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3264 decky 1
#!/usr/bin/env python
2
#
3
# Copyright (c) 2008 Martin Decky
4
# All rights reserved.
5
#
6
# Redistribution and use in source and binary forms, with or without
7
# modification, are permitted provided that the following conditions
8
# are met:
9
#
10
# - Redistributions of source code must retain the above copyright
11
#   notice, this list of conditions and the following disclaimer.
12
# - Redistributions in binary form must reproduce the above copyright
13
#   notice, this list of conditions and the following disclaimer in the
14
#   documentation and/or other materials provided with the distribution.
15
# - The name of the author may not be used to endorse or promote products
16
#   derived from this software without specific prior written permission.
17
#
18
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20
# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21
# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23
# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28
#
29
"""
30
FAT creator
31
"""
32
 
33
import sys
34
import os
35
import random
36
import xstruct
4153 mejdrech 37
import array
3264 decky 38
 
4153 mejdrech 39
exclude_names = set(['.svn'])
40
 
41
def align_up(size, alignment):
42
    "Return size aligned up to alignment"
43
 
44
    if (size % alignment == 0):
45
        return size
46
 
47
    return (((size / alignment) + 1) * alignment)
48
 
49
def subtree_size(root, cluster_size, dirent_size):
50
    "Recursive directory walk and calculate size"
51
 
52
    size = 0
53
    files = 2
54
 
55
    for name in os.listdir(root):
56
        canon = os.path.join(root, name)
57
 
58
        if (os.path.isfile(canon) and (not name in exclude_names)):
59
            size += align_up(os.path.getsize(canon), cluster_size)
60
            files += 1
61
 
62
        if (os.path.isdir(canon) and (not name in exclude_names)):
63
            size += subtree_size(canon, cluster_size, dirent_size)
64
            files += 1
65
 
66
    return size + align_up(files * dirent_size, cluster_size)
67
 
68
def root_entries(root):
69
    "Return number of root directory entries"
70
 
71
    return len(os.listdir(root))
72
 
73
def write_file(path, outf, cluster_size, data_start, fat, reserved_clusters):
74
    "Store the contents of a file"
75
 
76
    size = os.path.getsize(path)
77
    prev = -1
78
    first = 0
79
 
80
    inf = file(path, "r")
81
    rd = 0;
82
    while (rd < size):
83
        empty_cluster = fat.index(0)
84
        fat[empty_cluster] = 0xffff
85
 
86
        if (prev != -1):
87
            fat[prev] = empty_cluster
88
        else:
89
            first = empty_cluster
90
 
91
        prev = empty_cluster
92
 
93
        data = inf.read(cluster_size);
94
        outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size)
95
        outf.write(data)
96
        rd += len(data)
97
    inf.close()
98
 
99
    return first, size
100
 
101
def write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster):
102
    "Store the contents of a directory"
103
 
104
    length = len(directory)
105
    size = length * dirent_size
106
    prev = -1
107
    first = 0
108
 
109
    i = 0
110
    rd = 0;
111
    while (rd < size):
112
        if (prev != -1):
113
            empty_cluster = fat.index(0)
114
            fat[empty_cluster] = 0xffff
115
            fat[prev] = empty_cluster
116
        else:
117
            first = empty_cluster
118
 
119
        prev = empty_cluster
120
 
121
        data = ''
122
        data_len = 0
123
        while ((i < length) and (data_len < cluster_size)):
124
            if (i == 0):
125
                directory[i].cluster = empty_cluster
126
 
127
            data += directory[i].pack()
128
            data_len += dirent_size
129
            i += 1
130
 
131
        outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size)
132
        outf.write(data)
133
        rd += len(data)
134
 
135
    return first, size
136
 
137
DIR_ENTRY = """little:
138
    char name[8]               /* file name */
139
    char ext[3]                /* file extension */
140
    uint8_t attr               /* file attributes */
4581 mejdrech 141
    uint8_t lcase              /* file name case (NT extension) */
4153 mejdrech 142
    uint8_t ctime_fine         /* create time (fine resolution) */
143
    uint16_t ctime             /* create time */
144
    uint16_t cdate             /* create date */
145
    uint16_t adate             /* access date */
146
    padding[2]                 /* EA-index */
147
    uint16_t mtime             /* modification time */
148
    uint16_t mdate             /* modification date */
149
    uint16_t cluster           /* first cluster */
150
    uint32_t size              /* file size */
151
"""
152
 
