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11 package edu.internet2.middleware.grouperInstallerExt.org.tukaani.xz.simple;
12
13 public final class IA64 implements SimpleFilter {
14 private static final int[] BRANCH_TABLE = {
15 0, 0, 0, 0, 0, 0, 0, 0,
16 0, 0, 0, 0, 0, 0, 0, 0,
17 4, 4, 6, 6, 0, 0, 7, 7,
18 4, 4, 0, 0, 4, 4, 0, 0 };
19
20 private final boolean isEncoder;
21 private int pos;
22
23 public IA64(boolean isEncoder, int startPos) {
24 this.isEncoder = isEncoder;
25 pos = startPos;
26 }
27
28 public int code(byte[] buf, int off, int len) {
29 int end = off + len - 16;
30 int i;
31
32 for (i = off; i <= end; i += 16) {
33 int instrTemplate = buf[i] & 0x1F;
34 int mask = BRANCH_TABLE[instrTemplate];
35
36 for (int slot = 0, bitPos = 5; slot < 3; ++slot, bitPos += 41) {
37 if (((mask >>> slot) & 1) == 0)
38 continue;
39
40 int bytePos = bitPos >>> 3;
41 int bitRes = bitPos & 7;
42
43 long instr = 0;
44 for (int j = 0; j < 6; ++j)
45 instr |= (buf[i + bytePos + j] & 0xFFL) << (8 * j);
46
47 long instrNorm = instr >>> bitRes;
48
49 if (((instrNorm >>> 37) & 0x0F) != 0x05
50 || ((instrNorm >>> 9) & 0x07) != 0x00)
51 continue;
52
53 int src = (int)((instrNorm >>> 13) & 0x0FFFFF);
54 src |= ((int)(instrNorm >>> 36) & 1) << 20;
55 src <<= 4;
56
57 int dest;
58 if (isEncoder)
59 dest = src + (pos + i - off);
60 else
61 dest = src - (pos + i - off);
62
63 dest >>>= 4;
64
65 instrNorm &= ~(0x8FFFFFL << 13);
66 instrNorm |= (dest & 0x0FFFFFL) << 13;
67 instrNorm |= (dest & 0x100000L) << (36 - 20);
68
69 instr &= (1 << bitRes) - 1;
70 instr |= instrNorm << bitRes;
71
72 for (int j = 0; j < 6; ++j)
73 buf[i + bytePos + j] = (byte)(instr >>> (8 * j));
74 }
75 }
76
77 i -= off;
78 pos += i;
79 return i;
80 }
81 }