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+/*
+* Base64 Encoder/Decoder
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_BASE64_H__
+#define BOTAN_BASE64_H__
+
+#include <botan/filter.h>
+
+namespace Botan {
+
+/**
+* This class represents a Base64 encoder.
+*/
+class BOTAN_DLL Base64_Encoder : public Filter
+ {
+ public:
+ static void encode(const byte in[3], byte out[4]);
+
+ /**
+ * Input a part of a message to the encoder.
+ * @param input the message to input as a byte array
+ * @param length the length of the byte array input
+ */
+ void write(const byte input[], u32bit length);
+
+ /**
+ * Inform the Encoder that the current message shall be closed.
+ */
+ void end_msg();
+
+ /**
+ * Create a base64 encoder.
+ * @param breaks whether to use line breaks in the Streamcipheroutput
+ * @param length the length of the lines of the output
+ * @param t_n whether to use a trailing newline
+ */
+ Base64_Encoder(bool breaks = false, u32bit length = 72,
+ bool t_n = false);
+ private:
+ void encode_and_send(const byte[], u32bit);
+ void do_output(const byte[], u32bit);
+ static const byte BIN_TO_BASE64[64];
+
+ const u32bit line_length;
+ const bool trailing_newline;
+ SecureVector<byte> in, out;
+ u32bit position, counter;
+ };
+
+/**
+* This object represents a Base64 decoder.
+*/
+class BOTAN_DLL Base64_Decoder : public Filter
+ {
+ public:
+ static void decode(const byte input[4], byte output[3]);
+
+ static bool is_valid(byte);
+
+ /**
+ * Input a part of a message to the decoder.
+ * @param input the message to input as a byte array
+ * @param length the length of the byte array input
+ */
+ void write(const byte input[], u32bit length);
+
+ /**
+ * Inform the Encoder that the current message shall be closed.
+ */
+ void end_msg();
+
+ /**
+ * Create a base64 encoder.
+ * @param checking the type of checking that shall be performed by
+ * the decoder
+ */
+ Base64_Decoder(Decoder_Checking checking = NONE);
+ private:
+ void decode_and_send(const byte[], u32bit);
+ void handle_bad_char(byte);
+ static const byte BASE64_TO_BIN[256];
+
+ const Decoder_Checking checking;
+ SecureVector<byte> in, out;
+ u32bit position;
+ };
+
+}
+
+#endif