Commit | Line | Data |
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0acf065b | 1 | /* Compressed section support (intended for debug sections). |
250d07de | 2 | Copyright (C) 2008-2021 Free Software Foundation, Inc. |
1b315056 CS |
3 | |
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 3 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, | |
19 | MA 02110-1301, USA. */ | |
20 | ||
1b315056 | 21 | #include "sysdep.h" |
243340ad | 22 | #include <zlib.h> |
1b315056 CS |
23 | #include "bfd.h" |
24 | #include "libbfd.h" | |
a953eec9 | 25 | #include "safe-ctype.h" |
1b315056 | 26 | |
151411f8 L |
27 | #define MAX_COMPRESSION_HEADER_SIZE 24 |
28 | ||
4a114e3e L |
29 | static bfd_boolean |
30 | decompress_contents (bfd_byte *compressed_buffer, | |
31 | bfd_size_type compressed_size, | |
32 | bfd_byte *uncompressed_buffer, | |
33 | bfd_size_type uncompressed_size) | |
34 | { | |
35 | z_stream strm; | |
36 | int rc; | |
37 | ||
38 | /* It is possible the section consists of several compressed | |
39 | buffers concatenated together, so we uncompress in a loop. */ | |
de13ef81 NC |
40 | /* PR 18313: The state field in the z_stream structure is supposed |
41 | to be invisible to the user (ie us), but some compilers will | |
42 | still complain about it being used without initialisation. So | |
43 | we first zero the entire z_stream structure and then set the fields | |
44 | that we need. */ | |
45 | memset (& strm, 0, sizeof strm); | |
dab394de L |
46 | strm.avail_in = compressed_size; |
47 | strm.next_in = (Bytef*) compressed_buffer; | |
4a114e3e L |
48 | strm.avail_out = uncompressed_size; |
49 | ||
a253d456 | 50 | BFD_ASSERT (Z_OK == 0); |
4a114e3e | 51 | rc = inflateInit (&strm); |
a29a8af8 | 52 | while (strm.avail_in > 0 && strm.avail_out > 0) |
4a114e3e L |
53 | { |
54 | if (rc != Z_OK) | |
a253d456 | 55 | break; |
4a114e3e | 56 | strm.next_out = ((Bytef*) uncompressed_buffer |
07d6d2b8 | 57 | + (uncompressed_size - strm.avail_out)); |
4a114e3e L |
58 | rc = inflate (&strm, Z_FINISH); |
59 | if (rc != Z_STREAM_END) | |
a253d456 | 60 | break; |
4a114e3e L |
61 | rc = inflateReset (&strm); |
62 | } | |
ad92f33d | 63 | return inflateEnd (&strm) == Z_OK && rc == Z_OK && strm.avail_out == 0; |
4a114e3e | 64 | } |
4a114e3e | 65 | |
0b0732e1 L |
66 | /* Compress data of the size specified in @var{uncompressed_size} |
67 | and pointed to by @var{uncompressed_buffer} using zlib and store | |
68 | as the contents field. This function assumes the contents | |
18ece1de | 69 | field was allocated using bfd_malloc() or equivalent. |
1b315056 | 70 | |
151411f8 L |
71 | Return the uncompressed size if the full section contents is |
72 | compressed successfully. Otherwise return 0. */ | |
1b315056 | 73 | |
151411f8 L |
74 | static bfd_size_type |
75 | bfd_compress_section_contents (bfd *abfd, sec_ptr sec, | |
243340ad | 76 | bfd_byte *uncompressed_buffer, |
3e19fb8f | 77 | bfd_size_type uncompressed_size) |
1b315056 | 78 | { |
ae6a0217 | 79 | uLong compressed_size; |
151411f8 L |
80 | bfd_byte *buffer; |
81 | bfd_size_type buffer_size; | |
82 | bfd_boolean decompress; | |
51509926 | 83 | int zlib_size = 0; |
