ddd1d92ff1
The idea here is to preserve the history of `dev` branch development and its code when merging with the `master`. Later this code could be moved into the masters code where appropriate.
71 lines
1.5 KiB
Go
71 lines
1.5 KiB
Go
package util
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"io"
|
|
)
|
|
|
|
//BinReader is a convenient wrapper around a io.Reader and err object
|
|
// Used to simplify error handling when reading into a struct with many fields
|
|
type BinReader struct {
|
|
R io.Reader
|
|
Err error
|
|
}
|
|
|
|
// Read reads from the underlying io.Reader
|
|
// into the interface v in LE
|
|
func (r *BinReader) Read(v interface{}) {
|
|
if r.Err != nil {
|
|
return
|
|
}
|
|
r.Err = binary.Read(r.R, binary.LittleEndian, v)
|
|
}
|
|
|
|
// ReadBigEnd reads from the underlying io.Reader
|
|
// into the interface v in BE
|
|
func (r *BinReader) ReadBigEnd(v interface{}) {
|
|
if r.Err != nil {
|
|
return
|
|
}
|
|
r.Err = binary.Read(r.R, binary.BigEndian, v)
|
|
}
|
|
|
|
//VarUint reads a variable integer from the
|
|
// underlying reader
|
|
func (r *BinReader) VarUint() uint64 {
|
|
var b uint8
|
|
r.Err = binary.Read(r.R, binary.LittleEndian, &b)
|
|
|
|
if b == 0xfd {
|
|
var v uint16
|
|
r.Err = binary.Read(r.R, binary.LittleEndian, &v)
|
|
return uint64(v)
|
|
}
|
|
if b == 0xfe {
|
|
var v uint32
|
|
r.Err = binary.Read(r.R, binary.LittleEndian, &v)
|
|
return uint64(v)
|
|
}
|
|
if b == 0xff {
|
|
var v uint64
|
|
r.Err = binary.Read(r.R, binary.LittleEndian, &v)
|
|
return v
|
|
}
|
|
|
|
return uint64(b)
|
|
}
|
|
|
|
// VarBytes reads the next set of bytes from the underlying reader.
|
|
// VarUInt is used to determine how large that slice is
|
|
func (r *BinReader) VarBytes() []byte {
|
|
n := r.VarUint()
|
|
b := make([]byte, n)
|
|
r.Read(b)
|
|
return b
|
|
}
|
|
|
|
// VarString calls VarBytes and casts the results as a string
|
|
func (r *BinReader) VarString() string {
|
|
b := r.VarBytes()
|
|
return string(b)
|
|
}
|