153
DOT_DIR_ENTRY = """little:
154
    uint8_t signature          /* 0x2e signature */
155
    char name[7]               /* empty */
156
    char ext[3]                /* empty */
157
    uint8_t attr               /* file attributes */
158
    padding[1]                 /* reserved for NT */
159
    uint8_t ctime_fine         /* create time (fine resolution) */
160
    uint16_t ctime             /* create time */
161
    uint16_t cdate             /* create date */
162
    uint16_t adate             /* access date */
163
    padding[2]                 /* EA-index */
164
    uint16_t mtime             /* modification time */
165
    uint16_t mdate             /* modification date */
166
    uint16_t cluster           /* first cluster */
167
    uint32_t size              /* file size */
168
"""
169
 
170
DOTDOT_DIR_ENTRY = """little:
171
    uint8_t signature[2]       /* 0x2e signature */
172
    char name[6]               /* empty */
173
    char ext[3]                /* empty */
174
    uint8_t attr               /* file attributes */
175
    padding[1]                 /* reserved for NT */
176
    uint8_t ctime_fine         /* create time (fine resolution) */
177
    uint16_t ctime             /* create time */
178
    uint16_t cdate             /* create date */
179
    uint16_t adate             /* access date */
180
    padding[2]                 /* EA-index */
181
    uint16_t mtime             /* modification time */
182
    uint16_t mdate             /* modification date */
183
    uint16_t cluster           /* first cluster */
184
    uint32_t size              /* file size */
185
"""
186
 
187
def mangle_fname(name):
188
    # FIXME: filter illegal characters
189
    parts = name.split('.')
190
 
191
    if (len(parts) > 0):
192
        fname = parts[0]
193
    else:
194
        fname = ''
195
 
196
    return (fname + '          ').upper()[0:8]
197
 
198
def mangle_ext(name):
199
    # FIXME: filter illegal characters
200
    parts = name.split('.')
201
 
202
    if (len(parts) > 1):
203
        ext = parts[1]
204
    else:
205
        ext = ''
206
 
207
    return (ext + '   ').upper()[0:3]
208
 
209
def create_dirent(name, directory, cluster, size):
210
    dir_entry = xstruct.create(DIR_ENTRY)
211
 
212
    dir_entry.name = mangle_fname(name)
213
    dir_entry.ext = mangle_ext(name)
214
 
215
    if (directory):
216
        dir_entry.attr = 0x30
217
    else:
218
        dir_entry.attr = 0x20
219
 
4581 mejdrech 220
    dir_entry.lcase = 0x18
4153 mejdrech 221
    dir_entry.ctime_fine = 0 # FIXME
222
    dir_entry.ctime = 0 # FIXME
223
    dir_entry.cdate = 0 # FIXME
224
    dir_entry.adate = 0 # FIXME
225
    dir_entry.mtime = 0 # FIXME
226
    dir_entry.mdate = 0 # FIXME
227
    dir_entry.cluster = cluster
228
 
229
    if (directory):
230
        dir_entry.size = 0
231
    else:
232
        dir_entry.size = size
233
 
234
    return dir_entry
235
 
236
def create_dot_dirent(empty_cluster):
237
    dir_entry = xstruct.create(DOT_DIR_ENTRY)
238
 
239
    dir_entry.signature = 0x2e
240
    dir_entry.name = '       '
241
    dir_entry.ext = '   '
242
    dir_entry.attr = 0x10
243
 
244
    dir_entry.ctime_fine = 0 # FIXME
245
    dir_entry.ctime = 0 # FIXME
246
    dir_entry.cdate = 0 # FIXME
247
    dir_entry.adate = 0 # FIXME
248
    dir_entry.mtime = 0 # FIXME
249
    dir_entry.mdate = 0 # FIXME
250
    dir_entry.cluster = empty_cluster
251
    dir_entry.size = 0
252
 
