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/* ram_image.c by Steve Rhoads 11/7/05

 * This program take the ram_xilinx.vhd file as input

 * and the code.txt file as input.

 * It then creates ram_image.vhd as output with the

 * initialization vectors set to the contents of code.txt.

 */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define BUF_SIZE (1024*1024)

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

{

   FILE *file;

   int i, j, index, size, count;

   char *buf, *ptr, *ptr_list[64*4], text[80];

   unsigned int *code;

   if(argc < 4)

   {

      printf("Usage: ram_image <in.vhd> <in_code.txt> <out.vhd>\n");

      printf("Usage: ram_image ram_xilinx.vhd code.txt ram_image.vhd\n");

      return 0;

   }

   buf = (char*)malloc(BUF_SIZE);

   code = (unsigned int*)malloc(BUF_SIZE);

   //Read ram_xilinx.vhd

   file = fopen(argv[1], "rb");

   if(file == NULL)

   {

      printf("Can't open %s!\n", argv[1]);

      return -1;

   }

   size = fread(buf, 1, BUF_SIZE, file);

   fclose(file);

   //Read code.txt

   file = fopen(argv[2], "r");

   if(file == NULL)

   {

      printf("Can't open %s!\n", argv[2]);

      return -1;

   }

   for(count = 0; count < 16*1024; ++count)

   {

      if(feof(file))

         break;

      fscanf(file, "%x", &code[count]);

   }

   fclose(file);

   //Find 'INIT_00 => X"'

   ptr = buf;

   for(i = 0; i < 64*4; ++i)

   {

      sprintf(text, "INIT_%2.2X => X\"", i % 64);

      ptr = strstr(ptr, text);

      if(ptr == NULL)

      {

         printf("ERROR:  Can't find '%s' in file!\n", text);

         return -1;

      }

      ptr_list[i] = ptr + strlen(text);

   }

   //Modify vhdl source code

   j = 62;

   for(i = 0; i < count; ++i)

   {

      sprintf(text, "%8.8x", code[i]);

      index = i / 32;

      ptr_list[index][j] = text[0];

      ptr_list[index][j+1] = text[1];

      ptr_list[index+64][j] = text[2];

      ptr_list[index+64][j+1] = text[3];

      ptr_list[index+128][j] = text[4];

      ptr_list[index+128][j+1] = text[5];

      ptr_list[index+192][j] = text[6];

      ptr_list[index+192][j+1] = text[7];

      j -= 2;

      if(j < 0)

         j = 62;

   }

   //Write ram_image.vhd

   file = fopen(argv[3], "wb");

   if(file == NULL)

   {

      printf("Can't write %s!\n", argv[3]);

      return -1;

   }

   fwrite(buf, 1, size, file);

   fclose(file);

   free(buf);

   free(code);

   return 0;

}