custom.go

Documentation: github.com/gogo/protobuf/test/custom

     1  // Protocol Buffers for Go with Gadgets
     2  //
     3  // Copyright (c) 2013, The GoGo Authors. All rights reserved.
     4  // http://github.com/gogo/protobuf
     5  //
     6  // Redistribution and use in source and binary forms, with or without
     7  // modification, are permitted provided that the following conditions are
     8  // met:
     9  //
    10  //     * Redistributions of source code must retain the above copyright
    11  // notice, this list of conditions and the following disclaimer.
    12  //     * Redistributions in binary form must reproduce the above
    13  // copyright notice, this list of conditions and the following disclaimer
    14  // in the documentation and/or other materials provided with the
    15  // distribution.
    16  //
    17  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    18  // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    19  // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    20  // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
    21  // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
    22  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
    23  // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
    24  // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
    25  // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    26  // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    27  // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    28  
    29  /*
    30  	Package custom contains custom types for test and example purposes.
    31  	These types are used by the test structures generated by gogoprotobuf.
    32  */
    33  package custom
    34  
    35  import (
    36  	"bytes"
    37  	"encoding/json"
    38  	"errors"
    39  )
    40  
    41  type Uint128 [2]uint64
    42  
    43  func (u Uint128) Marshal() ([]byte, error) {
    44  	buffer := make([]byte, 16)
    45  	_, err := u.MarshalTo(buffer)
    46  	return buffer, err
    47  }
    48  
    49  func (u Uint128) MarshalTo(data []byte) (n int, err error) {
    50  	PutLittleEndianUint128(data, 0, u)
    51  	return 16, nil
    52  }
    53  
    54  func GetLittleEndianUint64(b []byte, offset int) uint64 {
    55  	v := uint64(b[offset+7]) << 56
    56  	v += uint64(b[offset+6]) << 48
    57  	v += uint64(b[offset+5]) << 40
    58  	v += uint64(b[offset+4]) << 32
    59  	v += uint64(b[offset+3]) << 24
    60  	v += uint64(b[offset+2]) << 16
    61  	v += uint64(b[offset+1]) << 8
    62  	v += uint64(b[offset])
    63  	return v
    64  }
    65  
    66  func PutLittleEndianUint64(b []byte, offset int, v uint64) {
    67  	b[offset] = byte(v)
    68  	b[offset+1] = byte(v >> 8)
    69  	b[offset+2] = byte(v >> 16)
    70  	b[offset+3] = byte(v >> 24)
    71  	b[offset+4] = byte(v >> 32)
    72  	b[offset+5] = byte(v >> 40)
    73  	b[offset+6] = byte(v >> 48)
    74  	b[offset+7] = byte(v >> 56)
    75  }
    76  
    77  func PutLittleEndianUint128(buffer []byte, offset int, v [2]uint64) {
    78  	PutLittleEndianUint64(buffer, offset, v[0])
    79  	PutLittleEndianUint64(buffer, offset+8, v[1])
    80  }
    81  
    82  func GetLittleEndianUint128(buffer []byte, offset int) (value [2]uint64) {
    83  	value[0] = GetLittleEndianUint64(buffer, offset)
    84  	value[1] = GetLittleEndianUint64(buffer, offset+8)
    85  	return
    86  }
    87  
    88  func (u *Uint128) Unmarshal(data []byte) error {
    89  	if data == nil {
    90  		u = nil
    91  		return nil
    92  	}
    93  	if len(data) == 0 {
    94  		pu := Uint128{}
    95  		*u = pu
    96  		return nil
    97  	}
    98  	if len(data) != 16 {
    99  		return errors.New("Uint128: invalid length")
   100  	}
   101  	pu := Uint128(GetLittleEndianUint128(data, 0))
   102  	*u = pu
   103  	return nil
   104  }
   105  
   106  func (u Uint128) MarshalJSON() ([]byte, error) {
   107  	data, err := u.Marshal()
   108  	if err != nil {
   109  		return nil, err
   110  	}
   111  	return json.Marshal(data)
   112  }
   113  
   114  func (u Uint128) Size() int {
   115  	return 16
   116  }
   117  
   118  func (u *Uint128) UnmarshalJSON(data []byte) error {
   119  	v := new([]byte)
   120  	err := json.Unmarshal(data, v)
   121  	if err != nil {
   122  		return err
   123  	}
   124  	return u.Unmarshal(*v)
   125  }
   126  
   127  func (this Uint128) Equal(that Uint128) bool {
   128  	return this == that
   129  }
   130  
   131  func (this Uint128) Compare(that Uint128) int {
   132  	thisdata, err := this.Marshal()
   133  	if err != nil {
   134  		panic(err)
   135  	}
   136  	thatdata, err := that.Marshal()
   137  	if err != nil {
   138  		panic(err)
   139  	}
   140  	return bytes.Compare(thisdata, thatdata)
   141  }
   142  
   143  type randy interface {
   144  	Intn(n int) int
   145  }
   146  
   147  func NewPopulatedUint128(r randy) *Uint128 {
   148  	data := make([]byte, 16)
   149  	for i := 0; i < 16; i++ {
   150  		data[i] = byte(r.Intn(255))
   151  	}
   152  	u := Uint128(GetLittleEndianUint128(data, 0))
   153  	return &u
   154  }
   155
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