From dd1779c4c7581b0b863886371f891d9d545d6b27 Mon Sep 17 00:00:00 2001
From: Plex <thinkplex@riseup.net>
Date: Sun, 24 Oct 2021 22:50:22 +0200
Subject: writeVarInt

---
 Makefile  |  14 ++++++++++++++
 mcping    | Bin 0 -> 17840 bytes
 mcping.c  |  32 ++++++++++++++++++++++++++++++++
 mctypes.c |  36 ++++++++++++++++++++++++++++++++++++
 mctypes.h |  18 ++++++++++++++++++
 5 files changed, 100 insertions(+)
 create mode 100644 Makefile
 create mode 100755 mcping
 create mode 100644 mcping.c
 create mode 100644 mctypes.c
 create mode 100644 mctypes.h

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..38ff01b
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,14 @@
+CC=clang
+CFLAGS=-Wall -g
+
+mcping: mcping.c mctypes.o
+	$(CC) $(CFLAGS) $^ -o $@
+
+%.o: %.c %.h
+	$(CC) $(CFLAGS) -c $<
+
+lint:
+	indent -kr -ts4 *.c
+
+clean:
+	rm -f *.o *~
diff --git a/mcping b/mcping
new file mode 100755
index 0000000..6ab6d49
Binary files /dev/null and b/mcping differ
diff --git a/mcping.c b/mcping.c
new file mode 100644
index 0000000..a228114
--- /dev/null
+++ b/mcping.c
@@ -0,0 +1,32 @@
+#include <string.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/types.h>
+#include "mctypes.h"
+
+int main(int argc, char *argv[])
+{
+	if (argc == 1) {
+		printf("Usage: mcping [ADDRESS[:PORT]]\nPings a Minecraft server using the PING protocol.\n");
+		exit(EXIT_SUCCESS);
+	}
+	int opt;
+	while ((opt = getopt(argc, argv, "h")) != -1) {
+		switch (opt) {
+			case 'h':
+				exit(EXIT_SUCCESS);
+			default:
+				break;
+		}
+	}
+	varint n;
+	n = writeVarInt(atoi(argv[1]));
+	while((*n & 0b10000000) != 0) {
+		printf("%02X ", *n);
+		n++;
+	}
+	printf("%02X ", *n);
+	printf("\n");
+	return 0;
+}
diff --git a/mctypes.c b/mctypes.c
new file mode 100644
index 0000000..ad855e4
--- /dev/null
+++ b/mctypes.c
@@ -0,0 +1,36 @@
+#include "mctypes.h"
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+
+varint writeVarInt(unsigned int x)
+{
+	// unsigned int v = x;
+	varint n = malloc(sizeof(u_int8_t));
+	unsigned int size = 1;
+	while(1) {
+		n = reallocarray(n, size, sizeof(u_int8_t));
+		n[size-1] = x & 0x7F;
+		x >>= 7;
+		if(x == 0)
+			return n;
+		n[size-1] |= 0b10000000;
+		size++;
+	}
+	return n;
+}
+/*
+writeVarInt(varint x, int s)
+{
+	while (1) {
+		if ((x & 0xFFFFFF80) == 0) {
+			if (send(s, &x, 8, 0) == -1)
+				exit(EXIT_FAILURE);
+			return;
+		}
+		if (send(s, &x, 8, 0) == -1)
+			exit(EXIT_FAILURE);
+		
+		x >>= 7;
+	}
+} */
diff --git a/mctypes.h b/mctypes.h
new file mode 100644
index 0000000..3fe4a7f
--- /dev/null
+++ b/mctypes.h
@@ -0,0 +1,18 @@
+#include <sys/types.h>
+typedef u_int8_t *varint;
+typedef u_int8_t *varlong;
+
+typedef struct {
+	varint length;
+	char *content;
+} string;
+
+typedef struct {
+	varint length;
+	varint id;
+	char *data;;
+} packet;
+
+
+int writeVarInt(varint x);
+varint writeVarInt(unsigned int x);
-- 
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