⬥ ID3 encoding/decoding library in Go ⬥
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40 lines
865 B

package util
import (
"bytes"
"fmt"
"io"
)
// Writes data to wr, if len(data) is less than lenNeeded - adds null bytes until written lenNeeded bytes
func WriteToExtent(wr io.Writer, data []byte, lenNeeded int) error {
if len(data) > lenNeeded {
return fmt.Errorf("length of given data bytes is bigger than length needed")
}
buff := new(bytes.Buffer)
for i := 0; i < lenNeeded; i++ {
if i < len(data) {
// write given data
err := buff.WriteByte(data[i])
if err != nil {
return fmt.Errorf("could not write byte: %s", err)
}
} else {
// write null bytes
err := buff.WriteByte(0)
if err != nil {
return fmt.Errorf("could not write byte: %s", err)
}
}
}
// write constructed buffer`s bytes
_, err := wr.Write(buff.Bytes())
if err != nil {
return fmt.Errorf("could not write to writer: %s", err)
}
return nil
}