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Loader/NCCH: Add support for loading application updates (#2927)
Loader/NCCH: Add support for loading application updates (#2927)
* 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 referencepull/15/merge
Max Thomas
8 years ago
committed by
B3n30
B3n30
8 changed files with 670 additions and 439 deletions
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1src/core/CMakeLists.txt
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28src/core/file_sys/archive_selfncch.cpp
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4src/core/file_sys/archive_selfncch.h
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316src/core/file_sys/ncch_container.cpp
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244src/core/file_sys/ncch_container.h
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13src/core/loader/loader.h
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319src/core/loader/ncch.cpp
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184src/core/loader/ncch.h
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// Copyright 2017 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 <cinttypes>
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#include <cstring>
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#include <memory>
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#include "common/common_types.h"
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#include "common/logging/log.h"
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#include "core/core.h"
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#include "core/file_sys/ncch_container.h"
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#include "core/loader/loader.h"
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// FileSys namespace
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namespace FileSys { |
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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(const 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(const u8* compressed, u32 compressed_size, u8* decompressed, |
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u32 decompressed_size) { |
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const u8* footer = compressed + compressed_size - 8; |
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u32 buffer_top_and_bottom = *reinterpret_cast<const 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 (unsigned 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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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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for (unsigned 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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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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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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NCCHContainer::NCCHContainer(const std::string& filepath) : filepath(filepath) { |
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file = FileUtil::IOFile(filepath, "rb"); |
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} |
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Loader::ResultStatus NCCHContainer::OpenFile(const std::string& filepath) { |
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this->filepath = filepath; |
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file = FileUtil::IOFile(filepath, "rb"); |
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if (!file.IsOpen()) { |
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LOG_WARNING(Service_FS, "Failed to open %s", filepath.c_str()); |
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return Loader::ResultStatus::Error; |
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} |
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LOG_DEBUG(Service_FS, "Opened %s", filepath.c_str()); |
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return Loader::ResultStatus::Success; |
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} |
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Loader::ResultStatus NCCHContainer::Load() { |
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if (is_loaded) |
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return Loader::ResultStatus::Success; |
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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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if (file.ReadBytes(&ncch_header, sizeof(NCCH_Header)) != sizeof(NCCH_Header)) |
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return Loader::ResultStatus::Error; |
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// Skip NCSD header and load first NCCH (NCSD is just a container of NCCH files)...
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if (Loader::MakeMagic('N', 'C', 'S', 'D') == ncch_header.magic) { |
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LOG_DEBUG(Service_FS, "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 (Loader::MakeMagic('N', 'C', 'C', 'H') != ncch_header.magic) |
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return Loader::ResultStatus::ErrorInvalidFormat; |
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// System archives and DLC don't have an extended header but have RomFS
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if (ncch_header.extended_header_size) { |
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if (file.ReadBytes(&exheader_header, sizeof(ExHeader_Header)) != sizeof(ExHeader_Header)) |
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return Loader::ResultStatus::Error; |
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is_compressed = (exheader_header.codeset_info.flags.flag & 1) == 1; |
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u32 entry_point = exheader_header.codeset_info.text.address; |
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u32 code_size = exheader_header.codeset_info.text.code_size; |
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u32 stack_size = exheader_header.codeset_info.stack_size; |
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u32 bss_size = exheader_header.codeset_info.bss_size; |
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u32 core_version = exheader_header.arm11_system_local_caps.core_version; |
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u8 priority = exheader_header.arm11_system_local_caps.priority; |
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u8 resource_limit_category = |
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exheader_header.arm11_system_local_caps.resource_limit_category; |
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LOG_DEBUG(Service_FS, "Name: %s", exheader_header.codeset_info.name); |
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LOG_DEBUG(Service_FS, "Program ID: %016" PRIX64, ncch_header.program_id); |
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LOG_DEBUG(Service_FS, "Code compressed: %s", is_compressed ? "yes" : "no"); |
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LOG_DEBUG(Service_FS, "Entry point: 0x%08X", entry_point); |
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LOG_DEBUG(Service_FS, "Code size: 0x%08X", code_size); |
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LOG_DEBUG(Service_FS, "Stack size: 0x%08X", stack_size); |
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LOG_DEBUG(Service_FS, "Bss size: 0x%08X", bss_size); |
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LOG_DEBUG(Service_FS, "Core version: %d", core_version); |
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LOG_DEBUG(Service_FS, "Thread priority: 0x%X", priority); |
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LOG_DEBUG(Service_FS, "Resource limit category: %d", resource_limit_category); |
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LOG_DEBUG(Service_FS, "System Mode: %d", |
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static_cast<int>(exheader_header.arm11_system_local_caps.system_mode)); |
