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exe_sear.c
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exe_sear.c
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/*
* $Id: exe_sear.c,v 1.3 2003/10/16 10:32:46 andrew_belov Exp $
* ---------------------------------------------------------------------------
* Routines that fetch overlay data are located in this file.
*
*/
#include "arj.h"
#ifdef ELF_EXECUTABLES
#ifdef __QNXNTO__
#include <libelf.h>
#else
#include <elf.h>
#endif /* __QNXNTO__ */
#endif
DEBUGHDR(__FILE__) /* Debug information block */
/* ARJSFX module order */
#define MN_SFXJR 1
#define MN_SFX 2
#define MN_SFXV 3
#define MN_SFXSTUB 4
/* Define the ELF magic numbers if not defined yet */
#if defined(ELF_EXECUTABLES)&&!defined(ELFMAG)
static char elfmag[4]={'E', 'L', 'F', 0x7F};
#define ELFMAG elfmag
#define SELFMAG 4
#endif
#if SFX_LEVEL>=ARJ
/* Local variables */
static char overlay_sig[]="RJ_SFX";
/* Looks for ARJ_SFX signature */
static void browse(FILE *stream)
{
char buf[256];
unsigned long cur_pos, sig_pos;
int bytes_read;
int i;
char *buf_ptr;
while(1)
{
cur_pos=ftell(stream);
bytes_read=fread(buf, 1, sizeof(buf), stream);
if(bytes_read<=0)
error(M_CANTREAD);
buf_ptr=buf;
i=0;
while(i<bytes_read)
{
if(*buf_ptr=='A'&&!strcmp(buf_ptr+1, overlay_sig))
{
sig_pos=cur_pos+(unsigned long)i;
if(mget_dword(buf_ptr+8)==sig_pos)
goto loc_hdr;
}
i++;
buf_ptr++;
}
if(bytes_read==sizeof(buf))
fseek(stream, -16L, SEEK_CUR);
}
loc_hdr:
cur_pos+=(unsigned long)i+12L;
fseek(stream, cur_pos, SEEK_SET);
}
/* Writes the contents of a FAR block to the output stream */
static void farblock_output(FILE *stream, char FAR *block, unsigned long len)
{
#ifdef TILED
while(len-->0)
{
if(fputc((int)*(block++), stream)==EOF)
error(M_DISK_FULL);
}
#else
file_write(block, 1, len, stream);
#endif
}
#endif
/* Reads the EXE size from the header */
static unsigned long get_exe_size(FILE *stream)
{
#if SFX_LEVEL>=ARJ
unsigned long result=EXESIZE_ARJ;
#elif SFX_LEVEL==ARJSFXV
unsigned long result=EXESIZE_ARJSFXV;
#else
unsigned long result=EXESIZE_ARJSFX;
#endif
#ifndef ELF_EXECUTABLES
unsigned int remainder, blocks;
#else
Elf32_Ehdr ehdr;
Elf32_Shdr shdr;
unsigned long ref_point;
unsigned long cur_pos;
unsigned int i;
#endif
#ifndef ELF_EXECUTABLES /* Presume standard DOS or OS/2 EXE */
fseek(stream, 2L, SEEK_SET);
remainder=fget_word(stream);
blocks=fget_word(stream);
result=(unsigned long)(blocks-1)*512L+(unsigned long)remainder;
return(result);
#else /* ELF (Linux, OS/2 PPC, Solaris...) */
fread(&ehdr, 1, sizeof(ehdr), stream);
if(memcmp(ehdr.e_ident, ELFMAG, SELFMAG))
return(0);
result=ehdr.e_shoff+(unsigned long)ehdr.e_shentsize*ehdr.e_shnum;
fseek(stream, ehdr.e_shoff, SEEK_SET);
for(i=0; i<ehdr.e_shnum; i++)
{
