1 /* Compressed section support (intended for debug sections).
2 Copyright (C) 2008-2014 Free Software Foundation, Inc.
4 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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. */
27 #include "safe-ctype.h"
31 decompress_contents (bfd_byte
*compressed_buffer
,
32 bfd_size_type compressed_size
,
33 bfd_byte
*uncompressed_buffer
,
34 bfd_size_type uncompressed_size
)
39 /* It is possible the section consists of several compressed
40 buffers concatenated together, so we uncompress in a loop. */
44 strm
.avail_in
= compressed_size
- 12;
45 strm
.next_in
= (Bytef
*) compressed_buffer
+ 12;
46 strm
.avail_out
= uncompressed_size
;
48 BFD_ASSERT (Z_OK
== 0);
49 rc
= inflateInit (&strm
);
50 while (strm
.avail_in
> 0 && strm
.avail_out
> 0)
54 strm
.next_out
= ((Bytef
*) uncompressed_buffer
55 + (uncompressed_size
- strm
.avail_out
));
56 rc
= inflate (&strm
, Z_FINISH
);
57 if (rc
!= Z_STREAM_END
)
59 rc
= inflateReset (&strm
);
61 rc
|= inflateEnd (&strm
);
62 return rc
== Z_OK
&& strm
.avail_out
== 0;
68 bfd_compress_section_contents
71 bfd_boolean bfd_compress_section_contents
72 (bfd *abfd, asection *section, bfd_byte *uncompressed_buffer,
73 bfd_size_type uncompressed_size);
77 Compress data of the size specified in @var{uncompressed_size}
78 and pointed to by @var{uncompressed_buffer} using zlib and store
79 as the contents field. This function assumes the contents
80 field was allocated using bfd_malloc() or equivalent. If zlib
81 is not installed on this machine, the input is unmodified.
83 Return @code{TRUE} if the full section contents is compressed
88 bfd_compress_section_contents (bfd
*abfd ATTRIBUTE_UNUSED
,
89 sec_ptr sec ATTRIBUTE_UNUSED
,
90 bfd_byte
*uncompressed_buffer ATTRIBUTE_UNUSED
,
91 bfd_size_type uncompressed_size ATTRIBUTE_UNUSED
)
94 bfd_set_error (bfd_error_invalid_operation
);
97 uLong compressed_size
;
98 bfd_byte
*compressed_buffer
;
100 compressed_size
= compressBound (uncompressed_size
) + 12;
101 compressed_buffer
= (bfd_byte
*) bfd_malloc (compressed_size
);
103 if (compressed_buffer
== NULL
)
106 if (compress ((Bytef
*) compressed_buffer
+ 12,
108 (const Bytef
*) uncompressed_buffer
,
109 uncompressed_size
) != Z_OK
)
111 free (compressed_buffer
);
112 bfd_set_error (bfd_error_bad_value
);
116 /* Write the zlib header. In this case, it should be "ZLIB" followed
117 by the uncompressed section size, 8 bytes in big-endian order. */
118 memcpy (compressed_buffer
, "ZLIB", 4);
119 compressed_buffer
[11] = uncompressed_size
; uncompressed_size
>>= 8;
120 compressed_buffer
[10] = uncompressed_size
; uncompressed_size
>>= 8;
121 compressed_buffer
[9] = uncompressed_size
; uncompressed_size
>>= 8;
122 compressed_buffer
[8] = uncompressed_size
; uncompressed_size
>>= 8;
123 compressed_buffer
[7] = uncompressed_size
; uncompressed_size
>>= 8;
124 compressed_buffer
[6] = uncompressed_size
; uncompressed_size
>>= 8;
125 compressed_buffer
[5] = uncompressed_size
; uncompressed_size
>>= 8;
126 compressed_buffer
[4] = uncompressed_size
;
127 compressed_size
+= 12;
129 /* Free the uncompressed contents if we compress in place. */
130 if (uncompressed_buffer
== sec
->contents
)
131 free (uncompressed_buffer
);
133 sec
->contents
= compressed_buffer
;
134 sec
->size
= compressed_size
;
135 sec
->compress_status
= COMPRESS_SECTION_DONE
;
138 #endif /* HAVE_ZLIB_H */
143 bfd_get_full_section_contents
146 bfd_boolean bfd_get_full_section_contents
147 (bfd *abfd, asection *section, bfd_byte **ptr);
150 Read all data from @var{section} in BFD @var{abfd}, decompress
151 if needed, and store in @var{*ptr}. If @var{*ptr} is NULL,
152 return @var{*ptr} with memory malloc'd by this function.
