forked from mirrors/gotosocial
138 lines
2.4 KiB
Go
138 lines
2.4 KiB
Go
package bytes
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import (
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"unicode/utf8"
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)
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// Buffer is a very simple buffer implementation that allows
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// access to and reslicing of the underlying byte slice.
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type Buffer struct {
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noCopy noCopy
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B []byte
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}
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func NewBuffer(b []byte) Buffer {
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return Buffer{
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noCopy: noCopy{},
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B: b,
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}
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}
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func (b *Buffer) Write(p []byte) (int, error) {
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b.Grow(len(p))
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return copy(b.B[b.Len()-len(p):], p), nil
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}
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func (b *Buffer) WriteString(s string) (int, error) {
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b.Grow(len(s))
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return copy(b.B[b.Len()-len(s):], s), nil
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}
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func (b *Buffer) WriteByte(c byte) error {
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l := b.Len()
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b.Grow(1)
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b.B[l] = c
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return nil
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}
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func (b *Buffer) WriteRune(r rune) (int, error) {
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if r < utf8.RuneSelf {
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b.WriteByte(byte(r))
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return 1, nil
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}
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l := b.Len()
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b.Grow(utf8.UTFMax)
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n := utf8.EncodeRune(b.B[l:b.Len()], r)
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b.B = b.B[:l+n]
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return n, nil
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}
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func (b *Buffer) WriteAt(p []byte, start int64) (int, error) {
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b.Grow(len(p) - int(int64(b.Len())-start))
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return copy(b.B[start:], p), nil
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}
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func (b *Buffer) WriteStringAt(s string, start int64) (int, error) {
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b.Grow(len(s) - int(int64(b.Len())-start))
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return copy(b.B[start:], s), nil
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}
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func (b *Buffer) Truncate(size int) {
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b.B = b.B[:b.Len()-size]
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}
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func (b *Buffer) ShiftByte(index int) {
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copy(b.B[index:], b.B[index+1:])
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}
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func (b *Buffer) Shift(start int64, size int) {
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copy(b.B[start:], b.B[start+int64(size):])
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}
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func (b *Buffer) DeleteByte(index int) {
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b.ShiftByte(index)
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b.Truncate(1)
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}
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func (b *Buffer) Delete(start int64, size int) {
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b.Shift(start, size)
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b.Truncate(size)
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}
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func (b *Buffer) InsertByte(index int64, c byte) {
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l := b.Len()
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b.Grow(1)
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copy(b.B[index+1:], b.B[index:l])
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b.B[index] = c
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}
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func (b *Buffer) Insert(index int64, p []byte) {
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l := b.Len()
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b.Grow(len(p))
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copy(b.B[index+int64(len(p)):], b.B[index:l])
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copy(b.B[index:], p)
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}
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func (b *Buffer) Bytes() []byte {
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return b.B
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}
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func (b *Buffer) String() string {
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return string(b.B)
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}
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func (b *Buffer) StringPtr() string {
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return BytesToString(b.B)
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}
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func (b *Buffer) Cap() int {
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return cap(b.B)
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}
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func (b *Buffer) Len() int {
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return len(b.B)
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}
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func (b *Buffer) Reset() {
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b.B = b.B[:0]
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}
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func (b *Buffer) Grow(size int) {
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b.Guarantee(size)
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b.B = b.B[:b.Len()+size]
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}
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func (b *Buffer) Guarantee(size int) {
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if size > b.Cap()-b.Len() {
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nb := make([]byte, 2*b.Cap()+size)
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copy(nb, b.B)
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b.B = nb[:b.Len()]
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}
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}
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type noCopy struct{}
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func (n *noCopy) Lock() {}
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func (n *noCopy) Unlock() {}
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