430 lines
12 KiB
C
430 lines
12 KiB
C
/* Compressed section support (intended for debug sections).
|
|
Copyright 2008, 2010, 2011, 2012
|
|
Free Software Foundation, Inc.
|
|
|
|
This file is part of BFD, the Binary File Descriptor library.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
|
MA 02110-1301, USA. */
|
|
|
|
#include "sysdep.h"
|
|
#include "bfd.h"
|
|
#include "libbfd.h"
|
|
#ifdef HAVE_ZLIB_H
|
|
#include <zlib.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_ZLIB_H
|
|
static bfd_boolean
|
|
decompress_contents (bfd_byte *compressed_buffer,
|
|
bfd_size_type compressed_size,
|
|
bfd_byte *uncompressed_buffer,
|
|
bfd_size_type uncompressed_size)
|
|
{
|
|
z_stream strm;
|
|
int rc;
|
|
|
|
/* It is possible the section consists of several compressed
|
|
buffers concatenated together, so we uncompress in a loop. */
|
|
strm.zalloc = NULL;
|
|
strm.zfree = NULL;
|
|
strm.opaque = NULL;
|
|
strm.avail_in = compressed_size - 12;
|
|
strm.next_in = (Bytef*) compressed_buffer + 12;
|
|
strm.avail_out = uncompressed_size;
|
|
|
|
BFD_ASSERT (Z_OK == 0);
|
|
rc = inflateInit (&strm);
|
|
while (strm.avail_in > 0 && strm.avail_out > 0)
|
|
{
|
|
if (rc != Z_OK)
|
|
break;
|
|
strm.next_out = ((Bytef*) uncompressed_buffer
|
|
+ (uncompressed_size - strm.avail_out));
|
|
rc = inflate (&strm, Z_FINISH);
|
|
if (rc != Z_STREAM_END)
|
|
break;
|
|
rc = inflateReset (&strm);
|
|
}
|
|
rc |= inflateEnd (&strm);
|
|
return rc == Z_OK && strm.avail_out == 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_compress_section_contents
|
|
|
|
SYNOPSIS
|
|
bfd_boolean bfd_compress_section_contents
|
|
(bfd *abfd, asection *section, bfd_byte *uncompressed_buffer,
|
|
bfd_size_type uncompressed_size);
|
|
|
|
DESCRIPTION
|
|
|
|
Compress data of the size specified in @var{uncompressed_size}
|
|
and pointed to by @var{uncompressed_buffer} using zlib and store
|
|
as the contents field. This function assumes the contents
|
|
field was allocated using bfd_malloc() or equivalent. If zlib
|
|
is not installed on this machine, the input is unmodified.
|
|
|
|
Return @code{TRUE} if the full section contents is compressed
|
|
successfully.
|
|
*/
|
|
|
|
bfd_boolean
|
|
bfd_compress_section_contents (bfd *abfd ATTRIBUTE_UNUSED,
|
|
sec_ptr sec ATTRIBUTE_UNUSED,
|
|
bfd_byte *uncompressed_buffer ATTRIBUTE_UNUSED,
|
|
bfd_size_type uncompressed_size ATTRIBUTE_UNUSED)
|
|
{
|
|
#ifndef HAVE_ZLIB_H
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return FALSE;
|
|
#else
|
|
uLong compressed_size;
|
|
bfd_byte *compressed_buffer;
|
|
|
|
compressed_size = compressBound (uncompressed_size) + 12;
|
|
compressed_buffer = (bfd_byte *) bfd_malloc (compressed_size);
|
|
|
|
if (compressed_buffer == NULL)
|
|
return FALSE;
|
|
|
|
if (compress ((Bytef*) compressed_buffer + 12,
|
|
&compressed_size,
|
|
(const Bytef*) uncompressed_buffer,
|
|
uncompressed_size) != Z_OK)
|
|
{
|
|
free (compressed_buffer);
|
|
