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      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() { MD5Init(&md5_); }
     21 
     22   void Add(const vpx_image_t *img) {
     23     for (int plane = 0; plane < 3; ++plane) {
     24       const uint8_t *buf = img->planes[plane];
     25       // Calculate the width and height to do the md5 check. For the chroma
     26       // plane, we never want to round down and thus skip a pixel so if
     27       // we are shifting by 1 (chroma_shift) we add 1 before doing the shift.
     28       // This works only for chroma_shift of 0 and 1.
     29       const int bytes_per_sample =
     30           (img->fmt & VPX_IMG_FMT_HIGHBITDEPTH) ? 2 : 1;
     31       const int h =
     32           plane ? (img->d_h + img->y_chroma_shift) >> img->y_chroma_shift
     33                 : img->d_h;
     34       const int w =
     35           (plane ? (img->d_w + img->x_chroma_shift) >> img->x_chroma_shift
     36                  : img->d_w) *
     37           bytes_per_sample;
     38 
     39       for (int y = 0; y < h; ++y) {
     40         MD5Update(&md5_, buf, w);
     41         buf += img->stride[plane];
     42       }
     43     }
     44   }
     45 
     46   void Add(const uint8_t *data, size_t size) {
     47     MD5Update(&md5_, data, static_cast<uint32_t>(size));
     48   }
     49 
     50   const char *Get(void) {
     51     static const char hex[16] = {
     52       '0', '1', '2', '3', '4', '5', '6', '7',
     53       '8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
     54     };
     55     uint8_t tmp[16];
     56     MD5Context ctx_tmp = md5_;
     57 
     58     MD5Final(tmp, &ctx_tmp);
     59     for (int i = 0; i < 16; i++) {
     60       res_[i * 2 + 0] = hex[tmp[i] >> 4];
     61       res_[i * 2 + 1] = hex[tmp[i] & 0xf];
     62     }
     63     res_[32] = 0;
     64 
     65     return res_;
     66   }
     67 
     68  protected:
     69   char res_[33];
     70   MD5Context md5_;
     71 };
     72 
     73 }  // namespace libvpx_test
     74 
     75 #endif  // TEST_MD5_HELPER_H_
     76