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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 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 | 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/spdy_frame_builder.h" | 5 #include "net/spdy/spdy_frame_builder.h" |
| 6 | 6 |
| 7 #include <limits> | 7 #include <limits> |
| 8 | 8 |
| 9 #include "base/logging.h" | 9 #include "base/logging.h" |
| 10 #include "net/spdy/spdy_framer.h" | 10 #include "net/spdy/spdy_framer.h" |
| 11 #include "net/spdy/spdy_protocol.h" | 11 #include "net/spdy/spdy_protocol.h" |
| 12 | 12 |
| 13 namespace net { | 13 namespace net { |
| 14 | 14 |
| 15 namespace { | 15 namespace { |
| 16 | 16 |
| 17 // A special structure for the 8 bit flags and 24 bit length fields. | 17 // A special structure for the 8 bit flags and 24 bit length fields. |
| 18 union FlagsAndLength { | 18 union FlagsAndLength { |
| 19 uint8 flags[4]; // 8 bits | 19 uint8_t flags[4]; // 8 bits |
| 20 uint32 length; // 24 bits | 20 uint32_t length; // 24 bits |
| 21 }; | 21 }; |
| 22 | 22 |
| 23 // Creates a FlagsAndLength. | 23 // Creates a FlagsAndLength. |
| 24 FlagsAndLength CreateFlagsAndLength(uint8 flags, size_t length) { | 24 FlagsAndLength CreateFlagsAndLength(uint8_t flags, size_t length) { |
| 25 DCHECK_EQ(0u, length & ~static_cast<size_t>(kLengthMask)); | 25 DCHECK_EQ(0u, length & ~static_cast<size_t>(kLengthMask)); |
| 26 FlagsAndLength flags_length; | 26 FlagsAndLength flags_length; |
| 27 flags_length.length = base::HostToNet32(static_cast<uint32>(length)); | 27 flags_length.length = base::HostToNet32(static_cast<uint32_t>(length)); |
| 28 DCHECK_EQ(0, flags & ~kControlFlagsMask); | 28 DCHECK_EQ(0, flags & ~kControlFlagsMask); |
| 29 flags_length.flags[0] = flags; | 29 flags_length.flags[0] = flags; |
| 30 return flags_length; | 30 return flags_length; |
| 31 } | 31 } |
| 32 | 32 |
| 33 } // namespace | 33 } // namespace |
| 34 | 34 |
| 35 SpdyFrameBuilder::SpdyFrameBuilder(size_t size, SpdyMajorVersion version) | 35 SpdyFrameBuilder::SpdyFrameBuilder(size_t size, SpdyMajorVersion version) |
| 36 : buffer_(new char[size]), | 36 : buffer_(new char[size]), |
| 37 capacity_(size), | 37 capacity_(size), |
| (...skipping 16 matching lines...) Expand all Loading... |
| 54 if (!CanWrite(length)) { | 54 if (!CanWrite(length)) { |
| 55 return false; | 55 return false; |
| 56 } | 56 } |
| 57 | 57 |
| 58 length_ += length; | 58 length_ += length; |
| 59 return true; | 59 return true; |
| 60 } | 60 } |
| 61 | 61 |
| 62 bool SpdyFrameBuilder::WriteControlFrameHeader(const SpdyFramer& framer, | 62 bool SpdyFrameBuilder::WriteControlFrameHeader(const SpdyFramer& framer, |
| 63 SpdyFrameType type, | 63 SpdyFrameType type, |
| 64 uint8 flags) { | 64 uint8_t flags) { |
| 65 DCHECK_GE(SPDY3, version_); | 65 DCHECK_GE(SPDY3, version_); |
| 66 DCHECK(SpdyConstants::IsValidFrameType( | 66 DCHECK(SpdyConstants::IsValidFrameType( |
| 67 version_, SpdyConstants::SerializeFrameType(version_, type))); | 67 version_, SpdyConstants::SerializeFrameType(version_, type))); |
| 68 bool success = true; | 68 bool success = true; |
| 69 FlagsAndLength flags_length = CreateFlagsAndLength( | 69 FlagsAndLength flags_length = CreateFlagsAndLength( |
| 70 flags, capacity_ - framer.GetControlFrameHeaderSize()); | 70 flags, capacity_ - framer.GetControlFrameHeaderSize()); |
| 71 success &= WriteUInt16(kControlFlagMask | | 71 success &= WriteUInt16(kControlFlagMask | |
| 72 SpdyConstants::SerializeMajorVersion(version_)); | 72 SpdyConstants::SerializeMajorVersion(version_)); |
| 73 success &= WriteUInt16( | 73 success &= WriteUInt16( |
| 74 SpdyConstants::SerializeFrameType(framer.protocol_version(), type)); | 74 SpdyConstants::SerializeFrameType(framer.protocol_version(), type)); |
