Initial commit

.gitignore

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+.gradle
+.idea
+build/

README.md

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+# Genshin Audio Unpacker
+
+*Thanks to [MeguminSama project](https://github.com/MeguminSama/genshin-audio-extractor) which has been a huge source of
+inspiration for this.*
+
+## Why ?
+
+This project has been made to extract music file from the game Genshin Impact.
+
+Although [genshin-audio-extractor](https://github.com/MeguminSama/genshin-audio-extractor) supports it very well, I
+wanted to work on my own version for the challenge and to add few features.
+
+**This program will only process Minimum.pck and Music\*.pck files**
+
+## Ok, but still, why ?
+
+Since 2.5, Mihoyo decided to change the way update are downloaded. Instead of downloading a whole package with all
+updated PCK files, they work with `hdiff` files which only update part of the current game files.
+
+This is cleaner, smarter and reduces a lot the download size.
+
+Although, I was using another audio extractor at the time to extract music from the update package, this was now
+impossible with `hdiff` files, so I wrote this program which allow me to patch current game file and extract new musics.
+
+## How to use it
+
+From the `--help` output:
+
+```
+Usage: [-dhpV] -g=<genshinFolder> [-t=<threadCount>]
+  -d, --diff      Extract update package only
+  -g, --genshin=<genshinFolder>
+                  Installation folder of the game
+  -h, --help      Show this help message and exit.
+  -p, --prefix    (With --diff) Add status prefix to files
+  -t, --threads=<threadCount>
+                  Number of parallel thread that can be used.
+  -V, --version   Print version information and exit.
+```
+
+> Please note that the Genshin Impact directory must be where the game and launcher are installed, not only the game
+
+e.g.: `D:\Program Files\Genshin Impact` not `D:\Program Files\Genshin Impact\Genshin Impact Game`
+
+### Examples
+
+If you want to extract music from the current version of the game:
+
+```bash
+java -jar <whateverTheName>.jar --genshin="D:\Program Files\Genshin Impact"
+```
+
+If you want to extract music from the update package (once the download though the launcher is finished):
+
+```bash
+java -jar <whateverTheName>.jar --genshin="D:\Program Files\Genshin Impact" --diff
+```
+
+The previous command will leave a lot of file, both created and updated... If you want to know which one has been
+create/update, add the `--prefix` flag:
+
+```
+java -jar <whateverTheName>.jar --genshin="D:\Program Files\Genshin Impact" --diff --prefix
+```
+
+Every file will now have a prefix:
+
+- **[C]**: The file has been created with this update
+- **[U]**: The file has been updated with this update
+    - *You most likely already heard it, but you can check just in case*
+- **[D]**: The file has never been seen, but is very similar to an already existing one within the game.
+    - *This happens way more often than you think...*
+
+### Feature Requests, Bug Report
+
+I might not look too much on feature requests, but surely on bug reports. Though for features, I'm open to PR, just open
+an issue beforehand to talk about it.
+
+### External Programs
+
+- **QuickBMS:** Used to unpack PCK files to WEM files
+- **VGMStream:** Used to convert WEM files to WAV files
+- **hdiffpatch:** Used to patch PCK files with the `hdiff` files in the update package
+

build.gradle

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+plugins {
+    id 'java'
+}
+
+group 'ovh.akio'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+jar {
+    manifest {
+        attributes "Main-Class": "ovh.akio.genshin.Application"
+    }
+
+    from {
+        configurations.runtimeClasspath.collect { it.isDirectory() ? it : zipTree(it) }
+    }
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+
+    implementation group: 'info.picocli', name: 'picocli', version: '4.6.3'
+    implementation group: 'me.tongfei', name: 'progressbar', version: '0.9.3'
+}
+
+test {
+    useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-7.2-bin.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# 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
+#
+#      https://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.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MSYS* | MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"