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// Copyright (c) 2011 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.
// Derived from:
// mozilla/netwerk/protocol/http/src/nsHttpChunkedDecoder.h
// The license block is:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
* The Original Code is Mozilla.
* The Initial Developer of the Original Code is
* Netscape Communications.
* Portions created by the Initial Developer are Copyright (C) 2001
* the Initial Developer. All Rights Reserved.
* Contributor(s):
* Darin Fisher <> (original author)
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
* ***** END LICENSE BLOCK ***** */
#include <string>
#include "net/base/net_export.h"
namespace net {
// From RFC2617 section 3.6.1, the chunked transfer coding is defined as:
// Chunked-Body = *chunk
// last-chunk
// trailer
// chunk = chunk-size [ chunk-extension ] CRLF
// chunk-data CRLF
// chunk-size = 1*HEX
// last-chunk = 1*("0") [ chunk-extension ] CRLF
// chunk-extension = *( ";" chunk-ext-name [ "=" chunk-ext-val ] )
// chunk-ext-name = token
// chunk-ext-val = token | quoted-string
// chunk-data = chunk-size(OCTET)
// trailer = *(entity-header CRLF)
// The chunk-size field is a string of hex digits indicating the size of the
// chunk. The chunked encoding is ended by any chunk whose size is zero,
// followed by the trailer, which is terminated by an empty line.
// NOTE: This implementation does not bother to parse trailers since they are
// not used on the web.
class NET_EXPORT_PRIVATE HttpChunkedDecoder {
// The maximum length of |line_buf_| between calls to FilterBuff().
// Exposed for tests.
static const size_t kMaxLineBufLen;
// Indicates that a previous call to FilterBuf encountered the final CRLF.
bool reached_eof() const { return reached_eof_; }
// Returns the number of bytes after the final CRLF.
int bytes_after_eof() const { return bytes_after_eof_; }
// Called to filter out the chunk markers from buf and to check for end-of-
// file. This method modifies |buf| inline if necessary to remove chunk
// markers. The return value indicates the final size of decoded data stored
// in |buf|. Call reached_eof() after this method to check if end-of-file
// was encountered.
int FilterBuf(char* buf, int buf_len);
// Scans |buf| for the next chunk delimiter. This method returns the number
// of bytes consumed from |buf|. If found, |chunk_remaining_| holds the
// value for the next chunk size.
int ScanForChunkRemaining(const char* buf, int buf_len);
// Converts string |start| of length |len| to a numeric value.
// |start| is a string of type "chunk-size" (hex string).
// If the conversion succeeds, returns true and places the result in |out|.
static bool ParseChunkSize(const char* start, int len, int* out);
// Indicates the number of bytes remaining for the current chunk.
int chunk_remaining_;
// A small buffer used to store a partial chunk marker.
std::string line_buf_;
// True if waiting for the terminal CRLF of a chunk's data.
bool chunk_terminator_remaining_;
// Set to true when FilterBuf encounters the last-chunk.
bool reached_last_chunk_;
// Set to true when FilterBuf encounters the final CRLF.
bool reached_eof_;
// The number of extraneous unfiltered bytes after the final CRLF.
int bytes_after_eof_;
} // namespace net