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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 | exclude_names = set(['.svn']) |
|
- | 40 | ||
39 | def align_up(size, alignment): |
41 | def align_up(size, alignment): |
40 | "Return size aligned up to alignment" |
42 | "Return size aligned up to alignment" |
41 | 43 | ||
42 | if (size % alignment == 0): |
44 | if (size % alignment == 0): |
43 | return size |
45 | return size |
44 | 46 | ||
45 | return (((size / alignment) + 1) * alignment) |
47 | return (((size / alignment) + 1) * alignment) |
46 | 48 | ||
47 | def subtree_size(root, cluster_size, dirent_size): |
49 | def subtree_size(root, cluster_size, dirent_size): |
48 | "Recursive directory walk and calculate size" |
50 | "Recursive directory walk and calculate size" |
49 | 51 | ||
50 | size = 0 |
52 | size = 0 |
51 | files = 2 |
53 | files = 2 |
52 | 54 | ||
53 | for name in os.listdir(root): |
55 | for name in os.listdir(root): |
54 | canon = os.path.join(root, name) |
56 | canon = os.path.join(root, name) |
55 | 57 | ||
56 | if (os.path.isfile(canon)): |
58 | if (os.path.isfile(canon) and (not name in exclude_names)): |
57 | size += align_up(os.path.getsize(canon), cluster_size) |
59 | size += align_up(os.path.getsize(canon), cluster_size) |
58 | files += 1 |
60 | files += 1 |
59 | 61 | ||
60 | if (os.path.isdir(canon)): |
62 | if (os.path.isdir(canon) and (not name in exclude_names)): |
61 | size += subtree_size(canon, cluster_size, dirent_size) |
63 | size += subtree_size(canon, cluster_size, dirent_size) |
62 | files += 1 |
64 | files += 1 |
63 | 65 | ||
64 | return size + align_up(files * dirent_size, cluster_size) |
66 | return size + align_up(files * dirent_size, cluster_size) |
65 | 67 | ||
66 | def root_entries(root): |
68 | def root_entries(root): |
67 | "Return number of root directory entries" |
69 | "Return number of root directory entries" |
68 | 70 | ||
69 | return len(os.listdir(root)) |
71 | return len(os.listdir(root)) |
70 | 72 | ||
71 | def write_file(path, outf, cluster_size, data_start, fat, reserved_clusters): |
73 | def write_file(path, outf, cluster_size, data_start, fat, reserved_clusters): |
72 | "Store the contents of a file" |
74 | "Store the contents of a file" |
73 | 75 | ||
74 | size = os.path.getsize(path) |
76 | size = os.path.getsize(path) |
75 | prev = -1 |
77 | prev = -1 |
76 | first = 0 |
78 | first = 0 |
77 | 79 | ||
78 | inf = file(path, "r") |
80 | inf = file(path, "r") |
79 | rd = 0; |
81 | rd = 0; |
80 | while (rd < size): |
82 | while (rd < size): |
81 | empty_cluster = fat.index(0) |
83 | empty_cluster = fat.index(0) |
82 | fat[empty_cluster] = 0xffff |
84 | fat[empty_cluster] = 0xffff |
83 | 85 | ||
84 | if (prev != -1): |
86 | if (prev != -1): |
85 | fat[prev] = empty_cluster |
87 | fat[prev] = empty_cluster |
86 | else: |
88 | else: |
87 | first = empty_cluster |
89 | first = empty_cluster |
88 | 90 | ||
89 | prev = empty_cluster |
91 | prev = empty_cluster |
90 | 92 | ||
91 | data = inf.read(cluster_size); |
93 | data = inf.read(cluster_size); |
92 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
94 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
93 | outf.write(data) |
95 | outf.write(data) |
94 | rd += len(data) |
96 | rd += len(data) |
95 | inf.close() |
97 | inf.close() |
