1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libyuv/source/mjpeg_validate.cc Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,47 @@
1.4 +/*
1.5 + * Copyright 2012 The LibYuv Project Authors. All rights reserved.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license
1.8 + * that can be found in the LICENSE file in the root of the source
1.9 + * tree. An additional intellectual property rights grant can be found
1.10 + * in the file PATENTS. All contributing project authors may
1.11 + * be found in the AUTHORS file in the root of the source tree.
1.12 + */
1.13 +
1.14 +#include "libyuv/mjpeg_decoder.h"
1.15 +
1.16 +#ifdef __cplusplus
1.17 +namespace libyuv {
1.18 +extern "C" {
1.19 +#endif
1.20 +
1.21 +// Helper function to validate the jpeg appears intact.
1.22 +// TODO(fbarchard): Optimize case where SOI is found but EOI is not.
1.23 +LIBYUV_BOOL ValidateJpeg(const uint8* sample, size_t sample_size) {
1.24 + size_t i;
1.25 + if (sample_size < 64) {
1.26 + // ERROR: Invalid jpeg size: sample_size
1.27 + return LIBYUV_FALSE;
1.28 + }
1.29 + if (sample[0] != 0xff || sample[1] != 0xd8) { // Start Of Image
1.30 + // ERROR: Invalid jpeg initial start code
1.31 + return LIBYUV_FALSE;
1.32 + }
1.33 + for (i = sample_size - 2; i > 1;) {
1.34 + if (sample[i] != 0xd9) {
1.35 + if (sample[i] == 0xff && sample[i + 1] == 0xd9) { // End Of Image
1.36 + return LIBYUV_TRUE; // Success: Valid jpeg.
1.37 + }
1.38 + --i;
1.39 + }
1.40 + --i;
1.41 + }
1.42 + // ERROR: Invalid jpeg end code not found. Size sample_size
1.43 + return LIBYUV_FALSE;
1.44 +}
1.45 +
1.46 +#ifdef __cplusplus
1.47 +} // extern "C"
1.48 +} // namespace libyuv
1.49 +#endif
1.50 +
