| 1 | /* Compressed section support (intended for debug sections). |
| 2 | Copyright (C) 2008-2016 Free Software Foundation, Inc. |
| 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 | |
| 21 | #include "sysdep.h" |
| 22 | #include <zlib.h> |
| 23 | #include "bfd.h" |
| 24 | #include "libbfd.h" |
| 25 | #include "safe-ctype.h" |
| 26 | |
| 27 | #define MAX_COMPRESSION_HEADER_SIZE 24 |
| 28 | |
| 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. */ |
| 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); |
| 46 | strm.avail_in = compressed_size; |
| 47 | strm.next_in = (Bytef*) compressed_buffer; |
| 48 | strm.avail_out = uncompressed_size; |
| 49 | |
| 50 | BFD_ASSERT (Z_OK == 0); |
| 51 | rc = inflateInit (&strm); |
| 52 | while (strm.avail_in > 0 && strm.avail_out > 0) |
| 53 | { |
| 54 | if (rc != Z_OK) |
| 55 | break; |
| 56 | strm.next_out = ((Bytef*) uncompressed_buffer |
| 57 | + (uncompressed_size - strm.avail_out)); |
| 58 | rc = inflate (&strm, Z_FINISH); |
| 59 | if (rc != Z_STREAM_END) |
| 60 | break; |
| 61 | rc = inflateReset (&strm); |
| 62 | } |
| 63 | rc |= inflateEnd (&strm); |
| 64 | return rc == Z_OK && strm.avail_out == 0; |
| 65 | } |
| 66 | |
| 67 | /* Compress data of the size specified in @var{uncompressed_size} |
| 68 | and pointed to by @var{uncompressed_buffer} using zlib and store |
| 69 | as the contents field. This function assumes the contents |
| 70 | field was allocated using bfd_malloc() or equivalent. |
| 71 | |
| 72 | Return the uncompressed size if the full section contents is |
| 73 | compressed successfully. Otherwise return 0. */ |
| 74 | |
| 75 | static bfd_size_type |
| 76 | bfd_compress_section_contents (bfd *abfd, sec_ptr sec, |
| 77 | bfd_byte *uncompressed_buffer, |
| 78 | bfd_size_type uncompressed_size) |
| 79 | { |
| 80 | uLong compressed_size; |
| 81 | bfd_byte *buffer; |
| 82 | bfd_size_type buffer_size; |
| 83 | bfd_boolean decompress; |
| 84 | int zlib_size = 0; |
| 85 | int orig_compression_header_size; |
| 86 | bfd_size_type orig_uncompressed_size; |
| 87 | int header_size = bfd_get_compression_header_size (abfd, NULL); |
| 88 | bfd_boolean compressed |
| 89 | = bfd_is_section_compressed_with_header (abfd, sec, |
| 90 | &orig_compression_header_size, |
| 91 | &orig_uncompressed_size); |
| 92 | |
| 93 | /* Either ELF compression header or the 12-byte, "ZLIB" + 8-byte size, |
| 94 | overhead in .zdebug* section. */ |
| 95 | if (!header_size) |
| 96 | header_size = 12; |
| 97 | |
| 98 | if (compressed) |
| 99 | { |
| 100 | /* We shouldn't decompress unsupported compressed section. */ |
| 101 | if (orig_compression_header_size < 0) |
| 102 | abort (); |
| 103 | |
| 104 | /* Different compression schemes. Just move the compressed section |
| 105 | contents to the right position. */ |
| 106 | if (orig_compression_header_size == 0) |
| 107 | { |
| 108 | /* Convert it from .zdebug* section. Get the uncompressed |
| 109 | size first. We need to substract the 12-byte overhead in |
| 110 | .zdebug* section. Set orig_compression_header_size to |
| 111 | the 12-bye overhead. */ |
| 112 | orig_compression_header_size = 12; |
| 113 | zlib_size = uncompressed_size - 12; |
| 114 | } |
| 115 | else |
| 116 | { |
| 117 | /* Convert it to .zdebug* section. */ |
