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https://github.com/mariusgreuel/avrdude.git
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Add support for Visual Studio 2019
This commit is contained in:
Marius Greuel
429
external/libelf/src/begin.c
vendored
Normal file
429
external/libelf/src/begin.c
vendored
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@@ -0,0 +1,429 @@
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/*
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* begin.c - implementation of the elf_begin(3) and elf_memory(3) functions.
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* Copyright (C) 1995 - 2004 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: begin.c,v 1.22 2009/11/01 13:04:19 michael Exp $";
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#endif /* lint */
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static const Elf _elf_init = INIT_ELF;
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static const char fmag[] = ARFMAG;
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static unsigned long
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getnum(const char *str, size_t len, int base, size_t *err) {
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unsigned long result = 0;
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while (len && *str == ' ') {
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str++; len--;
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}
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while (len && *str >= '0' && (*str - '0') < base) {
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result = base * result + *str++ - '0'; len--;
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}
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while (len && *str == ' ') {
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str++; len--;
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}
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if (len) {
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*err = len;
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}
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return result;
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}
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static void
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_elf_init_ar(Elf *elf) {
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struct ar_hdr *hdr;
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size_t offset;
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size_t size;
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size_t err = 0;
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elf->e_kind = ELF_K_AR;
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elf->e_idlen = SARMAG;
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elf->e_off = SARMAG;
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/* process special members */
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offset = SARMAG;
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while (!elf->e_strtab && offset + sizeof(*hdr) <= elf->e_size) {
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hdr = (struct ar_hdr*)(elf->e_data + offset);
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if (memcmp(hdr->ar_fmag, fmag, sizeof(fmag) - 1)) {
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break;
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}
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if (hdr->ar_name[0] != '/') {
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break;
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}
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size = getnum(hdr->ar_size, sizeof(hdr->ar_size), 10, &err);
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if (err || !size) {
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break;
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}
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offset += sizeof(*hdr);
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if (offset + size > elf->e_size) {
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break;
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}
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if (hdr->ar_name[1] == '/' && hdr->ar_name[2] == ' ') {
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elf->e_strtab = elf->e_data + offset;
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elf->e_strlen = size;
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break;
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}
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if (hdr->ar_name[1] != ' ') {
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break;
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}
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/*
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* Windows (.lib) archives provide two symbol tables
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* The first one is the one we want.
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*/
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if (!elf->e_symtab) {
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elf->e_symtab = elf->e_data + offset;
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elf->e_symlen = size;
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}
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offset += size + (size & 1);
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}
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}
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static Elf_Arhdr*
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_elf_arhdr(Elf *arf) {
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struct ar_hdr *hdr;
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Elf_Arhdr *arhdr;
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size_t namelen;
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size_t tmp;
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char *name;
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size_t err = 0;
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if (arf->e_off == arf->e_size) {
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/* no error! */
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return NULL;
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}
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if (arf->e_off < 0 || arf->e_off > arf->e_size) {
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seterr(ERROR_OUTSIDE);
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return NULL;
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}
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if (arf->e_off + sizeof(*hdr) > arf->e_size) {
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seterr(ERROR_TRUNC_ARHDR);
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return NULL;
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}
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elf_assert(arf->e_data != NULL);
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hdr = (struct ar_hdr*)(arf->e_data + arf->e_off);
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if (memcmp(hdr->ar_fmag, fmag, sizeof(fmag) - 1)) {
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seterr(ERROR_ARFMAG);
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return NULL;
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}
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name = hdr->ar_name;
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for (namelen = sizeof(hdr->ar_name); namelen > 0; namelen--) {
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if (name[namelen - 1] != ' ') {
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break;
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}
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}
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if (name[0] == '/') {
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if (name[1] >= '0' && name[1] <= '9') {
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if (!arf->e_strtab) {
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seterr(ERROR_ARSTRTAB);
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return NULL;
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}
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tmp = getnum(&name[1], namelen - 1, 10, &err);
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if (err) {
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seterr(ERROR_ARSPECIAL);
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return NULL;
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}
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if (tmp < 0 || tmp >= arf->e_strlen) {
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seterr(ERROR_ARSTRTAB);
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return NULL;
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}
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for (namelen = tmp; namelen < arf->e_strlen; namelen++) {
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if (arf->e_strtab[namelen] == '/') {
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break;
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}
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}
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if (namelen == arf->e_strlen) {
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seterr(ERROR_ARSTRTAB);
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return NULL;
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}
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name = arf->e_strtab + tmp;
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namelen -= tmp;
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}
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else if (namelen != 1 && !(namelen == 2 && name[1] == '/')) {
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seterr(ERROR_ARSPECIAL);
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return NULL;
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}
