1 files changed, 50 insertions, 0 deletions

diff --git a/lib/base64.c b/lib/base64.c
new file mode 100644
index 0000000..1f1fcb8
--- /dev/null
+++ b/lib/base64.c
@@ -0,0 +1,50 @@
+/****************************************************************************
+* Function to encode in Base64
+*
+* Written by Lauri Alanko
+*
+*****************************************************************************/
+
+#include "common.h"
+#include "base64.h"
+
+char *
+base64 (const char *bin, size_t len)
+{
+
+        char *buf = (char *) malloc ((len + 2) / 3 * 4 + 1);
+        size_t i = 0, j = 0;
+
+        char BASE64_END = '=';
+        char base64_table[64];
+        strncpy (base64_table, "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/", 64);
+
+        while (j < len - 2) {
+                buf[i++] = base64_table[bin[j] >> 2];
+                buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
+                buf[i++] = base64_table[((bin[j + 1] & 15) << 2) | (bin[j + 2] >> 6)];
+                buf[i++] = base64_table[bin[j + 2] & 63];
+                j += 3;
+        }
+
+        switch (len - j) {
+        case 1:
+                buf[i++] = base64_table[bin[j] >> 2];
+                buf[i++] = base64_table[(bin[j] & 3) << 4];
+                buf[i++] = BASE64_END;
+                buf[i++] = BASE64_END;
+                break;
+        case 2:
+                buf[i++] = base64_table[bin[j] >> 2];
+                buf[i++] = base64_table[((bin[j] & 3) << 4) | (bin[j + 1] >> 4)];
+                buf[i++] = base64_table[(bin[j + 1] & 15) << 2];
+                buf[i++] = BASE64_END;
+                break;
+        case 0:
+                break;
+        }
+
+        buf[i] = '\0';
+        return buf;
+}
+