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if (exheader_header.system_info.jump_id != ncch_header.program_id) { |
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LOG_ERROR(Service_FS, "ExHeader Program ID mismatch: the ROM is probably encrypted."); |
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return Loader::ResultStatus::ErrorEncrypted; |
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} |
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has_exheader = true; |
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} |
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// DLC can have an ExeFS and a RomFS but no extended header
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if (ncch_header.exefs_size) { |
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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(Service_FS, "ExeFS offset: 0x%08X", exefs_offset); |
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LOG_DEBUG(Service_FS, "ExeFS size: 0x%08X", exefs_size); |
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file.Seek(exefs_offset + ncch_offset, SEEK_SET); |
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if (file.ReadBytes(&exefs_header, sizeof(ExeFs_Header)) != sizeof(ExeFs_Header)) |
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return Loader::ResultStatus::Error; |
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has_exefs = true; |
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} |
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if (ncch_header.romfs_offset != 0 && ncch_header.romfs_size != 0) |
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has_romfs = true; |
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is_loaded = true; |
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return Loader::ResultStatus::Success; |
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} |
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Loader::ResultStatus NCCHContainer::LoadSectionExeFS(const char* name, std::vector<u8>& buffer) { |
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if (!file.IsOpen()) |
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return Loader::ResultStatus::Error; |
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Loader::ResultStatus result = Load(); |
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if (result != Loader::ResultStatus::Success) |
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return result; |
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if (!has_exefs) |
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return Loader::ResultStatus::ErrorNotUsed; |
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LOG_DEBUG(Service_FS, "%d sections:", kMaxSections); |
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// Iterate through the ExeFs archive until we find a section with the specified name...
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for (unsigned section_number = 0; section_number < kMaxSections; section_number++) { |
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const auto& section = exefs_header.section[section_number]; |
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// Load the specified section...
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if (strcmp(section.name, name) == 0) { |
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LOG_DEBUG(Service_FS, "%d - offset: 0x%08X, size: 0x%08X, name: %s", section_number, |
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section.offset, section.size, section.name); |
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s64 section_offset = |
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(section.offset + exefs_offset + sizeof(ExeFs_Header) + ncch_offset); |
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file.Seek(section_offset, SEEK_SET); |
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if (strcmp(section.name, ".code") == 0 && is_compressed) { |
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// Section is compressed, 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[section.size]); |
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} catch (std::bad_alloc&) { |
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return Loader::ResultStatus::ErrorMemoryAllocationFailed; |
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} |
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if (file.ReadBytes(&temp_buffer[0], section.size) != section.size) |
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return Loader::ResultStatus::Error; |
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// Decompress .code section...
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u32 decompressed_size = LZSS_GetDecompressedSize(&temp_buffer[0], section.size); |
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buffer.resize(decompressed_size); |
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if (!LZSS_Decompress(&temp_buffer[0], section.size, &buffer[0], decompressed_size)) |
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return Loader::ResultStatus::ErrorInvalidFormat; |
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} else { |
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// Section is uncompressed...
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buffer.resize(section.size); |
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if (file.ReadBytes(&buffer[0], section.size) != section.size) |
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return Loader::ResultStatus::Error; |
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} |
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return Loader::ResultStatus::Success; |
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} |
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} |
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return Loader::ResultStatus::ErrorNotUsed; |
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} |
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Loader::ResultStatus NCCHContainer::ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, |
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u64& offset, u64& size) { |
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if (!file.IsOpen()) |
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return Loader::ResultStatus::Error; |
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Loader::ResultStatus result = Load(); |
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if (result != Loader::ResultStatus::Success) |
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return result; |
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if (!has_romfs) { |
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LOG_DEBUG(Service_FS, "RomFS requested from NCCH which has no RomFS"); |
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return Loader::ResultStatus::ErrorNotUsed; |
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} |
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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(Service_FS, "RomFS offset: 0x%08X", romfs_offset); |
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LOG_DEBUG(Service_FS, "RomFS size: 0x%08X", romfs_size); |
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if (file.GetSize() < romfs_offset + romfs_size) |
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return Loader::ResultStatus::Error; |
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// We reopen the file, to allow its position to be independent from file's
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romfs_file = std::make_shared<FileUtil::IOFile>(filepath, "rb"); |
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if (!romfs_file->IsOpen()) |
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return Loader::ResultStatus::Error; |
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offset = romfs_offset; |
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size = romfs_size; |
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return Loader::ResultStatus::Success; |
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} |
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Loader::ResultStatus NCCHContainer::ReadProgramId(u64_le& program_id) { |
