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// Copyright 2016 Google Inc. All rights reserved.
//
// 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 zip
import (
"io"
)
func (w *Writer) CopyFrom(orig *File, newName string) error {
if w.last != nil && !w.last.closed {
if err := w.last.close(); err != nil {
return err
}
w.last = nil
}
fileHeader := orig.FileHeader
fileHeader.Name = newName
fh := &fileHeader
fh.Flags |= 0x8
h := &header{
FileHeader: fh,
offset: uint64(w.cw.count),
}
w.dir = append(w.dir, h)
if err := writeHeader(w.cw, fh); err != nil {
return err
}
// Copy data
dataOffset, err := orig.DataOffset()
if err != nil {
return err
}
io.Copy(w.cw, io.NewSectionReader(orig.zipr, dataOffset, int64(orig.CompressedSize64)))
// Write data descriptor.
var buf []byte
if fh.isZip64() {
buf = make([]byte, dataDescriptor64Len)
} else {
buf = make([]byte, dataDescriptorLen)
}
b := writeBuf(buf)
b.uint32(dataDescriptorSignature)
b.uint32(fh.CRC32)
if fh.isZip64() {
b.uint64(fh.CompressedSize64)
b.uint64(fh.UncompressedSize64)
} else {
b.uint32(fh.CompressedSize)
b.uint32(fh.UncompressedSize)
}
_, err = w.cw.Write(buf)
return err
}
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