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_C40Encoder.h"
24
25 #include "core/fxcrt/fx_extension.h"
26 #include "fxbarcode/common/BC_CommonBitMatrix.h"
27 #include "fxbarcode/datamatrix/BC_Encoder.h"
28 #include "fxbarcode/datamatrix/BC_EncoderContext.h"
29 #include "fxbarcode/datamatrix/BC_HighLevelEncoder.h"
30 #include "fxbarcode/datamatrix/BC_SymbolInfo.h"
31
32 namespace {
33
EncodeToC40Codewords(const WideString & sb)34 WideString EncodeToC40Codewords(const WideString& sb) {
35 wchar_t c1 = sb[0];
36 wchar_t c2 = sb[1];
37 wchar_t c3 = sb[2];
38 int32_t v = (1600 * c1) + (40 * c2) + c3 + 1;
39 wchar_t cw[2];
40 cw[0] = static_cast<wchar_t>(v / 256);
41 cw[1] = static_cast<wchar_t>(v % 256);
42 return WideString(cw, FX_ArraySize(cw));
43 }
44
45 } // namespace
46
47 CBC_C40Encoder::CBC_C40Encoder() = default;
48
49 CBC_C40Encoder::~CBC_C40Encoder() = default;
50
GetEncodingMode()51 CBC_HighLevelEncoder::Encoding CBC_C40Encoder::GetEncodingMode() {
52 return CBC_HighLevelEncoder::Encoding::C40;
53 }
54
Encode(CBC_EncoderContext * context)55 bool CBC_C40Encoder::Encode(CBC_EncoderContext* context) {
56 WideString buffer;
57 while (context->hasMoreCharacters()) {
58 wchar_t c = context->getCurrentChar();
59 context->m_pos++;
60 int32_t lastCharSize = EncodeChar(c, &buffer);
61 if (lastCharSize <= 0)
62 return false;
63
64 size_t unwritten = (buffer.GetLength() / 3) * 2;
65 int32_t curCodewordCount = context->getCodewordCount() + unwritten;
66 if (!context->UpdateSymbolInfo(curCodewordCount))
67 return false;
68
69 int32_t available =
70 context->m_symbolInfo->dataCapacity() - curCodewordCount;
71 if (!context->hasMoreCharacters()) {
72 if ((buffer.GetLength() % 3) == 2) {
73 if (available < 2 || available > 2) {
74 lastCharSize = BacktrackOneCharacter(context, &buffer, lastCharSize);
75 if (lastCharSize < 0)
76 return false;
77 }
78 }
79 while ((buffer.GetLength() % 3) == 1 &&
80 ((lastCharSize <= 3 && available != 1) || lastCharSize > 3)) {
81 lastCharSize = BacktrackOneCharacter(context, &buffer, lastCharSize);
82 if (lastCharSize < 0)
83 return false;
84 }
85 break;
86 }
87 size_t count = buffer.GetLength();
88 if ((count % 3) == 0) {
89 CBC_HighLevelEncoder::Encoding newMode =
90 CBC_HighLevelEncoder::LookAheadTest(context->m_msg, context->m_pos,
91 GetEncodingMode());
92 if (newMode != GetEncodingMode()) {
93 context->SignalEncoderChange(newMode);
94 break;
95 }
96 }
97 }
98 return HandleEOD(context, &buffer);
99 }
100
WriteNextTriplet(CBC_EncoderContext * context,WideString * buffer)101 void CBC_C40Encoder::WriteNextTriplet(CBC_EncoderContext* context,
102 WideString* buffer) {
103 context->writeCodewords(EncodeToC40Codewords(*buffer));
104 buffer->Delete(0, 3);
105 }
106
HandleEOD(CBC_EncoderContext * context,WideString * buffer)107 bool CBC_C40Encoder::HandleEOD(CBC_EncoderContext* context,
108 WideString* buffer) {
109 size_t unwritten = (buffer->GetLength() / 3) * 2;
