")
+}
+addScalac()    {
+  vlog "[addScalac] arg = '$1'"
+  scalac_args+=("$1")
+}
+addResidual()  {
+  vlog "[residual] arg = '$1'"
+  residual_args+=("$1")
+}
+
+addResolver() { addSbt "set resolvers += $1"; }
 
-addResolver () { addSbt "set resolvers += $1"; }
-addDebugger () { addJava "-Xdebug" ; addJava "-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$1"; }
-setThisBuild () {
-  vlog "[addBuild] args = '$@'"
+addDebugger() { addJava "-Xdebug" && addJava "-Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=$1"; }
+
+setThisBuild() {
+  vlog "[addBuild] args = '$*'"
   local key="$1" && shift
-  addSbt "set $key in ThisBuild := $@"
+  addSbt "set $key in ThisBuild := $*"
 }
-setScalaVersion () {
+setScalaVersion() {
   [[ "$1" == *"-SNAPSHOT" ]] && addResolver 'Resolver.sonatypeRepo("snapshots")'
   addSbt "++ $1"
 }
-setJavaHome () {
+setJavaHome() {
   java_cmd="$1/bin/java"
   setThisBuild javaHome "_root_.scala.Some(file(\"$1\"))"
   export JAVA_HOME="$1"
@@ -172,13 +208,25 @@ setJavaHome () {
   export PATH="$JAVA_HOME/bin:$PATH"
 }
 
-getJavaVersion() { "$1" -version 2>&1 | grep -E -e '(java|openjdk) version' | awk '{ print $3 }' | tr -d \"; }
+getJavaVersion() {
+  local -r str=$("$1" -version 2>&1 | grep -E -e '(java|openjdk) version' | awk '{ print $3 }' | tr -d '"')
+
+  # java -version on java8 says 1.8.x
+  # but on 9 and 10 it's 9.x.y and 10.x.y.
+  if [[ "$str" =~ ^1\.([0-9]+)(\..*)?$ ]]; then
+    echo "${BASH_REMATCH[1]}"
+  elif [[ "$str" =~ ^([0-9]+)(\..*)?$ ]]; then
+    echo "${BASH_REMATCH[1]}"
+  elif [[ -n "$str" ]]; then
+    echoerr "Can't parse java version from: $str"
+  fi
+}
 
 checkJava() {
   # Warn if there is a Java version mismatch between PATH and JAVA_HOME/JDK_HOME
 
-  [[ -n "$JAVA_HOME" && -e "$JAVA_HOME/bin/java"     ]] && java="$JAVA_HOME/bin/java"
-  [[ -n "$JDK_HOME"  && -e "$JDK_HOME/lib/tools.jar" ]] && java="$JDK_HOME/bin/java"
+  [[ -n "$JAVA_HOME" && -e "$JAVA_HOME/bin/java"    ]] && java="$JAVA_HOME/bin/java"
+  [[ -n "$JDK_HOME" && -e "$JDK_HOME/lib/tools.jar" ]] && java="$JDK_HOME/bin/java"
 
   if [[ -n "$java" ]]; then
     pathJavaVersion=$(getJavaVersion java)
@@ -192,31 +240,25 @@ checkJava() {
   fi
 }
 
-java_version () {
-  local version=$(getJavaVersion "$java_cmd")
+java_version() {
+  local -r version=$(getJavaVersion "$java_cmd")
   vlog "Detected Java version: $version"
-  echo "${version:2:1}"
+  echo "$version"
 }
 
 # MaxPermSize critical on pre-8 JVMs but incurs noisy warning on 8+
-default_jvm_opts () {
-  local v="$(java_version)"
-  if [[ $v -ge 8 ]]; then
+default_jvm_opts() {
+  local -r v="$(java_version)"
+  if [[ $v -ge 10 ]]; then
+    echo "$default_jvm_opts_common -XX:+UnlockExperimentalVMOptions"
+  elif [[ $v -ge 8 ]]; then
     echo "$default_jvm_opts_common"
   else
     echo "-XX:MaxPermSize=384m $default_jvm_opts_common"
   fi
 }
 
-build_props_scala () {
-  if [[ -r "$buildProps" ]]; then
-    versionLine="$(grep '^build.scala.versions' "$buildProps")"
-    versionString="${versionLine##build.scala.versions=}"
-    echo "${versionString%% .*}"
-  fi
-}
-
-execRunner () {
+execRunner() {
   # print the arguments one to a line, quoting any containing spaces
   vlog "# Executing command line:" && {
     for arg; do
@@ -234,40 +276,36 @@ execRunner () {
   setTrapExit
 
   if [[ -n "$batch" ]]; then
-    "$@" < /dev/null
+    "$@" </dev/null
   else
     "$@"
   fi
 }
 
-jar_url ()  { make_url "$1"; }
+jar_url() { make_url "$1"; }
 
-is_cygwin () [[ "$(uname -a)" == "CYGWIN"* ]]
+is_cygwin() { [[ "$(uname -a)" == "CYGWIN"* ]]; }
 
-jar_file () {
-  is_cygwin \
-  && echo "$(cygpath -w $sbt_launch_dir/"$1"/sbt-launch.jar)" \
-  || echo "$sbt_launch_dir/$1/sbt-launch.jar"
+jar_file() {
+  is_cygwin &&
+    cygpath -w "$sbt_launch_dir/$1/sbt-launch.jar" ||
+    echo "$sbt_launch_dir/$1/sbt-launch.jar"
 }
 
-download_url () {
+download_url() {
   local url="$1"
   local jar="$2"
 
-  echoerr "Downloading sbt launcher for $sbt_version:"
-  echoerr "  From  $url"
-  echoerr "    To  $jar"
-
   mkdir -p "${jar%/*}" && {
-    if which curl >/dev/null; then
+    if command -v curl >/dev/null 2>&1; then
       curl --fail --silent --location "$url" --output "$jar"
-    elif which wget >/dev/null; then
+    elif command -v wget >/dev/null 2>&1; then
       wget -q -O "$jar" "$url"
     fi
   } && [[ -r "$jar" ]]
 }
 
-acquire_sbt_jar () {
+acquire_sbt_jar() {
   {
     sbt_jar="$(jar_file "$sbt_version")"
     [[ -r "$sbt_jar" ]]
@@ -276,11 +314,66 @@ acquire_sbt_jar () {
     [[ -r "$sbt_jar" ]]
   } || {
     sbt_jar="$(jar_file "$sbt_version")"
-    download_url "$(make_url "$sbt_version")" "$sbt_jar"
+    jar_url="$(make_url "$sbt_version")"
+
+    echoerr "Downloading sbt launcher for ${sbt_version}:"
+    echoerr "  From  ${jar_url}"
+    echoerr "    To  ${sbt_jar}"
+
+    download_url "${jar_url}" "${sbt_jar}"
+
+    case "${sbt_version}" in
+      0.*)
+        vlog "SBT versions < 1.0 do not have published MD5 checksums, skipping check"
+        echo ""
+        ;;
+      *)   verify_sbt_jar "${sbt_jar}" ;;
+    esac
   }
 }
 
-usage () {
+verify_sbt_jar() {
+  local jar="${1}"
+  local md5="${jar}.md5"
+  md5url="$(make_url "${sbt_version}").md5"
+
+  echoerr "Downloading sbt launcher ${sbt_version} md5 hash:"
+  echoerr "  From  ${md5url}"
+  echoerr "    To  ${md5}"
+
+  download_url "${md5url}" "${md5}" >/dev/null 2>&1
+
+  if command -v md5sum >/dev/null 2>&1; then
+    if echo "$(cat "${md5}")  ${jar}" | md5sum -c -; then
+      rm -rf "${md5}"
+      return 0
+    else
+      echoerr "Checksum does not match"
+      return 1
+    fi
+  elif command -v md5 >/dev/null 2>&1; then
+    if [ "$(md5 -q "${jar}")" == "$(cat "${md5}")" ]; then
+      rm -rf "${md5}"
+      return 0
+    else
+      echoerr "Checksum does not match"
+      return 1
+    fi
+  elif command -v openssl >/dev/null 2>&1; then
+    if [ "$(openssl md5 -r "${jar}" | awk '{print $1}')" == "$(cat "${md5}")" ]; then
+      rm -rf "${md5}"
+      return 0
+    else
+      echoerr "Checksum does not match"
+      return 1
+    fi
+  else
+    echoerr "Could not find an MD5 command"
+    return 1
+  fi
+}
+
+usage() {
   set_sbt_version
   cat <<EOM
 Usage: $script_name [options]
@@ -290,12 +383,6 @@ options to this runner use a single dash. Any sbt command can be scheduled
 to run first by prefixing the command with --, so --warn, --error and so on
 are not special.
 
-Output filtering: if there is a file in the home directory called .sbtignore
-and this is not an interactive sbt session, the file is treated as a list of
-bash regular expressions. Output lines which match any regex are not echoed.
-One can see exactly which lines would have been suppressed by starting this
-runner with the -x option.
-
   -h | -help         print this message
   -v                 verbose operation (this runner is chattier)
   -d, -w, -q         aliases for --debug, --warn, --error (q means quiet)
@@ -315,48 +402,49 @@ runner with the -x option.
   -script <file>     Run the specified file as a scala script
 
   # sbt version (default: sbt.version from $buildProps if present, otherwise $sbt_release_version)
-  -sbt-force-latest         force the use of the latest release of sbt: $sbt_release_version
-  -sbt-version  <version>   use the specified version of sbt (default: $sbt_release_version)
-  -sbt-dev                  use the latest pre-release version of sbt: $sbt_unreleased_version
-  -sbt-jar      <path>      use the specified jar as the sbt launcher
-  -sbt-launch-dir <path>    directory to hold sbt launchers (default: $sbt_launch_dir)
-  -sbt-launch-repo <url>    repo url for downloading sbt launcher jar (default: $(url_base "$sbt_version"))
+  -sbt-version <version>  use the specified version of sbt (default: $sbt_release_version)
+  -sbt-force-latest       force the use of the latest release of sbt: $sbt_release_version
+  -sbt-dev                use the latest pre-release version of sbt: $sbt_unreleased_version
+  -sbt-jar      <path>    use the specified jar as the sbt launcher
+  -sbt-launch-dir <path>  directory to hold sbt launchers (default: $sbt_launch_dir)
+  -sbt-launch-repo <url>  repo url for downloading sbt launcher jar (default: $(url_base "$sbt_version"))
 
   # scala version (default: as chosen by sbt)
-  -28                       use $latest_28
-  -29                       use $latest_29
-  -210                      use $latest_210
-  -211                      use $latest_211
-  -212                      use $latest_212
-  -213                      use $latest_213
-  -scala-home <path>        use the scala build at the specified directory
-  -scala-version <version>  use the specified version of scala
-  -binary-version <version> use the specified scala version when searching for dependencies
+  -28                        use $latest_28
+  -29                        use $latest_29
+  -210                       use $latest_210
+  -211                       use $latest_211
+  -212                       use $latest_212
+  -213                       use $latest_213
+  -scala-home <path>         use the scala build at the specified directory
+  -scala-version <version>   use the specified version of scala
+  -binary-version <version>  use the specified scala version when searching for dependencies
 
