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/*
* Copyright (c) SAS Institute, Inc.
*
* 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 cpio
import "io"
// Reader accesses a cpio archive stream using a simple interface similar to the archive/tar package
type Reader struct {
stream *CpioStream
cur *CpioEntry
}
// NewReader starts reading a cpio archive stream
func NewReader(stream io.Reader) *Reader {
return NewReaderWithSizes(stream, nil)
}
// NewReaderWithSizes starts reading a stripped cpio archive from a RPM payload using the provided file sizes
func NewReaderWithSizes(stream io.Reader, sizes []int64) *Reader {
cstream := NewCpioStream(stream)
cstream.SetFileSizes(sizes)
return &Reader{
stream: cstream,
cur: nil,
}
}
// Next returns the metadata of the next file in the archive, which can then be
// read with Read().
//
// Returns io.EOF upon encountering the archive trailer.
func (r *Reader) Next() (*Cpio_newc_header, error) {
ent, err := r.stream.ReadNextEntry()
if err != nil {
return nil, err
} else if ent.Header.filename == TRAILER {
return nil, io.EOF
}
r.cur = ent
return r.cur.Header, nil
}
// Read bytes from the file returned by the preceding call to Next().
//
// Returns io.EOF when the current file has been read in its entirety.
func (r *Reader) Read(p []byte) (n int, err error) {
return r.cur.payload.Read(p)
}
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