110 size_t rest = buffer->GetLength() % 3;
111 int32_t curCodewordCount = context->getCodewordCount() + unwritten;
112 if (!context->UpdateSymbolInfo(curCodewordCount))
113 return false;
114
115 int32_t available = context->m_symbolInfo->dataCapacity() - curCodewordCount;
116 if (rest == 2) {
117 *buffer += (wchar_t)'\0';
118 while (buffer->GetLength() >= 3)
119 WriteNextTriplet(context, buffer);
120 if (context->hasMoreCharacters()) {
121 context->writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
122 }
123 } else if (available == 1 && rest == 1) {
124 while (buffer->GetLength() >= 3)
125 WriteNextTriplet(context, buffer);
126 if (context->hasMoreCharacters()) {
127 context->writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
128 }
129 context->m_pos--;
130 } else if (rest == 0) {
131 while (buffer->GetLength() >= 3)
132 WriteNextTriplet(context, buffer);
133 if (available > 0 || context->hasMoreCharacters()) {
134 context->writeCodeword(CBC_HighLevelEncoder::C40_UNLATCH);
135 }
136 } else {
137 return false;
138 }
139 context->SignalEncoderChange(CBC_HighLevelEncoder::Encoding::ASCII);
140 return true;
141 }
142
EncodeChar(wchar_t c,WideString * sb)143 int32_t CBC_C40Encoder::EncodeChar(wchar_t c, WideString* sb) {
144 if (c == ' ') {
145 *sb += (wchar_t)'\3';
146 return 1;
147 }
148 if (FXSYS_IsDecimalDigit(c)) {
149 *sb += (wchar_t)(c - 48 + 4);
150 return 1;
151 }
152 if ((c >= 'A') && (c <= 'Z')) {
153 *sb += (wchar_t)(c - 65 + 14);
154 return 1;
155 }
156 if (c <= 0x1f) {
157 *sb += (wchar_t)'\0';
158 *sb += c;
159 return 2;
160 }
161 if ((c >= '!') && (c <= '/')) {
162 *sb += (wchar_t)'\1';
163 *sb += (wchar_t)(c - 33);
164 return 2;
165 }
166 if ((c >= ':') && (c <= '@')) {
167 *sb += (wchar_t)'\1';
168 *sb += (wchar_t)(c - 58 + 15);
169 return 2;
170 }
171 if ((c >= '[') && (c <= '_')) {
172 *sb += (wchar_t)'\1';
173 *sb += (wchar_t)(c - 91 + 22);
174 return 2;
175 }
176 if ((c >= 60) && (c <= 0x7f)) {
177 *sb += (wchar_t)'\2';
178 *sb += (wchar_t)(c - 96);
179 return 2;
180 }
181 if (c >= 80) {
182 *sb += (wchar_t)'\1';
183 *sb += (wchar_t)0x001e;
184 int32_t encode_result = EncodeChar(c - 128, sb);
185 return encode_result > 0 ? encode_result + 2 : 0;
186 }
187 return 0;
188 }
189
BacktrackOneCharacter(CBC_EncoderContext * context,WideString * buffer,int32_t lastCharSize)190 int32_t CBC_C40Encoder::BacktrackOneCharacter(CBC_EncoderContext* context,
191 WideString* buffer,
192 int32_t lastCharSize) {
193 ASSERT(lastCharSize >= 0);
194
195 if (context->m_pos < 1)
196 return -1;
197
198 size_t count = buffer->GetLength();
199 if (count < static_cast<size_t>(lastCharSize))
200 return -1;
201
202 buffer->Delete(count - lastCharSize, lastCharSize);
203 context->m_pos--;
204 wchar_t c = context->getCurrentChar();
205 WideString removed;
206 int32_t len = EncodeChar(c, &removed);
207 if (len <= 0)
208 return -1;
209
210 context->resetSymbolInfo();
211 return len;
212 }
213