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1 | #!/usr/bin/env python |
1 | #!/usr/bin/env python |
2 | # |
2 | # |
3 | # Copyright (c) 2008 Martin Decky |
3 | # Copyright (c) 2008 Martin Decky |
4 | # All rights reserved. |
4 | # All rights reserved. |
5 | # |
5 | # |
6 | # Redistribution and use in source and binary forms, with or without |
6 | # Redistribution and use in source and binary forms, with or without |
7 | # modification, are permitted provided that the following conditions |
7 | # modification, are permitted provided that the following conditions |
8 | # are met: |
8 | # are met: |
9 | # |
9 | # |
10 | # - Redistributions of source code must retain the above copyright |
10 | # - Redistributions of source code must retain the above copyright |
11 | # notice, this list of conditions and the following disclaimer. |
11 | # notice, this list of conditions and the following disclaimer. |
12 | # - Redistributions in binary form must reproduce the above copyright |
12 | # - Redistributions in binary form must reproduce the above copyright |
13 | # notice, this list of conditions and the following disclaimer in the |
13 | # notice, this list of conditions and the following disclaimer in the |
14 | # documentation and/or other materials provided with the distribution. |
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 |
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. |
16 | # derived from this software without specific prior written permission. |
17 | # |
17 | # |
18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
28 | # |
28 | # |
29 | """ |
29 | """ |
30 | FAT creator |
30 | FAT creator |
31 | """ |
31 | """ |
32 | 32 | ||
33 | import sys |
33 | import sys |
34 | import os |
34 | import os |
35 | import random |
35 | import random |
36 | import xstruct |
36 | import xstruct |
37 | import array |
37 | import array |
38 | 38 | ||
39 | def align_up(size, alignment): |
39 | def align_up(size, alignment): |
40 | "Return size aligned up to alignment" |
40 | "Return size aligned up to alignment" |
41 | 41 | ||
42 | if (size % alignment == 0): |
42 | if (size % alignment == 0): |
43 | return size |
43 | return size |
44 | 44 | ||
45 | return (((size / alignment) + 1) * alignment) |
45 | return (((size / alignment) + 1) * alignment) |
46 | 46 | ||
47 | def subtree_size(root, cluster_size, dirent_size): |
47 | def subtree_size(root, cluster_size, dirent_size): |
48 | "Recursive directory walk and calculate size" |
48 | "Recursive directory walk and calculate size" |
49 | 49 | ||
50 | size = 0 |
50 | size = 0 |
51 | files = 0 |
51 | files = 2 |
52 | 52 | ||
53 | for name in os.listdir(root): |
53 | for name in os.listdir(root): |
54 | canon = os.path.join(root, name) |
54 | canon = os.path.join(root, name) |
55 | 55 | ||
56 | if (os.path.isfile(canon)): |
56 | if (os.path.isfile(canon)): |
57 | size += align_up(os.path.getsize(canon), cluster_size) |
57 | size += align_up(os.path.getsize(canon), cluster_size) |
58 | files += 1 |
58 | files += 1 |
59 | 59 | ||
60 | if (os.path.isdir(canon)): |
60 | if (os.path.isdir(canon)): |
61 | size += subtree_size(canon, cluster_size, dirent_size) |
61 | size += subtree_size(canon, cluster_size, dirent_size) |
62 | files += 1 |
62 | files += 1 |
63 | 63 | ||
64 | return size + align_up(files * dirent_size, cluster_size) |
64 | return size + align_up(files * dirent_size, cluster_size) |
65 | 65 | ||
66 | def root_entries(root): |
66 | def root_entries(root): |
