syncthing/vendor/github.com/gogo/protobuf/test/custom/custom.go

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// Protocol Buffers for Go with Gadgets
//
// Copyright (c) 2013, The GoGo Authors. All rights reserved.
// http://github.com/gogo/protobuf
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
/*
Package custom contains custom types for test and example purposes.
These types are used by the test structures generated by gogoprotobuf.
*/
package custom
import (
"bytes"
"encoding/json"
"errors"
)
type Uint128 [2]uint64
func (u Uint128) Marshal() ([]byte, error) {
buffer := make([]byte, 16)
_, err := u.MarshalTo(buffer)
return buffer, err
}
func (u Uint128) MarshalTo(data []byte) (n int, err error) {
PutLittleEndianUint128(data, 0, u)
return 16, nil
}
func GetLittleEndianUint64(b []byte, offset int) uint64 {
v := uint64(b[offset+7]) << 56
v += uint64(b[offset+6]) << 48
v += uint64(b[offset+5]) << 40
v += uint64(b[offset+4]) << 32
v += uint64(b[offset+3]) << 24
v += uint64(b[offset+2]) << 16
v += uint64(b[offset+1]) << 8
v += uint64(b[offset])
return v
}
func PutLittleEndianUint64(b []byte, offset int, v uint64) {
b[offset] = byte(v)
b[offset+1] = byte(v >> 8)
b[offset+2] = byte(v >> 16)
b[offset+3] = byte(v >> 24)
b[offset+4] = byte(v >> 32)
b[offset+5] = byte(v >> 40)
b[offset+6] = byte(v >> 48)
b[offset+7] = byte(v >> 56)
}
func PutLittleEndianUint128(buffer []byte, offset int, v [2]uint64) {
PutLittleEndianUint64(buffer, offset, v[0])
PutLittleEndianUint64(buffer, offset+8, v[1])
}
func GetLittleEndianUint128(buffer []byte, offset int) (value [2]uint64) {
value[0] = GetLittleEndianUint64(buffer, offset)
value[1] = GetLittleEndianUint64(buffer, offset+8)
return
}
func (u *Uint128) Unmarshal(data []byte) error {
if data == nil {
u = nil
return nil
}
if len(data) == 0 {
pu := Uint128{}
*u = pu
return nil
}
if len(data) != 16 {
return errors.New("Uint128: invalid length")
}
pu := Uint128(GetLittleEndianUint128(data, 0))
*u = pu
return nil
}
func (u Uint128) MarshalJSON() ([]byte, error) {
data, err := u.Marshal()
if err != nil {
return nil, err
}
return json.Marshal(data)
}
func (u Uint128) Size() int {
return 16
}
func (u *Uint128) UnmarshalJSON(data []byte) error {
v := new([]byte)
err := json.Unmarshal(data, v)
if err != nil {
return err
}
return u.Unmarshal(*v)
}
func (this Uint128) Equal(that Uint128) bool {
return this == that
}
func (this Uint128) Compare(that Uint128) int {
thisdata, err := this.Marshal()
if err != nil {
panic(err)
}
thatdata, err := that.Marshal()
if err != nil {
panic(err)
}
return bytes.Compare(thisdata, thatdata)
}
type randy interface {
Intn(n int) int
}
func NewPopulatedUint128(r randy) *Uint128 {
data := make([]byte, 16)
for i := 0; i < 16; i++ {
data[i] = byte(r.Intn(255))
}
u := Uint128(GetLittleEndianUint128(data, 0))
return &u
}