102 lines
2.7 KiB
Go
102 lines
2.7 KiB
Go
// Package buffer provides a thin wrapper around a byte slice. Unlike the
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// standard library's bytes.BytesBuffer, it supports a portion of the strconv
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// package's zero-allocation formatters.
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package buffer
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import (
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"strconv"
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"time"
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)
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// BytesBuffer is a thin wrapper around a byte slice. It's intended to be
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// pooled, so the only way to construct one is via a BytesBufferPool.
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type BytesBuffer struct {
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bs []byte
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pool BytesBufferPool
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}
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// Free returns the BytesBuffer to its BytesBufferPool.
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// Callers must not retain references to the BytesBuffer after calling Free.
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func (b *BytesBuffer) Free() {
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b.pool.put(b)
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}
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// Len returns the length of the underlying byte slice.
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func (b *BytesBuffer) Len() int {
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return len(b.bs)
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}
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// Cap returns the capacity of the underlying byte slice.
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func (b *BytesBuffer) Cap() int {
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return cap(b.bs)
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}
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// Bytes returns a mutable reference to the underlying byte slice.
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func (b *BytesBuffer) Bytes() []byte {
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return b.bs
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}
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// String returns a string copy of the underlying byte slice.
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func (b *BytesBuffer) String() string {
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return string(b.bs)
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}
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// Reset resets the underlying byte slice. Subsequent writes re-use the slice's
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// backing array.
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func (b *BytesBuffer) Reset() {
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b.bs = b.bs[:0]
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}
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// Write implements io.Writer.
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func (b *BytesBuffer) Write(bs []byte) (int, error) {
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b.bs = append(b.bs, bs...)
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return len(bs), nil
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}
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// AppendByte writes a single byte to the BytesBuffer.
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func (b *BytesBuffer) AppendByte(v byte) {
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b.bs = append(b.bs, v)
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}
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// AppendBytes writes bytes to the BytesBuffer.
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func (b *BytesBuffer) AppendBytes(bs []byte) {
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b.bs = append(b.bs, bs...)
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}
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// AppendString writes a string to the BytesBuffer.
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func (b *BytesBuffer) AppendString(s string) {
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b.bs = append(b.bs, s...)
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}
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// AppendInt appends an integer to the underlying buffer (assuming base 10).
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func (b *BytesBuffer) AppendInt(i int64) {
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b.bs = strconv.AppendInt(b.bs, i, 10)
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}
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// AppendUint appends an unsigned integer to the underlying buffer (assuming
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// base 10).
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func (b *BytesBuffer) AppendUint(i uint64) {
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b.bs = strconv.AppendUint(b.bs, i, 10)
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}
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// AppendFloat appends a float to the underlying buffer. It doesn't quote NaN
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// or +/- Inf.
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func (b *BytesBuffer) AppendFloat(f float64, bitSize int) {
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b.bs = strconv.AppendFloat(b.bs, f, 'f', -1, bitSize)
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}
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// AppendBool appends a bool to the underlying buffer.
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func (b *BytesBuffer) AppendBool(v bool) {
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b.bs = strconv.AppendBool(b.bs, v)
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}
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// AppendTime appends a time to the underlying buffer.
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func (b *BytesBuffer) AppendTime(t time.Time, format string) {
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if format == "" {
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b.bs = strconv.AppendInt(b.bs, t.Unix(), 10)
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} else {
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b.bs = t.AppendFormat(b.bs, format)
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}
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}
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const defaultSize = 1024 // Create 1 KiB buffers by default
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