mirror of
https://git.suyu.dev/suyu/suyu.git
synced 2024-11-27 13:56:27 -05:00
109 lines
3 KiB
C++
109 lines
3 KiB
C++
// 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/assert.h"
|
|
#include "core/file_sys/vfs_concat.h"
|
|
|
|
namespace FileSys {
|
|
|
|
bool VerifyConcatenationMap(std::map<u64, VirtualFile> map) {
|
|
for (auto iter = map.begin(); iter != --map.end();) {
|
|
const auto old = iter++;
|
|
if (old->first + old->second->GetSize() != iter->first) {
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return map.begin()->first == 0;
|
|
}
|
|
|
|
VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string name) {
|
|
if (files.empty())
|
|
return nullptr;
|
|
if (files.size() == 1)
|
|
return files[0];
|
|
|
|
return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), std::move(name)));
|
|
}
|
|
|
|
ConcatenatedVfsFile::ConcatenatedVfsFile(std::vector<VirtualFile> files_, std::string name)
|
|
: name(std::move(name)) {
|
|
std::size_t next_offset = 0;
|
|
for (const auto& file : files_) {
|
|
files[next_offset] = file;
|
|
next_offset += file->GetSize();
|
|
}
|
|
}
|
|
|
|
ConcatenatedVfsFile::ConcatenatedVfsFile(std::map<u64, VirtualFile> files_, std::string name)
|
|
: files(std::move(files_)), name(std::move(name)) {
|
|
ASSERT(VerifyConcatenationMap(files));
|
|
}
|
|
|
|
std::string ConcatenatedVfsFile::GetName() const {
|
|
if (files.empty())
|
|
return "";
|
|
if (!name.empty())
|
|
return name;
|
|
return files.begin()->second->GetName();
|
|
}
|
|
|
|
std::size_t ConcatenatedVfsFile::GetSize() const {
|
|
if (files.empty())
|
|
return 0;
|
|
return files.rbegin()->first + files.rbegin()->second->GetSize();
|
|
}
|
|
|
|
bool ConcatenatedVfsFile::Resize(std::size_t new_size) {
|
|
return false;
|
|
}
|
|
|
|
std::shared_ptr<VfsDirectory> ConcatenatedVfsFile::GetContainingDirectory() const {
|
|
if (files.empty())
|
|
return nullptr;
|
|
return files.begin()->second->GetContainingDirectory();
|
|
}
|
|
|
|
bool ConcatenatedVfsFile::IsWritable() const {
|
|
return false;
|
|
}
|
|
|
|
bool ConcatenatedVfsFile::IsReadable() const {
|
|
return true;
|
|
}
|
|
|
|
std::size_t ConcatenatedVfsFile::Read(u8* data, std::size_t length, std::size_t offset) const {
|
|
std::pair<u64, VirtualFile> entry = *files.rbegin();
|
|
for (auto iter = files.begin(); iter != files.end(); ++iter) {
|
|
if (iter->first > offset) {
|
|
entry = *--iter;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (entry.first + entry.second->GetSize() <= offset)
|
|
return 0;
|
|
|
|
const auto read_in =
|
|
std::min(entry.first + entry.second->GetSize() - offset, entry.second->GetSize());
|
|
if (length > read_in) {
|
|
return entry.second->Read(data, read_in, offset - entry.first) +
|
|
Read(data + read_in, length - read_in, offset + read_in);
|
|
}
|
|
|
|
return entry.second->Read(data, std::min(read_in, length), offset - entry.first);
|
|
}
|
|
|
|
std::size_t ConcatenatedVfsFile::Write(const u8* data, std::size_t length, std::size_t offset) {
|
|
return 0;
|
|
}
|
|
|
|
bool ConcatenatedVfsFile::Rename(std::string_view name) {
|
|
return false;
|
|
}
|
|
|
|
} // namespace FileSys
|