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75 lines
2.2 KiB
75 lines
2.2 KiB
4 months ago
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/* Conversion functions for versioning information.
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Copyright (C) 2006, 2007 Red Hat, Inc.
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This file is part of elfutils.
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Written by Ulrich Drepper <drepper@redhat.com>, 2006.
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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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#include <assert.h>
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#include <gelf.h>
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#include "libelfP.h"
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static void
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elf_cvt_gnuhash (void *dest, const void *src, size_t len, int encode)
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{
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/* The GNU hash table format on 64 bit machines mixes 32 bit and 64 bit
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words. We must detangle them here. */
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Elf32_Word *dest32 = dest;
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const Elf32_Word *src32 = src;
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/* First four control words, 32 bits. */
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for (unsigned int cnt = 0; cnt < 4; ++cnt)
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{
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if (len < 4)
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return;
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dest32[cnt] = bswap_32 (src32[cnt]);
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len -= 4;
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}
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Elf32_Word bitmask_words = encode ? src32[2] : dest32[2];
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/* Now the 64 bit words. */
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Elf64_Xword *dest64 = (Elf64_Xword *) &dest32[4];
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const Elf64_Xword *src64 = (const Elf64_Xword *) &src32[4];
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for (unsigned int cnt = 0; cnt < bitmask_words; ++cnt)
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{
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if (len < 8)
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return;
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dest64[cnt] = bswap_64 (src64[cnt]);
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len -= 8;
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}
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/* The rest are 32 bit words again. */
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src32 = (const Elf32_Word *) &src64[bitmask_words];
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dest32 = (Elf32_Word *) &dest64[bitmask_words];
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while (len >= 4)
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{
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*dest32++ = bswap_32 (*src32++);
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len -= 4;
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}
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}
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