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compressor.go
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compressor.go
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/**
* OpenBmclAPI (Golang Edition)
* Copyright (C) 2024 Kevin Z <zyxkad@gmail.com>
* All rights reserved
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package main
import (
"compress/gzip"
"compress/zlib"
"io"
)
type Compressor string
const (
NullCompressor Compressor = ""
ZlibCompressor Compressor = "zlib"
GzipCompressor Compressor = "gzip"
)
func (c Compressor) Ext() string {
switch c {
case NullCompressor:
return ""
case ZlibCompressor:
return ".zz"
case GzipCompressor:
return ".gz"
default:
panic("Unknown compressor: " + c)
}
}
// Decompress the reader
func (c Compressor) WrapReader(r io.Reader) (io.Reader, error) {
switch c {
case NullCompressor:
return r, nil
case ZlibCompressor:
return zlib.NewReader(r)
case GzipCompressor:
return gzip.NewReader(r)
default:
panic("Unknown compressor: " + c)
}
}
type nopWriteCloser struct {
io.Writer
}
func (nopWriteCloser) Close() error {
return nil
}
// Compress the writer
func (c Compressor) WrapWriter(w io.Writer) io.WriteCloser {
switch c {
case NullCompressor:
return nopWriteCloser{w}
case ZlibCompressor:
return zlib.NewWriter(w)
case GzipCompressor:
return gzip.NewWriter(w)
default:
panic("Unknown compressor: " + c)
}
}