github.com/hoveychen/kafka-go@v0.4.42/protocol/size.go (about)

     1  package protocol
     2  
     3  import (
     4  	"math/bits"
     5  )
     6  
     7  func sizeOfVarString(s string) int {
     8  	return sizeOfVarInt(int64(len(s))) + len(s)
     9  }
    10  
    11  func sizeOfVarNullBytes(b []byte) int {
    12  	if b == nil {
    13  		return sizeOfVarInt(-1)
    14  	}
    15  	n := len(b)
    16  	return sizeOfVarInt(int64(n)) + n
    17  }
    18  
    19  func sizeOfVarNullBytesIface(b Bytes) int {
    20  	if b == nil {
    21  		return sizeOfVarInt(-1)
    22  	}
    23  	n := b.Len()
    24  	return sizeOfVarInt(int64(n)) + n
    25  }
    26  
    27  func sizeOfVarInt(i int64) int {
    28  	return sizeOfUnsignedVarInt(uint64((i << 1) ^ (i >> 63))) // zig-zag encoding
    29  }
    30  
    31  func sizeOfUnsignedVarInt(i uint64) int {
    32  	return (bits.Len64(i|1) + 6) / 7
    33  }