151411f8 | 84 | int orig_compression_header_size; |
dab394de | 85 | bfd_size_type orig_uncompressed_size; |
4207142d | 86 | unsigned int orig_uncompressed_alignment_pow; |
dab394de | 87 | int header_size = bfd_get_compression_header_size (abfd, NULL); |
151411f8 L |
88 | bfd_boolean compressed |
89 | = bfd_is_section_compressed_with_header (abfd, sec, | |
dab394de | 90 | &orig_compression_header_size, |
4207142d MW |
91 | &orig_uncompressed_size, |
92 | &orig_uncompressed_alignment_pow); | |
dab394de L |
93 | |
94 | /* Either ELF compression header or the 12-byte, "ZLIB" + 8-byte size, | |
95 | overhead in .zdebug* section. */ | |
96 | if (!header_size) | |
97 | header_size = 12; | |
151411f8 L |
98 | |
99 | if (compressed) | |
100 | { | |
101 | /* We shouldn't decompress unsupported compressed section. */ | |
102 | if (orig_compression_header_size < 0) | |
103 | abort (); | |
4a114e3e | 104 | |
151411f8 L |
105 | /* Different compression schemes. Just move the compressed section |
106 | contents to the right position. */ | |
107 | if (orig_compression_header_size == 0) | |
108 | { | |
109 | /* Convert it from .zdebug* section. Get the uncompressed | |
de194d85 | 110 | size first. We need to subtract the 12-byte overhead in |
dab394de L |
111 | .zdebug* section. Set orig_compression_header_size to |
112 | the 12-bye overhead. */ | |
113 | orig_compression_header_size = 12; | |
114 | zlib_size = uncompressed_size - 12; | |
151411f8 L |
115 | } |
116 | else | |
117 | { | |
dab394de | 118 | /* Convert it to .zdebug* section. */ |
151411f8 | 119 | zlib_size = uncompressed_size - orig_compression_header_size; |
151411f8 | 120 | } |
dab394de L |
121 | |
122 | /* Add the header size. */ | |
123 | compressed_size = zlib_size + header_size; | |
151411f8 L |
124 | } |
125 | else | |
dab394de | 126 | compressed_size = compressBound (uncompressed_size) + header_size; |
4281caad | 127 | |
dab394de L |
128 | /* Uncompress if it leads to smaller size. */ |
129 | if (compressed && compressed_size > orig_uncompressed_size) | |
4a114e3e | 130 | { |
151411f8 | 131 | decompress = TRUE; |
dab394de | 132 | buffer_size = orig_uncompressed_size; |
4a114e3e | 133 | } |
151411f8 L |
134 | else |
135 | { | |
136 | decompress = FALSE; | |
dab394de | 137 | buffer_size = compressed_size; |
151411f8 | 138 | } |
030aeb75 | 139 | buffer = (bfd_byte *) bfd_alloc (abfd, buffer_size); |
151411f8 L |
140 | if (buffer == NULL) |
141 | return 0; | |
4a114e3e | 142 | |
151411f8 | 143 | if (compressed) |
8d001214 | 144 | { |
dab394de | 145 | sec->size = orig_uncompressed_size; |
151411f8 L |
146 | if (decompress) |
147 | { | |
dab394de L |
148 | if (!decompress_contents (uncompressed_buffer |
149 | + orig_compression_header_size, | |
150 | zlib_size, buffer, buffer_size)) | |
151411f8 L |
151 | { |
152 | bfd_set_error (bfd_error_bad_value); | |
030aeb75 | 153 | bfd_release (abfd, buffer); |
151411f8 L |
154 | return 0; |
155 | } | |
156 | free (uncompressed_buffer); | |
fd361982 | 157 | bfd_set_section_alignment (sec, orig_uncompressed_alignment_pow); |
4207142d | 158 | |
151411f8 L |
159 | sec->contents = buffer; |
160 | sec->compress_status = COMPRESS_SECTION_DONE; | |
