14e2df5610
This converts it into a regular constructor parameter. There's no need to make this a template parameter on the class when it functions perfectly well as a constructor argument. This also reduces the amount of code bloat produced by the compiler, as it doesn't need to generate the same code for multiple different instantiations of the same class type, but with a different fill value.
136 lines
4.1 KiB
C++
136 lines
4.1 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::map<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[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::map<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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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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VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, 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 ConcatenateFiles(u8 filler_byte, std::map<u64, VirtualFile> files, 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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} // namespace FileSys
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