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Side by Side Diff: net/quic/quic_data_writer.h

Issue 992733002: Remove //net (except for Android test stuff) and sdch (Closed) Base URL: git@github.com:domokit/mojo.git@master
Patch Set: Created 5 years, 9 months ago
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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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