3bf1a08505
This doesn't do any decompression / recompression, but just copies over the already compressed contents. So it's similar to zip -U, but allows rewriting of the paths. The first expected usecase is to replace img_from_target_files during the build, since it does the equivalent of this: zip2zip -i <target-files.zip> -o <img.zip> OTA/android-info.txt:android-info.txt IMAGES/*:. Except it decompresses and recompresses the images, which takes over a minute instead of a few seconds. Change-Id: I88d0df188635088783223873f78e193272dbdf1c
71 lines
1.6 KiB
Go
71 lines
1.6 KiB
Go
// Copyright 2016 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package zip
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import (
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"io"
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)
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func (w *Writer) CopyFrom(orig *File, newName string) error {
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if w.last != nil && !w.last.closed {
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if err := w.last.close(); err != nil {
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return err
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}
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w.last = nil
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}
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fileHeader := orig.FileHeader
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fileHeader.Name = newName
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fh := &fileHeader
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fh.Flags |= 0x8
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h := &header{
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FileHeader: fh,
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offset: uint64(w.cw.count),
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}
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w.dir = append(w.dir, h)
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if err := writeHeader(w.cw, fh); err != nil {
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return err
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}
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// Copy data
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dataOffset, err := orig.DataOffset()
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if err != nil {
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return err
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}
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io.Copy(w.cw, io.NewSectionReader(orig.zipr, dataOffset, int64(orig.CompressedSize64)))
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// Write data descriptor.
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var buf []byte
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if fh.isZip64() {
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buf = make([]byte, dataDescriptor64Len)
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} else {
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buf = make([]byte, dataDescriptorLen)
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}
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b := writeBuf(buf)
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b.uint32(dataDescriptorSignature)
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b.uint32(fh.CRC32)
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if fh.isZip64() {
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b.uint64(fh.CompressedSize64)
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b.uint64(fh.UncompressedSize64)
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} else {
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b.uint32(fh.CompressedSize)
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b.uint32(fh.UncompressedSize)
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}
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_, err = w.cw.Write(buf)
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return err
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}
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