fxbarcode/datamatrix/BC_ASCIIEncoder.cpp

// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
// Original code is licensed as follows:
/*
 * 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.
 */

#include "fxbarcode/datamatrix/BC_ASCIIEncoder.h"

#include "fxbarcode/datamatrix/BC_Encoder.h"
#include "fxbarcode/datamatrix/BC_EncoderContext.h"
#include "fxbarcode/datamatrix/BC_HighLevelEncoder.h"
#include "fxbarcode/datamatrix/BC_SymbolInfo.h"
#include "fxbarcode/utils.h"

CBC_ASCIIEncoder::CBC_ASCIIEncoder() {}
CBC_ASCIIEncoder::~CBC_ASCIIEncoder() {}
int32_t CBC_ASCIIEncoder::getEncodingMode() {
  return ASCII_ENCODATION;
}
void CBC_ASCIIEncoder::Encode(CBC_EncoderContext& context, int32_t& e) {
  int32_t n = CBC_HighLevelEncoder::determineConsecutiveDigitCount(
      context.m_msg, context.m_pos);
  if (n >= 2) {
    wchar_t code = encodeASCIIDigits(context.m_msg.GetAt(context.m_pos),
                                     context.m_msg.GetAt(context.m_pos + 1), e);
    if (e != BCExceptionNO) {
      return;
    }
    context.writeCodeword(code);
    context.m_pos += 2;
  } else {
    wchar_t c = context.getCurrentChar();
    int32_t newMode = CBC_HighLevelEncoder::lookAheadTest(
        context.m_msg, context.m_pos, getEncodingMode());
    if (newMode != getEncodingMode()) {
      switch (newMode) {
        case BASE256_ENCODATION:
          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_BASE256);
          context.signalEncoderChange(BASE256_ENCODATION);
          return;
        case C40_ENCODATION:
          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_C40);
          context.signalEncoderChange(C40_ENCODATION);
          return;
        case X12_ENCODATION:
          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_ANSIX12);
          context.signalEncoderChange(X12_ENCODATION);
          break;
        case TEXT_ENCODATION:
          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_TEXT);
          context.signalEncoderChange(TEXT_ENCODATION);
          break;
        case EDIFACT_ENCODATION:
          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_EDIFACT);
          context.signalEncoderChange(EDIFACT_ENCODATION);
          break;
        default:
          e = BCExceptionIllegalStateIllegalMode;
          return;
      }
    } else if (CBC_HighLevelEncoder::isExtendedASCII(c)) {
      context.writeCodeword(CBC_HighLevelEncoder::UPPER_SHIFT);
      context.writeCodeword((wchar_t)(c - 128 + 1));
      context.m_pos++;
    } else {
      context.writeCodeword((wchar_t)(c + 1));
      context.m_pos++;
    }
  }
}
wchar_t CBC_ASCIIEncoder::encodeASCIIDigits(wchar_t digit1,
                                            wchar_t digit2,
                                            int32_t& e) {
  if (CBC_HighLevelEncoder::isDigit(digit1) &&
      CBC_HighLevelEncoder::isDigit(digit2)) {
    int32_t num = (digit1 - 48) * 10 + (digit2 - 48);
    return (wchar_t)(num + 130);
  }
  e = BCExceptionIllegalArgumentNotGigits;
  return 0;
}