# rapt **Repository Path**: testsipclone/rapt ## Basic Information - **Project Name**: rapt - **Description**: No description available - **Primary Language**: Unknown - **License**: Not specified - **Default Branch**: master - **Homepage**: None - **GVP Project**: No ## Statistics - **Stars**: 0 - **Forks**: 0 - **Created**: 2025-08-08 - **Last Updated**: 2025-08-08 ## Categories & Tags **Categories**: Uncategorized **Tags**: None ## README # Rust with AAPT > AAPT2 (Android Asset Packaging Tool) ## Crunch Images Android Libs: - libpng 是官方的便携式网络图形参考库。它是一个独立于平台的库，其中包含用于处理PNG图像的C函数。它支持几乎所有PNG的功能，并且是可扩展的，并且已经被广泛使用和测试了超过23年。libpng依赖zlib进行数据压缩和解压缩例程。 - zlib 是提供数据压缩之用的库，由Jean-loup Gailly与Mark Adler所开发，初版0.9版在1995年5月1日发表。zlib使用抽象化的DEFLATE算法，最初是为libpng库所写的，后来普遍为许多软件所使用。 其它压缩库： - Pngrewrite is command-line utility that reduces the unnecessarily large palettes that some programs write into PNG files. - pngcrush 是一个免费的开源命令行实用程序，用于优化PNG图像文件。它会无损地减小文件的大小-也就是说，生成的“压缩”图像将具有与源图像相同的质量。pngcrush的主要目的是通过尝试各种压缩方法和增量过滤器的组合来减小PNG IDAT数据流的大小。 - optipng 是一个PNG优化器，可将图像文件重新压缩为更小尺寸，而不会丢失任何信息。 - pngout 算法： - [pngquant](https://pngquant.org/) 是一个命令行工具和一个用于有损压缩PNG图像的库。 转换显着减少文件大小（通常高达70％），并保留完整的alpha透明度。 - Zopfli 是一个数据压缩算法，可以将数据压缩为 DEFLATE、gzip 或 zli b格式。Zopfli 被认为是当前压缩率最高的 DEFLATE 压缩算法。 PNG 压缩算法： - [Color quantization](https://en.wikipedia.org/wiki/Color_quantization) - [Indexed color](https://en.wikipedia.org/wiki/Indexed_color) Documents: - [优化包大小-PNG部分](https://juejin.im/post/5de77f37e51d45583317d73a) - [关于Android图片资源瘦身的奇思妙想](https://cloud.tencent.com/developer/article/1004331) 演示：Pngout - [pngquant with rust](https://pngquant.org/install.html) Rust Library: - [Citrus](https://gitlab.com/citrus-rs/citrus) is a tool that helps convert C programs to Rust programs. It transforms C syntax to Rust syntax, but ignores C semantics. - [LodePNG](https://github.com/kornelski/lodepng-rust) is a pure Rust PNG image decoder and encoder. Allows easy reading and writing of PNG files without any system dependencies. - [Oxipng](https://github.com/shssoichiro/oxipng) is a multithreaded lossless PNG compression optimizer. It can be used via a command-line interface or as a library in other Rust programs. Benchmark - [RGBA Structural Similarity](https://github.com/kornelski/dssim) Image similarity comparison simulating human perception (multiscale SSIM in Rust) 9Patch -> NinePatch -> 九宫格 ## Notes ### AAPT2 aapt2将原先的资源编译打包过程拆分成了两部分，即编译和链接。 - 编译：将资源文件编译为二进制格式文件 - 链接：将编译后的所有文件合并，打包成一个单独文件 #### Format ### Format The file starts with a simple header. All multi-byte fields are little-endian. | Size (in bytes) | Field | Description | |:----------------|:--------------|:-----------------------------------------------------| | `4` | `magic` | The magic bytes must equal `'AAPT'` or `0x54504141`. | | `4` | `version` | The version of the container format. | | `4` | `entry_count` | The number of entries in this container. | This is followed by `entry_count` of the following data structure. It must be aligned on a 32-bit boundary, so if a previous entry ends unaligned, padding must be inserted. | Size (in bytes) | Field | Description | |:----------------|:---------------|:----------------------------------------------------------------------------------------------------------| | `4` | `entry_type` | The type of the entry. This can be one of two types: `RES_TABLE (0x00000000)` or `RES_FILE (0x00000001)`. | | `8` | `entry_length` | The length of the data that follows. Do not use if `entry_type` is `RES_FILE`; this value may be wrong. | | `entry_length` | `data` | The payload. The contents of this varies based on the `entry_type`. | If the `entry_type` is equal to `RES_TABLE (0x00000000)`, the `data` field contains a serialized [aapt.pb.ResourceTable](Resources.proto). If the `entry_type` is equal to `RES_FILE (0x00000001)`, the `data` field contains the following: | Size (in bytes) | Field | Description | |:----------------|:-----------------|:----------------------------------------------------------------------------------------------------------| | `4` | `header_size` | The size of the `header` field. | | `8` | `data_size` | The size of the `data` field. | | `header_size` | `header` | The serialized Protobuf message [aapt.pb.internal.CompiledFile](ResourcesInternal.proto). | | `x` | `header_padding` | Up to 3 bytes of