Initial checkin1.5.6

1 files changed, 218 insertions, 0 deletions

diff --git a/src/base64.cpp b/src/base64.cpp
new file mode 100644
index 000000000..22c6d78c5
--- /dev/null
+++ b/src/base64.cpp
@@ -0,0 +1,218 @@
+/*************************************************
+* Base64 Encoder/Decoder Source File             *
+* (C) 1999-2006 The Botan Project                *
+*************************************************/
+
+#include <botan/base64.h>
+#include <botan/charset.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*************************************************
+* Base64_Encoder Constructor                     *
+*************************************************/
+Base64_Encoder::Base64_Encoder(bool breaks, u32bit length) :
+   line_length(breaks ? length : 0)
+   {
+   in.create(48);
+   out.create(4);
+
+   counter = position = 0;
+   }
+
+/*************************************************
+* Base64 Encoding Operation                      *
+*************************************************/
+void Base64_Encoder::encode(const byte in[3], byte out[4])
+   {
+   out[0] = BIN_TO_BASE64[((in[0] & 0xFC) >> 2)];
+   out[1] = BIN_TO_BASE64[((in[0] & 0x03) << 4) | (in[1] >> 4)];
+   out[2] = BIN_TO_BASE64[((in[1] & 0x0F) << 2) | (in[2] >> 6)];
+   out[3] = BIN_TO_BASE64[((in[2] & 0x3F)     )];
+   }
+
+/*************************************************
+* Encode and send a block                        *
+*************************************************/
+void Base64_Encoder::encode_and_send(const byte block[], u32bit length)
+   {
+   for(u32bit j = 0; j != length; j += 3)
+      {
+      encode(block + j, out);
+      do_output(out, 4);
+      }
+   }
+
+/*************************************************
+* Handle the output                              *
+*************************************************/
+void Base64_Encoder::do_output(const byte input[], u32bit length)
+   {
+   if(line_length == 0)
+      send(input, length);
+   else
+      {
+      u32bit remaining = length, offset = 0;
+      while(remaining)
+         {
+         u32bit sent = std::min(line_length - counter, remaining);
+         send(input + offset, sent);
+         counter += sent;
+         remaining -= sent;
+         offset += sent;
+         if(counter == line_length)
+            {
+            send('\n');
+            counter = 0;
+            }
+         }
+      }
+   }
+
+/*************************************************
+* Convert some data into Base64                  *
+*************************************************/
+void Base64_Encoder::write(const byte input[], u32bit length)
+   {
+   in.copy(position, input, length);
+   if(position + length >= in.size())
+      {
+      encode_and_send(in, in.size());
+      input += (in.size() - position);
+      length -= (in.size() - position);
+      while(length >= in.size())
+         {
+         encode_and_send(input, in.size());
+         input += in.size();
+         length -= in.size();
+         }
+      in.copy(input, length);
+      position = 0;
+      }
+   position += length;
+   }
+
+/*************************************************
+* Flush buffers                                  *
+*************************************************/
+void Base64_Encoder::end_msg()
+   {
+   u32bit start_of_last_block = 3 * (position / 3),
+          left_over = position % 3;
+   encode_and_send(in, start_of_last_block);
+
+   if(left_over)
+      {
+      SecureBuffer<byte, 3> remainder(in + start_of_last_block, left_over);
+
+      encode(remainder, out);
+
+      u32bit empty_bits = 8 * (3 - left_over), index = 4 - 1;
+      while(empty_bits >= 8)
+         {
+         out[index--] = '=';
+         empty_bits -= 6;
+         }
+
+      do_output(out, 4);
+      }
+
+   if(counter && line_length)
+      send('\n');
+
+   counter = position = 0;
+   }
+
+/*************************************************
+* Base64_Decoder Constructor                     *
+*************************************************/
+Base64_Decoder::Base64_Decoder(Decoder_Checking c) : checking(c)
+   {
+   in.create(48);
+   out.create(3);
+   position = 0;
+   }
+
+/*************************************************
+* Check if a character is a valid Base64 char    *
+*************************************************/
+bool Base64_Decoder::is_valid(byte in)
+   {
+   return (BASE64_TO_BIN[in] != 0x80);
+   }
+
+/*************************************************
+* Base64 Decoding Operation                      *
+*************************************************/
+void Base64_Decoder::decode(const byte in[4], byte out[3])
+   {
+   out[0] = (byte)((BASE64_TO_BIN[in[0]] << 2) | (BASE64_TO_BIN[in[1]] >> 4));
+   out[1] = (byte)((BASE64_TO_BIN[in[1]] << 4) | (BASE64_TO_BIN[in[2]] >> 2));
+   out[2] = (byte)((BASE64_TO_BIN[in[2]] << 6) | (BASE64_TO_BIN[in[3]]));
+   }
+
+/*************************************************
+* Decode and send a block                        *
+*************************************************/
+void Base64_Decoder::decode_and_send(const byte block[], u32bit length)
+   {
+   for(u32bit j = 0; j != length; j += 4)
+      {
+      decode(block + j, out);
+      send(out, 3);
+      }
+   }
+
+/*************************************************
+* Handle processing an invalid character         *
+*************************************************/
+void Base64_Decoder::handle_bad_char(byte c)
+   {
+   if(checking == NONE) return;
+   if((checking == IGNORE_WS) && is_space(c)) return;
+   throw Decoding_Error("Base64_Decoder: Invalid base64 character: " + c);
+   }
+
+/*************************************************
+* Convert some data from Base64                  *
+*************************************************/
+void Base64_Decoder::write(const byte input[], u32bit length)
+   {
+   for(u32bit j = 0; j != length; ++j)
+      {
+      if(is_valid(input[j]))
+         in[position++] = input[j];
+      else
+         handle_bad_char(input[j]);
+
+      if(position == in.size())
+         {
+         decode_and_send(in, in.size());
+         position = 0;
+         }
+      }
+   }
+
+/*************************************************
+* Flush buffers                                  *
+*************************************************/
+void Base64_Decoder::end_msg()
+   {
+   if(position != 0)
+      {
+      u32bit start_of_last_block = 4 * (position / 4),
+             left_over = position % 4;
+      decode_and_send(in, start_of_last_block);
+
+      if(left_over)
+         {
+         SecureBuffer<byte, 4> remainder(in + start_of_last_block, left_over);
+         decode(remainder, out);
+         send(out, ((left_over == 1) ? (1) : (left_over - 1)));
+         }
+      }
+   position = 0;
+   }
+
+}