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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 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/spdy/hpack/hpack_output_stream.h" | 5 #include "net/spdy/hpack/hpack_output_stream.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 | 8 |
9 namespace net { | 9 namespace net { |
10 | 10 |
11 using base::StringPiece; | 11 using base::StringPiece; |
12 using std::string; | 12 using std::string; |
13 | 13 |
14 HpackOutputStream::HpackOutputStream() : bit_offset_(0) {} | 14 HpackOutputStream::HpackOutputStream() : bit_offset_(0) {} |
15 | 15 |
16 HpackOutputStream::~HpackOutputStream() {} | 16 HpackOutputStream::~HpackOutputStream() {} |
17 | 17 |
18 void HpackOutputStream::AppendBits(uint8 bits, size_t bit_size) { | 18 void HpackOutputStream::AppendBits(uint8_t bits, size_t bit_size) { |
19 DCHECK_GT(bit_size, 0u); | 19 DCHECK_GT(bit_size, 0u); |
20 DCHECK_LE(bit_size, 8u); | 20 DCHECK_LE(bit_size, 8u); |
21 DCHECK_EQ(bits >> bit_size, 0); | 21 DCHECK_EQ(bits >> bit_size, 0); |
22 size_t new_bit_offset = bit_offset_ + bit_size; | 22 size_t new_bit_offset = bit_offset_ + bit_size; |
23 if (bit_offset_ == 0) { | 23 if (bit_offset_ == 0) { |
24 // Buffer ends on a byte boundary. | 24 // Buffer ends on a byte boundary. |
25 DCHECK_LE(bit_size, 8u); | 25 DCHECK_LE(bit_size, 8u); |
26 buffer_.append(1, bits << (8 - bit_size)); | 26 buffer_.append(1, bits << (8 - bit_size)); |
27 } else if (new_bit_offset <= 8) { | 27 } else if (new_bit_offset <= 8) { |
28 // Buffer does not end on a byte boundary but the given bits fit | 28 // Buffer does not end on a byte boundary but the given bits fit |
(...skipping 10 matching lines...) Expand all Loading... |
39 | 39 |
40 void HpackOutputStream::AppendPrefix(HpackPrefix prefix) { | 40 void HpackOutputStream::AppendPrefix(HpackPrefix prefix) { |
41 AppendBits(prefix.bits, prefix.bit_size); | 41 AppendBits(prefix.bits, prefix.bit_size); |
42 } | 42 } |
43 | 43 |
44 void HpackOutputStream::AppendBytes(StringPiece buffer) { | 44 void HpackOutputStream::AppendBytes(StringPiece buffer) { |
45 DCHECK_EQ(bit_offset_, 0u); | 45 DCHECK_EQ(bit_offset_, 0u); |
46 buffer_.append(buffer.data(), buffer.size()); | 46 buffer_.append(buffer.data(), buffer.size()); |
47 } | 47 } |
48 | 48 |
49 void HpackOutputStream::AppendUint32(uint32 I) { | 49 void HpackOutputStream::AppendUint32(uint32_t I) { |
50 // The algorithm below is adapted from the pseudocode in 6.1. | 50 // The algorithm below is adapted from the pseudocode in 6.1. |
51 size_t N = 8 - bit_offset_; | 51 size_t N = 8 - bit_offset_; |
52 uint8 max_first_byte = static_cast<uint8>((1 << N) - 1); | 52 uint8_t max_first_byte = static_cast<uint8_t>((1 << N) - 1); |
53 if (I < max_first_byte) { | 53 if (I < max_first_byte) { |
54 AppendBits(static_cast<uint8>(I), N); | 54 AppendBits(static_cast<uint8_t>(I), N); |
55 } else { | 55 } else { |
56 AppendBits(max_first_byte, N); | 56 AppendBits(max_first_byte, N); |
57 I -= max_first_byte; | 57 I -= max_first_byte; |
58 while ((I & ~0x7f) != 0) { | 58 while ((I & ~0x7f) != 0) { |
59 buffer_.append(1, (I & 0x7f) | 0x80); | 59 buffer_.append(1, (I & 0x7f) | 0x80); |
60 I >>= 7; | 60 I >>= 7; |
61 } | 61 } |
62 AppendBits(static_cast<uint8>(I), 8); | 62 AppendBits(static_cast<uint8_t>(I), 8); |
63 } | 63 } |
64 } | 64 } |
65 | 65 |
66 void HpackOutputStream::TakeString(string* output) { | 66 void HpackOutputStream::TakeString(string* output) { |
67 // This must hold, since all public functions cause the buffer to | 67 // This must hold, since all public functions cause the buffer to |
68 // end on a byte boundary. | 68 // end on a byte boundary. |
69 DCHECK_EQ(bit_offset_, 0u); | 69 DCHECK_EQ(bit_offset_, 0u); |
70 buffer_.swap(*output); | 70 buffer_.swap(*output); |
71 buffer_.clear(); | 71 buffer_.clear(); |
72 bit_offset_ = 0; | 72 bit_offset_ = 0; |
73 } | 73 } |
74 | 74 |
75 } // namespace net | 75 } // namespace net |
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