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/* Returns the file name and crc stored in the .gnu_debuglink if found.
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Copyright (C) 2014 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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const char *
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dwelf_elf_gnu_debuglink (Elf *elf, GElf_Word *crc)
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{
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size_t shstrndx;
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if (elf_getshdrstrndx (elf, &shstrndx) < 0)
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return NULL;
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Elf_Scn *scn = NULL;
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while ((scn = elf_nextscn (elf, scn)) != NULL)
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{
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GElf_Shdr shdr_mem;
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GElf_Shdr *shdr = gelf_getshdr (scn, &shdr_mem);
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if (shdr == NULL)
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return NULL;
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const char *name = elf_strptr (elf, shstrndx, shdr->sh_name);
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if (name == NULL)
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return NULL;
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if (!strcmp (name, ".gnu_debuglink"))
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break;
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}
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if (scn == NULL)
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return NULL;
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/* Found the .gnu_debuglink section. Extract its contents. */
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Elf_Data *rawdata = elf_rawdata (scn, NULL);
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if (rawdata == NULL || rawdata->d_buf == NULL)
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return NULL;
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/* The CRC comes after the zero-terminated file name,
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(aligned up to 4 bytes) at the end of the section data. */
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if (rawdata->d_size <= sizeof *crc
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|| memchr (rawdata->d_buf, '\0', rawdata->d_size - sizeof *crc) == NULL)
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return NULL;
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Elf_Data crcdata =
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{
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.d_type = ELF_T_WORD,
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.d_buf = crc,
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.d_size = sizeof *crc,
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.d_version = EV_CURRENT,
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};
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Elf_Data conv =
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{
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.d_type = ELF_T_WORD,
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.d_buf = rawdata->d_buf + rawdata->d_size - sizeof *crc,
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.d_size = sizeof *crc,
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.d_version = EV_CURRENT,
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};
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GElf_Ehdr ehdr_mem;
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GElf_Ehdr *ehdr = gelf_getehdr (elf, &ehdr_mem);
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if (ehdr == NULL)
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return NULL;
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Elf_Data *d = gelf_xlatetom (elf, &crcdata, &conv, ehdr->e_ident[EI_DATA]);
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if (d == NULL)
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return NULL;
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assert (d == &crcdata);
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return rawdata->d_buf;
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}
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INTDEF(dwelf_elf_gnu_debuglink)
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