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/*
* Copyright © 2011 IIMarckus <iimarckus@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This program compresses or decompresses the Town Map tilemap
* from Pokémon Red, Blue, and Yellow.
*/
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
void
usage()
{
fprintf(stderr, "Usage: redrle [-d] infile outfile\n");
exit(1);
}
int
main(int argc, char *argv[])
{
FILE *infile, *outfile;
bool d = false; /* compress or decompress flag */
if (argc < 3 || argc > 4)
usage();
if (strcmp(argv[1], "-d") == 0) {
if (argc != 4)
usage();
d = true;
}
infile = fopen(argv[argc - 2], "rb");
if (infile == NULL) {
fprintf(stderr, "Error opening file '%s': ", argv[argc - 2]);
perror(NULL);
exit(1);
}
outfile = fopen(argv[argc - 1], "wb");
if (outfile == NULL) {
fprintf(stderr, "Error opening file '%s': ", argv[argc - 1]);
perror(NULL);
exit(1);
}
if (d) { /* decompress */
for (;;) {
int i, count;
int byte = fgetc(infile);
if (byte == 0)
break;
count = byte & 0xF;
byte >>= 4;
if (feof(infile)) {
fprintf(stderr, "Decompress error: reached "
"end of file without finding terminating "
"null byte.\n");
exit(1);
}
for (i = 0; i < count;
++i)
fputc(byte, outfile);
}
} else { /* compress */
int byte, count = 0, lastbyte = 0;
for (;;) {
byte = fgetc(infile);
if (feof(infile)) {
while (count > 0xF) {
count -= 0xF;
fputc(lastbyte << 4 | 0xF, outfile);
}
if (count != 0) {
fputc(lastbyte << 4 | count, outfile);
}
break;
}
if (byte > 0xF) {
fprintf(stderr, "Compress error: read a byte "
"greater than 0xF.\n");
exit(1);
}
if (byte == lastbyte)
++count;
else {
while (count > 0xF) {
count -= 0xF;
fputc(lastbyte << 4 | 0xF, outfile);
}
if (count != 0) {
fputc(lastbyte << 4 | count, outfile);
count = 0;
}
lastbyte = byte;
count = 1;
}
}
fputc(0, outfile); /* Terminating 0x00 */
}
fclose(infile);
fclose(outfile);
return 0;
}
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