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util.go
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util.go
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package golpe
import (
"bytes"
"encoding/base64"
"fmt"
"log"
"github.com/mholt/archiver/v4"
)
// Base64Encode encodes a byte slice to a base64 URL-encoded string
func Base64Encode(data []byte) string {
return base64.URLEncoding.EncodeToString(data)
}
// Base64Decode decodes a base64 URL-encoded string to a byte slice
func Base64Decode(text string) []byte {
dec, err := base64.URLEncoding.DecodeString(text)
if err != nil {
log.Printf("Base64Decode: %v", err)
return nil
}
return dec
}
// Bin2String compresses a binary file and encodes it with base64
func Bin2String(data []byte) (res string) {
var compressedBuf bytes.Buffer
// Wrap the underlying writer with BZ2 compressor
compressor, err := archiver.Bz2{}.OpenWriter(&compressedBuf)
if err != nil {
log.Printf("Bin2String: %v", err)
return
}
defer compressor.Close()
// Compress the data
_, err = compressor.Write(data)
if err != nil {
log.Printf("Bin2String: Write to compressor failed: %v", err)
return
}
// Get the compressed binary data
compressedBin := compressedBuf.Bytes()
// Encode the compressed data to base64
res = Base64Encode(compressedBin)
if res == "" {
log.Println("Bin2String failed, empty string generated")
}
return
}
// ExtractFileFromString base64 decodes and decompresses using BZ2
func ExtractFileFromString(data string) (out []byte, err error) {
// Decode base64
decoded := Base64Decode(data)
if len(decoded) == 0 {
return nil, fmt.Errorf("ExtractFileFromString: Failed to decode")
}
var decompressBuf bytes.Buffer
// Wrap the underlying reader with BZ2 decompressor
decompressor, err := archiver.Bz2{}.OpenReader(bytes.NewReader(decoded))
if err != nil {
return nil, fmt.Errorf("ExtractFileFromString: %v", err)
}
defer decompressor.Close()
// Decompress the data
_, err = decompressBuf.ReadFrom(decompressor)
if err != nil {
return nil, fmt.Errorf("ExtractFileFromString: Read from decompressor failed: %v", err)
}
// Get the decompressed data
out = decompressBuf.Bytes()
return
}