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byte_streams.h
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1 // Copyright 2013 The Flutter 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 FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_BYTE_STREAMS_H_
6 #define FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_BYTE_STREAMS_H_
7
8 // Interfaces for interacting with a stream of bytes, for use in codecs.
9
10 namespace flutter {
11
12 // An interface for a class that reads from a byte stream.
13 class ByteStreamReader {
14 public:
15 explicit ByteStreamReader() = default;
16 virtual ~ByteStreamReader() = default;
17
18 // Reads and returns the next byte from the stream.
19 virtual uint8_t ReadByte() = 0;
20
21 // Reads the next |length| bytes from the stream into |buffer|. The caller
22 // is responsible for ensuring that |buffer| is large enough.
23 virtual void ReadBytes(uint8_t* buffer, size_t length) = 0;
24
25 // Advances the read cursor to the next multiple of |alignment| relative to
26 // the start of the stream, unless it is already aligned.
27 virtual void ReadAlignment(uint8_t alignment) = 0;
28
29 // Reads and returns the next 32-bit integer from the stream.
30 int32_t ReadInt32() {
31 int32_t value = 0;
32 ReadBytes(reinterpret_cast<uint8_t*>(&value), 4);
33 return value;
34 }
35
36 // Reads and returns the next 64-bit integer from the stream.
37 int64_t ReadInt64() {
38 int64_t value = 0;
39 ReadBytes(reinterpret_cast<uint8_t*>(&value), 8);
40 return value;
41 }
42
43 // Reads and returns the next 64-bit floating point number from the stream.
44 double ReadDouble() {
45 double value = 0;
46 ReadBytes(reinterpret_cast<uint8_t*>(&value), 8);
47 return value;
48 }
49 };
50
51 // An interface for a class that writes to a byte stream.
52 class ByteStreamWriter {
53 public:
54 explicit ByteStreamWriter() = default;
55 virtual ~ByteStreamWriter() = default;
56
57 // Writes |byte| to the stream.
58 virtual void WriteByte(uint8_t byte) = 0;
59
60 // Writes the next |length| bytes from |bytes| to the stream
61 virtual void WriteBytes(const uint8_t* bytes, size_t length) = 0;
62
63 // Writes 0s until the next multiple of |alignment| relative to the start
64 // of the stream, unless the write positition is already aligned.
65 virtual void WriteAlignment(uint8_t alignment) = 0;
66
67 // Writes the given 32-bit int to the stream.
68 void WriteInt32(int32_t value) {
69 WriteBytes(reinterpret_cast<const uint8_t*>(&value), 4);
70 }
71
72 // Writes the given 64-bit int to the stream.
73 void WriteInt64(int64_t value) {
74 WriteBytes(reinterpret_cast<const uint8_t*>(&value), 8);
75 }
76
77 // Writes the given 36-bit double to the stream.
78 void WriteDouble(double value) {
79 WriteBytes(reinterpret_cast<const uint8_t*>(&value), 8);
80 }
81 };
82
83 } // namespace flutter
84
85 #endif // FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_BYTE_STREAMS_H_
flutter::ByteStreamReader::ReadByte
virtual uint8_t ReadByte()=0
flutter::ByteStreamReader::ReadDouble
double ReadDouble()
Definition: byte_streams.h:44
flutter::ByteStreamReader::ReadBytes
virtual void ReadBytes(uint8_t *buffer, size_t length)=0
flutter::ByteStreamReader::~ByteStreamReader
virtual ~ByteStreamReader()=default
flutter::ByteStreamWriter::ByteStreamWriter
ByteStreamWriter()=default
flutter::ByteStreamWriter::WriteInt32
void WriteInt32(int32_t value)
Definition: byte_streams.h:68
flutter::ByteStreamReader::ReadInt64
int64_t ReadInt64()
Definition: byte_streams.h:37
flutter::ByteStreamReader
Definition: byte_streams.h:13
flutter::ByteStreamWriter::~ByteStreamWriter
virtual ~ByteStreamWriter()=default
flutter
Definition: accessibility_bridge.cc:14
flutter::ByteStreamWriter::WriteDouble
void WriteDouble(double value)
Definition: byte_streams.h:78
flutter::ByteStreamWriter::WriteBytes
virtual void WriteBytes(const uint8_t *bytes, size_t length)=0
flutter::ByteStreamWriter::WriteAlignment
virtual void WriteAlignment(uint8_t alignment)=0
buffer
static const uint8_t buffer[]
Definition: fl_pixel_buffer_texture_test.cc:44
flutter::ByteStreamReader::ReadInt32
int32_t ReadInt32()
Definition: byte_streams.h:30
flutter::ByteStreamWriter::WriteByte
virtual void WriteByte(uint8_t byte)=0
value
uint8_t value
Definition: fl_standard_message_codec.cc:36
length
size_t length
Definition: fl_standard_message_codec_test.cc:1113
flutter::ByteStreamWriter
Definition: byte_streams.h:52
flutter::ByteStreamReader::ByteStreamReader
ByteStreamReader()=default
flutter::ByteStreamReader::ReadAlignment
virtual void ReadAlignment(uint8_t alignment)=0
flutter::ByteStreamWriter::WriteInt64
void WriteInt64(int64_t value)
Definition: byte_streams.h:73