67 | "Return number of root directory entries" |
67 | "Return number of root directory entries" |
68 | 68 | ||
69 | return len(os.listdir(root)) |
69 | return len(os.listdir(root)) |
70 | 70 | ||
71 | def write_file(path, outf, cluster_size, data_start, fat): |
71 | def write_file(path, outf, cluster_size, data_start, fat, reserved_clusters): |
72 | "Store the contents of a file" |
72 | "Store the contents of a file" |
73 | 73 | ||
74 | size = os.path.getsize(path) |
74 | size = os.path.getsize(path) |
75 | prev = -1 |
75 | prev = -1 |
76 | first = -1 |
76 | first = 0 |
77 | 77 | ||
78 | inf = file(path, "r") |
78 | inf = file(path, "r") |
79 | rd = 0; |
79 | rd = 0; |
80 | while (rd < size): |
80 | while (rd < size): |
81 | data = inf.read(cluster_size); |
- | |
82 | - | ||
83 | empty_cluster = fat.index(0) |
81 | empty_cluster = fat.index(0) |
84 | - | ||
85 | fat[empty_cluster] = 0xffff |
82 | fat[empty_cluster] = 0xffff |
- | 83 | ||
86 | if (prev != -1): |
84 | if (prev != -1): |
87 | fat[prev] = empty_cluster |
85 | fat[prev] = empty_cluster |
88 | else: |
86 | else: |
89 | first = empty_cluster |
87 | first = empty_cluster |
90 | 88 | ||
91 | prev = empty_cluster |
89 | prev = empty_cluster |
92 | 90 | ||
- | 91 | data = inf.read(cluster_size); |
|
93 | outf.seek(data_start + empty_cluster * cluster_size) |
92 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
94 | outf.write(data) |
93 | outf.write(data) |
95 | rd += len(data) |
94 | rd += len(data) |
96 | inf.close() |
95 | inf.close() |
97 | 96 | ||
98 | return first, size |
97 | return first, size |
99 | 98 | ||
- | 99 | def write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster): |
|
- | 100 | "Store the contents of a directory" |
|
- | 101 | ||
- | 102 | length = len(directory) |
|
- | 103 | size = length * dirent_size |
|
- | 104 | prev = -1 |
|
- | 105 | first = 0 |
|
- | 106 | ||
- | 107 | i = 0 |
|
- | 108 | rd = 0; |
|
- | 109 | while (rd < size): |
|
- | 110 | if (prev != -1): |
|
- | 111 | empty_cluster = fat.index(0) |
|
- | 112 | fat[empty_cluster] = 0xffff |
|
- | 113 | fat[prev] = empty_cluster |
|
- | 114 | else: |
|
- | 115 | first = empty_cluster |
|
- | 116 | ||
- | 117 | prev = empty_cluster |
|
- | 118 | ||
- | 119 | data = '' |
|
- | 120 | data_len = 0 |
|
- | 121 | while ((i < length) and (data_len < cluster_size)): |
|
- | 122 | if (i == 0): |
|
- | 123 | directory[i].cluster = empty_cluster |
|
- | 124 | ||
- | 125 | data += directory[i].pack() |
|
- | 126 | data_len += dirent_size |
|
- | 127 | i += 1 |
|
- | 128 | ||
- | 129 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
|
- | 130 | outf.write(data) |
|
- | 131 | rd += len(data) |
|
- | 132 | ||
- | 133 | return first, size |
|
- | 134 | ||
100 | DIR_ENTRY = """little: |
135 | DIR_ENTRY = """little: |
101 | char name[8] /* file name */ |
136 | char name[8] /* file name */ |
102 | char ext[3] /* file extension */ |
137 | char ext[3] /* file extension */ |
103 | uint8_t attr /* file attributes */ |
138 | uint8_t attr /* file attributes */ |
104 | padding[1] /* reserved for NT */ |
139 | padding[1] /* reserved for NT */ |
105 | uint8_t ctime_fine /* create time (fine resolution) */ |
140 | uint8_t ctime_fine /* create time (fine resolution) */ |
106 | uint16_t ctime /* create time */ |
141 | uint16_t ctime /* create time */ |
107 | uint16_t cdate /* create date */ |
142 | uint16_t cdate /* create date */ |
108 | uint16_t adate /* access date */ |
143 | uint16_t adate /* access date */ |
