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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 <string.h>
      36                 :             : 
      37                 :             : #include "libelfP.h"
      38                 :             : 
      39                 :             : #ifndef LIBELFBITS
      40                 :             : # define LIBELFBITS     32
      41                 :             : #endif
      42                 :             : 
      43                 :             : 
      44                 :             : Elf_Data *
      45                 :      346046 : elfw2(LIBELFBITS, xlatetof) (Elf_Data *dest, const Elf_Data *src,
      46                 :             :                              unsigned int encode)
      47                 :             : {
      48         [ -  + ]:      346046 :   if (src == NULL || dest == NULL)
      49                 :             :     return NULL;
      50                 :             : 
      51         [ -  + ]:      346046 :   if (src->d_type >= ELF_T_NUM)
      52                 :             :     {
      53                 :           0 :       __libelf_seterrno (ELF_E_UNKNOWN_TYPE);
      54                 :           0 :       return NULL;
      55                 :             :     }
      56                 :             : 
      57                 :             :   /* First test whether the input data is really suitable for this
      58                 :             :      type.  This means, whether there is an integer number of records.
      59                 :             :      Note that for this implementation the memory and file size of the
      60                 :             :      data types are identical.  */
      61                 :      346046 :   size_t recsize = __libelf_type_sizes[ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
      62                 :             : 
      63                 :             :   /* We shouldn't require integer number of records when processing
      64                 :             :      notes.  Payload bytes follow the header immediately, it's not an
      65                 :             :      array of records as is the case otherwise.  */
      66         [ +  - ]:      346046 :   if (src->d_type != ELF_T_NHDR && src->d_type != ELF_T_NHDR8
      67         [ -  + ]:      346046 :       && src->d_size % recsize != 0)
      68                 :             :     {
      69                 :           0 :       __libelf_seterrno (ELF_E_INVALID_DATA);
      70                 :           0 :       return NULL;
      71                 :             :     }
      72                 :             : 
      73                 :             :   /* Next see whether the converted data fits in the output buffer.  */
      74         [ -  + ]:      346046 :   if (src->d_size > dest->d_size)
      75                 :             :     {
      76                 :           0 :       __libelf_seterrno (ELF_E_DEST_SIZE);
      77                 :           0 :       return NULL;
      78                 :             :     }
      79                 :             : 
      80                 :             :   /* Test the encode parameter.  */
      81         [ -  + ]:      346046 :   if (encode != ELFDATA2LSB && encode != ELFDATA2MSB)
      82                 :             :     {
      83                 :           0 :       __libelf_seterrno (ELF_E_INVALID_ENCODING);
      84                 :           0 :       return NULL;
      85                 :             :     }
      86                 :             : 
      87                 :             :   /* Determine the translation function to use.
      88                 :             : 
      89                 :             :      At this point we make an assumption which is valid for all
      90                 :             :      existing implementations so far: the memory and file sizes are
      91                 :             :      the same.  This has very important consequences:
      92                 :             :      a) The requirement that the source and destination buffer can
      93                 :             :         overlap can easily be fulfilled.
      94                 :             :      b) We need only one function to convert from and memory to file
      95                 :             :         and vice versa since the function only has to copy and/or
      96                 :             :         change the byte order.
      97                 :             :   */
      98         [ +  + ]:      346046 :   if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB)
      99                 :             :       || (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB))
     100                 :             :     {
     101                 :             :       /* We simply have to copy since the byte order is the same.  */
     102         [ +  - ]:      262160 :       if (src->d_buf != dest->d_buf)
     103                 :      262160 :         memmove (dest->d_buf, src->d_buf, src->d_size);
     104                 :             :     }
     105                 :             :   else
     106                 :             :     {
     107                 :       83886 :       xfct_t fctp;
     108                 :       83886 :       fctp = __elf_xfctstom[ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
     109                 :             : 
     110                 :             :       /* Do the real work.  */
     111                 :       83886 :       (*fctp) (dest->d_buf, src->d_buf, src->d_size, 1);
     112                 :             :     }
     113                 :             : 
     114                 :             :   /* Now set the real destination type and length since the operation was
     115                 :             :      successful.  */
     116                 :      346046 :   dest->d_type = src->d_type;
     117                 :      346046 :   dest->d_size = src->d_size;
     118                 :             : 
     119                 :      346046 :   return dest;
     120                 :             : }
     121                 :             : INTDEF(elfw2(LIBELFBITS, xlatetof))