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}
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else if (namelen > 0 && name[namelen - 1] == '/') {
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namelen--;
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}
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/* XXX some broken software omits the trailing slash
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else {
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namelen = 0;
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}
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*/
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if (!(arhdr = (Elf_Arhdr*)malloc(sizeof(*arhdr) +
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sizeof(hdr->ar_name) + namelen + 2))) {
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seterr(ERROR_MEM_ARHDR);
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return NULL;
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}
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arhdr->ar_name = NULL;
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arhdr->ar_rawname = (char*)(arhdr + 1);
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arhdr->ar_date = getnum(hdr->ar_date, sizeof(hdr->ar_date), 10, &err);
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arhdr->ar_uid = getnum(hdr->ar_uid, sizeof(hdr->ar_uid), 10, &err);
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arhdr->ar_gid = getnum(hdr->ar_gid, sizeof(hdr->ar_gid), 10, &err);
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arhdr->ar_mode = getnum(hdr->ar_mode, sizeof(hdr->ar_mode), 8, &err);
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arhdr->ar_size = getnum(hdr->ar_size, sizeof(hdr->ar_size), 10, &err);
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if (err) {
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free(arhdr);
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seterr(ERROR_ARHDR);
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return NULL;
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}
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if (arf->e_off + sizeof(struct ar_hdr) + arhdr->ar_size > arf->e_size) {
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free(arhdr);
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seterr(ERROR_TRUNC_MEMBER);
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return NULL;
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}
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memcpy(arhdr->ar_rawname, hdr->ar_name, sizeof(hdr->ar_name));
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arhdr->ar_rawname[sizeof(hdr->ar_name)] = '\0';
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if (namelen) {
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arhdr->ar_name = arhdr->ar_rawname + sizeof(hdr->ar_name) + 1;
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memcpy(arhdr->ar_name, name, namelen);
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arhdr->ar_name[namelen] = '\0';
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}
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return arhdr;
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}
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static void
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_elf_check_type(Elf *elf, size_t size) {
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elf->e_idlen = size;
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if (size >= EI_NIDENT && !memcmp(elf->e_data, ELFMAG, SELFMAG)) {
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elf->e_kind = ELF_K_ELF;
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elf->e_idlen = EI_NIDENT;
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elf->e_class = elf->e_data[EI_CLASS];
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elf->e_encoding = elf->e_data[EI_DATA];
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elf->e_version = elf->e_data[EI_VERSION];
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}
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else if (size >= SARMAG && !memcmp(elf->e_data, ARMAG, SARMAG)) {
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_elf_init_ar(elf);
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}
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}
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Elf*
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elf_begin(int fd, Elf_Cmd cmd, Elf *ref) {
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Elf_Arhdr *arhdr = NULL;
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size_t size = 0;
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off_t off;
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Elf *elf;
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elf_assert(_elf_init.e_magic == ELF_MAGIC);
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if (_elf_version == EV_NONE) {
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seterr(ERROR_VERSION_UNSET);
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return NULL;
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}
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else if (cmd == ELF_C_NULL) {
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return NULL;
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}
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else if (cmd == ELF_C_WRITE) {
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ref = NULL;
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}
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else if (cmd != ELF_C_READ && cmd != ELF_C_RDWR) {
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seterr(ERROR_INVALID_CMD);
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return NULL;
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}
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else if (ref) {
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elf_assert(ref->e_magic == ELF_MAGIC);
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if (!ref->e_readable || (cmd == ELF_C_RDWR && !ref->e_writable)) {
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seterr(ERROR_CMDMISMATCH);
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return NULL;
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}
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if (ref->e_kind != ELF_K_AR) {
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ref->e_count++;
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return ref;
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}
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if (cmd == ELF_C_RDWR) {
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seterr(ERROR_MEMBERWRITE);
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return NULL;
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}
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if (ref->e_memory) {
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fd = ref->e_fd;
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}
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else if (fd != ref->e_fd) {
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seterr(ERROR_FDMISMATCH);
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return NULL;
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}
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if (!(arhdr = _elf_arhdr(ref))) {
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return NULL;
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}
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size = arhdr->ar_size;
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}
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else if ((off = lseek(fd, (off_t)0, SEEK_END)) == (off_t)-1
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|| (off_t)(size = off) != off) {
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seterr(ERROR_IO_GETSIZE);
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return NULL;
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}
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if (!(elf = (Elf*)malloc(sizeof(Elf)))) {
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seterr(ERROR_MEM_ELF);
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return NULL;
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}
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*elf = _elf_init;
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elf->e_fd = fd;
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elf->e_parent = ref;
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elf->e_size = elf->e_dsize = size;
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if (cmd != ELF_C_READ) {
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elf->e_writable = 1;
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}
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if (cmd != ELF_C_WRITE) {
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elf->e_readable = 1;
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}
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else {
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return elf;
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}
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if (ref) {
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size_t offset = ref->e_off + sizeof(struct ar_hdr);
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Elf *xelf;
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elf_assert(arhdr);
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elf->e_arhdr = arhdr;
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elf->e_base = ref->e_base + offset;
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/*
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* Share the archive's memory image. To avoid
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* multiple independent elf descriptors if the
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* same member is requested twice, scan the list
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* of open members for duplicates.