| 118 | zlib_size = uncompressed_size - orig_compression_header_size; |
| 119 | } |
| 120 | |
| 121 | /* Add the header size. */ |
| 122 | compressed_size = zlib_size + header_size; |
| 123 | } |
| 124 | else |
| 125 | compressed_size = compressBound (uncompressed_size) + header_size; |
| 126 | |
| 127 | /* Uncompress if it leads to smaller size. */ |
| 128 | if (compressed && compressed_size > orig_uncompressed_size) |
| 129 | { |
| 130 | decompress = TRUE; |
| 131 | buffer_size = orig_uncompressed_size; |
| 132 | } |
| 133 | else |
| 134 | { |
| 135 | decompress = FALSE; |
| 136 | buffer_size = compressed_size; |
| 137 | } |
| 138 | buffer = (bfd_byte *) bfd_alloc (abfd, buffer_size); |
| 139 | if (buffer == NULL) |
| 140 | return 0; |
| 141 | |
| 142 | if (compressed) |
| 143 | { |
| 144 | sec->size = orig_uncompressed_size; |
| 145 | if (decompress) |
| 146 | { |
| 147 | if (!decompress_contents (uncompressed_buffer |
| 148 | + orig_compression_header_size, |
| 149 | zlib_size, buffer, buffer_size)) |
| 150 | { |
| 151 | bfd_set_error (bfd_error_bad_value); |
| 152 | bfd_release (abfd, buffer); |
| 153 | return 0; |
| 154 | } |
| 155 | free (uncompressed_buffer); |
| 156 | sec->contents = buffer; |
| 157 | sec->compress_status = COMPRESS_SECTION_DONE; |
| 158 | return orig_uncompressed_size; |
| 159 | } |
| 160 | else |
| 161 | { |
| 162 | bfd_update_compression_header (abfd, buffer, sec); |
| 163 | memmove (buffer + header_size, |
| 164 | uncompressed_buffer + orig_compression_header_size, |
| 165 | zlib_size); |
| 166 | } |
| 167 | } |
| 168 | else |
| 169 | { |
| 170 | if (compress ((Bytef*) buffer + header_size, |
| 171 | &compressed_size, |
| 172 | (const Bytef*) uncompressed_buffer, |
| 173 | uncompressed_size) != Z_OK) |
| 174 | { |
| 175 | bfd_release (abfd, buffer); |
| 176 | bfd_set_error (bfd_error_bad_value); |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | compressed_size += header_size; |
| 181 | /* PR binutils/18087: If compression didn't make the section smaller, |
| 182 | just keep it uncompressed. */ |
| 183 | if (compressed_size < uncompressed_size) |
| 184 | bfd_update_compression_header (abfd, buffer, sec); |
| 185 | else |
| 186 | { |
| 187 | /* NOTE: There is a small memory leak here since |
| 188 | uncompressed_buffer is malloced and won't be freed. */ |
| 189 | bfd_release (abfd, buffer); |
| 190 | sec->contents = uncompressed_buffer; |
| 191 | sec->compress_status = COMPRESS_SECTION_NONE; |
| 192 | return uncompressed_size; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | free (uncompressed_buffer); |
| 197 | sec->contents = buffer; |
| 198 | sec->size = compressed_size; |
| 199 | sec->compress_status = COMPRESS_SECTION_DONE; |
| 200 | |
| 201 | return uncompressed_size; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | FUNCTION |
| 206 | bfd_get_full_section_contents |
| 207 | |
| 208 | SYNOPSIS |
| 209 | bfd_boolean bfd_get_full_section_contents |
| 210 | (bfd *abfd, asection *section, bfd_byte **ptr); |
| 211 | |
| 212 | DESCRIPTION |
| 213 | Read all data from @var{section} in BFD @var{abfd}, decompress |
| 214 | if needed, and store in @var{*ptr}. If @var{*ptr} is NULL, |
| 215 | return @var{*ptr} with memory malloc'd by this function. |
| 216 | |
| 217 | Return @code{TRUE} if the full section contents is retrieved |
