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1 | /* simple-object.c -- simple routines to read and write object files. |
2 | Copyright 2010 Free Software Foundation, Inc. | |
3 | Written by Ian Lance Taylor, Google. | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by the | |
7 | Free Software Foundation; either version 2, or (at your option) any | |
8 | later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, 51 Franklin Street - Fifth Floor, | |
18 | Boston, MA 02110-1301, USA. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "libiberty.h" | |
22 | #include "simple-object.h" | |
23 | ||
24 | #include <errno.h> | |
25 | ||
26 | #ifdef HAVE_STDLIB_H | |
27 | #include <stdlib.h> | |
28 | #endif | |
29 | ||
30 | #ifdef HAVE_STDINT_H | |
31 | #include <stdint.h> | |
32 | #endif | |
33 | ||
34 | #ifdef HAVE_STRING_H | |
35 | #include <string.h> | |
36 | #endif | |
37 | ||
38 | #ifdef HAVE_INTTYPES_H | |
39 | #include <inttypes.h> | |
40 | #endif | |
41 | ||
42 | #ifndef SEEK_SET | |
43 | #define SEEK_SET 0 | |
44 | #endif | |
45 | ||
46 | #include "simple-object-common.h" | |
47 | ||
48 | /* The known object file formats. */ | |
49 | ||
50 | static const struct simple_object_functions * const format_functions[] = | |
51 | { | |
52 | &simple_object_elf_functions, | |
53 | &simple_object_mach_o_functions, | |
54 | &simple_object_coff_functions | |
55 | }; | |
56 | ||
57 | /* Read data from a file using the simple_object error reporting | |
58 | conventions. */ | |
59 | ||
60 | int | |
61 | simple_object_internal_read (int descriptor, off_t offset, | |
62 | unsigned char *buffer, size_t size, | |
63 | const char **errmsg, int *err) | |
64 | { | |
65 | ssize_t got; | |
66 | ||
67 | if (lseek (descriptor, offset, SEEK_SET) < 0) | |
68 | { | |
69 | *errmsg = "lseek"; | |
70 | *err = errno; | |
71 | return 0; | |
72 | } | |
73 | ||
74 | got = read (descriptor, buffer, size); | |
75 | if (got < 0) | |
76 | { | |
77 | *errmsg = "read"; | |
78 | *err = errno; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | if ((size_t) got < size) | |
83 | { | |
84 | *errmsg = "file too short"; | |
85 | *err = 0; | |
86 | return 0; | |
87 | } | |
88 | ||
89 | return 1; | |
90 | } | |
91 | ||
92 | /* Write data to a file using the simple_object error reporting | |
93 | conventions. */ | |
94 | ||
95 | int | |
96 | simple_object_internal_write (int descriptor, off_t offset, | |
97 | const unsigned char *buffer, size_t size, | |
98 | const char **errmsg, int *err) | |
99 | { | |
100 | ssize_t wrote; | |
101 | ||
102 | if (lseek (descriptor, offset, SEEK_SET) < 0) | |
103 | { | |
104 | *errmsg = "lseek"; | |
105 | *err = errno; | |
106 | return 0; | |
107 | } | |
108 | ||
109 | wrote = write (descriptor, buffer, size); | |
110 | if (wrote < 0) | |
111 | { | |
112 | *errmsg = "write"; | |
113 | *err = errno; | |
114 | return 0; | |
115 | } | |
116 | ||
117 | if ((size_t) wrote < size) | |
118 | { | |
119 | *errmsg = "short write"; | |
120 | *err = 0; | |
121 | return 0; | |
122 | } | |
123 | ||
124 | return 1; | |
125 | } | |
126 | ||
127 | /* Open for read. */ | |
128 | ||
129 | simple_object_read * | |
130 | simple_object_start_read (int descriptor, off_t offset, | |
131 | const char *segment_name, const char **errmsg, | |
132 | int *err) | |
133 | { | |
134 | unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN]; | |
135 | size_t len, i; | |
136 | ||
137 | if (!simple_object_internal_read (descriptor, offset, header, | |
138 | SIMPLE_OBJECT_MATCH_HEADER_LEN, | |
139 | errmsg, err)) | |
140 | return NULL; | |
141 | ||
142 | len = sizeof (format_functions) / sizeof (format_functions[0]); | |
143 | for (i = 0; i < len; ++i) | |
144 | { | |
145 | void *data; | |
146 | ||
147 | data = format_functions[i]->match (header, descriptor, offset, | |
148 | segment_name, errmsg, err); | |
149 | if (data != NULL) | |
150 | { | |
151 | simple_object_read *ret; | |
152 | ||
153 | ret = XNEW (simple_object_read); | |