   # java version (default: java from PATH, currently $(java -version 2>&1 | grep version))
-  -java-home <path>         alternate JAVA_HOME
+  -java-home <path>          alternate JAVA_HOME
 
   # passing options to the jvm - note it does NOT use JAVA_OPTS due to pollution
   # The default set is used if JVM_OPTS is unset and no -jvm-opts file is found
-  <default>        $(default_jvm_opts)
-  JVM_OPTS         environment variable holding either the jvm args directly, or
-                   the reference to a file containing jvm args if given path is prepended by '@' (e.g. '@/etc/jvmopts')
-                   Note: "@"-file is overridden by local '.jvmopts' or '-jvm-opts' argument.
-  -jvm-opts <path> file containing jvm args (if not given, .jvmopts in project root is used if present)
-  -Dkey=val        pass -Dkey=val directly to the jvm
-  -J-X             pass option -X directly to the jvm (-J is stripped)
+  <default>         $(default_jvm_opts)
+  JVM_OPTS          environment variable holding either the jvm args directly, or
+                    the reference to a file containing jvm args if given path is prepended by '@' (e.g. '@/etc/jvmopts')
+                    Note: "@"-file is overridden by local '.jvmopts' or '-jvm-opts' argument.
+  -jvm-opts <path>  file containing jvm args (if not given, .jvmopts in project root is used if present)
+  -Dkey=val         pass -Dkey=val directly to the jvm
+  -J-X              pass option -X directly to the jvm (-J is stripped)
 
   # passing options to sbt, OR to this runner
-  SBT_OPTS         environment variable holding either the sbt args directly, or
-                   the reference to a file containing sbt args if given path is prepended by '@' (e.g. '@/etc/sbtopts')
-                   Note: "@"-file is overridden by local '.sbtopts' or '-sbt-opts' argument.
-  -sbt-opts <path> file containing sbt args (if not given, .sbtopts in project root is used if present)
-  -S-X             add -X to sbt's scalacOptions (-S is stripped)
+  SBT_OPTS          environment variable holding either the sbt args directly, or
+                    the reference to a file containing sbt args if given path is prepended by '@' (e.g. '@/etc/sbtopts')
+                    Note: "@"-file is overridden by local '.sbtopts' or '-sbt-opts' argument.
+  -sbt-opts <path>  file containing sbt args (if not given, .sbtopts in project root is used if present)
+  -S-X              add -X to sbt's scalacOptions (-S is stripped)
 EOM
+  exit 0
 }
 
-process_args () {
-  require_arg () {
+process_args() {
+  require_arg() {
     local type="$1"
     local opt="$2"
     local arg="$3"
@@ -367,50 +455,55 @@ process_args () {
   }
   while [[ $# -gt 0 ]]; do
     case "$1" in
-          -h|-help) usage; exit 0 ;;
-                -v) verbose=true && shift ;;
-                -d) addSbt "--debug" && shift ;;
-                -w) addSbt "--warn"  && shift ;;
-                -q) addSbt "--error" && shift ;;
-                -x) debugUs=true && shift ;;
-            -trace) require_arg integer "$1" "$2" && trace_level="$2" && shift 2 ;;
-              -ivy) require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
-        -no-colors) addJava "-Dsbt.log.noformat=true" && shift ;;
-         -no-share) noshare=true && shift ;;
-         -sbt-boot) require_arg path "$1" "$2" && addJava "-Dsbt.boot.directory=$2" && shift 2 ;;
-          -sbt-dir) require_arg path "$1" "$2" && sbt_dir="$2" && shift 2 ;;
-        -debug-inc) addJava "-Dxsbt.inc.debug=true" && shift ;;
-          -offline) addSbt "set offline in Global := true" && shift ;;
-        -jvm-debug) require_arg port "$1" "$2" && addDebugger "$2" && shift 2 ;;
-            -batch) batch=true && shift ;;
-           -prompt) require_arg "expr" "$1" "$2" && setThisBuild shellPrompt "(s => { val e = Project.extract(s) ; $2 })" && shift 2 ;;
-           -script) require_arg file "$1" "$2" && sbt_script="$2" && addJava "-Dsbt.main.class=sbt.ScriptMain" && shift 2 ;;
-
-       -sbt-create) sbt_create=true && shift ;;
-          -sbt-jar) require_arg path "$1" "$2" && sbt_jar="$2" && shift 2 ;;
+      -h |   -help) usage ;;
+      -v)           verbose=true && shift ;;
+      -d)           addSbt "--debug" && shift ;;
+      -w)           addSbt "--warn"  && shift ;;
+      -q)           addSbt "--error" && shift ;;
+      -x)           shift ;; # currently unused
+      -trace)       require_arg integer "$1" "$2" && trace_level="$2" && shift 2 ;;
+      -debug-inc)   addJava "-Dxsbt.inc.debug=true" && shift ;;
+
+      -no-colors)   addJava "-Dsbt.log.noformat=true" && shift ;;
+      -sbt-create)  sbt_create=true && shift ;;
+      -sbt-dir)     require_arg path "$1" "$2" && sbt_dir="$2" && shift 2 ;;
+      -sbt-boot)    require_arg path "$1" "$2" && addJava "-Dsbt.boot.directory=$2" && shift 2 ;;
+      -ivy)         require_arg path "$1" "$2" && addJava "-Dsbt.ivy.home=$2" && shift 2 ;;
+      -no-share)    noshare=true && shift ;;
+      -offline)     addSbt "set offline in Global := true" && shift ;;
+      -jvm-debug)   require_arg port "$1" "$2" && addDebugger "$2" && shift 2 ;;
+      -batch)       batch=true && shift ;;
+      -prompt)      require_arg "expr" "$1" "$2" && setThisBuild shellPrompt "(s => { val e = Project.extract(s) ; $2 })" && shift 2 ;;
+      -script)      require_arg file "$1" "$2" && sbt_script="$2" && addJava "-Dsbt.main.class=sbt.ScriptMain" && shift 2 ;;
+
       -sbt-version) require_arg version "$1" "$2" && sbt_explicit_version="$2" && shift 2 ;;
- -sbt-force-latest) sbt_explicit_version="$sbt_release_version" && shift ;;
-          -sbt-dev) sbt_explicit_version="$sbt_unreleased_version" && shift ;;
-   -sbt-launch-dir) require_arg path "$1" "$2" && sbt_launch_dir="$2" && shift 2 ;;
-  -sbt-launch-repo) require_arg path "$1" "$2" && sbt_launch_repo="$2" && shift 2 ;;
-    -scala-version) require_arg version "$1" "$2" && setScalaVersion "$2" && shift 2 ;;
-   -binary-version) require_arg version "$1" "$2" && setThisBuild scalaBinaryVersion "\"$2\"" && shift 2 ;;
-       -scala-home) require_arg path "$1" "$2" && setThisBuild scalaHome "_root_.scala.Some(file(\"$2\"))" && shift 2 ;;
-        -java-home) require_arg path "$1" "$2" && setJavaHome "$2" && shift 2 ;;
-         -sbt-opts) require_arg path "$1" "$2" && sbt_opts_file="$2" && shift 2 ;;
-         -jvm-opts) require_arg path "$1" "$2" && jvm_opts_file="$2" && shift 2 ;;
-
-               -D*) addJava "$1" && shift ;;
-               -J*) addJava "${1:2}" && shift ;;
-               -S*) addScalac "${1:2}" && shift ;;
-               -28) setScalaVersion "$latest_28" && shift ;;
-               -29) setScalaVersion "$latest_29" && shift ;;
-              -210) setScalaVersion "$latest_210" && shift ;;
-              -211) setScalaVersion "$latest_211" && shift ;;
-              -212) setScalaVersion "$latest_212" && shift ;;
-              -213) setScalaVersion "$latest_213" && shift ;;
-               new) sbt_new=true && : ${sbt_explicit_version:=$sbt_release_version} && addResidual "$1" && shift ;;
-                 *) addResidual "$1" && shift ;;
+      -sbt-force-latest) sbt_explicit_version="$sbt_release_version" && shift ;;
+      -sbt-dev)     sbt_explicit_version="$sbt_unreleased_version" && shift ;;
+      -sbt-jar)     require_arg path "$1" "$2" && sbt_jar="$2" && shift 2 ;;
+      -sbt-launch-dir) require_arg path "$1" "$2" && sbt_launch_dir="$2" && shift 2 ;;
+      -sbt-launch-repo) require_arg path "$1" "$2" && sbt_launch_repo="$2" && shift 2 ;;
+
+      -28)          setScalaVersion "$latest_28"  && shift ;;
+      -29)          setScalaVersion "$latest_29"  && shift ;;
+      -210)         setScalaVersion "$latest_210" && shift ;;
+      -211)         setScalaVersion "$latest_211" && shift ;;
+      -212)         setScalaVersion "$latest_212" && shift ;;
+      -213)         setScalaVersion "$latest_213" && shift ;;
+
+      -scala-version) require_arg version "$1" "$2" && setScalaVersion "$2" && shift 2 ;;
+      -binary-version) require_arg version "$1" "$2" && setThisBuild scalaBinaryVersion "\"$2\"" && shift 2 ;;
+      -scala-home)  require_arg path "$1" "$2" && setThisBuild scalaHome "_root_.scala.Some(file(\"$2\"))" && shift 2 ;;
+      -java-home)   require_arg path "$1" "$2" && setJavaHome "$2" && shift 2 ;;
+      -sbt-opts)    require_arg path "$1" "$2" && sbt_opts_file="$2" && shift 2 ;;
+      -jvm-opts)    require_arg path "$1" "$2" && jvm_opts_file="$2" && shift 2 ;;
+
+      -D*)          addJava "$1" && shift ;;
+      -J*)          addJava "${1:2}" && shift ;;
+      -S*)          addScalac "${1:2}" && shift ;;
+
+      new)          sbt_new=true && : ${sbt_explicit_version:=$sbt_release_version} && addResidual "$1" && shift ;;
+
+      *)            addResidual "$1" && shift ;;
     esac
   done
 }
@@ -422,19 +515,19 @@ process_args "$@"
 readConfigFile() {
   local end=false
   until $end; do
-    read || end=true
+    read -r || end=true
     [[ $REPLY =~ ^# ]] || [[ -z $REPLY ]] || echo "$REPLY"
-  done < "$1"
+  done <"$1"
 }
 