dab394de | 161 | return orig_uncompressed_size; |
151411f8 L |
162 | } |
163 | else | |
164 | { | |
165 | bfd_update_compression_header (abfd, buffer, sec); | |
dab394de | 166 | memmove (buffer + header_size, |
151411f8 L |
167 | uncompressed_buffer + orig_compression_header_size, |
168 | zlib_size); | |
169 | } | |
8d001214 L |
170 | } |
171 | else | |
172 | { | |
151411f8 L |
173 | if (compress ((Bytef*) buffer + header_size, |
174 | &compressed_size, | |
175 | (const Bytef*) uncompressed_buffer, | |
176 | uncompressed_size) != Z_OK) | |
177 | { | |
030aeb75 | 178 | bfd_release (abfd, buffer); |
151411f8 L |
179 | bfd_set_error (bfd_error_bad_value); |
180 | return 0; | |
181 | } | |
182 | ||
183 | compressed_size += header_size; | |
184 | /* PR binutils/18087: If compression didn't make the section smaller, | |
3e19fb8f L |
185 | just keep it uncompressed. */ |
186 | if (compressed_size < uncompressed_size) | |
dab394de | 187 | bfd_update_compression_header (abfd, buffer, sec); |
151411f8 L |
188 | else |
189 | { | |
030aeb75 L |
190 | /* NOTE: There is a small memory leak here since |
191 | uncompressed_buffer is malloced and won't be freed. */ | |
192 | bfd_release (abfd, buffer); | |
151411f8 L |
193 | sec->contents = uncompressed_buffer; |
194 | sec->compress_status = COMPRESS_SECTION_NONE; | |
195 | return uncompressed_size; | |
196 | } | |
8d001214 | 197 | } |
4a114e3e | 198 | |
151411f8 L |
199 | free (uncompressed_buffer); |
200 | sec->contents = buffer; | |
201 | sec->size = compressed_size; | |
202 | sec->compress_status = COMPRESS_SECTION_DONE; | |
203 | ||
204 | return uncompressed_size; | |
4a114e3e L |
205 | } |
206 | ||
207 | /* | |
208 | FUNCTION | |
209 | bfd_get_full_section_contents | |
210 | ||
211 | SYNOPSIS | |
212 | bfd_boolean bfd_get_full_section_contents | |
213 | (bfd *abfd, asection *section, bfd_byte **ptr); | |
214 | ||
215 | DESCRIPTION | |
216 | Read all data from @var{section} in BFD @var{abfd}, decompress | |
217 | if needed, and store in @var{*ptr}. If @var{*ptr} is NULL, | |
68ffbac6 | 218 | return @var{*ptr} with memory malloc'd by this function. |
4a114e3e L |
219 | |
220 | Return @code{TRUE} if the full section contents is retrieved | |
06614111 NC |
221 | successfully. If the section has no contents then this function |
222 | returns @code{TRUE} but @var{*ptr} is set to NULL. | |
4a114e3e L |
223 | */ |
224 | ||
225 | bfd_boolean | |
226 | bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr) | |
227 | { | |
e57278ef | 228 | bfd_size_type sz; |
4a114e3e | 229 | bfd_byte *p = *ptr; |
82c6068a | 230 | bfd_boolean ret; |
38b774d2 AM |
231 | bfd_size_type save_size; |
232 | bfd_size_type save_rawsize; | |
4a114e3e | 233 | bfd_byte *compressed_buffer; |
151411f8 | 234 | unsigned int compression_header_size; |
4a114e3e | 235 | |
e57278ef AM |
236 | if (abfd->direction != write_direction && sec->rawsize != 0) |
237 | sz = sec->rawsize; | |
238 | else | |
239 | sz = sec->size; | |
4a114e3e | 240 | if (sz == 0) |
06614111 NC |
241 | { |
242 | *ptr = NULL; | |
243 | return TRUE; | |
244 | } | |
4a114e3e L |
245 | |
246 | switch (sec->compress_status) | |
247 | { | |
248 | case COMPRESS_SECTION_NONE: | |
