bintools/elftools/getexports/getdirective.cpp
author jjkang
Fri, 25 Jun 2010 18:11:34 +0800
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add deprecated files
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/*
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* Copyright (c) 2004-2009 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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#define ADDR(rtype, p, o) (rtype *)(((char *)p) + o)
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void croak(char * s)
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{
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  printf("GETDIRECTIVE ERROR: %s\n", s);
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  exit(EXIT_FAILURE);
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}
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void croak2(char * s1, char * s2)
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{
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  printf("GETDIRECTIVE ERROR: %s %s\n", s1, s2);
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  exit(EXIT_FAILURE);
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}
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int GetFileSize(FILE * f, char * file)
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{
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  int r = fseek(f, 0, SEEK_END);
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  if (r) croak2("can't seek to end of file:", file);
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  r = ftell(f);
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  rewind(f);
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  return r;
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}
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void EnsureElf(Elf32_Ehdr* ef)
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	{
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	// Do nothing for now
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	(void)ef;
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	}
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Elf32_Ehdr* OpenElfFile (char* file)
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	{
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	Elf32_Ehdr* eh;
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	FILE* f = fopen(file, "rb");
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	if (!f)
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		croak2("can't open file:", file);
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	int fsize = GetFileSize(f, file);
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	eh = (Elf32_Ehdr*)malloc(fsize);
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	if (!eh)
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		croak("Out of memory");
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	if (fread(eh, fsize, 1, f) != 1)
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		croak2("Can't read file", file);
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	EnsureElf(eh);
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	return eh;
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	}
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void PrintDirectiveSections (Elf32_Ehdr * eh)
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{
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  int shoff = eh->e_shoff;                      // offset of section header table
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  if (shoff) {
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    Elf32_Shdr * shdr = ADDR(Elf32_Shdr, eh, shoff);
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    int shnum = eh->e_shnum;                    // number of section headers
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	// e_shnum will be 0 if the number of sections is >= SHN_LORESERVE (0xff00)
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	// If this is the case, sh_size contains the actual number of section headers.
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	// If sh_size is 0, there really aren't any section headers.
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	if (!shnum)
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		shnum = shdr->sh_size;
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    int shstrndx = eh->e_shstrndx;
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	// If the section name string table index is >= SHN_LORESERVE (0xff00), shstrndx
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	// contains SHN_XINDEX (0xffff).
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	// If this is the case, sh_link contains the actual index of the section name string
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	// table, otherwise sh_link is 0.
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	if (shstrndx >= 65535)
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		shstrndx = shdr->sh_link;
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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);
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    for (int i = 0; i < shnum; i++) {
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      if (i != shstrndx) {
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	if (!strcmp(".directive", &sname[shdr[i].sh_name])) {
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	  // we're in business. print the section to stdout
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	  char * data = ADDR(char, eh, shdr[i].sh_offset);
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	  int size = shdr[i].sh_size;
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	  fwrite(data, size, 1, stdout);
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	  printf("\n");
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	}
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      }
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    }
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  }
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}
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int main(int argc, char** argv)
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	{
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	(void)argc;
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	char* file = argv[1];
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	PrintDirectiveSections(OpenElfFile(file));
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	return EXIT_SUCCESS;
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	}
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