Coverage Report

Created: 2025-10-10 07:01

next uncovered line (L), next uncovered region (R), next uncovered branch (B)
/src/elfutils/libelf/elf32_xlatetom.c
Line
Count
Source
1
/* Convert from file to memory representation.
2
   Copyright (C) 1998, 1999, 2000, 2002, 2012, 2015 Red Hat, Inc.
3
   This file is part of elfutils.
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   Written by Ulrich Drepper <drepper@redhat.com>, 1998.
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   This file is free software; you can redistribute it and/or modify
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   it under the terms of either
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     * the GNU Lesser General Public License as published by the Free
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       Software Foundation; either version 3 of the License, or (at
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       your option) any later version
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   or
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     * the GNU General Public License as published by the Free
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       Software Foundation; either version 2 of the License, or (at
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       your option) any later version
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   or both in parallel, as here.
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   elfutils is distributed in the hope that it will be useful, but
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   WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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   General Public License for more details.
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   You should have received copies of the GNU General Public License and
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   the GNU Lesser General Public License along with this program.  If
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   not, see <http://www.gnu.org/licenses/>.  */
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <assert.h>
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#include <string.h>
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#include "libelfP.h"
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#ifndef LIBELFBITS
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# define LIBELFBITS 32
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#endif
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Elf_Data *
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elfw2(LIBELFBITS, xlatetom) (Elf_Data *dest, const Elf_Data *src,
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           unsigned int encode)
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40
{
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40
  if (src == NULL || dest == NULL)
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0
    return NULL;
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51
40
  if (src->d_type >= ELF_T_NUM)
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0
    {
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0
      __libelf_seterrno (ELF_E_UNKNOWN_TYPE);
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0
      return NULL;
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0
    }
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57
  /* First test whether the input data is really suitable for this
58
     type.  This means, whether there is an integer number of records.
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     Note that for this implementation the memory and file size of the
60
     data types are identical.  */
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40
  size_t recsize = __libelf_type_sizes[ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
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63
64
  /* We shouldn't require integer number of records when processing
65
     notes.  Payload bytes follow the header immediately, it's not an
66
     array of records as is the case otherwise.  */
67
40
  if (src->d_type != ELF_T_NHDR && src->d_type != ELF_T_NHDR8
68
40
      && src->d_size % recsize != 0)
69
0
    {
70
0
      __libelf_seterrno (ELF_E_INVALID_DATA);
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0
      return NULL;
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0
    }
73
74
  /* Next see whether the converted data fits in the output buffer.  */
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40
  if (src->d_size > dest->d_size)
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0
    {
77
0
      __libelf_seterrno (ELF_E_DEST_SIZE);
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0
      return NULL;
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0
    }
80
81
  /* Test the encode parameter.  */
82
40
  if (encode != ELFDATA2LSB && encode != ELFDATA2MSB)
83
0
    {
84
0
      __libelf_seterrno (ELF_E_INVALID_ENCODING);
85
0
      return NULL;
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0
    }
87
88
  /* Determine the translation function to use.
89
90
     At this point we make an assumption which is valid for all
91
     existing implementations so far: the memory and file sizes are
92
     the same.  This has very important consequences:
93
     a) The requirement that the source and destination buffer can
94
  overlap can easily be fulfilled.
95
     b) We need only one function to convert from and memory to file
96
  and vice versa since the function only has to copy and/or
97
  change the byte order.
98
  */
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40
  if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB)
100
0
      || (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB))
101
34
    {
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      /* We simply have to copy since the byte order is the same.  */
103
34
      if (src->d_buf != dest->d_buf)
104
34
  memmove (dest->d_buf, src->d_buf, src->d_size);
105
34
    }
106
6
  else
107
6
    {
108
6
      xfct_t fctp;
109
6
      fctp = __elf_xfctstom[ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
110
111
      /* Do the real work.  */
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6
      (*fctp) (dest->d_buf, src->d_buf, src->d_size, 0);
113
6
    }
114
115
  /* Now set the real destination type and length since the operation was
116
     successful.  */
117
40
  dest->d_type = src->d_type;
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40
  dest->d_size = src->d_size;
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120
40
  return dest;
121
40
}
elf32_xlatetom
Line
Count
Source
47
36
{
48
36
  if (src == NULL || dest == NULL)
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0
    return NULL;
50
51
36
  if (src->d_type >= ELF_T_NUM)
52
0
    {
53
0
      __libelf_seterrno (ELF_E_UNKNOWN_TYPE);
54
0
      return NULL;
55
0
    }
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
36
  size_t recsize = __libelf_type_sizes[ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
62
63
64
  /* We shouldn't require integer number of records when processing
65
     notes.  Payload bytes follow the header immediately, it's not an
66
     array of records as is the case otherwise.  */
67
36
  if (src->d_type != ELF_T_NHDR && src->d_type != ELF_T_NHDR8
68
36
      && src->d_size % recsize != 0)
69
0
    {
70
0
      __libelf_seterrno (ELF_E_INVALID_DATA);
71
0
      return NULL;
72
0
    }
73
74
  /* Next see whether the converted data fits in the output buffer.  */
75
36
  if (src->d_size > dest->d_size)
76
0
    {
77
0
      __libelf_seterrno (ELF_E_DEST_SIZE);
78
0
      return NULL;
79
0
    }
80
81
  /* Test the encode parameter.  */
82
36
  if (encode != ELFDATA2LSB && encode != ELFDATA2MSB)
83
0
    {
84
0
      __libelf_seterrno (ELF_E_INVALID_ENCODING);
85
0
      return NULL;
86
0
    }
87
88
  /* Determine the translation function to use.