 # if there are file/environment sbt_opts, process again so we
 # can supply args to this runner
 if [[ -r "$sbt_opts_file" ]]; then
   vlog "Using sbt options defined in file $sbt_opts_file"
-  while read opt; do extra_sbt_opts+=("$opt"); done < <(readConfigFile "$sbt_opts_file")
+  while read -r opt; do extra_sbt_opts+=("$opt"); done < <(readConfigFile "$sbt_opts_file")
 elif [[ -n "$SBT_OPTS" && ! ("$SBT_OPTS" =~ ^@.*) ]]; then
   vlog "Using sbt options defined in variable \$SBT_OPTS"
-  extra_sbt_opts=( $SBT_OPTS )
+  IFS=" " read -r -a extra_sbt_opts <<<"$SBT_OPTS"
 else
   vlog "No extra sbt options have been defined"
 fi
@@ -453,25 +546,24 @@ checkJava
 # only exists in 0.12+
 setTraceLevel() {
   case "$sbt_version" in
-    "0.7."* | "0.10."* | "0.11."* ) echoerr "Cannot set trace level in sbt version $sbt_version" ;;
-                                 *) setThisBuild traceLevel $trace_level ;;
+    "0.7."* | "0.10."* | "0.11."*) echoerr "Cannot set trace level in sbt version $sbt_version" ;;
+    *)                             setThisBuild traceLevel "$trace_level" ;;
   esac
 }
 
 # set scalacOptions if we were given any -S opts
-[[ ${#scalac_args[@]} -eq 0 ]] || addSbt "set scalacOptions in ThisBuild += \"${scalac_args[@]}\""
+[[ ${#scalac_args[@]} -eq 0 ]] || addSbt "set scalacOptions in ThisBuild += \"${scalac_args[*]}\""
 
-# Update build.properties on disk to set explicit version - sbt gives us no choice
-[[ -n "$sbt_explicit_version" && -z "$sbt_new" ]] && update_build_props_sbt "$sbt_explicit_version"
+[[ -n "$sbt_explicit_version" && -z "$sbt_new" ]] && addJava "-Dsbt.version=$sbt_explicit_version"
 vlog "Detected sbt version $sbt_version"
 
 if [[ -n "$sbt_script" ]]; then
-  residual_args=( $sbt_script ${residual_args[@]} )
+  residual_args=("$sbt_script" "${residual_args[@]}")
 else
   # no args - alert them there's stuff in here
-  (( argumentCount > 0 )) || {
+  ((argumentCount > 0)) || {
     vlog "Starting $script_name: invoke with -help for other options"
-    residual_args=( shell )
+    residual_args=(shell)
   }
 fi
 
@@ -487,6 +579,7 @@ EOM
 }
 
 # pick up completion if present; todo
+# shellcheck disable=SC1091
 [[ -r .sbt_completion.sh ]] && source .sbt_completion.sh
 
 # directory to store sbt launchers
@@ -496,7 +589,7 @@ EOM
 # no jar? download it.
 [[ -r "$sbt_jar" ]] || acquire_sbt_jar || {
   # still no jar? uh-oh.
-  echo "Download failed. Obtain the jar manually and place it at $sbt_jar"
+  echo "Could not download and verify the launcher. Obtain the jar manually and place it at $sbt_jar"
   exit 1
 }
 
@@ -506,12 +599,12 @@ if [[ -n "$noshare" ]]; then
   done
 else
   case "$sbt_version" in
-    "0.7."* | "0.10."* | "0.11."* | "0.12."* )
+    "0.7."* | "0.10."* | "0.11."* | "0.12."*)
       [[ -n "$sbt_dir" ]] || {
         sbt_dir="$HOME/.sbt/$sbt_version"
         vlog "Using $sbt_dir as sbt dir, -sbt-dir to override."
       }
-    ;;
+      ;;
   esac
 
   if [[ -n "$sbt_dir" ]]; then
@@ -521,58 +614,21 @@ fi
 
 if [[ -r "$jvm_opts_file" ]]; then
   vlog "Using jvm options defined in file $jvm_opts_file"
-  while read opt; do extra_jvm_opts+=("$opt"); done < <(readConfigFile "$jvm_opts_file")
+  while read -r opt; do extra_jvm_opts+=("$opt"); done < <(readConfigFile "$jvm_opts_file")
 elif [[ -n "$JVM_OPTS" && ! ("$JVM_OPTS" =~ ^@.*) ]]; then
   vlog "Using jvm options defined in \$JVM_OPTS variable"
-  extra_jvm_opts=( $JVM_OPTS )
+  IFS=" " read -r -a extra_jvm_opts <<<"$JVM_OPTS"
 else
   vlog "Using default jvm options"
-  extra_jvm_opts=( $(default_jvm_opts) )
+  IFS=" " read -r -a extra_jvm_opts <<<"$( default_jvm_opts)"
 fi
 
 # traceLevel is 0.12+
 [[ -n "$trace_level" ]] && setTraceLevel
 
-main () {
-  execRunner "$java_cmd" \
-    "${extra_jvm_opts[@]}" \
-    "${java_args[@]}" \
-    -jar "$sbt_jar" \
-    "${sbt_commands[@]}" \
-    "${residual_args[@]}"
-}
-
-# sbt inserts this string on certain lines when formatting is enabled:
-#   val OverwriteLine = "\r\u001BM\u001B[2K"
-# ...in order not to spam the console with a million "Resolving" lines.
-# Unfortunately that makes it that much harder to work with when
-# we're not going to print those lines anyway. We strip that bit of
-# line noise, but leave the other codes to preserve color.
-mainFiltered () {
-  local ansiOverwrite='\r\x1BM\x1B[2K'
-  local excludeRegex=$(egrep -v '^#|^$' ~/.sbtignore | paste -sd'|' -)
-
-  echoLine () {
-    local line="$1"
-    local line1="$(echo "$line" | sed 's/\r\x1BM\x1B\[2K//g')"       # This strips the OverwriteLine code.
-    local line2="$(echo "$line1" | sed 's/\x1B\[[0-9;]*[JKmsu]//g')" # This strips all codes - we test regexes against this.
-
-    if [[ $line2 =~ $excludeRegex ]]; then
-      [[ -n $debugUs ]] && echo "[X] $line1"
-    else
-      [[ -n $debugUs ]] && echo "    $line1" || echo "$line1"
-    fi
-  }
-
-  echoLine "Starting sbt with output filtering enabled."
-  main | while read -r line; do echoLine "$line"; done
-}
-
-# Only filter if there's a filter file and we don't see a known interactive command.
-# Obviously this is super ad hoc but I don't know how to improve on it. Testing whether
-# stdin is a terminal is useless because most of my use cases for this filtering are
-# exactly when I'm at a terminal, running sbt non-interactively.
-shouldFilter () { [[ -f ~/.sbtignore ]] && ! egrep -q '\b(shell|console|consoleProject)\b' <<<"${residual_args[@]}"; }
-
-# run sbt
-if shouldFilter; then mainFiltered; else main; fi
+execRunner "$java_cmd" \
+  "${extra_jvm_opts[@]}" \
+  "${java_args[@]}" \
+  -jar "$sbt_jar" \
+  "${sbt_commands[@]}" \
+  "${residual_args[@]}"


=====================================
src/main/java/org/xerial/snappy/Snappy.java
=====================================
@@ -19,7 +19,7 @@
 // Snappy.java
 // Since: 2011/03/29
 //
-// $URL$ 
+// $URL$
 // $Author$
 //--------------------------------------
 package org.xerial.snappy;
@@ -43,18 +43,13 @@ import java.util.Properties;
 public class Snappy
 {
     static {
-        try {
-            impl = SnappyLoader.loadSnappyApi();
-        }
-        catch (Exception e) {
-            throw new ExceptionInInitializerError(e);
-        }
+        init();
     }
 
     /**
      * An instance of SnappyNative
      */
-    private static SnappyNative impl;
+    private static SnappyApi impl;
 
     /**
      * Clean up a temporary file (native lib) generated by snappy-java.
@@ -69,6 +64,15 @@ public class Snappy
         SnappyLoader.setSnappyApi(null);
     }
 
+    static void init() {
+        try {
+            impl = SnappyLoader.loadSnappyApi();
+        }
+        catch (Exception e) {
+            throw new ExceptionInInitializerError(e);
+        }
+    }
+
     /**
      * Copy bytes from source to destination
      *


=====================================
src/main/java/org/xerial/snappy/SnappyApi.java
=====================================
@@ -0,0 +1,60 @@
+package org.xerial.snappy;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+/**
+ * Snappy compressor/decompressor interface. The implementation can be JNI binding or pure-java Snappy implementation.
+ */
+public interface SnappyApi
+{
+    // ------------------------------------------------------------------------
+    // Generic compression/decompression routines.
+    // ------------------------------------------------------------------------
+    long rawCompress(long inputAddr, long inputSize, long destAddr)
+            throws IOException;
+
+    long rawUncompress(long inputAddr, long inputSize, long destAddr)
+            throws IOException;
+
+    int rawCompress(ByteBuffer input, int inputOffset, int inputLength, ByteBuffer compressed,
+            int outputOffset)
+            throws IOException;
+
+    int rawCompress(Object input, int inputOffset, int inputByteLength, Object output, int outputOffset)
+            throws IOException;
+
+    int rawUncompress(ByteBuffer compressed, int inputOffset, int inputLength, ByteBuffer uncompressed,
+            int outputOffset)
+            throws IOException;
+
+    int rawUncompress(Object input, int inputOffset, int inputLength, Object output, int outputOffset)
+            throws IOException;
+
+    // Returns the maximal size of the compressed representation of
+    // input data that is "source_bytes" bytes in length;
+    int maxCompressedLength(int source_bytes);
+
+    // This operation takes O(1) time.
+    int uncompressedLength(ByteBuffer compressed, int offset, int len)
+            throws IOException;
+
+    int uncompressedLength(Object input, int offset, int len)
+            throws IOException;
+
+    long uncompressedLength(long inputAddr, long len)
+            throws IOException;
+
+    boolean isValidCompressedBuffer(ByteBuffer compressed, int offset, int len)
+            throws IOException;
+
+    boolean isValidCompressedBuffer(Object input, int offset, int len)
+            throws IOException;
+
+    boolean isValidCompressedBuffer(long inputAddr, long offset, long len)
+            throws IOException;
+
+    void arrayCopy(Object src, int offset, int byteLength, Object dest, int dOffset)
+            throws IOException;
+
+}


=====================================
src/main/java/org/xerial/snappy/SnappyErrorCode.java
=====================================
@@ -41,7 +41,8 @@ public enum SnappyErrorCode
     FAILED_TO_UNCOMPRESS(5),
     EMPTY_INPUT(6),
     INCOMPATIBLE_VERSION(7),
-    INVALID_CHUNK_SIZE(8);
+    INVALID_CHUNK_SIZE(8),
+    UNSUPPORTED_PLATFORM(9);
 
     public final int id;
 


=====================================
src/main/java/org/xerial/snappy/SnappyLoader.java
=====================================
@@ -19,11 +19,13 @@
 // SnappyLoader.java
 // Since: 2011/03/29
 //
-// $URL$ 
+// $URL$
 // $Author$
 //--------------------------------------
 package org.xerial.snappy;
 
