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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 <limits> | |
| 6 | |
| 7 #include "base/sys_byteorder.h" | |
| 8 #include "net/spdy/spdy_frame_reader.h" | |
| 9 #include "net/spdy/spdy_protocol.h" | |
| 10 | |
| 11 namespace net { | |
| 12 | |
| 13 SpdyFrameReader::SpdyFrameReader(const char* data, const size_t len) | |
| 14 : data_(data), | |
| 15 len_(len), | |
| 16 ofs_(0) { | |
| 17 } | |
| 18 | |
| 19 bool SpdyFrameReader::ReadUInt8(uint8_t* result) { | |
| 20 // Make sure that we have the whole uint8_t. | |
| 21 if (!CanRead(1)) { | |
| 22 OnFailure(); | |
| 23 return false; | |
| 24 } | |
| 25 | |
| 26 // Read into result. | |
| 27 *result = *reinterpret_cast<const uint8_t*>(data_ + ofs_); | |
| 28 | |
| 29 // Iterate. | |
| 30 ofs_ += 1; | |
| 31 | |
| 32 return true; | |
| 33 } | |
| 34 | |
| 35 bool SpdyFrameReader::ReadUInt16(uint16_t* result) { | |
| 36 // Make sure that we have the whole uint16_t. | |
| 37 if (!CanRead(2)) { | |
| 38 OnFailure(); | |
| 39 return false; | |
| 40 } | |
| 41 | |
| 42 // Read into result. | |
| 43 *result = | |
| 44 base::NetToHost16(*(reinterpret_cast<const uint16_t*>(data_ + ofs_))); | |
| 45 | |
| 46 // Iterate. | |
| 47 ofs_ += 2; | |
| 48 | |
| 49 return true; | |
| 50 } | |
| 51 | |
| 52 bool SpdyFrameReader::ReadUInt32(uint32_t* result) { | |
| 53 // Make sure that we have the whole uint32_t. | |
| 54 if (!CanRead(4)) { | |
| 55 OnFailure(); | |
| 56 return false; | |
| 57 } | |
| 58 | |
| 59 // Read into result. | |
| 60 *result = | |
| 61 base::NetToHost32(*(reinterpret_cast<const uint32_t*>(data_ + ofs_))); | |
| 62 | |
| 63 // Iterate. | |
| 64 ofs_ += 4; | |
| 65 | |
| 66 return true; | |
| 67 } | |
| 68 | |
| 69 bool SpdyFrameReader::ReadUInt64(uint64_t* result) { | |
| 70 // Make sure that we have the whole uint64_t. | |
| 71 if (!CanRead(8)) { | |
| 72 OnFailure(); | |
| 73 return false; | |
| 74 } | |
| 75 | |
| 76 // Read into result. Network byte order is big-endian. | |
| 77 uint64_t upper = | |
| 78 base::NetToHost32(*(reinterpret_cast<const uint32_t*>(data_ + ofs_))); | |
| 79 uint64_t lower = | |
| 80 base::NetToHost32(*(reinterpret_cast<const uint32_t*>(data_ + ofs_ + 4))); | |
| 81 *result = (upper << 32) + lower; | |
| 82 | |
| 83 // Iterate. | |
| 84 ofs_ += 8; | |
| 85 | |
| 86 return true; | |
| 87 } | |
| 88 | |
| 89 bool SpdyFrameReader::ReadUInt31(uint32_t* result) { | |
| 90 bool success = ReadUInt32(result); | |
| 91 | |
| 92 // Zero out highest-order bit. | |
| 93 if (success) { | |
| 94 *result &= 0x7fffffff; | |
| 95 } | |
| 96 | |
| 97 return success; | |
| 98 } | |
| 99 | |
| 100 bool SpdyFrameReader::ReadUInt24(uint32_t* result) { | |
| 101 // Make sure that we have the whole uint24. | |
| 102 if (!CanRead(3)) { | |
| 103 OnFailure(); | |
| 104 return false; | |
| 105 } | |
| 106 | |
| 107 // Read into result. | |
| 108 *result = 0; | |
| 109 memcpy(reinterpret_cast<char*>(result) + 1, data_ + ofs_, 3); | |
| 110 *result = base::NetToHost32(*result); | |
| 111 | |
| 112 // Iterate. | |
| 113 ofs_ += 3; | |
| 114 | |
| 115 return true; | |
| 116 } | |
| 117 | |
| 118 bool SpdyFrameReader::ReadStringPiece16(SpdyStringPiece* result) { | |
| 119 // Read resultant length. | |
| 120 uint16_t result_len; | |
| 121 if (!ReadUInt16(&result_len)) { | |
| 122 // OnFailure() already called. | |
| 123 return false; | |
| 124 } | |
| 125 | |
| 126 // Make sure that we have the whole string. | |
| 127 if (!CanRead(result_len)) { | |
| 128 OnFailure(); | |
| 129 return false; | |
| 130 } | |
| 131 | |
| 132 // Set result. | |
| 133 *result = SpdyStringPiece(data_ + ofs_, result_len); | |
| 134 | |
| 135 // Iterate. | |
| 136 ofs_ += result_len; | |
| 137 | |
| 138 return true; | |
| 139 } | |
| 140 | |
| 141 bool SpdyFrameReader::ReadStringPiece32(SpdyStringPiece* result) { | |
| 142 // Read resultant length. | |
| 143 uint32_t result_len; | |
| 144 if (!ReadUInt32(&result_len)) { | |
| 145 // OnFailure() already called. | |
| 146 return false; | |
| 147 } | |
| 148 | |
| 149 // Make sure that we have the whole string. | |
| 150 if (!CanRead(result_len)) { | |
| 151 OnFailure(); | |
| 152 return false; | |
| 153 } | |
| 154 | |
| 155 // Set result. | |
| 156 *result = SpdyStringPiece(data_ + ofs_, result_len); | |
| 157 | |
| 158 // Iterate. | |
| 159 ofs_ += result_len; | |
| 160 | |
| 161 return true; | |
| 162 } | |
| 163 | |
| 164 bool SpdyFrameReader::ReadBytes(void* result, size_t size) { | |
| 165 // Make sure that we have enough data to read. | |
| 166 if (!CanRead(size)) { | |
| 167 OnFailure(); | |
| 168 return false; | |
| 169 } | |
| 170 | |
| 171 // Read into result. | |
| 172 memcpy(result, data_ + ofs_, size); | |
| 173 | |
| 174 // Iterate. | |
| 175 ofs_ += size; | |
| 176 | |
| 177 return true; | |
| 178 } | |
| 179 | |
| 180 bool SpdyFrameReader::Seek(size_t size) { | |
| 181 if (!CanRead(size)) { | |
| 182 OnFailure(); | |
| 183 return false; | |
| 184 } | |
| 185 | |
| 186 // Iterate. | |
| 187 ofs_ += size; | |
| 188 | |
| 189 return true; | |
| 190 } | |
| 191 | |
| 192 bool SpdyFrameReader::IsDoneReading() const { | |
| 193 return len_ == ofs_; | |
| 194 } | |
| 195 | |
| 196 bool SpdyFrameReader::CanRead(size_t bytes) const { | |
| 197 return bytes <= (len_ - ofs_); | |
| 198 } | |
| 199 | |
| 200 void SpdyFrameReader::OnFailure() { | |
| 201 // Set our iterator to the end of the buffer so that further reads fail | |
| 202 // immediately. | |
| 203 ofs_ = len_; | |
| 204 } | |
| 205 | |
| 206 } // namespace net | |
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Chromium Code Reviews
Issue 2832973003:
Split net/spdy into core and chromium subdirectories. (Closed)