| 75 success &= WriteBytes(&flags_length, sizeof(flags_length)); | 75 success &= WriteBytes(&flags_length, sizeof(flags_length)); |
| 76 DCHECK_EQ(framer.GetControlFrameHeaderSize(), length()); | 76 DCHECK_EQ(framer.GetControlFrameHeaderSize(), length()); |
| 77 return success; | 77 return success; |
| 78 } | 78 } |
| 79 | 79 |
| 80 bool SpdyFrameBuilder::WriteDataFrameHeader(const SpdyFramer& framer, | 80 bool SpdyFrameBuilder::WriteDataFrameHeader(const SpdyFramer& framer, |
| 81 SpdyStreamId stream_id, | 81 SpdyStreamId stream_id, |
| 82 uint8 flags) { | 82 uint8_t flags) { |
| 83 if (version_ > SPDY3) { | 83 if (version_ > SPDY3) { |
| 84 return BeginNewFrame(framer, DATA, flags, stream_id); | 84 return BeginNewFrame(framer, DATA, flags, stream_id); |
| 85 } | 85 } |
| 86 DCHECK_EQ(0u, stream_id & ~kStreamIdMask); | 86 DCHECK_EQ(0u, stream_id & ~kStreamIdMask); |
| 87 bool success = true; | 87 bool success = true; |
| 88 success &= WriteUInt32(stream_id); | 88 success &= WriteUInt32(stream_id); |
| 89 size_t length_field = capacity_ - framer.GetDataFrameMinimumSize(); | 89 size_t length_field = capacity_ - framer.GetDataFrameMinimumSize(); |
| 90 DCHECK_EQ(0u, length_field & ~static_cast<size_t>(kLengthMask)); | 90 DCHECK_EQ(0u, length_field & ~static_cast<size_t>(kLengthMask)); |
| 91 FlagsAndLength flags_length; | 91 FlagsAndLength flags_length; |
| 92 flags_length.length = base::HostToNet32(static_cast<uint32>(length_field)); | 92 flags_length.length = base::HostToNet32(static_cast<uint32_t>(length_field)); |
| 93 DCHECK_EQ(0, flags & ~kDataFlagsMask); | 93 DCHECK_EQ(0, flags & ~kDataFlagsMask); |
| 94 flags_length.flags[0] = flags; | 94 flags_length.flags[0] = flags; |
| 95 success &= WriteBytes(&flags_length, sizeof(flags_length)); | 95 success &= WriteBytes(&flags_length, sizeof(flags_length)); |
| 96 DCHECK_EQ(framer.GetDataFrameMinimumSize(), length()); | 96 DCHECK_EQ(framer.GetDataFrameMinimumSize(), length()); |
| 97 return success; | 97 return success; |
| 98 } | 98 } |
| 99 | 99 |
| 100 bool SpdyFrameBuilder::BeginNewFrame(const SpdyFramer& framer, | 100 bool SpdyFrameBuilder::BeginNewFrame(const SpdyFramer& framer, |
| 101 SpdyFrameType type, | 101 SpdyFrameType type, |
| 102 uint8 flags, | 102 uint8_t flags, |
| 103 SpdyStreamId stream_id) { | 103 SpdyStreamId stream_id) { |
| 104 DCHECK(SpdyConstants::IsValidFrameType( | 104 DCHECK(SpdyConstants::IsValidFrameType( |
| 105 version_, SpdyConstants::SerializeFrameType(version_, type))); | 105 version_, SpdyConstants::SerializeFrameType(version_, type))); |
| 106 DCHECK_EQ(0u, stream_id & ~kStreamIdMask); | 106 DCHECK_EQ(0u, stream_id & ~kStreamIdMask); |
| 107 DCHECK_GT(framer.protocol_version(), SPDY3); | 107 DCHECK_GT(framer.protocol_version(), SPDY3); |
| 108 bool success = true; | 108 bool success = true; |
| 109 if (length_ > 0) { | 109 if (length_ > 0) { |
| 110 // Update length field for previous frame. | 110 // Update length field for previous frame. |
| 111 OverwriteLength(framer, length_ - framer.GetPrefixLength(type)); | 111 OverwriteLength(framer, length_ - framer.GetPrefixLength(type)); |
| 112 DLOG_IF(DFATAL, SpdyConstants::GetFrameMaximumSize(version_) < length_) | 112 DLOG_IF(DFATAL, SpdyConstants::GetFrameMaximumSize(version_) < length_) |
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| 129 DCHECK_EQ(framer.GetDataFrameMinimumSize(), length_); | 129 DCHECK_EQ(framer.GetDataFrameMinimumSize(), length_); |
| 130 return success; | 130 return success; |
| 131 } | 131 } |
| 132 | 132 |
| 133 bool SpdyFrameBuilder::WriteStringPiece16(const base::StringPiece& value) { | 133 bool SpdyFrameBuilder::WriteStringPiece16(const base::StringPiece& value) { |
