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// Copyright 2022 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package image
import (
"bytes"
"compress/zlib"
"encoding/base64"
"fmt"
"io"
"io/ioutil"
)
func Compress(rawData []byte) []byte {
var buffer bytes.Buffer
zlibWriter := zlib.NewWriter(&buffer)
_, err := zlibWriter.Write(rawData)
if err != nil {
panic(fmt.Sprintf("could not compress with zlib: %v", err))
}
err = zlibWriter.Close()
if err != nil {
panic(fmt.Sprintf("could not finalize compression with zlib: %v", err))
}
return buffer.Bytes()
}
func MustDecompress(compressed []byte) (data []byte, dtor func()) {
if len(compressed) == 0 {
return nil, func() {}
}
return mustDecompress(compressed)
}
func DecompressCheck(compressed []byte) error {
return decompressWriter(ioutil.Discard, compressed)
}
func decompressWriter(w io.Writer, compressed []byte) error {
if len(compressed) == 0 {
return nil
}
zlibReader, err := zlib.NewReader(bytes.NewReader(compressed))
if err != nil {
return fmt.Errorf("could not initialise zlib: %v", err)
}
if _, err := io.Copy(w, zlibReader); err != nil {
return fmt.Errorf("could not read data with zlib: %v", err)
}
return zlibReader.Close()
}
func DecodeB64(b64Data []byte) ([]byte, error) {
decoder := base64.NewDecoder(base64.StdEncoding, bytes.NewReader(b64Data))
rawData, err := io.ReadAll(decoder)
if err != nil {
return nil, fmt.Errorf("could not decode Base64: %v", err)
}
return rawData, nil
}
func EncodeB64(rawData []byte) []byte {
var buf bytes.Buffer
encoder := base64.NewEncoder(base64.StdEncoding, &buf)
_, err := encoder.Write(rawData)
if err != nil {
panic(fmt.Sprintf("could not encode Base64: %v", err))
}
err = encoder.Close()
if err != nil {
panic(fmt.Sprintf("could not finalize encoding to Base64: %v", err))
}
return buf.Bytes()
}
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