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Merge pull request #341 from shinyquagsire23/pfs-hfs-impl

file_sys: Add HFS/PFS helper component
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bunnei 2018-04-17 14:39:20 -04:00 committed by GitHub
commit 5b9bcbf438
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3 changed files with 214 additions and 0 deletions

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@ -12,6 +12,8 @@ add_library(core STATIC
file_sys/errors.h
file_sys/filesystem.cpp
file_sys/filesystem.h
file_sys/partition_filesystem.cpp
file_sys/partition_filesystem.h
file_sys/path_parser.cpp
file_sys/path_parser.h
file_sys/program_metadata.cpp

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@ -0,0 +1,125 @@
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <cinttypes>
#include <utility>
#include "common/file_util.h"
#include "common/logging/log.h"
#include "core/file_sys/partition_filesystem.h"
#include "core/loader/loader.h"
namespace FileSys {
Loader::ResultStatus PartitionFilesystem::Load(const std::string& file_path, size_t offset) {
FileUtil::IOFile file(file_path, "rb");
if (!file.IsOpen())
return Loader::ResultStatus::Error;
// At least be as large as the header
if (file.GetSize() < sizeof(Header))
return Loader::ResultStatus::Error;
// For cartridges, HFSs can get very large, so we need to calculate the size up to
// the actual content itself instead of just blindly reading in the entire file.
Header pfs_header;
if (!file.ReadBytes(&pfs_header, sizeof(Header)))
return Loader::ResultStatus::Error;
bool is_hfs = (memcmp(pfs_header.magic.data(), "HFS", 3) == 0);
size_t entry_size = is_hfs ? sizeof(HFSEntry) : sizeof(PFSEntry);
size_t metadata_size =
sizeof(Header) + (pfs_header.num_entries * entry_size) + pfs_header.strtab_size;
// Actually read in now...
file.Seek(offset, SEEK_SET);
std::vector<u8> file_data(metadata_size);
if (!file.ReadBytes(file_data.data(), metadata_size))
return Loader::ResultStatus::Error;
Loader::ResultStatus result = Load(file_data);
if (result != Loader::ResultStatus::Success)
LOG_ERROR(Service_FS, "Failed to load PFS from file %s!", file_path.c_str());
return result;
}
Loader::ResultStatus PartitionFilesystem::Load(const std::vector<u8>& file_data, size_t offset) {
size_t total_size = file_data.size() - offset;
if (total_size < sizeof(Header))
return Loader::ResultStatus::Error;
memcpy(&pfs_header, &file_data[offset], sizeof(Header));
is_hfs = (memcmp(pfs_header.magic.data(), "HFS", 3) == 0);
size_t entries_offset = offset + sizeof(Header);
size_t entry_size = is_hfs ? sizeof(HFSEntry) : sizeof(PFSEntry);
size_t strtab_offset = entries_offset + (pfs_header.num_entries * entry_size);
for (u16 i = 0; i < pfs_header.num_entries; i++) {
FileEntry entry;
memcpy(&entry.fs_entry, &file_data[entries_offset + (i * entry_size)], sizeof(FSEntry));
entry.name = std::string(reinterpret_cast<const char*>(
&file_data[strtab_offset + entry.fs_entry.strtab_offset]));
pfs_entries.push_back(std::move(entry));
}
content_offset = strtab_offset + pfs_header.strtab_size;
return Loader::ResultStatus::Success;
}
u32 PartitionFilesystem::GetNumEntries() const {
return pfs_header.num_entries;
}
u64 PartitionFilesystem::GetEntryOffset(int index) const {
if (index > GetNumEntries())
return 0;
return content_offset + pfs_entries[index].fs_entry.offset;
}
u64 PartitionFilesystem::GetEntrySize(int index) const {
if (index > GetNumEntries())
return 0;
return pfs_entries[index].fs_entry.size;
}
std::string PartitionFilesystem::GetEntryName(int index) const {
if (index > GetNumEntries())
return "";
return pfs_entries[index].name;
}
u64 PartitionFilesystem::GetFileOffset(const std::string& name) const {
for (u32 i = 0; i < pfs_header.num_entries; i++) {
if (pfs_entries[i].name == name)
return content_offset + pfs_entries[i].fs_entry.offset;
}
return 0;
}
u64 PartitionFilesystem::GetFileSize(const std::string& name) const {
for (u32 i = 0; i < pfs_header.num_entries; i++) {
if (pfs_entries[i].name == name)
return pfs_entries[i].fs_entry.size;
}
return 0;
}
void PartitionFilesystem::Print() const {
NGLOG_DEBUG(Service_FS, "Magic: {:.4}", pfs_header.magic.data());
NGLOG_DEBUG(Service_FS, "Files: {}", pfs_header.num_entries);
for (u32 i = 0; i < pfs_header.num_entries; i++) {
NGLOG_DEBUG(Service_FS, " > File {}: {} (0x{:X} bytes, at 0x{:X})", i,
pfs_entries[i].name.c_str(), pfs_entries[i].fs_entry.size,
GetFileOffset(pfs_entries[i].name));
}
}
} // namespace FileSys

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@ -0,0 +1,87 @@
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <string>
#include <vector>
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "common/swap.h"
namespace Loader {
enum class ResultStatus;
}
namespace FileSys {
/**
* Helper which implements an interface to parse PFS/HFS filesystems.
* Data can either be loaded from a file path or data with an offset into it.
*/
class PartitionFilesystem {
public:
Loader::ResultStatus Load(const std::string& file_path, size_t offset = 0);
Loader::ResultStatus Load(const std::vector<u8>& file_data, size_t offset = 0);
u32 GetNumEntries() const;
u64 GetEntryOffset(int index) const;
u64 GetEntrySize(int index) const;
std::string GetEntryName(int index) const;
u64 GetFileOffset(const std::string& name) const;
u64 GetFileSize(const std::string& name) const;
void Print() const;
private:
struct Header {
std::array<char, 4> magic;
u32_le num_entries;
u32_le strtab_size;
INSERT_PADDING_BYTES(0x4);
};
static_assert(sizeof(Header) == 0x10, "PFS/HFS header structure size is wrong");
#pragma pack(push, 1)
struct FSEntry {
u64_le offset;
u64_le size;
u32_le strtab_offset;
};
static_assert(sizeof(FSEntry) == 0x14, "FS entry structure size is wrong");
struct PFSEntry {
FSEntry fs_entry;
INSERT_PADDING_BYTES(0x4);
};
static_assert(sizeof(PFSEntry) == 0x18, "PFS entry structure size is wrong");
struct HFSEntry {
FSEntry fs_entry;
u32_le hash_region_size;
INSERT_PADDING_BYTES(0x8);
std::array<char, 0x20> hash;
};
static_assert(sizeof(HFSEntry) == 0x40, "HFS entry structure size is wrong");
#pragma pack(pop)
struct FileEntry {
FSEntry fs_entry;
std::string name;
};
Header pfs_header;
bool is_hfs;
size_t content_offset;
std::vector<FileEntry> pfs_entries;
};
} // namespace FileSys