First commit

Author: AthBe1337

.gitignore

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+*.exe
+ncmdump
+
+.vscode
+.idea
+
+build
+
+cmake-build-*

.gitmodules

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+[submodule "taglib"]
+	path = taglib
+	url = https://github.com/taglib/taglib.git

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.14)
+
+set(CMAKE_CXX_STANDARD 20)
+set(CMAKE_CXX_STANDARD_REQUIRED ON)
+project(ncmdump_wasm CXX)
+
+set(CMAKE_POLICY_DEFAULT_CMP0077 NEW)
+set(WITH_ZLIB OFF)
+set(BUILD_TESTING OFF)
+
+add_subdirectory(taglib)
+
+FILE(GLOB COMMON_HEADERS src/include/*.h)
+FILE(GLOB COMMON_SOURCES src/ncmcrypt.cpp src/utils/*.cpp)
+FILE(GLOB LIBRARY_HEADERS src/lib/libncmdump.h)
+FILE(GLOB LIBRARY_SOURCES src/lib/*.cpp)
+
+# Emscripten 绑定接口的源文件
+set(WASM_INTERFACE_SOURCE src/wasm_interface.cpp)
+
+if(EMSCRIPTEN)
+  message(STATUS "Configuring WebAssembly build with Emscripten")
+
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O3")
+
+  add_executable(ncmdump_wasm
+          ${COMMON_SOURCES}
+          ${LIBRARY_SOURCES}
+          ${WASM_INTERFACE_SOURCE}
+  )
+
+  target_include_directories(ncmdump_wasm PRIVATE
+          src/include
+          taglib
+          taglib/taglib
+          taglib/taglib/toolkit
+          taglib/taglib/mpeg/id3v2
+  )
+
+  target_link_libraries(ncmdump_wasm tag)
+
+  set_target_properties(ncmdump_wasm PROPERTIES OUTPUT_NAME "ncmdump")
+
+  target_compile_options(ncmdump_wasm PRIVATE
+          -frtti        # 启用运行时类型信息
+          -fexceptions  # 启用 C++ 异常
+  )
+
+  target_link_options(ncmdump_wasm PRIVATE
+          --bind
+          -sMODULARIZE=1
+          -sEXPORT_NAME="createNCMDumpModule"
+          -sEXPORT_ES6=1
+          -sUSE_ES6_IMPORT_META=1
+          -sENVIRONMENT=web
+          -sALLOW_MEMORY_GROWTH=1
+          -sEXIT_RUNTIME=0
+          #-sASSERTIONS=1
+          -sNO_DISABLE_EXCEPTION_CATCHING
+  )
+
+  install(TARGETS ncmdump_wasm
+          RUNTIME DESTINATION wasm
+          LIBRARY DESTINATION wasm
+          ARCHIVE DESTINATION wasm
+  )
+endif()

README.md

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+```bash
+emcmake cmake .. -DCMAKE_BUILD_TYPE=Release
+emmake make -j$nproc
+```
+

decrypt.worker.js

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+import createModule from './wasm/ncmdump.js';
+
+let wasmModule = null;
+let isWasmReady = false;
+
+createModule({
+    locateFile: (path) => path.endsWith('.wasm') ? './wasm/ncmdump.wasm' : path,
+    onRuntimeInitialized: function() {
+        wasmModule = this;
+        isWasmReady = true;
+        self.postMessage({ type: 'wasm-ready' });
+    }
+}).catch(err => {
+    self.postMessage({
+        type: 'error',
+        error: `WASM加载失败: ${err.message}`
+    });
+});
+
+self.onmessage = async (e) => {
+    const { type, payload } = e.data;
+
+    if (type === 'decrypt') {
+        try {
+            if (!isWasmReady) {
+                throw new Error("WASM模块尚未初始化完成");
+            }
+
+            const fileData = new Uint8Array(payload.fileData);
+            const baseName = payload.baseNameWithoutExtension || "output";
+
+            const resultView = wasmModule.decryptNCM(fileData, baseName);
+
+            const result = new Uint8Array(resultView.length);
+            result.set(resultView);
+
+            self.postMessage({
+                type: 'decrypted',
+                payload: {
+                    index: payload.index,
+                    result: result.buffer
+                }
+            }, [result.buffer]);
+
+        } catch (error) {
+            self.postMessage({
+                type: 'error',
+                payload: {
+                    index: payload.index,
+                    error: error.message
+                }
+            });
+        }
+    }
+};