120 lines
4 KiB
C
120 lines
4 KiB
C
/* ELF attributes support (based on ARM EABI attributes).
|
|
Copyright 2008, 2010
|
|
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 "config.h"
|
|
#include "sysdep.h"
|
|
#include "bfd.h"
|
|
#include "libbfd.h"
|
|
#ifdef HAVE_ZLIB_H
|
|
#include <zlib.h>
|
|
#endif
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_uncompress_section_contents
|
|
|
|
SYNOPSIS
|
|
bfd_boolean bfd_uncompress_section_contents
|
|
(bfd_byte **buffer, bfd_size_type *size);
|
|
|
|
DESCRIPTION
|
|
|
|
Uncompresses a section that was compressed using zlib, in place. At
|
|
the call to this function, *@var{buffer} and *@var{size} should point
|
|
to the section contents to be uncompressed. At the end of the
|
|
function, *@var{buffer} and *@var{size} will point to the uncompressed
|
|
contents. This function assumes *BUFFER was allocated using
|
|
bfd_malloc() or equivalent. If the section is not a valid compressed
|
|
section, or zlib is not installed on this machine, the input is
|
|
unmodified.
|
|
|
|
Returns @code{FALSE} if unable to uncompress successfully; in that case
|
|
the input is unmodified. Otherwise, returns @code{TRUE}.
|
|
*/
|
|
|
|
bfd_boolean
|
|
bfd_uncompress_section_contents (bfd_byte **buffer ATTRIBUTE_UNUSED,
|
|
bfd_size_type *size ATTRIBUTE_UNUSED)
|
|
{
|
|
#ifndef HAVE_ZLIB_H
|
|
return FALSE;
|
|
#else
|
|
bfd_size_type compressed_size = *size;
|
|
bfd_byte *compressed_buffer = *buffer;
|
|
bfd_size_type uncompressed_size;
|
|
bfd_byte *uncompressed_buffer;
|
|
z_stream strm;
|
|
int rc;
|
|
bfd_size_type header_size = 12;
|
|
|
|
/* Read the zlib header. In this case, it should be "ZLIB" followed
|
|
by the uncompressed section size, 8 bytes in big-endian order. */
|
|
if (compressed_size < header_size
|
|
|| ! CONST_STRNEQ ((char*) compressed_buffer, "ZLIB"))
|
|
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];
|
|
|
|
/* 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 - header_size;
|
|
strm.next_in = (Bytef*) compressed_buffer + header_size;
|
|
strm.avail_out = uncompressed_size;
|
|
uncompressed_buffer = (bfd_byte *) bfd_malloc (uncompressed_size);
|
|
if (! uncompressed_buffer)
|
|
return FALSE;
|
|
|
|
rc = inflateInit (&strm);
|
|
while (strm.avail_in > 0)
|
|
{
|
|
if (rc != Z_OK)
|
|
goto fail;
|
|
strm.next_out = ((Bytef*) uncompressed_buffer
|
|
+ (uncompressed_size - strm.avail_out));
|
|
rc = inflate (&strm, Z_FINISH);
|
|
if (rc != Z_STREAM_END)
|
|
goto fail;
|
|
rc = inflateReset (&strm);
|
|
}
|
|
rc = inflateEnd (&strm);
|
|
if (rc != Z_OK
|
|
|| strm.avail_out != 0)
|
|
goto fail;
|
|
|
|
free (compressed_buffer);
|
|
*buffer = uncompressed_buffer;
|
|
*size = uncompressed_size;
|
|
return TRUE;
|
|
|
|
fail:
|
|
free (uncompressed_buffer);
|
|
return FALSE;
|
|
#endif /* HAVE_ZLIB_H */
|
|
}
|