GameReverseScripts/sllz.c at main · LinkOFF7/GameReverseScripts · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
/*
Simple LZSS used in SEGA 0.1
by Luigi Auriemma
e-mail: aluigi@autistici.org
web:    aluigi.org

Used in Yakuza 3 and Binary Domain.

    bytes   description
    4       SLLZ
    1       0 for little endian, 1 for big
    1       ???
    2       0x10
    4       uncompressed size
    4       compressed size
    x       compressed data
*/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#define ext ".dat"

#define unyakuza_bswap32(n) \
        (((n & 0xff000000) >> 24) | \
         ((n & 0x00ff0000) >>  8) | \
         ((n & 0x0000ff00) <<  8) | \
         ((n & 0x000000ff) << 24))


int unyakuza(unsigned char *in, int insz, unsigned char *out, int outsz, int check_head) {
    typedef struct {
        unsigned char   sign[4];
        unsigned char   endian;
        unsigned char   dummy;
        unsigned short  zoff;   // type or data offset?
        unsigned int    size;
        unsigned int    zsize;
    } yakuza_t;

    yakuza_t        *yakuza;
    int             i,
                    d,
                    a,
                    b,
                    op;
    unsigned char   *p  = in,
                    *o  = out,
                    *il = in + insz,
                    *ol = out + outsz;

    if(!in || (insz < 0) || !out || (outsz < 0)) return(-1);

    if(check_head) {
        if(insz < sizeof(yakuza_t)) return(-2);
        yakuza = (yakuza_t *)p;
        if(memcmp(yakuza->sign, "SLLZ", 4)) return(-3);
        if(yakuza->endian) {
            yakuza->zoff  = (yakuza->zoff >> 8) | (yakuza->zoff << 8);
            yakuza->size  = unyakuza_bswap32(yakuza->size);
            yakuza->zsize = unyakuza_bswap32(yakuza->zsize);
        }
        if(yakuza->zoff != 0x10) return(-4);
        if(yakuza->size > outsz) return(-5);
        if(yakuza->zsize > insz) return(-6);
        p += 0x10;
    }

    b = *p++;
    a = 8;
    while(o < ol) {
        if(p >= il) return(-7);

        if(b & 0x80) op = 1;
        else         op = 0;

        b <<= 1;
        a--;
        if(!a) {
            b = *p++;
            a = 8;
        }

        if(op) {
            d = ((p[0] >> 4) | (p[1] << 4)) + 1;
            for(i = (p[0] & 15) + 3; i > 0; i--) {
                if(o >= ol) break;
                *o = *(o - d);
                o++;
            }
            p += 2;
        } else {
            if(o >= ol) break;
            *o++ = *p++;
        }
    }
    return(o - out);
}

int main(int argc, char *argv[]){
	if(argc < 2) return 0;
	FILE 	*f;
	int 	size;
	char 	output_name[100];

	// output name
	strcat(output_name, argv[1]);
	strcat(output_name, ext);

	// open file
	f = fopen(argv[1], "rb");

	if(f){
		// get size
		fseek(f, 0, SEEK_END);
		int lSize = ftell(f);

		//get uncompressed size
		fseek(f, 8, SEEK_SET);
		fread(&size, sizeof(int), 1, f);
		fseek(f, 0, SEEK_SET);

		// allocate buffer
		char *buffer = malloc(lSize);
		fread(buffer, lSize, 1, f);

		// decompress
		char *unc_buf = malloc(size);
		unyakuza(buffer, lSize, unc_buf, size, 1);

		// writing to file
		FILE *o = fopen(output_name, "wb");
		fwrite(unc_buf, 1, size, o);

		printf("Done.");

		// free memory
		fclose(f);
		fclose(o);
		free(buffer);
		free(unc_buf);

		return 0;
	} else{
		printf("Can't get access to file.");
		fclose(f);
		return 0;
	}
}