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      1 // Copyright 2014 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 // Original code is licensed as follows:
      7 /*
      8  * Copyright 2006-2007 Jeremias Maerki.
      9  *
     10  * Licensed under the Apache License, Version 2.0 (the "License");
     11  * you may not use this file except in compliance with the License.
     12  * You may obtain a copy of the License at
     13  *
     14  *      http://www.apache.org/licenses/LICENSE-2.0
     15  *
     16  * Unless required by applicable law or agreed to in writing, software
     17  * distributed under the License is distributed on an "AS IS" BASIS,
     18  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     19  * See the License for the specific language governing permissions and
     20  * limitations under the License.
     21  */
     22 
     23 #include "xfa/fxbarcode/BC_Dimension.h"
     24 #include "xfa/fxbarcode/datamatrix/BC_Base256Encoder.h"
     25 #include "xfa/fxbarcode/datamatrix/BC_Encoder.h"
     26 #include "xfa/fxbarcode/datamatrix/BC_EncoderContext.h"
     27 #include "xfa/fxbarcode/datamatrix/BC_HighLevelEncoder.h"
     28 #include "xfa/fxbarcode/datamatrix/BC_SymbolInfo.h"
     29 #include "xfa/fxbarcode/datamatrix/BC_SymbolShapeHint.h"
     30 
     31 CBC_Base256Encoder::CBC_Base256Encoder() {}
     32 CBC_Base256Encoder::~CBC_Base256Encoder() {}
     33 int32_t CBC_Base256Encoder::getEncodingMode() {
     34   return BASE256_ENCODATION;
     35 }
     36 void CBC_Base256Encoder::Encode(CBC_EncoderContext& context, int32_t& e) {
     37   CFX_WideString buffer;
     38   buffer += (FX_WCHAR)'\0';
     39   while (context.hasMoreCharacters()) {
     40     FX_WCHAR c = context.getCurrentChar();
     41     buffer += c;
     42     context.m_pos++;
     43     int32_t newMode = CBC_HighLevelEncoder::lookAheadTest(
     44         context.m_msg, context.m_pos, getEncodingMode());
     45     if (newMode != getEncodingMode()) {
     46       context.signalEncoderChange(newMode);
     47       break;
     48     }
     49   }
     50   int32_t dataCount = buffer.GetLength() - 1;
     51   FX_CHAR buf[128];
     52   FXSYS_itoa(dataCount, buf, 10);
     53   buffer.SetAt(0, FX_WCHAR(*buf) - '0');
     54   int32_t lengthFieldSize = 1;
     55   int32_t currentSize =
     56       context.getCodewordCount() + dataCount + lengthFieldSize;
     57   context.updateSymbolInfo(currentSize, e);
     58   if (e != BCExceptionNO) {
     59     return;
     60   }
     61   bool mustPad = (context.m_symbolInfo->m_dataCapacity - currentSize) > 0;
     62   if (context.hasMoreCharacters() || mustPad) {
     63     if (dataCount <= 249) {
     64       buffer.SetAt(0, (FX_WCHAR)dataCount);
     65     } else if (dataCount > 249 && dataCount <= 1555) {
     66       buffer.SetAt(0, (FX_WCHAR)((dataCount / 250) + 249));
     67       buffer.Insert(1, (FX_WCHAR)(dataCount % 250));
     68     } else {
     69       e = BCExceptionIllegalStateMessageLengthInvalid;
     70       return;
     71     }
     72   }
     73   for (int32_t i = 0, c = buffer.GetLength(); i < c; i++) {
     74     context.writeCodeword(
     75         randomize255State(buffer.GetAt(i), context.getCodewordCount() + 1));
     76   }
     77 }
     78 FX_WCHAR CBC_Base256Encoder::randomize255State(FX_WCHAR ch,
     79                                                int32_t codewordPosition) {
     80   int32_t pseudoRandom = ((149 * codewordPosition) % 255) + 1;
     81   int32_t tempVariable = ch + pseudoRandom;
     82   if (tempVariable <= 255) {
     83     return (FX_WCHAR)tempVariable;
     84   } else {
     85     return (FX_WCHAR)(tempVariable - 256);
     86   }
     87 }
     88