Remove bzip2 decoding support completely.

net/base/bzip2_filter.h

-// Copyright (c) 2006-2008 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.
-//
-// BZip2Filter applies bzip2 content encoding/decoding to a datastream.
-// Since it is a new feature, and no specification said what 's bzip2 content
-// composed of  in http protocol.  So I assume with bzip2 encoding the content
-// is full format, which means the content should carry complete bzip2 head,
-// such as inlcude magic number 1(BZh), block size bit, magic number 2(0x31,
-// 0x41, 0x59, 0x26, 0xx53, 0x59)
-// Maybe need to inserts a bzlib2 header to the data stream before calling
-// decompression functionality, but at now I do not meet this sort of real
-// scenarios. So let's see the further requests.
-//
-// This BZip2Filter internally uses third_party/bzip2 library to do decoding.
-//
-// BZip2Filter is also a subclass of Filter. See the latter's header file
-// filter.h for sample usage.
-
-#ifndef NET_BASE_BZIP2_FILTER_H_
-#define NET_BASE_BZIP2_FILTER_H_
-
-#if defined(USE_SYSTEM_LIBBZ2)
-#include <bzlib.h>
-#else
-#include "third_party/bzip2/bzlib.h"
-#endif
-
-#include "base/scoped_ptr.h"
-#include "net/base/filter.h"
-
-class BZip2Filter : public Filter {
- public:
-  explicit BZip2Filter(const FilterContext& filter_context);
-
-  virtual ~BZip2Filter();
-
-  // Initializes filter decoding mode and internal control blocks.
-  // Parameter use_small_memory specifies whether use small memory
-  // to decompresss data. If small is nonzero, the bzip2 library will
-  // use an alternative decompression algorithm which uses less memory
-  // but at the cost of decompressing more slowly (roughly speaking,
-  // half the speed, but the maximum memory requirement drops to
-  // around 2300k). For more information, see doc in http://www.bzip.org.
-  // The function returns true if success and false otherwise.
-  // The filter can only be initialized once.
-  bool InitDecoding(bool use_small_memory);
-
-  // Decodes the pre-filter data and writes the output into the dest_buffer
-  // passed in.
-  // The function returns FilterStatus. See filter.h for its description.
-  //
-  // Since BZ2_bzDecompress need a full BZip header for decompression, so
-  // the incoming data should have the full BZip header, otherwise this
-  // function will give you nothing with FILTER_ERROR.
-  //
-  // Upon entry, *dest_len is the total size (in number of chars) of the
-  // destination buffer. Upon exit, *dest_len is the actual number of chars
-  // written into the destination buffer.
-  //
-  // This function will fail if there is no pre-filter data in the
-  // stream_buffer_. On the other hand, *dest_len can be 0 upon successful
-  // return. For example, the internal zlib may process some pre-filter data
-  // but not produce output yet.
-  virtual FilterStatus ReadFilteredData(char* dest_buffer, int* dest_len);
-
- private:
-  enum DecodingStatus {
-    DECODING_UNINITIALIZED,
-    DECODING_IN_PROGRESS,
-    DECODING_DONE,
-    DECODING_ERROR
-  };
-
-  // Tracks the status of decoding.
-  // This variable is initialized by InitDecoding and updated only by
-  // ReadFilteredData.
-  DecodingStatus decoding_status_;
-
-  // The control block of bzip which actually does the decoding.
-  // This data structure is initialized by InitDecoding and updated in
-  // ReadFilteredData.
-  scoped_ptr<bz_stream> bzip2_data_stream_;
-
-  DISALLOW_COPY_AND_ASSIGN(BZip2Filter);
-};
-
-#endif  // NET_BASE_BZIP2_FILTER_H_