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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "net/websockets/websocket_deflater.h" | 5 #include "net/websockets/websocket_deflater.h" |
6 | 6 |
7 #include <string.h> | 7 #include <string.h> |
8 #include <algorithm> | 8 #include <algorithm> |
9 #include <deque> | 9 #include <deque> |
10 #include <vector> | 10 #include <vector> |
11 | 11 |
12 #include "base/logging.h" | 12 #include "base/logging.h" |
13 #include "net/base/io_buffer.h" | 13 #include "net/base/io_buffer.h" |
14 #include "third_party/zlib/zlib.h" | 14 #include "third_party/zlib/zlib.h" |
15 | 15 |
16 namespace net { | 16 namespace net { |
17 | 17 |
18 WebSocketDeflater::WebSocketDeflater(ContextTakeOverMode mode) | 18 WebSocketDeflater::WebSocketDeflater(ContextTakeOverMode mode) |
19 : mode_(mode), are_bytes_added_(false) {} | 19 : mode_(mode), are_bytes_added_(false) { |
| 20 } |
20 | 21 |
21 WebSocketDeflater::~WebSocketDeflater() { | 22 WebSocketDeflater::~WebSocketDeflater() { |
22 if (stream_) { | 23 if (stream_) { |
23 deflateEnd(stream_.get()); | 24 deflateEnd(stream_.get()); |
24 stream_.reset(NULL); | 25 stream_.reset(NULL); |
25 } | 26 } |
26 } | 27 } |
27 | 28 |
28 bool WebSocketDeflater::Initialize(int window_bits) { | 29 bool WebSocketDeflater::Initialize(int window_bits) { |
29 DCHECK(!stream_); | 30 DCHECK(!stream_); |
30 stream_.reset(new z_stream); | 31 stream_.reset(new z_stream); |
31 | 32 |
32 DCHECK_LE(8, window_bits); | 33 DCHECK_LE(8, window_bits); |
33 DCHECK_GE(15, window_bits); | 34 DCHECK_GE(15, window_bits); |
34 memset(stream_.get(), 0, sizeof(*stream_)); | 35 memset(stream_.get(), 0, sizeof(*stream_)); |
35 int result = deflateInit2(stream_.get(), | 36 int result = deflateInit2(stream_.get(), |
36 Z_DEFAULT_COMPRESSION, | 37 Z_DEFAULT_COMPRESSION, |
37 Z_DEFLATED, | 38 Z_DEFLATED, |
38 -window_bits, // Negative value for raw deflate | 39 -window_bits, // Negative value for raw deflate |
39 8, // default mem level | 40 8, // default mem level |
40 Z_DEFAULT_STRATEGY); | 41 Z_DEFAULT_STRATEGY); |
41 if (result != Z_OK) { | 42 if (result != Z_OK) { |
42 deflateEnd(stream_.get()); | 43 deflateEnd(stream_.get()); |
43 stream_.reset(); | 44 stream_.reset(); |
44 return false; | 45 return false; |
45 } | 46 } |
46 const size_t kFixedBufferSize = 4096; | 47 const size_t kFixedBufferSize = 4096; |
47 fixed_buffer_.resize(kFixedBufferSize); | 48 fixed_buffer_.resize(kFixedBufferSize); |
48 return true; | 49 return true; |
49 } | 50 } |
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118 stream_->next_out = reinterpret_cast<Bytef*>(&fixed_buffer_[0]); | 119 stream_->next_out = reinterpret_cast<Bytef*>(&fixed_buffer_[0]); |
119 stream_->avail_out = fixed_buffer_.size(); | 120 stream_->avail_out = fixed_buffer_.size(); |
120 result = deflate(stream_.get(), flush); | 121 result = deflate(stream_.get(), flush); |
121 size_t size = fixed_buffer_.size() - stream_->avail_out; | 122 size_t size = fixed_buffer_.size() - stream_->avail_out; |
122 buffer_.insert(buffer_.end(), &fixed_buffer_[0], &fixed_buffer_[0] + size); | 123 buffer_.insert(buffer_.end(), &fixed_buffer_[0], &fixed_buffer_[0] + size); |
123 } while (result == Z_OK); | 124 } while (result == Z_OK); |
124 return result; | 125 return result; |
125 } | 126 } |
126 | 127 |
127 } // namespace net | 128 } // namespace net |
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