+
+/*
+ * This function's counterpart, yaz_base64decode(), is in srwutil.c.
+ * I feel bad that they're not together, but each function is only
+ * needed in one place, and those places are not together. Maybe one
+ * day we'll move them into a new httputil.c, and declare them in a
+ * corresponding httputil.h
+ */
+static void yaz_base64encode(const char *in, char *out)
+{
+ static char encoding[] =
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ unsigned char buf[3];
+ long n;
+
+ while (*in != 0) {
+ char *pad = 0;
+ buf[0] = in[0];
+ buf[1] = in[1];
+ if (in[1] == 0) {
+ buf[2] = 0;
+ pad = "==";
+ } else {
+ buf[2] = in[2];
+ if (in[2] == 0)
+ pad = "=";
+ }
+
+ /* Treat three eight-bit numbers as on 24-bit number */
+ n = (buf[0] << 16) + (buf[1] << 8) + buf[2];
+
+ /* Write the six-bit chunks out as four encoded characters */
+ *out++ = encoding[(n >> 18) & 63];
+ *out++ = encoding[(n >> 12) & 63];
+ if (in[1] != 0)
+ *out++ = encoding[(n >> 6) & 63];
+ if (in[1] != 0 && in[2] != 0)
+ *out++ = encoding[n & 63];
+
+ if (pad != 0) {
+ while (*pad != 0)
+ *out++ = *pad++;
+ break;
+ }
+ in += 3;
+ }
+
+ *out++ = 0;
+}
+
+