REC.CPP

 /*  File  rec.cpp
     by Dustin Caldwell   (dustin@gse.utah.edu)
 */

 #include <dos.h>
 #include <stdio.h>
 #include <ctype.h>
 #include <stdlib.h>

 void helpdoc();

 main()
 {
         FILE *rfp, *wfp;
         unsigned char ch, c;
         char s[20];

         if((rfp=fopen(_argv[1], "r"))==NULL)      /* open the read file */
         {
                 printf("cannot open file %s \n",_argv[1]);
                 helpdoc();
                 exit(-1);
         }

         if((wfp=fopen(_argv[2], "wb"))==NULL)     /* open the write file */
         {
                 printf("cannot open file %s \n",_argv[1]);
                 helpdoc();
                 exit(-1);
         }

         c=0;
         ch=fgetc(rfp);
         while(!feof(rfp))                       /* loop for whole file */
         {
                 if(isalnum(ch))                 /* only 'see' valid ascii chars */
                 {
                         c=0;
                         while(isdigit(ch))      /* only use decimal digits (0-9) */
                         {
                                 s[c]=ch;        /* build a string containing the number */
                                 c++;
                                 ch=fgetc(rfp);
                         }
                         s[c]=NULL;              /* must have NULL terminator */
                         fputc(atoi(s), wfp);/* write the binary equivalent to file */
                 }
                 ch=fgetc(rfp);                  /* loop until next number starts */
         }

         fclose(rfp);                    /* close up */
         fclose(wfp);
 }

 void helpdoc()          /* print help message */
 {
         printf("\n   Text File Encoder\n\n");
         printf("\n Syntax:  rec text_file_name binary_file_name\n\n");
         printf("by Dustin Caldwell  (dustin@gse.utah.edu)\n\n");
         printf("This is a program that reads an ascii tab-\n");
         printf("delimited file and builds a binary file where\n");
         printf("each byte of the binary file is one of the decimal\n");
         printf("digits in the text file.\n");
         printf(" eg:\n\n");
         printf("c:\>rec son3.txt son3.mid\n\n");
         printf("(This will create a file called son3.mid which is\n");
         printf("a valid binary file)\n\n");
         printf("(dec.exe may also be useful, as it decodes binary files)\n\n");
         printf("Have Fun!!\n");
 }

Standard MIDI Format