添加项目文件。

zxing.core/xx/datamatrix/encoder/Base256Encoder.cs

@@ -0,0 +1,90 @@
+/*
+ * 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 Base256Encoder : Encoder
+   {
+      public int EncodingMode
+      {
+         get { return Encodation.BASE256; }
+      }
+
+      public void encode(EncoderContext context)
+      {
+         var buffer = new StringBuilder();
+         buffer.Append('\u0000'); //Initialize length field
+         while (context.HasMoreCharacters)
+         {
+            char c = context.CurrentChar;
+            buffer.Append(c);
+
+            context.Pos++;
+
+            int newMode = HighLevelEncoder.lookAheadTest(context.Message, context.Pos, EncodingMode);
+            if (newMode != EncodingMode)
+            {
+               context.signalEncoderChange(newMode);
+               break;
+            }
+         }
+         int dataCount = buffer.Length - 1;
+         const int lengthFieldSize = 1;
+         int currentSize = context.CodewordCount + dataCount + lengthFieldSize;
+         context.updateSymbolInfo(currentSize);
+         bool mustPad = (context.SymbolInfo.dataCapacity - currentSize) > 0;
+         if (context.HasMoreCharacters || mustPad)
+         {
+            if (dataCount <= 249)
+            {
+               buffer[0] = (char)dataCount;
+            }
+            else if (dataCount > 249 && dataCount <= 1555)
+            {
+               buffer[0] = (char)((dataCount / 250) + 249);
+               buffer.Insert(1, new [] { (char)(dataCount % 250) });
+            }
+            else
+            {
+               throw new InvalidOperationException(
+                   "Message length not in valid ranges: " + dataCount);
+            }
+         }
+         {
+            var c = buffer.Length;
+            for (int i = 0; i < c; i++)
+            {
+               context.writeCodeword(randomize255State(
+                  buffer[i], context.CodewordCount + 1));
+            }
+         }
+      }
+
+      private static char randomize255State(char ch, int codewordPosition)
+      {
+         int pseudoRandom = ((149 * codewordPosition) % 255) + 1;
+         int tempVariable = ch + pseudoRandom;
+         if (tempVariable <= 255)
+         {
+            return (char)tempVariable;
+         }
+         return (char)(tempVariable - 256);
+      }
+   }
+}