/* encode.c 
Written by, Sohail Qayum Malik<sohail@stupidcomputing.com> */

 #include "encode.h"

void main(int argc, char * argv[]){

   unsigned int flag             = ZERO;

   short int bootBlockFileHandle = ZERO;   
   short int bootFileHandle      = ZERO;

   if( argc < THREE ){
      printf("Incorrect usage.\n"); 
      printf("Usage example.... %s bootblock boot\n", argv[ZERO]);
      printf("bootblock is your partition bootsector code....\n");
      printf("boot is your kernel.\n");
      return;
   }

   flag = ZERO;
   flag =  readSector(sectorBuffer, DRIVE_FD + HEAD_ZERO, TRACK + SECTOR_ONE, SECTORS);  
   if(flag != 0){
      printf("Read error %d\n", flag);
      return;
   }

   if( (bootBlockFileHandle = open( argv[ONE], O_RDONLY | O_BINARY )) == (int)LESS_THAN_ZERO){
      printf("Unable to open %s .\n", argv[ONE]);
      return;
   }

   if( (bootFileHandle = open( argv[TWO], O_RDONLY | O_BINARY )) == (int)LESS_THAN_ZERO){
      printf("Unable to open %s .\n", argv[TWO]);
      close(bootBlockFileHandle);
      return;
   }

   printf("%s is accessed.\n", argv[ONE]);
   printf("%s is accessed.\n", argv[TWO]);
   
   numberOfBytesReadBootBlock = read(bootBlockFileHandle, (sectorBuffer + 62), SECTOR_SIZE);
   numberOfBytesReadBoot = read(bootFileHandle, (sectorBuffer + SECTOR_SIZE), SECTOR_SIZE);
   sectorBuffer[SYMBOLAINDEX] = SYMBOLA;
   sectorBuffer[SYMBOLBINDEX] = SYMBOLB;

   if( numberOfBytesReadBootBlock == (int)LESS_THAN_ZERO || numberOfBytesReadBoot == (int)LESS_THAN_ZERO )
      printf("Unable to read either %s or %s.\n", argv[ONE], argv[TWO]);
   else{
      printf("%d bytes read from %s.\n", numberOfBytesReadBootBlock, argv[ONE]);
      printf("%d bytes read from %s.\n", numberOfBytesReadBoot, argv[TWO]);
      printf("Attempting a write to the disk.... ");
      flag = ZERO;
      flag =  writeSector(sectorBuffer, DRIVE_FD + HEAD_ZERO, TRACK + SECTOR_ONE, (SECTORS * TWO));  
      if(flag != 0){
        printf("Write error %d\n", flag);
        return;
      }
      printf("write completed.\n");
      printf(":-) bye.\n");
   }  
   

   close(bootBlockFileHandle);
   close(bootFileHandle);

}