154 Return @code{TRUE} if the full section contents is retrieved
159 bfd_get_full_section_contents (bfd
*abfd
, sec_ptr sec
, bfd_byte
**ptr
)
165 bfd_size_type save_size
;
166 bfd_size_type save_rawsize
;
167 bfd_byte
*compressed_buffer
;
170 if (abfd
->direction
!= write_direction
&& sec
->rawsize
!= 0)
177 switch (sec
->compress_status
)
179 case COMPRESS_SECTION_NONE
:
180 /* PR binutils/17512: Avoid malloc or file reading errors due to
181 ridiculous section sizes. But ignore linker created objects
182 and bfds with no contents (yet). */
183 if (bfd_get_size (abfd
) > 0
184 && (sec
->flags
& SEC_LINKER_CREATED
) == 0
185 && sz
> (bfd_size_type
) bfd_get_size (abfd
))
190 p
= (bfd_byte
*) bfd_malloc (sz
);
194 if (!bfd_get_section_contents (abfd
, sec
, p
, 0, sz
))
203 case DECOMPRESS_SECTION_SIZED
:
205 bfd_set_error (bfd_error_invalid_operation
);
208 /* Read in the full compressed section contents. */
209 compressed_buffer
= (bfd_byte
*) bfd_malloc (sec
->compressed_size
);
210 if (compressed_buffer
== NULL
)
212 save_rawsize
= sec
->rawsize
;
213 save_size
= sec
->size
;
214 /* Clear rawsize, set size to compressed size and set compress_status
215 to COMPRESS_SECTION_NONE. If the compressed size is bigger than
216 the uncompressed size, bfd_get_section_contents will fail. */
218 sec
->size
= sec
->compressed_size
;
219 sec
->compress_status
= COMPRESS_SECTION_NONE
;
220 ret
= bfd_get_section_contents (abfd
, sec
, compressed_buffer
,
221 0, sec
->compressed_size
);
222 /* Restore rawsize and size. */
223 sec
->rawsize
= save_rawsize
;
224 sec
->size
= save_size
;
225 sec
->compress_status
= DECOMPRESS_SECTION_SIZED
;
227 goto fail_compressed
;
230 p
= (bfd_byte
*) bfd_malloc (sz
);
232 goto fail_compressed
;
234 if (!decompress_contents (compressed_buffer
, sec
->compressed_size
, p
, sz
))
236 bfd_set_error (bfd_error_bad_value
);
240 free (compressed_buffer
);
244 free (compressed_buffer
);
249 case COMPRESS_SECTION_DONE
:
252 p
= (bfd_byte
*) bfd_malloc (sz
);
257 memcpy (p
, sec
->contents
, sz
);
267 bfd_cache_section_contents
270 void bfd_cache_section_contents
271 (asection *sec, void *contents);
274 Stash @var(contents) so any following reads of @var(sec) do
275 not need to decompress again.
279 bfd_cache_section_contents (asection
*sec
, void *contents
)
281 if (sec
->compress_status
== DECOMPRESS_SECTION_SIZED
)
282 sec
->compress_status
= COMPRESS_SECTION_DONE
;
283 sec
->contents
= contents
;
284 sec
->flags
|= SEC_IN_MEMORY
;
290 bfd_is_section_compressed
293 bfd_boolean bfd_is_section_compressed
294 (bfd *abfd, asection *section);