+import org.xerial.snappy.pure.PureJavaSnappy;
+
 import java.io.*;
 import java.net.URL;
 import java.util.Enumeration;
@@ -75,13 +77,14 @@ public class SnappyLoader
     public static final String SNAPPY_SYSTEM_PROPERTIES_FILE = "org-xerial-snappy.properties";
     public static final String KEY_SNAPPY_LIB_PATH = "org.xerial.snappy.lib.path";
     public static final String KEY_SNAPPY_LIB_NAME = "org.xerial.snappy.lib.name";
+    public static final String KEY_SNAPPY_PUREJAVA = "org.xerial.snappy.purejava";
     public static final String KEY_SNAPPY_TEMPDIR = "org.xerial.snappy.tempdir";
     public static final String KEY_SNAPPY_USE_SYSTEMLIB = "org.xerial.snappy.use.systemlib";
     public static final String KEY_SNAPPY_DISABLE_BUNDLED_LIBS = "org.xerial.snappy.disable.bundled.libs"; // Depreciated, but preserved for backward compatibility
 
     private static boolean isLoaded = false;
 
-    private static volatile SnappyNative snappyApi = null;
+    private static volatile SnappyApi snappyApi = null;
     private static volatile BitShuffleNative bitshuffleApi = null;
 
     private static File nativeLibFile = null;
@@ -101,11 +104,11 @@ public class SnappyLoader
     /**
      * Set the `snappyApi` instance.
      *
-     * @param nativeCode
+     * @param apiImpl
      */
-    static synchronized void setSnappyApi(SnappyNative nativeCode)
+    static synchronized void setSnappyApi(SnappyApi apiImpl)
     {
-        snappyApi = nativeCode;
+        snappyApi = apiImpl;
     }
 
     /**
@@ -146,13 +149,29 @@ public class SnappyLoader
         loadSnappySystemProperties();
     }
 
-    static synchronized SnappyNative loadSnappyApi()
+    static synchronized boolean isPureJava() {
+        return snappyApi != null && PureJavaSnappy.class.isAssignableFrom(snappyApi.getClass());
+    }
+
+    static synchronized SnappyApi loadSnappyApi()
     {
         if (snappyApi != null) {
             return snappyApi;
         }
-        loadNativeLibrary();
-        setSnappyApi(new SnappyNative());
+        try {
+            if(Boolean.parseBoolean(System.getProperty(KEY_SNAPPY_PUREJAVA, "false"))) {
+                // Use pure-java Snappy implementation
+                setSnappyApi(new PureJavaSnappy());
+            }
+            else {
+                loadNativeLibrary();
+                setSnappyApi(new SnappyNative());
+            }
+        }
+        catch(Exception e) {
+            // Fall-back to pure-java Snappy implementation
+            setSnappyApi(new PureJavaSnappy());
+        }
         return snappyApi;
     }
 
@@ -311,7 +330,7 @@ public class SnappyLoader
         String snappyNativeLibraryPath = System.getProperty(KEY_SNAPPY_LIB_PATH);
         String snappyNativeLibraryName = System.getProperty(KEY_SNAPPY_LIB_NAME);
 
-        // Resolve the library file name with a suffix (e.g., dll, .so, etc.) 
+        // Resolve the library file name with a suffix (e.g., dll, .so, etc.)
         if (snappyNativeLibraryName == null) {
             snappyNativeLibraryName = System.mapLibraryName("snappyjava");
         }


=====================================
src/main/java/org/xerial/snappy/SnappyNative.java
=====================================
@@ -19,7 +19,7 @@
 // SnappyNative.java
 // Since: 2011/03/30
 //
-// $URL$ 
+// $URL$
 // $Author$
 //--------------------------------------
 package org.xerial.snappy;
@@ -38,7 +38,7 @@ import java.nio.ByteBuffer;
  *
  * @author leo
  */
-public class SnappyNative
+public class SnappyNative implements SnappyApi
 {
 
     public native String nativeLibraryVersion();
@@ -46,49 +46,63 @@ public class SnappyNative
     // ------------------------------------------------------------------------
     // Generic compression/decompression routines.
     // ------------------------------------------------------------------------
+    @Override
     public native long rawCompress(long inputAddr, long inputSize, long destAddr)
             throws IOException;
 
+    @Override
     public native long rawUncompress(long inputAddr, long inputSize, long destAddr)
             throws IOException;
 
+    @Override
     public native int rawCompress(ByteBuffer input, int inputOffset, int inputLength, ByteBuffer compressed,
             int outputOffset)
             throws IOException;
 
+    @Override
     public native int rawCompress(Object input, int inputOffset, int inputByteLength, Object output, int outputOffset)
             throws IOException;
 
+    @Override
     public native int rawUncompress(ByteBuffer compressed, int inputOffset, int inputLength, ByteBuffer uncompressed,
             int outputOffset)
             throws IOException;
 
+    @Override
     public native int rawUncompress(Object input, int inputOffset, int inputLength, Object output, int outputOffset)
             throws IOException;
 
     // Returns the maximal size of the compressed representation of
     // input data that is "source_bytes" bytes in length;
+    @Override
     public native int maxCompressedLength(int source_bytes);
 
     // This operation takes O(1) time.
+    @Override
     public native int uncompressedLength(ByteBuffer compressed, int offset, int len)
             throws IOException;
 
+    @Override
     public native int uncompressedLength(Object input, int offset, int len)
             throws IOException;
 
+    @Override
     public native long uncompressedLength(long inputAddr, long len)
             throws IOException;
 
+    @Override
     public native boolean isValidCompressedBuffer(ByteBuffer compressed, int offset, int len)
             throws IOException;
 
+    @Override
     public native boolean isValidCompressedBuffer(Object input, int offset, int len)
             throws IOException;
 
+    @Override
     public native boolean isValidCompressedBuffer(long inputAddr, long offset, long len)
             throws IOException;
 
+    @Override
     public native void arrayCopy(Object src, int offset, int byteLength, Object dest, int dOffset)
             throws IOException;
 


=====================================
src/main/java/org/xerial/snappy/pure/PureJavaSnappy.java
=====================================
@@ -0,0 +1,244 @@
+package org.xerial.snappy.pure;
+
+import org.xerial.snappy.SnappyApi;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+import static org.xerial.snappy.pure.UnsafeUtil.getAddress;
+import static sun.misc.Unsafe.ARRAY_BYTE_BASE_OFFSET;
+
+/**
+ * A pure-java Snappy implementation using https://github.com/airlift/aircompressor
+ */
+public class PureJavaSnappy implements SnappyApi
+{
+    private final short[] table = new short[SnappyRawCompressor.MAX_HASH_TABLE_SIZE];
+    private final static int MAX_OUTPUT_LENGTH = Integer.MAX_VALUE;
+
+    @Override
+    public long rawCompress(long inputAddr, long inputSize, long destAddr)
+            throws IOException
+    {
+        return SnappyRawCompressor.compress(null, inputAddr, inputSize, null, destAddr, MAX_OUTPUT_LENGTH, table);
+    }
+
+    @Override
+    public long rawUncompress(long inputAddr, long inputSize, long destAddr)
+            throws IOException
+    {
+        return SnappyRawDecompressor.decompress(null, inputAddr, inputSize, null, destAddr, MAX_OUTPUT_LENGTH);
+    }
+
+    @Override
+    public int rawCompress(ByteBuffer input, int inputOffset, int inputLength, ByteBuffer compressed, int outputOffset)
+            throws IOException
+    {
+        Object inputBase;
+        long inputAddress;
+        long inputLimit;
+        if (input.isDirect()) {
+            inputBase = null;
+            long address = getAddress(input);
+            inputAddress = address + input.position();
+            inputLimit = address + input.limit();
+        }
+        else if (input.hasArray()) {
+            inputBase = input.array();
+            inputAddress = ARRAY_BYTE_BASE_OFFSET + input.arrayOffset() + input.position();
+            inputLimit = ARRAY_BYTE_BASE_OFFSET + input.arrayOffset() + input.limit();
+        }
+        else {
+            throw new IllegalArgumentException("Unsupported input ByteBuffer implementation " + input.getClass().getName());
+        }
+
+        Object outputBase;
+        long outputAddress;
+        long outputLimit;
+        if (compressed.isDirect()) {
+            outputBase = null;
+            long address = getAddress(compressed);
+            outputAddress = address + compressed.position();
+            outputLimit = address + compressed.limit();
+        }
+        else if (compressed.hasArray()) {
+            outputBase = compressed.array();
+            outputAddress = ARRAY_BYTE_BASE_OFFSET + compressed.arrayOffset() + compressed.position();
+            outputLimit = ARRAY_BYTE_BASE_OFFSET + compressed.arrayOffset() + compressed.limit();
+        }
+        else {
+            throw new IllegalArgumentException("Unsupported output ByteBuffer implementation " + compressed.getClass().getName());
+        }
+
+        // HACK: Assure JVM does not collect Slice wrappers while compressing, since the
+        // collection may trigger freeing of the underlying memory resulting in a segfault
+        // There is no other known way to signal to the JVM that an object should not be
+        // collected in a block, and technically, the JVM is allowed to eliminate these locks.
+        synchronized (input) {
+            synchronized (compressed) {
+                int written = SnappyRawCompressor.compress(
+                        inputBase,
+                        inputAddress,
+                        inputLimit,
+                        outputBase,
+                        outputAddress,
+                        outputLimit,
+                        table);
+                compressed.position(compressed.position() + written);
+                return written;
+            }
+        }
+    }
+
+    @Override
+    public int rawCompress(Object input, int inputOffset, int inputByteLength, Object output, int outputOffset)
+            throws IOException
+    {
+        long inputAddress = ARRAY_BYTE_BASE_OFFSET + inputOffset;
+        long inputLimit = inputAddress + inputByteLength;
+        long outputAddress = ARRAY_BYTE_BASE_OFFSET + outputOffset;
+        long outputLimit = outputAddress + MAX_OUTPUT_LENGTH;
+
+        return SnappyRawCompressor.compress(input, inputAddress, inputLimit, output, outputAddress, outputLimit, table);
+    }
+
+    @Override
+    public int rawUncompress(ByteBuffer compressed, int inputOffset, int inputLength, ByteBuffer uncompressed, int outputOffset)
+            throws IOException
+    {
+        Object inputBase;
+        long inputAddress;
+        long inputLimit;
+        if (compressed.isDirect()) {
+            inputBase = null;
+            long address = getAddress(compressed);
+            inputAddress = address + compressed.position();
+            inputLimit = address + compressed.limit();
+        }
+        else if (compressed.hasArray()) {
+            inputBase = compressed.array();
+            inputAddress = ARRAY_BYTE_BASE_OFFSET + compressed.arrayOffset() + compressed.position();
+            inputLimit = ARRAY_BYTE_BASE_OFFSET + compressed.arrayOffset() + compressed.limit();
+        }
+        else {
+            throw new IllegalArgumentException("Unsupported input ByteBuffer implementation " + compressed.getClass().getName());
+        }
+
+        Object outputBase;
+        long outputAddress;
+        long outputLimit;
+        if (uncompressed.isDirect()) {
+            outputBase = null;
+            long address = getAddress(uncompressed);
+            outputAddress = address + uncompressed.position();
+            outputLimit = address + uncompressed.limit();
+        }
+        else if (uncompressed.hasArray()) {
+            outputBase = uncompressed.array();
+            outputAddress = ARRAY_BYTE_BASE_OFFSET + uncompressed.arrayOffset() + uncompressed.position();
+            outputLimit = ARRAY_BYTE_BASE_OFFSET + uncompressed.arrayOffset() + uncompressed.limit();
+        }
+        else {
+            throw new IllegalArgumentException("Unsupported output ByteBuffer implementation " + uncompressed.getClass().getName());
+        }
+
+        // HACK: Assure JVM does not collect Slice wrappers while decompressing, since the
+        // collection may trigger freeing of the underlying memory resulting in a segfault
+        // There is no other known way to signal to the JVM that an object should not be
+        // collected in a block, and technically, the JVM is allowed to eliminate these locks.
+        synchronized (compressed) {
+            synchronized (uncompressed) {
+                int written = SnappyRawDecompressor.decompress(inputBase, inputAddress, inputLimit, outputBase, outputAddress, outputLimit);
+                uncompressed.position(uncompressed.position() + written);
+                return written;
+            }
+        }
+    }
+
+    @Override
+    public int rawUncompress(Object input, int inputOffset, int inputLength, Object output, int outputOffset)
+            throws IOException
+    {
+        long inputAddress = ARRAY_BYTE_BASE_OFFSET + inputOffset;
+        long inputLimit = inputAddress + inputLength;
+        long outputAddress = ARRAY_BYTE_BASE_OFFSET + outputOffset;
+        long outputLimit = outputAddress + MAX_OUTPUT_LENGTH;
+
+        return SnappyRawDecompressor.decompress(input, inputAddress, inputLimit, output, outputAddress, outputLimit);
+    }
+
+    @Override
+    public int maxCompressedLength(int source_bytes)
+    {
+        return SnappyRawCompressor.maxCompressedLength(source_bytes);
+    }
+
+    @Override
+    public int uncompressedLength(ByteBuffer compressed, int offset, int len)
+            throws IOException
+    {
+        Object inputBase;
+        long inputAddress;
+        long inputLimit;
+        if(compressed.isDirect()) {
+            inputBase = null;
+            long address = getAddress(compressed);
+            inputAddress = address + compressed.position();
+            inputLimit = address + compressed.limit();
+        }
+        else if (compressed.hasArray()){
+            inputBase = compressed.array();
+            inputAddress = ARRAY_BYTE_BASE_OFFSET + offset;
+            inputLimit = ARRAY_BYTE_BASE_OFFSET + len;
+        }
+        else {
+            throw new IllegalArgumentException("Unsupported input ByteBuffer implementation: " + compressed.getClass().getName());
+        }
+        return SnappyRawDecompressor.getUncompressedLength(inputBase, inputAddress, inputLimit);
+    }
+
+    @Override
+    public int uncompressedLength(Object input, int offset, int len)
+            throws IOException
+    {
+        long compressedAddress = ARRAY_BYTE_BASE_OFFSET + offset;
+        long compressedLimit = ARRAY_BYTE_BASE_OFFSET + len;
+
+        return SnappyRawDecompressor.getUncompressedLength(input, compressedAddress, compressedLimit);
+    }
+
+    @Override
+    public long uncompressedLength(long inputAddr, long len)
+            throws IOException
+    {
+        return SnappyRawDecompressor.getUncompressedLength(null, inputAddr, inputAddr + len);
+    }
+
+    @Override
+    public boolean isValidCompressedBuffer(ByteBuffer compressed, int offset, int len)
+            throws IOException
+    {
+        throw new UnsupportedOperationException("isValidCompressedBuffer is not supported in pure-java mode");
+    }
+
+    @Override
+    public boolean isValidCompressedBuffer(Object input, int offset, int len)
+            throws IOException
+    {
+        throw new UnsupportedOperationException("isValidCompressedBuffer is not supported in pure-java mode");
+    }
+
+    @Override
+    public boolean isValidCompressedBuffer(long inputAddr, long offset, long len)
+            throws IOException
+    {
+        throw new UnsupportedOperationException("isValidCompressedBuffer is not supported in pure-java mode");
+    }
+
+    @Override
+    public void arrayCopy(Object src, int offset, int byteLength, Object dest, int dOffset)
+            throws IOException
+    {
+        System.arraycopy(src, offset, dest, dOffset, byteLength);
+    }
+}


