source: josm/trunk/src/org/tukaani/xz/simple/SPARC.java@ 15851

Last change on this file since 15851 was 13350, checked in by stoecker, 7 years ago

see #15816 - add XZ support

File size: 1.6 KB
Line 
1/*
2 * BCJ filter for SPARC 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 SPARC implements SimpleFilter {
14 private final boolean isEncoder;
15 private int pos;
16
17 public SPARC(boolean isEncoder, int startPos) {
18 this.isEncoder = isEncoder;
19 pos = startPos;
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] == 0x40 && (buf[i + 1] & 0xC0) == 0x00)
28 || (buf[i] == 0x7F && (buf[i + 1] & 0xC0) == 0xC0)) {
29 int src = ((buf[i] & 0xFF) << 24)
30 | ((buf[i + 1] & 0xFF) << 16)
31 | ((buf[i + 2] & 0xFF) << 8)
32 | (buf[i + 3] & 0xFF);
33 src <<= 2;
34
35 int dest;
36 if (isEncoder)
37 dest = src + (pos + i - off);
38 else
39 dest = src - (pos + i - off);
40
41 dest >>>= 2;
42 dest = (((0 - ((dest >>> 22) & 1)) << 22) & 0x3FFFFFFF)
43 | (dest & 0x3FFFFF) | 0x40000000;
44
45 buf[i] = (byte)(dest >>> 24);
46 buf[i + 1] = (byte)(dest >>> 16);
47 buf[i + 2] = (byte)(dest >>> 8);
48 buf[i + 3] = (byte)dest;
49 }
50 }
51
52 i -= off;
53 pos += i;
54 return i;
55 }
56}
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