mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-12-28 09:48:51 +01:00
98263a7de6
* start fixing up tests * fix up tests + automate with drone * fiddle with linting * messing about with drone.yml * some more fiddling * hmmm * add cache * add vendor directory * verbose * ci updates * update some little things * update sig
67 lines
1.6 KiB
Go
67 lines
1.6 KiB
Go
package bufpool
|
|
|
|
import "bytes"
|
|
|
|
// Reset resets the buffer to be empty,
|
|
// but it retains the underlying storage for use by future writes.
|
|
// Reset is the same as Truncate(0).
|
|
func (b *Buffer) Reset() {
|
|
if b.off > cap(b.buf) {
|
|
panic("Buffer is used after Put")
|
|
}
|
|
b.buf = b.buf[:0]
|
|
b.off = 0
|
|
b.lastRead = opInvalid
|
|
}
|
|
|
|
func (b *Buffer) ResetBuf(buf []byte) {
|
|
if b.off > cap(b.buf) {
|
|
panic("Buffer is used after Put")
|
|
}
|
|
b.buf = buf[:0]
|
|
b.off = 0
|
|
b.lastRead = opInvalid
|
|
}
|
|
|
|
// grow grows the buffer to guarantee space for n more bytes.
|
|
// It returns the index where bytes should be written.
|
|
// If the buffer can't grow it will panic with ErrTooLarge.
|
|
func (b *Buffer) grow(n int) int {
|
|
if b.off > cap(b.buf) {
|
|
panic("Buffer is used after Put")
|
|
}
|
|
m := b.Len()
|
|
// If buffer is empty, reset to recover space.
|
|
if m == 0 && b.off != 0 {
|
|
b.Reset()
|
|
}
|
|
// Try to grow by means of a reslice.
|
|
if i, ok := b.tryGrowByReslice(n); ok {
|
|
return i
|
|
}
|
|
if b.buf == nil && n <= smallBufferSize {
|
|
b.buf = make([]byte, n, smallBufferSize)
|
|
return 0
|
|
}
|
|
c := cap(b.buf)
|
|
if n <= c/2-m {
|
|
// We can slide things down instead of allocating a new
|
|
// slice. We only need m+n <= c to slide, but
|
|
// we instead let capacity get twice as large so we
|
|
// don't spend all our time copying.
|
|
copy(b.buf, b.buf[b.off:])
|
|
} else if c > maxInt-c-n {
|
|
panic(bytes.ErrTooLarge)
|
|
} else {
|
|
// Not enough space anywhere, we need to allocate.
|
|
tmp := Get(2*c + n)
|
|
copy(tmp.buf, b.buf[b.off:])
|
|
b.buf, tmp.buf = tmp.buf, b.buf
|
|
Put(tmp)
|
|
}
|
|
// Restore b.off and len(b.buf).
|
|
b.off = 0
|
|
b.buf = b.buf[:m+n]
|
|
return m
|
|
}
|