107 lines
2.5 KiB
C
107 lines
2.5 KiB
C
/*
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* input.c - low-level input for libelf.
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* Copyright (C) 1995 - 2001, 2005 Michael Riepe
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include <private.h>
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#ifndef lint
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static const char rcsid[] = "@(#) $Id: input.c,v 1.11 2008/05/23 08:15:35 michael Exp $";
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#endif /* lint */
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#include <errno.h>
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#if HAVE_MMAP
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#include <sys/mman.h>
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#endif /* HAVE_MMAP */
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static int
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xread(int fd, char *buffer, size_t len) {
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size_t done = 0;
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size_t n;
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while (done < len) {
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n = read(fd, buffer + done, len - done);
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if (n == 0) {
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/* premature end of file */
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return -1;
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}
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else if (n != (size_t)-1) {
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/* some bytes read, continue */
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done += n;
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}
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else if (errno != EAGAIN && errno != EINTR) {
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/* real error */
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return -1;
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}
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}
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return 0;
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}
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void*
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_elf_read(Elf *elf, void *buffer, size_t off, size_t len) {
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void *tmp;
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elf_assert(elf);
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elf_assert(elf->e_magic == ELF_MAGIC);
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elf_assert(off >= 0 && off + len <= elf->e_size);
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if (elf->e_disabled) {
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seterr(ERROR_FDDISABLED);
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}
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else if (len) {
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off += elf->e_base;
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if (lseek(elf->e_fd, (off_t)off, SEEK_SET) != (off_t)off) {
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seterr(ERROR_IO_SEEK);
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}
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else if (!(tmp = buffer) && !(tmp = malloc(len))) {
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seterr(ERROR_IO_2BIG);
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}
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else if (xread(elf->e_fd, tmp, len)) {
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seterr(ERROR_IO_READ);
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if (tmp != buffer) {
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free(tmp);
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}
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}
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else {
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return tmp;
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}
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}
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return NULL;
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}
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void*
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_elf_mmap(Elf *elf) {
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#if HAVE_MMAP
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void *tmp;
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elf_assert(elf);
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elf_assert(elf->e_magic == ELF_MAGIC);
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elf_assert(elf->e_base == 0);
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if (elf->e_disabled) {
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seterr(ERROR_FDDISABLED);
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}
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else if (elf->e_size) {
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tmp = (void*)mmap(0, elf->e_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE, elf->e_fd, 0);
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if (tmp != (void*)-1) {
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return tmp;
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}
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}
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#endif /* HAVE_MMAP */
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return NULL;
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}
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