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*
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* I don't know how SVR4 handles this case. Don't rely on it.
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*/
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for (xelf = ref->e_members; xelf; xelf = xelf->e_link) {
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elf_assert(xelf->e_parent == ref);
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if (xelf->e_base == elf->e_base) {
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free(arhdr);
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free(elf);
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xelf->e_count++;
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return xelf;
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}
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}
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if (size == 0) {
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elf->e_data = NULL;
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}
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#if 1
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else {
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/*
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* Archive members may be misaligned. Freezing them will
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* cause libelf to allocate buffers for translated data,
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* which should be properly aligned in all cases.
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*/
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elf_assert(!ref->e_cooked);
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elf->e_data = elf->e_rawdata = ref->e_data + offset;
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}
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#else
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else if (ref->e_data == ref->e_rawdata) {
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elf_assert(!ref->e_cooked);
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/*
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* archive is frozen - freeze member, too
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*/
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elf->e_data = elf->e_rawdata = ref->e_data + offset;
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}
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else {
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elf_assert(!ref->e_memory);
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elf->e_data = ref->e_data + offset;
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/*
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* The member's memory image may have been modified if
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* the member has been processed before. Since we need the
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* original image, we have to re-read the archive file.
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* Will fail if the archive's file descriptor is disabled.
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*/
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if (!ref->e_cooked) {
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ref->e_cooked = 1;
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}
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else if (!_elf_read(ref, elf->e_data, offset, size)) {
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free(arhdr);
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free(elf);
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return NULL;
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}
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}
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#endif
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elf->e_next = offset + size + (size & 1);
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elf->e_disabled = ref->e_disabled;
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elf->e_memory = ref->e_memory;
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/* parent/child linking */
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elf->e_link = ref->e_members;
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ref->e_members = elf;
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ref->e_count++;
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/* Slowaris compatibility - do not rely on this! */
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ref->e_off = elf->e_next;
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}
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else if (size) {
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#if HAVE_MMAP
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/*
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* Using mmap on writable files will interfere with elf_update
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*/
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if (!elf->e_writable && (elf->e_data = _elf_mmap(elf))) {
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elf->e_unmap_data = 1;
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}
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else
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#endif /* HAVE_MMAP */
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if (!(elf->e_data = _elf_read(elf, NULL, 0, size))) {
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free(elf);
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return NULL;
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}
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}
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_elf_check_type(elf, size);
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return elf;
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}
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Elf*
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elf_memory(char *image, size_t size) {
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Elf *elf;
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elf_assert(_elf_init.e_magic == ELF_MAGIC);
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if (_elf_version == EV_NONE) {
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seterr(ERROR_VERSION_UNSET);
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return NULL;
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}
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else if (size == 0 || image == NULL) {
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/* TODO: set error code? */
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return NULL;
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}
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if (!(elf = (Elf*)malloc(sizeof(Elf)))) {
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seterr(ERROR_MEM_ELF);
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return NULL;
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}
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*elf = _elf_init;
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elf->e_size = elf->e_dsize = size;
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elf->e_data = elf->e_rawdata = image;
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elf->e_readable = 1;
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elf->e_disabled = 1;
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elf->e_memory = 1;
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_elf_check_type(elf, size);
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return elf;
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}
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#if __LIBELF64
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int
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gelf_getclass(Elf *elf) {
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if (elf && elf->e_kind == ELF_K_ELF && valid_class(elf->e_class)) {
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return elf->e_class;
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}
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return ELFCLASSNONE;
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}
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#endif /* __LIBELF64 */
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Block a user