osprey/libelf/lib/input.c

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/*
 * Copyright 2005 PathScale, Inc.  All Rights Reserved.
 */

/*
input.c - low-level input for libelf.
Copyright (C) 1995 - 2001 Michael Riepe <michael@stud.uni-hannover.de>

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.

This library 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
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

#include <private.h>

#ifndef lint
static const char rcsid[] = "@(#) $Id: input.c,v 1.1.1.1 2005/10/21 19:00:00 marcel Exp $";
#endif /* lint */

#if HAVE_MMAP
#include <sys/mman.h>
#endif /* HAVE_MMAP */

void*
_elf_read(Elf *elf, void *buffer, size_t off, size_t len) {
    void *tmp;

    elf_assert(elf);
    elf_assert(elf->e_magic == ELF_MAGIC);
    elf_assert(off >= 0 && off + len <= elf->e_size);
    if (elf->e_disabled) {
  seterr(ERROR_FDDISABLED);
    }
    else if (len) {
  off += elf->e_base;
  if (lseek(elf->e_fd, (off_t)off, SEEK_SET) != (off_t)off) {
      seterr(ERROR_IO_SEEK);
  }
  else if (!(tmp = buffer) && !(tmp = malloc(len))) {
      seterr(ERROR_IO_2BIG);
  }
  else if (read(elf->e_fd, tmp, len) != (int)len) {
      seterr(ERROR_IO_READ);
      if (tmp != buffer) {
    free(tmp);
      }
  }
  else {
      return tmp;
  }
    }
    return NULL;
}

void*
_elf_mmap(Elf *elf) {
#if HAVE_MMAP
    void *tmp;

    elf_assert(elf);
    elf_assert(elf->e_magic == ELF_MAGIC);
    elf_assert(elf->e_base == 0);
    if (elf->e_disabled) {
  seterr(ERROR_FDDISABLED);
    }
    else if (elf->e_size) {
  tmp = (void*)mmap(0, elf->e_size, PROT_READ | PROT_WRITE,
        MAP_PRIVATE, elf->e_fd, 0);
  if (tmp != (void*)-1) {
      return tmp;
  }
    }
#endif /* HAVE_MMAP */
    return NULL;
}

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