253
    return dir_entry
254
 
255
def create_dotdot_dirent(parent_cluster):
256
    dir_entry = xstruct.create(DOTDOT_DIR_ENTRY)
257
 
258
    dir_entry.signature = [0x2e, 0x2e]
259
    dir_entry.name = '      '
260
    dir_entry.ext = '   '
261
    dir_entry.attr = 0x10
262
 
263
    dir_entry.ctime_fine = 0 # FIXME
264
    dir_entry.ctime = 0 # FIXME
265
    dir_entry.cdate = 0 # FIXME
266
    dir_entry.adate = 0 # FIXME
267
    dir_entry.mtime = 0 # FIXME
268
    dir_entry.mdate = 0 # FIXME
269
    dir_entry.cluster = parent_cluster
270
    dir_entry.size = 0
271
 
272
    return dir_entry
273
 
274
def recursion(head, root, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, parent_cluster):
275
    "Recursive directory walk"
276
 
277
    directory = []
278
 
279
    if (not head):
280
        # Directory cluster preallocation
281
        empty_cluster = fat.index(0)
282
        fat[empty_cluster] = 0xffff
283
 
284
        directory.append(create_dot_dirent(empty_cluster))
285
        directory.append(create_dotdot_dirent(parent_cluster))
286
    else:
287
        empty_cluster = 0
288
 
289
    for name in os.listdir(root):
290
        canon = os.path.join(root, name)
291
 
292
        if (os.path.isfile(canon) and (not name in exclude_names)):
293
            rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters)
294
            directory.append(create_dirent(name, False, rv[0], rv[1]))
295
 
296
        if (os.path.isdir(canon) and (not name in exclude_names)):
297
            rv = recursion(False, canon, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, empty_cluster)
298
            directory.append(create_dirent(name, True, rv[0], rv[1]))
299
 
300
    if (head):
301
        outf.seek(root_start)
302
        for dir_entry in directory:
303
            outf.write(dir_entry.pack())
304
    else:
305
        return write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster)
306
 
3264 decky 307
BOOT_SECTOR = """little:
308
    uint8_t jmp[3]             /* jump instruction */
309
    char oem[8]                /* OEM string */
310
    uint16_t sector            /* bytes per sector */
311
    uint8_t cluster            /* sectors per cluster */
312
    uint16_t reserved          /* reserved sectors */
313
    uint8_t fats               /* number of FATs */
314
    uint16_t rootdir           /* root directory entries */
315
    uint16_t sectors           /* total number of sectors */
316
    uint8_t descriptor         /* media descriptor */
317
    uint16_t fat_sectors       /* sectors per single FAT */
318
    uint16_t track_sectors     /* sectors per track */
319
    uint16_t heads             /* number of heads */
320
    uint32_t hidden            /* hidden sectors */
321
    uint32_t sectors_big       /* total number of sectors (if sectors == 0) */
322
 
323
    /* Extended BIOS Parameter Block */
324
    uint8_t drive              /* physical drive number */
325
    padding[1]                 /* reserved (current head) */
326
    uint8_t extboot_signature  /* extended boot signature */
327
    uint32_t serial            /* serial number */
328
    char label[11]             /* volume label */
329
    char fstype[8]             /* filesystem type */
330
    padding[448]               /* boot code */
331
    uint8_t boot_signature[2]  /* boot signature */
332
"""
333
 
4153 mejdrech 334
EMPTY_SECTOR = """little:
335
    padding[512]               /* empty sector data */
336
"""
337
 
338
FAT_ENTRY = """little:
339
    uint16_t next              /* FAT16 entry */
340
"""
341
 
3264 decky 342
def usage(prname):
343
    "Print usage syntax"
344
    print prname + " <PATH> <IMAGE>"
345
 
346
def main():
347
    if (len(sys.argv) < 3):
348
        usage(sys.argv[0])
349
        return
350
 
