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 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/src/fxbarcode/barcode.h"
24 #include "BC_Encoder.h"
25 #include "BC_SymbolShapeHint.h"
26 #include "BC_SymbolInfo.h"
27 #include "BC_ErrorCorrection.h"
28 int32_t CBC_ErrorCorrection::FACTOR_SETS[] = {5,  7,  10, 11, 12, 14, 18, 20,
29                                               24, 28, 36, 42, 48, 56, 62, 68};
30 int32_t CBC_ErrorCorrection::FACTORS[][100] = {
31     {228, 48, 15, 111, 62},
32     {23, 68, 144, 134, 240, 92, 254},
33     {28, 24, 185, 166, 223, 248, 116, 255, 110, 61},
34     {175, 138, 205, 12, 194, 168, 39, 245, 60, 97, 120},
35     {41, 153, 158, 91, 61, 42, 142, 213, 97, 178, 100, 242},
36     {156, 97, 192, 252, 95, 9, 157, 119, 138, 45, 18, 186, 83, 185},
37     {83, 195, 100, 39, 188, 75, 66, 61, 241, 213, 109, 129, 94, 254, 225, 48,
38      90, 188},
39     {15, 195, 244, 9, 233, 71, 168, 2, 188, 160, 153, 145, 253, 79, 108, 82, 27,
40      174, 186, 172},
41     {52, 190, 88, 205, 109, 39, 176, 21, 155, 197, 251, 223, 155, 21, 5, 172,
42      254, 124, 12, 181, 184, 96, 50, 193},
43     {211, 231, 43, 97, 71, 96, 103, 174, 37, 151, 170, 53, 75, 34, 249, 121, 17,
44      138, 110, 213, 141, 136, 120, 151, 233, 168, 93, 255},
45     {245, 127, 242, 218, 130, 250, 162, 181, 102, 120, 84, 179, 220, 251, 80,
46      182, 229, 18, 2, 4, 68, 33, 101, 137, 95, 119, 115, 44, 175, 184, 59, 25,
47      225, 98, 81, 112},
48     {77, 193, 137, 31, 19, 38, 22, 153, 247, 105, 122, 2, 245, 133, 242, 8, 175,
49      95, 100, 9, 167, 105, 214, 111, 57, 121, 21, 1, 253, 57, 54, 101, 248, 202,
50      69, 50, 150, 177, 226, 5, 9, 5},
51     {245, 132, 172, 223, 96, 32, 117, 22, 238, 133, 238, 231, 205, 188, 237, 87,
52      191, 106, 16, 147, 118, 23, 37, 90, 170, 205, 131, 88, 120, 100, 66, 138,
53      186, 240, 82, 44, 176, 87, 187, 147, 160, 175, 69, 213, 92, 253, 225, 19},
54     {175, 9, 223, 238, 12, 17, 220, 208, 100, 29, 175, 170, 230, 192, 215, 235,
55      150, 159, 36, 223, 38, 200, 132, 54, 228, 146, 218, 234, 117, 203, 29, 232,
56      144, 238, 22, 150, 201, 117, 62, 207, 164, 13, 137, 245, 127, 67, 247, 28,
57      155, 43, 203, 107, 233, 53, 143, 46},
58     {242, 93, 169, 50, 144, 210, 39, 118, 202, 188, 201, 189, 143, 108, 196, 37,
59      185, 112, 134, 230, 245, 63, 197, 190, 250, 106, 185, 221, 175, 64, 114,
60      71, 161, 44, 147, 6, 27, 218, 51, 63, 87, 10, 40, 130, 188, 17, 163, 31,
61      176, 170, 4, 107, 232, 7, 94, 166, 224, 124, 86, 47, 11, 204},
62     {220, 228, 173, 89, 251, 149, 159, 56, 89, 33, 147, 244, 154, 36, 73, 127,
63      213, 136, 248, 180, 234, 197, 158, 177, 68, 122, 93, 213, 15, 160, 227,
64      236, 66, 139, 153, 185, 202, 167, 179, 25, 220, 232, 96, 210, 231, 136,
65      223, 239, 181, 241, 59, 52, 172, 25, 49, 232, 211, 189, 64, 54, 108, 153,
66      132, 63, 96, 103, 82, 186}};
67 int32_t CBC_ErrorCorrection::MODULO_VALUE = 0x12D;
68 int32_t CBC_ErrorCorrection::LOG[256] = {0};
69 int32_t CBC_ErrorCorrection::ALOG[256] = {0};
Initialize()70 void CBC_ErrorCorrection::Initialize() {
71   int32_t p = 1;
72   for (int32_t i = 0; i < 255; i++) {
73     ALOG[i] = p;
74     LOG[p] = i;
75     p <<= 1;
76     if (p >= 256) {
77       p ^= MODULO_VALUE;
78     }
79   }
80 }
Finalize()81 void CBC_ErrorCorrection::Finalize() {}
CBC_ErrorCorrection()82 CBC_ErrorCorrection::CBC_ErrorCorrection() {}
~CBC_ErrorCorrection()83 CBC_ErrorCorrection::~CBC_ErrorCorrection() {}
encodeECC200(CFX_WideString codewords,CBC_SymbolInfo * symbolInfo,int32_t & e)84 CFX_WideString CBC_ErrorCorrection::encodeECC200(CFX_WideString codewords,
85                                                  CBC_SymbolInfo* symbolInfo,