=====================================
src/main/java/org/xerial/snappy/pure/SnappyConstants.java
=====================================
@@ -0,0 +1,29 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.xerial.snappy.pure;
+
+final class SnappyConstants
+{
+    static final int SIZE_OF_SHORT = 2;
+    static final int SIZE_OF_INT = 4;
+    static final int SIZE_OF_LONG = 8;
+
+    static final int LITERAL = 0;
+    static final int COPY_1_BYTE_OFFSET = 1;  // 3 bit length + 3 bits of offset in opcode
+    static final int COPY_2_BYTE_OFFSET = 2;
+
+    private SnappyConstants()
+    {
+    }
+}


=====================================
src/main/java/org/xerial/snappy/pure/SnappyRawCompressor.java
=====================================
@@ -0,0 +1,409 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.xerial.snappy.pure;
+import java.util.Arrays;
+
+import static org.xerial.snappy.pure.SnappyConstants.COPY_1_BYTE_OFFSET;
+import static org.xerial.snappy.pure.SnappyConstants.COPY_2_BYTE_OFFSET;
+import static org.xerial.snappy.pure.SnappyConstants.SIZE_OF_INT;
+import static org.xerial.snappy.pure.SnappyConstants.SIZE_OF_LONG;
+import static org.xerial.snappy.pure.SnappyConstants.SIZE_OF_SHORT;
+import static org.xerial.snappy.pure.UnsafeUtil.UNSAFE;
+
+public final class SnappyRawCompressor
+{
+    // The size of a compression block. Note that many parts of the compression
+    // code assumes that BLOCK_SIZE <= 65536; in particular, the hash table
+    // can only store 16-bit offsets, and EmitCopy() also assumes the offset
+    // is 65535 bytes or less. Note also that if you change this, it will
+    // affect the framing format (see framing_format.txt).
+    //
+    // Note that there might be older data around that is compressed with larger
+    // block sizes, so the decompression code should not rely on the
+    // non-existence of long back-references.
+    private static final int BLOCK_LOG = 16;
+    private static final int BLOCK_SIZE = 1 << BLOCK_LOG;
+
+    private static final int INPUT_MARGIN_BYTES = 15;
+
+    private static final int MAX_HASH_TABLE_BITS = 14;
+    public static final int MAX_HASH_TABLE_SIZE = 1 << MAX_HASH_TABLE_BITS;
+
+    private SnappyRawCompressor() {}
+
+    public static int maxCompressedLength(int sourceLength)
+    {
+        // Compressed data can be defined as:
+        //    compressed := item* literal*
+        //    item       := literal* copy
+        //
+        // The trailing literal sequence has a space blowup of at most 62/60
+        // since a literal of length 60 needs one tag byte + one extra byte
+        // for length information.
+        //
+        // Item blowup is trickier to measure.  Suppose the "copy" op copies
+        // 4 bytes of data.  Because of a special check in the encoding code,
+        // we produce a 4-byte copy only if the offset is < 65536.  Therefore
+        // the copy op takes 3 bytes to encode, and this type of item leads
+        // to at most the 62/60 blowup for representing literals.
+        //
+        // Suppose the "copy" op copies 5 bytes of data.  If the offset is big
+        // enough, it will take 5 bytes to encode the copy op.  Therefore the
+        // worst case here is a one-byte literal followed by a five-byte copy.
+        // I.e., 6 bytes of input turn into 7 bytes of "compressed" data.
+        //
+        // This last factor dominates the blowup, so the final estimate is:
+        return 32 + sourceLength + sourceLength / 6;
+    }
+
+    // suppress warnings is required to use assert
+    @SuppressWarnings("IllegalToken")
+    public static int compress(
+            final Object inputBase,
+            final long inputAddress,
+            final long inputLimit,
+            final Object outputBase,
+            final long outputAddress,
+            final long outputLimit,
+            final short[] table)
+    {
+        // The compression code assumes output is larger than the max compression size (with 32 bytes of
+        // extra padding), and does not check bounds for writing to output.
+        int maxCompressedLength = maxCompressedLength((int) (inputLimit - inputAddress));
+        if (outputLimit - outputAddress < maxCompressedLength) {
+            throw new IllegalArgumentException("Output buffer must be at least " + maxCompressedLength + " bytes");
+        }
+
+        // First write the uncompressed size to the output as a variable length int
+        long output = writeUncompressedLength(outputBase, outputAddress, (int) (inputLimit - inputAddress));
+
+        for (long blockAddress = inputAddress; blockAddress < inputLimit; blockAddress += BLOCK_SIZE) {
+            final long blockLimit = Math.min(inputLimit, blockAddress + BLOCK_SIZE);
+            long input = blockAddress;
+            assert blockLimit - blockAddress <= BLOCK_SIZE;
+
+            int blockHashTableSize = getHashTableSize((int) (blockLimit - blockAddress));
+            Arrays.fill(table, 0, blockHashTableSize, (short) 0);
+
+            // todo given that hashTableSize is required to be a power of 2, this is overly complex
+            final int shift = 32 - log2Floor(blockHashTableSize);
+            assert (blockHashTableSize & (blockHashTableSize - 1)) == 0 : "table must be power of two";
+            assert 0xFFFFFFFF >>> shift == blockHashTableSize - 1;
+
+            // Bytes in [nextEmitAddress, input) will be emitted as literal bytes.  Or
+            // [nextEmitAddress, inputLimit) after the main loop.
+            long nextEmitAddress = input;
+
+            final long fastInputLimit = blockLimit - INPUT_MARGIN_BYTES;
+            while (input <= fastInputLimit) {
+                assert nextEmitAddress <= input;
+
+                // The body of this loop emits a literal once and then emits a copy one
+                // or more times.  (The exception is that when we're close to exhausting
+                // the input we exit and emit a literal.)
+                //
+                // In the first iteration of this loop we're just starting, so
+                // there's nothing to copy, so we must emit a literal once.  And we
+                // only start a new iteration when the current iteration has determined
+                // that a literal will precede the next copy (if any).
+                //
+                // Step 1: Scan forward in the input looking for a 4-byte-long match.
+                // If we get close to exhausting the input exit and emit a final literal.
+                //
+                // Heuristic match skipping: If 32 bytes are scanned with no matches
+                // found, start looking only at every other byte. If 32 more bytes are
+                // scanned, look at every third byte, etc.. When a match is found,
+                // immediately go back to looking at every byte. This is a small loss
+                // (~5% performance, ~0.1% density) for compressible data due to more
+                // bookkeeping, but for non-compressible data (such as JPEG) it's a huge
+                // win since the compressor quickly "realizes" the data is incompressible
+                // and doesn't bother looking for matches everywhere.
+                //
+                // The "skip" variable keeps track of how many bytes there are since the
+                // last match; dividing it by 32 (ie. right-shifting by five) gives the
+                // number of bytes to move ahead for each iteration.
+                int skip = 32;
+
+                long candidateIndex = 0;
+                for (input += 1; input + (skip >>> 5) <= fastInputLimit; input += ((skip++) >>> 5)) {
+                    // hash the 4 bytes starting at the input pointer
+                    int currentInt = UNSAFE.getInt(inputBase, input);
+                    int hash = hashBytes(currentInt, shift);
+
+                    // get the position of a 4 bytes sequence with the same hash
+                    candidateIndex = blockAddress + (table[hash] & 0xFFFF);
+                    assert candidateIndex >= 0;
+                    assert candidateIndex < input;
+
+                    // update the hash to point to the current position
+                    table[hash] = (short) (input - blockAddress);
+
+                    // if the 4 byte sequence a the candidate index matches the sequence at the
+                    // current position, proceed to the next phase
+                    if (currentInt == UNSAFE.getInt(inputBase, candidateIndex)) {
+                        break;
+                    }
+                }
+                if (input + (skip >>> 5) > fastInputLimit) {
+                    break;
+                }
+
+                // Step 2: A 4-byte match has been found.  We'll later see if more
+                // than 4 bytes match.  But, prior to the match, input
+                // bytes [nextEmit, ip) are unmatched.  Emit them as "literal bytes."
+                assert nextEmitAddress + 16 <= blockLimit;
+
+                int literalLength = (int) (input - nextEmitAddress);
+                output = emitLiteralLength(outputBase, output, literalLength);
+
+                // Fast copy can use 8 extra bytes of input and output, which is safe because:
+                //   - The input will always have INPUT_MARGIN_BYTES = 15 extra available bytes
+                //   - The output will always have 32 spare bytes (see MaxCompressedLength).
+                output = fastCopy(inputBase, nextEmitAddress, outputBase, output, literalLength);
+
+                // Step 3: Call EmitCopy, and then see if another EmitCopy could
+                // be our next move.  Repeat until we find no match for the
+                // input immediately after what was consumed by the last EmitCopy call.
+                //
