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fd1c3aa14e
When zero byte files are present, the key (offset) for that file is identical to the file right after. A std::map isn't able to fit key-value pairs with identical keys (offsets), therefore, the solution is to use std::multimap which permits multiple entries with the same key. This most prominently fixes Pokemon Sword and Shield weather with any RomFS mod applied.
140 lines
4.4 KiB
C++
140 lines
4.4 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 <utility>
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#include "common/assert.h"
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#include "core/file_sys/vfs_concat.h"
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#include "core/file_sys/vfs_static.h"
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namespace FileSys {
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static bool VerifyConcatenationMapContinuity(const std::multimap<u64, VirtualFile>& map) {
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const auto last_valid = --map.end();
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for (auto iter = map.begin(); iter != last_valid;) {
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const auto old = iter++;
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if (old->first + old->second->GetSize() != iter->first) {
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return false;
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}
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}
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return map.begin()->first == 0;
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}
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ConcatenatedVfsFile::ConcatenatedVfsFile(std::vector<VirtualFile> files_, std::string name)
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: name(std::move(name)) {
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std::size_t next_offset = 0;
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for (const auto& file : files_) {
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files.emplace(next_offset, file);
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next_offset += file->GetSize();
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}
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}
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ConcatenatedVfsFile::ConcatenatedVfsFile(std::multimap<u64, VirtualFile> files_, std::string name)
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: files(std::move(files_)), name(std::move(name)) {
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ASSERT(VerifyConcatenationMapContinuity(files));
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}
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ConcatenatedVfsFile::~ConcatenatedVfsFile() = default;
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VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(std::vector<VirtualFile> files,
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std::string name) {
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if (files.empty())
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return nullptr;
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if (files.size() == 1)
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return files[0];
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return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
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}
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VirtualFile ConcatenatedVfsFile::MakeConcatenatedFile(u8 filler_byte,
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std::multimap<u64, VirtualFile> files,
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std::string name) {
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if (files.empty())
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return nullptr;
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if (files.size() == 1)
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return files.begin()->second;
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const auto last_valid = --files.end();
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for (auto iter = files.begin(); iter != last_valid;) {
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const auto old = iter++;
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if (old->first + old->second->GetSize() != iter->first) {
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files.emplace(old->first + old->second->GetSize(),
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std::make_shared<StaticVfsFile>(filler_byte, iter->first - old->first -
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old->second->GetSize()));
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}
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}
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// Ensure the map starts at offset 0 (start of file), otherwise pad to fill.
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if (files.begin()->first != 0)
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files.emplace(0, std::make_shared<StaticVfsFile>(filler_byte, files.begin()->first));
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return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
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}
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std::string ConcatenatedVfsFile::GetName() const {
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if (files.empty())
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return "";
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if (!name.empty())
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return name;
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return files.begin()->second->GetName();
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}
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std::size_t ConcatenatedVfsFile::GetSize() const {
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if (files.empty())
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return 0;
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return files.rbegin()->first + files.rbegin()->second->GetSize();
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}
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bool ConcatenatedVfsFile::Resize(std::size_t new_size) {
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return false;
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}
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std::shared_ptr<VfsDirectory> ConcatenatedVfsFile::GetContainingDirectory() const {
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if (files.empty())
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return nullptr;
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return files.begin()->second->GetContainingDirectory();
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}
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bool ConcatenatedVfsFile::IsWritable() const {
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return false;
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}
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bool ConcatenatedVfsFile::IsReadable() const {
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return true;
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}
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std::size_t ConcatenatedVfsFile::Read(u8* data, std::size_t length, std::size_t offset) const {
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auto entry = --files.end();
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for (auto iter = files.begin(); iter != files.end(); ++iter) {
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if (iter->first > offset) {
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entry = --iter;
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break;
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}
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}
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if (entry->first + entry->second->GetSize() <= offset)
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return 0;
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const auto read_in =
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std::min<u64>(entry->first + entry->second->GetSize() - offset, entry->second->GetSize());
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if (length > read_in) {
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return entry->second->Read(data, read_in, offset - entry->first) +
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Read(data + read_in, length - read_in, offset + read_in);
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}
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return entry->second->Read(data, std::min<u64>(read_in, length), offset - entry->first);
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}
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std::size_t ConcatenatedVfsFile::Write(const u8* data, std::size_t length, std::size_t offset) {
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return 0;
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}
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bool ConcatenatedVfsFile::Rename(std::string_view name) {
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return false;
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}
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} // namespace FileSys
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