109 | padding[2] /* EA-index */ |
144 | padding[2] /* EA-index */ |
110 | uint16_t mtime /* modification time */ |
145 | uint16_t mtime /* modification time */ |
111 | uint16_t mdate /* modification date */ |
146 | uint16_t mdate /* modification date */ |
112 | uint16_t cluster /* first cluster */ |
147 | uint16_t cluster /* first cluster */ |
113 | uint32_t size /* file size */ |
148 | uint32_t size /* file size */ |
114 | """ |
149 | """ |
115 | 150 | ||
- | 151 | DOT_DIR_ENTRY = """little: |
|
- | 152 | uint8_t signature /* 0x2e signature */ |
|
- | 153 | char name[7] /* empty */ |
|
- | 154 | char ext[3] /* empty */ |
|
- | 155 | uint8_t attr /* file attributes */ |
|
- | 156 | padding[1] /* reserved for NT */ |
|
- | 157 | uint8_t ctime_fine /* create time (fine resolution) */ |
|
- | 158 | uint16_t ctime /* create time */ |
|
- | 159 | uint16_t cdate /* create date */ |
|
- | 160 | uint16_t adate /* access date */ |
|
- | 161 | padding[2] /* EA-index */ |
|
- | 162 | uint16_t mtime /* modification time */ |
|
- | 163 | uint16_t mdate /* modification date */ |
|
- | 164 | uint16_t cluster /* first cluster */ |
|
- | 165 | uint32_t size /* file size */ |
|
- | 166 | """ |
|
- | 167 | ||
- | 168 | DOTDOT_DIR_ENTRY = """little: |
|
- | 169 | uint8_t signature[2] /* 0x2e signature */ |
|
- | 170 | char name[6] /* empty */ |
|
- | 171 | char ext[3] /* empty */ |
|
- | 172 | uint8_t attr /* file attributes */ |
|
- | 173 | padding[1] /* reserved for NT */ |
|
- | 174 | uint8_t ctime_fine /* create time (fine resolution) */ |
|
- | 175 | uint16_t ctime /* create time */ |
|
- | 176 | uint16_t cdate /* create date */ |
|
- | 177 | uint16_t adate /* access date */ |
|
- | 178 | padding[2] /* EA-index */ |
|
- | 179 | uint16_t mtime /* modification time */ |
|
- | 180 | uint16_t mdate /* modification date */ |
|
- | 181 | uint16_t cluster /* first cluster */ |
|
- | 182 | uint32_t size /* file size */ |
|
- | 183 | """ |
|
- | 184 | ||
116 | def mangle_fname(name): |
185 | def mangle_fname(name): |
117 | # FIXME: filter illegal characters |
186 | # FIXME: filter illegal characters |
118 | fname = (name.split('.')[0] + ' ').upper()[0:8] |
187 | parts = name.split('.') |
- | 188 | ||
- | 189 | if (len(parts) > 0): |
|
- | 190 | fname = parts[0] |
|
- | 191 | else: |
|
119 | return fname |
192 | fname = '' |
- | 193 | ||
- | 194 | return (fname + ' ').upper()[0:8] |
|
120 | 195 | ||
121 | def mangle_ext(name): |
196 | def mangle_ext(name): |
122 | # FIXME: filter illegal characters |
197 | # FIXME: filter illegal characters |
123 | ext = (name.split('.')[1] + ' ').upper()[0:3] |
198 | parts = name.split('.') |
- | 199 | ||
- | 200 | if (len(parts) > 1): |
|
- | 201 | ext = parts[1] |
|
- | 202 | else: |
|
124 | return ext |
203 | ext = '' |
- | 204 | ||
- | 205 | return (ext + ' ').upper()[0:3] |
|
125 | 206 | ||
126 | def create_dirent(name, directory, cluster, size): |
207 | def create_dirent(name, directory, cluster, size): |
127 | dir_entry = xstruct.create(DIR_ENTRY) |
208 | dir_entry = xstruct.create(DIR_ENTRY) |
128 | 209 | ||
129 | dir_entry.name = mangle_fname(name) |
210 | dir_entry.name = mangle_fname(name) |
130 | dir_entry.ext = mangle_ext(name) |
211 | dir_entry.ext = mangle_ext(name) |
131 | 212 | ||
132 | if (directory): |
213 | if (directory): |
133 | dir_entry.attr = 0x30 |
214 | dir_entry.attr = 0x30 |
134 | else: |
215 | else: |
135 | dir_entry.attr = 0x20 |
216 | dir_entry.attr = 0x20 |
136 | 217 | ||
