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1.1 root 1: /*
2: * readdisk
3: *
4: * Read files from Amiga disk files
5: *
6: * Copyright 1996 Bernd Schmidt
7: */
8:
9: #include <sys/types.h>
10: #include <sys/stat.h>
11: #include <fcntl.h>
12: #include <unistd.h>
13: #include <errno.h>
14:
15: #include <stdio.h>
16: #include <stdlib.h>
17: #include <string.h>
18:
19: #include "amiga.h"
20:
21: unsigned char filemem[901120];
22:
23: typedef struct afile
24: {
25: struct afile *sibling;
26: unsigned char *data;
27: ULONG size;
28: char name[32];
29: } afile;
30:
31: typedef struct directory
32: {
33: struct directory *sibling;
34: struct directory *subdirs;
35: struct afile *files;
36: char name[32];
37: } directory;
38:
39: static ULONG readlong (unsigned char *buffer, int pos)
40: {
41: return ((*(buffer + pos) << 24) + (*(buffer + pos + 1) << 16)
42: + (*(buffer + pos + 2) << 8) + *(buffer + pos + 3));
43: }
44:
45: static afile *read_file (unsigned char *filebuf)
46: {
47: afile *a = (afile *)malloc(sizeof(afile));
48: int sizeleft;
49: unsigned char *datapos;
50: ULONG numblocks, blockpos;
51:
52: /* BCPL strings... Yuk. */
53: memset (a->name, 0, 32);
54: strncpy (a->name, (const char *)filebuf + 0x1B1, *(filebuf + 0x1B0));
55: sizeleft = a->size = readlong (filebuf, 0x144);
56: a->data = (unsigned char *)malloc(a->size);
57:
58: numblocks = readlong (filebuf, 0x8);
59: blockpos = 0x134;
60: datapos = a->data;
61: while (numblocks)
62: {
63: unsigned char *databuf = filemem + 512*readlong (filebuf, blockpos);
64: int readsize = sizeleft > 488 ? 488 : sizeleft;
65: memcpy (datapos, databuf + 0x18, readsize);
66: datapos += readsize;
67: sizeleft -= readsize;
68:
69: blockpos -= 4;
70: numblocks--;
71: if (blockpos < 0x18 && numblocks) {
72: filebuf = filemem + 512*readlong (filebuf, 0x1F8);
73: if (!filebuf) {
74: fprintf(stderr, "Disk structure corrupted. Use DISKDOCTOR to correct it.\n");
75: abort ();
76: }
77: }
78: }
79: return a;
80: }
81:
82: static directory *read_dir (unsigned char *dirbuf)
83: {
84: directory *d = (directory *)malloc(sizeof(directory));
85: ULONG hashsize;
86: ULONG i;
87:
88: memset (d->name, 0, 32);
89: strncpy (d->name, (const char *)dirbuf + 0x1B1, *(dirbuf + 0x1B0));
90: d->sibling = 0;
91: d->subdirs = 0;
92: d->files = 0;
93: hashsize = readlong (dirbuf, 0xc);
94: if (!hashsize)
95: hashsize = 72;
96: if (hashsize != 72)
97: fprintf(stderr, "Warning: Hash table with != 72 entries.\n");
98: for (i = 0; i < hashsize; i++) {
99: ULONG subblock = readlong (dirbuf, 0x18 + 4*i);
100: while (subblock) {
101: directory *subdir;
102: afile *subfile;
103: unsigned char *subbuf = filemem + 512*subblock;
104:
105: switch (readlong (subbuf, 0x1FC)) {
106: case 0x00000002:
107: subdir = read_dir (subbuf);
108: subdir->sibling = d->subdirs;
109: d->subdirs = subdir;
110: break;
111:
112: case 0xFFFFFFFD:
113: subfile = read_file (subbuf);
114: subfile->sibling = d->files;
115: d->files = subfile;
116: break;
117:
118: default:
119: fprintf(stderr, "Disk structure corrupted. Use DISKDOCTOR to correct it.\n");
120: abort ();
121: }
122: subblock = readlong (subbuf, 0x1F0);
123: }
124: }
125: return d;
126: }
127:
128: static void writedir(directory *dir)
129: {
130: directory *subdir;
131: afile *f;
132:
133: if (mkdir (dir->name, 0777) < 0 && errno != EEXIST) {
134: fprintf(stderr, "Could not create directory \"%s\". Giving up.\n", dir->name);
135: exit (20);
136: }
137: if (chdir (dir->name) < 0) {
138: fprintf(stderr, "Could not enter directory \"%s\". Giving up.\n", dir->name);
139: exit (20);
140: }
141: for (subdir = dir->subdirs; subdir; subdir = subdir->sibling)
142: writedir (subdir);
143: for (f = dir->files; f; f = f->sibling) {
144: int fd = creat (f->name, 0666);
145: if (fd < 0) {
146: fprintf(stderr, "Could not create file. Giving up.\n");
147: exit (20);
148: }
149: write (fd, f->data, f->size);
150: close (fd);
151: }
152: chdir ("..");
153: }
154:
155: int main(int argc, char **argv)
156: {
157: directory *root;
158: FILE *inf;
159: if (argc < 2 || argc > 3) {
160: fprintf(stderr, "Usage: readdisk <file> [<destdir>]\n");
161: exit (20);
162: }
163: inf = fopen(argv[1], "rb");
164: if (inf == NULL) {
165: fprintf(stderr, "can't open file\n");
166: exit (20);
167: }
168: fread(filemem, 1, 901120, inf);
169:
170: if (strncmp((const char *)filemem, "DOS\0", 4) != 0) {
171: fprintf(stderr, "Not a DOS disk.\n");
172: exit (20);
173: }
174: root = read_dir (filemem + 880*512);
175:
176: if (argc == 3)
177: if (chdir (argv[2]) < 0) {
178: fprintf(stderr, "Couldn't change to %s. Giving up.\n", argv[2]);
179: exit (20);
180: }
181: writedir (root);
182: return 0;
183: }
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