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https://github.com/Lime3DS/Lime3DS.git
synced 2024-11-23 18:19:21 +01:00
Loader: Guess filetype from the magic, or fallback to the extension.
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@ -44,7 +44,6 @@ enum THREEDSX_Error {
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static const u32 RELOCBUFSIZE = 512;
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// File header
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static const u32 THREEDSX_MAGIC = 0x58534433; // '3DSX'
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#pragma pack(1)
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struct THREEDSX_Header
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{
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@ -202,6 +201,18 @@ static THREEDSX_Error Load3DSXFile(FileUtil::IOFile& file, u32 base_addr)
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return ERROR_NONE;
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}
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FileType AppLoader_THREEDSX::IdentifyType(FileUtil::IOFile& file) {
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u32 magic;
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file.Seek(0, SEEK_SET);
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if (1 != file.ReadArray<u32>(&magic, 1))
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return FileType::Error;
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if (MakeMagic('3', 'D', 'S', 'X') == magic)
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return FileType::THREEDSX;
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return FileType::Error;
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}
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ResultStatus AppLoader_THREEDSX::Load() {
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if (is_loaded)
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return ResultStatus::ErrorAlreadyLoaded;
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@ -17,6 +17,13 @@ class AppLoader_THREEDSX final : public AppLoader {
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public:
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AppLoader_THREEDSX(std::unique_ptr<FileUtil::IOFile>&& file) : AppLoader(std::move(file)) { }
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/**
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* Returns the type of the file
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* @param file FileUtil::IOFile open file
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* @return FileType found, or FileType::Error if this loader doesn't know it
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*/
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static FileType IdentifyType(FileUtil::IOFile& file);
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/**
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* Load the bootable file
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* @return ResultStatus result of function
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@ -330,6 +330,18 @@ bool ElfReader::LoadSymbols() {
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namespace Loader {
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FileType AppLoader_ELF::IdentifyType(FileUtil::IOFile& file) {
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u32 magic;
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file.Seek(0, SEEK_SET);
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if (1 != file.ReadArray<u32>(&magic, 1))
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return FileType::Error;
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if (MakeMagic('\x7f', 'E', 'L', 'F') == magic)
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return FileType::ELF;
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return FileType::Error;
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}
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ResultStatus AppLoader_ELF::Load() {
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if (is_loaded)
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return ResultStatus::ErrorAlreadyLoaded;
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@ -17,6 +17,13 @@ class AppLoader_ELF final : public AppLoader {
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public:
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AppLoader_ELF(std::unique_ptr<FileUtil::IOFile>&& file) : AppLoader(std::move(file)) { }
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/**
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* Returns the type of the file
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* @param file FileUtil::IOFile open file
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* @return FileType found, or FileType::Error if this loader doesn't know it
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*/
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static FileType IdentifyType(FileUtil::IOFile& file);
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/**
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* Load the bootable file
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* @return ResultStatus result of function
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@ -19,11 +19,32 @@ namespace Loader {
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/**
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* Identifies the type of a bootable file
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* @param filename String filename of bootable file
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* @todo (ShizZy) this function sucks... make it actually check file contents etc.
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* @param file open file
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* @return FileType of file
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*/
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FileType IdentifyFile(const std::string &filename) {
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static FileType IdentifyFile(FileUtil::IOFile& file) {
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FileType type;
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#define CHECK_TYPE(loader) \
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type = AppLoader_##loader::IdentifyType(file); \
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if (FileType::Error != type) \
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return type;
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CHECK_TYPE(THREEDSX)
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CHECK_TYPE(ELF)
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CHECK_TYPE(NCCH)
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#undef CHECK_TYPE
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return FileType::Unknown;
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}
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/**
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* Guess the type of a bootable file from its extension
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* @param filename String filename of bootable file
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* @return FileType of file
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*/
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static FileType GuessFromFilename(const std::string& filename) {
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if (filename.size() == 0) {
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LOG_ERROR(Loader, "invalid filename %s", filename.c_str());
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return FileType::Error;
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@ -34,22 +55,20 @@ FileType IdentifyFile(const std::string &filename) {
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return FileType::Unknown;
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std::string extension = Common::ToLower(filename.substr(extension_loc));
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// TODO(bunnei): Do actual filetype checking instead of naively checking the extension
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if (extension == ".elf") {
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if (extension == ".elf")
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return FileType::ELF;
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} else if (extension == ".axf") {
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else if (extension == ".axf")
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return FileType::ELF;
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} else if (extension == ".cxi") {
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else if (extension == ".cxi")
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return FileType::CXI;
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} else if (extension == ".cci") {
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else if (extension == ".cci")
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return FileType::CCI;
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} else if (extension == ".bin") {
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else if (extension == ".bin")
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return FileType::BIN;
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} else if (extension == ".3ds") {
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else if (extension == ".3ds")
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return FileType::CCI;
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} else if (extension == ".3dsx") {
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else if (extension == ".3dsx")
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return FileType::THREEDSX;
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}
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return FileType::Unknown;
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}
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@ -60,7 +79,16 @@ ResultStatus LoadFile(const std::string& filename) {
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if (!file->IsOpen())
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return ResultStatus::Error;
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switch (IdentifyFile(filename)) {
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FileType type = IdentifyFile(*file);
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FileType filename_type = GuessFromFilename(filename);
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if (type != filename_type) {
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LOG_WARNING(Loader, "File %s has a different type than its extension.", filename.c_str());
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if (FileType::Unknown == type)
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type = filename_type;
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}
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switch (type) {
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//3DSX file format...