+                // If we exit this loop normally then we need to call EmitLiteral next,
+                // though we don't yet know how big the literal will be.  We handle that
+                // by proceeding to the next iteration of the main loop.  We also can exit
+                // this loop via goto if we get close to exhausting the input.
+                int inputBytes;
+                do {
+                    // We have a 4-byte match at input, and no need to emit any
+                    // "literal bytes" prior to input.
+                    assert (blockLimit >= input + SIZE_OF_INT);
+
+                    // determine match length
+                    int matched = count(inputBase, input + SIZE_OF_INT, candidateIndex + SIZE_OF_INT, blockLimit);
+                    matched += SIZE_OF_INT;
+
+                    // Emit the copy operation for this chunk
+                    output = emitCopy(outputBase, output, input, candidateIndex, matched);
+                    input += matched;
+
+                    // are we done?
+                    if (input >= fastInputLimit) {
+                        break;
+                    }
+
+                    // We could immediately start working at input now, but to improve
+                    // compression we first update table[Hash(ip - 1, ...)].
+                    long longValue = UNSAFE.getLong(inputBase, input - 1);
+                    int prevInt = (int) longValue;
+                    inputBytes = (int) (longValue >>> 8);
+
+                    // add hash starting with previous byte
+                    int prevHash = hashBytes(prevInt, shift);
+                    table[prevHash] = (short) (input - blockAddress - 1);
+
+                    // update hash of current byte
+                    int curHash = hashBytes(inputBytes, shift);
+
+                    candidateIndex = blockAddress + (table[curHash] & 0xFFFF);
+                    table[curHash] = (short) (input - blockAddress);
+                } while (inputBytes == UNSAFE.getInt(inputBase, candidateIndex));
+                nextEmitAddress = input;
+            }
+
+            // Emit the remaining bytes as a literal
+            if (nextEmitAddress < blockLimit) {
+                int literalLength = (int) (blockLimit - nextEmitAddress);
+                output = emitLiteralLength(outputBase, output, literalLength);
+                UNSAFE.copyMemory(inputBase, nextEmitAddress, outputBase, output, literalLength);
+                output += literalLength;
+            }
+        }
+
+        return (int) (output - outputAddress);
+    }
+
+    private static int count(Object inputBase, final long start, long matchStart, long matchLimit)
+    {
+        long current = start;
+
+        // first, compare long at a time
+        while (current < matchLimit - (SIZE_OF_LONG - 1)) {
+            long diff = UNSAFE.getLong(inputBase, matchStart) ^ UNSAFE.getLong(inputBase, current);
+            if (diff != 0) {
+                current += Long.numberOfTrailingZeros(diff) >> 3;
+                return (int) (current - start);
+            }
+
+            current += SIZE_OF_LONG;
+            matchStart += SIZE_OF_LONG;
+        }
+
+        if (current < matchLimit - (SIZE_OF_INT - 1) && UNSAFE.getInt(inputBase, matchStart) == UNSAFE.getInt(inputBase, current)) {
+            current += SIZE_OF_INT;
+            matchStart += SIZE_OF_INT;
+        }
+
+        if (current < matchLimit - (SIZE_OF_SHORT - 1) && UNSAFE.getShort(inputBase, matchStart) == UNSAFE.getShort(inputBase, current)) {
+            current += SIZE_OF_SHORT;
+            matchStart += SIZE_OF_SHORT;
+        }
+
+        if (current < matchLimit && UNSAFE.getByte(inputBase, matchStart) == UNSAFE.getByte(inputBase, current)) {
+            ++current;
+        }
+
+        return (int) (current - start);
+    }
+
+    private static long emitLiteralLength(Object outputBase, long output, int literalLength)
+    {
+        int n = literalLength - 1;      // Zero-length literals are disallowed
+        if (n < 60) {
+            // Size fits in tag byte
+            UNSAFE.putByte(outputBase, output++, (byte) (n << 2));
+        }
+        else {
+            int bytes;
+            if (n < (1 << 8)) {
+                UNSAFE.putByte(outputBase, output++, (byte) (59 + 1 << 2));
+                bytes = 1;
+            }
+            else if (n < (1 << 16)) {
+                UNSAFE.putByte(outputBase, output++, (byte) (59 + 2 << 2));
+                bytes = 2;
+            }
+            else if (n < (1 << 24)) {
+                UNSAFE.putByte(outputBase, output++, (byte) (59 + 3 << 2));
+                bytes = 3;
+            }
+            else {
+                UNSAFE.putByte(outputBase, output++, (byte) (59 + 4 << 2));
+                bytes = 4;
+            }
+            // System is assumed to be little endian, so low bytes will be zero for the smaller numbers
+            UNSAFE.putInt(outputBase, output, n);
+            output += bytes;
+        }
+        return output;
+    }
+
+    private static long fastCopy(final Object inputBase, long input, final Object outputBase, long output, final int literalLength)
+    {
+        final long outputLimit = output + literalLength;
+        do {
+            UNSAFE.putLong(outputBase, output, UNSAFE.getLong(inputBase, input));
+            input += SIZE_OF_LONG;
+            output += SIZE_OF_LONG;
+        }
+        while (output < outputLimit);
+        return outputLimit;
+    }
+
+    private static long emitCopy(Object outputBase, long output, long input, long matchIndex, int matchLength)
+    {
+        long offset = input - matchIndex;
+
+        // Emit 64 byte copies but make sure to keep at least four bytes reserved
+        while (matchLength >= 68) {
+            UNSAFE.putByte(outputBase, output++, (byte) (COPY_2_BYTE_OFFSET + ((64 - 1) << 2)));
+            UNSAFE.putShort(outputBase, output, (short) offset);
+            output += SIZE_OF_SHORT;
+            matchLength -= 64;
+        }
+
+        // Emit an extra 60 byte copy if have too much data to fit in one copy
+        // length < 68
+        if (matchLength > 64) {
+            UNSAFE.putByte(outputBase, output++, (byte) (COPY_2_BYTE_OFFSET + ((60 - 1) << 2)));
+            UNSAFE.putShort(outputBase, output, (short) offset);
+            output += SIZE_OF_SHORT;
+            matchLength -= 60;
+        }
+
+        // Emit remainder
+        if ((matchLength < 12) && (offset < 2048)) {
+            int lenMinus4 = matchLength - 4;
+            UNSAFE.putByte(outputBase, output++, (byte) (COPY_1_BYTE_OFFSET + ((lenMinus4) << 2) + ((offset >>> 8) << 5)));
+            UNSAFE.putByte(outputBase, output++, (byte) (offset));
+        }
+        else {
+            UNSAFE.putByte(outputBase, output++, (byte) (COPY_2_BYTE_OFFSET + ((matchLength - 1) << 2)));
+            UNSAFE.putShort(outputBase, output, (short) offset);
+            output += SIZE_OF_SHORT;
+        }
+        return output;
+    }
+
+    @SuppressWarnings("IllegalToken")
+    private static int getHashTableSize(int inputSize)
+    {
+        // Use smaller hash table when input.size() is smaller, since we
+        // fill the table, incurring O(hash table size) overhead for
+        // compression, and if the input is short, we won't need that
+        // many hash table entries anyway.
+        assert (MAX_HASH_TABLE_SIZE >= 256);
+
+        // smallest power of 2 larger than inputSize
+        int target = Integer.highestOneBit(inputSize - 1) << 1;
+
+        // keep it between MIN_TABLE_SIZE and MAX_TABLE_SIZE
+        return Math.max(Math.min(target, MAX_HASH_TABLE_SIZE), 256);
+    }
+
+    // Any hash function will produce a valid compressed stream, but a good
+    // hash function reduces the number of collisions and thus yields better
+    // compression for compressible input, and more speed for incompressible
+    // input. Of course, it doesn't hurt if the hash function is reasonably fast
+    // either, as it gets called a lot.
+    private static int hashBytes(int value, int shift)
+    {
+        return (value * 0x1e35a7bd) >>> shift;
+    }
+
+    private static int log2Floor(int n)
+    {
+        return n == 0 ? -1 : 31 ^ Integer.numberOfLeadingZeros(n);
+    }
+
+    private static final int HIGH_BIT_MASK = 0x80;
+    /**
+     * Writes the uncompressed length as variable length integer.
+     */
+    private static long writeUncompressedLength(Object outputBase, long outputAddress, int uncompressedLength)
+    {
+        if (uncompressedLength < (1 << 7) && uncompressedLength >= 0) {
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength));
+        }
+        else if (uncompressedLength < (1 << 14) && uncompressedLength > 0) {
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength >>> 7));
+        }
+        else if (uncompressedLength < (1 << 21) && uncompressedLength > 0) {
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) ((uncompressedLength >>> 7) | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength >>> 14));
+        }
+        else if (uncompressedLength < (1 << 28) && uncompressedLength > 0) {
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) ((uncompressedLength >>> 7) | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) ((uncompressedLength >>> 14) | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength >>> 21));
+        }
+        else {
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) ((uncompressedLength >>> 7) | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) ((uncompressedLength >>> 14) | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) ((uncompressedLength >>> 21) | HIGH_BIT_MASK));
+            UNSAFE.putByte(outputBase, outputAddress++, (byte) (uncompressedLength >>> 28));
+        }
+        return outputAddress;
+    }
+}


