The Tor Browser: media/libyuv/source/mjpeg

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /*

     2  *  Copyright 2012 The LibYuv 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  */

    11 #include "libyuv/mjpeg_decoder.h"

    13 #ifdef __cplusplus

    14 namespace libyuv {

    15 extern "C" {

    16 #endif

    18 // Helper function to validate the jpeg appears intact.

    19 // TODO(fbarchard): Optimize case where SOI is found but EOI is not.

    20 LIBYUV_BOOL ValidateJpeg(const uint8* sample, size_t sample_size) {

    21   size_t i;

    22   if (sample_size < 64) {

    23     // ERROR: Invalid jpeg size: sample_size

    24     return LIBYUV_FALSE;

    25   }

    26   if (sample[0] != 0xff || sample[1] != 0xd8) {  // Start Of Image

    27     // ERROR: Invalid jpeg initial start code

    28     return LIBYUV_FALSE;

    29   }

    30   for (i = sample_size - 2; i > 1;) {

    31     if (sample[i] != 0xd9) {

    32       if (sample[i] == 0xff && sample[i + 1] == 0xd9) {  // End Of Image

    33         return LIBYUV_TRUE;  // Success: Valid jpeg.

    34       }

    35       --i;

    36     }

    37     --i;

    38   }

    39   // ERROR: Invalid jpeg end code not found. Size sample_size

    40   return LIBYUV_FALSE;

    41 }

    43 #ifdef __cplusplus

    44 }  // extern "C"

    45 }  // namespace libyuv

    46 #endif

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