zeros, if padding is necessary to align the `data` field on a 32-bit boundary. | | `data_size` | `data` | The payload, which is determined by the `type` field in the `aapt.pb.internal.CompiledFile`. This can be a PNG file, binary XML, or [aapt.pb.XmlNode](Resources.proto). | | `y` | `data_padding` | Up to 3 bytes of zeros, if `data_size` is not a multiple of 4. | ### Android AAPT Compile config libs: ``` "libandroidfw", "libutils", "liblog", "libcutils", "libexpat", "libziparchive", "libpng", "libbase", "libprotobuf-cpp-lite", "libz", "libbuildversion", ``` ### Readable ``` FIND_PACKAGE(JAVA REQUIRED) INCLUDE_DIRECTORIES(${JAVA_INCLUDE_DIRS}) LINK_DIRECTORIES(${JAVA_LIBRARY_DIRS}) #FIND_PACKAGE(JNI REQUIRED) #INCLUDE(UseJava) INCLUDE_DIRECTORIES(~/studio-master-dev/prebuilts/studio/jdk/mac/Contents/Home/include/darwin) INCLUDE_DIRECTORIES(~/studio-master-dev/prebuilts/studio/jdk/mac/Contents/Home/include) LINK_DIRECTORIES(~/studio-master-dev/prebuilts/studio/jdk/mac/Contents/Home) INCLUDE_DIRECTORIES(~/studio-master-dev/external/libpng/include) LINK_DIRECTORIES(~/studio-master-dev/external/libpng) INCLUDE_DIRECTORIES(~/frameworks/base/libs/androidfw/include) LINK_DIRECTORIES(~/frameworks/base/libs/androidfw) INCLUDE_DIRECTORIES(~/system/core/include) LINK_DIRECTORIES(~/frameworks/base/libs) INCLUDE_DIRECTORIES(~/system/libbase/include) LINK_DIRECTORIES(~/system/libbase) INCLUDE_DIRECTORIES(~/studio-master-dev/external/googletest/googlemock/include) LINK_DIRECTORIES(~/studio-master-dev/external/googlemock) INCLUDE_DIRECTORIES(~/studio-master-dev/external/googletest/googletest/include) LINK_DIRECTORIES(~/studio-master-dev/external/googletest) INCLUDE_DIRECTORIES(~/frameworks/native/include) LINK_DIRECTORIES(~/frameworks/native) INCLUDE_DIRECTORIES(~/system/libziparchive/include) LINK_DIRECTORIES(~/system/libziparchive) FIND_PACKAGE(PROTOBUF REQUIRED) INCLUDE_DIRECTORIES(${PROTOBUF_INCLUDE_DIRS}) LINK_DIRECTORIES(${PROTOBUF_LIBRARY_DIRS}) ADD_DEFINITIONS(${PROTOBUF_DEFINITIONS}) ``` add `build/version.h` ```c++ #ifndef BUILD_VERSION_H #define BUILD_VERSION_H #include namespace android { namespace build { std::string GetBuildNumber(); } // namespace build } // namespace android #endif // BUILD_VERSION_H ``` ### Compilable [MacOS X 编译Android源码](https://juejin.im/post/5b690cb46fb9a04fd044885d) [https://android.googlesource.com/platform/build/soong/](https://android.googlesource.com/platform/build/soong/) [Android 镜像使用帮助](https://mirror.tuna.tsinghua.edu.cn/help/AOSP/) ``` mkdir ~/bin PATH=~/bin:$PATH curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo chmod a+x ~/bin/repo ``` ``` wget -c https://mirrors.tuna.tsinghua.edu.cn/aosp-monthly/aosp-latest.tar # 下载初始化包 tar xf aosp-latest.tar cd AOSP # 解压得到的 AOSP 工程目录 # 这时 ls 的话什么也看不到，因为只有一个隐藏的 .repo 目录 repo sync # 正常同步一遍即可得到完整目录 # 或 repo sync -l 仅checkout代码 ``` #### Mount [Establishing a Build Environment](https://source.android.com/setup/build/initializing) resize: ```bash hdiutil resize -size g ~/android.dmg.sparseimage ``` mount ```bash hdiutil attach ~/android.dmg.sparseimage -mountpoint /Volumes/android; ``` unmount ```bash hdiutil detach /Volumes/android; ``` bash ```bash mountAndroid() { hdiutil attach ~/android.dmg.sparseimage -mountpoint /Volumes/android; } umountAndroid() { hdiutil detach /Volumes/android; } ``` ## Development CLION import [CLion project generator](https://android.googlesource.com/platform/build/soong/+/HEAD/docs/clion.md) ``` $ export SOONG_GEN_CMAKEFILES=1 $ export SOONG_GEN_CMAKEFILES_DEBUG=1 # all $ make -j64 # some $ make frameworks/native/service/libs/ui ``` ### Proto ``` brew cask install protobuf ``` ```bash cargo install protobuf-codegen ``` ### Compile AAPT [如何在不影响原有aapt源码的情况下编译定制版aapt](https://blog.csdn.net/sbsujjbcy/article/details/51418336) [如何在Majove下编译aapt2](https://www.jianshu.com/p/03576605f436) ### Related [Atlas AAPT](https://github.com/alibaba/atlas/tree/master/atlas-aapt) ### reversing engine - [androguard](https://github.com/vivainio/androguard) - [ClassyShark](https://github.com/google/android-classyshark) - [Radare](https://www.radare.org/r/) [浅析 Android 打包流程](https://mp.weixin.qq.com/s?__biz=MzI0NjIzNDkwOA==&mid=2247483789&idx=1&sn=6aed8c7907d5bd9c8a5e7f2c2dcdac2e&scene=0#wechat_redirect) ### Analyzer [Android Size Analyzer](https://github.com/android/size-analyzer)