1 // Copyright 2014 The PDFium Authors
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 Jeremias Maerki in part, and ZXing Authors in part
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/pdf417/BC_PDF417HighLevelEncoder.h"
24
25 #include "core/fxcrt/fx_extension.h"
26 #include "core/fxcrt/fx_string.h"
27 #include "third_party/bigint/BigIntegerLibrary.hh"
28
29 namespace {
30
31 constexpr int16_t kLatchToText = 900;
32 constexpr int16_t kLatchToBytePadded = 901;
33 constexpr int16_t kLatchToNumeric = 902;
34 constexpr int16_t kShiftToByte = 913;
35 constexpr int16_t kLatchToByte = 924;
36
37 constexpr int8_t kMixed[128] = {
38 -1, -1, -1, -1, -1, -1, -1, -1, -1, 12, -1, -1, -1, 11, -1, -1, -1, -1, -1,
39 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, -1, -1, 15, 18, 21,
40 10, -1, -1, -1, 22, 20, 13, 16, 17, 19, 0, 1, 2, 3, 4, 5, 6, 7, 8,
41 9, 14, -1, -1, 23, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
42 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 24,
43 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
44 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1};
45
46 constexpr int8_t kPunctuation[128] = {
47 -1, -1, -1, -1, -1, -1, -1, -1, -1, 12, 15, -1, -1, 11, -1, -1, -1, -1, -1,
48 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 10, 20, -1, 18, -1,
49 -1, 28, 23, 24, 22, -1, 13, 16, 17, 19, -1, -1, -1, -1, -1, -1, -1, -1, -1,
50 -1, 14, 0, 1, -1, 2, 25, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
51 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 4, 5, 6, -1,
52 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,
53 -1, -1, -1, -1, -1, -1, -1, -1, -1, 26, 21, 27, 9, -1};
54
IsAlphaUpperOrSpace(wchar_t ch)55 bool IsAlphaUpperOrSpace(wchar_t ch) {
56 return ch == ' ' || FXSYS_IsUpperASCII(ch);
57 }
58
IsAlphaLowerOrSpace(wchar_t ch)59 bool IsAlphaLowerOrSpace(wchar_t ch) {
60 return ch == ' ' || FXSYS_IsLowerASCII(ch);
61 }
62
IsMixed(wchar_t ch)63 bool IsMixed(wchar_t ch) {
64 // Bounds check avoiding sign mismatch error given questionable signedness.
65 return !((ch & ~0x7F) || kMixed[ch] == -1);
66 }
67
IsPunctuation(wchar_t ch)68 bool IsPunctuation(wchar_t ch) {
69 // Bounds check avoiding sign mismatch error given questionable signedness.
70 return !((ch & ~0x7F) || kPunctuation[ch] == -1);
71 }
72
IsText(wchar_t ch)73 bool IsText(wchar_t ch) {
74 return (ch >= 32 && ch <= 126) || ch == '\t' || ch == '\n' || ch == '\r';
75 }
76
77 } // namespace
78
79 // static
EncodeHighLevel(WideStringView msg)80 absl::optional<WideString> CBC_PDF417HighLevelEncoder::EncodeHighLevel(
81 WideStringView msg) {
82 const ByteString bytes = FX_UTF8Encode(msg);
83 size_t len = bytes.GetLength();
84 WideString result;
85 result.Reserve(len);
86 for (size_t i = 0; i < len; i++) {
87 wchar_t ch = bytes[i] & 0xff;
88 if (ch == '?' && bytes[i] != '?')
