libelf/elf_rawdata.c

/* Return raw section content.
   Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
   This file is part of Red Hat elfutils.
   Contributed by Ulrich Drepper <drepper@redhat.com>, 1998.

   Red Hat elfutils 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; version 2 of the License.

   Red Hat elfutils 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 Red Hat elfutils; if not, write to the Free Software Foundation,
   Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.

   In addition, as a special exception, Red Hat, Inc. gives You the
   additional right to link the code of Red Hat elfutils with code licensed
   under any Open Source Initiative certified open source license
   (http://www.opensource.org/licenses/index.php) which requires the
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   this exception must only link to the code of Red Hat elfutils through
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   found in the source code files (the "Approved Interfaces").  The files
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   Red Hat's grant of this exception is conditioned upon your not adding
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   covered by this exception.  If you modify this file, you may extend this
   exception to your version of the file, but you are not obligated to do
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   this file solely under the GPL without exception.

   Red Hat elfutils is an included package of the Open Invention Network.
   An included package of the Open Invention Network is a package for which
   Open Invention Network licensees cross-license their patents.  No patent
   license is granted, either expressly or impliedly, by designation as an
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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include <stdlib.h>

#include "libelfP.h"


Elf_Data *
elf_rawdata (scn, data)
     Elf_Scn *scn;
     Elf_Data *data;
{
  if (scn == NULL || scn->elf->kind != ELF_K_ELF)
    {
      __libelf_seterrno (ELF_E_INVALID_HANDLE);
      return NULL;
    }

  /* If `data' is not NULL this means we are not addressing the initial
     data in the file.  But this also means this data is already read
     (since otherwise it is not possible to have a valid `data' pointer)
     and all the data structures are initialized as well.  In this case
     we can simply walk the list of data records.  */
  if (data != NULL
      || (scn->data_read != 0 && (scn->flags & ELF_F_FILEDATA) == 0))
    {
      /* We don't allow accessing any but the data read from the file
	 as raw.  */
      __libelf_seterrno (ELF_E_DATA_MISMATCH);
      return NULL;
    }

  /* If the data for this section was not yet initialized do it now.  */
  if (scn->data_read == 0)
    {
      /* First thing we do is to read the data from the file.  There is
	 always a file (or memory region) associated with this descriptor
	 since otherwise the `data_read' flag would be set.  */
      if (__libelf_set_rawdata (scn) != 0)
	/* Something went wrong.  The error value is already set.  */
	return NULL;
    }

  /* Return the first data element in the list.  */
  return &scn->rawdata.d;
}
INTDEF(elf_rawdata)