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/* Convert from file to memory representation.
Copyright (C) 1998, 1999, 2000, 2002, 2012, 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/>. */
#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
/* We shouldn't require integer number of records when processing
notes. Payload bytes follow the header immediately, it's not an
array of records as is the case otherwise. */
if (src->d_type != ELF_T_NHDR
&& 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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