96 | 98 | ||
97 | return first, size |
99 | return first, size |
98 | 100 | ||
99 | def write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster): |
101 | def write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster): |
100 | "Store the contents of a directory" |
102 | "Store the contents of a directory" |
101 | 103 | ||
102 | length = len(directory) |
104 | length = len(directory) |
103 | size = length * dirent_size |
105 | size = length * dirent_size |
104 | prev = -1 |
106 | prev = -1 |
105 | first = 0 |
107 | first = 0 |
106 | 108 | ||
107 | i = 0 |
109 | i = 0 |
108 | rd = 0; |
110 | rd = 0; |
109 | while (rd < size): |
111 | while (rd < size): |
110 | if (prev != -1): |
112 | if (prev != -1): |
111 | empty_cluster = fat.index(0) |
113 | empty_cluster = fat.index(0) |
112 | fat[empty_cluster] = 0xffff |
114 | fat[empty_cluster] = 0xffff |
113 | fat[prev] = empty_cluster |
115 | fat[prev] = empty_cluster |
114 | else: |
116 | else: |
115 | first = empty_cluster |
117 | first = empty_cluster |
116 | 118 | ||
117 | prev = empty_cluster |
119 | prev = empty_cluster |
118 | 120 | ||
119 | data = '' |
121 | data = '' |
120 | data_len = 0 |
122 | data_len = 0 |
121 | while ((i < length) and (data_len < cluster_size)): |
123 | while ((i < length) and (data_len < cluster_size)): |
122 | if (i == 0): |
124 | if (i == 0): |
123 | directory[i].cluster = empty_cluster |
125 | directory[i].cluster = empty_cluster |
124 | 126 | ||
125 | data += directory[i].pack() |
127 | data += directory[i].pack() |
126 | data_len += dirent_size |
128 | data_len += dirent_size |
127 | i += 1 |
129 | i += 1 |
128 | 130 | ||
129 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
131 | outf.seek(data_start + (empty_cluster - reserved_clusters) * cluster_size) |
130 | outf.write(data) |
132 | outf.write(data) |
131 | rd += len(data) |
133 | rd += len(data) |
132 | 134 | ||
133 | return first, size |
135 | return first, size |
134 | 136 | ||
135 | DIR_ENTRY = """little: |
137 | DIR_ENTRY = """little: |
136 | char name[8] /* file name */ |
138 | char name[8] /* file name */ |
137 | char ext[3] /* file extension */ |
139 | char ext[3] /* file extension */ |
138 | uint8_t attr /* file attributes */ |
140 | uint8_t attr /* file attributes */ |
139 | padding[1] /* reserved for NT */ |
141 | padding[1] /* reserved for NT */ |
140 | uint8_t ctime_fine /* create time (fine resolution) */ |
142 | uint8_t ctime_fine /* create time (fine resolution) */ |
141 | uint16_t ctime /* create time */ |
143 | uint16_t ctime /* create time */ |
142 | uint16_t cdate /* create date */ |
144 | uint16_t cdate /* create date */ |
143 | uint16_t adate /* access date */ |
145 | uint16_t adate /* access date */ |
144 | padding[2] /* EA-index */ |
146 | padding[2] /* EA-index */ |
145 | uint16_t mtime /* modification time */ |
147 | uint16_t mtime /* modification time */ |
146 | uint16_t mdate /* modification date */ |
148 | uint16_t mdate /* modification date */ |
147 | uint16_t cluster /* first cluster */ |
149 | uint16_t cluster /* first cluster */ |
148 | uint32_t size /* file size */ |
150 | uint32_t size /* file size */ |
149 | """ |
151 | """ |
150 | 152 | ||
151 | DOT_DIR_ENTRY = """little: |
153 | DOT_DIR_ENTRY = """little: |
152 | uint8_t signature /* 0x2e signature */ |
