source: josm/trunk/src/org/tukaani/xz/simple/ARM.java@ 15948

Last change on this file since 15948 was 13350, checked in by stoecker, 7 years ago

see #15816 - add XZ support

File size: 1.3 KB
Line 
1/*
2 * BCJ filter for little endian ARM instructions
3 *
4 * Authors: Lasse Collin <lasse.collin@tukaani.org>
5 * Igor Pavlov <http://7-zip.org/>
6 *
7 * This file has been put into the public domain.
8 * You can do whatever you want with this file.
9 */
10
11package org.tukaani.xz.simple;
12
13public final class ARM implements SimpleFilter {
14 private final boolean isEncoder;
15 private int pos;
16
17 public ARM(boolean isEncoder, int startPos) {
18 this.isEncoder = isEncoder;
19 pos = startPos + 8;
20 }
21
22 public int code(byte[] buf, int off, int len) {
23 int end = off + len - 4;
24 int i;
25
26 for (i = off; i <= end; i += 4) {
27 if ((buf[i + 3] & 0xFF) == 0xEB) {
28 int src = ((buf[i + 2] & 0xFF) << 16)
29 | ((buf[i + 1] & 0xFF) << 8)
30 | (buf[i] & 0xFF);
31 src <<= 2;
32
33 int dest;
34 if (isEncoder)
35 dest = src + (pos + i - off);
36 else
37 dest = src - (pos + i - off);
38
39 dest >>>= 2;
40 buf[i + 2] = (byte)(dest >>> 16);
41 buf[i + 1] = (byte)(dest >>> 8);
42 buf[i] = (byte)dest;
43 }
44 }
45
46 i -= off;
47 pos += i;
48 return i;
49 }
50}
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