137 | dir_entry.ctime_fine = 0 # FIXME |
218 | dir_entry.ctime_fine = 0 # FIXME |
138 | dir_entry.ctime = 0 # FIXME |
219 | dir_entry.ctime = 0 # FIXME |
139 | dir_entry.cdate = 0 # FIXME |
220 | dir_entry.cdate = 0 # FIXME |
140 | dir_entry.adate = 0 # FIXME |
221 | dir_entry.adate = 0 # FIXME |
141 | dir_entry.mtime = 0 # FIXME |
222 | dir_entry.mtime = 0 # FIXME |
142 | dir_entry.mdate = 0 # FIXME |
223 | dir_entry.mdate = 0 # FIXME |
143 | dir_entry.cluster = cluster |
224 | dir_entry.cluster = cluster |
- | 225 | ||
- | 226 | if (directory): |
|
- | 227 | dir_entry.size = 0 |
|
- | 228 | else: |
|
144 | dir_entry.size = size |
229 | dir_entry.size = size |
- | 230 | ||
- | 231 | return dir_entry |
|
- | 232 | ||
- | 233 | def create_dot_dirent(empty_cluster): |
|
- | 234 | dir_entry = xstruct.create(DOT_DIR_ENTRY) |
|
- | 235 | ||
- | 236 | dir_entry.signature = 0x2e |
|
- | 237 | dir_entry.name = ' ' |
|
- | 238 | dir_entry.ext = ' ' |
|
- | 239 | dir_entry.attr = 0x10 |
|
- | 240 | ||
- | 241 | dir_entry.ctime_fine = 0 # FIXME |
|
- | 242 | dir_entry.ctime = 0 # FIXME |
|
- | 243 | dir_entry.cdate = 0 # FIXME |
|
- | 244 | dir_entry.adate = 0 # FIXME |
|
- | 245 | dir_entry.mtime = 0 # FIXME |
|
- | 246 | dir_entry.mdate = 0 # FIXME |
|
- | 247 | dir_entry.cluster = empty_cluster |
|
- | 248 | dir_entry.size = 0 |
|
- | 249 | ||
- | 250 | return dir_entry |
|
- | 251 | ||
- | 252 | def create_dotdot_dirent(parent_cluster): |
|
- | 253 | dir_entry = xstruct.create(DOTDOT_DIR_ENTRY) |
|
- | 254 | ||
- | 255 | dir_entry.signature = [0x2e, 0x2e] |
|
- | 256 | dir_entry.name = ' ' |
|
- | 257 | dir_entry.ext = ' ' |
|
- | 258 | dir_entry.attr = 0x10 |
|
- | 259 | ||
- | 260 | dir_entry.ctime_fine = 0 # FIXME |
|
- | 261 | dir_entry.ctime = 0 # FIXME |
|
- | 262 | dir_entry.cdate = 0 # FIXME |
|
- | 263 | dir_entry.adate = 0 # FIXME |
|
- | 264 | dir_entry.mtime = 0 # FIXME |
|
- | 265 | dir_entry.mdate = 0 # FIXME |
|
- | 266 | dir_entry.cluster = parent_cluster |
|
- | 267 | dir_entry.size = 0 |
|
145 | 268 | ||
146 | return dir_entry |
269 | return dir_entry |
147 | 270 | ||
148 | def recursion(head, root, outf, cluster_size, root_start, data_start, fat): |
271 | def recursion(head, root, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, parent_cluster): |
149 | "Recursive directory walk" |
272 | "Recursive directory walk" |
150 | 273 | ||
151 | directory = [] |
274 | directory = [] |
- | 275 | ||
- | 276 | if (not head): |
|
- | 277 | # Directory cluster preallocation |
|
- | 278 | empty_cluster = fat.index(0) |
|
- | 279 | fat[empty_cluster] = 0xffff |
|
- | 280 | ||
- | 281 | directory.append(create_dot_dirent(empty_cluster)) |
|
- | 282 | directory.append(create_dotdot_dirent(parent_cluster)) |
|
- | 283 | else: |
|
- | 284 | empty_cluster = 0 |
|
- | 285 | ||
152 | for name in os.listdir(root): |
286 | for name in os.listdir(root): |
153 | canon = os.path.join(root, name) |
287 | canon = os.path.join(root, name) |
154 | 288 | ||
155 | if (os.path.isfile(canon)): |
289 | if (os.path.isfile(canon)): |
156 | rv = write_file(canon, outf, cluster_size, data_start, fat) |
290 | rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters) |
157 | directory.append(create_dirent(name, False, rv[0], rv[1])) |
291 | directory.append(create_dirent(name, False, rv[0], rv[1])) |
- | 292 | ||
- | 293 | if (os.path.isdir(canon)): |
|
- | 294 | rv = recursion(False, canon, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