154 | uint8_t signature /* 0x2e signature */ |
153 | char name[7] /* empty */ |
155 | char name[7] /* empty */ |
154 | char ext[3] /* empty */ |
156 | char ext[3] /* empty */ |
155 | uint8_t attr /* file attributes */ |
157 | uint8_t attr /* file attributes */ |
156 | padding[1] /* reserved for NT */ |
158 | padding[1] /* reserved for NT */ |
157 | uint8_t ctime_fine /* create time (fine resolution) */ |
159 | uint8_t ctime_fine /* create time (fine resolution) */ |
158 | uint16_t ctime /* create time */ |
160 | uint16_t ctime /* create time */ |
159 | uint16_t cdate /* create date */ |
161 | uint16_t cdate /* create date */ |
160 | uint16_t adate /* access date */ |
162 | uint16_t adate /* access date */ |
161 | padding[2] /* EA-index */ |
163 | padding[2] /* EA-index */ |
162 | uint16_t mtime /* modification time */ |
164 | uint16_t mtime /* modification time */ |
163 | uint16_t mdate /* modification date */ |
165 | uint16_t mdate /* modification date */ |
164 | uint16_t cluster /* first cluster */ |
166 | uint16_t cluster /* first cluster */ |
165 | uint32_t size /* file size */ |
167 | uint32_t size /* file size */ |
166 | """ |
168 | """ |
167 | 169 | ||
168 | DOTDOT_DIR_ENTRY = """little: |
170 | DOTDOT_DIR_ENTRY = """little: |
169 | uint8_t signature[2] /* 0x2e signature */ |
171 | uint8_t signature[2] /* 0x2e signature */ |
170 | char name[6] /* empty */ |
172 | char name[6] /* empty */ |
171 | char ext[3] /* empty */ |
173 | char ext[3] /* empty */ |
172 | uint8_t attr /* file attributes */ |
174 | uint8_t attr /* file attributes */ |
173 | padding[1] /* reserved for NT */ |
175 | padding[1] /* reserved for NT */ |
174 | uint8_t ctime_fine /* create time (fine resolution) */ |
176 | uint8_t ctime_fine /* create time (fine resolution) */ |
175 | uint16_t ctime /* create time */ |
177 | uint16_t ctime /* create time */ |
176 | uint16_t cdate /* create date */ |
178 | uint16_t cdate /* create date */ |
177 | uint16_t adate /* access date */ |
179 | uint16_t adate /* access date */ |
178 | padding[2] /* EA-index */ |
180 | padding[2] /* EA-index */ |
179 | uint16_t mtime /* modification time */ |
181 | uint16_t mtime /* modification time */ |
180 | uint16_t mdate /* modification date */ |
182 | uint16_t mdate /* modification date */ |
181 | uint16_t cluster /* first cluster */ |
183 | uint16_t cluster /* first cluster */ |
182 | uint32_t size /* file size */ |
184 | uint32_t size /* file size */ |
183 | """ |
185 | """ |
184 | 186 | ||
185 | def mangle_fname(name): |
187 | def mangle_fname(name): |
186 | # FIXME: filter illegal characters |
188 | # FIXME: filter illegal characters |
187 | parts = name.split('.') |
189 | parts = name.split('.') |
188 | 190 | ||
189 | if (len(parts) > 0): |
191 | if (len(parts) > 0): |
190 | fname = parts[0] |
192 | fname = parts[0] |
191 | else: |
193 | else: |
192 | fname = '' |
194 | fname = '' |
193 | 195 | ||
194 | return (fname + ' ').upper()[0:8] |
196 | return (fname + ' ').upper()[0:8] |
195 | 197 | ||
196 | def mangle_ext(name): |
198 | def mangle_ext(name): |
197 | # FIXME: filter illegal characters |
199 | # FIXME: filter illegal characters |
198 | parts = name.split('.') |
200 | parts = name.split('.') |
199 | 201 | ||
200 | if (len(parts) > 1): |
202 | if (len(parts) > 1): |
201 | ext = parts[1] |
