feat: allow sepecify output dir; process dir recursively

use cxxopts library to parse command line options

example/csharp/NeteaseCrypt.cs

@@ -14,7 +14,7 @@ namespace libncmdump_demo_cli
         private static extern IntPtr CreateNeteaseCrypt(IntPtr path);
 
         [DllImport(DLL_PATH, CallingConvention = CallingConvention.Cdecl)]
-        private static extern int Dump(IntPtr NeteaseCrypt);
+        private static extern int Dump(IntPtr NeteaseCrypt, IntPtr outputPath);
 
         [DllImport(DLL_PATH, CallingConvention = CallingConvention.Cdecl)]
         private static extern void FixMetadata(IntPtr NeteaseCrypt);
@@ -42,10 +42,17 @@ namespace libncmdump_demo_cli
         /// <summary>
         /// 启动转换过程。
         /// </summary>
+        /// <param name="OutputPath">指定一个路径输出，如果为空，则输出到原路径</param>
         /// <returns>返回一个整数，指示转储过程的结果。如果成功，返回0；如果失败，返回1。</returns>
-        public int Dump()
+        public int Dump(string OutputPath)
         {
-            return Dump(NeteaseCryptClass);
+            byte[] bytes = Encoding.UTF8.GetBytes(OutputPath);
+
+            IntPtr outputPtr = Marshal.AllocHGlobal(bytes.Length + 1);
+            Marshal.Copy(bytes, 0, outputPtr, bytes.Length);
+            Marshal.WriteByte(outputPtr, bytes.Length, 0);
+
+            return Dump(NeteaseCryptClass, outputPtr);
         }
 
         /// <summary>

example/csharp/Program.cs

@@ -14,7 +14,7 @@ namespace libncmdump_demo_cli
             NeteaseCrypt neteaseCrypt = new NeteaseCrypt(filePath);
 
             // 启动转换过程
-            int result = neteaseCrypt.Dump();
+            int result = neteaseCrypt.Dump("");  // 为空则输出到源
 
             // 修复元数据
             neteaseCrypt.FixMetadata();

src/include/ncmcrypt.h

@@ -66,6 +66,6 @@ public:
 	~NeteaseCrypt();
 
 public:
-	void Dump();
+	void Dump(std::string const&);
 	void FixMetadata();
 };

src/include/version.h

@@ -0,0 +1,3 @@
+#define VERSION_MAJOR 1
+#define VERSION_MINOR 5
+#define VERSION_PATCH 0

src/lib/libncmdump.cpp

@@ -9,10 +9,10 @@ extern "C" {
         return new NeteaseCrypt(fPath.u8string());
     }
 
-    API int Dump(NeteaseCrypt* neteaseCrypt) {
+    API int Dump(NeteaseCrypt* neteaseCrypt, const char* outputPath) {
         try
         {
-            neteaseCrypt->Dump();
+            neteaseCrypt->Dump(outputPath);
         }
         catch (const std::invalid_argument& e)
         {

src/lib/libncmdump.h

@@ -8,7 +8,7 @@
 
 extern "C" {
     API NeteaseCrypt* CreateNeteaseCrypt(const char* path);
-    API int Dump(NeteaseCrypt* neteaseCrypt);
+    API int Dump(NeteaseCrypt* neteaseCrypt, const char* outputPath);
     API void FixMetadata(NeteaseCrypt* neteaseCrypt);
     API void DestroyNeteaseCrypt(NeteaseCrypt* neteaseCrypt);
 }

src/main.cpp

@@ -10,115 +10,190 @@
 #endif
 
 #include "color.h"
+#include "version.h"
+#include "cxxopts.hpp"
 
 namespace fs = std::filesystem;
 
-void displayHelp()
+void processFile(const fs::path &filePath, const fs::path &outputFolder)
-{
-    std::cout << "Usage: ncmdump [-d] [-h] file1 file2 ..." << std::endl;
-    std::cout << "Options:" << std::endl;
-    std::cout << "  -d               Process files in a folder (requires folder path)" << std::endl;
-    std::cout << "  -h, --help       Display this help message" << std::endl;
-}
-
-void processFile(const fs::path &filePath)
 {
     if (fs::exists(filePath) == false)
     {
-        std::cerr << BOLDRED << "Error: " << RESET << "file '" << filePath.u8string() << "' does not exist." << std::endl;
+        std::cerr << BOLDRED << "[Error] " << RESET << "file '" << filePath.u8string() << "' does not exist." << std::endl;
+        return;
+    }
+
+    // skip if not ending with ".ncm"
+    if (!filePath.has_extension() || filePath.extension().u8string()!= ".ncm")
+    {
         return;
     }
 