|
- | 295 | directory.append(create_dirent(name, True, rv[0], rv[1])) |
|
158 | 296 | ||
159 | if (head): |
297 | if (head): |
160 | outf.seek(root_start) |
298 | outf.seek(root_start) |
161 | for dir_entry in directory: |
299 | for dir_entry in directory: |
162 | outf.write(dir_entry.pack()) |
300 | outf.write(dir_entry.pack()) |
- | 301 | else: |
|
- | 302 | return write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
|
163 | 303 | ||
164 | BOOT_SECTOR = """little: |
304 | BOOT_SECTOR = """little: |
165 | uint8_t jmp[3] /* jump instruction */ |
305 | uint8_t jmp[3] /* jump instruction */ |
166 | char oem[8] /* OEM string */ |
306 | char oem[8] /* OEM string */ |
167 | uint16_t sector /* bytes per sector */ |
307 | uint16_t sector /* bytes per sector */ |
168 | uint8_t cluster /* sectors per cluster */ |
308 | uint8_t cluster /* sectors per cluster */ |
169 | uint16_t reserved /* reserved sectors */ |
309 | uint16_t reserved /* reserved sectors */ |
170 | uint8_t fats /* number of FATs */ |
310 | uint8_t fats /* number of FATs */ |
171 | uint16_t rootdir /* root directory entries */ |
311 | uint16_t rootdir /* root directory entries */ |
172 | uint16_t sectors /* total number of sectors */ |
312 | uint16_t sectors /* total number of sectors */ |
173 | uint8_t descriptor /* media descriptor */ |
313 | uint8_t descriptor /* media descriptor */ |
174 | uint16_t fat_sectors /* sectors per single FAT */ |
314 | uint16_t fat_sectors /* sectors per single FAT */ |
175 | uint16_t track_sectors /* sectors per track */ |
315 | uint16_t track_sectors /* sectors per track */ |
176 | uint16_t heads /* number of heads */ |
316 | uint16_t heads /* number of heads */ |
177 | uint32_t hidden /* hidden sectors */ |
317 | uint32_t hidden /* hidden sectors */ |
178 | uint32_t sectors_big /* total number of sectors (if sectors == 0) */ |
318 | uint32_t sectors_big /* total number of sectors (if sectors == 0) */ |
179 | |
319 | |
180 | /* Extended BIOS Parameter Block */ |
320 | /* Extended BIOS Parameter Block */ |
181 | uint8_t drive /* physical drive number */ |
321 | uint8_t drive /* physical drive number */ |
182 | padding[1] /* reserved (current head) */ |
322 | padding[1] /* reserved (current head) */ |
183 | uint8_t extboot_signature /* extended boot signature */ |
323 | uint8_t extboot_signature /* extended boot signature */ |
184 | uint32_t serial /* serial number */ |
324 | uint32_t serial /* serial number */ |
185 | char label[11] /* volume label */ |
325 | char label[11] /* volume label */ |
186 | char fstype[8] /* filesystem type */ |
326 | char fstype[8] /* filesystem type */ |
187 | padding[448] /* boot code */ |
327 | padding[448] /* boot code */ |
188 | uint8_t boot_signature[2] /* boot signature */ |
328 | uint8_t boot_signature[2] /* boot signature */ |
189 | """ |
329 | """ |
190 | 330 | ||
191 | EMPTY_SECTOR = """little: |
331 | EMPTY_SECTOR = """little: |
192 | padding[512] /* empty sector data */ |
332 | padding[512] /* empty sector data */ |
193 | """ |
333 | """ |
194 | 334 | ||
195 | FAT_ENTRY = """little: |
335 | FAT_ENTRY = """little: |
196 | uint16_t next /* FAT16 entry */ |
336 | uint16_t next /* FAT16 entry */ |
197 | """ |
337 | """ |
198 | 338 | ||
199 | def usage(prname): |
339 | def usage(prname): |
200 | "Print usage syntax" |
340 | "Print usage syntax" |
201 | print prname + " <PATH> <IMAGE>" |
341 | print prname + " <PATH> <IMAGE>" |
202 | 342 | ||
203 | def main(): |
343 | def main(): |
