添加项目文件。

zxing.core/xx/datamatrix/encoder/EdifactEncoder.cs

@@ -0,0 +1,165 @@
+/*
+ * Copyright 2006-2007 Jeremias Maerki.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+using System;
+using System.Text;
+
+namespace ZXing.Datamatrix.Encoder
+{
+   internal sealed class EdifactEncoder : Encoder
+   {
+      public int EncodingMode
+      {
+         get { return Encodation.EDIFACT; }
+      }
+
+      public void encode(EncoderContext context)
+      {
+         //step F
+         var buffer = new StringBuilder();
+         while (context.HasMoreCharacters)
+         {
+            char c = context.CurrentChar;
+            encodeChar(c, buffer);
+            context.Pos++;
+
+            int count = buffer.Length;
+            if (count >= 4)
+            {
+               context.writeCodewords(encodeToCodewords(buffer, 0));
+               buffer.Remove(0, 4);
+
+               int newMode = HighLevelEncoder.lookAheadTest(context.Message, context.Pos, EncodingMode);
+               if (newMode != EncodingMode)
+               {
+                  context.signalEncoderChange(Encodation.ASCII);
+                  break;
+               }
+            }
+         }
+         buffer.Append((char)31); //Unlatch
+         handleEOD(context, buffer);
+      }
+
+      /// <summary>
+      /// Handle "end of data" situations
+      /// </summary>
+      /// <param name="context">the encoder context</param>
+      /// <param name="buffer">the buffer with the remaining encoded characters</param>
+      private static void handleEOD(EncoderContext context, StringBuilder buffer)
+      {
+         try
+         {
+            int count = buffer.Length;
+            if (count == 0)
+            {
+               return; //Already finished
+            }
+            if (count == 1)
+            {
+               //Only an unlatch at the end
+               context.updateSymbolInfo();
+               int available = context.SymbolInfo.dataCapacity - context.CodewordCount;
+               int remaining = context.RemainingCharacters;
+               if (remaining == 0 && available <= 2)
+               {
+                  return; //No unlatch
+               }
+            }
+
+            if (count > 4)
+            {
+               throw new InvalidOperationException("Count must not exceed 4");
+            }
+            int restChars = count - 1;
+            String encoded = encodeToCodewords(buffer, 0);
+            bool endOfSymbolReached = !context.HasMoreCharacters;
+            bool restInAscii = endOfSymbolReached && restChars <= 2;
+
+            if (restChars <= 2)
+            {
+               context.updateSymbolInfo(context.CodewordCount + restChars);
+               int available = context.SymbolInfo.dataCapacity - context.CodewordCount;
+               if (available >= 3)
+               {
+                  restInAscii = false;
+                  context.updateSymbolInfo(context.CodewordCount + encoded.Length);
+                  //available = context.symbolInfo.dataCapacity - context.getCodewordCount();
+               }
+            }
+
+            if (restInAscii)
+            {
+               context.resetSymbolInfo();
+               context.Pos -= restChars;
+            }
+            else
+            {
+               context.writeCodewords(encoded);
+            }
+         }
+         finally
+         {
+            context.signalEncoderChange(Encodation.ASCII);
+         }
+      }
+
+      private static void encodeChar(char c, StringBuilder sb)
+      {
+         if (c >= ' ' && c <= '?')
+         {
+            sb.Append(c);
+         }
+         else if (c >= '@' && c <= '^')
+         {
+            sb.Append((char)(c - 64));
+         }
+         else
+         {
+            HighLevelEncoder.illegalCharacter(c);
+         }
+      }
+
+      private static String encodeToCodewords(StringBuilder sb, int startPos)
+      {
+         int len = sb.Length - startPos;
+         if (len == 0)
+         {
+            throw new InvalidOperationException("StringBuilder must not be empty");
+         }
+         char c1 = sb[startPos];
+         char c2 = len >= 2 ? sb[startPos + 1] : (char)0;
+         char c3 = len >= 3 ? sb[startPos + 2] : (char)0;
+         char c4 = len >= 4 ? sb[startPos + 3] : (char)0;
+
+         int v = (c1 << 18) + (c2 << 12) + (c3 << 6) + c4;
+         char cw1 = (char)((v >> 16) & 255);
+         char cw2 = (char)((v >> 8) & 255);
+         char cw3 = (char)(v & 255);
+         var res = new StringBuilder(3);
+         res.Append(cw1);
+         if (len >= 2)
+         {
+            res.Append(cw2);
+         }
+         if (len >= 3)
+         {
+            res.Append(cw3);
+         }
+         return res.ToString();
+      }
+   }
+}