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/*
* libfud
* Copyright 2024 Dominick Allen
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "fud_c_file.hpp"
namespace fud {
CBinaryFile::CBinaryFile(const String& filename, CFileMode mode)
: m_filename{filename},
m_mode{CBinaryFileModeFromFlags(mode)},
m_modeFlags{mode}
{
}
CBinaryFile::CBinaryFile(const String& filename, CFileMode mode, const String& extraFlags)
: m_filename{filename},
m_extraFlags{extraFlags},
m_mode{String(CBinaryFileModeFromFlags(mode)).catenate(extraFlags)},
m_modeFlags{mode}
{
}
CBinaryFile::~CBinaryFile() {
close();
}
FileStatus CBinaryFile::open()
{
if (!m_filename.valid()) {
return FileStatus::InvalidName;
}
m_file = fopen(m_filename.c_str(), m_mode.c_str());
return m_file != nullptr ? FileStatus::Success : FileStatus::Error;
}
void CBinaryFile::close()
{
if (m_file != nullptr) {
fclose(m_file);
m_file = nullptr;
}
}
const FILE* CBinaryFile::file() const
{
return m_file;
}
FILE* CBinaryFile::file()
{
return m_file;
}
bool CBinaryFile::isOpen() const
{
return m_file != nullptr;
}
Result<size_t, FileStatus> CBinaryFile::size() const
{
using RetType = Result<size_t, FileStatus>;
if (!isOpen()) {
return RetType::error(FileStatus::InvalidState);
}
auto seekStatus = fseek(m_file, 0, SEEK_END);
if (seekStatus != 0) {
return RetType::error(FileStatus::Error);
}
auto fileSizeResult = ftell(m_file);
if (fileSizeResult < 0) {
return RetType::error(FileStatus::Error);
}
auto fileSize = static_cast<size_t>(fileSizeResult);
auto resetStatus = reset();
if (resetStatus != FileStatus::Success) {
return RetType::error(resetStatus);
}
return RetType::okay(fileSize);
}
ReadResult CBinaryFile::read(void* destination, size_t destinationSize, size_t length)
{
return read(destination, destinationSize, length, 0);
}
ReadResult CBinaryFile::read(void* destination, size_t destinationSize, size_t length, size_t offset)
{
ReadResult result{};
if (length == 0) {
return result;
}
if (destination == nullptr) {
result.status = FileStatus::NullPointer;
return result;
}
if (offset > LONG_MAX || SIZE_MAX - offset < length || destinationSize < length) {
result.status = FileStatus::InvalidArgument;
return result;
}
auto fileSizeResult = size();
if (fileSizeResult.isError()) {
result.status = fileSizeResult.getError();
return result;
}
auto fileSize = fileSizeResult.getOkay();
if (offset + length > fileSize) {
result.status = FileStatus::InvalidArgument;
return result;
}
auto seekResult = fseek(m_file, static_cast<long>(offset), SEEK_SET);
if (seekResult != 0) {
result.status = FileStatus::Error;
return result;
}
auto* destBytes = static_cast<char*>(destination);
result.bytesRead = fread(destBytes, 1, length, m_file);
static_cast<void>(reset());
if (result.bytesRead != length) {
result.status = FileStatus::PartialSuccess;
} else {
result.status = FileStatus::Success;
}
return result;
}
WriteResult CBinaryFile::write(const void* source, size_t sourceSize, size_t length)
{
auto offsetResult = size();
if (offsetResult.isError()) {
return WriteResult{0, offsetResult.getError()};
}
return write(source, sourceSize, length, offsetResult.getOkay());
}
WriteResult CBinaryFile::write(const void* source, size_t sourceSize, size_t length, size_t offset)
{
WriteResult result{};
if (length == 0) {
return result;
}
if (source == nullptr) {
result.status = FileStatus::NullPointer;
return result;
}
if (offset > LONG_MAX || SIZE_MAX - offset < length || sourceSize < length) {
result.status = FileStatus::InvalidArgument;
return result;
}
auto fileSizeResult = size();
if (fileSizeResult.isError()) {
result.status = fileSizeResult.getError();
return result;
}
// TODO: proper way of handling this
auto fileSize = fileSizeResult.getOkay();
int seekResult;
if (offset > fileSize) {
seekResult = fseek(m_file, 0, SEEK_END);
} else {
seekResult = fseek(m_file, static_cast<long>(offset), SEEK_SET);
}
if (seekResult != 0) {
result.status = FileStatus::Error;
return result;
}
auto* sourceBytes = static_cast<const char*>(source);
result.bytesWritten = fwrite(sourceBytes, 1, length, m_file);
static_cast<void>(reset());
if (result.bytesWritten != length) {
result.status = FileStatus::PartialSuccess;
} else {
result.status = FileStatus::Success;
}
return result;
}
FileStatus CBinaryFile::reset() const {
if (!isOpen()) {
return FileStatus::InvalidState;
}
auto result = fseek(m_file, 0, SEEK_SET);
return result == 0 ? FileStatus::Success : FileStatus::Error;
}
} // namespace fud
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