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/*
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* Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of the License "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:
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*
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <elfdefs.h>
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#include <sys/stat.h>
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#if defined(__MSVCDOTNET__) || defined(__TOOLS2__)
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#include <iostream>
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#include <iomanip>
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using namespace std;
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#else //(!__MSVCDOTNET__ && !__TOOLS2__)
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#include <iostream.h>
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#include <iomanip.h>
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#endif //__MSVCDOTNET__
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#define ADDR(rtype, p, o) (rtype *)(((char *)p) + o)
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bool ignoreSomeSections;
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void hexdump(unsigned char* data, int aSize, int offset)
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// print hex dump of relevant sections
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{
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int i=0;
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int p=0;
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while (i<aSize)
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{
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int count=0;
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if(p==0){printf("\t%06x ",offset);} // offset into section
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while (i<aSize && count<4)
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{
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printf("%02X", *data); // print 4 lots of %08x for the data expresed as 32-bit word
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data++;
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i++;
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count++;
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offset++;
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}
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printf(" ");
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p++;
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if (p==4)
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{
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data=data-16;
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for (int i=0;i<16;i++) //print 16 bytes of memory interpreted
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{ //as ASCII characters with all non-printing
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if (*data>32 && *data <127) //characters converted to dots
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{
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printf("%1c",*data);
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}
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else
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{
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printf(".");
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}
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data++;
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}
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p=0;
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printf(" \n ");
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}
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}
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printf(" \n\n ");
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}
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void print_directive(unsigned char* data, int size)
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// print formatted text of directive section
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{
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printf ("\t");
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for (int i=0; i<size; i++)
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{
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if ((char)data[i]>31 && (char)data[i]<127)
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{
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printf ("%c", (char)data[i]);
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}
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if ((char)data[i]=='\n')
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{
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printf ("\n\t");
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}
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}
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printf ("\n");
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}
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void print_reloc(Elf32_Ehdr* eh, Elf32_Sym* symT, unsigned char* strtab)
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// print relocation section
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{
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Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);
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for (int j=0;j< eh->e_shnum;j++)
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{
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char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);
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if ( (shdr[j].sh_type==9) &&
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( (!ignoreSomeSections) ||
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(strncmp(".rel.debug_", &sname[shdr[j].sh_name], 11))
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)
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)
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{
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unsigned char* data = ADDR(unsigned char, eh, shdr[j].sh_offset);
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int noOfReloc=shdr[j].sh_size / shdr[j].sh_entsize;
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printf("\n\n\n\t\t\t%s\n", &sname[shdr[j].sh_name]);
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Elf32_Rel* rl=(Elf32_Rel*)data; // pointer to relocation section
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for (int i=0;i<noOfReloc;i++)
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{
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unsigned char* symbolName = strtab; // pointer to firest element of string // table which holds symbol names
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Elf32_Sym* sym = symT; // pointer to symbol table
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int symTIndx= ELF32_R_SYM(rl->r_info); // symbol Tableindex
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sym=sym+symTIndx;
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symbolName=symbolName+sym->st_name; // index into string table section
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// with symbol names
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printf("\t0x%08x \t", rl->r_offset); // prints offset into relocation section
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printf("%d", symTIndx); // symbol table index
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printf("\t%s\n",symbolName); // symbol name
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rl++;
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}
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}
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}
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}
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void print_GlSymbols(Elf32_Ehdr* eh, Elf32_Sym* symT, unsigned char* strtab)
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// print global symbols from Symbol Table
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{
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Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);
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char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);
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for (int i=0;i< eh->e_shnum;i++)
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{
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if (!strcmp(".symtab", &sname[shdr[i].sh_name]))
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{
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int noOfSym=shdr[i].sh_size / shdr[i].sh_entsize; // number of symbols
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const char *symName =(const char *)strtab;
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int count = 1;
