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// Copyright (C) 2014 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package binary_test
import (
"bytes"
"fmt"
"io"
"log"
"android.googlesource.com/platform/tools/gpu/binary"
"android.googlesource.com/platform/tools/gpu/binary/cyclic"
"android.googlesource.com/platform/tools/gpu/binary/registry"
"android.googlesource.com/platform/tools/gpu/binary/vle"
)
type ExampleObject struct{ Data string }
type ExampleClass struct{}
var ExampleID = binary.ID{0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x10, 0x11, 0x12, 0x13, 0x14}
func (*ExampleObject) Class() binary.Class {
return (*ExampleClass)(nil)
}
func (*ExampleClass) ID() binary.ID {
return ExampleID
}
func (*ExampleClass) New() binary.Object {
return &ExampleObject{}
}
func (*ExampleClass) Encode(e binary.Encoder, obj binary.Object) error {
o := obj.(*ExampleObject)
return e.String(o.Data)
}
func (*ExampleClass) Decode(d binary.Decoder) (binary.Object, error) {
o := &ExampleObject{}
var err error
o.Data, err = d.String()
return o, err
}
func (*ExampleClass) DecodeTo(d binary.Decoder, obj binary.Object) error {
o := obj.(*ExampleObject)
var err error
o.Data, err = d.String()
return err
}
func (*ExampleClass) Skip(d binary.Decoder) error {
return d.SkipString()
}
func init() {
registry.Global.Add((*ExampleObject)(nil).Class())
}
// This example shows how to write a type with custom encode and decode
// methods, and send it over a "connection"
func Example_object() {
// Create a connected input and output stream for example purposes.
in := io.Reader(&bytes.Buffer{})
out := in.(io.Writer)
// Build an encoder and decoder on top of the stream
e := cyclic.Encoder(vle.Writer(out))
d := cyclic.Decoder(vle.Reader(in))
// Encode an object onto the stream
if err := e.Object(&ExampleObject{"MyObject"}); err != nil {
log.Fatalf("Encode gave unexpected error: %v", err)
}
// Read the object back
if o, err := d.Object(); err == nil {
fmt.Printf("read %q\n", o.(*ExampleObject).Data)
} else {
log.Fatalf("Decode gave unexpected error: %v", err)
}
// Output:
// read "MyObject"
}
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