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1 /* Convert from file to memory representation.
2    Copyright (C) 1998, 1999, 2000, 2002 Red Hat, Inc.
3    This file is part of Red Hat elfutils.
4    Written by Ulrich Drepper <drepper@redhat.com>, 1998.
5 
6    Red Hat elfutils is free software; you can redistribute it and/or modify
7    it under the terms of the GNU General Public License as published by the
8    Free Software Foundation; version 2 of the License.
9 
10    Red Hat elfutils is distributed in the hope that it will be useful, but
11    WITHOUT ANY WARRANTY; without even the implied warranty of
12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13    General Public License for more details.
14 
15    You should have received a copy of the GNU General Public License along
16    with Red Hat elfutils; if not, write to the Free Software Foundation,
17    Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA.
18 
19    In addition, as a special exception, Red Hat, Inc. gives You the
20    additional right to link the code of Red Hat elfutils with code licensed
21    under any Open Source Initiative certified open source license
22    (http://www.opensource.org/licenses/index.php) which requires the
23    distribution of source code with any binary distribution and to
24    distribute linked combinations of the two.  Non-GPL Code permitted under
25    this exception must only link to the code of Red Hat elfutils through
26    those well defined interfaces identified in the file named EXCEPTION
27    found in the source code files (the "Approved Interfaces").  The files
28    of Non-GPL Code may instantiate templates or use macros or inline
29    functions from the Approved Interfaces without causing the resulting
30    work to be covered by the GNU General Public License.  Only Red Hat,
31    Inc. may make changes or additions to the list of Approved Interfaces.
32    Red Hat's grant of this exception is conditioned upon your not adding
33    any new exceptions.  If you wish to add a new Approved Interface or
34    exception, please contact Red Hat.  You must obey the GNU General Public
35    License in all respects for all of the Red Hat elfutils code and other
36    code used in conjunction with Red Hat elfutils except the Non-GPL Code
37    covered by this exception.  If you modify this file, you may extend this
38    exception to your version of the file, but you are not obligated to do
39    so.  If you do not wish to provide this exception without modification,
40    you must delete this exception statement from your version and license
41    this file solely under the GPL without exception.
42 
43    Red Hat elfutils is an included package of the Open Invention Network.
44    An included package of the Open Invention Network is a package for which
45    Open Invention Network licensees cross-license their patents.  No patent
46    license is granted, either expressly or impliedly, by designation as an
47    included package.  Should you wish to participate in the Open Invention
48    Network licensing program, please visit www.openinventionnetwork.com
49    <http://www.openinventionnetwork.com>.  */
50 
51 #ifdef HAVE_CONFIG_H
52 # include <config.h>
53 #endif
54 
55 #include <assert.h>
56 #include <endian.h>
57 #include <string.h>
58 
59 #include "libelfP.h"
60 
61 #ifndef LIBELFBITS
62 # define LIBELFBITS	32
63 #endif
64 
65 
66 Elf_Data *
67 elfw2(LIBELFBITS, xlatetom) (dest, src, encode)
68      Elf_Data *dest;
69      const Elf_Data *src;
70      unsigned int encode;
71 {
72   /* First test whether the input data is really suitable for this
73      type.  This means, whether there is an integer number of records.
74      Note that for this implementation the memory and file size of the
75      data types are identical.  */
76 #if EV_NUM != 2
77   size_t recsize = __libelf_type_sizes[src->d_version - 1][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
78 #else
79   size_t recsize = __libelf_type_sizes[0][ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
80 #endif
81 
82 
83   if (src->d_size % recsize != 0)
84     {
85       __libelf_seterrno (ELF_E_INVALID_DATA);
86       return NULL;
87     }
88 
89   /* Next see whether the converted data fits in the output buffer.  */
90   if (src->d_size > dest->d_size)
91     {
92       __libelf_seterrno (ELF_E_DEST_SIZE);
93       return NULL;
94     }
95 
96   /* Test the encode parameter.  */
97   if (encode != ELFDATA2LSB && encode != ELFDATA2MSB)
98     {
99       __libelf_seterrno (ELF_E_INVALID_ENCODING);
100       return NULL;
101     }
102 
103   /* Determine the translation function to use.
104 
105      At this point we make an assumption which is valid for all
106      existing implementations so far: the memory and file sizes are
107      the same.  This has very important consequences:
108      a) The requirement that the source and destination buffer can
109 	overlap can easily be fulfilled.
110      b) We need only one function to convert from and memory to file
111 	and vice versa since the function only has to copy and/or
112 	change the byte order.
113   */
114   if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB)
115       || (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB))
116     {
117       /* We simply have to copy since the byte order is the same.  */
118       if (src->d_buf != dest->d_buf)
119 	memmove (dest->d_buf, src->d_buf, src->d_size);
120     }
121   else
122     {
123       xfct_t fctp;
124 
125       /* Get a pointer to the transformation functions.  The `#ifdef' is
126 	 a small optimization since we don't anticipate another ELF
127 	 version and so would waste "precious" code.  */
128 #if EV_NUM != 2
129       fctp = __elf_xfctstom[src->d_version - 1][dest->d_version - 1][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
130 #else
131       fctp = __elf_xfctstom[0][0][ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
132 #endif
133 
134       /* Do the real work.  */
135       (*fctp) (dest->d_buf, src->d_buf, src->d_size, 0);
136     }
137 
138   /* Now set the real destination type and length since the operation was
139      successful.  */
140   dest->d_type = src->d_type;
141   dest->d_size = src->d_size;
142 
143   return dest;
144 }
145 INTDEF(elfw2(LIBELFBITS, xlatetom))
146