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/*
input.c - low-level input for libelf.
Copyright (C) 1995, 1996 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>
#if HAVE_MMAP
#include <sys/mman.h>
#endif
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, 0) != (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
return NULL;
}
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