Method Malloc

util/buffer.go:195–206

Malloc 扩大原来的buffer的长度，返回新增的buffer

(count int)

// Malloc 扩大原来的buffer的长度，返回新增的buffer
func (b *Buffer) Malloc(count int) Buffer {
	l := b.Len()
	newL := l + count
	if newL > b.Cap() {
		n := make(Buffer, newL)
		copy(n, *b)
		*b = n
	} else {
		*b = b.SubBuf(0, newL)
	}
	return b.SubBuf(l, count)
}

// Relloc 改变 buffer 到指定大小
func (b *Buffer) Relloc(count int) {