add very small websocket example

xor.c

@@ -0,0 +1,33 @@
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+void xor(char *buf, char *pattern, size_t l){
+	size_t i;
+	for(i = 0; i < l; ++i)
+		printf("%c", buf[i] ^ pattern[i]);
+}
+
+int main(int argc, char **argv){
+	if(argc != 3){
+		printf("Usage: %s <infile> <password>\n", argv[0]);
+		return -1;
+	}
+	char *key = strdup(argv[2]);
+	size_t n = 0, keylen = strlen(key);
+	char *buff = malloc(keylen);
+	int f = open(argv[1], O_RDONLY);
+	if(f < 0){
+		perror("Can't open file");
+		return f;
+	}
+	do{
+		n = read(f, buff, keylen);
+		xor(buff, key, n);
+	}while(n);
+	return 0;
+}