c91ccbd0ba
* loader/ncch: split NCCH parsing into its own file * loader/ncch: add support for loading update NCCHs from the SD card * loader/ncch: fix formatting * file_sys/ncch_container: Return a value for OpenFile * loader/ncch: cleanup, always instantiate overlay_ncch to base_ncch * file_sys/ncch_container: better encryption checks, allow non-app NCCHs to load properly and for the existence of NCCH structures to be checked * file_sys/ncch_container: pass filepath as a const reference
316 lines
12 KiB
C++
316 lines
12 KiB
C++
// Copyright 2017 Citra Emulator Project
|
|
// Licensed under GPLv2 or any later version
|
|
// Refer to the license.txt file included.
|
|
|
|
#include <cinttypes>
|
|
#include <cstring>
|
|
#include <memory>
|
|
#include "common/common_types.h"
|
|
#include "common/logging/log.h"
|
|
#include "core/core.h"
|
|
#include "core/file_sys/ncch_container.h"
|
|
#include "core/loader/loader.h"
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////////
|
|
// FileSys namespace
|
|
|
|
namespace FileSys {
|
|
|
|
static const int kMaxSections = 8; ///< Maximum number of sections (files) in an ExeFs
|
|
static const int kBlockSize = 0x200; ///< Size of ExeFS blocks (in bytes)
|
|
|
|
/**
|
|
* Get the decompressed size of an LZSS compressed ExeFS file
|
|
* @param buffer Buffer of compressed file
|
|
* @param size Size of compressed buffer
|
|
* @return Size of decompressed buffer
|
|
*/
|
|
static u32 LZSS_GetDecompressedSize(const u8* buffer, u32 size) {
|
|
u32 offset_size = *(u32*)(buffer + size - 4);
|
|
return offset_size + size;
|
|
}
|
|
|
|
/**
|
|
* Decompress ExeFS file (compressed with LZSS)
|
|
* @param compressed Compressed buffer
|
|
* @param compressed_size Size of compressed buffer
|
|
* @param decompressed Decompressed buffer
|
|
* @param decompressed_size Size of decompressed buffer
|
|
* @return True on success, otherwise false
|
|
*/
|
|
static bool LZSS_Decompress(const u8* compressed, u32 compressed_size, u8* decompressed,
|
|
u32 decompressed_size) {
|
|
const u8* footer = compressed + compressed_size - 8;
|
|
u32 buffer_top_and_bottom = *reinterpret_cast<const u32*>(footer);
|
|
u32 out = decompressed_size;
|
|
u32 index = compressed_size - ((buffer_top_and_bottom >> 24) & 0xFF);
|
|
u32 stop_index = compressed_size - (buffer_top_and_bottom & 0xFFFFFF);
|
|
|
|
memset(decompressed, 0, decompressed_size);
|
|
memcpy(decompressed, compressed, compressed_size);
|
|
|
|
while (index > stop_index) {
|
|
u8 control = compressed[--index];
|
|
|
|
for (unsigned i = 0; i < 8; i++) {
|
|
if (index <= stop_index)
|
|
break;
|
|
if (index <= 0)
|
|
break;
|
|
if (out <= 0)
|
|
break;
|
|
|
|
if (control & 0x80) {
|
|
// Check if compression is out of bounds
|
|
if (index < 2)
|
|
return false;
|
|
index -= 2;
|
|
|
|
u32 segment_offset = compressed[index] | (compressed[index + 1] << 8);
|
|
u32 segment_size = ((segment_offset >> 12) & 15) + 3;
|
|
segment_offset &= 0x0FFF;
|
|
segment_offset += 2;
|
|
|
|
// Check if compression is out of bounds
|
|
if (out < segment_size)
|
|
return false;
|
|
|
|
for (unsigned j = 0; j < segment_size; j++) {
|
|
// Check if compression is out of bounds
|
|
if (out + segment_offset >= decompressed_size)
|
|
return false;
|
|
|
|
u8 data = decompressed[out + segment_offset];
|
|
decompressed[--out] = data;
|
|
}
|
|
} else {
|
|
// Check if compression is out of bounds
|
|
if (out < 1)
|
|
return false;
|
|
decompressed[--out] = compressed[--index];
|
|
}
|
|
control <<= 1;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
|
|
NCCHContainer::NCCHContainer(const std::string& filepath) : filepath(filepath) {
|
|
file = FileUtil::IOFile(filepath, "rb");
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::OpenFile(const std::string& filepath) {
|
|
this->filepath = filepath;
|
|
file = FileUtil::IOFile(filepath, "rb");
|
|
|
|
if (!file.IsOpen()) {
|
|
LOG_WARNING(Service_FS, "Failed to open %s", filepath.c_str());
|
|
return Loader::ResultStatus::Error;
|
|
}
|
|
|
|
LOG_DEBUG(Service_FS, "Opened %s", filepath.c_str());
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::Load() {
|
|
if (is_loaded)
|
|
return Loader::ResultStatus::Success;
|
|
|
|
// Reset read pointer in case this file has been read before.
