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move source files to own subdirectory
[rsbs2] / src / filesystem.c
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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 "filesystem.h"
14
15struct file_entry* get_next_file(unsigned char *fw, int len)
16{
17 static unsigned char *pos;
18 static unsigned char *start;
19 static unsigned char *end;
20 static struct file_entry fent;
21 int name_length;
22
23 if (fw != NULL && len != 0) {
24 pos = fw + 0x28;
25
26#if 0
27 printf("Start of filesystem: 0x%08x\n", *((unsigned int*)pos));
28#endif
29 start = fw;
30 pos = fw + *((unsigned int*)pos);
31 end = fw + len;
32 }
33
34 fent.unknown = *pos;
35 pos++;
36
37 if (fent.unknown == 0x00) {
38 /* EOF */
39 int fill = (4 - ((pos - start) % 4)) % 4;
40 int i;
41
42 for (i = 0; i < fill; i++) {
43 if (*pos != 0xff) {
44 fprintf(stderr, "Wrong fill byte after EOF: 0x%02x, aborting!\n", *pos);
45 exit(1);
46 }
47 pos++;
48 }
49
50 if (pos != end) {
51 fprintf(stderr, "EOF marker not at end-of-file %p <-> %p, aborting!\n", pos, end);
52 exit(1);
53 }
54
55 return NULL;
56 }
57
58
59 name_length = *((unsigned int*)pos);
60 pos += 4;
61
62 fent.length = *((unsigned int*)pos);
63 pos += 4;
64
65 if ((fent.length > (end - pos)) ||
66 (name_length > (end - pos))) {
67 printf("EOF reached without hitting EOF marker, aborting "
68 "(unknown: 0x%02x, namelen: 0x%08x, contentlen: 0x%08x!\n",
69 fent.unknown, name_length, fent.length);
70 exit(1);
71 }
72
73 fent.name = (char*)pos;
74 pos += name_length;
75
76 fent.start = pos;
77 pos += fent.length;
78
79 return &fent;
80}
81
82void extract_files(unsigned char *fw, int len)
83{
84 struct file_entry *fent;
85
86 fent = get_next_file(fw, len);
87
88 while (fent) {
89 printf("%s: unknown: 0x%02x, length: %d, ",
90 fent->name, fent->unknown, fent->length);
91
92 if (fent->length > 0) {
93 write_file(extracted_file(fent->name), fent->start, fent->length);
94 if (*((unsigned int*)fent->start) == LZ_MAGIC) {
95 char *lzname;
96 unsigned char *outbuf;
97 unsigned int outlen;
98
99 if ((lzname = strdup(fent->name)) == NULL) {
100 perror("strdup");
101 exit(1);
102 }
103
104 if (!strcmp(lzname + strlen(lzname) - 4 , ".lz")) {
105 fprintf(stderr, "Ugh, can't derive filename...\n");
106 exit(1);
107 }
108 lzname[strlen(lzname) - 3] = 0x00;
109
110 printf("%s: packed file found, ", lzname);
111
112 outbuf = extract_lz_file(fent->start, &outlen, 0);
113 write_file(extracted_file((char*)lzname), outbuf, outlen);
114
115 free(outbuf);
116 free(lzname);
117 } else if (!strcmp(fent->name, "firmware")) {
118 unsigned char *lzpos;
119 char lzname[128];
120
121 bzero(lzname, sizeof(lzname));
122 strcpy(lzname, "firmware.");
123
124 lzpos = fent->start + *((unsigned int*)(fent->start + 0x20));
125 memcpy(lzname + strlen(lzname), lzpos - 4, 4);
126 lzpos += 4;
127 if (*((unsigned int*)(lzpos)) == LZ_MAGIC) {
128 unsigned char *outbuf;
129 unsigned int outlen;
130
131 printf("%s: compressed firmware part found", lzname);
132 outbuf = extract_lz_file(lzpos, &outlen, 1);
133 printf(", ");
134 write_file(extracted_file((char*)lzname), outbuf, outlen);
135
136 free(outbuf);
137 }
138 }
139 } else {
140 printf(", ignoring...\n");
141 }
142 fent = get_next_file(NULL, 0);
143 }
144}
145
146void replace_add_file(unsigned char *fw, int len, char *fwname, char *lname)
147{
148 fprintf(stderr, "%s: Implement me!\n", __func__);
149 exit(1);
150}
151
152void list_files(unsigned char *fw, int len)
153{
154 struct file_entry *fent;
155
156 for (fent = get_next_file(fw, len); fent != NULL; fent = get_next_file(NULL, 0)) {
157 printf("0x%x %8d %s\n", fent->unknown, fent->length, fent->name);
158 }
159
160}
161
162void mkdir_p(char *dir)
163{
164 char *copy, *parent;
165
166 if ((dir == NULL) || (!strcmp(dir, ".")))
167 return;
168
169 if ((copy = strdup(dir)) == NULL) {
170 perror("strdup");
171 exit(1);
172 }
173 parent = dirname(copy);
174 mkdir_p(parent);
175
176 errno = 0;
177 if (mkdir(dir, 0755) == -1) {
178 if (errno != EEXIST) {
179 fprintf(stderr, "%s: ", dir);
180 perror("mkdir");
181 exit(1);
182 }
183 }
184 free(copy);
185}
186
187void write_file(char *fname, unsigned char *buf, int len)
188{
189 char *filename_c, *dirn;
190 int fd;
191 int remaining;
192 int ret;
193
194 if ((filename_c = strdup(fname)) == NULL) {
195 perror("strdup");
196 exit(1);
197 }
198 dirn = dirname(filename_c);
199 mkdir_p(dirn);
200 free(filename_c);
201
202 if ((fd = open(fname, O_WRONLY|O_CREAT, 0644)) == -1) {
203 fprintf(stderr, "%s: ", fname);
204 perror("open");
205 exit(1);
206 }
207
208 remaining = len;
209
210 while(remaining) {
211 ret = write(fd, buf + (len - remaining), remaining);
212 if (ret < 0) {
213 perror("write");
214 exit(1);
215 }
216 remaining -= ret;
217 }
218
219 printf("%s written.\n", fname);
220
221 close(fd);
222}
223
224char *extracted_file(char *fname)
225{
226 static char filename[PATH_MAX];
227
228 strcpy(filename, "extracted/");
229 strcat(filename, fname);
230
231 return filename;
232}
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