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[rsbs2] / extract.c
1 #include <sys/stat.h>
2 #include <sys/types.h>
3 #include <limits.h>
4 #include <fcntl.h>
5 #include <stdio.h>
6 #include <stdlib.h>
7 #include <strings.h>
8 #include <string.h>
9 #include <unistd.h>
10 #include <errno.h>
11 #include <libgen.h>
12 #include "rsb-lz.h"
13 #include "extract.h"
14
15 void extract_files(unsigned char *fw, int len)
16 {
17 unsigned char *pos;
18 unsigned int length;
19 unsigned char unknown[5];
20 char *name;
21
22 pos = fw + 0x28;
23 printf("Start of filesystem: 0x%08x\n", *((unsigned int*)pos));
24
25 pos = fw + *((unsigned int*)pos);
26
27 while (pos < (fw + len)) {
28 unknown[0] = *pos; pos++;
29 unknown[1] = *pos; pos++;
30 unknown[2] = *pos; pos++;
31 unknown[3] = *pos; pos++;
32 unknown[4] = *pos; pos++;
33 length = *((unsigned int*)pos);
34 pos += 4;
35 name = (char*)pos;
36 pos += strlen(name) + 1;
37
38 if ((pos + length) > (fw + len)) {
39 printf("EOF reached\n");
40 break;
41 }
42 printf("%s: unknown: %02x %02x %02x %02x %02x, length: %d",
43 name, unknown[0], unknown[1], unknown[2], unknown[3],
44 unknown[4], length);
45
46 if (length > 0) {
47 write_file(name, pos, length);
48 if (*((unsigned int*)pos) == LZ_MAGIC) {
49 char *lzname;
50
51 if ((lzname = strdup(name)) == NULL) {
52 perror("strdup");
53 exit(1);
54 }
55
56 if (!strcmp(lzname + strlen(lzname) - 4 , ".lz")) {
57 fprintf(stderr, "Ugh, can't derive filename...\n");
58 exit(1);
59 }
60 lzname[strlen(lzname) - 3] = 0x00;
61
62 printf("%s: packed file found", lzname);
63
64 extract_lz_file(pos, (unsigned char*)lzname);
65 free(lzname);
66 } else if (!strcmp(name, "firmware")) {
67 unsigned char *lzpos;
68 char lzname[128];
69
70 bzero(lzname, sizeof(lzname));
71 strcpy(lzname, "firmware.");
72
73 lzpos = pos + *((unsigned int*)(pos + 0x20));
74 memcpy(lzname + strlen(lzname), lzpos - 4, 4);
75 lzpos += 4;
76 if (*((unsigned int*)(lzpos)) == LZ_MAGIC) {
77 printf("%s: compressed firmware part found", lzname);
78 extract_lz_file(lzpos, (unsigned char*)lzname);
79 }
80 }
81 }
82
83 pos += length;
84
85 }
86 }
87
88 void mkdir_p(char *dir)
89 {
90 char *copy, *parent;
91
92 if ((dir == NULL) || (!strcmp(dir, ".")))
93 return;
94
95 if ((copy = strdup(dir)) == NULL) {
96 perror("strdup");
97 exit(1);
98 }
99 parent = dirname(copy);
100 mkdir_p(parent);
101
102 errno = 0;
103 if (mkdir(dir, 0755) == -1) {
104 if (errno != EEXIST) {
105 fprintf(stderr, "%s: ", dir);
106 perror("mkdir");
107 exit(1);
108 }
109 }
110 free(copy);
111 }
112
113 void write_file(char *fname, unsigned char *buf, int len)
114 {
115 char filename[PATH_MAX];
116 char *filename_c, *dirn;
117 int fd;
118 int remaining;
119 int ret;
120
121 strcpy(filename, "extracted/");
122 strcat(filename, fname);
123
124 if ((filename_c = strdup(filename)) == NULL) {
125 perror("strdup");
126 exit(1);
127 }
128 dirn = dirname(filename_c);
129 mkdir_p(dirn);
130 free(filename_c);
131
132 if ((fd = open(filename, O_WRONLY|O_CREAT, 0644)) == -1) {
133 fprintf(stderr, "%s: ", filename);
134 perror("open");
135 exit(1);
136 }
137
138 remaining = len;
139
140 while(remaining) {
141 ret = write(fd, buf + (len - remaining), remaining);
142 if (ret < 0) {
143 perror("write");
144 exit(1);
145 }
146 remaining -= ret;
147 }
148
149 printf(", %s written.\n", filename);
150
151 close(fd);
152 }
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