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Loader::ResultStatus result = Load(); |
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if (result != Loader::ResultStatus::Success) |
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return result; |
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program_id = ncch_header.program_id; |
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return Loader::ResultStatus::Success; |
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} |
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bool NCCHContainer::HasExeFS() { |
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Loader::ResultStatus result = Load(); |
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if (result != Loader::ResultStatus::Success) |
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return false; |
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return has_exefs; |
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} |
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bool NCCHContainer::HasRomFS() { |
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Loader::ResultStatus result = Load(); |
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if (result != Loader::ResultStatus::Success) |
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return false; |
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return has_romfs; |
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} |
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bool NCCHContainer::HasExHeader() { |
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Loader::ResultStatus result = Load(); |
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if (result != Loader::ResultStatus::Success) |
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return false; |
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return has_exheader; |
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} |
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} // namespace FileSys
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@ -0,0 +1,244 @@ |
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// Copyright 2017 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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#pragma once |
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#include <cstddef> |
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#include <memory> |
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#include <string> |
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#include <vector> |
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#include "common/bit_field.h" |
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#include "common/common_types.h" |
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#include "common/file_util.h" |
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#include "common/swap.h" |
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#include "core/core.h" |
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//////////////////////////////////////////////////////////////////////////////////////////////////// |
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/// NCCH header (Note: "NCCH" appears to be a publicly unknown acronym) |
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struct NCCH_Header { |
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u8 signature[0x100]; |
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u32_le magic; |
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u32_le content_size; |
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u8 partition_id[8]; |
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u16_le maker_code; |
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u16_le version; |
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u8 reserved_0[4]; |
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u64_le program_id; |
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u8 reserved_1[0x10]; |
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u8 logo_region_hash[0x20]; |
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u8 product_code[0x10]; |
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u8 extended_header_hash[0x20]; |
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u32_le extended_header_size; |
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u8 reserved_2[4]; |
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u8 flags[8]; |
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u32_le plain_region_offset; |
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u32_le plain_region_size; |
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u32_le logo_region_offset; |
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u32_le logo_region_size; |
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u32_le exefs_offset; |
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u32_le exefs_size; |
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u32_le exefs_hash_region_size; |
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u8 reserved_3[4]; |
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u32_le romfs_offset; |
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u32_le romfs_size; |
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u32_le romfs_hash_region_size; |
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u8 reserved_4[4]; |
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u8 exefs_super_block_hash[0x20]; |
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u8 romfs_super_block_hash[0x20]; |
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}; |
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static_assert(sizeof(NCCH_Header) == 0x200, "NCCH header structure size is wrong"); |
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//////////////////////////////////////////////////////////////////////////////////////////////////// |
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// ExeFS (executable file system) headers |
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struct ExeFs_SectionHeader { |
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char name[8]; |
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u32 offset; |
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u32 size; |
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}; |
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struct ExeFs_Header { |
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ExeFs_SectionHeader section[8]; |
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u8 reserved[0x80]; |
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u8 hashes[8][0x20]; |
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}; |
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//////////////////////////////////////////////////////////////////////////////////////////////////// |
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// ExHeader (executable file system header) headers |
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struct ExHeader_SystemInfoFlags { |
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u8 reserved[5]; |
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u8 flag; |
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u8 remaster_version[2]; |
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}; |
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struct ExHeader_CodeSegmentInfo { |
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u32 address; |
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u32 num_max_pages; |
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u32 code_size; |
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}; |
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struct ExHeader_CodeSetInfo { |
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u8 name[8]; |
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ExHeader_SystemInfoFlags flags; |
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ExHeader_CodeSegmentInfo text; |
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u32 stack_size; |
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ExHeader_CodeSegmentInfo ro; |