89 return absl::nullopt;
90
91 result += ch;
92 }
93 len = result.GetLength();
94 WideString sb;
95 sb.Reserve(len);
96 size_t p = 0;
97 SubMode textSubMode = SubMode::kAlpha;
98 EncodingMode encodingMode = EncodingMode::kUnknown;
99 while (p < len) {
100 size_t n = DetermineConsecutiveDigitCount(result, p);
101 if (n >= 13) {
102 sb += kLatchToNumeric;
103 encodingMode = EncodingMode::kNumeric;
104 textSubMode = SubMode::kAlpha;
105 EncodeNumeric(result, p, n, &sb);
106 p += n;
107 } else {
108 size_t t = DetermineConsecutiveTextCount(result, p);
109 if (t >= 5 || n == len) {
110 if (encodingMode != EncodingMode::kText) {
111 sb += kLatchToText;
112 encodingMode = EncodingMode::kText;
113 textSubMode = SubMode::kAlpha;
114 }
115 textSubMode = EncodeText(result, p, t, textSubMode, &sb);
116 p += t;
117 } else {
118 absl::optional<size_t> b =
119 DetermineConsecutiveBinaryCount(result, bytes.raw_span(), p);
120 if (!b.has_value())
121 return absl::nullopt;
122
123 size_t b_value = b.value();
124 if (b_value == 0)
125 b_value = 1;
126 if (b_value == 1 && encodingMode == EncodingMode::kText) {
127 EncodeBinary(bytes.raw_span(), p, 1, EncodingMode::kText, &sb);
128 } else {
129 EncodeBinary(bytes.raw_span(), p, b_value, encodingMode, &sb);
130 encodingMode = EncodingMode::kByte;
131 textSubMode = SubMode::kAlpha;
132 }
133 p += b_value;
134 }
135 }
136 }
137 return sb;
138 }
139
EncodeText(const WideString & msg,size_t startpos,size_t count,SubMode initialSubmode,WideString * sb)140 CBC_PDF417HighLevelEncoder::SubMode CBC_PDF417HighLevelEncoder::EncodeText(
141 const WideString& msg,
142 size_t startpos,
143 size_t count,
144 SubMode initialSubmode,
145 WideString* sb) {
146 WideString tmp;
147 tmp.Reserve(count);
148 SubMode submode = initialSubmode;
149 size_t idx = 0;
150 while (idx < count) {
151 wchar_t ch = msg[startpos + idx];
152 switch (submode) {
153 case SubMode::kAlpha:
154 if (IsAlphaUpperOrSpace(ch)) {
155 if (ch == ' ')
156 tmp += 26;
157 else
158 tmp += ch - 65;
159 break;
160 }
161 if (IsAlphaLowerOrSpace(ch)) {
162 submode = SubMode::kLower;
163 tmp += 27;
164 continue;
165 }
166 if (IsMixed(ch)) {
167 submode = SubMode::kMixed;
168 tmp += 28;
169 continue;
170 }
171 if (IsPunctuation(ch)) {
172 tmp += 29;
173 tmp += kPunctuation[ch];
174 }
175 break;
176 case SubMode::kLower:
177 if (IsAlphaLowerOrSpace(ch)) {
178 if (ch == ' ')
179 tmp += 26;
180 else
181 tmp += ch - 97;
182 break;
183 }
184 if (IsAlphaUpperOrSpace(ch)) {
185 tmp += 27;
186 tmp += ch - 65;
187 break;
188 }
189 if (IsMixed(ch)) {
190 submode = SubMode::kMixed;
191 tmp += 28;
192 continue;
193 }
194 if (IsPunctuation(ch)) {
195 tmp += 29;
196 tmp += kPunctuation[ch];
197 }
198 break;
199 case SubMode::kMixed:
200 if (IsMixed(ch)) {
201 tmp += kMixed[ch];
202 break;
203 }
204 if (IsAlphaUpperOrSpace(ch)) {
205 submode = SubMode::kAlpha;
206 tmp += 28;
207 continue;
208 }
209 if (IsAlphaLowerOrSpace(ch)) {
210 submode = SubMode::kLower;
211 tmp += 27;
212 continue;
213 }
214 if (startpos + idx + 1 < count) {
215 wchar_t next = msg[startpos + idx + 1];
216 if (IsPunctuation(next)) {
217 submode = SubMode::kPunctuation;
218 tmp += 25;
219 continue;
220 }
221 }
222 if (IsPunctuation(ch)) {
223 tmp += 29;
224 tmp += kPunctuation[ch];
225 }
226 break;
227 default:
228 if (IsPunctuation(ch)) {
229 tmp += kPunctuation[ch];
230 break;
231 }
232 submode = SubMode::kAlpha;
233 tmp += 29;
234 continue;
235 }
236 ++idx;
237 }
238 wchar_t h = 0;
239 size_t len = tmp.GetLength();
240 for (size_t i = 0; i < len; i++) {
241 bool odd = (i % 2) != 0;
242 if (odd) {
243 h = (h * 30) + tmp[i];
244 *sb += h;
245 } else {
246 h = tmp[i];
247 }
248 }
249 if ((len % 2) != 0)
250 *sb += (h * 30) + 29;
251 return submode;
252 }
253