     try
     {
         NeteaseCrypt crypt(filePath.u8string());
-        crypt.Dump();
+        crypt.Dump(outputFolder.u8string());
         crypt.FixMetadata();
 
         std::cout << BOLDGREEN << "[Done] " << RESET << "'" << filePath.u8string() << "' -> '" << crypt.dumpFilepath().u8string() << "'" << std::endl;
     }
     catch (const std::invalid_argument &e)
     {
-        std::cerr << BOLDRED << "Exception: " << RESET << RED << e.what() << RESET << " '" << filePath.u8string() << "'" << std::endl;
+        std::cerr << BOLDRED << "[Exception] " << RESET << RED << e.what() << RESET << " '" << filePath.u8string() << "'" << std::endl;
     }
     catch (...)
     {
-        std::cerr << BOLDRED << "Unexpected exception while processing file: " << RESET << filePath.u8string() << std::endl;
+        std::cerr << BOLDRED << "[Error] Unexpected exception while processing file: " << RESET << filePath.u8string() << std::endl;
-    }
-}
-
-void processFilesInFolder(const fs::path &folderPath)
-{
-    for (const auto &entry : fs::directory_iterator(folderPath))
-    {
-        if (fs::is_regular_file(entry.status()))
-        {
-            processFile(entry.path());
-        }
     }
 }
 
 int main(int argc, char **argv)
 {
 #if defined(_WIN32)
-    win32_utf8argv(&argc, &argv);
+    win32_utf8argv(&argc, &argv); // Convert command line arguments to UTF-8 under Windows
 #endif
-    if (argc <= 1)
+
+    cxxopts::Options options("ncmdump");
+
+    options.add_options()
+    ("h,help", "Print usage")
+    ("d,directory", "Process files in a folder (requires folder path)", cxxopts::value<std::string>())
+    ("r,recursive", "Process files recursively (requires -d option)", cxxopts::value<bool>()->default_value("false"))
+    ("o,output", "Output folder (default: original file folder)", cxxopts::value<std::string>())
+    ("v,version", "Print version information", cxxopts::value<bool>()->default_value("false"))
+    ("filenames", "Input files", cxxopts::value<std::vector<std::string>>());
+
+    options.parse_positional({"filenames"});
+
+    // Parse options the usual way
+    auto result = options.parse(argc, argv);
+
+    // display help message
+    if (result.count("help"))
     {
-        displayHelp();
+        std::cout << options.help() << std::endl;
+        return 0;
+    }
+
+    // display version information
+    if (result.count("version"))
+    {
+        std::cout << "ncmdump version " << VERSION_MAJOR << "." << VERSION_MINOR << "." << VERSION_PATCH << std::endl;
+        return 0;
+    }
+
+    // no input files or folder provided
+    if (result.count("directory") == 0 && result.count("filenames") == 0)
+    {
+        std::cout << options.help() << std::endl;
         return 1;
     }
 
-    std::vector<fs::path> files;
+    // only -r option without -d option
-    bool processFolders = false;
+    if (result.count("recursive") && result.count("directory") == 0)
-
-    bool folderProvided = false;
-
-#define COMPARE_STR(s1, s2) (strcmp(s1, s2) == 0)
-#define HELP_SHORT "-h"
-#define HELP_LONG "--help"
-#define PROCESS_FOLDER "-d"
-    for (int i = 1; i < argc; ++i)
     {
-        if (COMPARE_STR(argv[i], HELP_SHORT) || COMPARE_STR(argv[i], HELP_LONG))
+        std::cerr << BOLDRED << "[Error] " << RESET << "-r option requires -d option." << std::endl;
+        return 1;
+    }
+
+    // check output folder
+    fs::path outputDir = fs::u8path("");
+    bool outputDirSpecified = result.count("output") > 0;
+
+    if (outputDirSpecified)
+    {
+        outputDir = fs::u8path(result["output"].as<std::string>());
+        if (fs::exists(outputDir))
         {
-            displayHelp();
+            if (!fs::is_directory(outputDir))
-            return 0;
-        }
-        else if (COMPARE_STR(argv[i], PROCESS_FOLDER))
-        {
-            processFolders = true;
-            if (i + 1 < argc && argv[i + 1][0] != '-')
             {
-                folderProvided = true;
+                std::cerr << BOLDRED << "[Error] " << RESET << "'" << outputDir.u8string() << "' is not a valid directory." << std::endl;
-                processFilesInFolder(fs::u8path(argv[i + 1]));
-                // Skip the folder name
-                ++i;
-            }
-            else
-            {
-                std::cerr << "Error: -d option requires a folder path." << std::endl;
                 return 1;
             }
         }
-        else
+        fs::create_directories(outputDir);
-        {
-            fs::path path = fs::u8path(argv[i]);
-            files.push_back(path);
-        }
     }
 