204 | if (len(sys.argv) < 3): |
344 | if (len(sys.argv) < 3): |
205 | usage(sys.argv[0]) |
345 | usage(sys.argv[0]) |
206 | return |
346 | return |
207 | 347 | ||
208 | path = os.path.abspath(sys.argv[1]) |
348 | path = os.path.abspath(sys.argv[1]) |
209 | if (not os.path.isdir(path)): |
349 | if (not os.path.isdir(path)): |
210 | print "<PATH> must be a directory" |
350 | print "<PATH> must be a directory" |
211 | return |
351 | return |
212 | 352 | ||
213 | fat16_clusters = 4096 |
353 | fat16_clusters = 4096 |
- | 354 | min_cluster_size = 1024 |
|
214 | 355 | ||
215 | sector_size = 512 |
356 | sector_size = 512 |
216 | cluster_size = 4096 |
357 | cluster_size = 4096 |
217 | dirent_size = 32 |
358 | dirent_size = 32 |
218 | fatent_size = 2 |
359 | fatent_size = 2 |
219 | fat_count = 2 |
360 | fat_count = 2 |
220 | reserved_clusters = 2 |
361 | reserved_clusters = 2 |
221 | 362 | ||
222 | # Make sure the filesystem is large enought for FAT16 |
363 | # Make sure the filesystem is large enought for FAT16 |
223 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
364 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
224 | while (size / cluster_size < fat16_clusters): |
365 | while (size / cluster_size < fat16_clusters): |
225 | if (cluster_size > sector_size): |
366 | if (cluster_size > min_cluster_size): |
226 | cluster_size /= 2 |
367 | cluster_size /= 2 |
227 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
368 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
228 | else: |
369 | else: |
229 | size = fat16_clusters * cluster_size + reserved_clusters * cluster_size |
370 | size = fat16_clusters * cluster_size + reserved_clusters * cluster_size |
230 | 371 | ||
231 | root_size = align_up(root_entries(path) * dirent_size, cluster_size) |
372 | root_size = align_up(root_entries(path) * dirent_size, cluster_size) |
232 | 373 | ||
233 | fat_size = align_up(align_up(size, cluster_size) / cluster_size * fatent_size, sector_size) |
374 | fat_size = align_up(align_up(size, cluster_size) / cluster_size * fatent_size, sector_size) |
234 | 375 | ||
235 | sectors = (cluster_size + fat_count * fat_size + root_size + size) / sector_size |
376 | sectors = (cluster_size + fat_count * fat_size + root_size + size) / sector_size |
236 | root_start = cluster_size + fat_count * fat_size |
377 | root_start = cluster_size + fat_count * fat_size |
237 | data_start = root_start + root_size |
378 | data_start = root_start + root_size |
238 | 379 | ||
239 | outf = file(sys.argv[2], "w") |
380 | outf = file(sys.argv[2], "w") |
240 | 381 | ||
241 | boot_sector = xstruct.create(BOOT_SECTOR) |
382 | boot_sector = xstruct.create(BOOT_SECTOR) |
242 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
383 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
243 | boot_sector.oem = "MSDOS5.0" |
384 | boot_sector.oem = "MSDOS5.0" |
244 | boot_sector.sector = sector_size |
385 | boot_sector.sector = sector_size |
245 | boot_sector.cluster = cluster_size / sector_size |
386 | boot_sector.cluster = cluster_size / sector_size |
246 | boot_sector.reserved = cluster_size / sector_size |
387 | boot_sector.reserved = cluster_size / sector_size |
247 | boot_sector.fats = fat_count |
388 | boot_sector.fats = fat_count |
248 | boot_sector.rootdir = root_size / dirent_size |
389 | boot_sector.rootdir = root_size / dirent_size |
249 | boot_sector.sectors = (sectors if (sectors <= 65535) else 0) |
390 | boot_sector.sectors = (sectors if (sectors <= 65535) else 0) |
