$NetBSD: patch-af,v 1.1 2005/09/19 19:42:11 adrianp Exp $

--- libgadu-0.1/common.c.orig	2004-07-31 11:47:20.000000000 +0100
+++ libgadu-0.1/common.c
@@ -284,6 +284,8 @@ char *gg_read_line(int sock, char *buf, 
 {
 	int ret;
 
+	if (!buf || length < 0)
+		return NULL;
 	for (; length > 1; buf++, length--) {
 		do {
 			if ((ret = read(sock, buf, 1)) == -1 && errno != EINTR) {
@@ -340,7 +342,7 @@ char *gg_urlencode(const char *str)
 {
 	char *q, *buf, hex[] = "0123456789abcdef";
 	const char *p;
-	int size = 0;
+	unsigned int size = 0;
 
 	if (!str && !(str = strdup("")))
 		return NULL;
@@ -392,18 +394,18 @@ int gg_http_hash(const char *format, ...
 	va_start(ap, format);
 
 	for (j = 0; j < strlen(format); j++) {
-		unsigned char *arg, buf[16];
+		char *arg, buf[16];
 
 		if (format[j] == 'u') {
 			snprintf(buf, sizeof(buf), "%d", va_arg(ap, uin_t));
 			arg = buf;
 		} else {
-			if (!(arg = va_arg(ap, unsigned char*)))
+			if (!(arg = va_arg(ap, char*)))
 				arg = "";
 		}       
 
 		i = 0;
-		while ((c = (int) arg[i++]) != 0) {
+		while ((c = (unsigned char) arg[i++]) != 0) {
 			a = (c ^ b) + (c << 8);
 			b = (a >> 24) | (a << 8);
 		}
@@ -532,7 +534,7 @@ static char gg_base64_charset[] =
 char *gg_base64_encode(const char *buf)
 {
 	char *out, *res;
-	int i = 0, j = 0, k = 0, len = strlen(buf);
+	unsigned int i = 0, j = 0, k = 0, len = strlen(buf);
 	
 	res = out = malloc((len / 3 + 1) * 4 + 2);
 
@@ -590,7 +592,7 @@ char *gg_base64_decode(const char *buf)
 {
 	char *res, *save, *foo, val;
 	const char *end;
-	int index = 0;
+	unsigned int index = 0;
 
 	if (!buf)
 		return NULL;
@@ -684,7 +686,7 @@ static int gg_crc32_initialized = 0;
 static void gg_crc32_make_table()
 {
 	uint32_t h = 0;
-	int i, j;
+	unsigned int i, j;
 
 	memset(gg_crc32_table, 0, sizeof(gg_crc32_table));
 
@@ -713,6 +715,8 @@ uint32_t gg_crc32(uint32_t crc, const un
 {
 	if (!gg_crc32_initialized)
 		gg_crc32_make_table();
+	if (!buf || len < 0)
+		return crc;
 
 	crc ^= 0xffffffffL;