203 | ext = parts[1] |
202 | else: |
204 | else: |
203 | ext = '' |
205 | ext = '' |
204 | 206 | ||
205 | return (ext + ' ').upper()[0:3] |
207 | return (ext + ' ').upper()[0:3] |
206 | 208 | ||
207 | def create_dirent(name, directory, cluster, size): |
209 | def create_dirent(name, directory, cluster, size): |
208 | dir_entry = xstruct.create(DIR_ENTRY) |
210 | dir_entry = xstruct.create(DIR_ENTRY) |
209 | 211 | ||
210 | dir_entry.name = mangle_fname(name) |
212 | dir_entry.name = mangle_fname(name) |
211 | dir_entry.ext = mangle_ext(name) |
213 | dir_entry.ext = mangle_ext(name) |
212 | 214 | ||
213 | if (directory): |
215 | if (directory): |
214 | dir_entry.attr = 0x30 |
216 | dir_entry.attr = 0x30 |
215 | else: |
217 | else: |
216 | dir_entry.attr = 0x20 |
218 | dir_entry.attr = 0x20 |
217 | 219 | ||
218 | dir_entry.ctime_fine = 0 # FIXME |
220 | dir_entry.ctime_fine = 0 # FIXME |
219 | dir_entry.ctime = 0 # FIXME |
221 | dir_entry.ctime = 0 # FIXME |
220 | dir_entry.cdate = 0 # FIXME |
222 | dir_entry.cdate = 0 # FIXME |
221 | dir_entry.adate = 0 # FIXME |
223 | dir_entry.adate = 0 # FIXME |
222 | dir_entry.mtime = 0 # FIXME |
224 | dir_entry.mtime = 0 # FIXME |
223 | dir_entry.mdate = 0 # FIXME |
225 | dir_entry.mdate = 0 # FIXME |
224 | dir_entry.cluster = cluster |
226 | dir_entry.cluster = cluster |
225 | 227 | ||
226 | if (directory): |
228 | if (directory): |
227 | dir_entry.size = 0 |
229 | dir_entry.size = 0 |
228 | else: |
230 | else: |
229 | dir_entry.size = size |
231 | dir_entry.size = size |
230 | 232 | ||
231 | return dir_entry |
233 | return dir_entry |
232 | 234 | ||
233 | def create_dot_dirent(empty_cluster): |
235 | def create_dot_dirent(empty_cluster): |
234 | dir_entry = xstruct.create(DOT_DIR_ENTRY) |
236 | dir_entry = xstruct.create(DOT_DIR_ENTRY) |
235 | 237 | ||
236 | dir_entry.signature = 0x2e |
238 | dir_entry.signature = 0x2e |
237 | dir_entry.name = ' ' |
239 | dir_entry.name = ' ' |
238 | dir_entry.ext = ' ' |
240 | dir_entry.ext = ' ' |
239 | dir_entry.attr = 0x10 |
241 | dir_entry.attr = 0x10 |
240 | 242 | ||
241 | dir_entry.ctime_fine = 0 # FIXME |
243 | dir_entry.ctime_fine = 0 # FIXME |
242 | dir_entry.ctime = 0 # FIXME |
244 | dir_entry.ctime = 0 # FIXME |
243 | dir_entry.cdate = 0 # FIXME |
245 | dir_entry.cdate = 0 # FIXME |
244 | dir_entry.adate = 0 # FIXME |
246 | dir_entry.adate = 0 # FIXME |
245 | dir_entry.mtime = 0 # FIXME |
247 | dir_entry.mtime = 0 # FIXME |
246 | dir_entry.mdate = 0 # FIXME |
248 | dir_entry.mdate = 0 # FIXME |
247 | dir_entry.cluster = empty_cluster |
249 | dir_entry.cluster = empty_cluster |
248 | dir_entry.size = 0 |
250 | dir_entry.size = 0 |
249 | 251 | ||
250 | return dir_entry |
252 | return dir_entry |
251 | 253 | ||
252 | def create_dotdot_dirent(parent_cluster): |
254 | def create_dotdot_dirent(parent_cluster): |
253 | dir_entry = xstruct.create(DOTDOT_DIR_ENTRY) |
255 | dir_entry = xstruct.create(DOTDOT_DIR_ENTRY) |
254 | 256 | ||
255 | dir_entry.signature = [0x2e, 0x2e] |
257 | dir_entry.signature = [0x2e, 0x2e] |
256 | dir_entry.name = ' ' |
258 | dir_entry.name = ' ' |
257 | dir_entry.ext = ' ' |
259 | dir_entry.ext = ' ' |
258 | dir_entry.attr = 0x10 |
260 | dir_entry.attr = 0x10 |
259 | 261 | ||
260 | dir_entry.ctime_fine = 0 # FIXME |
262 | dir_entry.ctime_fine = 0 # FIXME |