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printf("Global symbols:\n");
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printf("=================\n\n");
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for (int l=0;l< noOfSym ;l++)
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{
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symT=symT+1;
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if( ELF32_ST_BIND(symT->st_info) == 1) // searching for global symbols
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{
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symName = symName + symT->st_name; // index into string table section
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printf("%d ",count);
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printf(symName);
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printf("\n");
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symName = symName - symT->st_name; // back to pointing to first byte of string table
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count++;
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}
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}
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}
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}
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}
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void print_elf_header(Elf32_Ehdr* eh)
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{
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// print elf header
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if (eh->e_version==1)
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printf("\tHeader version: EV_CURRENT (Current version)\n");
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else
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printf("\tInvalid version: EV_NONE (Invalid version)\n");
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if (eh->e_type==0)
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printf("\tFile Type: ET_NONE (No file type) (0)\n");
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else if (eh->e_type==1)
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printf("\tFile Type: ET_REL (Relocatable object) (1)\n");
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else if (eh->e_type==2)
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printf("\tFile Type: ET_EXEC (Executable file) (2)\n");
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else if (eh->e_type==3)
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printf("\tFile Type: ET_DYN (Shared object file) (3)\n");
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else if (eh->e_type==4)
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printf("\tFile Type: ET_CORE (Core File) (4)\n");
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else if (eh->e_type==65280)
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printf("\tFile Type: ET_LOPROC (Precessor Specific) (ff00)\n");
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else
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printf("\tFile Type: ET_HIPROC (Precessor Specific) (ffff)\n");
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if (eh->e_machine==40)
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printf("\tMachine: EM_ARM (ARM)\n");
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else
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printf("\tERROR:\tUnexpected machine\n");
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printf("\tEntry offset (in SHF_ENTRYSECT section):0x%08x \n",eh->e_entry);
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printf("\tProgram header entries : %d\n",eh->e_phnum);
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printf("\tSection header entries : %d\n",eh->e_shnum);
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printf("\tProgram header offset : %d",eh->e_phoff);
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printf(" bytes (0x%08X",eh->e_phoff);
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printf(")\n");
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printf("\tSection header offset : %d",eh->e_shoff);
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printf(" bytes (0x%08X",eh->e_shoff);
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printf(")\n");
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printf("\tProgram header entry size : %d",eh->e_phentsize);
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printf(" bytes (0x%02X",eh->e_phentsize);
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printf(")\n");
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printf("\tSection header entry size : %d",eh->e_shentsize);
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printf(" bytes (0x%02X",eh->e_shentsize);
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printf(")\n");
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printf("\tSection header string table index: %d \n", eh->e_shstrndx);
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printf("\tHeader size: %d", eh->e_ehsize);
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printf(" bytes (0x%02X",eh->e_ehsize);
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printf(")\n");
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}
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void print_sect_header(char* sname, Elf32_Shdr* shdr, int count)
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// print section header names
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{
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static const char* KtypeName[]={"0","SHT_PROGBITS (1)","SHT_SYMTAB (2)","SHT_STRTAB (3)",
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"SHT_RELA (4)","5", "SHT_DINAMIC (6)","7","8","SHT_REL (9)",
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"10","SHT_DINSYM (11)"};
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printf("\n\n\tName\t\t:%1s\n ",&sname[shdr[count].sh_name]);
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printf("\tType\t\t: %s\n", KtypeName[shdr[count].sh_type]);
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printf("\tAddr\t\t: 0x%08X\n",shdr[count].sh_addr);
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printf("\tSize\t\t: %1d", shdr[count].sh_size);
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printf(" bytes (0x%X",shdr[count].sh_size);
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printf(")\n");
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printf("\tEntry Size\t: %1d\n",shdr[count].sh_entsize);
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printf("\tAligment\t: %1d\n\n\n",shdr[count].sh_addralign);
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}
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unsigned char* findSymbolStringT(Elf32_Ehdr* eh)
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//calculate and return pointer to the first byte of string table(the one with symbol names)
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{
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Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);
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char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);
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for (int i=0;i < eh->e_shnum; i++)
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{
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if (!strcmp(".strtab", &sname[shdr[i].sh_name]))
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{
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unsigned char* data = ADDR(unsigned char, eh, shdr[i].sh_offset);
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return data; //pointer to the first byte of string table section
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}
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}
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return NULL; //if not found
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}
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Elf32_Sym* findSymbolT(Elf32_Ehdr* eh)
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//calculate and return pointer to the first element of symbol table
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{
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Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);
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for (int i=0;i < eh->e_shnum;i++)
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{
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if (shdr[i].sh_type==2)
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{
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unsigned char* data = ADDR(unsigned char, eh, shdr[i].sh_offset);
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Elf32_Sym* sym=(Elf32_Sym*)data;
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return sym; //pointer to the first element of symbol table.
