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Buffer.go
42 lines (37 loc) · 810 Bytes
/
Buffer.go
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package helpers
import "bytes"
type SeekingBuffer struct {
str string
buffer *bytes.Buffer
offset int64
size int64
}
func NewSeekingBuffer(str string) *SeekingBuffer {
return &SeekingBuffer{
str: str,
buffer: bytes.NewBufferString(str),
offset: 0,
}
}
func (fb *SeekingBuffer) Read(p []byte) (n int, err error) {
n, err = fb.buffer.Read(p)
fb.offset += int64(n)
return n, err
}
func (fb *SeekingBuffer) Seek(offset int64, whence int) (ret int64, err error) {
var newoffset int64
switch whence {
case 0:
newoffset = offset
case 1:
newoffset = fb.offset + offset
case 2:
newoffset = int64(len(fb.str)) - offset
}
if newoffset == fb.offset {
return newoffset, nil
}
fb.buffer = bytes.NewBufferString(fb.str[newoffset:])
fb.offset = newoffset
return fb.offset, nil
}