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       1                 :            : /* Convert from memory to file representation.
       2                 :            :    Copyright (C) 1998, 1999, 2000, 2002, 2015 Red Hat, Inc.
       3                 :            :    This file is part of elfutils.
       4                 :            :    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
       5                 :            : 
       6                 :            :    This file is free software; you can redistribute it and/or modify
       7                 :            :    it under the terms of either
       8                 :            : 
       9                 :            :      * the GNU Lesser General Public License as published by the Free
      10                 :            :        Software Foundation; either version 3 of the License, or (at
      11                 :            :        your option) any later version
      12                 :            : 
      13                 :            :    or
      14                 :            : 
      15                 :            :      * the GNU General Public License as published by the Free
      16                 :            :        Software Foundation; either version 2 of the License, or (at
      17                 :            :        your option) any later version
      18                 :            : 
      19                 :            :    or both in parallel, as here.
      20                 :            : 
      21                 :            :    elfutils is distributed in the hope that it will be useful, but
      22                 :            :    WITHOUT ANY WARRANTY; without even the implied warranty of
      23                 :            :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      24                 :            :    General Public License for more details.
      25                 :            : 
      26                 :            :    You should have received copies of the GNU General Public License and
      27                 :            :    the GNU Lesser General Public License along with this program.  If
      28                 :            :    not, see <http://www.gnu.org/licenses/>.  */
      29                 :            : 
      30                 :            : #ifdef HAVE_CONFIG_H
      31                 :            : # include <config.h>
      32                 :            : #endif
      33                 :            : 
      34                 :            : #include <assert.h>
      35                 :            : #include <endian.h>
      36                 :            : #include <string.h>
      37                 :            : 
      38                 :            : #include "libelfP.h"
      39                 :            : 
      40                 :            : #ifndef LIBELFBITS
      41                 :            : # define LIBELFBITS     32
      42                 :            : #endif
      43                 :            : 
      44                 :            : 
      45                 :            : Elf_Data *
      46                 :     265773 : elfw2(LIBELFBITS, xlatetof) (Elf_Data *dest, const Elf_Data *src,
      47                 :            :                              unsigned int encode)
      48                 :            : {
      49                 :            :   /* First test whether the input data is really suitable for this
      50                 :            :      type.  This means, whether there is an integer number of records.
      51                 :            :      Note that for this implementation the memory and file size of the
      52                 :            :      data types are identical.  */
      53                 :     265773 :   size_t recsize = __libelf_type_sizes[ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
      54                 :            : 
      55         [ -  + ]:     265773 :   if (src->d_size % recsize != 0)
      56                 :            :     {
      57                 :          0 :       __libelf_seterrno (ELF_E_INVALID_DATA);
      58                 :          0 :       return NULL;
      59                 :            :     }
      60                 :            : 
      61                 :            :   /* Next see whether the converted data fits in the output buffer.  */
      62         [ -  + ]:     265773 :   if (src->d_size > dest->d_size)
      63                 :            :     {
      64                 :          0 :       __libelf_seterrno (ELF_E_DEST_SIZE);
      65                 :          0 :       return NULL;
      66                 :            :     }
      67                 :            : 
      68                 :            :   /* Test the encode parameter.  */
      69         [ -  + ]:     265773 :   if (encode != ELFDATA2LSB && encode != ELFDATA2MSB)
      70                 :            :     {
      71                 :          0 :       __libelf_seterrno (ELF_E_INVALID_ENCODING);
      72                 :          0 :       return NULL;
      73                 :            :     }
      74                 :            : 
      75                 :            :   /* Determine the translation function to use.
      76                 :            : 
      77                 :            :      At this point we make an assumption which is valid for all
      78                 :            :      existing implementations so far: the memory and file sizes are
      79                 :            :      the same.  This has very important consequences:
      80                 :            :      a) The requirement that the source and destination buffer can
      81                 :            :         overlap can easily be fulfilled.
      82                 :            :      b) We need only one function to convert from and memory to file
      83                 :            :         and vice versa since the function only has to copy and/or
      84                 :            :         change the byte order.
      85                 :            :   */
      86         [ +  + ]:     265773 :   if ((__BYTE_ORDER == __LITTLE_ENDIAN && encode == ELFDATA2LSB)
      87                 :            :       || (__BYTE_ORDER == __BIG_ENDIAN && encode == ELFDATA2MSB))
      88                 :            :     {
      89                 :            :       /* We simply have to copy since the byte order is the same.  */
      90         [ +  - ]:     223974 :       if (src->d_buf != dest->d_buf)
      91                 :     223974 :         memmove (dest->d_buf, src->d_buf, src->d_size);
      92                 :            :     }
      93                 :            :   else
      94                 :            :     {
      95                 :      41799 :       xfct_t fctp;
      96                 :      41799 :       fctp = __elf_xfctstom[ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
      97                 :            : 
      98                 :            :       /* Do the real work.  */
      99                 :      41799 :       (*fctp) (dest->d_buf, src->d_buf, src->d_size, 1);
     100                 :            :     }
     101                 :            : 
     102                 :            :   /* Now set the real destination type and length since the operation was
     103                 :            :      successful.  */
     104                 :     265773 :   dest->d_type = src->d_type;
     105                 :     265773 :   dest->d_size = src->d_size;
     106                 :            : 
     107                 :     265773 :   return dest;
     108                 :            : }
     109                 :            : INTDEF(elfw2(LIBELFBITS, xlatetof))