249 | if (p == NULL) | |
250 | { | |
7e56c51c NC |
251 | ufile_ptr filesize = bfd_get_file_size (abfd); |
252 | if (filesize > 0 | |
253 | && filesize < sz | |
125f83f6 NC |
254 | /* PR 24753: Linker created sections can be larger than |
255 | the file size, eg if they are being used to hold stubs. */ | |
fd361982 | 256 | && (bfd_section_flags (sec) & SEC_LINKER_CREATED) == 0 |
c36876fe TC |
257 | /* PR 24753: Sections which have no content should also be |
258 | excluded as they contain no size on disk. */ | |
259 | && (bfd_section_flags (sec) & SEC_HAS_CONTENTS) != 0 | |
7e56c51c NC |
260 | /* The MMO file format supports its own special compression |
261 | technique, but it uses COMPRESS_SECTION_NONE when loading | |
262 | a section's contents. */ | |
263 | && bfd_get_flavour (abfd) != bfd_target_mmo_flavour) | |
264 | { | |
265 | /* PR 24708: Avoid attempts to allocate a ridiculous amount | |
266 | of memory. */ | |
267 | bfd_set_error (bfd_error_no_memory); | |
268 | _bfd_error_handler | |
269 | /* xgettext:c-format */ | |
270 | (_("error: %pB(%pA) section size (%#" PRIx64 " bytes) is larger than file size (%#" PRIx64 " bytes)"), | |
271 | abfd, sec, (uint64_t) sz, (uint64_t) filesize); | |
272 | return FALSE; | |
273 | } | |
0d13c96b | 274 | p = (bfd_byte *) bfd_malloc (sz); |
4a114e3e | 275 | if (p == NULL) |
a18590c3 NC |
276 | { |
277 | /* PR 20801: Provide a more helpful error message. */ | |
278 | if (bfd_get_error () == bfd_error_no_memory) | |
279 | _bfd_error_handler | |
280 | /* xgettext:c-format */ | |
2dcf00ce AM |
281 | (_("error: %pB(%pA) is too large (%#" PRIx64 " bytes)"), |
282 | abfd, sec, (uint64_t) sz); | |
0630b49c | 283 | return FALSE; |
a18590c3 | 284 | } |
4a114e3e | 285 | } |
06614111 | 286 | |
82c6068a AM |
287 | if (!bfd_get_section_contents (abfd, sec, p, 0, sz)) |
288 | { | |
289 | if (*ptr != p) | |
290 | free (p); | |
291 | return FALSE; | |
292 | } | |
293 | *ptr = p; | |
4a114e3e L |
294 | return TRUE; |
295 | ||
296 | case DECOMPRESS_SECTION_SIZED: | |
82c6068a | 297 | /* Read in the full compressed section contents. */ |
38b774d2 | 298 | compressed_buffer = (bfd_byte *) bfd_malloc (sec->compressed_size); |
82c6068a AM |
299 | if (compressed_buffer == NULL) |
300 | return FALSE; | |
38b774d2 AM |
301 | save_rawsize = sec->rawsize; |
302 | save_size = sec->size; | |
82c6068a AM |
303 | /* Clear rawsize, set size to compressed size and set compress_status |
304 | to COMPRESS_SECTION_NONE. If the compressed size is bigger than | |
305 | the uncompressed size, bfd_get_section_contents will fail. */ | |
306 | sec->rawsize = 0; | |
38b774d2 | 307 | sec->size = sec->compressed_size; |
82c6068a AM |
308 | sec->compress_status = COMPRESS_SECTION_NONE; |
309 | ret = bfd_get_section_contents (abfd, sec, compressed_buffer, | |
38b774d2 | 310 | 0, sec->compressed_size); |
82c6068a | 311 | /* Restore rawsize and size. */ |
38b774d2 AM |
312 | sec->rawsize = save_rawsize; |
313 | sec->size = save_size; | |
4a114e3e | 314 | sec->compress_status = DECOMPRESS_SECTION_SIZED; |
82c6068a AM |
315 | if (!ret) |
316 | goto fail_compressed; | |
4a114e3e | 317 | |
38b774d2 AM |
