github.com/vmware/govmomi@v0.37.2/toolbox/hgfs/encoding.go (about)

     1  /*
     2  Copyright (c) 2017 VMware, Inc. All Rights Reserved.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package hgfs
    18  
    19  import (
    20  	"bytes"
    21  	"encoding"
    22  	"encoding/binary"
    23  )
    24  
    25  // MarshalBinary is a wrapper around binary.Write
    26  func MarshalBinary(fields ...interface{}) ([]byte, error) {
    27  	buf := new(bytes.Buffer)
    28  
    29  	for _, p := range fields {
    30  		switch m := p.(type) {
    31  		case encoding.BinaryMarshaler:
    32  			data, err := m.MarshalBinary()
    33  			if err != nil {
    34  				return nil, ProtocolError(err)
    35  			}
    36  
    37  			_, _ = buf.Write(data)
    38  		case []byte:
    39  			_, _ = buf.Write(m)
    40  		case string:
    41  			_, _ = buf.WriteString(m)
    42  		default:
    43  			err := binary.Write(buf, binary.LittleEndian, p)
    44  			if err != nil {
    45  				return nil, ProtocolError(err)
    46  			}
    47  		}
    48  	}
    49  
    50  	return buf.Bytes(), nil
    51  }
    52  
    53  // UnmarshalBinary is a wrapper around binary.Read
    54  func UnmarshalBinary(data []byte, fields ...interface{}) error {
    55  	buf := bytes.NewBuffer(data)
    56  
    57  	for _, p := range fields {
    58  		switch m := p.(type) {
    59  		case encoding.BinaryUnmarshaler:
    60  			return m.UnmarshalBinary(buf.Bytes())
    61  		case *[]byte:
    62  			*m = buf.Bytes()
    63  			return nil
    64  		default:
    65  			err := binary.Read(buf, binary.LittleEndian, p)
    66  			if err != nil {
    67  				return ProtocolError(err)
    68  			}
    69  		}
    70  	}
    71  
    72  	return nil
    73  }