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/*
getdata.c - implementation of the elf_getdata(3) function.
Copyright (C) 1995 - 2001 Michael Riepe
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "private.h"
#ifndef lint
static const char rcsid[]
= "@(#) $Id: getdata.c,v 1.13 2008/05/23 08:15:34 michael Exp $";
#endif /* lint */
static Elf_Data *_elf_cook_scn(Elf *elf, Elf_Scn *scn, Scn_Data *sd) {
Elf_Data dst;
Elf_Data src;
int flag = 0;
size_t dlen;
elf_assert(elf->e_data);
/*
* Prepare source
*/
src = sd->sd_data;
src.d_version = elf->e_version;
if (elf->e_rawdata) {
src.d_buf = elf->e_rawdata + scn->s_offset;
} else {
src.d_buf = elf->e_data + scn->s_offset;
}
/*
* Prepare destination (needs prepared source!)
*/
dst = sd->sd_data;
if (elf->e_class == ELFCLASS32) {
dlen = _elf32_xltsize(&src, dst.d_version, elf->e_encoding, 0);
}
#if __LIBELF64
else if (elf->e_class == ELFCLASS64) {
dlen = _elf64_xltsize(&src, dst.d_version, elf->e_encoding, 0);
}
#endif /* __LIBELF64 */
else {
elf_assert(valid_class(elf->e_class));
seterr(ERROR_UNIMPLEMENTED);
return NULL;
}
if (dlen == (size_t)-1) {
return NULL;
}
dst.d_size = dlen;
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;
}
/*
* Translate data
*/
if (_elf_xlatetom(elf, &dst, &src)) {
sd->sd_memdata = (char *)dst.d_buf;
sd->sd_data = dst;
if (!(sd->sd_free_data = flag)) {
elf->e_cooked = 1;
}
return &sd->sd_data;
}
if (flag) {
free(dst.d_buf);
}
return NULL;
}
Elf_Data *elf_getdata(Elf_Scn *scn, Elf_Data *data) {
Scn_Data *sd;
Elf *elf;
if (!scn) {
return NULL;
}
elf_assert(scn->s_magic == SCN_MAGIC);
if (scn->s_index == SHN_UNDEF) {
seterr(ERROR_NULLSCN);
} else if (data) {
for (sd = scn->s_data_1; sd; sd = sd->sd_link) {
elf_assert(sd->sd_magic == DATA_MAGIC);
elf_assert(sd->sd_scn == scn);
if (data == &sd->sd_data) {
/*
* sd_link allocated by elf_newdata().
*/
return &sd->sd_link->sd_data;
}
}
seterr(ERROR_SCNDATAMISMATCH);
} else if ((sd = scn->s_data_1)) {
elf_assert(sd->sd_magic == DATA_MAGIC);
elf_assert(sd->sd_scn == scn);
elf = scn->s_elf;
elf_assert(elf);
elf_assert(elf->e_magic == ELF_MAGIC);
if (sd->sd_freeme) {
/* allocated by elf_newdata() */
return &sd->sd_data;
} else if (scn->s_type == SHT_NULL) {
seterr(ERROR_NULLSCN);
} else if (sd->sd_memdata) {
/* already cooked */
return &sd->sd_data;
} 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 &sd->sd_data;
} else if (scn->s_offset + scn->s_size > elf->e_size) {
seterr(ERROR_TRUNC_SCN);
} else if (valid_class(elf->e_class)) {
return _elf_cook_scn(elf, scn, sd);
} else {
seterr(ERROR_UNKNOWN_CLASS);
}
}
return NULL;
}
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