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standard_codec_serializer.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_STANDARD_CODEC_SERIALIZER_H_
6 #define FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_STANDARD_CODEC_SERIALIZER_H_
7
8 #include "byte_streams.h"
9 #include "encodable_value.h"
10
11 namespace flutter {
12
13 // Encapsulates the logic for encoding/decoding EncodableValues to/from the
14 // standard codec binary representation.
15 //
16 // This can be subclassed to extend the standard codec with support for new
17 // types.
18 class StandardCodecSerializer {
19 public:
20 virtual ~StandardCodecSerializer();
21
22 // Returns the shared serializer instance.
23 static const StandardCodecSerializer& GetInstance();
24
25 // Prevent copying.
26 StandardCodecSerializer(StandardCodecSerializer const&) = delete;
27 StandardCodecSerializer& operator=(StandardCodecSerializer const&) = delete;
28
29 // Reads and returns the next value from |stream|.
30 EncodableValue ReadValue(ByteStreamReader* stream) const;
31
32 // Writes the encoding of |value| to |stream|, including the initial type
33 // discrimination byte.
34 //
35 // Can be overridden by a subclass to extend the codec.
36 virtual void WriteValue(const EncodableValue& value,
37 ByteStreamWriter* stream) const;
38
39 protected:
40 // Codecs require long-lived serializers, so clients should always use
41 // GetInstance().
42 StandardCodecSerializer();
43
44 // Reads and returns the next value from |stream|, whose discrimination byte
45 // was |type|.
46 //
47 // The discrimination byte will already have been read from the stream when
48 // this is called.
49 //
50 // Can be overridden by a subclass to extend the codec.
51 virtual EncodableValue ReadValueOfType(uint8_t type,
52 ByteStreamReader* stream) const;
53
54 // Reads the variable-length size from the current position in |stream|.
55 size_t ReadSize(ByteStreamReader* stream) const;
56
57 // Writes the variable-length size encoding to |stream|.
58 void WriteSize(size_t size, ByteStreamWriter* stream) const;
59
60 private:
61 // Reads a fixed-type list whose values are of type T from the current
62 // position in |stream|, and returns it as the corresponding EncodableValue.
63 // |T| must correspond to one of the supported list value types of
64 // EncodableValue.
65 template <typename T>
66 EncodableValue ReadVector(ByteStreamReader* stream) const;
67
68 // Writes |vector| to |stream| as a fixed-type list. |T| must correspond to
69 // one of the supported list value types of EncodableValue.
70 template <typename T>
71 void WriteVector(const std::vector<T> vector, ByteStreamWriter* stream) const;
72 };
73
74 } // namespace flutter
75
76 #endif // FLUTTER_SHELL_PLATFORM_COMMON_CLIENT_WRAPPER_INCLUDE_FLUTTER_STANDARD_CODEC_SERIALIZER_H_
flutter::StandardCodecSerializer::ReadValue
EncodableValue ReadValue(ByteStreamReader *stream) const
Definition: standard_codec.cc:92
encodable_value.h
type
uint8_t type
Definition: fl_standard_message_codec_test.cc:1115
flutter::StandardCodecSerializer::ReadValueOfType
virtual EncodableValue ReadValueOfType(uint8_t type, ByteStreamReader *stream) const
Definition: standard_codec.cc:168
flutter::StandardCodecSerializer::WriteValue
virtual void WriteValue(const EncodableValue &value, ByteStreamWriter *stream) const
Definition: standard_codec.cc:98
flutter::StandardCodecSerializer::ReadSize
size_t ReadSize(ByteStreamReader *stream) const
Definition: standard_codec.cc:229
flutter::ByteStreamReader
Definition: byte_streams.h:13
flutter::StandardCodecSerializer::GetInstance
static const StandardCodecSerializer & GetInstance()
Definition: standard_codec.cc:87
flutter
Definition: accessibility_bridge.cc:14
flutter::StandardCodecSerializer::StandardCodecSerializer
StandardCodecSerializer()
flutter::StandardCodecSerializer
Definition: standard_codec_serializer.h:18
flutter::EncodableValue
Definition: encodable_value.h:165
byte_streams.h
flutter::StandardCodecSerializer::~StandardCodecSerializer
virtual ~StandardCodecSerializer()
flutter::StandardCodecSerializer::operator=
StandardCodecSerializer & operator=(StandardCodecSerializer const &)=delete
flutter::StandardCodecSerializer::WriteSize
void WriteSize(size_t size, ByteStreamWriter *stream) const
Definition: standard_codec.cc:244
value
uint8_t value
Definition: fl_standard_message_codec.cc:36
flutter::ByteStreamWriter
Definition: byte_streams.h:52