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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 #ifndef NET_QUIC_QUIC_DATA_WRITER_H_ | |
| 6 #define NET_QUIC_QUIC_DATA_WRITER_H_ | |
| 7 | |
| 8 #include <string> | |
| 9 | |
| 10 #include "base/basictypes.h" | |
| 11 #include "base/logging.h" | |
| 12 #include "base/port.h" | |
| 13 #include "base/strings/string_piece.h" | |
| 14 #include "net/base/int128.h" | |
| 15 #include "net/base/net_export.h" | |
| 16 #include "net/quic/quic_protocol.h" | |
| 17 | |
| 18 namespace net { | |
| 19 | |
| 20 // This class provides facilities for packing QUIC data. | |
| 21 // | |
| 22 // The QuicDataWriter supports appending primitive values (int, string, etc) | |
| 23 // to a frame instance. The internal memory buffer is exposed as the "data" | |
| 24 // of the QuicDataWriter. | |
| 25 class NET_EXPORT_PRIVATE QuicDataWriter { | |
| 26 public: | |
| 27 // Creates a QuicDataWriter where |buffer| is not owned. | |
| 28 QuicDataWriter(size_t size, char* buffer); | |
| 29 | |
| 30 ~QuicDataWriter(); | |
| 31 | |
| 32 // Returns the size of the QuicDataWriter's data. | |
| 33 size_t length() const { return length_; } | |
| 34 | |
| 35 // Retrieves the buffer from the QuicDataWriter without changing ownership. | |
| 36 char* data(); | |
| 37 | |
| 38 // Methods for adding to the payload. These values are appended to the end | |
| 39 // of the QuicDataWriter payload. Note - binary integers are written in | |
| 40 // host byte order (little endian) not network byte order (big endian). | |
| 41 bool WriteUInt8(uint8 value); | |
| 42 bool WriteUInt16(uint16 value); | |
| 43 bool WriteUInt32(uint32 value); | |
| 44 bool WriteUInt48(uint64 value); | |
| 45 bool WriteUInt64(uint64 value); | |
| 46 // Write unsigned floating point corresponding to the value. Large values are | |
| 47 // clamped to the maximum representable (kUFloat16MaxValue). Values that can | |
| 48 // not be represented directly are rounded down. | |
| 49 bool WriteUFloat16(uint64 value); | |
| 50 bool WriteStringPiece16(base::StringPiece val); | |
| 51 bool WriteIOVector(const IOVector& data); | |
| 52 bool WriteBytes(const void* data, size_t data_len); | |
| 53 bool WriteRepeatedByte(uint8 byte, size_t count); | |
| 54 // Fills the remaining buffer with null characters. | |
| 55 void WritePadding(); | |
| 56 | |
| 57 // Methods for editing the payload at a specific offset, where the | |
| 58 // offset must be within the writer's capacity. | |
| 59 // Return true if there is enough space at that offset, false otherwise. | |
| 60 bool WriteUInt8ToOffset(uint8 value, size_t offset); | |
| 61 bool WriteUInt32ToOffset(uint32 value, size_t offset); | |
| 62 bool WriteUInt48ToOffset(uint64 value, size_t offset); | |
| 63 | |
| 64 size_t capacity() const { | |
| 65 return capacity_; | |
| 66 } | |
| 67 | |
| 68 private: | |
| 69 // Returns the location that the data should be written at, or nullptr if | |
| 70 // there is not enough room. Call EndWrite with the returned offset and the | |
| 71 // given length to pad out for the next write. | |
| 72 char* BeginWrite(size_t length); | |
| 73 | |
| 74 char* buffer_; | |
| 75 size_t capacity_; // Allocation size of payload (or -1 if buffer is const). | |
| 76 size_t length_; // Current length of the buffer. | |
| 77 | |
| 78 DISALLOW_COPY_AND_ASSIGN(QuicDataWriter); | |
| 79 }; | |
| 80 | |
| 81 } // namespace net | |
| 82 | |
| 83 #endif // NET_QUIC_QUIC_DATA_WRITER_H_ | |
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