test/md5_helper.h

   1 /*
   2  *  Copyright (c) 2012 The WebM project authors. All Rights Reserved.
   3  *
   4  *  Use of this source code is governed by a BSD-style license
   5  *  that can be found in the LICENSE file in the root of the source
   6  *  tree. An additional intellectual property rights grant can be found
   7  *  in the file PATENTS.  All contributing project authors may
   8  *  be found in the AUTHORS file in the root of the source tree.
   9  */
  10
  11 #ifndef TEST_MD5_HELPER_H_
  12 #define TEST_MD5_HELPER_H_
  13
  14 #include "./md5_utils.h"
  15 #include "vpx/vpx_decoder.h"
  16
  17 namespace libvpx_test {
  18 class MD5 {
  19  public:
  20   MD5() {
  21     MD5Init(&md5_);
  22   }
  23
  24   void Add(const vpx_image_t *img) {
  25     for (int plane = 0; plane < 3; ++plane) {
  26       const uint8_t *buf = img->planes[plane];
  27       // Calculate the width and height to do the md5 check. For the chroma
  28       // plane, we never want to round down and thus skip a pixel so if
  29       // we are shifting by 1 (chroma_shift) we add 1 before doing the shift.
  30       // This works only for chroma_shift of 0 and 1.
  31       const int bytes_per_sample =
  32           (img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 2 : 1;
  33       const int h = plane ? (img->d_h + img->y_chroma_shift) >>
  34                     img->y_chroma_shift : img->d_h;
  35       const int w = (plane ? (img->d_w + img->x_chroma_shift) >>
  36                      img->x_chroma_shift : img->d_w) * bytes_per_sample;
  37
  38       for (int y = 0; y < h; ++y) {
  39         MD5Update(&md5_, buf, w);
  40         buf += img->stride[plane];
  41       }
  42     }
  43   }
  44
  45   void Add(const uint8_t *data, size_t size) {
  46     MD5Update(&md5_, data, static_cast<uint32_t>(size));
  47   }
  48
  49   const char *Get(void) {
  50     static const char hex[16] = {
  51       '0', '1', '2', '3', '4', '5', '6', '7',
  52       '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
  53     };
  54     uint8_t tmp[16];
  55     MD5Context ctx_tmp = md5_;
  56
  57     MD5Final(tmp, &ctx_tmp);
  58     for (int i = 0; i < 16; i++) {
  59       res_[i * 2 + 0]  = hex[tmp[i] >> 4];
  60       res_[i * 2 + 1]  = hex[tmp[i] & 0xf];
  61     }
  62     res_[32] = 0;
  63
  64     return res_;
  65   }
  66
  67  protected:
  68   char res_[33];
  69   MD5Context md5_;
  70 };
  71
  72 }  // namespace libvpx_test
  73
  74 #endif  // TEST_MD5_HELPER_H_