=====================================
src/main/java/org/xerial/snappy/pure/SnappyRawDecompressor.java
=====================================
@@ -0,0 +1,316 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.xerial.snappy.pure;
+
+import org.xerial.snappy.SnappyError;
+import org.xerial.snappy.SnappyErrorCode;
+
+import static org.xerial.snappy.pure.SnappyConstants.LITERAL;
+import static org.xerial.snappy.pure.SnappyConstants.SIZE_OF_INT;
+import static org.xerial.snappy.pure.SnappyConstants.SIZE_OF_LONG;
+import static org.xerial.snappy.pure.UnsafeUtil.UNSAFE;
+
+public final class SnappyRawDecompressor
+{
+    private static final int[] DEC_32_TABLE = {4, 1, 2, 1, 4, 4, 4, 4};
+    private static final int[] DEC_64_TABLE = {0, 0, 0, -1, 0, 1, 2, 3};
+
+    private SnappyRawDecompressor() {}
+
+    public static int getUncompressedLength(Object compressed, long compressedAddress, long compressedLimit)
+    {
+        return readUncompressedLength(compressed, compressedAddress, compressedLimit)[0];
+    }
+
+    public static int decompress(
+            final Object inputBase,
+            final long inputAddress,
+            final long inputLimit,
+            final Object outputBase,
+            final long outputAddress,
+            final long outputLimit)
+    {
+        // Read the uncompressed length from the front of the input
+        long input = inputAddress;
+        int[] varInt = readUncompressedLength(inputBase, input, inputLimit);
+        int expectedLength = varInt[0];
+        input += varInt[1];
+
+        if(!(expectedLength <= (outputLimit - outputAddress))) {
+            throw new SnappyError(SnappyErrorCode.INVALID_CHUNK_SIZE, String.format("Uncompressed length %s must be less than %s", expectedLength, (outputLimit - outputAddress)));
+        }
+
+        // Process the entire input
+        int uncompressedSize = uncompressAll(
+                inputBase,
+                input,
+                inputLimit,
+                outputBase,
+                outputAddress,
+                outputLimit);
+
+        if (!(expectedLength == uncompressedSize)) {
+            throw new SnappyError(SnappyErrorCode.INVALID_CHUNK_SIZE, String.format("Recorded length is %s bytes but actual length after decompression is %s bytes ",
+                    expectedLength,
+                    uncompressedSize));
+        }
+
+        return expectedLength;
+    }
+
+    private static int uncompressAll(
+            final Object inputBase,
+            final long inputAddress,
+            final long inputLimit,
+            final Object outputBase,
+            final long outputAddress,
+            final long outputLimit)
+    {
+        final long fastOutputLimit = outputLimit - SIZE_OF_LONG; // maximum offset in output buffer to which it's safe to write long-at-a-time
+
+        long output = outputAddress;
+        long input = inputAddress;
+
+        while (input < inputLimit) {
+            int opCode = UNSAFE.getByte(inputBase, input++) & 0xFF;
+            int entry = opLookupTable[opCode] & 0xFFFF;
+
+            int trailerBytes = entry >>> 11;
+            int trailer = 0;
+            if (input + SIZE_OF_INT < inputLimit) {
+                trailer = UNSAFE.getInt(inputBase, input) & wordmask[trailerBytes];
+            }
+            else {
+                if (input + trailerBytes > inputLimit) {
+                    throw new SnappyError(SnappyErrorCode.PARSING_ERROR, String.format("position: %d", input - inputAddress));
+                }
+                switch (trailerBytes) {
+                    case 4:
+                        trailer = (UNSAFE.getByte(inputBase, input + 3) & 0xff) << 24;
+                    case 3:
+                        trailer |= (UNSAFE.getByte(inputBase, input + 2) & 0xff) << 16;
+                    case 2:
+                        trailer |= (UNSAFE.getByte(inputBase, input + 1) & 0xff) << 8;
+                    case 1:
+                        trailer |= (UNSAFE.getByte(inputBase, input) & 0xff);
+                }
+            }
+            if (trailer < 0) {
+                throw new SnappyError(SnappyErrorCode.PARSING_ERROR, String.format("position: %d", input - inputAddress));
+            }
+            input += trailerBytes;
+
+            int length = entry & 0xff;
+            if (length == 0) {
+                continue;
+            }
+
+            if ((opCode & 0x3) == LITERAL) {
+                int literalLength = length + trailer;
+
+                // copy literal
+                long literalOutputLimit = output + literalLength;
+                if (literalOutputLimit > fastOutputLimit || input + literalLength > inputLimit - SIZE_OF_LONG) {
+                    if (literalOutputLimit > outputLimit) {
+                        throw new SnappyError(SnappyErrorCode.PARSING_ERROR, String.format("position: %d", input - inputAddress));
+                    }
+
+                    // slow, precise copy
+                    UNSAFE.copyMemory(inputBase, input, outputBase, output, literalLength);
+                    input += literalLength;
+                    output += literalLength;
+                }
+                else {
+                    // fast copy. We may over-copy but there's enough room in input and output to not overrun them
+                    do {
+                        UNSAFE.putLong(outputBase, output, UNSAFE.getLong(inputBase, input));
+                        input += SIZE_OF_LONG;
+                        output += SIZE_OF_LONG;
+                    }
+                    while (output < literalOutputLimit);
+                    input -= (output - literalOutputLimit); // adjust index if we over-copied
+                    output = literalOutputLimit;
+                }
+            }
+            else {
+                // matchOffset/256 is encoded in bits 8..10.  By just fetching
+                // those bits, we get matchOffset (since the bit-field starts at
+                // bit 8).
+                int matchOffset = entry & 0x700;
+                matchOffset += trailer;
+
+                long matchAddress = output - matchOffset;
+                if (matchAddress < outputAddress || output + length > outputLimit) {
+                    throw new SnappyError(SnappyErrorCode.PARSING_ERROR, String.format("position: %d", input - inputAddress));
+                }
+                long matchOutputLimit = output + length;
+
+                if (output > fastOutputLimit) {
+                    // slow match copy
+                    while (output < matchOutputLimit) {
+                        UNSAFE.putByte(outputBase, output++, UNSAFE.getByte(outputBase, matchAddress++));
+                    }
+                }
+                else {
+                    // copy repeated sequence
+                    if (matchOffset < SIZE_OF_LONG) {
+                        // 8 bytes apart so that we can copy long-at-a-time below
+                        int increment32 = DEC_32_TABLE[matchOffset];
+                        int decrement64 = DEC_64_TABLE[matchOffset];
+
+                        UNSAFE.putByte(outputBase, output, UNSAFE.getByte(outputBase, matchAddress));
+                        UNSAFE.putByte(outputBase, output + 1, UNSAFE.getByte(outputBase, matchAddress + 1));
+                        UNSAFE.putByte(outputBase, output + 2, UNSAFE.getByte(outputBase, matchAddress + 2));
+                        UNSAFE.putByte(outputBase, output + 3, UNSAFE.getByte(outputBase, matchAddress + 3));
+                        output += SIZE_OF_INT;
+                        matchAddress += increment32;
+
+                        UNSAFE.putInt(outputBase, output, UNSAFE.getInt(outputBase, matchAddress));
+                        output += SIZE_OF_INT;
+                        matchAddress -= decrement64;
+                    }
+                    else {
+                        UNSAFE.putLong(outputBase, output, UNSAFE.getLong(outputBase, matchAddress));
+                        matchAddress += SIZE_OF_LONG;
+                        output += SIZE_OF_LONG;
+                    }
+
+                    if (matchOutputLimit > fastOutputLimit) {
+                        if (matchOutputLimit > outputLimit) {
+                            throw new SnappyError(SnappyErrorCode.PARSING_ERROR, String.format("position: %d", input - inputAddress));
+                        }
+
+                        while (output < fastOutputLimit) {
+                            UNSAFE.putLong(outputBase, output, UNSAFE.getLong(outputBase, matchAddress));
+                            matchAddress += SIZE_OF_LONG;
+                            output += SIZE_OF_LONG;
+                        }
+
+                        while (output < matchOutputLimit) {
+                            UNSAFE.putByte(outputBase, output++, UNSAFE.getByte(outputBase, matchAddress++));
+                        }
+                    }
+                    else {
+                        while (output < matchOutputLimit) {
+                            UNSAFE.putLong(outputBase, output, UNSAFE.getLong(outputBase, matchAddress));
+                            matchAddress += SIZE_OF_LONG;
+                            output += SIZE_OF_LONG;
+                        }
+                    }
+                }
+                output = matchOutputLimit; // correction in case we over-copied
+            }
+        }
+
+        return (int) (output - outputAddress);
+    }
+
+    // Mapping from i in range [0,4] to a mask to extract the bottom 8*i bits
+    private static final int[] wordmask = new int[] {
+            0, 0xff, 0xffff, 0xffffff, 0xffffffff
+    };
+
+    // Data stored per entry in lookup table:
+    //      Range   Bits-used       Description
+    //      ------------------------------------
+    //      1..64   0..7            Literal/copy length encoded in opcode byte
+    //      0..7    8..10           Copy offset encoded in opcode byte / 256
+    //      0..4    11..13          Extra bytes after opcode
+    //
+    // We use eight bits for the length even though 7 would have sufficed
+    // because of efficiency reasons:
+    //      (1) Extracting a byte is faster than a bit-field
+    //      (2) It properly aligns copy offset so we do not need a <<8
+    private static final short[] opLookupTable = new short[] {
+            0x0001, 0x0804, 0x1001, 0x2001, 0x0002, 0x0805, 0x1002, 0x2002,
+            0x0003, 0x0806, 0x1003, 0x2003, 0x0004, 0x0807, 0x1004, 0x2004,
+            0x0005, 0x0808, 0x1005, 0x2005, 0x0006, 0x0809, 0x1006, 0x2006,
+            0x0007, 0x080a, 0x1007, 0x2007, 0x0008, 0x080b, 0x1008, 0x2008,
+            0x0009, 0x0904, 0x1009, 0x2009, 0x000a, 0x0905, 0x100a, 0x200a,
+            0x000b, 0x0906, 0x100b, 0x200b, 0x000c, 0x0907, 0x100c, 0x200c,
+            0x000d, 0x0908, 0x100d, 0x200d, 0x000e, 0x0909, 0x100e, 0x200e,
+            0x000f, 0x090a, 0x100f, 0x200f, 0x0010, 0x090b, 0x1010, 0x2010,
+            0x0011, 0x0a04, 0x1011, 0x2011, 0x0012, 0x0a05, 0x1012, 0x2012,
+            0x0013, 0x0a06, 0x1013, 0x2013, 0x0014, 0x0a07, 0x1014, 0x2014,
+            0x0015, 0x0a08, 0x1015, 0x2015, 0x0016, 0x0a09, 0x1016, 0x2016,
+            0x0017, 0x0a0a, 0x1017, 0x2017, 0x0018, 0x0a0b, 0x1018, 0x2018,
+            0x0019, 0x0b04, 0x1019, 0x2019, 0x001a, 0x0b05, 0x101a, 0x201a,
+            0x001b, 0x0b06, 0x101b, 0x201b, 0x001c, 0x0b07, 0x101c, 0x201c,
+            0x001d, 0x0b08, 0x101d, 0x201d, 0x001e, 0x0b09, 0x101e, 0x201e,
+            0x001f, 0x0b0a, 0x101f, 0x201f, 0x0020, 0x0b0b, 0x1020, 0x2020,
+            0x0021, 0x0c04, 0x1021, 0x2021, 0x0022, 0x0c05, 0x1022, 0x2022,
+            0x0023, 0x0c06, 0x1023, 0x2023, 0x0024, 0x0c07, 0x1024, 0x2024,
+            0x0025, 0x0c08, 0x1025, 0x2025, 0x0026, 0x0c09, 0x1026, 0x2026,
+            0x0027, 0x0c0a, 0x1027, 0x2027, 0x0028, 0x0c0b, 0x1028, 0x2028,
+            0x0029, 0x0d04, 0x1029, 0x2029, 0x002a, 0x0d05, 0x102a, 0x202a,
+            0x002b, 0x0d06, 0x102b, 0x202b, 0x002c, 0x0d07, 0x102c, 0x202c,
+            0x002d, 0x0d08, 0x102d, 0x202d, 0x002e, 0x0d09, 0x102e, 0x202e,
+            0x002f, 0x0d0a, 0x102f, 0x202f, 0x0030, 0x0d0b, 0x1030, 0x2030,
+            0x0031, 0x0e04, 0x1031, 0x2031, 0x0032, 0x0e05, 0x1032, 0x2032,
+            0x0033, 0x0e06, 0x1033, 0x2033, 0x0034, 0x0e07, 0x1034, 0x2034,
+            0x0035, 0x0e08, 0x1035, 0x2035, 0x0036, 0x0e09, 0x1036, 0x2036,
+            0x0037, 0x0e0a, 0x1037, 0x2037, 0x0038, 0x0e0b, 0x1038, 0x2038,
+            0x0039, 0x0f04, 0x1039, 0x2039, 0x003a, 0x0f05, 0x103a, 0x203a,
+            0x003b, 0x0f06, 0x103b, 0x203b, 0x003c, 0x0f07, 0x103c, 0x203c,
+            0x0801, 0x0f08, 0x103d, 0x203d, 0x1001, 0x0f09, 0x103e, 0x203e,
+            0x1801, 0x0f0a, 0x103f, 0x203f, 0x2001, 0x0f0b, 0x1040, 0x2040
+    };
+
+    /**
+     * Reads the variable length integer encoded a the specified offset, and
+     * returns this length with the number of bytes read.
+     */
+    static int[] readUncompressedLength(Object compressed, long compressedAddress, long compressedLimit)
+    {
+        int result;
+        int bytesRead = 0;
+        {
+            int b = getUnsignedByteSafe(compressed, compressedAddress + bytesRead, compressedLimit);
+            bytesRead++;
+            result = b & 0x7f;
+            if ((b & 0x80) != 0) {
+                b = getUnsignedByteSafe(compressed, compressedAddress + bytesRead, compressedLimit);
+                bytesRead++;
+                result |= (b & 0x7f) << 7;
+                if ((b & 0x80) != 0) {
+                    b = getUnsignedByteSafe(compressed, compressedAddress + bytesRead, compressedLimit);
+                    bytesRead++;
+                    result |= (b & 0x7f) << 14;
+                    if ((b & 0x80) != 0) {
+                        b = getUnsignedByteSafe(compressed, compressedAddress + bytesRead, compressedLimit);
+                        bytesRead++;
+                        result |= (b & 0x7f) << 21;
+                        if ((b & 0x80) != 0) {
+                            b = getUnsignedByteSafe(compressed, compressedAddress + bytesRead, compressedLimit);
+                            bytesRead++;
+                            result |= (b & 0x7f) << 28;
+                            if ((b & 0x80) != 0) {
+                                throw new SnappyError(SnappyErrorCode.PARSING_ERROR, String.format("position: %d, error: %s", compressedAddress + bytesRead, "last byte of compressed length int has high bit set"));
+                            }
+                        }
+                    }
+                }
+            }
+        }
+        return new int[] {result, bytesRead};
+    }
+
+    private static int getUnsignedByteSafe(Object base, long address, long limit)
+    {
+        if (address >= limit) {
+            throw new SnappyError(SnappyErrorCode.PARSING_ERROR, String.format("position: %d, error: %s", limit - address, "Input is truncated"));
+        }
+        return UNSAFE.getByte(base, address) & 0xFF;
+    }
+}


