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package mlog
import (
"io"
"sync"
)
var bufPool = newSliceBufferPool()
type sliceBufferPool struct {
*sync.Pool
}
func newSliceBufferPool() *sliceBufferPool {
return &sliceBufferPool{
&sync.Pool{New: func() interface{} {
return &sliceBuffer{make([]byte, 0, 1024)}
}},
}
}
func (sp *sliceBufferPool) Get() *sliceBuffer {
return (sp.Pool.Get()).(*sliceBuffer)
}
func (sp *sliceBufferPool) Put(c *sliceBuffer) {
c.Truncate(0)
sp.Pool.Put(c)
}
type byteSliceWriter interface {
Write([]byte) (int, error)
WriteByte(byte) error
WriteString(string) (int, error)
Truncate(int)
}
type intSliceWriter interface {
byteSliceWriter
AppendIntWidth(int, int)
AppendIntWidthHex(int64, int)
}
type sliceBuffer struct {
data []byte
}
func (sb *sliceBuffer) AppendIntWidth(i int, wid int) {
digits := 0
// write digits backwards (easier/faster)
for i >= 10 {
q := i / 10
sb.data = append(sb.data, byte('0'+i-q*10))
i = q
digits++
}
sb.data = append(sb.data, byte('0'+i))
digits++
for j := wid - digits; j > 0; j-- {
sb.data = append(sb.data, '0')
digits++
}
// reverse to proper order
sblen := len(sb.data)
for i, j := sblen-digits, sblen-1; i < j; i, j = i+1, j-1 {
sb.data[i], sb.data[j] = sb.data[j], sb.data[i]
}
}
const hexdigits = "0123456789abcdefghijklmnopqrstuvwxyz"
func (sb *sliceBuffer) AppendIntWidthHex(i int64, wid int) {
u := uint64(i)
digits := 0
b := uint64(16)
m := uintptr(b) - 1
for u >= b {
sb.data = append(sb.data, hexdigits[uintptr(u)&m])
u >>= 4
digits++
}
sb.data = append(sb.data, hexdigits[uintptr(u)])
digits++
for j := wid - digits; j > 0; j-- {
sb.data = append(sb.data, '0')
digits++
}
// reverse to proper order
sblen := len(sb.data)
for i, j := sblen-digits, sblen-1; i < j; i, j = i+1, j-1 {
sb.data[i], sb.data[j] = sb.data[j], sb.data[i]
}
}
func (sb *sliceBuffer) Write(b []byte) (int, error) {
sb.data = append(sb.data, b...)
return len(b), nil
}
func (sb *sliceBuffer) WriteByte(c byte) error {
sb.data = append(sb.data, c)
return nil
}
func (sb *sliceBuffer) WriteString(s string) (int, error) {
sb.data = append(sb.data, s...)
return len(s), nil
}
func (sb *sliceBuffer) WriteTo(w io.Writer) (int64, error) {
n, err := w.Write(sb.data)
return int64(n), err
}
func (sb *sliceBuffer) Bytes() []byte {
return sb.data
}
func (sb *sliceBuffer) String() string {
return string(sb.data)
}
func (sb *sliceBuffer) Len() int {
return len(sb.data)
}
func (sb *sliceBuffer) Reset() {
sb.Truncate(0)
}
func (sb *sliceBuffer) Truncate(i int) {
sb.data = sb.data[:i]
}
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