media: Add fuzzer test for bit_reader

media/base/bit_reader_core.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/bit_reader_core.h"
 
 #include <stdint.h>
 
 #include "base/sys_byteorder.h"
 
@@ skipping 68 matching lines @@
   reg_next_ = 0;
 
   // Next, skip an integer number of bytes.
   const int nbytes = num_bits / 8;
   if (nbytes > 0) {
     const uint8_t* byte_stream_window;
     const int window_size =
         byte_stream_provider_->GetBytes(nbytes, &byte_stream_window);
     DCHECK_GE(window_size, 0);
     DCHECK_LE(window_size, nbytes);
-    if (window_size < nbytes)
+    if (window_size < nbytes) {
+      // Note that some bytes were consumed.
+      bits_read_ += 8 * window_size;
       return false;
+    }
     num_bits -= 8 * nbytes;
     bits_read_ += 8 * nbytes;
   }
 
   // Skip the remaining bits.
   return SkipBitsSmall(num_bits);
 }
 
 int BitReaderCore::bits_read() const {
   return bits_read_;
@@ skipping 80 matching lines @@
     nbits_next_ = 0;
     return;
   }
 
   nbits_ += free_nbits;
   reg_next_ <<= free_nbits;
   nbits_next_ -= free_nbits;
 }
 
 }  // namespace media