=====================================
src/main/java/org/xerial/snappy/pure/UnsafeUtil.java
=====================================
@@ -0,0 +1,69 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.xerial.snappy.pure;
+
+import org.xerial.snappy.SnappyError;
+import org.xerial.snappy.SnappyErrorCode;
+import sun.misc.Unsafe;
+
+import java.lang.reflect.Field;
+import java.nio.Buffer;
+import java.nio.ByteOrder;
+
+import static java.lang.String.format;
+
+final class UnsafeUtil
+{
+    public static final Unsafe UNSAFE;
+    private static final Field ADDRESS_ACCESSOR;
+
+    private UnsafeUtil()
+    {
+    }
+
+    static {
+        ByteOrder order = ByteOrder.nativeOrder();
+        if (!order.equals(ByteOrder.LITTLE_ENDIAN)) {
+            throw new SnappyError(SnappyErrorCode.UNSUPPORTED_PLATFORM, format("pure-java snappy requires a little endian platform (found %s)", order));
+        }
+
+        try {
+            Field theUnsafe = Unsafe.class.getDeclaredField("theUnsafe");
+            theUnsafe.setAccessible(true);
+            UNSAFE = (Unsafe) theUnsafe.get(null);
+        }
+        catch (Exception e) {
+            throw new SnappyError(SnappyErrorCode.UNSUPPORTED_PLATFORM, "pure-java snappy requires access to sun.misc.Unsafe");
+        }
+
+        try {
+            Field field = Buffer.class.getDeclaredField("address");
+            field.setAccessible(true);
+            ADDRESS_ACCESSOR = field;
+        }
+        catch (Exception e) {
+            throw new SnappyError(SnappyErrorCode.UNSUPPORTED_PLATFORM, "pure-java snappy requires access to java.nio.Buffer raw address field");
+        }
+    }
+
+    public static long getAddress(Buffer buffer)
+    {
+        try {
+            return (long) ADDRESS_ACCESSOR.get(buffer);
+        }
+        catch (IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+}


=====================================
src/test/java/org/xerial/snappy/PureJavaSnappyInputStreamTest.java
=====================================
@@ -0,0 +1,25 @@
+package org.xerial.snappy;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+
+/**
+ *
+ */
+public class PureJavaSnappyInputStreamTest
+        extends SnappyInputStreamTest
+{
+    @BeforeClass
+    public static void setUp()
+            throws Exception
+    {
+        PureJavaSnappyTestUtil.setUp();
+    }
+
+    @AfterClass
+    public static void tearDown()
+            throws Exception
+    {
+        PureJavaSnappyTestUtil.tearDown();
+    }
+}


=====================================
src/test/java/org/xerial/snappy/PureJavaSnappyOutputStreamTest.java
=====================================
@@ -0,0 +1,25 @@
+package org.xerial.snappy;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+
+/**
+ *
+ */
+public class PureJavaSnappyOutputStreamTest
+        extends SnappyOutputStreamTest
+{
+    @BeforeClass
+    public static void setUp()
+            throws Exception
+    {
+        PureJavaSnappyTestUtil.setUp();
+    }
+
+    @AfterClass
+    public static void tearDown()
+            throws Exception
+    {
+        PureJavaSnappyTestUtil.tearDown();
+    }
+}


=====================================
src/test/java/org/xerial/snappy/PureJavaSnappyTest.java
=====================================
@@ -0,0 +1,25 @@
+package org.xerial.snappy;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+
+/**
+ *
+ */
+public class PureJavaSnappyTest
+        extends SnappyTest
+{
+    @BeforeClass
+    public static void setUp()
+            throws Exception
+    {
+        PureJavaSnappyTestUtil.setUp();
+    }
+
+    @AfterClass
+    public static void tearDown()
+            throws Exception
+    {
+        PureJavaSnappyTestUtil.tearDown();
+    }
+}


=====================================
src/test/java/org/xerial/snappy/PureJavaSnappyTestUtil.java
=====================================
@@ -0,0 +1,34 @@
+package org.xerial.snappy;
+
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.xerial.util.log.Logger;
+
+/**
+ *
+ */
+public abstract class PureJavaSnappyTestUtil
+{
+    private static Logger _logger = Logger.getLogger(PureJavaSnappyTestUtil.class);
+
+    @BeforeClass
+    public static void setUp()
+            throws Exception
+    {
+        _logger.info("Loading pure-java Snappy");
+        Snappy.cleanUp();
+        System.setProperty(SnappyLoader.KEY_SNAPPY_PUREJAVA, "true");
+        SnappyLoader.loadSnappyApi();
+    }
+
+    @AfterClass
+    public static void tearDown()
+            throws Exception
+    {
+        System.setProperty(SnappyLoader.KEY_SNAPPY_PUREJAVA, "false");
+        Snappy.cleanUp();
+        _logger.info("Unloading pure-java Snappy");
+        // Initialize Snappy again for the other tests
+        Snappy.init();
+    }
+}


=====================================
src/test/java/org/xerial/snappy/SnappyHadoopCompatibleOutputStreamTest.java
=====================================
@@ -8,6 +8,7 @@ import org.apache.hadoop.io.compress.SnappyCodec;
 import org.junit.AfterClass;
 import org.junit.Assert;
 import org.junit.BeforeClass;
+import org.junit.Ignore;
 import org.junit.Test;
 
 import java.io.*;
@@ -76,6 +77,7 @@ public class SnappyHadoopCompatibleOutputStreamTest
         FileUtils.deleteQuietly(tempNativeLibFolder);
     }
 
+    @Ignore("This test doesn't work with openjdk11 in GitHub Action")
     @Test
     public void testXerialCompressionHadoopDecompressionCodec() throws Exception
     {


=====================================
src/test/scala/org/xerial/snappy/SnappyPerformanceTest.scala
=====================================
@@ -5,7 +5,6 @@ import java.io.{ByteArrayOutputStream, ByteArrayInputStream}
 import scala.util.Random
 
 /**
-  *
   */
 class SnappyPerformanceTest extends SnappySpec {
 


=====================================
src/test/scala/org/xerial/snappy/SnappySpec.scala
=====================================
@@ -6,7 +6,6 @@ import wvlet.log.{LogSupport, Logger}
 import wvlet.log.io.Timer
 
 /**
-  *
   */
 trait SnappySpec extends WordSpec with Matchers with GivenWhenThen with OptionValues with BeforeAndAfter with Timer with LogSupport {
   Logger.setDefaultFormatter(SourceCodeLogFormatter)


=====================================
version.sbt
=====================================
@@ -1 +1 @@
-version in ThisBuild := "1.1.7.5"
+version in ThisBuild := "1.1.7.7"



View it on GitLab: https://salsa.debian.org/java-team/snappy-java/-/compare/e8aa6320319eb768de53d58191fa9479a6179281...68d85ea36adb00df0554acd6e2274db054e6f6bb

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