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#include "image_io/utils/file_utils.h"
#include <sys/stat.h>
#import <fstream>
#import <iostream>
#import <memory>
#include "image_io/base/data_range.h"
namespace photos_editing_formats {
namespace image_io {
using std::fstream;
using std::istream;
using std::ostream;
using std::unique_ptr;
bool GetFileSize(const std::string& file_name, size_t* size) {
struct stat stat_buf;
if (stat(file_name.c_str(), &stat_buf)) {
return false;
} else {
if (size) {
*size = stat_buf.st_size;
}
return true;
}
}
unique_ptr<ostream> OpenOutputFile(const std::string& file_name,
MessageHandler* message_handler) {
auto* file_stream = new fstream(file_name, std::ios::out | std::ios::binary);
if (file_stream && !file_stream->is_open()) {
delete file_stream;
file_stream = nullptr;
if (message_handler) {
message_handler->ReportMessage(Message::kStdLibError, file_name);
}
}
return unique_ptr<ostream>(file_stream);
}
unique_ptr<istream> OpenInputFile(const std::string& file_name,
MessageHandler* message_handler) {
auto* file_stream = new fstream(file_name, std::ios::in | std::ios::binary);
if (file_stream && !file_stream->is_open()) {
delete file_stream;
file_stream = nullptr;
if (message_handler) {
message_handler->ReportMessage(Message::kStdLibError, file_name);
}
}
return unique_ptr<istream>(file_stream);
}
std::shared_ptr<DataSegment> ReadEntireFile(const std::string& file_name,
MessageHandler* message_handler) {
size_t buffer_size = 0;
std::shared_ptr<DataSegment> shared_data_segment;
if (GetFileSize(file_name, &buffer_size)) {
unique_ptr<istream> shared_istream =
OpenInputFile(file_name, message_handler);
if (shared_istream) {
Byte* buffer = new Byte[buffer_size];
if (buffer) {
shared_data_segment =
DataSegment::Create(DataRange(0, buffer_size), buffer);
shared_istream->read(reinterpret_cast<char*>(buffer), buffer_size);
size_t bytes_read = shared_istream->tellg();
if (bytes_read != buffer_size) {
shared_data_segment.reset();
}
}
}
}
if (!shared_data_segment && message_handler) {
message_handler->ReportMessage(Message::kStdLibError, file_name);
}
return shared_data_segment;
}
} // namespace image_io
} // namespace photos_editing_formats
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