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/*
getdata.c - implementation of the elf_getdata(3) function.
Copyright (C) 1995 Michael Riepe <riepe@ifwsn4.ifw.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>
static Elf_Data*
_elf32_cook_scn(Elf *elf, Elf_Scn *scn, Scn_Data *sd) {
Elf_Data src, dst;
size_t fsize, msize;
int flag = 0;
src = dst = sd->sd_data;
src.d_version = elf->e_version;
fsize = _fsize32(src.d_version, src.d_type);
elf_assert(fsize);
msize = _msize32(dst.d_version, src.d_type);
elf_assert(msize);
if (fsize != msize) {
dst.d_size = (dst.d_size / fsize) * msize;
}
elf_assert(elf->e_data);
if (elf->e_rawdata != elf->e_data && dst.d_size <= src.d_size) {
dst.d_buf = elf->e_data + scn->s_offset;
}
else if (!(dst.d_buf = malloc(dst.d_size))) {
seterr(ERROR_MEM_SCNDATA);
return NULL;
}
else {
flag |= 1;
}
if (elf->e_rawdata) {
src.d_buf = elf->e_rawdata + scn->s_offset;
}
else {
if (src.d_size <= dst.d_size) {
src.d_buf = dst.d_buf;
}
else if (!(src.d_buf = malloc(src.d_size))) {
seterr(ERROR_IO_2BIG);
goto fail;
}
else {
flag |= 2;
}
if (!_elf_read(elf, src.d_buf, scn->s_offset, src.d_size)) {
goto fail;
}
}
if (elf32_xlatetom(&dst, &src, elf->e_encoding)) {
sd->sd_memdata = (char*)dst.d_buf;
sd->sd_data = dst;
if (flag & 2) {
free(src.d_buf);
}
if (flag & 1) {
sd->sd_free_data = 1;
}
else {
elf->e_cooked = 1;
}
return (Elf_Data*)sd;
}
fail:
if (flag & 2) {
free(src.d_buf);
}
if (flag & 1) {
free(dst.d_buf);
}
return NULL;
}
Elf_Data*
elf_getdata(Elf_Scn *scn, Elf_Data *data) {
Scn_Data *sd = (Scn_Data*)data;
Elf *elf;
if (!scn) {
return NULL;
}
elf_assert(scn->s_magic == SCN_MAGIC);
if (scn->s_index == SHN_UNDEF) {
seterr(ERROR_NULLSCN);
}
else if (sd) {
if (sd->sd_scn == scn) {
/*
* sd_link allocated by elf_newdata().
*/
return (Elf_Data*)sd->sd_link;
}
seterr(ERROR_SCNDATAMISMATCH);
}
else if ((sd = scn->s_data_1)) {
elf = scn->s_elf;
elf_assert(elf);
elf_assert(elf->e_magic == ELF_MAGIC);
if (sd->sd_freeme) {
/* allocated by elf_newdata() */
return (Elf_Data*)sd;
}
else if (scn->s_type == SHT_NULL) {
seterr(ERROR_NULLSCN);
}
else if (sd->sd_memdata) {
/* already cooked */
return (Elf_Data*)sd;
}
else if (scn->s_offset < 0 || scn->s_offset > elf->e_size) {
seterr(ERROR_OUTSIDE);
}
else if (scn->s_type == SHT_NOBITS || !scn->s_size) {
/* no data to read */
return (Elf_Data*)sd;
}
else if (scn->s_offset + scn->s_size > elf->e_size) {
seterr(ERROR_TRUNC_SCN);
}
else if (elf->e_class == ELFCLASS32) {
return _elf32_cook_scn(elf, scn, sd);
}
else if (valid_class(elf->e_class)) {
seterr(ERROR_UNIMPLEMENTED);
}
else {
seterr(ERROR_UNKNOWN_CLASS);
}
}
return NULL;
}
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