ml
30 lines
759 B
Go
30 lines
759 B
Go
package compression
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/binary"
|
|
)
|
|
|
|
// PackControlWords packs and encodes the given words into a byte stream.
|
|
func PackControlWords(words []ControlWord) []byte {
|
|
buf := bytes.NewBuffer(nil)
|
|
controlBytes := uint32(len(words) * bytesPerControlWord)
|
|
|
|
_ = binary.Write(buf, binary.LittleEndian, controlBytes)
|
|
if controlBytes > 0 {
|
|
lastPacked := words[0].Packed(1)
|
|
|
|
for _, word := range words[1:] {
|
|
if (lastPacked.Value() == word) && (lastPacked.Times() < 0xFF) {
|
|
lastPacked = word.Packed(lastPacked.Times() + 1)
|
|
} else {
|
|
_ = binary.Write(buf, binary.LittleEndian, uint32(lastPacked))
|
|
lastPacked = word.Packed(1)
|
|
}
|
|
}
|
|
_ = binary.Write(buf, binary.LittleEndian, uint32(lastPacked))
|
|
}
|
|
|
|
return buf.Bytes()
|
|
}
|