byteio - littleendianreader_varint.go

     1  package byteio
     2  
     3  // ReadUintX reads an unsinged integer that was encoded using a variable number
     4  // of bytes
     5  func (e *LittleEndianReader) ReadUintX() (uint64, int, error) {
     6  	var (
     7  		n   int
     8  		val uint64
     9  	)
    10  	for n < 9 {
    11  		c, err := e.ReadByte()
    12  		if err != nil {
    13  			return 0, n, err
    14  		}
    15  		val += uint64(c) << uint(n*7)
    16  		n++
    17  		if c&0x80 == 0 {
    18  			break
    19  		}
    20  	}
    21  	return val, n, nil
    22  }
    23  
    24  // ReadIntX reads an integer that was encoded using a variable number of bytes
    25  func (e *LittleEndianReader) ReadIntX() (int64, int, error) {
    26  	i, n, err := e.ReadUintX()
    27  	return unzigzag(i), n, err
    28  }
    29