| 218 | successfully. If the section has no contents then this function |
| 219 | returns @code{TRUE} but @var{*ptr} is set to NULL. |
| 220 | */ |
| 221 | |
| 222 | bfd_boolean |
| 223 | bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr) |
| 224 | { |
| 225 | bfd_size_type sz; |
| 226 | bfd_byte *p = *ptr; |
| 227 | bfd_boolean ret; |
| 228 | bfd_size_type save_size; |
| 229 | bfd_size_type save_rawsize; |
| 230 | bfd_byte *compressed_buffer; |
| 231 | unsigned int compression_header_size; |
| 232 | |
| 233 | if (abfd->direction != write_direction && sec->rawsize != 0) |
| 234 | sz = sec->rawsize; |
| 235 | else |
| 236 | sz = sec->size; |
| 237 | if (sz == 0) |
| 238 | { |
| 239 | *ptr = NULL; |
| 240 | return TRUE; |
| 241 | } |
| 242 | |
| 243 | switch (sec->compress_status) |
| 244 | { |
| 245 | case COMPRESS_SECTION_NONE: |
| 246 | if (p == NULL) |
| 247 | { |
| 248 | p = (bfd_byte *) bfd_malloc (sz); |
| 249 | if (p == NULL) |
| 250 | return FALSE; |
| 251 | } |
| 252 | |
| 253 | if (!bfd_get_section_contents (abfd, sec, p, 0, sz)) |
| 254 | { |
| 255 | if (*ptr != p) |
| 256 | free (p); |
| 257 | return FALSE; |
| 258 | } |
| 259 | *ptr = p; |
| 260 | return TRUE; |
| 261 | |
| 262 | case DECOMPRESS_SECTION_SIZED: |
| 263 | /* Read in the full compressed section contents. */ |
| 264 | compressed_buffer = (bfd_byte *) bfd_malloc (sec->compressed_size); |
| 265 | if (compressed_buffer == NULL) |
| 266 | return FALSE; |
| 267 | save_rawsize = sec->rawsize; |
| 268 | save_size = sec->size; |
| 269 | /* Clear rawsize, set size to compressed size and set compress_status |
| 270 | to COMPRESS_SECTION_NONE. If the compressed size is bigger than |
| 271 | the uncompressed size, bfd_get_section_contents will fail. */ |
| 272 | sec->rawsize = 0; |
| 273 | sec->size = sec->compressed_size; |
| 274 | sec->compress_status = COMPRESS_SECTION_NONE; |
| 275 | ret = bfd_get_section_contents (abfd, sec, compressed_buffer, |
| 276 | 0, sec->compressed_size); |
| 277 | /* Restore rawsize and size. */ |
| 278 | sec->rawsize = save_rawsize; |
| 279 | sec->size = save_size; |
| 280 | sec->compress_status = DECOMPRESS_SECTION_SIZED; |
| 281 | if (!ret) |
| 282 | goto fail_compressed; |
| 283 | |
| 284 | if (p == NULL) |
| 285 | p = (bfd_byte *) bfd_malloc (sz); |
| 286 | if (p == NULL) |
| 287 | goto fail_compressed; |
| 288 | |
| 289 | compression_header_size = bfd_get_compression_header_size (abfd, sec); |
| 290 | if (compression_header_size == 0) |
| 291 | /* Set header size to the zlib header size if it is a |
| 292 | SHF_COMPRESSED section. */ |
| 293 | compression_header_size = 12; |
| 294 | if (!decompress_contents (compressed_buffer + compression_header_size, |
| 295 | sec->compressed_size, p, sz)) |
| 296 | { |
| 297 | bfd_set_error (bfd_error_bad_value); |
| 298 | if (p != *ptr) |
| 299 | free (p); |
| 300 | fail_compressed: |
| 301 | free (compressed_buffer); |
| 302 | return FALSE; |
| 303 | } |
| 304 | |
| 305 | free (compressed_buffer); |
| 306 | *ptr = p; |
| 307 | return TRUE; |
| 308 | |
| 309 | case COMPRESS_SECTION_DONE: |
| 310 | if (sec->contents == NULL) |
| 311 | return FALSE; |
| 312 | if (p == NULL) |
| 313 | { |
| 314 | p = (bfd_byte *) bfd_malloc (sz); |
| 315 | if (p == NULL) |
