/* Conversion functions for versioning information.
Copyright (C) 1998, 1999, 2000, 2002, 2003, 2015 Red Hat, Inc.
This file is part of elfutils.
Written by Ulrich Drepper <drepper@redhat.com>, 1998.
This file is free software; you can redistribute it and/or modify
it under the terms of either
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at
your option) any later version
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at
your option) any later version
or both in parallel, as here.
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 copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see <http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <gelf.h>
#include "libelfP.h"
static void
elf_cvt_Verdef (void *dest, const void *src, size_t len, int encode)
{
/* We have two different record types: ElfXX_Verndef and ElfXX_Verdaux.
To recognize them we have to walk the data structure and convert
them one after the other. The ENCODE parameter specifies whether
we are encoding or decoding. When we are encoding we can immediately
use the data in the buffer; if not, we have to decode the data before
using it. */
size_t def_offset = 0;
GElf_Verdef *ddest;
GElf_Verdef *dsrc;
/* We rely on the types being all the same size. */
assert (sizeof (GElf_Verdef) == sizeof (Elf32_Verdef));
assert (sizeof (GElf_Verdaux) == sizeof (Elf32_Verdaux));
assert (sizeof (GElf_Verdef) == sizeof (Elf64_Verdef));
assert (sizeof (GElf_Verdaux) == sizeof (Elf64_Verdaux));
if (len == 0)
return;
/* Below we rely on the next field offsets to be correct, start by
copying over all data as is in case some data isn't translated.
We don't want to leave (undefined) garbage in the dest buffer. */
memmove (dest, src, len);
do
{
size_t aux_offset;
GElf_Verdaux *asrc;
/* Test for correct offset. */
if (def_offset > len || len - def_offset < sizeof (GElf_Verdef))
return;
/* Work the tree from the first record. */
ddest = (GElf_Verdef *) ((char *) dest + def_offset);
dsrc = (GElf_Verdef *) ((char *) src + def_offset);
/* Decode first if necessary. */
if (! encode)
{
ddest->vd_version = bswap_16 (dsrc->vd_version);
ddest->vd_flags = bswap_16 (dsrc->vd_flags);
ddest->vd_ndx = bswap_16 (dsrc->vd_ndx);
ddest->vd_cnt = bswap_16 (dsrc->vd_cnt);
ddest->vd_hash = bswap_32 (dsrc->vd_hash);
ddest->vd_aux = bswap_32 (dsrc->vd_aux);
ddest->vd_next = bswap_32 (dsrc->vd_next);
aux_offset = def_offset + ddest->vd_aux;
}
else
aux_offset = def_offset + dsrc->vd_aux;
/* Handle all the auxiliary records belonging to this definition. */
do
{
GElf_Verdaux *adest;
/* Test for correct offset. */
if (aux_offset > len || len - aux_offset < sizeof (GElf_Verdaux))
return;
adest = (GElf_Verdaux *) ((char *) dest + aux_offset);
asrc = (GElf_Verdaux *) ((char *) src + aux_offset);
if (encode)
aux_offset += asrc->vda_next;
adest->vda_name = bswap_32 (asrc->vda_name);
adest->vda_next = bswap_32 (asrc->vda_next);
if (! encode)
aux_offset += adest->vda_next;
}
while (asrc->vda_next != 0);
/* Encode now if necessary. */
if (encode)
{
def_offset += dsrc->vd_next;
ddest->vd_version = bswap_16 (dsrc->vd_version);
ddest->vd_flags = bswap_16 (dsrc->vd_flags);
ddest->vd_ndx = bswap_16 (dsrc->vd_ndx);
ddest->vd_cnt = bswap_16 (dsrc->vd_cnt);
ddest->vd_hash = bswap_32 (dsrc->vd_hash);
ddest->vd_aux = bswap_32 (dsrc->vd_aux);
ddest->vd_next = bswap_32 (dsrc->vd_next);
}
else
def_offset += ddest->vd_next;
}
while (dsrc->vd_next != 0);
}
static void
elf_cvt_Verneed (void *dest, const void *src, size_t len, int encode)
{
/* We have two different record types: ElfXX_Verndef and ElfXX_Verdaux.
To recognize them we have to walk the data structure and convert
them one after the other. The ENCODE parameter specifies whether
we are encoding or decoding. When we are encoding we can immediately
use the data in the buffer; if not, we have to decode the data before
using it. */
size_t need_offset = 0;
GElf_Verneed *ndest;
GElf_Verneed *nsrc;
/* We rely on the types being all the same size. */
assert (sizeof (GElf_Verneed) == sizeof (Elf32_Verneed));
assert (sizeof (GElf_Vernaux) == sizeof (Elf32_Vernaux));
assert (sizeof (GElf_Verneed) == sizeof (Elf64_Verneed));
assert (sizeof (GElf_Vernaux) == sizeof (Elf64_Vernaux));
if (len == 0)
return;
/* Below we rely on the next field offsets to be correct, start by
copying over all data as is in case some data isn't translated.
We don't want to leave (undefined) garbage in the dest buffer. */
memmove (dest, src, len);
do
{
size_t aux_offset;
GElf_Vernaux *asrc;
/* Test for correct offset. */
if (need_offset > len || len - need_offset < sizeof (GElf_Verneed))
return;
/* Work the tree from the first record. */
ndest = (GElf_Verneed *) ((char *) dest + need_offset);
nsrc = (GElf_Verneed *) ((char *) src + need_offset);
/* Decode first if necessary. */
if (! encode)
{
ndest->vn_version = bswap_16 (nsrc->vn_version);
ndest->vn_cnt = bswap_16 (nsrc->vn_cnt);
ndest->vn_file = bswap_32 (nsrc->vn_file);
ndest->vn_aux = bswap_32 (nsrc->vn_aux);
ndest->vn_next = bswap_32 (nsrc->vn_next);
aux_offset = need_offset + ndest->vn_aux;
}
else
aux_offset = need_offset + nsrc->vn_aux;
/* Handle all the auxiliary records belonging to this requirement. */
do
{
GElf_Vernaux *adest;
/* Test for correct offset. */
if (aux_offset > len || len - aux_offset < sizeof (GElf_Vernaux))
return;
adest = (GElf_Vernaux *) ((char *) dest + aux_offset);
asrc = (GElf_Vernaux *) ((char *) src + aux_offset);
if (encode)
aux_offset += asrc->vna_next;
adest->vna_hash = bswap_32 (asrc->vna_hash);
adest->vna_flags = bswap_16 (asrc->vna_flags);
adest->vna_other = bswap_16 (asrc->vna_other);
adest->vna_name = bswap_32 (asrc->vna_name);
adest->vna_next = bswap_32 (asrc->vna_next);
if (! encode)
aux_offset += adest->vna_next;
}
while (asrc->vna_next != 0);
/* Encode now if necessary. */
if (encode)
{
need_offset += nsrc->vn_next;
ndest->vn_version = bswap_16 (nsrc->vn_version);
ndest->vn_cnt = bswap_16 (nsrc->vn_cnt);
ndest->vn_file = bswap_32 (nsrc->vn_file);
ndest->vn_aux = bswap_32 (nsrc->vn_aux);
ndest->vn_next = bswap_32 (nsrc->vn_next);
}
else
need_offset += ndest->vn_next;
}
while (nsrc->vn_next != 0);
}