1 files changed, 41 insertions, 0 deletions
diff --git a/includes/image_io/utils/file_utils.h b/includes/image_io/utils/file_utils.h
new file mode 100644
index 0000000..d1a469d
--- /dev/null
+++ b/includes/image_io/utils/file_utils.h
@@ -0,0 +1,41 @@
+#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