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u8 reserved[4]; |
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ExHeader_CodeSegmentInfo data; |
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u32 bss_size; |
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}; |
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struct ExHeader_DependencyList { |
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u8 program_id[0x30][8]; |
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}; |
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struct ExHeader_SystemInfo { |
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u64 save_data_size; |
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u64_le jump_id; |
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u8 reserved_2[0x30]; |
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}; |
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struct ExHeader_StorageInfo { |
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u8 ext_save_data_id[8]; |
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u8 system_save_data_id[8]; |
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u8 reserved[8]; |
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u8 access_info[7]; |
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u8 other_attributes; |
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}; |
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struct ExHeader_ARM11_SystemLocalCaps { |
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u64_le program_id; |
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u32_le core_version; |
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u8 reserved_flags[2]; |
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union { |
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u8 flags0; |
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BitField<0, 2, u8> ideal_processor; |
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BitField<2, 2, u8> affinity_mask; |
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BitField<4, 4, u8> system_mode; |
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}; |
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u8 priority; |
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u8 resource_limit_descriptor[0x10][2]; |
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ExHeader_StorageInfo storage_info; |
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u8 service_access_control[0x20][8]; |
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u8 ex_service_access_control[0x2][8]; |
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u8 reserved[0xf]; |
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u8 resource_limit_category; |
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}; |
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struct ExHeader_ARM11_KernelCaps { |
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u32_le descriptors[28]; |
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u8 reserved[0x10]; |
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}; |
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struct ExHeader_ARM9_AccessControl { |
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u8 descriptors[15]; |
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u8 descversion; |
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}; |
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struct ExHeader_Header { |
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ExHeader_CodeSetInfo codeset_info; |
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ExHeader_DependencyList dependency_list; |
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ExHeader_SystemInfo system_info; |
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ExHeader_ARM11_SystemLocalCaps arm11_system_local_caps; |
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ExHeader_ARM11_KernelCaps arm11_kernel_caps; |
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ExHeader_ARM9_AccessControl arm9_access_control; |
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struct { |
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u8 signature[0x100]; |
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u8 ncch_public_key_modulus[0x100]; |
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ExHeader_ARM11_SystemLocalCaps arm11_system_local_caps; |
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ExHeader_ARM11_KernelCaps arm11_kernel_caps; |
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ExHeader_ARM9_AccessControl arm9_access_control; |
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} access_desc; |
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}; |
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static_assert(sizeof(ExHeader_Header) == 0x800, "ExHeader structure size is wrong"); |
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//////////////////////////////////////////////////////////////////////////////////////////////////// |
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// FileSys namespace |
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namespace FileSys { |
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/** |
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* Helper which implements an interface to deal with NCCH containers which can |
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* contain ExeFS archives or RomFS archives for games or other applications. |
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*/ |
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class NCCHContainer { |
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public: |
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NCCHContainer(const std::string& filepath); |
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NCCHContainer() {} |
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|
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Loader::ResultStatus OpenFile(const std::string& filepath); |
|||
|
|||
/** |
|||
* Ensure ExeFS and exheader is loaded and ready for reading sections |
|||
* @return ResultStatus result of function |
|||
*/ |
|||
Loader::ResultStatus Load(); |
|||
|
|||
/** |
|||
* Reads an application ExeFS section of an NCCH file (e.g. .code, .logo, etc.) |
|||
* @param name Name of section to read out of NCCH file |
|||
* @param buffer Vector to read data into |
|||
* @return ResultStatus result of function |
|||
*/ |
|||
Loader::ResultStatus LoadSectionExeFS(const char* name, std::vector<u8>& buffer); |
|||
|
|||
/** |
|||
* Get the RomFS of the NCCH container |
|||
* Since the RomFS can be huge, we return a file reference instead of copying to a buffer |
|||
* @param romfs_file The file containing the RomFS |
|||
* @param offset The offset the romfs begins on |
|||
* @param size The size of the romfs |
|||
* @return ResultStatus result of function |
|||
*/ |
|||
Loader::ResultStatus ReadRomFS(std::shared_ptr<FileUtil::IOFile>& romfs_file, u64& offset, |
|||
u64& size); |
|||
|
|||
/** |
|||
* Get the Program ID of the NCCH container |
|||
* @return ResultStatus result of function |
|||
*/ |
|||
Loader::ResultStatus ReadProgramId(u64_le& program_id); |
|||
|
|||
/** |
|||
* Checks whether the NCCH container contains an ExeFS |
|||
* @return bool check result |
|||
*/ |
|||
bool HasExeFS(); |
|||
|
|||
/** |
|||
* Checks whether the NCCH container contains a RomFS |
|||
* @return bool check result |
|||
*/ |
|||
bool HasRomFS(); |
|||
|
|||
/** |
|||
* Checks whether the NCCH container contains an ExHeader |
|||
* @return bool check result |
|||
*/ |
|||
bool HasExHeader(); |
|||
|
|||
NCCH_Header ncch_header; |
|||
ExeFs_Header exefs_header; |
|||
ExHeader_Header exheader_header; |
|||
|
|||
private: |
|||
bool has_exheader = false; |
|||
bool has_exefs = false; |
|||
bool has_romfs = false; |
|||
|
|||
bool is_loaded = false; |
|||
bool is_compressed = false; |
|||
|
|||
u32 ncch_offset = 0; // Offset to NCCH header, can be 0 or after NCSD header |
|||
u32 exefs_offset = 0; |
|||
|
|||
std::string filepath; |
|||
FileUtil::IOFile file; |
|||
}; |
|||
|
|||
} // namespace FileSys |
|||
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