Cube  Diff

// run-length encoding and leaves out data for certain kinds of cubes, then zlib
// removes the last bits of redundancy. Both passes contribute greatly to the
// miniscule map sizes.

void
save_world(OFString *mname)
{
	resettagareas(); // wouldn't be able to reproduce tagged areas
	                 // otherwise
	voptimize();
	toptimize();
	if (mname.length == 0)
		mname = getclientmap();
	setnames(mname);
	backup(cgzname, bakname);
	gzFile f = gzopen([cgzname cStringWithEncoding: OFLocale.encoding],

				e.type, e.attr2, e.attr3, e.attr4 };
			endianswap(&tmp, sizeof(short), 4);
			gzwrite(f, &tmp, sizeof(struct persistent_entity));
		}
	}
	struct sqr *t = NULL;
	int sc = 0;
#define spurge                          \
	while (sc) {                    \
		gzputc(f, 255);         \
		if (sc > 255) {         \
			gzputc(f, 255); \
			sc -= 255;      \
		} else {                \
			gzputc(f, sc);  \
			sc = 0;         \
		}                       \
	}
	for (int k = 0; k < cubicsize; k++) {
		struct sqr *s = &world[k];
#define c(f) (s->f == t->f)
		// 4 types of blocks, to compress a bit:
		// 255 (2): same as previous block + count
		// 254 (3): same as previous, except light // deprecated

	settagareas();
}

COMMAND(savemap, ARG_1STR, ^ (OFString *mname) {
	save_world(mname);
})



void
load_world(OFString *mname) // still supports all map formats that have existed
                            // since the earliest cube betas!
{
	stopifrecording();
	cleardlights();
	pruneundos(0);
	setnames(mname);
	gzFile f = gzopen([cgzname cStringWithEncoding: OFLocale.encoding],
	    "rb9");