318 | if (p == NULL) |
319 | p = (bfd_byte *) bfd_malloc (sz); | |
320 | if (p == NULL) | |
4a114e3e | 321 | goto fail_compressed; |
4a114e3e | 322 | |
151411f8 | 323 | compression_header_size = bfd_get_compression_header_size (abfd, sec); |
dab394de L |
324 | if (compression_header_size == 0) |
325 | /* Set header size to the zlib header size if it is a | |
326 | SHF_COMPRESSED section. */ | |
327 | compression_header_size = 12; | |
151411f8 | 328 | if (!decompress_contents (compressed_buffer + compression_header_size, |
6438d1be | 329 | sec->compressed_size - compression_header_size, p, sz)) |
82c6068a AM |
330 | { |
331 | bfd_set_error (bfd_error_bad_value); | |
38b774d2 AM |
332 | if (p != *ptr) |
333 | free (p); | |
82c6068a AM |
334 | fail_compressed: |
335 | free (compressed_buffer); | |
336 | return FALSE; | |
337 | } | |
4a114e3e | 338 | |
82c6068a | 339 | free (compressed_buffer); |
38b774d2 AM |
340 | *ptr = p; |
341 | return TRUE; | |
4a114e3e | 342 | |
82c6068a | 343 | case COMPRESS_SECTION_DONE: |
db6b071a NC |
344 | if (sec->contents == NULL) |
345 | return FALSE; | |
82c6068a AM |
346 | if (p == NULL) |
347 | { | |
348 | p = (bfd_byte *) bfd_malloc (sz); | |
349 | if (p == NULL) | |
350 | return FALSE; | |
351 | *ptr = p; | |
352 | } | |
06614111 NC |
353 | /* PR 17512; file: 5bc29788. */ |
354 | if (p != sec->contents) | |
355 | memcpy (p, sec->contents, sz); | |
82c6068a | 356 | return TRUE; |
4a114e3e | 357 | |
82c6068a AM |
358 | default: |
359 | abort (); | |
360 | } | |
4a114e3e L |
361 | } |
362 | ||
8a72cc6e AM |
363 | /* |
364 | FUNCTION | |
365 | bfd_cache_section_contents | |
366 | ||
367 | SYNOPSIS | |
368 | void bfd_cache_section_contents | |
369 | (asection *sec, void *contents); | |
370 | ||
371 | DESCRIPTION | |
372 | Stash @var(contents) so any following reads of @var(sec) do | |
373 | not need to decompress again. | |
374 | */ | |
375 | ||
376 | void | |
377 | bfd_cache_section_contents (asection *sec, void *contents) | |
378 | { | |
379 | if (sec->compress_status == DECOMPRESS_SECTION_SIZED) | |
380 | sec->compress_status = COMPRESS_SECTION_DONE; | |
381 | sec->contents = contents; | |
382 | sec->flags |= SEC_IN_MEMORY; | |
383 | } | |
384 | ||
4a114e3e L |
385 | /* |
386 | FUNCTION | |
151411f8 | 387 | bfd_is_section_compressed_with_header |
4a114e3e L |
388 | |
389 | SYNOPSIS | |
151411f8 L |
390 | bfd_boolean bfd_is_section_compressed_with_header |
391 | (bfd *abfd, asection *section, | |
dab394de | 392 | int *compression_header_size_p, |
4207142d MW |
393 | bfd_size_type *uncompressed_size_p, |
394 | unsigned int *uncompressed_alignment_power_p); | |
4a114e3e L |
395 | |
396 | DESCRIPTION | |
151411f8 | 397 | Return @code{TRUE} if @var{section} is compressed. Compression |
4207142d MW |
398 | header size is returned in @var{compression_header_size_p}, |
399 | uncompressed size is returned in @var{uncompressed_size_p} | |
400 | and the uncompressed data alignement power is returned in | |
401 | @var{uncompressed_align_pow_p}. If compression is | |
402 | unsupported, compression header size is returned with -1 | |
403 | and uncompressed size is returned with 0. | |
4a114e3e L |
404 | */ |