fseek(stream, ehdr.e_shoff+(unsigned long)i*ehdr.e_shentsize, SEEK_SET);
cur_pos=ftell(stream);
fread(&shdr, 1, sizeof(shdr), stream);
ref_point=shdr.sh_offset+shdr.sh_size;
/* Ignore uninitialized sections (BSS) */
if(ref_point>result&&shdr.sh_type!=SHT_NOBITS)
result=ref_point;
}
return(result);
#endif
}
#if SFX_LEVEL>=ARJ
/* Performs all actions related to picking a block */
static void fetch_block(int num)
{
FILE *stream;
unsigned long exe_size;
int t_num;
unsigned long t_pos;
char buf[256];
int block_len;
int bytes_read;
unsigned int desc_word;
stream=file_open_noarch(exe_name, m_rb);
exe_size=get_exe_size(stream);
fseek(stream, exe_size, SEEK_SET);
t_pos=0L;
for(t_num=0; t_num<num; t_num++)
{
fseek(stream, t_pos, SEEK_CUR);
browse(stream);
t_pos=fget_longword(stream);
}
crc32term=CRC_MASK;
block_len=(int)min(sizeof(buf), t_pos);
while(t_pos>0)
{
bytes_read=fread(buf, 1, block_len, stream);
if(bytes_read<=0)
break;
crc32_for_block(buf, bytes_read);
farblock_output(aostream, (char FAR *)buf, (unsigned long)bytes_read);
t_pos-=(unsigned long)bytes_read;
block_len=(int)min(sizeof(buf), t_pos);
}
fclose(stream);
desc_word=SFXDESC_NONSFX;
if(create_sfx==SFXCRT_SFX&&multivolume_option)
desc_word=SFXDESC_SFXV;
else if(create_sfx==SFXCRT_SFX)
desc_word=SFXDESC_SFX;
else if(create_sfx==SFXCRT_SFXJR)
desc_word=SFXDESC_SFXJR;
fput_word(desc_word, aostream);
if(is_registered)
desc_word=REG_ID;
fput_word(desc_word, aostream);
crc32term^=CRC_MASK;
fput_dword(crc32term, aostream);
}
/* Picks the ARJSFX and stores ARJSFX run-time data */
void fetch_sfx()
{
fetch_block(MN_SFX);
}
/* Picks the ARJSFXJR and stores ARJSFXJR run-time data */
void fetch_sfxjr()
{
fetch_block(MN_SFXJR);
}
/* Picks the ARJSFXV and stores ARJSFXV run-time data */
void fetch_sfxv()
{
fetch_block(MN_SFXV);
}
/* Picks the SFXSTUB */
void fetch_sfxstub()
{
fetch_block(MN_SFXSTUB);
}
#endif
#if SFX_LEVEL<=ARJSFXV
/* SFX seek routine */
void sfx_seek()
{
unsigned long exe_size;
unsigned long fcrc;
unsigned int block_size, bytes_read;
char buf[256];
exe_size=get_exe_size(aistream);
fseek(aistream, exe_size, SEEK_SET);
main_hdr_offset=find_header(0, aistream);
fseek(aistream, -8L, SEEK_CUR);
exe_size=ftell(aistream);
reg_id=fget_word(aistream); /* Descriptive word */
reg_id=fget_word(aistream);
fcrc=fget_longword(aistream);
if(reg_id!=REG_ID)
reg_id=0;
fseek(aistream, 0L, SEEK_SET);
crc32term=CRC_MASK;
block_size=min((unsigned long)sizeof(buf), exe_size);
while(exe_size>0L)
{
bytes_read=fread(buf, 1, block_size, aistream);
if(bytes_read==0)
break;
crc32_for_block(buf, bytes_read);
exe_size-=(unsigned long)bytes_read;
block_size=min((unsigned long)block_size, exe_size);
}
if((crc32term^CRC_MASK)!=fcrc&&!skip_integrity_test)
error(M_DAMAGED_SFX);
fseek(aistream, main_hdr_offset, SEEK_SET);
}
#endif