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