bfd_set_error (bfd_error_bad_value);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Write the zlib header. In this case, it should be "ZLIB" followed
|
|
by the uncompressed section size, 8 bytes in big-endian order. */
|
|
memcpy (compressed_buffer, "ZLIB", 4);
|
|
compressed_buffer[11] = uncompressed_size; uncompressed_size >>= 8;
|
|
compressed_buffer[10] = uncompressed_size; uncompressed_size >>= 8;
|
|
compressed_buffer[9] = uncompressed_size; uncompressed_size >>= 8;
|
|
compressed_buffer[8] = uncompressed_size; uncompressed_size >>= 8;
|
|
compressed_buffer[7] = uncompressed_size; uncompressed_size >>= 8;
|
|
compressed_buffer[6] = uncompressed_size; uncompressed_size >>= 8;
|
|
compressed_buffer[5] = uncompressed_size; uncompressed_size >>= 8;
|
|
compressed_buffer[4] = uncompressed_size;
|
|
compressed_size += 12;
|
|
|
|
/* Free the uncompressed contents if we compress in place. */
|
|
if (uncompressed_buffer == sec->contents)
|
|
free (uncompressed_buffer);
|
|
|
|
sec->contents = compressed_buffer;
|
|
sec->size = compressed_size;
|
|
sec->compress_status = COMPRESS_SECTION_DONE;
|
|
|
|
return TRUE;
|
|
#endif /* HAVE_ZLIB_H */
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_get_full_section_contents
|
|
|
|
SYNOPSIS
|
|
bfd_boolean bfd_get_full_section_contents
|
|
(bfd *abfd, asection *section, bfd_byte **ptr);
|
|
|
|
DESCRIPTION
|
|
Read all data from @var{section} in BFD @var{abfd}, decompress
|
|
if needed, and store in @var{*ptr}. If @var{*ptr} is NULL,
|
|
return @var{*ptr} with memory malloc'd by this function.
|
|
|
|
Return @code{TRUE} if the full section contents is retrieved
|
|
successfully.
|
|
*/
|
|
|
|
bfd_boolean
|
|
bfd_get_full_section_contents (bfd *abfd, sec_ptr sec, bfd_byte **ptr)
|
|
{
|
|
bfd_size_type sz;
|
|
bfd_byte *p = *ptr;
|
|
#ifdef HAVE_ZLIB_H
|
|
bfd_boolean ret;
|
|
bfd_size_type save_size;
|
|
bfd_size_type save_rawsize;
|
|
bfd_byte *compressed_buffer;
|
|
#endif
|
|
|
|
if (abfd->direction != write_direction && sec->rawsize != 0)
|
|
sz = sec->rawsize;
|
|
else
|
|
sz = sec->size;
|
|
if (sz == 0)
|
|
return TRUE;
|
|
|
|
switch (sec->compress_status)
|
|
{
|
|
case COMPRESS_SECTION_NONE:
|
|
if (p == NULL)
|
|
{
|
|
p = (bfd_byte *) bfd_malloc (sz);
|
|
if (p == NULL)
|
|
return FALSE;
|
|
}
|
|
if (!bfd_get_section_contents (abfd, sec, p, 0, sz))
|
|
{
|
|
if (*ptr != p)
|
|
free (p);
|
|
return FALSE;
|
|
}
|
|
*ptr = p;
|
|
return TRUE;
|
|
|
|
case DECOMPRESS_SECTION_SIZED:
|
|
#ifndef HAVE_ZLIB_H
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return FALSE;
|
|
#else
|
|
/* Read in the full compressed section contents. */
|
|
compressed_buffer = (bfd_byte *) bfd_malloc (sec->compressed_size);
|
|
if (compressed_buffer == NULL)
|
|
return FALSE;
|
|
save_rawsize = sec->rawsize;
|
|
save_size = sec->size;
|
|
/* Clear rawsize, set size to compressed size and set compress_status
|
|
to COMPRESS_SECTION_NONE. If the compressed size is bigger than
|
|
the uncompressed size, bfd_get_section_contents will fail. */
|
|
sec->rawsize = 0;
|
|
