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 "fxbarcode/datamatrix/BC_ASCIIEncoder.h"
24
25#include "fxbarcode/datamatrix/BC_Encoder.h"
26#include "fxbarcode/datamatrix/BC_EncoderContext.h"
27#include "fxbarcode/datamatrix/BC_HighLevelEncoder.h"
28#include "fxbarcode/datamatrix/BC_SymbolInfo.h"
29#include "fxbarcode/utils.h"
30
31CBC_ASCIIEncoder::CBC_ASCIIEncoder() {}
32CBC_ASCIIEncoder::~CBC_ASCIIEncoder() {}
33int32_t CBC_ASCIIEncoder::getEncodingMode() {
34  return ASCII_ENCODATION;
35}
36void CBC_ASCIIEncoder::Encode(CBC_EncoderContext& context, int32_t& e) {
37  int32_t n = CBC_HighLevelEncoder::determineConsecutiveDigitCount(
38      context.m_msg, context.m_pos);
39  if (n >= 2) {
40    wchar_t code = encodeASCIIDigits(context.m_msg[context.m_pos],
41                                     context.m_msg[context.m_pos + 1], e);
42    if (e != BCExceptionNO) {
43      return;
44    }
45    context.writeCodeword(code);
46    context.m_pos += 2;
47  } else {
48    wchar_t c = context.getCurrentChar();
49    int32_t newMode = CBC_HighLevelEncoder::lookAheadTest(
50        context.m_msg, context.m_pos, getEncodingMode());
51    if (newMode != getEncodingMode()) {
52      switch (newMode) {
53        case BASE256_ENCODATION:
54          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_BASE256);
55          context.signalEncoderChange(BASE256_ENCODATION);
56          return;
57        case C40_ENCODATION:
58          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_C40);
59          context.signalEncoderChange(C40_ENCODATION);
60          return;
61        case X12_ENCODATION:
62          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_ANSIX12);
63          context.signalEncoderChange(X12_ENCODATION);
64          break;
65        case TEXT_ENCODATION:
66          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_TEXT);
67          context.signalEncoderChange(TEXT_ENCODATION);
68          break;
69        case EDIFACT_ENCODATION:
70          context.writeCodeword(CBC_HighLevelEncoder::LATCH_TO_EDIFACT);
71          context.signalEncoderChange(EDIFACT_ENCODATION);
72          break;
73        default:
74          e = BCExceptionIllegalStateIllegalMode;
75          return;
76      }
77    } else if (CBC_HighLevelEncoder::isExtendedASCII(c)) {
78      context.writeCodeword(CBC_HighLevelEncoder::UPPER_SHIFT);
79      context.writeCodeword((wchar_t)(c - 128 + 1));
80      context.m_pos++;
81    } else {
82      context.writeCodeword((wchar_t)(c + 1));
83      context.m_pos++;
84    }
85  }
86}
87wchar_t CBC_ASCIIEncoder::encodeASCIIDigits(wchar_t digit1,
88                                            wchar_t digit2,
89                                            int32_t& e) {
90  if (CBC_HighLevelEncoder::isDigit(digit1) &&
91      CBC_HighLevelEncoder::isDigit(digit2)) {
92    int32_t num = (digit1 - 48) * 10 + (digit2 - 48);
93    return (wchar_t)(num + 130);
94  }
95  e = BCExceptionIllegalArgumentNotGigits;
96  return 0;
97}
98