| 316 | return FALSE; |
| 317 | *ptr = p; |
| 318 | } |
| 319 | /* PR 17512; file: 5bc29788. */ |
| 320 | if (p != sec->contents) |
| 321 | memcpy (p, sec->contents, sz); |
| 322 | return TRUE; |
| 323 | |
| 324 | default: |
| 325 | abort (); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | FUNCTION |
| 331 | bfd_cache_section_contents |
| 332 | |
| 333 | SYNOPSIS |
| 334 | void bfd_cache_section_contents |
| 335 | (asection *sec, void *contents); |
| 336 | |
| 337 | DESCRIPTION |
| 338 | Stash @var(contents) so any following reads of @var(sec) do |
| 339 | not need to decompress again. |
| 340 | */ |
| 341 | |
| 342 | void |
| 343 | bfd_cache_section_contents (asection *sec, void *contents) |
| 344 | { |
| 345 | if (sec->compress_status == DECOMPRESS_SECTION_SIZED) |
| 346 | sec->compress_status = COMPRESS_SECTION_DONE; |
| 347 | sec->contents = contents; |
| 348 | sec->flags |= SEC_IN_MEMORY; |
| 349 | } |
| 350 | |
| 351 | /* |
| 352 | FUNCTION |
| 353 | bfd_is_section_compressed_with_header |
| 354 | |
| 355 | SYNOPSIS |
| 356 | bfd_boolean bfd_is_section_compressed_with_header |
| 357 | (bfd *abfd, asection *section, |
| 358 | int *compression_header_size_p, |
| 359 | bfd_size_type *uncompressed_size_p); |
| 360 | |
| 361 | DESCRIPTION |
| 362 | Return @code{TRUE} if @var{section} is compressed. Compression |
| 363 | header size is returned in @var{compression_header_size_p} and |
| 364 | uncompressed size is returned in @var{uncompressed_size_p}. If |
| 365 | compression is unsupported, compression header size is returned |
| 366 | with -1 and uncompressed size is returned with 0. |
| 367 | */ |
| 368 | |
| 369 | bfd_boolean |
| 370 | bfd_is_section_compressed_with_header (bfd *abfd, sec_ptr sec, |
| 371 | int *compression_header_size_p, |
| 372 | bfd_size_type *uncompressed_size_p) |
| 373 | { |
| 374 | bfd_byte header[MAX_COMPRESSION_HEADER_SIZE]; |
| 375 | int compression_header_size; |
| 376 | int header_size; |
| 377 | unsigned int saved = sec->compress_status; |
| 378 | bfd_boolean compressed; |
| 379 | |
| 380 | compression_header_size = bfd_get_compression_header_size (abfd, sec); |
| 381 | if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE) |
| 382 | abort (); |
| 383 | header_size = compression_header_size ? compression_header_size : 12; |
| 384 | |
| 385 | /* Don't decompress the section. */ |
| 386 | sec->compress_status = COMPRESS_SECTION_NONE; |
| 387 | |
| 388 | /* Read the header. */ |
| 389 | if (bfd_get_section_contents (abfd, sec, header, 0, header_size)) |
| 390 | { |
| 391 | if (compression_header_size == 0) |
| 392 | /* In this case, it should be "ZLIB" followed by the uncompressed |
| 393 | section size, 8 bytes in big-endian order. */ |
| 394 | compressed = CONST_STRNEQ ((char*) header , "ZLIB"); |
| 395 | else |
| 396 | compressed = TRUE; |
| 397 | } |
| 398 | else |
| 399 | compressed = FALSE; |
| 400 | |
| 401 | *uncompressed_size_p = sec->size; |
| 402 | if (compressed) |
| 403 | { |
| 404 | if (compression_header_size != 0) |
| 405 | { |
| 406 | if (!bfd_check_compression_header (abfd, header, sec, |
| 407 | uncompressed_size_p)) |
| 408 | compression_header_size = -1; |
| 409 | } |
| 410 | /* Check for the pathalogical case of a debug string section that |
