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package util
import (
"bytes"
"io"
)
// ReaderSize defines a reader of known size in bytes.
type ReaderSize interface {
io.Reader
Size() int64
}
// ByteReaderSize implements ReaderSize for an in-memory byte-slice.
type ByteReaderSize struct {
br bytes.Reader
sz int64
}
// NewByteReaderSize returns a new ByteReaderSize instance reset to slice b.
func NewByteReaderSize(b []byte) *ByteReaderSize {
rs := new(ByteReaderSize)
rs.Reset(b)
return rs
}
// Read implements io.Reader.
func (rs *ByteReaderSize) Read(b []byte) (int, error) {
return rs.br.Read(b)
}
// Size implements ReaderSize.
func (rs *ByteReaderSize) Size() int64 {
return rs.sz
}
// Reset resets the ReaderSize to be reading from b.
func (rs *ByteReaderSize) Reset(b []byte) {
rs.br.Reset(b)
rs.sz = int64(len(b))
}
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