257 lines
8.9 KiB
C++
257 lines
8.9 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include <memory>
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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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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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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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if (!file->IsOpen())
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return ResultStatus::Error;
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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, SEEK_SET);
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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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return ResultStatus::ErrorNotUsed;
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}
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ResultStatus AppLoader_NCCH::Load() {
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if (is_loaded)
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return ResultStatus::ErrorAlreadyLoaded;
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if (!file->IsOpen())
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return ResultStatus::Error;
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// Reset read pointer in case this file has been read before.
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file->Seek(0, SEEK_SET);
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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, SEEK_SET);
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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, SEEK_SET);
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file->ReadBytes(&exefs_header, sizeof(ExeFs_Header));
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LoadExec(); // Load the executable into memory for booting
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is_loaded = true; // Set state to loaded
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return ResultStatus::Success;
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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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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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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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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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ResultStatus AppLoader_NCCH::ReadRomFS(std::vector<u8>& buffer) const {
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if (!file->IsOpen())
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return ResultStatus::Error;
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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, SEEK_SET);
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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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}
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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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