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// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include "common/overflow.h"
#include "core/file_sys/errors.h"
#include "core/file_sys/fs_file.h"
#include "core/file_sys/fs_filesystem.h"
#include "core/file_sys/fs_operate_range.h"
#include "core/file_sys/vfs/vfs.h"
#include "core/file_sys/vfs/vfs_types.h"
#include "core/hle/result.h"
namespace FileSys::Fsa {
class IFile {
public:
explicit IFile(VirtualFile backend_) : backend(std::move(backend_)) {}
virtual ~IFile() {}
Result Read(size_t* out, s64 offset, void* buffer, size_t size, const ReadOption& option) {
// Check that we have an output pointer
R_UNLESS(out != nullptr, ResultNullptrArgument);
// If we have nothing to read, just succeed
if (size == 0) {
*out = 0;
R_SUCCEED();
}
// Check that the read is valid
R_UNLESS(buffer != nullptr, ResultNullptrArgument);
R_UNLESS(offset >= 0, ResultOutOfRange);
R_UNLESS(Common::CanAddWithoutOverflow<s64>(offset, size), ResultOutOfRange);
// Do the read
R_RETURN(this->DoRead(out, offset, buffer, size, option));
}
Result Read(size_t* out, s64 offset, void* buffer, size_t size) {
R_RETURN(this->Read(out, offset, buffer, size, ReadOption::None));
}
Result GetSize(s64* out) {
R_UNLESS(out != nullptr, ResultNullptrArgument);
R_RETURN(this->DoGetSize(out));
}
Result Flush() {
R_RETURN(this->DoFlush());
}
Result Write(s64 offset, const void* buffer, size_t size, const WriteOption& option) {
// Handle the zero-size case
if (size == 0) {
if (option.HasFlushFlag()) {
R_TRY(this->Flush());
}
R_SUCCEED();
}
// Check the write is valid
R_UNLESS(buffer != nullptr, ResultNullptrArgument);
R_UNLESS(offset >= 0, ResultOutOfRange);
R_UNLESS(Common::CanAddWithoutOverflow<s64>(offset, size), ResultOutOfRange);
R_RETURN(this->DoWrite(offset, buffer, size, option));
}
Result SetSize(s64 size) {
R_UNLESS(size >= 0, ResultOutOfRange);
R_RETURN(this->DoSetSize(size));
}
Result OperateRange(void* dst, size_t dst_size, OperationId op_id, s64 offset, s64 size,
const void* src, size_t src_size) {
R_RETURN(this->DoOperateRange(dst, dst_size, op_id, offset, size, src, src_size));
}
Result OperateRange(OperationId op_id, s64 offset, s64 size) {
R_RETURN(this->DoOperateRange(nullptr, 0, op_id, offset, size, nullptr, 0));
}
protected:
Result DryRead(size_t* out, s64 offset, size_t size, const ReadOption& option,
OpenMode open_mode) {
// Check that we can read
R_UNLESS(static_cast<u32>(open_mode & OpenMode::Read) != 0, ResultReadNotPermitted);
// Get the file size, and validate our offset
s64 file_size = 0;
R_TRY(this->DoGetSize(std::addressof(file_size)));
R_UNLESS(offset <= file_size, ResultOutOfRange);
*out = static_cast<size_t>(std::min(file_size - offset, static_cast<s64>(size)));
R_SUCCEED();
}
Result DrySetSize(s64 size, OpenMode open_mode) {
// Check that we can write
R_UNLESS(static_cast<u32>(open_mode & OpenMode::Write) != 0, ResultWriteNotPermitted);
R_SUCCEED();
}
Result DryWrite(bool* out_append, s64 offset, size_t size, const WriteOption& option,
OpenMode open_mode) {
// Check that we can write
R_UNLESS(static_cast<u32>(open_mode & OpenMode::Write) != 0, ResultWriteNotPermitted);
// Get the file size
s64 file_size = 0;
R_TRY(this->DoGetSize(&file_size));
// Determine if we need to append
*out_append = false;
if (file_size < offset + static_cast<s64>(size)) {
R_UNLESS(static_cast<u32>(open_mode & OpenMode::AllowAppend) != 0,
ResultFileExtensionWithoutOpenModeAllowAppend);
*out_append = true;
}
R_SUCCEED();
}
private:
Result DoRead(size_t* out, s64 offset, void* buffer, size_t size, const ReadOption& option) {
const auto read_size = backend->Read(static_cast<u8*>(buffer), size, offset);
*out = read_size;
R_SUCCEED();
}
Result DoGetSize(s64* out) {
*out = backend->GetSize();
R_SUCCEED();
}
Result DoFlush() {
// Exists for SDK compatibiltity -- No need to flush file.
R_SUCCEED();
}
Result DoWrite(s64 offset, const void* buffer, size_t size, const WriteOption& option) {
const std::size_t written = backend->Write(static_cast<const u8*>(buffer), size, offset);
ASSERT_MSG(written == size,
"Could not write all bytes to file (requested={:016X}, actual={:016X}).", size,
written);
R_SUCCEED();
}
Result DoSetSize(s64 size) {
backend->Resize(size);
R_SUCCEED();
}
Result DoOperateRange(void* dst, size_t dst_size, OperationId op_id, s64 offset, s64 size,
const void* src, size_t src_size) {
R_THROW(ResultNotImplemented);
}
VirtualFile backend;
};
} // namespace FileSys::Fsa
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