89
90
     At this point we make an assumption which is valid for all
91
     existing implementations so far: the memory and file sizes are
92
     the same.  This has very important consequences:
93
     a) The requirement that the source and destination buffer can
94
  overlap can easily be fulfilled.
95
     b) We need only one function to convert from and memory to file
96
  and vice versa since the function only has to copy and/or
97
  change the byte order.
98
  */
99
36
  if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB)
100
0
      || (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB))
101
33
    {
102
      /* We simply have to copy since the byte order is the same.  */
103
33
      if (src->d_buf != dest->d_buf)
104
33
  memmove (dest->d_buf, src->d_buf, src->d_size);
105
33
    }
106
3
  else
107
3
    {
108
3
      xfct_t fctp;
109
3
      fctp = __elf_xfctstom[ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
110
111
      /* Do the real work.  */
112
3
      (*fctp) (dest->d_buf, src->d_buf, src->d_size, 0);
113
3
    }
114
115
  /* Now set the real destination type and length since the operation was
116
     successful.  */
117
36
  dest->d_type = src->d_type;
118
36
  dest->d_size = src->d_size;
119
120
36
  return dest;
121
36
}
elf64_xlatetom
Line
Count
Source
47
4
{
48
4
  if (src == NULL || dest == NULL)
49
0
    return NULL;
50
51
4
  if (src->d_type >= ELF_T_NUM)
52
0
    {
53
0
      __libelf_seterrno (ELF_E_UNKNOWN_TYPE);
54
0
      return NULL;
55
0
    }
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
4
  size_t recsize = __libelf_type_sizes[ELFW(ELFCLASS,LIBELFBITS) - 1][src->d_type];
62
63
64
  /* We shouldn't require integer number of records when processing
65
     notes.  Payload bytes follow the header immediately, it's not an
66
     array of records as is the case otherwise.  */
67
4
  if (src->d_type != ELF_T_NHDR && src->d_type != ELF_T_NHDR8
68
4
      && src->d_size % recsize != 0)
69
0
    {
70
0
      __libelf_seterrno (ELF_E_INVALID_DATA);
71
0
      return NULL;
72
0
    }
73
74
  /* Next see whether the converted data fits in the output buffer.  */
75
4
  if (src->d_size > dest->d_size)
76
0
    {
77
0
      __libelf_seterrno (ELF_E_DEST_SIZE);
78
0
      return NULL;
79
0
    }
80
81
  /* Test the encode parameter.  */
82
4
  if (encode != ELFDATA2LSB && encode != ELFDATA2MSB)
83
0
    {
84
0
      __libelf_seterrno (ELF_E_INVALID_ENCODING);
85
0
      return NULL;
86
0
    }
87
88
  /* Determine the translation function to use.
89
90
     At this point we make an assumption which is valid for all
91
     existing implementations so far: the memory and file sizes are
92
     the same.  This has very important consequences:
93
     a) The requirement that the source and destination buffer can
94
  overlap can easily be fulfilled.
95
     b) We need only one function to convert from and memory to file
96
  and vice versa since the function only has to copy and/or
97
  change the byte order.
98
  */
99
4
  if ((BYTE_ORDER == LITTLE_ENDIAN && encode == ELFDATA2LSB)
100
0
      || (BYTE_ORDER == BIG_ENDIAN && encode == ELFDATA2MSB))
101
1
    {
102
      /* We simply have to copy since the byte order is the same.  */
103
1
      if (src->d_buf != dest->d_buf)
104
1
  memmove (dest->d_buf, src->d_buf, src->d_size);
105
1
    }
106
3
  else
107
3
    {
108
3
      xfct_t fctp;
109
3
      fctp = __elf_xfctstom[ELFW(ELFCLASS, LIBELFBITS) - 1][src->d_type];
110
111
      /* Do the real work.  */
112
3
      (*fctp) (dest->d_buf, src->d_buf, src->d_size, 0);
113
3
    }
114
115
  /* Now set the real destination type and length since the operation was
116
     successful.  */
117
4
  dest->d_type = src->d_type;
118
4
  dest->d_size = src->d_size;
119
120
4
  return dest;
121
4
}
122
INTDEF(elfw2(LIBELFBITS, xlatetom))