405 | ||
406 | bfd_boolean | |
151411f8 | 407 | bfd_is_section_compressed_with_header (bfd *abfd, sec_ptr sec, |
dab394de | 408 | int *compression_header_size_p, |
4207142d MW |
409 | bfd_size_type *uncompressed_size_p, |
410 | unsigned int *uncompressed_align_pow_p) | |
4a114e3e | 411 | { |
dab394de | 412 | bfd_byte header[MAX_COMPRESSION_HEADER_SIZE]; |
151411f8 | 413 | int compression_header_size; |
dab394de | 414 | int header_size; |
64f40162 L |
415 | unsigned int saved = sec->compress_status; |
416 | bfd_boolean compressed; | |
417 | ||
131a5a64 L |
418 | *uncompressed_align_pow_p = 0; |
419 | ||
151411f8 L |
420 | compression_header_size = bfd_get_compression_header_size (abfd, sec); |
421 | if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE) | |
422 | abort (); | |
dab394de | 423 | header_size = compression_header_size ? compression_header_size : 12; |
151411f8 | 424 | |
64f40162 L |
425 | /* Don't decompress the section. */ |
426 | sec->compress_status = COMPRESS_SECTION_NONE; | |
4a114e3e | 427 | |
dab394de L |
428 | /* Read the header. */ |
429 | if (bfd_get_section_contents (abfd, sec, header, 0, header_size)) | |
430 | { | |
431 | if (compression_header_size == 0) | |
07d6d2b8 | 432 | /* In this case, it should be "ZLIB" followed by the uncompressed |
dab394de | 433 | section size, 8 bytes in big-endian order. */ |
08dedd66 | 434 | compressed = startswith ((char*) header , "ZLIB"); |
dab394de L |
435 | else |
436 | compressed = TRUE; | |
437 | } | |
438 | else | |
439 | compressed = FALSE; | |
64f40162 | 440 | |
dab394de | 441 | *uncompressed_size_p = sec->size; |
151411f8 L |
442 | if (compressed) |
443 | { | |
444 | if (compression_header_size != 0) | |
445 | { | |
151411f8 | 446 | if (!bfd_check_compression_header (abfd, header, sec, |
4207142d MW |
447 | uncompressed_size_p, |
448 | uncompressed_align_pow_p)) | |
151411f8 L |
449 | compression_header_size = -1; |
450 | } | |
451 | /* Check for the pathalogical case of a debug string section that | |
452 | contains the string ZLIB.... as the first entry. We assume that | |
453 | no uncompressed .debug_str section would ever be big enough to | |
454 | have the first byte of its (big-endian) size be non-zero. */ | |
455 | else if (strcmp (sec->name, ".debug_str") == 0 | |
dab394de | 456 | && ISPRINT (header[4])) |
151411f8 | 457 | compressed = FALSE; |
dab394de L |
458 | else |
459 | *uncompressed_size_p = bfd_getb64 (header + 4); | |
151411f8 | 460 | } |
a953eec9 | 461 | |
64f40162 L |
462 | /* Restore compress_status. */ |
463 | sec->compress_status = saved; | |
151411f8 | 464 | *compression_header_size_p = compression_header_size; |
64f40162 | 465 | return compressed; |
4a114e3e L |
466 | } |
467 | ||
151411f8 L |
468 | /* |
469 | FUNCTION | |
470 | bfd_is_section_compressed | |
471 | ||
472 | SYNOPSIS | |
473 | bfd_boolean bfd_is_section_compressed | |
474 | (bfd *abfd, asection *section); | |
475 | ||
476 | DESCRIPTION | |
477 | Return @code{TRUE} if @var{section} is compressed. | |
478 | */ | |
479 | ||
480 | bfd_boolean | |
481 | bfd_is_section_compressed (bfd *abfd, sec_ptr sec) | |
482 | { | |
483 | int compression_header_size; | |
