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henrike@webrtc.orgf0488722014-05-13 18:00:26 +00001/*
2 * Copyright 2004 The WebRTC Project Authors. All rights reserved.
3 *
4 * Use of this source code is governed by a BSD-style license
5 * that can be found in the LICENSE file in the root of the source
6 * tree. An additional intellectual property rights grant can be found
7 * in the file PATENTS. All contributing project authors may
8 * be found in the AUTHORS file in the root of the source tree.
9 */
10
11#include "webrtc/base/bytebuffer.h"
12
13#include <assert.h>
14#include <string.h>
15
16#include <algorithm>
17
18#include "webrtc/base/basictypes.h"
19#include "webrtc/base/byteorder.h"
20
21namespace rtc {
22
23static const int DEFAULT_SIZE = 4096;
24
25ByteBuffer::ByteBuffer() {
26 Construct(NULL, DEFAULT_SIZE, ORDER_NETWORK);
27}
28
29ByteBuffer::ByteBuffer(ByteOrder byte_order) {
30 Construct(NULL, DEFAULT_SIZE, byte_order);
31}
32
33ByteBuffer::ByteBuffer(const char* bytes, size_t len) {
34 Construct(bytes, len, ORDER_NETWORK);
35}
36
37ByteBuffer::ByteBuffer(const char* bytes, size_t len, ByteOrder byte_order) {
38 Construct(bytes, len, byte_order);
39}
40
41ByteBuffer::ByteBuffer(const char* bytes) {
42 Construct(bytes, strlen(bytes), ORDER_NETWORK);
43}
44
Karl Wiberg94784372015-04-20 14:03:07 +020045ByteBuffer::ByteBuffer(const Buffer& buf) {
46 Construct(buf.data<char>(), buf.size(), ORDER_NETWORK);
47}
48
henrike@webrtc.orgf0488722014-05-13 18:00:26 +000049void ByteBuffer::Construct(const char* bytes, size_t len,
50 ByteOrder byte_order) {
51 version_ = 0;
52 start_ = 0;
53 size_ = len;
54 byte_order_ = byte_order;
55 bytes_ = new char[size_];
56
57 if (bytes) {
58 end_ = len;
59 memcpy(bytes_, bytes, end_);
60 } else {
61 end_ = 0;
62 }
63}
64
65ByteBuffer::~ByteBuffer() {
66 delete[] bytes_;
67}
68
Peter Boström0c4e06b2015-10-07 12:23:21 +020069bool ByteBuffer::ReadUInt8(uint8_t* val) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +000070 if (!val) return false;
71
72 return ReadBytes(reinterpret_cast<char*>(val), 1);
73}
74
Peter Boström0c4e06b2015-10-07 12:23:21 +020075bool ByteBuffer::ReadUInt16(uint16_t* val) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +000076 if (!val) return false;
77
Peter Boström0c4e06b2015-10-07 12:23:21 +020078 uint16_t v;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +000079 if (!ReadBytes(reinterpret_cast<char*>(&v), 2)) {
80 return false;
81 } else {
82 *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost16(v) : v;
83 return true;
84 }
85}
86
Peter Boström0c4e06b2015-10-07 12:23:21 +020087bool ByteBuffer::ReadUInt24(uint32_t* val) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +000088 if (!val) return false;
89
Peter Boström0c4e06b2015-10-07 12:23:21 +020090 uint32_t v = 0;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +000091 char* read_into = reinterpret_cast<char*>(&v);
92 if (byte_order_ == ORDER_NETWORK || IsHostBigEndian()) {
93 ++read_into;
94 }
95
96 if (!ReadBytes(read_into, 3)) {
97 return false;
98 } else {
99 *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost32(v) : v;
100 return true;
101 }
102}
103
Peter Boström0c4e06b2015-10-07 12:23:21 +0200104bool ByteBuffer::ReadUInt32(uint32_t* val) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000105 if (!val) return false;
106
Peter Boström0c4e06b2015-10-07 12:23:21 +0200107 uint32_t v;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000108 if (!ReadBytes(reinterpret_cast<char*>(&v), 4)) {
109 return false;
110 } else {
111 *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost32(v) : v;
112 return true;
113 }
114}
115
Peter Boström0c4e06b2015-10-07 12:23:21 +0200116bool ByteBuffer::ReadUInt64(uint64_t* val) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000117 if (!val) return false;
118