sec->size = sec->compressed_size;
|
|
sec->compress_status = COMPRESS_SECTION_NONE;
|
|
ret = bfd_get_section_contents (abfd, sec, compressed_buffer,
|
|
0, sec->compressed_size);
|
|
/* Restore rawsize and size. */
|
|
sec->rawsize = save_rawsize;
|
|
sec->size = save_size;
|
|
sec->compress_status = DECOMPRESS_SECTION_SIZED;
|
|
if (!ret)
|
|
goto fail_compressed;
|
|
|
|
if (p == NULL)
|
|
p = (bfd_byte *) bfd_malloc (sz);
|
|
if (p == NULL)
|
|
goto fail_compressed;
|
|
|
|
if (!decompress_contents (compressed_buffer, sec->compressed_size, p, sz))
|
|
{
|
|
bfd_set_error (bfd_error_bad_value);
|
|
if (p != *ptr)
|
|
free (p);
|
|
fail_compressed:
|
|
free (compressed_buffer);
|
|
return FALSE;
|
|
}
|
|
|
|
free (compressed_buffer);
|
|
*ptr = p;
|
|
return TRUE;
|
|
#endif
|
|
|
|
case COMPRESS_SECTION_DONE:
|
|
if (p == NULL)
|
|
{
|
|
p = (bfd_byte *) bfd_malloc (sz);
|
|
if (p == NULL)
|
|
return FALSE;
|
|
*ptr = p;
|
|
}
|
|
memcpy (p, sec->contents, sz);
|
|
return TRUE;
|
|
|
|
default:
|
|
abort ();
|
|
}
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_cache_section_contents
|
|
|
|
SYNOPSIS
|
|
void bfd_cache_section_contents
|
|
(asection *sec, void *contents);
|
|
|
|
DESCRIPTION
|
|
Stash @var(contents) so any following reads of @var(sec) do
|
|
not need to decompress again.
|
|
*/
|
|
|
|
void
|
|
bfd_cache_section_contents (asection *sec, void *contents)
|
|
{
|
|
if (sec->compress_status == DECOMPRESS_SECTION_SIZED)
|
|
sec->compress_status = COMPRESS_SECTION_DONE;
|
|
sec->contents = contents;
|
|
sec->flags |= SEC_IN_MEMORY;
|
|
}
|
|
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_is_section_compressed
|
|
|
|
SYNOPSIS
|
|
bfd_boolean bfd_is_section_compressed
|
|
(bfd *abfd, asection *section);
|
|
|
|
DESCRIPTION
|
|
Return @code{TRUE} if @var{section} is compressed.
|
|
*/
|
|
|
|
bfd_boolean
|
|
bfd_is_section_compressed (bfd *abfd, sec_ptr sec)
|
|
{
|
|
bfd_byte compressed_buffer [12];
|
|
unsigned int saved = sec->compress_status;
|
|
bfd_boolean compressed;
|
|
|
|
/* Don't decompress the section. */
|
|
sec->compress_status = COMPRESS_SECTION_NONE;
|
|
|
|
/* Read the zlib header. In this case, it should be "ZLIB" followed
|
|
by the uncompressed section size, 8 bytes in big-endian order. */
|
|
compressed = (bfd_get_section_contents (abfd, sec, compressed_buffer, 0, 12)
|
|
&& CONST_STRNEQ ((char*) compressed_buffer, "ZLIB"));
|
|
|
|
/* Restore compress_status. */
|
|
sec->compress_status = saved;
|
|
return compressed;
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_init_section_decompress_status
|
|
|
|
SYNOPSIS
|
|
bfd_boolean bfd_init_section_decompress_status
|
|
(bfd *abfd, asection *section);
|
|
|
|
DESCRIPTION
|
|
Record compressed section size, update section size with
|
|
decompressed size and set compress_status to
|
|
DECOMPRESS_SECTION_SIZED.
|
|
|
|
Return @code{FALSE} if the section is not a valid compressed
|
|
section or zlib is not installed on this machine. Otherwise,
|
|
return @code{TRUE}.