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}
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}
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return NULL; // if not found
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}
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void print_Summary(Elf32_Ehdr* eh)
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{
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//print section names
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Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);
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char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);
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printf("\nSummary: \n");
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printf("==========\n");
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for (int i=0;i< eh->e_shnum;i++)
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{
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printf(&sname[shdr[i].sh_name]);
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printf("\n");
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}
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}
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bool printAll;
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int do_elf_file(char* buffer, char* name)
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{
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Elf32_Ehdr* eh=(Elf32_Ehdr *)buffer; //elf header
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if (eh->e_ident[EI_MAG0] !=0x7f || eh->e_ident[EI_MAG1] != 0x45 || eh->e_ident[EI_MAG2] !=0x4c || eh->e_ident[EI_MAG3] != 0x46)
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{
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// EI_MAG0 to EI_MAG3 - A files' first 4 bytes hold a 'magic number', identifying the file as an ELF object file.
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cout << "Error: " << name << " is not a valid ELF file";
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return 1;
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}
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if (eh->e_ident[EI_DATA] == 2)
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{
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// ELF Header size should be 52 bytes or converted into Big-Endian system 13312
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if (eh->e_ehsize != 13312)
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{
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printf("\tERROR:\tELF Header contains invalid file type\n");
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exit(1);
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}
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// e_ident[EI_DATA] specifies the data encoding of the processor-specific data in the object file.
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printf("\tERROR:\tData encoding ELFDATA2MSB (Big-Endian) not supported\n");
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exit(1);
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}
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if (eh->e_ehsize != 52)
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{
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// ELF Header size should be 52 bytes
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printf("\tERROR:\tELF Header contains invalid file type\n");
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exit(1);
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}
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int shoff = eh->e_shoff; // offset of section header table
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Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, shoff); // calculating pointer to Secton Header Table
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// Elf32_Shdr * shdr = (Elf32_Shdr *)(buffer+shoff);
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int shnum = eh->e_shnum; // number of section headers
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int shstrndx = eh->e_shstrndx;
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int snameoffset = shdr[shstrndx].sh_offset; // offset in file of sections' names
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char* sname = ADDR(char, eh, snameoffset); // pointer to String Table which holds section names
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// char * sname = (char *)(buffer+snameoffset);
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print_elf_header(eh); // print Elf Header
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Elf32_Sym* symT= findSymbolT(eh); // pointer to Symbol table
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if (symT==NULL)
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{
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printf("\nSymbol table not found\n");
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}
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unsigned char* strtab=findSymbolStringT(eh); // pointer to String table which holds symbol names
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if (strtab==NULL)
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{
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printf("\nString (the one which holds symbol names) table not found\n");
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}
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print_reloc(eh,symT, strtab); // print relocation info showing symbol names and
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// and the name of section in which the relocaton occurs.
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for(int i = 0; i < shnum; i++)
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{
