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buffer.go
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buffer.go
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package buffer
import (
"io"
"github.com/corebreaker/ntfstool/core/data/codec"
)
type tBufData struct {
buffer []byte
offset int
}
func (self *tBufData) Read(p []byte) (n int, err error) {
if self.offset >= len(self.buffer) {
if len(p) == 0 {
return
}
return 0, io.EOF
}
n = copy(p, self.buffer[self.offset:])
self.offset += n
return
}
type Buffer struct {
data *tBufData
reader *codec.Decoder
buf [1024]byte
}
func (self *Buffer) Get(size int) []byte {
data := self.data
if (0 >= size) || (size > len(data.buffer)) {
return data.buffer
}
return data.buffer[:size]
}
func (self *Buffer) GetSize() int {
return len(self.data.buffer)
}
func (self *Buffer) SetSize(size int) {
sz := len(self.data.buffer)
if size < sz {
self.data.buffer = self.data.buffer[:size]
} else {
res, bufsz := self.data.buffer, len(self.buf)
for size -= sz; size > 0; size -= bufsz {
sz := bufsz
if sz > size {
sz = size
}
res = append(res, self.buf[:sz]...)
}
self.data.buffer = res
}
}
func (self *Buffer) Reset() {
self.data.offset = 0
}
func (self *Buffer) Decode() (interface{}, error) {
var res interface{}
if _, err := self.reader.Decode(&res); err != nil {
return nil, err
}
return res, nil
}
func MakeBuffer(size int, registry *codec.Registry) *Buffer {
data := &tBufData{
buffer: make([]byte, size),
}
return &Buffer{
data: data,
reader: codec.MakeDecoder(data, registry),
}
}