57c4d7aa00
We shouldn't be upcasting our file instances. Given a PartitionFilesystem is currently designed to accept any arbitrary VfsFile instances, casting to a more specific type than that is just bad design, and shows an interface design issue.
119 lines
3.8 KiB
C++
119 lines
3.8 KiB
C++
// Copyright 2018 yuzu emulator team
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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 <algorithm>
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#include <cstddef>
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#include <cstring>
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#include <iterator>
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#include <utility>
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#include "common/file_util.h"
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#include "common/logging/log.h"
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#include "core/file_sys/partition_filesystem.h"
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#include "core/file_sys/vfs_offset.h"
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#include "core/loader/loader.h"
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namespace FileSys {
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bool PartitionFilesystem::Header::HasValidMagicValue() const {
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return magic == Common::MakeMagic('H', 'F', 'S', '0') ||
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magic == Common::MakeMagic('P', 'F', 'S', '0');
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}
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PartitionFilesystem::PartitionFilesystem(std::shared_ptr<VfsFile> file) {
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// At least be as large as the header
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if (file->GetSize() < sizeof(Header)) {
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status = Loader::ResultStatus::Error;
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return;
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}
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// For cartridges, HFSs can get very large, so we need to calculate the size up to
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// the actual content itself instead of just blindly reading in the entire file.
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if (sizeof(Header) != file->ReadObject(&pfs_header)) {
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status = Loader::ResultStatus::Error;
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return;
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}
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if (!pfs_header.HasValidMagicValue()) {
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status = Loader::ResultStatus::ErrorInvalidFormat;
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return;
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}
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is_hfs = pfs_header.magic == Common::MakeMagic('H', 'F', 'S', '0');
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size_t entry_size = is_hfs ? sizeof(HFSEntry) : sizeof(PFSEntry);
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size_t metadata_size =
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sizeof(Header) + (pfs_header.num_entries * entry_size) + pfs_header.strtab_size;
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// Actually read in now...
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std::vector<u8> file_data = file->ReadBytes(metadata_size);
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const size_t total_size = file_data.size();
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if (total_size != metadata_size) {
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status = Loader::ResultStatus::Error;
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return;
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}
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size_t entries_offset = sizeof(Header);
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size_t strtab_offset = entries_offset + (pfs_header.num_entries * entry_size);
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content_offset = strtab_offset + pfs_header.strtab_size;
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for (u16 i = 0; i < pfs_header.num_entries; i++) {
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FSEntry entry;
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memcpy(&entry, &file_data[entries_offset + (i * entry_size)], sizeof(FSEntry));
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std::string name(
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reinterpret_cast<const char*>(&file_data[strtab_offset + entry.strtab_offset]));
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pfs_files.emplace_back(std::make_shared<OffsetVfsFile>(
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file, entry.size, content_offset + entry.offset, std::move(name)));
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}
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status = Loader::ResultStatus::Success;
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}
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Loader::ResultStatus PartitionFilesystem::GetStatus() const {
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return status;
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}
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std::vector<std::shared_ptr<VfsFile>> PartitionFilesystem::GetFiles() const {
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return pfs_files;
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}
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std::vector<std::shared_ptr<VfsDirectory>> PartitionFilesystem::GetSubdirectories() const {
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return pfs_dirs;
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}
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std::string PartitionFilesystem::GetName() const {
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return is_hfs ? "HFS0" : "PFS0";
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}
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std::shared_ptr<VfsDirectory> PartitionFilesystem::GetParentDirectory() const {
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// TODO(DarkLordZach): Add support for nested containers.
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return nullptr;
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}
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void PartitionFilesystem::PrintDebugInfo() const {
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LOG_DEBUG(Service_FS, "Magic: {:.4}", pfs_header.magic);
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LOG_DEBUG(Service_FS, "Files: {}", pfs_header.num_entries);
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for (u32 i = 0; i < pfs_header.num_entries; i++) {
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LOG_DEBUG(Service_FS, " > File {}: {} (0x{:X} bytes)", i,
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pfs_files[i]->GetName(), pfs_files[i]->GetSize());
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}
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}
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bool PartitionFilesystem::ReplaceFileWithSubdirectory(VirtualFile file, VirtualDir dir) {
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const auto iter = std::find(pfs_files.begin(), pfs_files.end(), file);
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if (iter == pfs_files.end())
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return false;
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const std::ptrdiff_t offset = std::distance(pfs_files.begin(), iter);
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pfs_files[offset] = std::move(pfs_files.back());
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pfs_files.pop_back();
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pfs_dirs.emplace_back(std::move(dir));
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return true;
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}
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} // namespace FileSys
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