dab394de | 484 | bfd_size_type uncompressed_size; |
4207142d | 485 | unsigned int uncompressed_align_power; |
151411f8 | 486 | return (bfd_is_section_compressed_with_header (abfd, sec, |
dab394de | 487 | &compression_header_size, |
4207142d MW |
488 | &uncompressed_size, |
489 | &uncompressed_align_power) | |
dab394de L |
490 | && compression_header_size >= 0 |
491 | && uncompressed_size > 0); | |
151411f8 L |
492 | } |
493 | ||
4a114e3e L |
494 | /* |
495 | FUNCTION | |
496 | bfd_init_section_decompress_status | |
497 | ||
498 | SYNOPSIS | |
499 | bfd_boolean bfd_init_section_decompress_status | |
500 | (bfd *abfd, asection *section); | |
501 | ||
502 | DESCRIPTION | |
503 | Record compressed section size, update section size with | |
504 | decompressed size and set compress_status to | |
505 | DECOMPRESS_SECTION_SIZED. | |
506 | ||
507 | Return @code{FALSE} if the section is not a valid compressed | |
18ece1de | 508 | section. Otherwise, return @code{TRUE}. |
4a114e3e L |
509 | */ |
510 | ||
511 | bfd_boolean | |
243340ad | 512 | bfd_init_section_decompress_status (bfd *abfd, sec_ptr sec) |
4a114e3e | 513 | { |
dab394de | 514 | bfd_byte header[MAX_COMPRESSION_HEADER_SIZE]; |
151411f8 | 515 | int compression_header_size; |
dab394de | 516 | int header_size; |
4a114e3e | 517 | bfd_size_type uncompressed_size; |
4207142d | 518 | unsigned int uncompressed_alignment_power = 0; |
4a114e3e | 519 | |
151411f8 L |
520 | compression_header_size = bfd_get_compression_header_size (abfd, sec); |
521 | if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE) | |
522 | abort (); | |
dab394de | 523 | header_size = compression_header_size ? compression_header_size : 12; |
151411f8 | 524 | |
dab394de | 525 | /* Read the header. */ |
4a114e3e L |
526 | if (sec->rawsize != 0 |
527 | || sec->contents != NULL | |
528 | || sec->compress_status != COMPRESS_SECTION_NONE | |
151411f8 | 529 | || !bfd_get_section_contents (abfd, sec, header, 0, header_size)) |
4a114e3e L |
530 | { |
531 | bfd_set_error (bfd_error_invalid_operation); | |
532 | return FALSE; | |
533 | } | |
1b315056 | 534 | |
dab394de | 535 | if (compression_header_size == 0) |
4a114e3e | 536 | { |
dab394de L |
537 | /* In this case, it should be "ZLIB" followed by the uncompressed |
538 | section size, 8 bytes in big-endian order. */ | |
08dedd66 | 539 | if (! startswith ((char*) header, "ZLIB")) |
dab394de L |
540 | { |
541 | bfd_set_error (bfd_error_wrong_format); | |
542 | return FALSE; | |
543 | } | |
544 | uncompressed_size = bfd_getb64 (header + 4); | |
4a114e3e | 545 | } |
dab394de | 546 | else if (!bfd_check_compression_header (abfd, header, sec, |
4207142d MW |
547 | &uncompressed_size, |
548 | &uncompressed_alignment_power)) | |
151411f8 L |
549 | { |
550 | bfd_set_error (bfd_error_wrong_format); | |
551 | return FALSE; | |
552 | } | |
dab394de | 553 | |
4a114e3e L |
554 | sec->compressed_size = sec->size; |
555 | sec->size = uncompressed_size; | |
fd361982 | 556 | bfd_set_section_alignment (sec, uncompressed_alignment_power); |
4a114e3e | 557 | sec->compress_status = DECOMPRESS_SECTION_SIZED; |
1b315056 | 558 | |
4a114e3e | 559 | return TRUE; |
4a114e3e L |
560 | } |
561 | ||