|
|
*/
|
|
|
|
bfd_boolean
|
|
bfd_init_section_decompress_status (bfd *abfd ATTRIBUTE_UNUSED,
|
|
sec_ptr sec ATTRIBUTE_UNUSED)
|
|
{
|
|
#ifndef HAVE_ZLIB_H
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return FALSE;
|
|
#else
|
|
bfd_byte compressed_buffer [12];
|
|
bfd_size_type uncompressed_size;
|
|
|
|
if (sec->rawsize != 0
|
|
|| sec->contents != NULL
|
|
|| sec->compress_status != COMPRESS_SECTION_NONE
|
|
|| !bfd_get_section_contents (abfd, sec, compressed_buffer, 0, 12))
|
|
{
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read the zlib header. In this case, it should be "ZLIB" followed
|
|
by the uncompressed section size, 8 bytes in big-endian order. */
|
|
if (! CONST_STRNEQ ((char*) compressed_buffer, "ZLIB"))
|
|
{
|
|
bfd_set_error (bfd_error_wrong_format);
|
|
return FALSE;
|
|
}
|
|
|
|
uncompressed_size = compressed_buffer[4]; uncompressed_size <<= 8;
|
|
uncompressed_size += compressed_buffer[5]; uncompressed_size <<= 8;
|
|
uncompressed_size += compressed_buffer[6]; uncompressed_size <<= 8;
|
|
uncompressed_size += compressed_buffer[7]; uncompressed_size <<= 8;
|
|
uncompressed_size += compressed_buffer[8]; uncompressed_size <<= 8;
|
|
uncompressed_size += compressed_buffer[9]; uncompressed_size <<= 8;
|
|
uncompressed_size += compressed_buffer[10]; uncompressed_size <<= 8;
|
|
uncompressed_size += compressed_buffer[11];
|
|
|
|
sec->compressed_size = sec->size;
|
|
sec->size = uncompressed_size;
|
|
sec->compress_status = DECOMPRESS_SECTION_SIZED;
|
|
|
|
return TRUE;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_init_section_compress_status
|
|
|
|
SYNOPSIS
|
|
bfd_boolean bfd_init_section_compress_status
|
|
(bfd *abfd, asection *section);
|
|
|
|
DESCRIPTION
|
|
If open for read, compress section, update section size with
|
|
compressed size and set compress_status to COMPRESS_SECTION_DONE.
|
|
|
|
Return @code{FALSE} if the section is not a valid compressed
|
|
section or zlib is not installed on this machine. Otherwise,
|
|
return @code{TRUE}.
|
|
*/
|
|
|
|
bfd_boolean
|
|
bfd_init_section_compress_status (bfd *abfd ATTRIBUTE_UNUSED,
|
|
sec_ptr sec ATTRIBUTE_UNUSED)
|
|
{
|
|
#ifndef HAVE_ZLIB_H
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return FALSE;
|
|
#else
|
|
bfd_size_type uncompressed_size;
|
|
bfd_byte *uncompressed_buffer;
|
|
bfd_boolean ret;
|
|
|
|
/* Error if not opened for read. */
|
|
if (abfd->direction != read_direction
|
|
|| sec->size == 0
|
|
|| sec->rawsize != 0
|
|
|| sec->contents != NULL
|
|
|| sec->compress_status != COMPRESS_SECTION_NONE)
|
|
{
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
return FALSE;
|
|
}
|
|
|
|
/* Read in the full section contents and compress it. */
|
|
uncompressed_size = sec->size;
|
|
uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size);
|
|
if (!bfd_get_section_contents (abfd, sec, uncompressed_buffer,
|
|
0, uncompressed_size))
|
|
ret = FALSE;
|
|
else
|
|
ret = bfd_compress_section_contents (abfd, sec,
|
|
uncompressed_buffer,
|
|
uncompressed_size);
|
|
|
|
free (uncompressed_buffer);
|
|
return ret;
|
|
#endif
|
|
}
|