test/md5_helper.h

/*
 * Copyright (c) 2016, Alliance for Open Media. All rights reserved.
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#ifndef AOM_TEST_MD5_HELPER_H_
#define AOM_TEST_MD5_HELPER_H_

#include "aom/aom_decoder.h"
#include "common/md5_utils.h"

namespace libaom_test {
class MD5 {
 public:
  MD5() { MD5Init(&md5_); }

  void Add(const aom_image_t *img) {
    for (int plane = 0; plane < 3; ++plane) {
      const uint8_t *buf = img->planes[plane];
      // Calculate the width and height to do the md5 check. For the chroma
      // plane, we never want to round down and thus skip a pixel so if
      // we are shifting by 1 (chroma_shift) we add 1 before doing the shift.
      // This works only for chroma_shift of 0 and 1.
      const int bytes_per_sample =
          (img->fmt & AOM_IMG_FMT_HIGHBITDEPTH) ? 2 : 1;
      const int h =
          plane ? (img->d_h + img->y_chroma_shift) >> img->y_chroma_shift
                : img->d_h;
      const int w =
          (plane ? (img->d_w + img->x_chroma_shift) >> img->x_chroma_shift
                 : img->d_w) *
          bytes_per_sample;

      for (int y = 0; y < h; ++y) {
        MD5Update(&md5_, buf, w);
        buf += img->stride[plane];
      }
    }
  }

  void Add(const uint8_t *data, size_t size) {
    MD5Update(&md5_, data, static_cast<uint32_t>(size));
  }

  const char *Get() {
    static const char hex[16] = {
      '0', '1', '2', '3', '4', '5', '6', '7',
      '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
    };
    uint8_t tmp[16];
    MD5Context ctx_tmp = md5_;

    MD5Final(tmp, &ctx_tmp);
    for (int i = 0; i < 16; i++) {
      res_[i * 2 + 0] = hex[tmp[i] >> 4];
      res_[i * 2 + 1] = hex[tmp[i] & 0xf];
    }
    res_[32] = 0;

    return res_;
  }

 protected:
  char res_[33];
  MD5Context md5_;
};

}  // namespace libaom_test

#endif  // AOM_TEST_MD5_HELPER_H_