562 | /* | |
563 | FUNCTION | |
564 | bfd_init_section_compress_status | |
565 | ||
566 | SYNOPSIS | |
567 | bfd_boolean bfd_init_section_compress_status | |
568 | (bfd *abfd, asection *section); | |
569 | ||
570 | DESCRIPTION | |
571 | If open for read, compress section, update section size with | |
572 | compressed size and set compress_status to COMPRESS_SECTION_DONE. | |
573 | ||
574 | Return @code{FALSE} if the section is not a valid compressed | |
18ece1de | 575 | section. Otherwise, return @code{TRUE}. |
4a114e3e L |
576 | */ |
577 | ||
578 | bfd_boolean | |
243340ad | 579 | bfd_init_section_compress_status (bfd *abfd, sec_ptr sec) |
4a114e3e | 580 | { |
4a114e3e L |
581 | bfd_size_type uncompressed_size; |
582 | bfd_byte *uncompressed_buffer; | |
4a114e3e L |
583 | |
584 | /* Error if not opened for read. */ | |
585 | if (abfd->direction != read_direction | |
586 | || sec->size == 0 | |
587 | || sec->rawsize != 0 | |
588 | || sec->contents != NULL | |
589 | || sec->compress_status != COMPRESS_SECTION_NONE) | |
1b315056 | 590 | { |
4a114e3e L |
591 | bfd_set_error (bfd_error_invalid_operation); |
592 | return FALSE; | |
1b315056 | 593 | } |
1b315056 | 594 | |
4a114e3e L |
595 | /* Read in the full section contents and compress it. */ |
596 | uncompressed_size = sec->size; | |
597 | uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size); | |
e63d1232 NC |
598 | /* PR 21431 */ |
599 | if (uncompressed_buffer == NULL) | |
600 | return FALSE; | |
601 | ||
4a114e3e L |
602 | if (!bfd_get_section_contents (abfd, sec, uncompressed_buffer, |
603 | 0, uncompressed_size)) | |
e63d1232 | 604 | return FALSE; |
1b315056 | 605 | |
e63d1232 NC |
606 | uncompressed_size = bfd_compress_section_contents (abfd, sec, |
607 | uncompressed_buffer, | |
608 | uncompressed_size); | |
609 | return uncompressed_size != 0; | |
1b315056 | 610 | } |
0ce398f1 L |
611 | |
612 | /* | |
613 | FUNCTION | |
614 | bfd_compress_section | |
615 | ||
616 | SYNOPSIS | |
617 | bfd_boolean bfd_compress_section | |
618 | (bfd *abfd, asection *section, bfd_byte *uncompressed_buffer); | |
619 | ||
620 | DESCRIPTION | |
621 | If open for write, compress section, update section size with | |
622 | compressed size and set compress_status to COMPRESS_SECTION_DONE. | |
623 | ||
624 | Return @code{FALSE} if compression fail. Otherwise, return | |
625 | @code{TRUE}. | |
626 | */ | |
627 | ||
628 | bfd_boolean | |
629 | bfd_compress_section (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer) | |
630 | { | |
631 | bfd_size_type uncompressed_size = sec->size; | |
632 | ||
633 | /* Error if not opened for write. */ | |
634 | if (abfd->direction != write_direction | |
635 | || uncompressed_size == 0 | |
636 | || uncompressed_buffer == NULL | |
637 | || sec->contents != NULL | |
638 | || sec->compressed_size != 0 | |
639 | || sec->compress_status != COMPRESS_SECTION_NONE) | |
640 | { | |
641 | bfd_set_error (bfd_error_invalid_operation); | |
642 | return FALSE; | |
643 | } | |
644 | ||
645 | /* Compress it. */ | |
646 | return bfd_compress_section_contents (abfd, sec, uncompressed_buffer, | |
3e19fb8f | 647 | uncompressed_size) != 0; |
0ce398f1 | 648 | } |