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/* TAP2LEM.C: convert a .TAP file containing Lemmings levels to pairs
of .LEM and .BMP files
Copyright (c) 1997,9 Philip Kendall
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Author contact information:
E-mail: pak21@cam.ac.uk (until at least June 2002)
Postal address: 15 Crescent Road, Wokingham, Berks, RG40 2DB, England
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
const char *InFName="lemmings.tap";
const unsigned LevelLen=8405;
const char *OutFBase="level";
const char *OutFExt1=".lem";
const char *OutFExt2=".bmp";
#define OutFLen 13
#define BufLen 256
const unsigned BMPHeight=128;
const unsigned BMPWidth=512;
const unsigned char BMPHeader[] = {
0x42,0x4D,0x3E,0x20,0x00,0x00,0x00,0x00,
0x00,0x00,0x3E,0x00,0x00,0x00,0x28,0x00,
0x00,0x00,0x00,0x02,0x00,0x00,0x80,0x00,
0x00,0x00,0x01,0x00,0x01,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x02,0x00,
0x00,0x00,0x02,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0xFF,0xFF,0xFF,0x00
};
const unsigned BMPHeaderLen=sizeof(BMPHeader)/sizeof(unsigned char);
int DoLevel(FILE *f);
unsigned int ReadInt(FILE *f);
unsigned long ReadLong(FILE *f);
int main(int argc,char **argv)
{FILE *f;
if(argc<2) {fprintf(stderr,"Syntax: tap2lem tapefile\n"); return 4;}
f=fopen(argv[1],"rb");
if(ferror(f))
{fprintf(stderr,"Error opening %s for input\n",argv[1]); return 1;}
while( !feof(f) && !ferror(f) ) if(DoLevel(f)) {fclose(f); return 2;}
if(ferror(f))
{fprintf(stderr,"Error reading from %s\n",InFName); fclose(f);
return 3;
}
fclose(f);
return 0;
}
int DoLevel(FILE *f)
{unsigned Length,Good=0,i;
unsigned char ch,HLevel,*LevelData,CheckSum,OutFName[OutFLen],
OutFName2[OutFLen],Buffer[BufLen];
FILE *f2;
LevelData=(unsigned char*)malloc(LevelLen);
if(!LevelData)
{fprintf(stderr,"Not enough memory for LevelData\n"); return 1;}
/* For a Lemmings level, we're looking for a block of length 3 followed block
of length 8407
*/
while(!Good && !feof(f) && !ferror(f))
{
/* If the first block doesn't have length 3, get the next block */
if((Length=ReadInt(f))!=3)
{if(!feof(f) && !ferror(f)) fseek(f,Length,SEEK_CUR); continue;}
/* If the flag byte isn't 00h (header), get the next block */
if((ch=fgetc(f))!=0)
{if(!feof(f) && !ferror(f)) fseek(f,2,SEEK_CUR); continue;}
/* Get the level number as stored in the header, and the checksum */
HLevel=fgetc(f); ch=fgetc(f);
/* See if the next block has the right length; if it has, assume we have
a Lemmings level */
if((Length=ReadInt(f))!=LevelLen+2)
{if(!feof(f) && !ferror(f)) fseek(f,Length,SEEK_CUR); continue;}
/* If header checksum is wrong, print a warning */
if(ch!=HLevel)
fprintf(stderr,"Warning: header checksum for level %u is wrong\n",
(unsigned)HLevel );
/* Read in the level data's flag byte, and give up if it is not 0xff */
if((ch=fgetc(f))!=0xff)
{if(!feof(f) && !ferror(f)) fseek(f,LevelLen+1,SEEK_CUR); continue;}
/* Read in the level data */
fread(LevelData,LevelLen,1,f);
/* Finally, read in the checksum */
CheckSum=fgetc(f); ch=0xff;
for(i=0;i<LevelLen;i++) ch^=LevelData[i];
if(ch!=CheckSum)
fprintf(stderr,"Warning: data checksum for level %u is wrong\n",
(unsigned)LevelData[0] );