| 411 | contains the string ZLIB.... as the first entry. We assume that |
| 412 | no uncompressed .debug_str section would ever be big enough to |
| 413 | have the first byte of its (big-endian) size be non-zero. */ |
| 414 | else if (strcmp (sec->name, ".debug_str") == 0 |
| 415 | && ISPRINT (header[4])) |
| 416 | compressed = FALSE; |
| 417 | else |
| 418 | *uncompressed_size_p = bfd_getb64 (header + 4); |
| 419 | } |
| 420 | |
| 421 | /* Restore compress_status. */ |
| 422 | sec->compress_status = saved; |
| 423 | *compression_header_size_p = compression_header_size; |
| 424 | return compressed; |
| 425 | } |
| 426 | |
| 427 | /* |
| 428 | FUNCTION |
| 429 | bfd_is_section_compressed |
| 430 | |
| 431 | SYNOPSIS |
| 432 | bfd_boolean bfd_is_section_compressed |
| 433 | (bfd *abfd, asection *section); |
| 434 | |
| 435 | DESCRIPTION |
| 436 | Return @code{TRUE} if @var{section} is compressed. |
| 437 | */ |
| 438 | |
| 439 | bfd_boolean |
| 440 | bfd_is_section_compressed (bfd *abfd, sec_ptr sec) |
| 441 | { |
| 442 | int compression_header_size; |
| 443 | bfd_size_type uncompressed_size; |
| 444 | return (bfd_is_section_compressed_with_header (abfd, sec, |
| 445 | &compression_header_size, |
| 446 | &uncompressed_size) |
| 447 | && compression_header_size >= 0 |
| 448 | && uncompressed_size > 0); |
| 449 | } |
| 450 | |
| 451 | /* |
| 452 | FUNCTION |
| 453 | bfd_init_section_decompress_status |
| 454 | |
| 455 | SYNOPSIS |
| 456 | bfd_boolean bfd_init_section_decompress_status |
| 457 | (bfd *abfd, asection *section); |
| 458 | |
| 459 | DESCRIPTION |
| 460 | Record compressed section size, update section size with |
| 461 | decompressed size and set compress_status to |
| 462 | DECOMPRESS_SECTION_SIZED. |
| 463 | |
| 464 | Return @code{FALSE} if the section is not a valid compressed |
| 465 | section. Otherwise, return @code{TRUE}. |
| 466 | */ |
| 467 | |
| 468 | bfd_boolean |
| 469 | bfd_init_section_decompress_status (bfd *abfd, sec_ptr sec) |
| 470 | { |
| 471 | bfd_byte header[MAX_COMPRESSION_HEADER_SIZE]; |
| 472 | int compression_header_size; |
| 473 | int header_size; |
| 474 | bfd_size_type uncompressed_size; |
| 475 | |
| 476 | compression_header_size = bfd_get_compression_header_size (abfd, sec); |
| 477 | if (compression_header_size > MAX_COMPRESSION_HEADER_SIZE) |
| 478 | abort (); |
| 479 | header_size = compression_header_size ? compression_header_size : 12; |
| 480 | |
| 481 | /* Read the header. */ |
| 482 | if (sec->rawsize != 0 |
| 483 | || sec->contents != NULL |
| 484 | || sec->compress_status != COMPRESS_SECTION_NONE |
| 485 | || !bfd_get_section_contents (abfd, sec, header, 0, header_size)) |
| 486 | { |
| 487 | bfd_set_error (bfd_error_invalid_operation); |
| 488 | return FALSE; |
| 489 | } |
| 490 | |
| 491 | if (compression_header_size == 0) |
| 492 | { |
| 493 | /* In this case, it should be "ZLIB" followed by the uncompressed |
| 494 | section size, 8 bytes in big-endian order. */ |
| 495 | if (! CONST_STRNEQ ((char*) header, "ZLIB")) |
| 496 | { |
| 497 | bfd_set_error (bfd_error_wrong_format); |
| 498 | return FALSE; |
| 499 | } |
| 500 | uncompressed_size = bfd_getb64 (header + 4); |
| 501 | } |
| 502 | else if (!bfd_check_compression_header (abfd, header, sec, |
| 503 | &uncompressed_size)) |
| 504 | { |