261 | dir_entry.ctime = 0 # FIXME |
263 | dir_entry.ctime = 0 # FIXME |
262 | dir_entry.cdate = 0 # FIXME |
264 | dir_entry.cdate = 0 # FIXME |
263 | dir_entry.adate = 0 # FIXME |
265 | dir_entry.adate = 0 # FIXME |
264 | dir_entry.mtime = 0 # FIXME |
266 | dir_entry.mtime = 0 # FIXME |
265 | dir_entry.mdate = 0 # FIXME |
267 | dir_entry.mdate = 0 # FIXME |
266 | dir_entry.cluster = parent_cluster |
268 | dir_entry.cluster = parent_cluster |
267 | dir_entry.size = 0 |
269 | dir_entry.size = 0 |
268 | 270 | ||
269 | return dir_entry |
271 | return dir_entry |
270 | 272 | ||
271 | def recursion(head, root, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, parent_cluster): |
273 | def recursion(head, root, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, parent_cluster): |
272 | "Recursive directory walk" |
274 | "Recursive directory walk" |
273 | 275 | ||
274 | directory = [] |
276 | directory = [] |
275 | 277 | ||
276 | if (not head): |
278 | if (not head): |
277 | # Directory cluster preallocation |
279 | # Directory cluster preallocation |
278 | empty_cluster = fat.index(0) |
280 | empty_cluster = fat.index(0) |
279 | fat[empty_cluster] = 0xffff |
281 | fat[empty_cluster] = 0xffff |
280 | 282 | ||
281 | directory.append(create_dot_dirent(empty_cluster)) |
283 | directory.append(create_dot_dirent(empty_cluster)) |
282 | directory.append(create_dotdot_dirent(parent_cluster)) |
284 | directory.append(create_dotdot_dirent(parent_cluster)) |
283 | else: |
285 | else: |
284 | empty_cluster = 0 |
286 | empty_cluster = 0 |
285 | 287 | ||
286 | for name in os.listdir(root): |
288 | for name in os.listdir(root): |
287 | canon = os.path.join(root, name) |
289 | canon = os.path.join(root, name) |
288 | 290 | ||
289 | if (os.path.isfile(canon)): |
291 | if (os.path.isfile(canon) and (not name in exclude_names)): |
290 | rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters) |
292 | rv = write_file(canon, outf, cluster_size, data_start, fat, reserved_clusters) |
291 | directory.append(create_dirent(name, False, rv[0], rv[1])) |
293 | directory.append(create_dirent(name, False, rv[0], rv[1])) |
292 | 294 | ||
293 | if (os.path.isdir(canon)): |
295 | if (os.path.isdir(canon) and (not name in exclude_names)): |
294 | rv = recursion(False, canon, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
296 | 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])) |
297 | directory.append(create_dirent(name, True, rv[0], rv[1])) |
296 | 298 | ||
297 | if (head): |
299 | if (head): |
298 | outf.seek(root_start) |
300 | outf.seek(root_start) |
299 | for dir_entry in directory: |
301 | for dir_entry in directory: |
300 | outf.write(dir_entry.pack()) |
302 | outf.write(dir_entry.pack()) |
301 | else: |
303 | else: |
302 | return write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
304 | return write_directory(directory, outf, cluster_size, data_start, fat, reserved_clusters, dirent_size, empty_cluster) |
303 | 305 | ||
304 | BOOT_SECTOR = """little: |
306 | BOOT_SECTOR = """little: |
305 | uint8_t jmp[3] /* jump instruction */ |
307 | uint8_t jmp[3] /* jump instruction */ |
306 | char oem[8] /* OEM string */ |
308 | char oem[8] /* OEM string */ |
307 | uint16_t sector /* bytes per sector */ |
309 | uint16_t sector /* bytes per sector */ |
