This repository contains a WebAssembly build of the UnRAR source with a minimal C API for listing and extracting RAR archives in browser and worker environments.

• unrar/ — upstream UnRAR source with a CMake build for WASM
• unrar/wasm/unrar_wasm.cpp — thin C API wrapper
• build/unrar.js and build/unrar.wasm — generated WASM artifacts

Prerequisites:

• Emscripten installed (emcmake on PATH)
• CMake 3.16+

Build:

emcmake cmake -S unrar -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build -j

The WASM module exports two C functions:

• rar_list(archivePath, listPath)
  • Writes a newline-separated file list to listPath
  • Returns number of files on success or a negative error code
• rar_extract_all(archivePath, outDir)
  • Extracts all files into outDir
  • Returns number of files on success or a negative error code

importScripts('unrar.js');

const Module = await createUnrarModule({
  locateFile: (p) => new URL(p, self.location.href).toString()
});

Module.FS.mkdir('/work');
Module.FS.writeFile('/work/archive.rar', new Uint8Array(buf));

const listRes = Module.ccall('rar_list', 'number', ['string', 'string'], [
  '/work/archive.rar',
  '/work/list.txt'
]);

Module.FS.mkdir('/out');
const extractRes = Module.ccall('rar_extract_all', 'number', ['string', 'string'], [
  '/work/archive.rar',
  '/out'
]);

• Built with ALLOW_MEMORY_GROWTH=1 and MAXIMUM_MEMORY=2GB.
• Output is suitable for web and worker use (no Node target).

Built from UnRAR source snapshot copied into this repo on 2026-04-07.

UnRAR source: https://www.rarlab.com/rar/unrarsrc-7.2.1.tar.gz

UnRAR is distributed under the UnRAR license. See the upstream license.txt in the source tree for full terms. *** End Patch去了