Move base64 out of chat.h

1 files changed, 29 insertions, 0 deletions

diff --git a/handle.c b/handle.c
index f76a181..77f0806 100644
--- a/handle.c
+++ b/handle.c
@@ -118,6 +118,35 @@ static void handleCap(struct Message *msg) {
 	}
 }
 
+#define BASE64_SIZE(len) (1 + ((len) + 2) / 3 * 4)
+
+static void base64(char *dst, const byte *src, size_t len) {
+	static const char Base64[64] = {
+		"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
+	};
+	size_t i = 0;
+	while (len > 2) {
+		dst[i++] = Base64[0x3F & (src[0] >> 2)];
+		dst[i++] = Base64[0x3F & (src[0] << 4 | src[1] >> 4)];
+		dst[i++] = Base64[0x3F & (src[1] << 2 | src[2] >> 6)];
+		dst[i++] = Base64[0x3F & src[2]];
+		src += 3;
+		len -= 3;
+	}
+	if (len) {
+		dst[i++] = Base64[0x3F & (src[0] >> 2)];
+		if (len > 1) {
+			dst[i++] = Base64[0x3F & (src[0] << 4 | src[1] >> 4)];
+			dst[i++] = Base64[0x3F & (src[1] << 2)];
+		} else {
+			dst[i++] = Base64[0x3F & (src[0] << 4)];
+			dst[i++] = '=';
+		}
+		dst[i++] = '=';
+	}
+	dst[i] = '\0';
+}
+
 static void handleAuthenticate(struct Message *msg) {
 	(void)msg;
 	if (!self.plain) {