mirror of
https://github.com/nabbar/golib.git
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cd083bb53f
- adding package to compress/uncompress with reader or writer - refactor to allowing to use same source of io as result: io.reader or io.writer - optimize code & buf to limit mem use - rework variable to be thread safe Package archive/compress - add function DetectOnly to detect algo and return an updated reader but not the decompressor reader - update function Detect to use DetectOnly to limit duplication code Other - bump dependencies
86 lines
2.1 KiB
Go
86 lines
2.1 KiB
Go
/*
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* MIT License
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*
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* Copyright (c) 2020 Nicolas JUHEL
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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package compress
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import (
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"bufio"
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"io"
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)
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func Parse(s string) Algorithm {
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var alg = None
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if e := alg.UnmarshalText([]byte(s)); e != nil {
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return None
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} else {
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return alg
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}
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}
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func Detect(r io.Reader) (Algorithm, io.ReadCloser, error) {
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var (
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err error
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alg Algorithm
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rdr io.ReadCloser
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)
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if alg, rdr, err = DetectOnly(r); err != nil {
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return None, nil, err
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} else if rdr, err = alg.Reader(rdr); err != nil {
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return None, nil, err
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} else {
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return alg, rdr, nil
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}
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}
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func DetectOnly(r io.Reader) (Algorithm, io.ReadCloser, error) {
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var (
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err error
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alg Algorithm
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bfr = bufio.NewReader(r)
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buf []byte
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)
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if buf, err = bfr.Peek(6); err != nil {
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return None, nil, err
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}
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// Vérifier le type de compression
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switch {
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case Gzip.DetectHeader(buf): // gzip
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alg = Gzip
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case Bzip2.DetectHeader(buf): // bzip2
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alg = Bzip2
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case LZ4.DetectHeader(buf): // lz4
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alg = LZ4
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case XZ.DetectHeader(buf): // xz
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alg = XZ
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default:
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alg = None
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}
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return alg, io.NopCloser(bfr), err
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}
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