308 | uint8_t cluster /* sectors per cluster */ |
310 | uint8_t cluster /* sectors per cluster */ |
309 | uint16_t reserved /* reserved sectors */ |
311 | uint16_t reserved /* reserved sectors */ |
310 | uint8_t fats /* number of FATs */ |
312 | uint8_t fats /* number of FATs */ |
311 | uint16_t rootdir /* root directory entries */ |
313 | uint16_t rootdir /* root directory entries */ |
312 | uint16_t sectors /* total number of sectors */ |
314 | uint16_t sectors /* total number of sectors */ |
313 | uint8_t descriptor /* media descriptor */ |
315 | uint8_t descriptor /* media descriptor */ |
314 | uint16_t fat_sectors /* sectors per single FAT */ |
316 | uint16_t fat_sectors /* sectors per single FAT */ |
315 | uint16_t track_sectors /* sectors per track */ |
317 | uint16_t track_sectors /* sectors per track */ |
316 | uint16_t heads /* number of heads */ |
318 | uint16_t heads /* number of heads */ |
317 | uint32_t hidden /* hidden sectors */ |
319 | uint32_t hidden /* hidden sectors */ |
318 | uint32_t sectors_big /* total number of sectors (if sectors == 0) */ |
320 | uint32_t sectors_big /* total number of sectors (if sectors == 0) */ |
319 | |
321 | |
320 | /* Extended BIOS Parameter Block */ |
322 | /* Extended BIOS Parameter Block */ |
321 | uint8_t drive /* physical drive number */ |
323 | uint8_t drive /* physical drive number */ |
322 | padding[1] /* reserved (current head) */ |
324 | padding[1] /* reserved (current head) */ |
323 | uint8_t extboot_signature /* extended boot signature */ |
325 | uint8_t extboot_signature /* extended boot signature */ |
324 | uint32_t serial /* serial number */ |
326 | uint32_t serial /* serial number */ |
325 | char label[11] /* volume label */ |
327 | char label[11] /* volume label */ |
326 | char fstype[8] /* filesystem type */ |
328 | char fstype[8] /* filesystem type */ |
327 | padding[448] /* boot code */ |
329 | padding[448] /* boot code */ |
328 | uint8_t boot_signature[2] /* boot signature */ |
330 | uint8_t boot_signature[2] /* boot signature */ |
329 | """ |
331 | """ |
330 | 332 | ||
331 | EMPTY_SECTOR = """little: |
333 | EMPTY_SECTOR = """little: |
332 | padding[512] /* empty sector data */ |
334 | padding[512] /* empty sector data */ |
333 | """ |
335 | """ |
334 | 336 | ||
335 | FAT_ENTRY = """little: |
337 | FAT_ENTRY = """little: |
336 | uint16_t next /* FAT16 entry */ |
338 | uint16_t next /* FAT16 entry */ |
337 | """ |
339 | """ |
338 | 340 | ||
339 | def usage(prname): |
341 | def usage(prname): |
340 | "Print usage syntax" |
342 | "Print usage syntax" |
341 | print prname + " <PATH> <IMAGE>" |
343 | print prname + " <PATH> <IMAGE>" |
342 | 344 | ||
343 | def main(): |
345 | def main(): |
344 | if (len(sys.argv) < 3): |
346 | if (len(sys.argv) < 3): |
345 | usage(sys.argv[0]) |
347 | usage(sys.argv[0]) |
346 | return |
348 | return |
347 | 349 | ||
348 | path = os.path.abspath(sys.argv[1]) |
350 | path = os.path.abspath(sys.argv[1]) |
349 | if (not os.path.isdir(path)): |
351 | if (not os.path.isdir(path)): |
350 | print "<PATH> must be a directory" |
352 | print "<PATH> must be a directory" |
351 | return |
353 | return |
352 | 354 | ||
353 | fat16_clusters = 4096 |
355 | fat16_clusters = 4096 |
354 | min_cluster_size = 1024 |
- | |
355 | 356 | ||
356 | sector_size = 512 |
357 | sector_size = 512 |
