The repeat method in LZDecoder[1] currently copies individual bytes in
a loop. This could be changed to do batch copies:
do {
//it is possible for the "repeat" to include content which
is going to be generated here
//so we have to limit ourselves to how much data is already
in the buffer (i.e. pos - back).
final int toCopy = Math.min(left, Math.min(bufSize - back,
pos - back));
System.arraycopy(buf, back, buf, pos, toCopy);
pos += toCopy;
back += toCopy;
left -= toCopy;
if (back == bufSize) {
back = 0;
}
} while (left > 0);
[1] -
https://git.tukaani.org/?p=xz-java.git;a=blob;f=src/org/tukaani/xz/lz/LZDecoder.java;h=85b2ca1117461c9f3143e3baf592ab261e2ad1ca;hb=refs/heads/master#l79
