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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "elf.h"
#ifdef WIN32
#define strcasecmp _stricmp
#endif
#define MAX_prg_entry_count 128
#ifndef false
#define false 0
#endif
#ifndef true
#define true 1
#endif
char *in_file = NULL;
char *out_file = NULL;
int quiet;
int copydata( FILE *in, FILE *out, int len )
{
char buff[8192];
int i,readlen;
while( len > 0 )
{
readlen = len;
if( readlen > 8192 )
{
readlen = 8192;
}
i = fread( buff, 1, readlen, in );
fwrite( buff, 1, i, out );
if( i < readlen )
{
break;
}
len -= readlen;
}
return( 0 );
} /* copydata */
int convertELF( void )
{
ELF_HEADER head;
PRG_HEADER prg_heads[MAX_prg_entry_count];
int i;
char *output_name;
FILE *in_fp;
FILE *out_fp;
/* Generate output filename if no output is specified */
if( out_file )
{
output_name = out_file;
}
else
{
char *ptr;
output_name = strdup( in_file );
ptr = &output_name[strlen(output_name)];
while (ptr != output_name)
{
if (*ptr == '.')
break;
else
ptr--;
}
if( ptr != output_name )
{
strcpy( ptr, ".cpe" );
}
else
{
strcat( ptr, ".cpe" );
}
}
if( !out_file )
{
free( output_name );
}
if( !( in_fp = fopen( in_file, "rb" ) ) )
{
printf( "Cannot open input file.\n" );
return( -1 );
}
/* read ELF header */
fread( &head, 1, sizeof(head), in_fp );
/* test header to make sure it is valid */
if( head.magic != 0x464c457f )
{
printf( "File is not an ELF file.\n" );
fclose( in_fp );
return( -1 );
}
if( head.type != 2 )
{
printf( "Only executable ELF files are supported.\n" );
fclose( in_fp );
return( -1 );
}
if( head.instr_set != 8 )
{
printf( "ELF file is not a MIPS binary.\n" );
fclose( in_fp );
return( -1 );
}
if( head.word_size != 1 )
{
printf( "Only 32-bit ELF files are supported.\n" );
fclose( in_fp );
return( -1 );
}
if( head.endianness != 1 )
{
printf( "Only little endian ELF files are supported.\n" );
fclose( in_fp );
return( -1 );
}
/* read program headers */
fseek( in_fp, head.prg_head_pos, SEEK_SET );
fread( prg_heads, sizeof( PRG_HEADER ), head.prg_entry_count, in_fp );
if( !quiet )
{
printf( "pc:%08x\n", head.prg_entry_addr );
}
/* create the CPE file */
printf( "%s\n", output_name );
if( !( out_fp = fopen( output_name, "wb" ) ) )
{
printf( "Cannot create output file.\n" );
return( -1 );
}
/* create file header */
fputs( "CPE", out_fp );
fputc( 0x01, out_fp );
/* select unit 0 */
fputc( 0x08, out_fp ); /* chunk ID */
fputc( 0x00, out_fp ); /* unit number */
/* set entrypoint */
fputc( 0x03, out_fp ); /* chunk ID */
fputc( 0x90, out_fp ); /* entry point type */
fputc( 0x00, out_fp );
fwrite( &head.prg_entry_addr, 1, 4, out_fp );
/* copy the program chunks */
for( i=0; i<head.prg_entry_count; i++ )
{
if( prg_heads[i].flags == 4 )
{
continue;
}
/* seek to location of program chunk */
fseek( in_fp, prg_heads[i].p_offset, SEEK_SET );
/* create load chunk */
fputc( 0x01, out_fp ); /* chunk ID */
fwrite( &prg_heads[i].p_vaddr, 1, 4, out_fp ); /* load address */
fwrite( &prg_heads[i].p_filesz, 1, 4, out_fp ); /* load length */
/* copy the chunk data */
copydata( in_fp, out_fp, prg_heads[i].p_filesz );
}
/* end of file chunk */
fputc( 0x00, out_fp );
/* close files */
fclose( in_fp );
fclose( out_fp );
return( 0 );
} /* convertELF */
int main( int argc, char *argv[] )
{
int i;
quiet = false;
/* parse program arguments */
for( i=1; i<argc; i++ )
{
if( strcasecmp( "-q", argv[i] ) == 0 )
{
quiet = true;
}
else
{
if( in_file == NULL )
{
in_file = argv[i];
}
else if( out_file == NULL )
{
out_file = argv[i];
}
}
}
/* print banner if not in quiet mode */
if( !quiet )
{
printf( "PSn00bSDK elf2cpe - Experimental ELF to CPE executable "
"converter\n" );
printf( "2021 Meido-Tek Productions\n\n" );
}
/* print usage parameters if no arguments specified */
if( argc == 1 )
{
printf( "Usage:\n" );
printf( " elf2cpe [-q] <elf_file> [cpe_file]\n" );
return( 0 );
}
if( !in_file )
{
printf( "No input file specified.\n" );
return( 0 );
}
return( convertELF() );
} /* main */
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