357 | cluster_size = 4096 |
358 | cluster_size = 4096 |
358 | dirent_size = 32 |
359 | dirent_size = 32 |
359 | fatent_size = 2 |
360 | fatent_size = 2 |
360 | fat_count = 2 |
361 | fat_count = 2 |
361 | reserved_clusters = 2 |
362 | reserved_clusters = 2 |
362 | 363 | ||
363 | # Make sure the filesystem is large enought for FAT16 |
364 | # Make sure the filesystem is large enought for FAT16 |
364 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
365 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
365 | while (size / cluster_size < fat16_clusters): |
366 | while (size / cluster_size < fat16_clusters): |
366 | if (cluster_size > min_cluster_size): |
367 | if (cluster_size > sector_size): |
367 | cluster_size /= 2 |
368 | cluster_size /= 2 |
368 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
369 | size = subtree_size(path, cluster_size, dirent_size) + reserved_clusters * cluster_size |
369 | else: |
370 | else: |
370 | size = fat16_clusters * cluster_size + reserved_clusters * cluster_size |
371 | size = fat16_clusters * cluster_size + reserved_clusters * cluster_size |
371 | 372 | ||
372 | root_size = align_up(root_entries(path) * dirent_size, cluster_size) |
373 | root_size = align_up(root_entries(path) * dirent_size, cluster_size) |
373 | 374 | ||
374 | fat_size = align_up(align_up(size, cluster_size) / cluster_size * fatent_size, sector_size) |
375 | fat_size = align_up(align_up(size, cluster_size) / cluster_size * fatent_size, sector_size) |
375 | 376 | ||
376 | sectors = (cluster_size + fat_count * fat_size + root_size + size) / sector_size |
377 | sectors = (cluster_size + fat_count * fat_size + root_size + size) / sector_size |
377 | root_start = cluster_size + fat_count * fat_size |
378 | root_start = cluster_size + fat_count * fat_size |
378 | data_start = root_start + root_size |
379 | data_start = root_start + root_size |
379 | 380 | ||
380 | outf = file(sys.argv[2], "w") |
381 | outf = file(sys.argv[2], "w") |
381 | 382 | ||
382 | boot_sector = xstruct.create(BOOT_SECTOR) |
383 | boot_sector = xstruct.create(BOOT_SECTOR) |
383 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
384 | boot_sector.jmp = [0xEB, 0x3C, 0x90] |
384 | boot_sector.oem = "MSDOS5.0" |
385 | boot_sector.oem = "MSDOS5.0" |
385 | boot_sector.sector = sector_size |
386 | boot_sector.sector = sector_size |
386 | boot_sector.cluster = cluster_size / sector_size |
387 | boot_sector.cluster = cluster_size / sector_size |
387 | boot_sector.reserved = cluster_size / sector_size |
388 | boot_sector.reserved = cluster_size / sector_size |
388 | boot_sector.fats = fat_count |
389 | boot_sector.fats = fat_count |
389 | boot_sector.rootdir = root_size / dirent_size |
390 | boot_sector.rootdir = root_size / dirent_size |
390 | if (sectors <= 65535): |
391 | if (sectors <= 65535): |
391 | boot_sector.sectors = sectors |
392 | boot_sector.sectors = sectors |
392 | else: |
393 | else: |
393 | boot_sector.sectors = 0 |
394 | boot_sector.sectors = 0 |
394 | boot_sector.descriptor = 0xF8 |
395 | boot_sector.descriptor = 0xF8 |
395 | boot_sector.fat_sectors = fat_size / sector_size |
396 | boot_sector.fat_sectors = fat_size / sector_size |
396 | boot_sector.track_sectors = 63 |
397 | boot_sector.track_sectors = 63 |
397 | boot_sector.heads = 6 |
398 | boot_sector.heads = 6 |
