mirror of
https://chromium.googlesource.com/libyuv/libyuv
synced 2026-10-28 18:07:12 +08:00
0c781f87b8
Reduces include/libyuv/basic_types.h to only define LIBYUV_API. Directly includes <stdint.h> and <stddef.h> where needed in public headers. Replaces LIBYUV_BOOL, LIBYUV_FALSE, and LIBYUV_TRUE with C++ bool, true, and false in C++ code (MJpegDecoder, unit tests) and int (0, 1) for C API functions. Updates documentation and unit tests. Test: ninja -C out/Release libyuv_unittest && ./out/Release/libyuv_unittest --gtest_filter=* Change-Id: I2d58e872f0f976263bcda546dcc3b1b5f7e53d58 TAG=agy CONV=2730bc56-93ff-48ed-b615-dcde1b834394 Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8280662 Commit-Queue: Wan-Teh Chang <wtc@google.com> Reviewed-by: Wan-Teh Chang <wtc@google.com>
72 lines
2.2 KiB
C++
72 lines
2.2 KiB
C++
/*
|
|
* Copyright 2012 The LibYuv Project Authors. All rights reserved.
|
|
*
|
|
* Use of this source code is governed by a BSD-style license
|
|
* that can be found in the LICENSE file in the root of the source
|
|
* tree. An additional intellectual property rights grant can be found
|
|
* in the file PATENTS. All contributing project authors may
|
|
* be found in the AUTHORS file in the root of the source tree.
|
|
*/
|
|
|
|
#include "libyuv/mjpeg_decoder.h"
|
|
|
|
#include <string.h> // For memchr.
|
|
|
|
#ifdef __cplusplus
|
|
namespace libyuv {
|
|
extern "C" {
|
|
#endif
|
|
|
|
// Helper function to scan for EOI marker (0xff 0xd9).
|
|
static int ScanEOI(const uint8_t* src_mjpg, size_t src_size_mjpg) {
|
|
if (src_size_mjpg >= 2) {
|
|
const uint8_t* end = src_mjpg + src_size_mjpg - 1;
|
|
const uint8_t* it = src_mjpg;
|
|
while (it < end) {
|
|
// TODO(fbarchard): scan for 0xd9 instead.
|
|
it = (const uint8_t*)(memchr(it, 0xff, end - it));
|
|
if (it == NULL) {
|
|
break;
|
|
}
|
|
if (it[1] == 0xd9) {
|
|
return 1; // Success: Valid jpeg.
|
|
}
|
|
++it; // Skip over current 0xff.
|
|
}
|
|
}
|
|
// ERROR: Invalid jpeg end code not found. Size src_size_mjpg
|
|
return 0;
|
|
}
|
|
|
|
// Helper function to validate the jpeg appears intact.
|
|
int ValidateJpeg(const uint8_t* src_mjpg, size_t src_size_mjpg) {
|
|
// Maximum size that ValidateJpeg will consider valid.
|
|
const size_t kMaxJpegSize = 0x7fffffffull;
|
|
const size_t kBackSearchSize = 1024;
|
|
if (src_size_mjpg < 64 || src_size_mjpg > kMaxJpegSize || !src_mjpg) {
|
|
// ERROR: Invalid jpeg size: src_size_mjpg
|
|
return 0;
|
|
}
|
|
// SOI marker
|
|
if (src_mjpg[0] != 0xff || src_mjpg[1] != 0xd8 || src_mjpg[2] != 0xff) {
|
|
// ERROR: Invalid jpeg initial start code
|
|
return 0;
|
|
}
|
|
|
|
// Look for the End Of Image (EOI) marker near the end of the buffer.
|
|
if (src_size_mjpg > kBackSearchSize) {
|
|
if (ScanEOI(src_mjpg + src_size_mjpg - kBackSearchSize, kBackSearchSize)) {
|
|
return 1; // Success: Valid jpeg.
|
|
}
|
|
// Reduce search size for forward search.
|
|
src_size_mjpg = src_size_mjpg - kBackSearchSize + 1;
|
|
}
|
|
// Step over SOI marker and scan for EOI.
|
|
return ScanEOI(src_mjpg + 2, src_size_mjpg - 2);
|
|
}
|
|
|
|
#ifdef __cplusplus
|
|
} // extern "C"
|
|
} // namespace libyuv
|
|
#endif
|