romunpack.c

#include<stdio.h>
#include<string.h>
#pragma pack(1)
typedef struct _romheader {
	char unknown[32];
	char mark[11];
	char flag[5];
	char unknown2[16];
} ROMHEADER;
typedef struct _fileheader {
	char filename[11];
	char flag[1];
	unsigned short flag2[2];
	unsigned short flag3[8];
} FILEHEADER;
int main(int argc,char **argv){
	if(argc!=2){ fprintf(stderr,"filename.\n"); }
	printf("input=%s",argv[1]);
	FILE *fin=fopen(argv[1],"rb");
	if( fin ==NULL ){ fprintf(stderr,"input file error\n"); }
	ROMHEADER romheader={0};
	char buf[128];
	memset(buf,0,128);
	printf("sizeof(ROMHEADER)=%d,sizeof(FILEHEADER)=%d\n",sizeof(ROMHEADER),sizeof(FILEHEADER));
	fread(&romheader,1,sizeof(ROMHEADER),fin);
	if(memcmp(romheader.mark,"BLTROM",6)){
		fprintf(stderr,"not BLTROM,but %s\n",romheader.mark);
		exit(1);
	}
	FILEHEADER fhead={0};
	while(!feof(fin)){
		printf("fin pos=0x%x\n",fin);
		fread(&fhead,1,sizeof(fhead),fin);
		if( (fhead.filename[0] & 0xff ) == 0xff ){
			printf("end @0x%x\n",ftell(fin));
			break;
		}
		printf("filename:%.11s flag=0x%02x\n",fhead.filename,fhead.flag[0]);
		printf("bodysize=%d(%x)\n",fhead.flag3[6],fhead.flag3[6]);
		char outfile[128];
		for(int n=0;n<8;n++){
			if( fhead.filename[n] == ' ' ) { fhead.filename[n] = 0; }
		}
		mkdir("ROMEXT");
		sprintf(outfile,"ROMEXT/%.8s.%.3s",fhead.filename,fhead.filename+8);
		printf("%s\n",outfile);
		FILE *fout=fopen(outfile,"wb");
		int cnt=0;
		int breakcnt= (fhead.flag3[6]+16) & 0xfffffff0;
		while(!feof(fin)){
			int c=fgetc(fin);
			cnt++;
			if( cnt <= fhead.flag3[6] ){
				fputc(c,fout);
			}
			if( cnt == breakcnt ){
				printf("readbreak on 0x%x\n",ftell(fin));
				break;
			}
		}
		fclose(fout);
	}
	fclose(fin);
}