398 | boot_sector.hidden = 0 |
399 | boot_sector.hidden = 0 |
399 | if (sectors > 65535): |
400 | if (sectors > 65535): |
400 | boot_sector.sectors_big = sectors |
401 | boot_sector.sectors_big = sectors |
401 | else: |
402 | else: |
402 | boot_sector.sectors_big = 0 |
403 | boot_sector.sectors_big = 0 |
403 | 404 | ||
404 | boot_sector.drive = 0x80 |
405 | boot_sector.drive = 0x80 |
405 | boot_sector.extboot_signature = 0x29 |
406 | boot_sector.extboot_signature = 0x29 |
406 | boot_sector.serial = random.randint(0, 0x7fffffff) |
407 | boot_sector.serial = random.randint(0, 0x7fffffff) |
407 | boot_sector.label = "HELENOS" |
408 | boot_sector.label = "HELENOS" |
408 | boot_sector.fstype = "FAT16 " |
409 | boot_sector.fstype = "FAT16 " |
409 | boot_sector.boot_signature = [0x55, 0xAA] |
410 | boot_sector.boot_signature = [0x55, 0xAA] |
410 | 411 | ||
411 | outf.write(boot_sector.pack()) |
412 | outf.write(boot_sector.pack()) |
412 | 413 | ||
413 | empty_sector = xstruct.create(EMPTY_SECTOR) |
414 | empty_sector = xstruct.create(EMPTY_SECTOR) |
414 | 415 | ||
415 | # Reserved sectors |
416 | # Reserved sectors |
416 | for i in range(1, cluster_size / sector_size): |
417 | for i in range(1, cluster_size / sector_size): |
417 | outf.write(empty_sector.pack()) |
418 | outf.write(empty_sector.pack()) |
418 | 419 | ||
419 | # FAT tables |
420 | # FAT tables |
420 | for i in range(0, fat_count): |
421 | for i in range(0, fat_count): |
421 | for j in range(0, fat_size / sector_size): |
422 | for j in range(0, fat_size / sector_size): |
422 | outf.write(empty_sector.pack()) |
423 | outf.write(empty_sector.pack()) |
423 | 424 | ||
424 | # Root directory |
425 | # Root directory |
425 | for i in range(0, root_size / sector_size): |
426 | for i in range(0, root_size / sector_size): |
426 | outf.write(empty_sector.pack()) |
427 | outf.write(empty_sector.pack()) |
427 | 428 | ||
428 | # Data |
429 | # Data |
429 | for i in range(0, size / sector_size): |
430 | for i in range(0, size / sector_size): |
430 | outf.write(empty_sector.pack()) |
431 | outf.write(empty_sector.pack()) |
431 | 432 | ||
432 | fat = array.array('L', [0] * (fat_size / fatent_size)) |
433 | fat = array.array('L', [0] * (fat_size / fatent_size)) |
433 | fat[0] = 0xfff8 |
434 | fat[0] = 0xfff8 |
434 | fat[1] = 0xffff |
435 | fat[1] = 0xffff |
435 | 436 | ||
436 | recursion(True, path, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, 0) |
437 | recursion(True, path, outf, cluster_size, root_start, data_start, fat, reserved_clusters, dirent_size, 0) |
437 | 438 | ||
438 | # Store FAT |
439 | # Store FAT |
439 | fat_entry = xstruct.create(FAT_ENTRY) |
440 | fat_entry = xstruct.create(FAT_ENTRY) |
440 | for i in range(0, fat_count): |
441 | for i in range(0, fat_count): |
441 | outf.seek(cluster_size + i * fat_size) |
442 | outf.seek(cluster_size + i * fat_size) |
442 | for j in range(0, fat_size / fatent_size): |
443 | for j in range(0, fat_size / fatent_size): |
443 | fat_entry.next = fat[j] |
444 | fat_entry.next = fat[j] |
444 | outf.write(fat_entry.pack()) |
445 | outf.write(fat_entry.pack()) |
445 | 446 | ||
446 | outf.close() |
447 | outf.close() |
447 | 448 | ||
448 | if __name__ == '__main__': |
449 | if __name__ == '__main__': |
449 | main() |
450 | main() |
450 | 451 |