| 505 | bfd_set_error (bfd_error_wrong_format); |
| 506 | return FALSE; |
| 507 | } |
| 508 | |
| 509 | sec->compressed_size = sec->size; |
| 510 | sec->size = uncompressed_size; |
| 511 | sec->compress_status = DECOMPRESS_SECTION_SIZED; |
| 512 | |
| 513 | return TRUE; |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | FUNCTION |
| 518 | bfd_init_section_compress_status |
| 519 | |
| 520 | SYNOPSIS |
| 521 | bfd_boolean bfd_init_section_compress_status |
| 522 | (bfd *abfd, asection *section); |
| 523 | |
| 524 | DESCRIPTION |
| 525 | If open for read, compress section, update section size with |
| 526 | compressed size and set compress_status to COMPRESS_SECTION_DONE. |
| 527 | |
| 528 | Return @code{FALSE} if the section is not a valid compressed |
| 529 | section. Otherwise, return @code{TRUE}. |
| 530 | */ |
| 531 | |
| 532 | bfd_boolean |
| 533 | bfd_init_section_compress_status (bfd *abfd, sec_ptr sec) |
| 534 | { |
| 535 | bfd_size_type uncompressed_size; |
| 536 | bfd_byte *uncompressed_buffer; |
| 537 | bfd_boolean ret; |
| 538 | |
| 539 | /* Error if not opened for read. */ |
| 540 | if (abfd->direction != read_direction |
| 541 | || sec->size == 0 |
| 542 | || sec->rawsize != 0 |
| 543 | || sec->contents != NULL |
| 544 | || sec->compress_status != COMPRESS_SECTION_NONE) |
| 545 | { |
| 546 | bfd_set_error (bfd_error_invalid_operation); |
| 547 | return FALSE; |
| 548 | } |
| 549 | |
| 550 | /* Read in the full section contents and compress it. */ |
| 551 | uncompressed_size = sec->size; |
| 552 | uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size); |
| 553 | if (!bfd_get_section_contents (abfd, sec, uncompressed_buffer, |
| 554 | 0, uncompressed_size)) |
| 555 | ret = FALSE; |
| 556 | else |
| 557 | { |
| 558 | uncompressed_size = bfd_compress_section_contents (abfd, sec, |
| 559 | uncompressed_buffer, |
| 560 | uncompressed_size); |
| 561 | ret = uncompressed_size != 0; |
| 562 | } |
| 563 | |
| 564 | return ret; |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | FUNCTION |
| 569 | bfd_compress_section |
| 570 | |
| 571 | SYNOPSIS |
| 572 | bfd_boolean bfd_compress_section |
| 573 | (bfd *abfd, asection *section, bfd_byte *uncompressed_buffer); |
| 574 | |
| 575 | DESCRIPTION |
| 576 | If open for write, compress section, update section size with |
| 577 | compressed size and set compress_status to COMPRESS_SECTION_DONE. |
| 578 | |
| 579 | Return @code{FALSE} if compression fail. Otherwise, return |
| 580 | @code{TRUE}. |
| 581 | */ |
| 582 | |
| 583 | bfd_boolean |
| 584 | bfd_compress_section (bfd *abfd, sec_ptr sec, bfd_byte *uncompressed_buffer) |
| 585 | { |
| 586 | bfd_size_type uncompressed_size = sec->size; |
| 587 | |
| 588 | /* Error if not opened for write. */ |
| 589 | if (abfd->direction != write_direction |
| 590 | || uncompressed_size == 0 |
| 591 | || uncompressed_buffer == NULL |
| 592 | || sec->contents != NULL |
| 593 | || sec->compressed_size != 0 |
| 594 | || sec->compress_status != COMPRESS_SECTION_NONE) |
| 595 | { |
| 596 | bfd_set_error (bfd_error_invalid_operation); |
| 597 | return FALSE; |
| 598 | } |
| 599 | |
| 600 | /* Compress it. */ |
| 601 | return bfd_compress_section_contents (abfd, sec, uncompressed_buffer, |
| 602 | uncompressed_size) != 0; |
| 603 | } |