| 134 if (value.size() > 0xffff) { | 134 if (value.size() > 0xffff) { |
| 135 DCHECK(false) << "Tried to write string with length > 16bit."; | 135 DCHECK(false) << "Tried to write string with length > 16bit."; |
| 136 return false; | 136 return false; |
| 137 } | 137 } |
| 138 | 138 |
| 139 if (!WriteUInt16(static_cast<uint16>(value.size()))) { | 139 if (!WriteUInt16(static_cast<uint16_t>(value.size()))) { |
| 140 return false; | 140 return false; |
| 141 } | 141 } |
| 142 | 142 |
| 143 return WriteBytes(value.data(), static_cast<uint16>(value.size())); | 143 return WriteBytes(value.data(), static_cast<uint16_t>(value.size())); |
| 144 } | 144 } |
| 145 | 145 |
| 146 bool SpdyFrameBuilder::WriteStringPiece32(const base::StringPiece& value) { | 146 bool SpdyFrameBuilder::WriteStringPiece32(const base::StringPiece& value) { |
| 147 if (!WriteUInt32(value.size())) { | 147 if (!WriteUInt32(value.size())) { |
| 148 return false; | 148 return false; |
| 149 } | 149 } |
| 150 | 150 |
| 151 return WriteBytes(value.data(), value.size()); | 151 return WriteBytes(value.data(), value.size()); |
| 152 } | 152 } |
| 153 | 153 |
| 154 bool SpdyFrameBuilder::WriteBytes(const void* data, uint32 data_len) { | 154 bool SpdyFrameBuilder::WriteBytes(const void* data, uint32_t data_len) { |
| 155 if (!CanWrite(data_len)) { | 155 if (!CanWrite(data_len)) { |
| 156 return false; | 156 return false; |
| 157 } | 157 } |
| 158 | 158 |
| 159 char* dest = GetWritableBuffer(data_len); | 159 char* dest = GetWritableBuffer(data_len); |
| 160 memcpy(dest, data, data_len); | 160 memcpy(dest, data, data_len); |
| 161 Seek(data_len); | 161 Seek(data_len); |
| 162 return true; | 162 return true; |
| 163 } | 163 } |
| 164 | 164 |
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| 190 sizeof(flags_length) - 1); | 190 sizeof(flags_length) - 1); |
| 191 } else { | 191 } else { |
| 192 length_ = 0; | 192 length_ = 0; |
| 193 success = WriteUInt24(length); | 193 success = WriteUInt24(length); |
| 194 } | 194 } |
| 195 | 195 |
| 196 length_ = old_length; | 196 length_ = old_length; |
| 197 return success; | 197 return success; |
| 198 } | 198 } |
| 199 | 199 |
| 200 bool SpdyFrameBuilder::OverwriteFlags(const SpdyFramer& framer, | 200 bool SpdyFrameBuilder::OverwriteFlags(const SpdyFramer& framer, uint8_t flags) { |
| 201 uint8 flags) { | |
| 202 DCHECK_GT(framer.protocol_version(), SPDY3); | 201 DCHECK_GT(framer.protocol_version(), SPDY3); |
| 203 bool success = false; | 202 bool success = false; |
| 204 const size_t old_length = length_; | 203 const size_t old_length = length_; |
| 205 // Flags are the fifth octet in the frame prefix. | 204 // Flags are the fifth octet in the frame prefix. |
| 206 length_ = 4; | 205 length_ = 4; |
| 207 success = WriteUInt8(flags); | 206 success = WriteUInt8(flags); |
| 208 length_ = old_length; | 207 length_ = old_length; |
| 209 return success; | 208 return success; |
| 210 } | 209 } |
| 211 | 210 |
| 212 bool SpdyFrameBuilder::CanWrite(size_t length) const { | 211 bool SpdyFrameBuilder::CanWrite(size_t length) const { |
| 213 if (length > kLengthMask) { | 212 if (length > kLengthMask) { |
| 214 DCHECK(false); | 213 DCHECK(false); |
| 215 return false; | 214 return false; |
| 216 } | 215 } |
| 217 | 216 |
| 218 if (offset_ + length_ + length > capacity_) { | 217 if (offset_ + length_ + length > capacity_) { |
| 219 DCHECK(false); | 218 DCHECK(false); |
| 220 return false; | 219 return false; |
| 221 } | 220 } |
| 222 | 221 |
| 223 return true; | 222 return true; |
| 224 } | 223 } |
| 225 | 224 |
| 226 } // namespace net | 225 } // namespace net |
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