154 | ret->descriptor = descriptor; | |
155 | ret->offset = offset; | |
156 | ret->functions = format_functions[i]; | |
157 | ret->data = data; | |
158 | return ret; | |
159 | } | |
160 | } | |
161 | ||
162 | *errmsg = "file not recognized"; | |
163 | *err = 0; | |
164 | return NULL; | |
165 | } | |
166 | ||
167 | /* Find all sections. */ | |
168 | ||
169 | const char * | |
170 | simple_object_find_sections (simple_object_read *sobj, | |
171 | int (*pfn) (void *, const char *, off_t, off_t), | |
172 | void *data, | |
173 | int *err) | |
174 | { | |
175 | return sobj->functions->find_sections (sobj, pfn, data, err); | |
176 | } | |
177 | ||
178 | /* Internal data passed to find_one_section. */ | |
179 | ||
180 | struct find_one_section_data | |
181 | { | |
182 | /* The section we are looking for. */ | |
183 | const char *name; | |
184 | /* Where to store the section offset. */ | |
185 | off_t *offset; | |
186 | /* Where to store the section length. */ | |
187 | off_t *length; | |
188 | /* Set if the name is found. */ | |
189 | int found; | |
190 | }; | |
191 | ||
192 | /* Internal function passed to find_sections. */ | |
193 | ||
194 | static int | |
195 | find_one_section (void *data, const char *name, off_t offset, off_t length) | |
196 | { | |
197 | struct find_one_section_data *fosd = (struct find_one_section_data *) data; | |
198 | ||
199 | if (strcmp (name, fosd->name) != 0) | |
200 | return 1; | |
201 | ||
202 | *fosd->offset = offset; | |
203 | *fosd->length = length; | |
204 | fosd->found = 1; | |
205 | ||
206 | /* Stop iteration. */ | |
207 | return 0; | |
208 | } | |
209 | ||
210 | /* Find a section. */ | |
211 | ||
212 | int | |
213 | simple_object_find_section (simple_object_read *sobj, const char *name, | |
214 | off_t *offset, off_t *length, | |
215 | const char **errmsg, int *err) | |
216 | { | |
217 | struct find_one_section_data fosd; | |
218 | ||
219 | fosd.name = name; | |
220 | fosd.offset = offset; | |
221 | fosd.length = length; | |
222 | fosd.found = 0; | |
223 | ||
224 | *errmsg = simple_object_find_sections (sobj, find_one_section, | |
225 | (void *) &fosd, err); | |
226 | if (*errmsg != NULL) | |
227 | return 0; | |
228 | if (!fosd.found) | |
229 | return 0; | |
230 | return 1; | |
231 | } | |
232 | ||
233 | /* Fetch attributes. */ | |
234 | ||
235 | simple_object_attributes * | |
236 | simple_object_fetch_attributes (simple_object_read *sobj, const char **errmsg, | |
237 | int *err) | |
238 | { | |
239 | void *data; | |
240 | simple_object_attributes *ret; | |
241 | ||
242 | data = sobj->functions->fetch_attributes (sobj, errmsg, err); | |
243 | if (data == NULL) | |
244 | return NULL; | |
245 | ret = XNEW (simple_object_attributes); | |
246 | ret->functions = sobj->functions; | |
247 | ret->data = data; | |
248 | return ret; | |
249 | } | |
250 | ||
251 | /* Release an simple_object_read. */ | |
252 | ||
253 | void | |
254 | simple_object_release_read (simple_object_read *sobj) | |
255 | { | |
256 | sobj->functions->release_read (sobj->data); | |
257 | XDELETE (sobj); | |
258 | } | |
259 | ||
260 | /* Compare attributes. */ | |
261 | ||
262 | const char * | |
263 | simple_object_attributes_compare (simple_object_attributes *attrs1, | |
264 | simple_object_attributes *attrs2, | |
265 | int *err) | |
266 | { | |
267 | if (attrs1->functions != attrs2->functions) | |
268 | { | |
269 | *err = 0; | |
270 | return "different object file format"; | |
271 | } | |
272 | return attrs1->functions->attributes_compare (attrs1->data, attrs2->data, | |
273 | err); | |
274 | } | |
275 | ||
276 | /* Release an attributes structure. */ | |
277 | ||
278 | void | |
279 | simple_object_release_attributes (simple_object_attributes *attrs) | |
280 | { | |
281 | attrs->functions->release_attributes (attrs->data); | |
282 | XDELETE (attrs); | |
283 | } | |
284 | ||
285 | /* Start creating an object file. */ | |
286 | ||
287 | simple_object_write * | |
288 | simple_object_start_write (simple_object_attributes *attrs, | |