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case FileType::THREEDSX:
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@ -72,7 +100,8 @@ ResultStatus LoadFile(const std::string& filename) {
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// NCCH/NCSD container formats...
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case FileType::CXI:
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case FileType::CCI: {
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case FileType::CCI:
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{
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AppLoader_NCCH app_loader(std::move(file));
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// Load application and RomFS
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@ -100,10 +129,11 @@ ResultStatus LoadFile(const std::string& filename) {
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// IdentifyFile could know identify file type...
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case FileType::Unknown:
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default:
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{
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LOG_CRITICAL(Loader, "File %s is of unknown type.");
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return ResultStatus::ErrorInvalidFormat;
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}
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}
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return ResultStatus::Error;
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}
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@ -38,6 +38,10 @@ enum class ResultStatus {
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ErrorMemoryAllocationFailed,
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};
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static u32 MakeMagic(char a, char b, char c, char d) {
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return a | b << 8 | c << 16 | d << 24;
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}
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/// Interface for loading an application
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class AppLoader : NonCopyable {
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public:
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@ -100,13 +104,6 @@ protected:
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bool is_loaded = false;
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};
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/**
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* Identifies the type of a bootable file
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* @param filename String filename of bootable file
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* @return FileType of file
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*/
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FileType IdentifyFile(const std::string &filename);
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/**
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* Identifies and loads a bootable file
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* @param filename String filename of bootable file
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@ -97,6 +97,21 @@ static bool LZSS_Decompress(u8* compressed, u32 compressed_size, u8* decompresse
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// AppLoader_NCCH class
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FileType AppLoader_NCCH::IdentifyType(FileUtil::IOFile& file) {
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u32 magic;
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file.Seek(0x100, SEEK_SET);
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if (1 != file.ReadArray<u32>(&magic, 1))
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return FileType::Error;
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if (MakeMagic('N', 'C', 'S', 'D') == magic)
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return FileType::CCI;
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if (MakeMagic('N', 'C', 'C', 'H') == magic)
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return FileType::CXI;
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return FileType::Error;
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}
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ResultStatus AppLoader_NCCH::LoadExec() const {
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if (!is_loaded)
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return ResultStatus::ErrorNotLoaded;
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@ -171,7 +186,7 @@ ResultStatus AppLoader_NCCH::Load() {
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file->ReadBytes(&ncch_header, sizeof(NCCH_Header));
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// Skip NCSD header and load first NCCH (NCSD is just a container of NCCH files)...
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if (0 == memcmp(&ncch_header.magic, "NCSD", 4)) {
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if (MakeMagic('N', 'C', 'S', 'D') == ncch_header.magic) {
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LOG_WARNING(Loader, "Only loading the first (bootable) NCCH within the NCSD file!");
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ncch_offset = 0x4000;
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file->Seek(ncch_offset, SEEK_SET);
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@ -179,7 +194,7 @@ ResultStatus AppLoader_NCCH::Load() {
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}
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// Verify we are loading the correct file type...
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if (0 != memcmp(&ncch_header.magic, "NCCH", 4))
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if (MakeMagic('N', 'C', 'C', 'H') != ncch_header.magic)
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return ResultStatus::ErrorInvalidFormat;
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// Read ExHeader...
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@ -13,7 +13,7 @@
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struct NCCH_Header {
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u8 signature[0x100];
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char magic[4];
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u32 magic;
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u32 content_size;
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u8 partition_id[8];
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u16 maker_code;
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@ -148,6 +148,13 @@ class AppLoader_NCCH final : public AppLoader {
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public:
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AppLoader_NCCH(std::unique_ptr<FileUtil::IOFile>&& file) : AppLoader(std::move(file)) { }
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/**
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* Returns the type of the file
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* @param file FileUtil::IOFile open file
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* @return FileType found, or FileType::Error if this loader doesn't know it
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*/
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static FileType IdentifyType(FileUtil::IOFile& file);
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/**
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* Load the application
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* @return ResultStatus result of function
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