EncodeBinary(pdfium::span<const uint8_t> bytes,size_t startpos,size_t count,EncodingMode startmode,WideString * sb)254 void CBC_PDF417HighLevelEncoder::EncodeBinary(pdfium::span<const uint8_t> bytes,
255 size_t startpos,
256 size_t count,
257 EncodingMode startmode,
258 WideString* sb) {
259 if (count == 1 && startmode == EncodingMode::kText)
260 *sb += kShiftToByte;
261
262 size_t idx = startpos;
263 if (count >= 6) {
264 *sb += kLatchToByte;
265 wchar_t chars[5];
266 while ((startpos + count - idx) >= 6) {
267 int64_t t = 0;
268 for (size_t i = 0; i < 6; i++) {
269 t <<= 8;
270 t += bytes[idx + i] & 0xff;
271 }
272 for (size_t i = 0; i < 5; i++) {
273 chars[i] = (t % 900);
274 t /= 900;
275 }
276 for (size_t i = 5; i >= 1; i--)
277 *sb += (chars[i - 1]);
278 idx += 6;
279 }
280 }
281 if (idx < startpos + count)
282 *sb += kLatchToBytePadded;
283 for (size_t i = idx; i < startpos + count; i++) {
284 int32_t ch = bytes[i] & 0xff;
285 *sb += ch;
286 }
287 }
288
EncodeNumeric(const WideString & msg,size_t startpos,size_t count,WideString * sb)289 void CBC_PDF417HighLevelEncoder::EncodeNumeric(const WideString& msg,
290 size_t startpos,
291 size_t count,
292 WideString* sb) {
293 size_t idx = 0;
294 BigInteger num900 = 900;
295 while (idx < count) {
296 WideString tmp;
297 size_t len = 44 < count - idx ? 44 : count - idx;
298 ByteString part = (L'1' + msg.Substr(startpos + idx, len)).ToUTF8();
299 BigInteger bigint = stringToBigInteger(part.c_str());
300 do {
301 int32_t c = (bigint % num900).toInt();
302 tmp += c;
303 bigint = bigint / num900;
304 } while (!bigint.isZero());
305 for (size_t i = tmp.GetLength(); i >= 1; i--)
306 *sb += tmp[i - 1];
307 idx += len;
308 }
309 }
310
DetermineConsecutiveDigitCount(WideString msg,size_t startpos)311 size_t CBC_PDF417HighLevelEncoder::DetermineConsecutiveDigitCount(
312 WideString msg,
313 size_t startpos) {
314 size_t count = 0;
315 size_t len = msg.GetLength();
316 size_t idx = startpos;
317 if (idx < len) {
318 wchar_t ch = msg[idx];
319 while (FXSYS_IsDecimalDigit(ch) && idx < len) {
320 count++;
321 idx++;
322 if (idx < len)
323 ch = msg[idx];
324 }
325 }
326 return count;
327 }
328
DetermineConsecutiveTextCount(WideString msg,size_t startpos)329 size_t CBC_PDF417HighLevelEncoder::DetermineConsecutiveTextCount(
330 WideString msg,
331 size_t startpos) {
332 size_t len = msg.GetLength();
333 size_t idx = startpos;
334 while (idx < len) {
335 wchar_t ch = msg[idx];
336 size_t numericCount = 0;
337 while (numericCount < 13 && FXSYS_IsDecimalDigit(ch) && idx < len) {
338 numericCount++;
339 idx++;
340 if (idx < len)
341 ch = msg[idx];
342 }
343 if (numericCount >= 13)
344 return idx - startpos - numericCount;
345 if (numericCount > 0)
346 continue;
347 ch = msg[idx];
348 if (!IsText(ch))
349 break;
350 idx++;
351 }
352 return idx - startpos;
353 }
354
355 absl::optional<size_t>
DetermineConsecutiveBinaryCount(WideString msg,pdfium::span<const uint8_t> bytes,size_t startpos)356 CBC_PDF417HighLevelEncoder::DetermineConsecutiveBinaryCount(
357 WideString msg,
358 pdfium::span<const uint8_t> bytes,
359 size_t startpos) {
360 size_t len = msg.GetLength();
361 size_t idx = startpos;
362 while (idx < len) {
363 wchar_t ch = msg[idx];
364 size_t numericCount = 0;
365 while (numericCount < 13 && FXSYS_IsDecimalDigit(ch)) {
366 numericCount++;
367 size_t i = idx + numericCount;
368 if (i >= len)
369 break;
370 ch = msg[i];
371 }
372 if (numericCount >= 13)
373 return idx - startpos;
374
375 size_t textCount = 0;
376 while (textCount < 5 && IsText(ch)) {
377 textCount++;
378 size_t i = idx + textCount;
379 if (i >= len)
380 break;
381 ch = msg[i];
382 }
383 if (textCount >= 5)
384 return idx - startpos;
385 ch = msg[idx];
386 if (bytes[idx] == 63 && ch != '?')
387 return absl::nullopt;
388 idx++;
389 }
390 return idx - startpos;
391 }
392