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unsigned char* data = ADDR(unsigned char, eh, shdr[i].sh_offset); //pointer to the first byte in the section
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//unsigned char * data = (unsigned char * )(buffer+shdr[i].sh_offset);
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int size = shdr[i].sh_size; // section size in bytes
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//print directive section
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if (!strcmp(".directive", &sname[shdr[i].sh_name]))
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{
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print_sect_header(sname, shdr, i);
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print_directive(data,size);
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}
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if (!strcmp(".symtab", &sname[shdr[i].sh_name]))
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{
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print_sect_header(sname, shdr, i);
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// print global symbols
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print_GlSymbols(eh,symT, strtab);
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}
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//print relevant section header names
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//print hex dump of relevant sections
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if (shdr[i].sh_type==1 || shdr[i].sh_type==4 || shdr[i].sh_type==6 ||
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shdr[i].sh_type==9 || shdr[i].sh_type==11)
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{
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if (strcmp(".comment", &sname[shdr[i].sh_name])&&
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strcmp(".line", &sname[shdr[i].sh_name]) &&
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strcmp(".hash", &sname[shdr[i].sh_name]) &&
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strcmp(".note", &sname[shdr[i].sh_name]) &&
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strcmp(".directive", &sname[shdr[i].sh_name]) &&
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strncmp(".debug",&sname[shdr[i].sh_name] ,6))
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{
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if ( ! ( (ignoreSomeSections) &&
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(strncmp(".rel.debug_", &sname[shdr[i].sh_name], 11)==0)
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)
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)
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{
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print_sect_header(sname, shdr, i);
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hexdump(data,size,i);
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}
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}
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372 |
}
|
|
373 |
if (printAll) // displays extra information
|
|
374 |
{
|
|
375 |
if(i!=0)
|
|
376 |
{
|
|
377 |
print_sect_header(sname, shdr, i);
|
|
378 |
hexdump(data,size,i);
|
|
379 |
}
|
|
380 |
}
|
|
381 |
}
|
|
382 |
print_Summary(eh); // print section names
|
|
383 |
return 0;
|
|
384 |
}
|
|
385 |
|
|
386 |
int read_ar_element_header(char* ptr)
|
|
387 |
{
|
|
388 |
int length = strtol(ptr+48,0,10);
|
|
389 |
|
|
390 |
if (strncmp(ptr+58, "\x60\x0A", 2) != 0)
|
|
391 |
{
|
|
392 |
return -1;
|
|
393 |
}
|
|
394 |
return length;
|
|
395 |
}
|
|
396 |
|
|
397 |
int main(int argc, char* argv[])
|
|
398 |
{
|
|
399 |
char* arg;
|
|
400 |
int numberOfOptions=2;
|
|
401 |
printAll=0;
|
|
402 |
ignoreSomeSections=0;
|
|
403 |
if (argc<2)
|
|
404 |
{
|
|
405 |
cout << "File not specified";
|
|
406 |
exit(1);
|
|
407 |
}
|
|
408 |
else if (argc>numberOfOptions+2)
|
|
409 |
{
|
|
410 |
cout << "Too many arguments";
|
|
411 |
exit(1);
|
|
412 |
}
|
|
413 |
else
|
|
414 |
{
|
|
415 |
for (int i=1;i<=argc-2;i++)
|
|
416 |
{
|
|
417 |
if ( strcmp("-i", argv[i]) ==0 )
|
|
418 |
{
|
|
419 |
ignoreSomeSections=1;
|
|
420 |
}
|
|
421 |
else if ( strcmp("-a", argv[i]) ==0 )
|
|
422 |
{
|
|
423 |
printAll=1;
|
|
424 |
}
|
|
425 |
}
|
|
426 |
arg=argv[argc-1];
|
|
427 |
}
|
|
428 |
|
|
429 |
struct stat results;
|
|
430 |
stat(arg, &results);
|
|
431 |
FILE *elffile;
|
|
432 |
if((elffile = fopen(arg, "rb" )) == NULL)
|
|
433 |
{
|
|
434 |
cout << "Error opening file " << arg;
|
|
435 |
exit (1);
|
|
436 |
}
|
|
437 |
char* buffer=new char [results.st_size];//allocating enough memory
|
|
438 |
fread( buffer, sizeof( char ), results.st_size, elffile);
|
|
439 |
fclose(elffile);
|
|
440 |
|
|
441 |
if (strncmp(buffer, "!<arch>\x0A", 8) != 0)
|
|
442 |
{
|
|
443 |
// plain ELF file
|
|
444 |
if (do_elf_file(buffer, arg) != 0)
|
|
445 |
{
|
|
446 |
return 1;
|
|
447 |
}
|
|
448 |
return 0;
|
|
449 |
}
|
|
450 |
|
|
451 |
// library file
|
|
452 |
char* nextfile = buffer;
|
|
453 |
int remainder = results.st_size;
|
|
454 |
|
|
455 |
#define ADVANCE(n) nextfile+=(n); remainder-=(n);
|
|
456 |
|
|
457 |
ADVANCE(8);
|
|
458 |
|
|
459 |
while (remainder > 0)
|
|
460 |
{
|
|
461 |
int element_length = read_ar_element_header(nextfile);
|
|
462 |
ADVANCE(60);
|
|
463 |
|
|
464 |
if (element_length < 0 || element_length > remainder)
|
|
465 |
{
|
|
466 |
cout << "Error: archive file corrupt";
|
|
467 |
return 1;
|
|
468 |
}
|
|
469 |
|
|
470 |
if (strncmp(nextfile, "\x7F\x45\x4C\x46",4) == 0)
|
|
471 |
{
|
|
472 |
if (do_elf_file(nextfile, "archive_element") != 0)
|
|
473 |
{
|
|
474 |
return 1;
|
|
475 |
}
|
|
476 |
}
|
|
477 |
element_length += element_length&1; // round up to a multiple of 2
|
|
478 |
ADVANCE(element_length);
|
|
479 |
}
|
|
480 |
|
|
481 |
return 0;
|
|
482 |
}
|