enc_jpeg_data_reader.h

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// Copyright (c) the JPEG XL Project Authors. All rights reserved.

//

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Functions for reading a jpeg byte stream into a JPEGData object.

#ifndef LIB_JXL_JPEG_ENC_JPEG_DATA_READER_H_

#define LIB_JXL_JPEG_ENC_JPEG_DATA_READER_H_

#include <stddef.h>

#include <stdint.h>

#include "lib/jxl/jpeg/jpeg_data.h"

namespace jxl {

namespace jpeg {

enum class JpegReadMode {

  kReadHeader,  // only basic headers

  kReadTables,  // headers and tables (quant, Huffman, ...)

  kReadAll,     // everything

};

// Parses the JPEG stream contained in data[*pos ... len) and fills in *jpg with

// the parsed information.

// If mode is kReadHeader, it fills in only the image dimensions in *jpg.

// Returns false if the data is not valid JPEG, or if it contains an unsupported

// JPEG feature.

bool ReadJpeg(const uint8_t* data, size_t len, JpegReadMode mode,

              JPEGData* jpg);

}  // namespace jpeg

}  // namespace jxl

#endif  // LIB_JXL_JPEG_ENC_JPEG_DATA_READER_H_