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Member "lha-114i/src/larc.c" of archive lha-114i.tar.gz:
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1 /* ------------------------------------------------------------------------ */
2 /* LHa for UNIX */
3 /* larc.c -- extra *.lzs */
4 /* */
5 /* Modified Nobutaka Watazaki */
6 /* */
7 /* Ver. 1.14 Source All chagned 1995.01.14 N.Watazaki */
8 /* ------------------------------------------------------------------------ */
9 #include "lha.h"
10
11 /* ------------------------------------------------------------------------ */
12 static int flag, flagcnt, matchpos;
13 /* ------------------------------------------------------------------------ */
14 unsigned short
15 decode_c_lzs( /*void*/ )
16 {
17 if (getbits(1)) {
18 return getbits(8);
19 }
20 else {
21 matchpos = getbits(11);
22 return getbits(4) + 0x100;
23 }
24 }
25
26 /* ------------------------------------------------------------------------ */
27 unsigned short
28 decode_p_lzs( /*void*/ )
29 {
30 return (loc - matchpos - MAGIC0) & 0x7ff;
31 }
32
33 /* ------------------------------------------------------------------------ */
34 void
35 decode_start_lzs( /*void*/ )
36 {
37 init_getbits();
38 }
39
40 /* ------------------------------------------------------------------------ */
41 unsigned short
42 decode_c_lz5( /*void*/ )
43 {
44 int c;
45
46 if (flagcnt == 0) {
47 flagcnt = 8;
48 flag = getc(infile);
49 }
50 flagcnt--;
51 c = getc(infile);
52 if ((flag & 1) == 0) {
53 matchpos = c;
54 c = getc(infile);
55 matchpos += (c & 0xf0) << 4;
56 c &= 0x0f;
57 c += 0x100;
58 }
59 flag >>= 1;
60 return c;
61 }
62
63 /* ------------------------------------------------------------------------ */
64 unsigned short
65 decode_p_lz5( /*void*/ )
66 {
67 return (loc - matchpos - MAGIC5) & 0xfff;
68 }
69
70 /* ------------------------------------------------------------------------ */
71 void
72 decode_start_lz5( /*void*/ )
73 {
74 int i;
75
76 flagcnt = 0;
77 for (i = 0; i < 256; i++)
78 memset(&text[i * 13 + 18], i, 13);
79 for (i = 0; i < 256; i++)
80 text[256 * 13 + 18 + i] = i;
81 for (i = 0; i < 256; i++)
82 text[256 * 13 + 256 + 18 + i] = 255 - i;
83 memset(&text[256 * 13 + 512 + 18], 0, 128);
84 memset(&text[256 * 13 + 512 + 128 + 18], ' ', 128 - 18);
85 }