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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #include "net/quic/quic_data_writer.h" | |
6 | |
7 #include <algorithm> | |
8 #include <limits> | |
9 | |
10 #include "base/basictypes.h" | |
11 #include "base/logging.h" | |
12 #include "net/quic/quic_protocol.h" | |
13 | |
14 using std::numeric_limits; | |
15 | |
16 namespace net { | |
17 | |
18 QuicDataWriter::QuicDataWriter(size_t size) | |
19 : buffer_(new char[size]), | |
20 capacity_(size), | |
21 length_(0) { | |
22 } | |
23 | |
24 QuicDataWriter::~QuicDataWriter() { | |
25 delete[] buffer_; | |
26 } | |
27 | |
28 char* QuicDataWriter::BeginWrite(size_t length) { | |
29 if (length_ + length > capacity_) { | |
jar (doing other things)
2012/10/16 19:24:01
nit: To avoid integer overflow confusion, I think
Ryan Hamilton
2012/10/16 19:43:23
Ah, I see. I didn't realize that was why you wrot
| |
30 return NULL; | |
31 } | |
32 | |
33 #ifdef ARCH_CPU_64_BITS | |
34 DCHECK_LE(length, numeric_limits<uint32>::max()); | |
35 #endif | |
36 | |
37 return buffer_ + length_; | |
38 } | |
39 | |
40 bool QuicDataWriter::AdvancePointer(uint32 len) { | |
41 if (!BeginWrite(len)) { | |
42 return false; | |
43 } | |
44 length_ += len; | |
45 return true; | |
46 } | |
47 | |
48 bool QuicDataWriter::WriteBytes(const void* data, uint32 data_len) { | |
49 char* dest = BeginWrite(data_len); | |
50 if (!dest) { | |
51 return false; | |
52 } | |
53 | |
54 memcpy(dest, data, data_len); | |
55 | |
56 length_ += data_len; | |
57 return true; | |
58 } | |
59 | |
60 void QuicDataWriter::WriteUint64ToBuffer(uint64 value, char* buffer) { | |
61 memcpy(buffer, &value, sizeof(value)); | |
62 } | |
63 | |
64 void QuicDataWriter::WriteUint128ToBuffer(uint128 value, char* buffer) { | |
65 WriteUint64ToBuffer(value.lo, buffer); | |
66 WriteUint64ToBuffer(value.hi, buffer + sizeof(value.lo)); | |
67 } | |
68 | |
69 } // namespace net | |
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