44167aa47a
* upgrade k8s package version Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io> * Script upgrade and code formatting. Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io> Signed-off-by: hongzhouzi <hongzhouzi@kubesphere.io>
73 lines
2.0 KiB
Go
73 lines
2.0 KiB
Go
/*
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Copyright The ORAS Authors.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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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*/
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package content
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import (
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"compress/gzip"
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"fmt"
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"io"
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"github.com/containerd/containerd/content"
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)
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// NewGunzipWriter wrap a writer with a gunzip, so that the stream is gunzipped
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//
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// By default, it calculates the hash when writing. If the option `skipHash` is true,
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// it will skip doing the hash. Skipping the hash is intended to be used only
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// if you are confident about the validity of the data being passed to the writer,
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// and wish to save on the hashing time.
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func NewGunzipWriter(writer content.Writer, opts ...WriterOpt) content.Writer {
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// process opts for default
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wOpts := DefaultWriterOpts()
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for _, opt := range opts {
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if err := opt(&wOpts); err != nil {
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return nil
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}
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}
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return NewPassthroughWriter(writer, func(r io.Reader, w io.Writer, done chan<- error) {
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gr, err := gzip.NewReader(r)
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if err != nil {
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done <- fmt.Errorf("error creating gzip reader: %v", err)
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return
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}
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// write out the uncompressed data
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b := make([]byte, wOpts.Blocksize, wOpts.Blocksize)
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for {
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var n int
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n, err = gr.Read(b)
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if err != nil && err != io.EOF {
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err = fmt.Errorf("GunzipWriter data read error: %v\n", err)
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break
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}
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l := n
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if n > len(b) {
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l = len(b)
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}
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if _, err2 := w.Write(b[:l]); err2 != nil {
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err = fmt.Errorf("GunzipWriter: error writing to underlying writer: %v", err2)
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break
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}
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if err == io.EOF {
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// clear the error
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err = nil
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break
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}
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}
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gr.Close()
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done <- err
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}, opts...)
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}
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