/* Return section compression header.

   Copyright (C) 2015 Red Hat, Inc.

   This file is part of elfutils.

   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 <libelf.h>

#include "libelfP.h"

#include "common.h"

#ifndef LIBELFBITS

# define LIBELFBITS 32

#endif

ElfW2(LIBELFBITS,Chdr) *

elfw2(LIBELFBITS,getchdr) (Elf_Scn *scn)

{

  ElfW2(LIBELFBITS,Shdr) *shdr = elfw2(LIBELFBITS,getshdr) (scn);

  if (shdr == NULL)

    return NULL;

  /* Must have SHF_COMPRESSED flag set.  Allocated or no bits sections

     can never be compressed.  */

  if ((shdr->sh_flags & SHF_ALLOC) != 0)

    {

      __libelf_seterrno (ELF_E_INVALID_SECTION_FLAGS);

      return NULL;

    }

  if (shdr->sh_type == SHT_NULL

      || shdr->sh_type == SHT_NOBITS)

    {

      __libelf_seterrno (ELF_E_INVALID_SECTION_TYPE);

      return NULL;

    }

  if ((shdr->sh_flags & SHF_COMPRESSED) == 0)

    {

      __libelf_seterrno (ELF_E_NOT_COMPRESSED);

      return NULL;

    }

  /* This makes sure the data is in the correct format, so we don't

     need to swap fields. */

  Elf_Data *d  = elf_getdata (scn, NULL);

  if (d == NULL)

    return NULL;

  if (d->d_size < sizeof (ElfW2(LIBELFBITS,Chdr)) || d->d_buf == NULL)

    {

      __libelf_seterrno (ELF_E_INVALID_DATA);

      return NULL;

    }

  return (ElfW2(LIBELFBITS,Chdr) *) d->d_buf;

}

Unexecuted instantiation: elf32_getchdr

elf64_getchdr

Line

Count

Source

44

2.56k

{

45

2.56k

  ElfW2(LIBELFBITS,Shdr) *shdr = elfw2(LIBELFBITS,getshdr) (scn);

46

2.56k

  if (shdr == NULL)

47

0

    return NULL;

48

49

  /* Must have SHF_COMPRESSED flag set.  Allocated or no bits sections

50

     can never be compressed.  */

51

2.56k

  if ((shdr->sh_flags & SHF_ALLOC) != 0)

52

205

    {

53

205

      __libelf_seterrno (ELF_E_INVALID_SECTION_FLAGS);

54

205

      return NULL;

55

205

    }

56

57

2.35k

  if (shdr->sh_type == SHT_NULL

58

2.35k

      || shdr->sh_type == SHT_NOBITS)

59

0

    {

60

0

      __libelf_seterrno (ELF_E_INVALID_SECTION_TYPE);

61

0

      return NULL;

62

0

    }

63

64

2.35k

  if ((shdr->sh_flags & SHF_COMPRESSED) == 0)

65

0

    {

66

0

      __libelf_seterrno (ELF_E_NOT_COMPRESSED);

67

0

      return NULL;

68

0

    }

69

70

  /* This makes sure the data is in the correct format, so we don't

71

     need to swap fields. */

72

2.35k

  Elf_Data *d  = elf_getdata (scn, NULL);

73

2.35k

  if (d == NULL)

74

382

    return NULL;

75

76

1.97k

  if (d->d_size < sizeof (ElfW2(LIBELFBITS,Chdr)) || d->d_buf == NULL)

77

458

    {

78

458

      __libelf_seterrno (ELF_E_INVALID_DATA);

79

458

      return NULL;

80

458

    }

81

82

1.51k

  return (ElfW2(LIBELFBITS,Chdr) *) d->d_buf;

83

1.97k

}