Peter Boström0c4e06b2015-10-07 12:23:21 +0200119 uint64_t v;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000120 if (!ReadBytes(reinterpret_cast<char*>(&v), 8)) {
121 return false;
122 } else {
123 *val = (byte_order_ == ORDER_NETWORK) ? NetworkToHost64(v) : v;
124 return true;
125 }
126}
127
128bool ByteBuffer::ReadString(std::string* val, size_t len) {
129 if (!val) return false;
130
131 if (len > Length()) {
132 return false;
133 } else {
134 val->append(bytes_ + start_, len);
135 start_ += len;
136 return true;
137 }
138}
139
140bool ByteBuffer::ReadBytes(char* val, size_t len) {
141 if (len > Length()) {
142 return false;
143 } else {
144 memcpy(val, bytes_ + start_, len);
145 start_ += len;
146 return true;
147 }
148}
149
Peter Boström0c4e06b2015-10-07 12:23:21 +0200150void ByteBuffer::WriteUInt8(uint8_t val) {
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000151 WriteBytes(reinterpret_cast<const char*>(&val), 1);
152}
153
Peter Boström0c4e06b2015-10-07 12:23:21 +0200154void ByteBuffer::WriteUInt16(uint16_t val) {
155 uint16_t v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork16(val) : val;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000156 WriteBytes(reinterpret_cast<const char*>(&v), 2);
157}
158
Peter Boström0c4e06b2015-10-07 12:23:21 +0200159void ByteBuffer::WriteUInt24(uint32_t val) {
160 uint32_t v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork32(val) : val;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000161 char* start = reinterpret_cast<char*>(&v);
162 if (byte_order_ == ORDER_NETWORK || IsHostBigEndian()) {
163 ++start;
164 }
165 WriteBytes(start, 3);
166}
167
Peter Boström0c4e06b2015-10-07 12:23:21 +0200168void ByteBuffer::WriteUInt32(uint32_t val) {
169 uint32_t v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork32(val) : val;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000170 WriteBytes(reinterpret_cast<const char*>(&v), 4);
171}
172
Peter Boström0c4e06b2015-10-07 12:23:21 +0200173void ByteBuffer::WriteUInt64(uint64_t val) {
174 uint64_t v = (byte_order_ == ORDER_NETWORK) ? HostToNetwork64(val) : val;
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000175 WriteBytes(reinterpret_cast<const char*>(&v), 8);
176}
177
178void ByteBuffer::WriteString(const std::string& val) {
179 WriteBytes(val.c_str(), val.size());
180}
181
182void ByteBuffer::WriteBytes(const char* val, size_t len) {
183 memcpy(ReserveWriteBuffer(len), val, len);
184}
185
186char* ByteBuffer::ReserveWriteBuffer(size_t len) {
187 if (Length() + len > Capacity())
188 Resize(Length() + len);
189
190 char* start = bytes_ + end_;
191 end_ += len;
192 return start;
193}
194
195void ByteBuffer::Resize(size_t size) {
andresp@webrtc.orgff689be2015-02-12 11:54:26 +0000196 size_t len = std::min(end_ - start_, size);
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000197 if (size <= size_) {
198 // Don't reallocate, just move data backwards
199 memmove(bytes_, bytes_ + start_, len);
200 } else {
201 // Reallocate a larger buffer.
andresp@webrtc.orgff689be2015-02-12 11:54:26 +0000202 size_ = std::max(size, 3 * size_ / 2);
henrike@webrtc.orgf0488722014-05-13 18:00:26 +0000203 char* new_bytes = new char[size_];
204 memcpy(new_bytes, bytes_ + start_, len);
205 delete [] bytes_;
206 bytes_ = new_bytes;
207 }
208 start_ = 0;
209 end_ = len;
210 ++version_;
211}
212
213bool ByteBuffer::Consume(size_t size) {
214 if (size > Length())
215 return false;
216 start_ += size;
217 return true;
218}
219
220ByteBuffer::ReadPosition ByteBuffer::GetReadPosition() const {
221 return ReadPosition(start_, version_);
222}
223
224bool ByteBuffer::SetReadPosition(const ReadPosition &position) {
225 if (position.version_ != version_) {
226 return false;
227 }
228 start_ = position.start_;
229 return true;
230}
231
232void ByteBuffer::Clear() {
233 memset(bytes_, 0, size_);
234 start_ = end_ = 0;
235 ++version_;
236}
237
238} // namespace rtc