/* And say we're happy with this level */
Good=1;
}
/* If we didn't find anything, return */
if(!Good) {free(LevelData); return 0;}
/* If the two level numbers don't match up, print a warning */
if(HLevel!=LevelData[0])
fprintf(stderr,"Warning: level numbers specified in header and in data"
"differ\n In header: %u\n In data: %u\nUsing %u\n",
(unsigned)HLevel,(unsigned)LevelData[0],(unsigned)LevelData[0] );
/* Set up the output filenames */
strcpy(OutFName,OutFBase);
if(LevelData[0]<10) strcat(OutFName,"0");
sprintf(Buffer,"%u",(unsigned)LevelData[0x00]);
strcat(OutFName,Buffer); strcpy(OutFName2,OutFName);
strcat(OutFName,OutFExt1); strcat(OutFName2,OutFExt2);
/* Open the .LEM file */
f2=fopen(OutFName,"wt");
if(ferror(f2))
{fprintf(stderr,"Error opening %s for output\n",OutFName);
free(LevelData); return 2;
}
/* Buffer already contains the text version of the level number */
strcat(Buffer,","); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[0x14]); /* Rating */
strcat(Buffer,"\n"); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[0x01]); /* Number of lemmings */
strcat(Buffer,","); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[0x10]); /* Number to save */
strcat(Buffer,"\n"); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[0x02]); /* Initial release rate */
strcat(Buffer,"\n"); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[0x06]+1); /* Time/minutes */
strcat(Buffer,"\n"); fputs(Buffer,f2);
for(i=0x07;i<=0x0e;i++) /* Skills */
{sprintf(Buffer,"%u",(unsigned)LevelData[i]);
strcat(Buffer,(i==0x0e?"\n":",")); fputs(Buffer,f2);
}
fwrite(&LevelData[0x15],32,1,f2); fputc('\n',f2); /* Level name */
sprintf(Buffer,"%u",(unsigned)LevelData[0x04]*0x100+LevelData[0x03]);
strcat(Buffer,","); fputs(Buffer,f2); /* Trapdoor X */
sprintf(Buffer,"%u",(unsigned)LevelData[0x05]); /* Trapdoor Y */
strcat(Buffer,","); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[0x12]*0x100+LevelData[0x11]);
strcat(Buffer,","); fputs(Buffer,f2); /* Home X */
sprintf(Buffer,"%u",(unsigned)LevelData[0x13]); /* Home Y */
strcat(Buffer,"\n"); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[0x0f]); /* Colours */
strcat(Buffer,"\n"); fputs(Buffer,f2);
for(i=0x35;i<0x5d;i+=4) /* Hazards */
{sprintf(Buffer,"%u",(unsigned)LevelData[i]); /* Type */
strcat(Buffer,","); fputs(Buffer,f2);
sprintf(Buffer,"%u",(unsigned)LevelData[i+2]*0x100+LevelData[i+1]);
strcat(Buffer,","); fputs(Buffer,f2); /* X */
sprintf(Buffer,"%u",(unsigned)LevelData[i+3]); /* Y */
strcat(Buffer,"\n"); fputs(Buffer,f2);
}
fputs(OutFName2,f2); /* .BMP file name */
fclose(f2);
/* Open the .BMP file */
f2=fopen(OutFName2,"wb");
if(ferror(f2))
{fprintf(stderr,"Error opening %s for output\n",OutFName2);
free(LevelData); return 3;
}
/* Write out the .BMP header */
for(i=0;i<BMPHeaderLen;i++) fputc(BMPHeader[i],f2);
/* And the data */
for(i=1;i<=BMPHeight;i++)
fwrite(&LevelData[0xd5+(BMPHeight-i)*(BMPWidth/8)],(BMPWidth/8),1,f2);
fclose(f2);
free(LevelData);
return 0;
}
unsigned ReadInt(FILE *f) {return fgetc(f)+fgetc(f)*0x100;}
unsigned long ReadLong(FILE *f)
{return fgetc(f)+fgetc(f)*0x100+fgetc(f)*0x10000+fgetc(f)*0x1000000;}
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