Implement better HPACK Huffman code decoder.

net/spdy/fuzzing/hpack_fuzz_util.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 "net/spdy/fuzzing/hpack_fuzz_util.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/rand_util.h"
@@ skipping 123 matching lines @@
 }
 
 // static
 string HpackFuzzUtil::HeaderBlockPrefix(size_t block_size) {
   uint32_t length = base::HostToNet32(static_cast<uint32_t>(block_size));
   return string(reinterpret_cast<char*>(&length), sizeof(uint32_t));
 }
 
 // static
 void HpackFuzzUtil::InitializeFuzzerContext(FuzzerContext* context) {
-  context->first_stage.reset(new HpackDecoder(ObtainHpackHuffmanTable()));
+  context->first_stage.reset(new HpackDecoder());
   context->second_stage.reset(new HpackEncoder(ObtainHpackHuffmanTable()));
-  context->third_stage.reset(new HpackDecoder(ObtainHpackHuffmanTable()));
+  context->third_stage.reset(new HpackDecoder());
 }
 
 // static
 bool HpackFuzzUtil::RunHeaderBlockThroughFuzzerStages(FuzzerContext* context,
                                                       StringPiece input_block) {
   // First stage: Decode the input header block. This may fail on invalid input.
   if (!context->first_stage->HandleControlFrameHeadersData(
           input_block.data(), input_block.size())) {
     return false;
   }
@@ skipping 26 matching lines @@
   uint64_t bits_to_flip = flip_per_thousand * (1 + buffer_bit_length / 1024);
 
   // Iteratively identify & flip offsets in the buffer bit-sequence.
   for (uint64_t i = 0; i != bits_to_flip; ++i) {
     uint64_t bit_offset = base::RandUint64() % buffer_bit_length;
     buffer[bit_offset / 8u] ^= (1 << (bit_offset % 8u));
   }
 }
 
 }  // namespace net