forked from scionproto/scion
/
raw.go
52 lines (44 loc) · 1.16 KB
/
raw.go
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// Copyright 2016 ETH Zurich
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package util
import (
"io"
"github.com/scionproto/scion/go/lib/common"
)
var _ io.ReadWriter = (*Raw)(nil)
type Raw struct {
B common.RawBytes
Offset int
}
func (r *Raw) Peek(p []byte) (int, error) {
if len(r.B[r.Offset:]) <= 0 {
return 0, io.EOF
}
return copy(p, r.B[r.Offset:]), nil
}
func (r *Raw) Read(p []byte) (int, error) {
n, err := r.Peek(p)
if err == nil {
r.Offset += n
}
return n, err
}
func (r *Raw) Write(p []byte) (int, error) {
if len(r.B[r.Offset:]) == 0 {
return 0, io.EOF
}
count := copy(r.B[r.Offset:], p)
r.Offset += count
return count, nil
}