297 Return @code{TRUE} if @var{section} is compressed.
301 bfd_is_section_compressed (bfd
*abfd
, sec_ptr sec
)
303 bfd_byte compressed_buffer
[12];
304 unsigned int saved
= sec
->compress_status
;
305 bfd_boolean compressed
;
307 /* Don't decompress the section. */
308 sec
->compress_status
= COMPRESS_SECTION_NONE
;
310 /* Read the zlib header. In this case, it should be "ZLIB" followed
311 by the uncompressed section size, 8 bytes in big-endian order. */
312 compressed
= (bfd_get_section_contents (abfd
, sec
, compressed_buffer
, 0, 12)
313 && CONST_STRNEQ ((char*) compressed_buffer
, "ZLIB"));
315 /* Check for the pathalogical case of a debug string section that
316 contains the string ZLIB.... as the first entry. We assume that
317 no uncompressed .debug_str section would ever be big enough to
318 have the first byte of its (big-endian) size be non-zero. */
320 && strcmp (sec
->name
, ".debug_str") == 0
321 && ISPRINT (compressed_buffer
[4]))
324 /* Restore compress_status. */
325 sec
->compress_status
= saved
;
331 bfd_init_section_decompress_status
334 bfd_boolean bfd_init_section_decompress_status
335 (bfd *abfd, asection *section);
338 Record compressed section size, update section size with
339 decompressed size and set compress_status to
340 DECOMPRESS_SECTION_SIZED.
342 Return @code{FALSE} if the section is not a valid compressed
343 section or zlib is not installed on this machine. Otherwise,
348 bfd_init_section_decompress_status (bfd
*abfd ATTRIBUTE_UNUSED
,
349 sec_ptr sec ATTRIBUTE_UNUSED
)
352 bfd_set_error (bfd_error_invalid_operation
);
355 bfd_byte compressed_buffer
[12];
356 bfd_size_type uncompressed_size
;
358 if (sec
->rawsize
!= 0
359 || sec
->contents
!= NULL
360 || sec
->compress_status
!= COMPRESS_SECTION_NONE
361 || !bfd_get_section_contents (abfd
, sec
, compressed_buffer
, 0, 12))
363 bfd_set_error (bfd_error_invalid_operation
);
367 /* Read the zlib header. In this case, it should be "ZLIB" followed
368 by the uncompressed section size, 8 bytes in big-endian order. */
369 if (! CONST_STRNEQ ((char*) compressed_buffer
, "ZLIB"))
371 bfd_set_error (bfd_error_wrong_format
);
375 uncompressed_size
= compressed_buffer
[4]; uncompressed_size
<<= 8;
376 uncompressed_size
+= compressed_buffer
[5]; uncompressed_size
<<= 8;
377 uncompressed_size
+= compressed_buffer
[6]; uncompressed_size
<<= 8;
378 uncompressed_size
+= compressed_buffer
[7]; uncompressed_size
<<= 8;
379 uncompressed_size
+= compressed_buffer
[8]; uncompressed_size
<<= 8;
380 uncompressed_size
+= compressed_buffer
[9]; uncompressed_size
<<= 8;
381 uncompressed_size
+= compressed_buffer
[10]; uncompressed_size
<<= 8;
382 uncompressed_size
+= compressed_buffer
[11];
384 sec
->compressed_size
= sec
->size
;
385 sec
->size
= uncompressed_size
;
386 sec
->compress_status
= DECOMPRESS_SECTION_SIZED
;
394 bfd_init_section_compress_status
397 bfd_boolean bfd_init_section_compress_status
398 (bfd *abfd, asection *section);
401 If open for read, compress section, update section size with
402 compressed size and set compress_status to COMPRESS_SECTION_DONE.
404 Return @code{FALSE} if the section is not a valid compressed
405 section or zlib is not installed on this machine. Otherwise,
410 bfd_init_section_compress_status (bfd
*abfd ATTRIBUTE_UNUSED
,
411 sec_ptr sec ATTRIBUTE_UNUSED
)
414 bfd_set_error (bfd_error_invalid_operation
);
417 bfd_size_type uncompressed_size
;
418 bfd_byte
*uncompressed_buffer
;
421 /* Error if not opened for read. */
422 if (abfd
->direction
!= read_direction
425 || sec
->contents
!= NULL
426 || sec
->compress_status
!= COMPRESS_SECTION_NONE
)
428 bfd_set_error (bfd_error_invalid_operation
);
432 /* Read in the full section contents and compress it. */
433 uncompressed_size
= sec
->size
;
434 uncompressed_buffer
= (bfd_byte
*) bfd_malloc (uncompressed_size
);
435 if (!bfd_get_section_contents (abfd
, sec
, uncompressed_buffer
,
436 0, uncompressed_size
))
439 ret
= bfd_compress_section_contents (abfd
, sec
,
443 free (uncompressed_buffer
);