diff options
Diffstat (limited to 'src/core/file_sys/vfs_concat.cpp')
-rw-r--r-- | src/core/file_sys/vfs_concat.cpp | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/src/core/file_sys/vfs_concat.cpp b/src/core/file_sys/vfs_concat.cpp new file mode 100644 index 000000000..1d439e0a4 --- /dev/null +++ b/src/core/file_sys/vfs_concat.cpp @@ -0,0 +1,93 @@ +// Copyright 2018 yuzu emulator team +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include <algorithm> +#include <utility> + +#include "core/file_sys/vfs_concat.h" + +namespace FileSys { + +VirtualFile ConcatenateFiles(std::vector<VirtualFile> files, std::string_view name) { + if (files.empty()) + return nullptr; + if (files.size() == 1) + return files[0]; + + return std::shared_ptr<VfsFile>(new ConcatenatedVfsFile(std::move(files), name)); +} + +ConcatenatedVfsFile::ConcatenatedVfsFile(std::vector<VirtualFile> files_, std::string_view name) + : name(name) { + size_t next_offset = 0; + for (const auto& file : files_) { + files[next_offset] = file; + next_offset += file->GetSize(); + } +} + +std::string ConcatenatedVfsFile::GetName() const { + if (files.empty()) + return ""; + if (!name.empty()) + return name; + return files.begin()->second->GetName(); +} + +size_t ConcatenatedVfsFile::GetSize() const { + if (files.empty()) + return 0; + return files.rbegin()->first + files.rbegin()->second->GetSize(); +} + +bool ConcatenatedVfsFile::Resize(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; +} + +size_t ConcatenatedVfsFile::Read(u8* data, size_t length, size_t offset) const { + auto entry = files.end(); + for (auto iter = files.begin(); iter != files.end(); ++iter) { + if (iter->first > offset) { + entry = --iter; + break; + } + } + + if (entry == files.end() && offset < files.rbegin()->first + files.rbegin()->second->GetSize()) + --entry; + + if (entry == files.end()) + return 0; + + const auto remaining = entry->second->GetSize() + offset - entry->first; + if (length > remaining) { + return entry->second->Read(data, remaining, offset - entry->first) + + Read(data + remaining, length - remaining, offset + remaining); + } + + return entry->second->Read(data, length, offset - entry->first); +} + +size_t ConcatenatedVfsFile::Write(const u8* data, size_t length, size_t offset) { + return 0; +} + +bool ConcatenatedVfsFile::Rename(std::string_view name) { + return false; +} +} // namespace FileSys |