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/* Convert from file to memory representation.
Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
Written by Ulrich Drepper <drepper@redhat.com>, 1998.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation.
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include <endian.h>
#include <string.h>
#include "libelfP.h"
#ifndef LIBELFBITS
# define LIBELFBITS 32
#endif
Elf_Data *
elfw2(LIBELFBITS, xlatetom) (Elf_Data *dest, const Elf_Data *src,
unsigned int encode)
{
/* First test whether the input data is really suitable for this
type. This means, whether there is an integer number of records.
Note that for this implementation the memory and file size of the
data types are identical. */
#if EV_NUM != 2
size_t recsize = __libelf_type_sizes[src->d_version - 1][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
#else
size_t recsize = __libelf_type_sizes[0][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
#endif
if (src->d_size % recsize != 0)
{
__libelf_seterrno (ELF_E_INVALID_DATA);
return NULL;
}
/* Next see whether the converted data fits in the output buffer. */
if (src->d_size > dest->d_size)
{
__libelf_seterrno (ELF_E_DEST_SIZE);
return NULL;
}
/* Test the encode parameter. */
if (encode != ELFDATA2LSB && encode != ELFDATA2MSB)
{
__libelf_seterrno (ELF_E_INVALID_ENCODING);
return NULL;
}
/* Determine the translation function to use.
At this point we make an assumption which is valid for all
existing implementations so far: the memory and file sizes are
the same. This has very important consequences:
a) The requirement that the source and destination buffer can
overlap can easily be fulfilled.
b) We need only one function to convert from and memory to file
and vice versa since the function only has to copy and/or
change the byte order.
*/
if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB)
|| (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB))
{
/* We simply have to copy since the byte order is the same. */
if (src->d_buf != dest->d_buf)
memmove (dest->d_buf, src->d_buf, src->d_size);
}
else
{
xfct_t fctp;
/* Get a pointer to the transformation functions. The `#ifdef' is
a small optimization since we don't anticipate another ELF
version and so would waste "precious" code. */
#if EV_NUM != 2
fctp = __elf_xfctstom[src->d_version - 1][dest->d_version - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
#else
fctp = __elf_xfctstom[0][0][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
#endif
/* Do the real work. */
(*fctp) (dest->d_buf, src->d_buf, src->d_size, 0);
}
/* Now set the real destination type and length since the operation was
successful. */
dest->d_type = src->d_type;
dest->d_size = src->d_size;
return dest;
}
INTDEF(elfw2(LIBELFBITS, xlatetom))
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