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78 lines
2.2 KiB
C
78 lines
2.2 KiB
C
/* Return size of GNU compressed section.
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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 "libdwelfP.h"
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#include "libelfP.h"
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ssize_t
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dwelf_scn_gnu_compressed_size (Elf_Scn *scn)
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{
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if (scn == NULL)
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return -1;
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GElf_Shdr shdr;
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if (gelf_getshdr (scn, &shdr) == NULL)
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return -1;
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/* Allocated or no bits sections can never be compressed. */
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if ((shdr.sh_flags & SHF_ALLOC) != 0
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|| shdr.sh_type == SHT_NULL
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|| shdr.sh_type == SHT_NOBITS)
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return -1;
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Elf_Data *d = elf_rawdata (scn, NULL);
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if (d == NULL)
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return -1;
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if (d->d_size >= 4 + 8
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&& memcmp (d->d_buf, "ZLIB", 4) == 0)
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{
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/* There is a 12-byte header of "ZLIB" followed by
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an 8-byte big-endian size. There is only one type and
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alignment isn't preserved separately. */
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uint64_t size;
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memcpy (&size, d->d_buf + 4, sizeof size);
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size = be64toh (size);
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/* One more sanity check, size should be bigger than original
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data size plus some overhead (4 chars ZLIB + 8 bytes size + 6
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bytes zlib stream overhead + 5 bytes overhead max for one 16K
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block) and should fit into a size_t. */
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if (size + 4 + 8 + 6 + 5 < d->d_size || size > SIZE_MAX)
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return -1;
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return size;
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}
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return -1;
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}
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