250 | boot_sector.descriptor = 0xF8 |
391 | boot_sector.descriptor = 0xF8 |
251 | boot_sector.fat_sectors = fat_size / sector_size |
392 | boot_sector.fat_sectors = fat_size / sector_size |
252 | boot_sector.track_sectors = 63 |
393 | boot_sector.track_sectors = 63 |
253 | boot_sector.heads = 6 |
394 | boot_sector.heads = 6 |
254 | boot_sector.hidden = 0 |
395 | boot_sector.hidden = 0 |
255 | boot_sector.sectors_big = (sectors if (sectors > 65535) else 0) |
396 | boot_sector.sectors_big = (sectors if (sectors > 65535) else 0) |
256 | 397 | ||
257 | boot_sector.drive = 0x80 |
398 | boot_sector.drive = 0x80 |
258 | boot_sector.extboot_signature = 0x29 |
399 | boot_sector.extboot_signature = 0x29 |
259 | boot_sector.serial = random.randint(0, 0xFFFFFFFF) |
400 | boot_sector.serial = random.randint(0, 0xFFFFFFFF) |
260 | boot_sector.label = "HELENOS" |
401 | boot_sector.label = "HELENOS" |
261 | boot_sector.fstype = "FAT16 " |
402 | boot_sector.fstype = "FAT16 " |
262 | boot_sector.boot_signature = [0x55, 0xAA] |
403 | boot_sector.boot_signature = [0x55, 0xAA] |
263 | 404 | ||
264 | outf.write(boot_sector.pack()) |
405 | outf.write(boot_sector.pack()) |
265 | 406 | ||
266 | empty_sector = xstruct.create(EMPTY_SECTOR) |
407 | empty_sector = xstruct.create(EMPTY_SECTOR) |
267 | 408 | ||
268 | # Reserved sectors |
409 | # Reserved sectors |
269 | for i in range(1, cluster_size / sector_size): |
410 | for i in range(1, cluster_size / sector_size): |
270 | outf.write(empty_sector.pack()) |
411 | outf.write(empty_sector.pack()) |
271 | 412 | ||
272 | # FAT tables |
413 | # FAT tables |
273 | for i in range(0, fat_count): |
414 | for i in range(0, fat_count): |
274 | for j in range(0, boot_sector.fat_sectors): |
415 | for j in range(0, fat_size / sector_size): |
275 | outf.write(empty_sector.pack()) |
416 | outf.write(empty_sector.pack()) |
276 | 417 | ||
277 | # Root directory |
418 | # Root directory |
278 | for i in range(0, root_size / sector_size): |
419 | for i in range(0, root_size / sector_size): |
279 | outf.write(empty_sector.pack()) |
420 | outf.write(empty_sector.pack()) |
280 | 421 | ||
281 | # Data |
422 | # Data |
282 | for i in range(0, size / sector_size): |
423 | for i in range(0, size / sector_size): |
283 | outf.write(empty_sector.pack()) |
424 | outf.write(empty_sector.pack()) |
284 | 425 | ||
285 | fat = array.array('L', [0] * (fat_size / fatent_size)) |
426 | fat = array.array('L', [0] * (fat_size / fatent_size)) |
286 | fat[0] = 0xfff8 |
427 | fat[0] = 0xfff8 |
287 | fat[1] = 0xffff |
428 | fat[1] = 0xffff |
288 | 429 | ||
289 | recursion(True, path, outf, cluster_size, root_start, data_start, fat) |
430 | recursion(True, path, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, 0) |
290 | 431 | ||
291 | # Store FAT |
432 | # Store FAT |
292 | fat_entry = xstruct.create(FAT_ENTRY) |
433 | fat_entry = xstruct.create(FAT_ENTRY) |
293 | for i in range(0, fat_count): |
434 | for i in range(0, fat_count): |
294 | outf.seek(cluster_size + i * fat_size) |
435 | outf.seek(cluster_size + i * fat_size) |
295 | for j in range(0, fat_size / fatent_size): |
436 | for j in range(0, fat_size / fatent_size): |
296 | fat_entry.next = fat[j] |
437 | fat_entry.next = fat[j] |
297 | outf.write(fat_entry.pack()) |
438 | outf.write(fat_entry.pack()) |
298 | 439 | ||
299 | outf.close() |
440 | outf.close() |
300 | 441 | ||
301 | if __name__ == '__main__': |
442 | if __name__ == '__main__': |
302 | main() |
443 | main() |
303 | 444 |