#include <stdio.h>
#include <stdlib.h>

/* cc ulzenc.c -o ulzenc && ./ulzenc example.txt */

static int
error(const char *name, const char *msg)
{
	fprintf(stderr, "%s: %s\n", name, msg);
	return 0;
}

char *ptr, *a, mem[0x10000];

int
get_lit(int i)
{
	return 0;
}

int
encode_ulz(FILE *src)
{
	int i, j, ptr = 0, length = 0;
	a = malloc(0x10000);
	/* load */
	while(fread(a + length, 1, 1, src) && ++length) {}
	/* encode */
	for(i = 0; i < length; i++) {
		/* try to make a CPY */

		/* try to make a LIT */
		for(j = i; j - i < 127 && j < length; j++) {}
		if(i != j) {
			int litlen = j - i;
			/* LIT */
			mem[ptr++] = litlen;
			/* LIT(body) */
			for(j = i; j - i < litlen + 1; j++) mem[ptr++] = a[j];
		}
		i += j - 1;
	}
	return ptr - 1;
}

int
main(int argc, char *argv[])
{
	int res;
	FILE *src, *dst;
	if(argv[1][0] == '-' && argv[1][1] == 'v')
		return !fprintf(stdout, "Ulzenc - ULZ Encoder, 15 Nov 2023.\n");
	if(argc != 3)
		return error("usage", "ulzenc [-v] a.bin b.ulz ");
	if(!(src = fopen(argv[1], "rb")))
		return !error("Invalid input file", argv[1]);
	res = encode_ulz(src);
	if(!(dst = fopen(argv[2], "wb")))
		return !error("Invalid output file", argv[1]);
	fwrite(&mem, res, 1, dst);
	printf("Compressed %s -> %s(%d bytes).\n", argv[1], argv[2], res);
	return 0;
}