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#ifndef IMAGE_IO_UTILS_FILE_UTILS_H_ // NOLINT
#define IMAGE_IO_UTILS_FILE_UTILS_H_ // NOLINT
#include <iostream>
#include <memory>
#include <string>
#include "image_io/base/data_segment.h"
namespace photos_editing_formats {
namespace image_io {
/// A policy that controls whether an error is reported or not.
enum class ReportErrorPolicy { kDontReportError, kReportError };
/// @param file_name The name of the file to get the size in bytes of.
/// @param size A pointer to a variable to receive the size.
/// @return Whether file size was obtained properly.
bool GetFileSize(const std::string& file_name, size_t* size);
/// @param file_name The name of the file to open for output.
/// @return An ostream pointer or nullptr if the open failed.
std::unique_ptr<std::ostream> OpenOutputFile(
const std::string& file_name, ReportErrorPolicy report_error_policy);
/// @param file_name The name of the file to open for input.
/// @return An istream pointer or nullptr if the open failed.
std::unique_ptr<std::istream> OpenInputFile(
const std::string& file_name, ReportErrorPolicy report_error_policy);
/// Opens the named file for input, gets its size, and reads the entire contents
/// into a data segment that is returned to the caller.
/// @param file_name The name of the file to open for input.
/// @return A DataSegment pointer or nullptr if the open and reading failed.
std::shared_ptr<DataSegment> ReadEntireFile(
const std::string& file_name, ReportErrorPolicy report_error_policy);
} // namespace image_io
} // namespace photos_editing_formats
#endif // IMAGE_IO_UTILS_FILE_UTILS_H_ // NOLINT
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