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redrle: Add a -r flag to compress by rows (matching GF's behavior).

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This commit is contained in:
IIMarckus
2015-01-08 02:14:42 -07:00
parent 4d9fd56593
commit fa0761ea70
1 changed files with 62 additions and 9 deletions
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71
redtools/redrle.c
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@@ -1,5 +1,5 @@
/*
* Copyright © 2011 IIMarckus <iimarckus@gmail.com>
* Copyright © 2011, 2014 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
@@ -23,11 +23,12 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void
usage()
{
fprintf(stderr, "Usage: redrle [-d] infile outfile\n");
fprintf(stderr, "Usage: redrle [-dr] infile outfile\n");
exit(1);
}
@@ -35,15 +36,28 @@ int
main(int argc, char *argv[])
{
FILE *infile, *outfile;
int ch;
bool d = false; /* compress or decompress flag */
bool rows = false; /* compress individual rows or entire file */
if (argc < 3 || argc > 4)
usage();
if (strcmp(argv[1], "-d") == 0) {
if (argc != 4)
while ((ch = getopt(argc, argv, "dr")) != -1) {
switch(ch) {
case 'd':
d = true;
break;
case 'r':
rows = true;
break;
default:
usage();
d = true;
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (argc < 2) {
usage();
}
infile = fopen(argv[argc - 2], "rb");
@@ -80,17 +94,37 @@ main(int argc, char *argv[])
fputc(byte, outfile);
}
} else { /* compress */
int byte, count = 0, lastbyte = 0;
int byte, count = 0, lastbyte = 0, xpos = 0;
for (;;) {
byte = fgetc(infile);
if (feof(infile)) {
while (count > 0xF) {
if (rows && 20 - xpos <= 0xF) {
count -= (20 - xpos);
fputc(lastbyte << 4 |
(20 - xpos), outfile);
xpos = 0;
continue;
}
count -= 0xF;
fputc(lastbyte << 4 | 0xF, outfile);
xpos += 0xF;
if (xpos == 20)
xpos = 0;
}
if (count != 0) {
if (rows && 20 - xpos < count) {
count -= (20 - xpos);
fputc(lastbyte << 4 |
(20 - xpos), outfile);
xpos = 0;
}
fputc(lastbyte << 4 | count, outfile);
xpos += count;
if (xpos == 20)
xpos = 0;
count = 0;
}
break;
}
@@ -105,11 +139,30 @@ main(int argc, char *argv[])
++count;
else {
while (count > 0xF) {
if (rows && 20 - xpos <= 0xF) {
count -= (20 - xpos);
fputc(lastbyte << 4 |
(20 - xpos), outfile);
xpos = 0;
continue;
}
count -= 0xF;
fputc(lastbyte << 4 | 0xF, outfile);
xpos += 0xF;
if (xpos == 20)
xpos = 0;
}
if (count != 0) {
if (rows && 20 - xpos < count) {
count -= (20 - xpos);
fputc(lastbyte << 4 |
(20 - xpos), outfile);
xpos = 0;
}
fputc(lastbyte << 4 | count, outfile);
xpos += count;
if (xpos == 20)
xpos = 0;
count = 0;
}