351
    path = os.path.abspath(sys.argv[1])
352
    if (not os.path.isdir(path)):
353
        print "<PATH> must be a directory"
354
        return
355
 
4153 mejdrech 356
    fat16_clusters = 4096
357
 
358
    sector_size = 512
359
    cluster_size = 4096
360
    dirent_size = 32
361
    fatent_size = 2
362
    fat_count = 2
363
    reserved_clusters = 2
364
 
365
    # Make sure the filesystem is large enought for FAT16
366
    size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size
367
    while (size / cluster_size < fat16_clusters):
368
        if (cluster_size > sector_size):
369
            cluster_size /= 2
370
            size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size
371
        else:
372
            size = fat16_clusters * cluster_size + reserved_clusters * cluster_size
373
 
374
    root_size = align_up(root_entries(path) * dirent_size, cluster_size)
375
 
376
    fat_size = align_up(align_up(size, cluster_size) / cluster_size * fatent_size, sector_size)
377
 
378
    sectors = (cluster_size + fat_count * fat_size + root_size + size) / sector_size
379
    root_start = cluster_size + fat_count * fat_size
380
    data_start = root_start + root_size
381
 
3264 decky 382
    outf = file(sys.argv[2], "w")
383
 
384
    boot_sector = xstruct.create(BOOT_SECTOR)
385
    boot_sector.jmp = [0xEB, 0x3C, 0x90]
386
    boot_sector.oem = "MSDOS5.0"
4153 mejdrech 387
    boot_sector.sector = sector_size
388
    boot_sector.cluster = cluster_size / sector_size
389
    boot_sector.reserved = cluster_size / sector_size
390
    boot_sector.fats = fat_count
391
    boot_sector.rootdir = root_size / dirent_size
392
    if (sectors <= 65535):
393
        boot_sector.sectors = sectors
394
    else:
395
        boot_sector.sectors = 0
3264 decky 396
    boot_sector.descriptor = 0xF8
4153 mejdrech 397
    boot_sector.fat_sectors = fat_size / sector_size
398
    boot_sector.track_sectors = 63
399
    boot_sector.heads = 6
3264 decky 400
    boot_sector.hidden = 0
4153 mejdrech 401
    if (sectors > 65535):
402
        boot_sector.sectors_big = sectors
403
    else:
404
        boot_sector.sectors_big = 0
3264 decky 405
 
4153 mejdrech 406
    boot_sector.drive = 0x80
3264 decky 407
    boot_sector.extboot_signature = 0x29
4153 mejdrech 408
    boot_sector.serial = random.randint(0, 0x7fffffff)
3264 decky 409
    boot_sector.label = "HELENOS"
410
    boot_sector.fstype = "FAT16   "
411
    boot_sector.boot_signature = [0x55, 0xAA]
412
 
413
    outf.write(boot_sector.pack())
414
 
4153 mejdrech 415
    empty_sector = xstruct.create(EMPTY_SECTOR)
416
 
417
    # Reserved sectors
418
    for i in range(1, cluster_size / sector_size):
419
        outf.write(empty_sector.pack())
420
 
421
    # FAT tables
422
    for i in range(0, fat_count):
423
        for j in range(0, fat_size / sector_size):
424
            outf.write(empty_sector.pack())
425
 
426
    # Root directory
427
    for i in range(0, root_size / sector_size):
428
        outf.write(empty_sector.pack())
429
 
430
    # Data
431
    for i in range(0, size / sector_size):
432
        outf.write(empty_sector.pack())
433
 
434
    fat = array.array('L', [0] * (fat_size / fatent_size))
435
    fat[0] = 0xfff8
436
    fat[1] = 0xffff
437
 
438
    recursion(True, path, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, 0)
439
 
440
    # Store FAT
441
    fat_entry = xstruct.create(FAT_ENTRY)
442
    for i in range(0, fat_count):
443
        outf.seek(cluster_size + i * fat_size)
444
        for j in range(0, fat_size / fatent_size):
445
            fat_entry.next = fat[j]
446
            outf.write(fat_entry.pack())
447
 
3264 decky 448
    outf.close()
449
 
450
if __name__ == '__main__':
451
    main()