-    for (const auto &file : files)
+    // process files in a folder
+    if (result.count("directory"))
     {
-        if (processFolders && fs::is_directory(file))
+        fs::path sourceDir = fs::u8path(result["directory"].as<std::string>());
+        if (!fs::is_directory(sourceDir))
         {
-            processFilesInFolder(file);
+            std::cerr << BOLDRED << "[Error] " << RESET << "'" << sourceDir.u8string() << "' is not a valid directory." << std::endl;
+            return 1;
+        }
+
+        bool recursive = result["recursive"].as<bool>();
+
+        if (recursive)
+        {
+            // 递归遍历源目录
+            for (const auto &entry : fs::recursive_directory_iterator(sourceDir))
+            {
+                // 没有指定输出目录，则使用源目录作为输出目录
+                if (!outputDirSpecified)
+                {
+                    outputDir = sourceDir;
+                }
+
+                // 获得递归遍历的相对路径
+                const auto &path = fs::u8path(entry.path().u8string());
+                auto relativePath = fs::relative(path, sourceDir);
+                fs::path destinationPath = outputDir / relativePath;
+
+                if (fs::is_regular_file(path))
+                {
+                    // 确保输出文件的目录存在
+                    fs::create_directories(destinationPath.parent_path());
+
+                    // 处理文件
+                    processFile(path, destinationPath.parent_path());
+                }
+            }
         }
         else
         {
-            processFile(file);
+            for (const auto &entry : fs::directory_iterator(sourceDir))
+            {
+                const auto &path = fs::u8path(entry.path().u8string());
+                if (entry.is_regular_file())
+                {
+                    if (outputDirSpecified)
+                    {
+                        processFile(path, outputDir);
+                    }
+                    else
+                    {
+                        processFile(path, "");
+                    }
+                }
+            }
         }
+        return 0;
     }
 
+    // process individual files
+    if (result.count("filenames"))
+    {
+        for (const auto &filePath : result["filenames"].as<std::vector<std::string>>())
+        {
+            fs::path filePathU8 = fs::u8path(filePath);
+            if (!fs::is_regular_file(filePathU8))
+            {
+                std::cerr << BOLDRED << "[Error] " << RESET << "'" << filePathU8.u8string() << "' is not a valid file." << std::endl;
+                continue;
+            }
+
+            if (outputDirSpecified)
+            {
+                processFile(filePathU8, outputDir);
+            }
+            else
+            {
+                processFile(filePathU8, "");
+            }
+        }
+    }
     return 0;
 }

src/ncmcrypt.cpp

@@ -16,6 +16,9 @@
 #include <string>
 #include <filesystem>
 
+#pragma warning(disable:4267)
+#pragma warning(disable:4244)
+
 const unsigned char NeteaseCrypt::sCoreKey[17] = {0x68, 0x7A, 0x48, 0x52, 0x41, 0x6D, 0x73, 0x6F, 0x35, 0x6B, 0x49, 0x6E, 0x62, 0x61, 0x78, 0x57, 0};
 const unsigned char NeteaseCrypt::sModifyKey[17] = {0x23, 0x31, 0x34, 0x6C, 0x6A, 0x6B, 0x5F, 0x21, 0x5C, 0x5D, 0x26, 0x30, 0x55, 0x3C, 0x27, 0x28, 0};
 
@@ -260,9 +263,14 @@ void NeteaseCrypt::FixMetadata()
     audioFile->~File();
 }
 
-void NeteaseCrypt::Dump()
+void NeteaseCrypt::Dump(std::string const &outputDir = "")
 {
-    mDumpFilepath = std::filesystem::u8path(mFilepath);
+    if (outputDir.empty())
+    {
+        mDumpFilepath = std::filesystem::u8path(mFilepath);
+    } else {
+        mDumpFilepath = std::filesystem::u8path(outputDir) / std::filesystem::u8path(mFilepath).filename();
+    }
 
     std::vector<unsigned char> buffer(0x8000);