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unlock-music-cli/algo/xm/xm_cipher.go

22 lines
373 B
Go

package xm
type xmCipher struct {
mask byte
encryptStartAt int
}
func newXmCipher(mask byte, encryptStartAt int) *xmCipher {
return &xmCipher{
mask: mask,
encryptStartAt: encryptStartAt,
}
}
func (c *xmCipher) Decrypt(buf []byte, offset int) {
for i := 0; i < len(buf); i++ {
if offset+i >= c.encryptStartAt {
buf[i] ^= c.mask
}
}
}