mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-26 03:01:50 +01:00
155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/****************************************************************************
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* Genesis Plus 1.04
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*
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* Developer ROM injector.
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*
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* You should set ROMOFFSET to match ngc.c, as this will change as the
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* binary expands and/or contracts.
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****************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define DOLHEADERLENGTH 256 // GC DOL Header Length
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#define MAXTEXT 7 // Maximum 7 Text Sections
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#define MAXDATA 11 // Maximum 11 Data Sections
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struct DOLHEADER{
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unsigned int textOffsets[MAXTEXT];
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unsigned int dataOffsets[MAXDATA];
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unsigned int textAddress[MAXTEXT];
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unsigned int dataAddress[MAXDATA];
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unsigned int textLength[MAXTEXT];
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unsigned int dataLength[MAXDATA];
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unsigned int bssAddress;
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unsigned int bssLength;
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unsigned int entryPoint;
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unsigned int unused[MAXTEXT];
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} dolheader;
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unsigned int FLIP32(unsigned int b)
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{
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unsigned int c;
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c = ( b & 0xff000000 ) >> 24;
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c |= ( b & 0xff0000 ) >> 8;
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c |= ( b & 0xff00 ) << 8;
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c |= ( b & 0xff ) << 24;
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return c;
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}
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#define ROMOFFSET 0x80700000
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int main( int argc, char *argv[] )
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{
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FILE *infile, *outfile;
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char *dol;
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char *rom;
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int dollen, romlen, outlen;
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char *sig = "GENPLUSR";
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if ( argc != 4 )
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{
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printf("Usage : %s genplus.dol filename_of_your_rom.bin (or .smd) output.dol\n", argv[0]);
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return 1;
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}
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/*** Try to open all three handles ***/
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infile = fopen(argv[1], "rb");
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if ( infile == NULL )
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{
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printf("Unable to open %s for reading\n", argv[1]);
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return 1;
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}
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/*** Allocate and load ***/
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fseek(infile, 0, SEEK_END);
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dollen=ftell(infile);
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fseek(infile, 0, SEEK_SET);
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dol = calloc(sizeof(char), dollen + 32);
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if ( fread(dol, 1, dollen, infile ) != dollen )
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{
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free(dol);
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printf("Error reading %s\n", argv[1]);
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fclose(infile);
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return 1;
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}
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fclose(infile);
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infile = fopen(argv[2], "rb");
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if ( infile == NULL )
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{
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printf("Unable to open %s for reading\n", argv[2]);
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free(dol);
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return 1;
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}
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/*** Allocate and load ***/
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fseek( infile, 0, SEEK_END);
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romlen = ftell(infile);
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fseek( infile, 0, SEEK_SET);
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rom = calloc( sizeof(char), romlen + 48 );
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if ( fread(rom, 1, romlen, infile) != romlen )
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{
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printf("Error reading %s\n", argv[2]);
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fclose(infile);
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free(rom);
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free(dol);
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return 1;
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}
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fclose(infile);
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/*** Ok, now have both in memory - so update the dol header and get this file done -;) ***/
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memcpy(&dolheader, dol, DOLHEADERLENGTH);
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/*** Align to 32 bytes - no real reason, I just like it -;) ***/
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if ( dollen & 0x1f )
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dollen = ( dollen & ~0x1f ) + 0x20;
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dolheader.dataOffsets[1] = FLIP32(dollen);
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dolheader.dataAddress[1] = FLIP32(ROMOFFSET);
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dolheader.dataLength[1] = FLIP32(romlen + 32);
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/*** Move the updated header back ***/
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memcpy(dol, &dolheader, DOLHEADERLENGTH);
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outfile = fopen(argv[3], "wb");
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if ( outfile == NULL )
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{
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printf("Unable to open %s for writing!\n", argv[3]);
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free(rom);
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free(dol);
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}
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/*** Now simply update the files ***/
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fwrite(dol, 1, dollen, outfile);
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fwrite(sig, 1, 8, outfile);
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outlen = FLIP32(romlen);
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fwrite(&outlen, 1, 4, outfile);
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char align[32];
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memset(align, 0, 32);
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fwrite(align, 1, 20, outfile);
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fwrite(rom, 1, romlen, outfile);
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fclose(outfile);
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free(dol);
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free(rom);
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printf("Output file %s created successfully\n", argv[3]);
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return 0;
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}
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