ea9ce0fba7
The savedata for each game is stored in /savedata/<ProgramID> for NCCH files. ELF files and 3DSX files use the folder 0 because they have no ID information Got rid of the code duplication in File and Directory Files that deal with the host machine's file system now live in DiskFile, similarly for directories and DiskDirectory and archives with DiskArchive. FS_U: Use the correct error code when a file wasn't found
322 lines
11 KiB
C++
322 lines
11 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2
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// Refer to the license.txt file included.
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#include <memory>
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#include "common/file_util.h"
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#include "core/loader/ncch.h"
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#include "core/hle/kernel/kernel.h"
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#include "core/mem_map.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// Loader namespace
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namespace Loader {
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static const int kMaxSections = 8; ///< Maximum number of sections (files) in an ExeFs
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static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
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/**
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* Get the decompressed size of an LZSS compressed ExeFS file
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* @param buffer Buffer of compressed file
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* @param size Size of compressed buffer
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* @return Size of decompressed buffer
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*/
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static u32 LZSS_GetDecompressedSize(u8* buffer, u32 size) {
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u32 offset_size = *(u32*)(buffer + size - 4);
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return offset_size + size;
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}
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/**
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* Decompress ExeFS file (compressed with LZSS)
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* @param compressed Compressed buffer
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* @param compressed_size Size of compressed buffer
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* @param decompressed Decompressed buffer
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* @param decompressed_size Size of decompressed buffer
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* @return True on success, otherwise false
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*/
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static bool LZSS_Decompress(u8* compressed, u32 compressed_size, u8* decompressed, u32 decompressed_size) {
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u8* footer = compressed + compressed_size - 8;
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u32 buffer_top_and_bottom = *(u32*)footer;
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u32 out = decompressed_size;
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u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF);
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u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF);
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memset(decompressed, 0, decompressed_size);
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memcpy(decompressed, compressed, compressed_size);
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while(index > stop_index) {
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u8 control = compressed[--index];
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for(u32 i = 0; i < 8; i++) {
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if(index <= stop_index)
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break;
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if(index <= 0)
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break;
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if(out <= 0)
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break;
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if(control & 0x80) {
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// Check if compression is out of bounds
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if(index < 2) {
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return false;
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}
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index -= 2;
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u32 segment_offset = compressed[index] | (compressed[index + 1] << 8);
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u32 segment_size = ((segment_offset >> 12) & 15) + 3;
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segment_offset &= 0x0FFF;
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segment_offset += 2;
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// Check if compression is out of bounds
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if(out < segment_size) {
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return false;
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}
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for(u32 j = 0; j < segment_size; j++) {
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// Check if compression is out of bounds
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if(out + segment_offset >= decompressed_size) {
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return false;
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}
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u8 data = decompressed[out + segment_offset];
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decompressed[--out] = data;
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}
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} else {
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// Check if compression is out of bounds
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if(out < 1) {
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return false;
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}
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decompressed[--out] = compressed[--index];
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}
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control <<= 1;
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}
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}
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return true;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// AppLoader_NCCH class
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/// AppLoader_NCCH constructor
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AppLoader_NCCH::AppLoader_NCCH(const std::string& filename) {
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this->filename = filename;
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is_loaded = false;
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is_compressed = false;
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entry_point = 0;
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ncch_offset = 0;
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exefs_offset = 0;
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}
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/// AppLoader_NCCH destructor
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AppLoader_NCCH::~AppLoader_NCCH() {
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}
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/**
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* Loads .code section into memory for booting
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* @return ResultStatus result of function
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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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std::vector<u8> code;
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if (ResultStatus::Success == ReadCode(code)) {
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Memory::WriteBlock(entry_point, &code[0], code.size());
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Kernel::LoadExec(entry_point);
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return ResultStatus::Success;
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}
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return ResultStatus::Error;
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}
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/**
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* Reads an application ExeFS section of an NCCH file into AppLoader (e.g. .code, .logo, etc.)
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* @param name Name of section to read out of NCCH file
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* @param buffer Vector to read data into
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* @return ResultStatus result of function
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*/
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ResultStatus AppLoader_NCCH::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) const {
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// Iterate through the ExeFs archive until we find the .code file...
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FileUtil::IOFile file(filename, "rb");
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if (file.IsOpen()) {
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LOG_DEBUG(Loader, "%d sections:", kMaxSections);
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for (int i = 0; i < kMaxSections; i++) {
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// Load the specified section...
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if (strcmp((const char*)exefs_header.section[i].name, name) == 0) {
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LOG_DEBUG(Loader, "%d - offset: 0x%08X, size: 0x%08X, name: %s", i,
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exefs_header.section[i].offset, exefs_header.section[i].size,
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exefs_header.section[i].name);
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s64 section_offset = (exefs_header.section[i].offset + exefs_offset +
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sizeof(ExeFs_Header)+ncch_offset);
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file.Seek(section_offset, 0);
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// Section is compressed...
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if (i == 0 && is_compressed) {
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// Read compressed .code section...
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std::unique_ptr<u8[]> temp_buffer;
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try {
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temp_buffer.reset(new u8[exefs_header.section[i].size]);
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} catch (std::bad_alloc&) {
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return ResultStatus::ErrorMemoryAllocationFailed;
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}
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file.ReadBytes(&temp_buffer[0], exefs_header.section[i].size);
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// Decompress .code section...