289 | const char *segment_name, const char **errmsg, | |
290 | int *err) | |
291 | { | |
292 | void *data; | |
293 | simple_object_write *ret; | |
294 | ||
295 | data = attrs->functions->start_write (attrs->data, errmsg, err); | |
296 | if (data == NULL) | |
297 | return NULL; | |
298 | ret = XNEW (simple_object_write); | |
299 | ret->functions = attrs->functions; | |
300 | ret->segment_name = xstrdup (segment_name); | |
301 | ret->sections = NULL; | |
302 | ret->last_section = NULL; | |
303 | ret->data = data; | |
304 | return ret; | |
305 | } | |
306 | ||
307 | /* Start creating a section. */ | |
308 | ||
309 | simple_object_write_section * | |
310 | simple_object_write_create_section (simple_object_write *sobj, const char *name, | |
311 | unsigned int align, | |
312 | const char **errmsg ATTRIBUTE_UNUSED, | |
313 | int *err ATTRIBUTE_UNUSED) | |
314 | { | |
315 | simple_object_write_section *ret; | |
316 | ||
317 | ret = XNEW (simple_object_write_section); | |
318 | ret->next = NULL; | |
319 | ret->name = xstrdup (name); | |
320 | ret->align = align; | |
321 | ret->buffers = NULL; | |
322 | ret->last_buffer = NULL; | |
323 | ||
324 | if (sobj->last_section == NULL) | |
325 | { | |
326 | sobj->sections = ret; | |
327 | sobj->last_section = ret; | |
328 | } | |
329 | else | |
330 | { | |
331 | sobj->last_section->next = ret; | |
332 | sobj->last_section = ret; | |
333 | } | |
334 | ||
335 | return ret; | |
336 | } | |
337 | ||
338 | /* Add data to a section. */ | |
339 | ||
340 | const char * | |
341 | simple_object_write_add_data (simple_object_write *sobj ATTRIBUTE_UNUSED, | |
342 | simple_object_write_section *section, | |
343 | const void *buffer, | |
344 | size_t size, int copy, | |
345 | int *err ATTRIBUTE_UNUSED) | |
346 | { | |
347 | struct simple_object_write_section_buffer *wsb; | |
348 | ||
349 | wsb = XNEW (struct simple_object_write_section_buffer); | |
350 | wsb->next = NULL; | |
351 | wsb->size = size; | |
352 | ||
353 | if (!copy) | |
354 | { | |
355 | wsb->buffer = buffer; | |
356 | wsb->free_buffer = NULL; | |
357 | } | |
358 | else | |
359 | { | |
360 | wsb->free_buffer = (void *) XNEWVEC (char, size); | |
361 | memcpy (wsb->free_buffer, buffer, size); | |
362 | wsb->buffer = wsb->free_buffer; | |
363 | } | |
364 | ||
365 | if (section->last_buffer == NULL) | |
366 | { | |
367 | section->buffers = wsb; | |
368 | section->last_buffer = wsb; | |
369 | } | |
370 | else | |
371 | { | |
372 | section->last_buffer->next = wsb; | |
373 | section->last_buffer = wsb; | |
374 | } | |
375 | ||
376 | return NULL; | |
377 | } | |
378 | ||
379 | /* Write the complete object file. */ | |
380 | ||
381 | const char * | |
382 | simple_object_write_to_file (simple_object_write *sobj, int descriptor, | |
383 | int *err) | |
384 | { | |
385 | return sobj->functions->write_to_file (sobj, descriptor, err); | |
386 | } | |
387 | ||
388 | /* Release an simple_object_write. */ | |
389 | ||
390 | void | |
391 | simple_object_release_write (simple_object_write *sobj) | |
392 | { | |
393 | simple_object_write_section *section; | |
394 | ||
395 | free (sobj->segment_name); | |
396 | ||
397 | section = sobj->sections; | |
398 | while (section != NULL) | |
399 | { | |
400 | struct simple_object_write_section_buffer *buffer; | |
401 | simple_object_write_section *next_section; | |
402 | ||
403 | buffer = section->buffers; | |
404 | while (buffer != NULL) | |
405 | { | |
406 | struct simple_object_write_section_buffer *next_buffer; | |
407 | ||
408 | if (buffer->free_buffer != NULL) | |
409 | XDELETEVEC (buffer->free_buffer); | |
410 | next_buffer = buffer->next; | |
411 | XDELETE (buffer); | |
412 | buffer = next_buffer; | |
413 | } | |
414 | ||
415 | next_section = section->next; | |
416 | free (section->name); | |
417 | XDELETE (section); | |
418 | section = next_section; | |
419 | } | |
420 | ||
421 | sobj->functions->release_write (sobj->data); | |
422 | XDELETE (sobj); | |
423 | } |