|
|
file.Seek(0, SEEK_SET);
|
|
|
|
if (file.ReadBytes(&ncch_header, sizeof(NCCH_Header)) != sizeof(NCCH_Header))
|
|
return Loader::ResultStatus::Error;
|
|
|
|
// Skip NCSD header and load first NCCH (NCSD is just a container of NCCH files)...
|
|
if (Loader::MakeMagic('N', 'C', 'S', 'D') == ncch_header.magic) {
|
|
LOG_DEBUG(Service_FS, "Only loading the first (bootable) NCCH within the NCSD file!");
|
|
ncch_offset = 0x4000;
|
|
file.Seek(ncch_offset, SEEK_SET);
|
|
file.ReadBytes(&ncch_header, sizeof(NCCH_Header));
|
|
}
|
|
|
|
// Verify we are loading the correct file type...
|
|
if (Loader::MakeMagic('N', 'C', 'C', 'H') != ncch_header.magic)
|
|
return Loader::ResultStatus::ErrorInvalidFormat;
|
|
|
|
// System archives and DLC don't have an extended header but have RomFS
|
|
if (ncch_header.extended_header_size) {
|
|
if (file.ReadBytes(&exheader_header, sizeof(ExHeader_Header)) != sizeof(ExHeader_Header))
|
|
return Loader::ResultStatus::Error;
|
|
|
|
is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1;
|
|
u32 entry_point = exheader_header.codeset_info.text.address;
|
|
u32 code_size = exheader_header.codeset_info.text.code_size;
|
|
u32 stack_size = exheader_header.codeset_info.stack_size;
|
|
u32 bss_size = exheader_header.codeset_info.bss_size;
|
|
u32 core_version = exheader_header.arm11_system_local_caps.core_version;
|
|
u8 priority = exheader_header.arm11_system_local_caps.priority;
|
|
u8 resource_limit_category =
|
|
exheader_header.arm11_system_local_caps.resource_limit_category;
|
|
|
|
LOG_DEBUG(Service_FS, "Name: %s", exheader_header.codeset_info.name);
|
|
LOG_DEBUG(Service_FS, "Program ID: %016" PRIX64, ncch_header.program_id);
|
|
LOG_DEBUG(Service_FS, "Code compressed: %s", is_compressed ? "yes" : "no");
|
|
LOG_DEBUG(Service_FS, "Entry point: 0x%08X", entry_point);
|
|
LOG_DEBUG(Service_FS, "Code size: 0x%08X", code_size);
|
|
LOG_DEBUG(Service_FS, "Stack size: 0x%08X", stack_size);
|
|
LOG_DEBUG(Service_FS, "Bss size: 0x%08X", bss_size);
|
|
LOG_DEBUG(Service_FS, "Core version: %d", core_version);
|
|
LOG_DEBUG(Service_FS, "Thread priority: 0x%X", priority);
|
|
LOG_DEBUG(Service_FS, "Resource limit category: %d", resource_limit_category);
|
|
LOG_DEBUG(Service_FS, "System Mode: %d",
|
|
static_cast<int>(exheader_header.arm11_system_local_caps.system_mode));
|
|
|
|
if (exheader_header.system_info.jump_id != ncch_header.program_id) {
|
|
LOG_ERROR(Service_FS, "ExHeader Program ID mismatch: the ROM is probably encrypted.");
|
|
return Loader::ResultStatus::ErrorEncrypted;
|
|
}
|
|
|
|
has_exheader = true;
|
|
}
|
|
|
|
// DLC can have an ExeFS and a RomFS but no extended header
|
|
if (ncch_header.exefs_size) {
|
|
exefs_offset = ncch_header.exefs_offset * kBlockSize;
|
|
u32 exefs_size = ncch_header.exefs_size * kBlockSize;
|
|
|
|
LOG_DEBUG(Service_FS, "ExeFS offset: 0x%08X", exefs_offset);
|
|
LOG_DEBUG(Service_FS, "ExeFS size: 0x%08X", exefs_size);
|
|
|
|
file.Seek(exefs_offset + ncch_offset, SEEK_SET);
|
|
if (file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) != sizeof(ExeFs_Header))
|
|
return Loader::ResultStatus::Error;
|
|
|
|
has_exefs = true;
|
|
}
|
|
|
|
if (ncch_header.romfs_offset != 0 && ncch_header.romfs_size != 0)
|
|
has_romfs = true;
|
|
|
|
is_loaded = true;
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) {
|
|
if (!file.IsOpen())
|
|
return Loader::ResultStatus::Error;
|
|
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return result;
|
|
|
|
if (!has_exefs)
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
|
|
LOG_DEBUG(Service_FS, "%d sections:", kMaxSections);
|
|
// Iterate through the ExeFs archive until we find a section with the specified name...
