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+/*
+ * Off-the-Record Messaging library
+ * Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew,
+ * Nikita Borisov
+ * <otr@cypherpunks.ca>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of version 2.1 of the GNU Lesser General
+ * Public License as published by the Free Software Foundation.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __B64_H__
+#define __B64_H__
+
+#include <stdlib.h>
+
+/* Base64 encodes blocks of this many bytes: */
+#define OTRL_B64_DECODED_LEN 3
+/* into blocks of this many bytes: */
+#define OTRL_B64_ENCODED_LEN 4
+
+/* An encoded block of length encoded_len can turn into a maximum of
+ * this many decoded bytes: */
+#define OTRL_B64_MAX_DECODED_SIZE(encoded_len) \
+ (((encoded_len + OTRL_B64_ENCODED_LEN - 1) / OTRL_B64_ENCODED_LEN) \
+ * OTRL_B64_DECODED_LEN)
+
+/*
+ * base64 encode data. Insert no linebreaks or whitespace.
+ *
+ * The buffer base64data must contain at least ((datalen+2)/3)*4 bytes of
+ * space. This function will return the number of bytes actually used.
+ */
+size_t otrl_base64_encode(char *base64data, const unsigned char *data,
+ size_t datalen);
+
+/*
+ * base64 decode data. Skip non-base64 chars, and terminate at the
+ * first '=', or the end of the buffer.
+ *
+ * The buffer data must contain at least ((base64len+3) / 4) * 3 bytes
+ * of space. This function will return the number of bytes actually
+ * used.
+ */
+size_t otrl_base64_decode(unsigned char *data, const char *base64data,
+ size_t base64len);
+
+/*
+ * Base64-encode a block of data, stick "?OTR:" and "." around it, and
+ * return the result, or NULL in the event of a memory error.
+ */
+char *otrl_base64_otr_encode(const unsigned char *buf, size_t buflen);
+
+/*
+ * Base64-decode the portion of the given message between "?OTR:" and
+ * ".". Set *bufp to the decoded data, and set *lenp to its length.
+ * The caller must free() the result. Return 0 on success, -1 on a
+ * memory error, or -2 on invalid input.
+ */
+int otrl_base64_otr_decode(const char *msg, unsigned char **bufp,
+ size_t *lenp);
+
+#endif