86                                                  int32_t& e) {
87   if (codewords.GetLength() != symbolInfo->m_dataCapacity) {
88     e = BCExceptionIllegalArgument;
89     return (FX_WCHAR*)"";
90   }
91   CFX_WideString sb;
92   sb += codewords;
93   int32_t blockCount = symbolInfo->getInterleavedBlockCount();
94   if (blockCount == 1) {
95     CFX_WideString ecc =
96         createECCBlock(codewords, symbolInfo->m_errorCodewords, e);
97     BC_EXCEPTION_CHECK_ReturnValue(e, (FX_WCHAR*)"");
98     sb += ecc;
99   } else {
100     CFX_Int32Array dataSizes;
101     dataSizes.SetSize(blockCount);
102     CFX_Int32Array errorSizes;
103     errorSizes.SetSize(blockCount);
104     CFX_Int32Array startPos;
105     startPos.SetSize(blockCount);
106     for (int32_t i = 0; i < blockCount; i++) {
107       dataSizes[i] = symbolInfo->getDataLengthForInterleavedBlock(i + 1);
108       errorSizes[i] = symbolInfo->getErrorLengthForInterleavedBlock(i + 1);
109       startPos[i] = 0;
110       if (i > 0) {
111         startPos[i] = startPos[i - 1] + dataSizes[i];
112       }
113     }
114     for (int32_t block = 0; block < blockCount; block++) {
115       CFX_WideString temp;
116       for (int32_t d = block; d < symbolInfo->m_dataCapacity; d += blockCount) {
117         temp += (FX_WCHAR)codewords.GetAt(d);
118       }
119       CFX_WideString ecc = createECCBlock(temp, errorSizes[block], e);
120       BC_EXCEPTION_CHECK_ReturnValue(e, (FX_WCHAR*)"");
121       int32_t pos = 0;
122       for (int32_t l = block; l < errorSizes[block] * blockCount;
123            l += blockCount) {
124         sb.SetAt(symbolInfo->m_dataCapacity + l, ecc.GetAt(pos++));
125       }
126     }
127   }
128   return sb;
129 }
createECCBlock(CFX_WideString codewords,int32_t numECWords,int32_t & e)130 CFX_WideString CBC_ErrorCorrection::createECCBlock(CFX_WideString codewords,
131                                                    int32_t numECWords,
132                                                    int32_t& e) {
133   return createECCBlock(codewords, 0, codewords.GetLength(), numECWords, e);
134 }
createECCBlock(CFX_WideString codewords,int32_t start,int32_t len,int32_t numECWords,int32_t & e)135 CFX_WideString CBC_ErrorCorrection::createECCBlock(CFX_WideString codewords,
136                                                    int32_t start,
137                                                    int32_t len,
138                                                    int32_t numECWords,
139                                                    int32_t& e) {
140   int32_t table = -1;
141   for (int32_t i = 0; i < sizeof(FACTOR_SETS) / sizeof(int32_t); i++) {
142     if (FACTOR_SETS[i] == numECWords) {
143       table = i;
144       break;
145     }
146   }
147   if (table < 0) {
148     e = BCExceptionIllegalArgument;
149     return (FX_WCHAR*)"";
150   }
151   FX_WORD* ecc = FX_Alloc(FX_WORD, numECWords);
152   FXSYS_memset(ecc, 0, numECWords * sizeof(FX_WORD));
153   for (int32_t l = start; l < start + len; l++) {
154     FX_WORD m = ecc[numECWords - 1] ^ codewords.GetAt(l);
155     for (int32_t k = numECWords - 1; k > 0; k--) {
156       if (m != 0 && FACTORS[table][k] != 0) {
157         ecc[k] = (FX_WORD)(ecc[k - 1] ^
158                            ALOG[(LOG[m] + LOG[FACTORS[table][k]]) % 255]);
159       } else {
160         ecc[k] = ecc[k - 1];
161       }
162     }
163     if (m != 0 && FACTORS[table][0] != 0) {
164       ecc[0] = (FX_WORD)ALOG[(LOG[m] + LOG[FACTORS[table][0]]) % 255];
165     } else {
166       ecc[0] = 0;
167     }
168   }
169   CFX_WideString strecc;
170   for (int32_t j = 0; j < numECWords; j++) {
171     strecc += (FX_WCHAR)ecc[numECWords - j - 1];
172   }
173   FX_Free(ecc);
174   return strecc;
175 }
176