|
|
for (unsigned section_number = 0; section_number < kMaxSections; section_number++) {
|
|
const auto& section = exefs_header.section[section_number];
|
|
|
|
// Load the specified section...
|
|
if (strcmp(section.name, name) == 0) {
|
|
LOG_DEBUG(Service_FS, "%d - offset: 0x%08X, size: 0x%08X, name: %s", section_number,
|
|
section.offset, section.size, section.name);
|
|
|
|
s64 section_offset =
|
|
(section.offset + exefs_offset + sizeof(ExeFs_Header) + ncch_offset);
|
|
file.Seek(section_offset, SEEK_SET);
|
|
|
|
if (strcmp(section.name, ".code") == 0 && is_compressed) {
|
|
// Section is compressed, read compressed .code section...
|
|
std::unique_ptr<u8[]> temp_buffer;
|
|
try {
|
|
temp_buffer.reset(new u8[section.size]);
|
|
} catch (std::bad_alloc&) {
|
|
return Loader::ResultStatus::ErrorMemoryAllocationFailed;
|
|
}
|
|
|
|
if (file.ReadBytes(&temp_buffer[0], section.size) != section.size)
|
|
return Loader::ResultStatus::Error;
|
|
|
|
// Decompress .code section...
|
|
u32 decompressed_size = LZSS_GetDecompressedSize(&temp_buffer[0], section.size);
|
|
buffer.resize(decompressed_size);
|
|
if (!LZSS_Decompress(&temp_buffer[0], section.size, &buffer[0], decompressed_size))
|
|
return Loader::ResultStatus::ErrorInvalidFormat;
|
|
} else {
|
|
// Section is uncompressed...
|
|
buffer.resize(section.size);
|
|
if (file.ReadBytes(&buffer[0], section.size) != section.size)
|
|
return Loader::ResultStatus::Error;
|
|
}
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
}
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file,
|
|
u64& offset, u64& size) {
|
|
if (!file.IsOpen())
|
|
return Loader::ResultStatus::Error;
|
|
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return result;
|
|
|
|
if (!has_romfs) {
|
|
LOG_DEBUG(Service_FS, "RomFS requested from NCCH which has no RomFS");
|
|
return Loader::ResultStatus::ErrorNotUsed;
|
|
}
|
|
|
|
u32 romfs_offset = ncch_offset + (ncch_header.romfs_offset * kBlockSize) + 0x1000;
|
|
u32 romfs_size = (ncch_header.romfs_size * kBlockSize) - 0x1000;
|
|
|
|
LOG_DEBUG(Service_FS, "RomFS offset: 0x%08X", romfs_offset);
|
|
LOG_DEBUG(Service_FS, "RomFS size: 0x%08X", romfs_size);
|
|
|
|
if (file.GetSize() < romfs_offset + romfs_size)
|
|
return Loader::ResultStatus::Error;
|
|
|
|
// We reopen the file, to allow its position to be independent from file's
|
|
romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb");
|
|
if (!romfs_file->IsOpen())
|
|
return Loader::ResultStatus::Error;
|
|
|
|
offset = romfs_offset;
|
|
size = romfs_size;
|
|
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
|
|
Loader::ResultStatus NCCHContainer::ReadProgramId(u64_le& program_id) {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return result;
|
|
|
|
program_id = ncch_header.program_id;
|
|
return Loader::ResultStatus::Success;
|
|
}
|
|
|
|
bool NCCHContainer::HasExeFS() {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return false;
|
|
|
|
return has_exefs;
|
|
}
|
|
|
|
bool NCCHContainer::HasRomFS() {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return false;
|
|
|
|
return has_romfs;
|
|
}
|
|
|
|
bool NCCHContainer::HasExHeader() {
|
|
Loader::ResultStatus result = Load();
|
|
if (result != Loader::ResultStatus::Success)
|
|
return false;
|
|
|
|
return has_exheader;
|
|
}
|
|
|
|
} // namespace FileSys
|