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84 lines
2.2 KiB
84 lines
2.2 KiB
/* Return section compression header.
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Copyright (C) 2015 Red Hat, Inc.
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This file is part of elfutils.
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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 <libelf.h>
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#include "libelfP.h"
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#include "common.h"
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#ifndef LIBELFBITS
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# define LIBELFBITS 32
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#endif
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ElfW2(LIBELFBITS,Chdr) *
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elfw2(LIBELFBITS,getchdr) (Elf_Scn *scn)
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{
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ElfW2(LIBELFBITS,Shdr) *shdr = elfw2(LIBELFBITS,getshdr) (scn);
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if (shdr == NULL)
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return NULL;
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/* Must have SHF_COMPRESSED flag set. Allocated or no bits sections
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can never be compressed. */
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if ((shdr->sh_flags & SHF_ALLOC) != 0)
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{
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__libelf_seterrno (ELF_E_INVALID_SECTION_FLAGS);
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return NULL;
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}
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if (shdr->sh_type == SHT_NULL
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|| shdr->sh_type == SHT_NOBITS)
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{
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__libelf_seterrno (ELF_E_INVALID_SECTION_TYPE);
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return NULL;
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}
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if ((shdr->sh_flags & SHF_COMPRESSED) == 0)
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{
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__libelf_seterrno (ELF_E_NOT_COMPRESSED);
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return NULL;
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}
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/* This makes sure the data is in the correct format, so we don't
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need to swap fields. */
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Elf_Data *d = elf_getdata (scn, NULL);
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if (d == NULL)
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return NULL;
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if (d->d_size < sizeof (ElfW2(LIBELFBITS,Chdr)) || d->d_buf == NULL)
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{
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__libelf_seterrno (ELF_E_INVALID_DATA);
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return NULL;
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}
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return (ElfW2(LIBELFBITS,Chdr) *) d->d_buf;
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}
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