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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <algorithm>
#include <utility>
#include "common/logging/log.h"
#include "core/file_sys/content_archive.h"
#include "core/file_sys/vfs_offset.h"
#include "core/loader/loader.h"
#include "romfs.h"
namespace FileSys {
// Media offsets in headers are stored divided by 512. Mult. by this to get real offset.
constexpr u64 MEDIA_OFFSET_MULTIPLIER = 0x200;
constexpr u64 SECTION_HEADER_SIZE = 0x200;
constexpr u64 SECTION_HEADER_OFFSET = 0x400;
constexpr u32 IVFC_MAX_LEVEL = 6;
enum class NCASectionFilesystemType : u8 {
PFS0 = 0x2,
ROMFS = 0x3,
};
struct NCASectionHeaderBlock {
INSERT_PADDING_BYTES(3);
NCASectionFilesystemType filesystem_type;
u8 crypto_type;
INSERT_PADDING_BYTES(3);
};
static_assert(sizeof(NCASectionHeaderBlock) == 0x8, "NCASectionHeaderBlock has incorrect size.");
struct PFS0Superblock {
NCASectionHeaderBlock header_block;
std::array<u8, 0x20> hash;
u32_le size;
INSERT_PADDING_BYTES(4);
u64_le hash_table_offset;
u64_le hash_table_size;
u64_le pfs0_header_offset;
u64_le pfs0_size;
INSERT_PADDING_BYTES(432);
};
static_assert(sizeof(PFS0Superblock) == 0x200, "PFS0Superblock has incorrect size.");
struct RomFSSuperblock {
NCASectionHeaderBlock header_block;
IVFCHeader ivfc;
};
static_assert(sizeof(RomFSSuperblock) == 0xE8, "RomFSSuperblock has incorrect size.");
NCA::NCA(VirtualFile file_) : file(std::move(file_)) {
if (sizeof(NCAHeader) != file->ReadObject(&header))
LOG_CRITICAL(Loader, "File reader errored out during header read.");
if (!IsValidNCA(header)) {
status = Loader::ResultStatus::ErrorInvalidFormat;
return;
}
std::ptrdiff_t number_sections =
std::count_if(std::begin(header.section_tables), std::end(header.section_tables),
[](NCASectionTableEntry entry) { return entry.media_offset > 0; });
for (std::ptrdiff_t i = 0; i < number_sections; ++i) {
// Seek to beginning of this section.
NCASectionHeaderBlock block{};
if (sizeof(NCASectionHeaderBlock) !=
file->ReadObject(&block, SECTION_HEADER_OFFSET + i * SECTION_HEADER_SIZE))
LOG_CRITICAL(Loader, "File reader errored out during header read.");
if (block.filesystem_type == NCASectionFilesystemType::ROMFS) {
RomFSSuperblock sb{};
if (sizeof(RomFSSuperblock) !=
file->ReadObject(&sb, SECTION_HEADER_OFFSET + i * SECTION_HEADER_SIZE))
LOG_CRITICAL(Loader, "File reader errored out during header read.");
const size_t romfs_offset =
header.section_tables[i].media_offset * MEDIA_OFFSET_MULTIPLIER +
sb.ivfc.levels[IVFC_MAX_LEVEL - 1].offset;
const size_t romfs_size = sb.ivfc.levels[IVFC_MAX_LEVEL - 1].size;
files.emplace_back(std::make_shared<OffsetVfsFile>(file, romfs_size, romfs_offset));
romfs = files.back();
} else if (block.filesystem_type == NCASectionFilesystemType::PFS0) {
PFS0Superblock sb{};
// Seek back to beginning of this section.
if (sizeof(PFS0Superblock) !=
file->ReadObject(&sb, SECTION_HEADER_OFFSET + i * SECTION_HEADER_SIZE))
LOG_CRITICAL(Loader, "File reader errored out during header read.");
u64 offset = (static_cast<u64>(header.section_tables[i].media_offset) *
MEDIA_OFFSET_MULTIPLIER) +
sb.pfs0_header_offset;
u64 size = MEDIA_OFFSET_MULTIPLIER * (header.section_tables[i].media_end_offset -
header.section_tables[i].media_offset);
auto npfs = std::make_shared<PartitionFilesystem>(
std::make_shared<OffsetVfsFile>(file, size, offset));
if (npfs->GetStatus() == Loader::ResultStatus::Success) {
dirs.emplace_back(npfs);
if (IsDirectoryExeFS(dirs.back()))
exefs = dirs.back();
}
}
}
status = Loader::ResultStatus::Success;
}
Loader::ResultStatus NCA::GetStatus() const {
return status;
}
std::vector<std::shared_ptr<VfsFile>> NCA::GetFiles() const {
if (status != Loader::ResultStatus::Success)
return {};
return files;
}
std::vector<std::shared_ptr<VfsDirectory>> NCA::GetSubdirectories() const {
if (status != Loader::ResultStatus::Success)
return {};
return dirs;
}
std::string NCA::GetName() const {
return file->GetName();
}
std::shared_ptr<VfsDirectory> NCA::GetParentDirectory() const {
return file->GetContainingDirectory();
}
NCAContentType NCA::GetType() const {
return header.content_type;
}
u64 NCA::GetTitleId() const {
if (status != Loader::ResultStatus::Success)
return {};
return header.title_id;
}
VirtualFile NCA::GetRomFS() const {
return romfs;
}
VirtualDir NCA::GetExeFS() const {
return exefs;
}
bool NCA::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
return false;
}
} // namespace FileSys
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