1 files changed, 191 insertions, 0 deletions
diff --git a/botan/src/codec/hex/hex.cpp b/botan/src/codec/hex/hex.cpp
new file mode 100644
index 0000000..fbacc27
--- /dev/null
+++ b/botan/src/codec/hex/hex.cpp
@@ -0,0 +1,191 @@
+/*
+* Hex Encoder/Decoder
+* (C) 1999-2007 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#include <botan/hex.h>
+#include <botan/parsing.h>
+#include <botan/charset.h>
+#include <botan/exceptn.h>
+#include <algorithm>
+
+namespace Botan {
+
+/*
+* Hex_Encoder Constructor
+*/
+Hex_Encoder::Hex_Encoder(bool breaks, u32bit length, Case c) :
+   casing(c), line_length(breaks ? length : 0)
+   {
+   in.create(64);
+   out.create(2*in.size());
+   counter = position = 0;
+   }
+
+/*
+* Hex_Encoder Constructor
+*/
+Hex_Encoder::Hex_Encoder(Case c) : casing(c), line_length(0)
+   {
+   in.create(64);
+   out.create(2*in.size());
+   counter = position = 0;
+   }
+
+/*
+* Hex Encoding Operation
+*/
+void Hex_Encoder::encode(byte in, byte out[2], Hex_Encoder::Case casing)
+   {
+   const byte* BIN_TO_HEX = ((casing == Uppercase) ? BIN_TO_HEX_UPPER :
+                                                     BIN_TO_HEX_LOWER);
+
+   out[0] = BIN_TO_HEX[((in >> 4) & 0x0F)];
+   out[1] = BIN_TO_HEX[((in     ) & 0x0F)];
+   }
+
+/*
+* Encode and send a block
+*/
+void Hex_Encoder::encode_and_send(const byte block[], u32bit length)
+   {
+   for(u32bit j = 0; j != length; ++j)
+      encode(block[j], out + 2*j, casing);
+
+   if(line_length == 0)
+      send(out, 2*length);
+   else
+      {
+      u32bit remaining = 2*length, offset = 0;
+      while(remaining)
+         {
+         u32bit sent = std::min(line_length - counter, remaining);
+         send(out + offset, sent);
+         counter += sent;
+         remaining -= sent;
+         offset += sent;
+         if(counter == line_length)
+            {
+            send('\n');
+            counter = 0;
+            }
+         }
+      }
+   }
+
+/*
+* Convert some data into hex format
+*/
+void Hex_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 Hex_Encoder::end_msg()
+   {
+   encode_and_send(in, position);
+   if(counter && line_length)
+      send('\n');
+   counter = position = 0;
+   }
+
+/*
+* Hex_Decoder Constructor
+*/
+Hex_Decoder::Hex_Decoder(Decoder_Checking c) : checking(c)
+   {
+   in.create(64);
+   out.create(in.size() / 2);
+   position = 0;
+   }
+
+/*
+* Check if a character is a valid hex char
+*/
+bool Hex_Decoder::is_valid(byte in)
+   {
+   return (HEX_TO_BIN[in] != 0x80);
+   }
+
+/*
+* Handle processing an invalid character
+*/
+void Hex_Decoder::handle_bad_char(byte c)
+   {
+   if(checking == NONE)
+      return;
+
+   if((checking == IGNORE_WS) && Charset::is_space(c))
+      return;
+
+   throw Decoding_Error("Hex_Decoder: Invalid hex character: " +
+                        to_string(c));
+   }
+
+/*
+* Hex Decoding Operation
+*/
+byte Hex_Decoder::decode(const byte hex[2])
+   {
+   return ((HEX_TO_BIN[hex[0]] << 4) | HEX_TO_BIN[hex[1]]);
+   }
+
+/*
+* Decode and send a block
+*/
+void Hex_Decoder::decode_and_send(const byte block[], u32bit length)
+   {
+   for(u32bit j = 0; j != length / 2; ++j)
+      out[j] = decode(block + 2*j);
+   send(out, length / 2);
+   }
+
+/*
+* Convert some data from hex format
+*/
+void Hex_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 Hex_Decoder::end_msg()
+   {
+   decode_and_send(in, position);
+   position = 0;
+   }
+
+}