amritmani
Newbie level 4
hi
I have the folloing decoder code in C can anyone please send me the code in VHdl which decode a input file and read it from memory. I urgently required that. I am new
to this field please help
I have the folloing decoder code in C can anyone please send me the code in VHdl which decode a input file and read it from memory. I urgently required that. I am new
Code:
/* Filename: GTRLE35.C
Description: A Run-Length Encoding (RLE) Implementation.
How it works:
If there is a run of bytes, two bytes are output
and then the next number of runs are encoded.
Example: abcddddd
Encoding: abcdd3 {regard '3' as a value.}
Written by: Gerald Tamayo
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void copyright (void);
void rle_encode (FILE *in, FILE *out);
void rle_decode (FILE *in, FILE *out);
int main (int argc, char *argv[])
{
FILE *in, *out;
if (argc < 3 || argc > 4){
fprintf(stderr, "\n Run Length Encoding (RLE) implementation.\n"
"\n Usage : gtrle inputfile outputfile [/d]");
copyright();
return 0;
}
in = fopen(argv[1], "rb");
if (!in) {
fprintf(stderr, "\n Error opening input file!");
copyright();
return 0;
}
out = fopen(argv[2], "wb");
if (!out) {
fprintf(stderr, "\n Error opening output file!");
copyright();
return 0;
}
if (argc == 4){
if (!strcmp(argv[3], "/d") || !strcmp(argv[3], "/D")){
fprintf(stderr, "\n Run-Length decoding...");
rle_decode(in, out);
}
else {
fprintf(stderr, "\n Error! Unknown: \"%s\"\n", argv[3]);
return 0;
}
}
else {
fprintf(stderr, "\n Run-Length encoding...");
rle_encode(in, out);
}
fprintf(stderr, "complete.\n");
if (in ) fclose(in);
if (out) fclose(out);
return 0;
}
void rle_encode (FILE *in, FILE *out)
{
int c, prev, rle_cnt = 0;
/* get first byte and assign it as the *previous* byte. */
if ((c=getc(in)) != EOF) {
putc((unsigned char) c, out);
prev = c;
}
else return;
while ((c=getc(in)) != EOF) {
if (c != prev) {
/* if there's a run, encode it. */
if (rle_cnt) {
putc((unsigned char) prev, out);
putc((unsigned char) rle_cnt-1, out);
rle_cnt = 0;
}
/* then encode the new byte. */
putc((unsigned char) c, out);
prev = c;
}
else {
/* increment count; if count == 256, quickly encode it. */
if ((++rle_cnt) == 256) {
/* the first byte of the 256 bytes. */
putc((unsigned char) prev, out);
/* the next 255 bytes. (rle_cnt-1) == 255. */
putc((unsigned char) 255, out);
rle_cnt = 0;
}
}
}
/* if there's a run, encode it. */
if (rle_cnt) {
putc((unsigned char) prev, out);
putc((unsigned char) rle_cnt-1, out);
}
}
void rle_decode (FILE *in, FILE *out)
{
int c, prev, rle_cnt;
/* get first byte and assign it as the *previous* byte. */
if ((c=getc(in)) != EOF) {
prev = c;
putc((unsigned char) c, out);
}
else return;
while ((c=getc(in)) != EOF) {
if (c == prev) {
putc((unsigned char) prev, out);
/* output the next "run" of bytes, as
stored in the rle_cnt variable.
*/
if ((rle_cnt = getc(in)) != EOF) {
while(rle_cnt--) {
putc((unsigned char) prev, out);
}
}
else break;
}
else {
putc((unsigned char) c, out);
prev = c;
}
}
}
void copyright (void)
{
fprintf(stderr, "\n\n Written by: Gerald Tamayo\n");
}
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