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
31CBC_Base256Encoder::CBC_Base256Encoder() {}
32CBC_Base256Encoder::~CBC_Base256Encoder() {}
33int32_t CBC_Base256Encoder::getEncodingMode() {
34  return BASE256_ENCODATION;
35}
36void 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}
78FX_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