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u32 decompressed_size = LZSS_GetDecompressedSize(&temp_buffer[0],
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exefs_header.section[i].size);
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buffer.resize(decompressed_size);
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if (!LZSS_Decompress(&temp_buffer[0], exefs_header.section[i].size, &buffer[0],
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decompressed_size)) {
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return ResultStatus::ErrorInvalidFormat;
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}
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// Section is uncompressed...
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}
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else {
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buffer.resize(exefs_header.section[i].size);
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file.ReadBytes(&buffer[0], exefs_header.section[i].size);
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}
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return ResultStatus::Success;
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}
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}
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} else {
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LOG_ERROR(Loader, "Unable to read file %s!", filename.c_str());
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return ResultStatus::Error;
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}
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return ResultStatus::ErrorNotUsed;
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}
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/**
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* Loads an NCCH file (e.g. from a CCI, or the first NCCH in a CXI)
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* @param error_string Pointer to string to put error message if an error has occurred
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* @todo Move NCSD parsing out of here and create a separate function for loading these
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* @return True on success, otherwise false
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*/
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ResultStatus AppLoader_NCCH::Load() {
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LOG_INFO(Loader, "Loading NCCH file %s...", filename.c_str());
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if (is_loaded)
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return ResultStatus::ErrorAlreadyLoaded;
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FileUtil::IOFile file(filename, "rb");
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if (file.IsOpen()) {
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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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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, 0);
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file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
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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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return ResultStatus::ErrorInvalidFormat;
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// Read ExHeader...
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file.ReadBytes(&exheader_header, sizeof(ExHeader_Header));
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is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1;
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entry_point = exheader_header.codeset_info.text.address;
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LOG_INFO(Loader, "Name: %s", exheader_header.codeset_info.name);
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LOG_DEBUG(Loader, "Code compressed: %s", is_compressed ? "yes" : "no");
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LOG_DEBUG(Loader, "Entry point: 0x%08X", entry_point);
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// Read ExeFS...
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exefs_offset = ncch_header.exefs_offset * kBlockSize;
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u32 exefs_size = ncch_header.exefs_size * kBlockSize;
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LOG_DEBUG(Loader, "ExeFS offset: 0x%08X", exefs_offset);
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LOG_DEBUG(Loader, "ExeFS size: 0x%08X", exefs_size);
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file.Seek(exefs_offset + ncch_offset, 0);
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file.ReadBytes(&exefs_header, sizeof(ExeFs_Header));
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is_loaded = true; // Set state to loaded
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LoadExec(); // Load the executable into memory for booting
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return ResultStatus::Success;
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} else {
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LOG_ERROR(Loader, "Unable to read file %s!", filename.c_str());
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}
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return ResultStatus::Error;
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}
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/**
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* Get the code (typically .code section) of the application
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* @param buffer Reference to buffer to store data
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* @return ResultStatus result of function
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*/
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ResultStatus AppLoader_NCCH::ReadCode(std::vector<u8>& buffer) const {
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return LoadSectionExeFS(".code", buffer);
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}
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/**
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* Get the icon (typically icon section) of the application
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* @param buffer Reference to buffer to store data
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* @return ResultStatus result of function
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*/
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ResultStatus AppLoader_NCCH::ReadIcon(std::vector<u8>& buffer) const {
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return LoadSectionExeFS("icon", buffer);
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}
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/**
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* Get the banner (typically banner section) of the application
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* @param buffer Reference to buffer to store data
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* @return ResultStatus result of function
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*/
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ResultStatus AppLoader_NCCH::ReadBanner(std::vector<u8>& buffer) const {
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return LoadSectionExeFS("banner", buffer);
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}
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/**
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* Get the logo (typically logo section) of the application
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* @param buffer Reference to buffer to store data
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* @return ResultStatus result of function
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*/
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ResultStatus AppLoader_NCCH::ReadLogo(std::vector<u8>& buffer) const {
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return LoadSectionExeFS("logo", buffer);
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}
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/**
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* Get the RomFS of the application
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* @param buffer Reference to buffer to store data
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* @return ResultStatus result of function
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*/
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ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) const {
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FileUtil::IOFile file(filename, "rb");
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if (file.IsOpen()) {
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// Check if the NCCH has a RomFS...
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if (ncch_header.romfs_offset != 0 && ncch_header.romfs_size != 0) {
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u32 romfs_offset = ncch_offset + (ncch_header.romfs_offset * kBlockSize) + 0x1000;
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u32 romfs_size = (ncch_header.romfs_size * kBlockSize) - 0x1000;
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LOG_DEBUG(Loader, "RomFS offset: 0x%08X", romfs_offset);
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LOG_DEBUG(Loader, "RomFS size: 0x%08X", romfs_size);
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buffer.resize(romfs_size);
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file.Seek(romfs_offset, 0);
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file.ReadBytes(&buffer[0], romfs_size);
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return ResultStatus::Success;
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}
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LOG_DEBUG(Loader, "NCCH has no RomFS");
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return ResultStatus::ErrorNotUsed;
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} else {
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LOG_ERROR(Loader, "Unable to read file %s!", filename.c_str());
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}
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return ResultStatus::Error;
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}
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u64 AppLoader_NCCH::GetProgramId() const {
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return *reinterpret_cast<u64 const*>(&ncch_header.program_id[0]);
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}
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} // namespace Loader
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