libvpx: Pull from upstream

source/libvpx/vp9/vp9_dx_iface.c

 /*
  *  Copyright (c) 2010 The WebM 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.
  */
 
@@ skipping 94 matching lines @@
   return VPX_CODEC_OK;
 }
 
 static vpx_codec_err_t decoder_peek_si_internal(const uint8_t *data,
                                                 unsigned int data_sz,
                                                 vpx_codec_stream_info_t *si,
                                                 vpx_decrypt_cb decrypt_cb,
                                                 void *decrypt_state) {
   uint8_t clear_buffer[9];
 
-  if (data_sz <= 8)
-    return VPX_CODEC_UNSUP_BITSTREAM;
-
   if (data + data_sz <= data)
     return VPX_CODEC_INVALID_PARAM;
 
   si->is_kf = 0;
   si->w = si->h = 0;
 
   if (decrypt_cb) {
     data_sz = MIN(sizeof(clear_buffer), data_sz);
     decrypt_cb(decrypt_state, data, clear_buffer, data_sz);
     data = clear_buffer;
   }
 
   {
     struct vp9_read_bit_buffer rb = { data, data + data_sz, 0, NULL, NULL };
     const int frame_marker = vp9_rb_read_literal(&rb, 2);
     const int version = vp9_rb_read_bit(&rb);
     (void) vp9_rb_read_bit(&rb);  // unused version bit
 
     if (frame_marker != VP9_FRAME_MARKER)
       return VPX_CODEC_UNSUP_BITSTREAM;
+
     if (version > 1) return VPX_CODEC_UNSUP_BITSTREAM;
 
     if (vp9_rb_read_bit(&rb)) {  // show an existing frame
       return VPX_CODEC_OK;
     }
 
+    if (data_sz <= 8)
+      return VPX_CODEC_UNSUP_BITSTREAM;
+
     si->is_kf = !vp9_rb_read_bit(&rb);
     if (si->is_kf) {
       const int sRGB = 7;
       int colorspace;
 
       rb.bit_offset += 1;  // show frame
       rb.bit_offset += 1;  // error resilient
 
       if (vp9_rb_read_literal(&rb, 8) != VP9_SYNC_CODE_0 ||
           vp9_rb_read_literal(&rb, 8) != VP9_SYNC_CODE_1 ||
@@ skipping 648 matching lines @@
   { // NOLINT
     NOT_IMPLEMENTED,  // vpx_codec_enc_cfg_map_t
     NOT_IMPLEMENTED,  // vpx_codec_encode_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_get_cx_data_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_enc_config_set_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_get_global_headers_fn_t
     NOT_IMPLEMENTED,  // vpx_codec_get_preview_frame_fn_t
     NOT_IMPLEMENTED   // vpx_codec_enc_mr_get_mem_loc_fn_t
   }
 };