#include <err.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <zlib.h>

static uint8_t zbuf[0x1000];
static uint8_t buf[0x1000 * 0x1000];

int
main(int argc, char **argv)
{
	size_t zbuf_len, buf_len;
	ssize_t n;
	z_stream stream;
	int error;

	n = read(STDIN_FILENO, zbuf, sizeof(zbuf));
	if (n == -1)
		err(1, "read");

	zbuf_len = n;

	stream.next_in = zbuf;
	stream.avail_in = zbuf_len;
	stream.next_out = buf;
	stream.avail_out = sizeof(buf);
	stream.zalloc = NULL;
	stream.zfree = NULL;

	error = inflateInit2(&stream, -15);
	if (error != Z_OK)
		errx(1, "inflateInit2: %s (%d)", zError(error), error);

	error = inflate(&stream, Z_FINISH);
	if (error != Z_STREAM_END) {
		inflateEnd(&stream);
		errx(1, "inflate: %s (%d)", zError(error), error);
	}

	buf_len = stream.total_out;
	n = write(STDOUT_FILENO, buf, buf_len);
	if (n == -1)
		err(1, "write");
	if (n < 0)
		errx(1, "negative write: %zd", n);
	if ((size_t)n != buf_len)
		errx(1, "short write: %zd", n);

	return 0;
}