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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
// Original code is licensed as follows:
/*
* Copyright 2006 Jeremias Maerki.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "fxbarcode/datamatrix/BC_ErrorCorrection.h"
#include <vector>
#include "fxbarcode/datamatrix/BC_Encoder.h"
#include "fxbarcode/datamatrix/BC_SymbolInfo.h"
#include "fxbarcode/utils.h"
namespace {
const uint8_t FACTOR_SETS[] = {5, 7, 10, 11, 12, 14, 18, 20,
24, 28, 36, 42, 48, 56, 62, 68};
const uint8_t FACTORS_0[5] = {228, 48, 15, 111, 62};
const uint8_t FACTORS_1[7] = {23, 68, 144, 134, 240, 92, 254};
const uint8_t FACTORS_2[10] = {28, 24, 185, 166, 223, 248, 116, 255, 110, 61};
const uint8_t FACTORS_3[11] = {175, 138, 205, 12, 194, 168,
39, 245, 60, 97, 120};
const uint8_t FACTORS_4[12] = {41, 153, 158, 91, 61, 42,
142, 213, 97, 178, 100, 242};
const uint8_t FACTORS_5[14] = {156, 97, 192, 252, 95, 9, 157,
119, 138, 45, 18, 186, 83, 185};
const uint8_t FACTORS_6[18] = {83, 195, 100, 39, 188, 75, 66, 61, 241,
213, 109, 129, 94, 254, 225, 48, 90, 188};
const uint8_t FACTORS_7[20] = {15, 195, 244, 9, 233, 71, 168, 2, 188, 160,
153, 145, 253, 79, 108, 82, 27, 174, 186, 172};
const uint8_t FACTORS_8[24] = {52, 190, 88, 205, 109, 39, 176, 21,
155, 197, 251, 223, 155, 21, 5, 172,
254, 124, 12, 181, 184, 96, 50, 193};
const uint8_t FACTORS_9[28] = {211, 231, 43, 97, 71, 96, 103, 174, 37, 151,
170, 53, 75, 34, 249, 121, 17, 138, 110, 213,
141, 136, 120, 151, 233, 168, 93, 255};
const uint8_t FACTORS_10[36] = {245, 127, 242, 218, 130, 250, 162, 181, 102,
120, 84, 179, 220, 251, 80, 182, 229, 18,
2, 4, 68, 33, 101, 137, 95, 119, 115,
44, 175, 184, 59, 25, 225, 98, 81, 112};
const uint8_t FACTORS_11[42] = {
77, 193, 137, 31, 19, 38, 22, 153, 247, 105, 122, 2, 245, 133,
242, 8, 175, 95, 100, 9, 167, 105, 214, 111, 57, 121, 21, 1,
253, 57, 54, 101, 248, 202, 69, 50, 150, 177, 226, 5, 9, 5};
const uint8_t FACTORS_12[48] = {
245, 132, 172, 223, 96, 32, 117, 22, 238, 133, 238, 231,
205, 188, 237, 87, 191, 106, 16, 147, 118, 23, 37, 90,
170, 205, 131, 88, 120, 100, 66, 138, 186, 240, 82, 44,
176, 87, 187, 147, 160, 175, 69, 213, 92, 253, 225, 19};
const uint8_t FACTORS_13[56] = {
175, 9, 223, 238, 12, 17, 220, 208, 100, 29, 175, 170, 230, 192,
215, 235, 150, 159, 36, 223, 38, 200, 132, 54, 228, 146, 218, 234,
117, 203, 29, 232, 144, 238, 22, 150, 201, 117, 62, 207, 164, 13,
137, 245, 127, 67, 247, 28, 155, 43, 203, 107, 233, 53, 143, 46};
const uint8_t FACTORS_14[62] = {
242, 93, 169, 50, 144, 210, 39, 118, 202, 188, 201, 189, 143,
108, 196, 37, 185, 112, 134, 230, 245, 63, 197, 190, 250, 106,
185, 221, 175, 64, 114, 71, 161, 44, 147, 6, 27, 218, 51,
63, 87, 10, 40, 130, 188, 17, 163, 31, 176, 170, 4, 107,
232, 7, 94, 166, 224, 124, 86, 47, 11, 204};
const uint8_t FACTORS_15[68] = {
220, 228, 173, 89, 251, 149, 159, 56, 89, 33, 147, 244, 154, 36,
73, 127, 213, 136, 248, 180, 234, 197, 158, 177, 68, 122, 93, 213,
15, 160, 227, 236, 66, 139, 153, 185, 202, 167, 179, 25, 220, 232,
96, 210, 231, 136, 223, 239, 181, 241, 59, 52, 172, 25, 49, 232,
211, 189, 64, 54, 108, 153, 132, 63, 96, 103, 82, 186};
const uint8_t* const FACTORS[16] = {
FACTORS_0, FACTORS_1, FACTORS_2, FACTORS_3, FACTORS_4, FACTORS_5,
FACTORS_6, FACTORS_7, FACTORS_8, FACTORS_9, FACTORS_10, FACTORS_11,
FACTORS_12, FACTORS_13, FACTORS_14, FACTORS_15};
} // namespace
int32_t CBC_ErrorCorrection::LOG[256] = {0};
int32_t CBC_ErrorCorrection::ALOG[256] = {0};
void CBC_ErrorCorrection::Initialize() {
int32_t p = 1;
for (int32_t i = 0; i < 255; i++) {
ALOG[i] = p;
LOG[p] = i;
p <<= 1;
if (p >= 256) {
p ^= MODULO_VALUE;
}
}
}
void CBC_ErrorCorrection::Finalize() {}
CBC_ErrorCorrection::CBC_ErrorCorrection() {}
CBC_ErrorCorrection::~CBC_ErrorCorrection() {}
WideString CBC_ErrorCorrection::encodeECC200(WideString codewords,
CBC_SymbolInfo* symbolInfo,
int32_t& e) {
if (pdfium::base::checked_cast<int32_t>(codewords.GetLength()) !=
symbolInfo->dataCapacity()) {
e = BCExceptionIllegalArgument;
return WideString();
}
WideString sb;
sb += codewords;
int32_t blockCount = symbolInfo->getInterleavedBlockCount();
if (blockCount == 1) {
WideString ecc = createECCBlock(codewords, symbolInfo->errorCodewords(), e);
if (e != BCExceptionNO)
return WideString();
sb += ecc;
} else {
std::vector<int32_t> dataSizes(blockCount);
std::vector<int32_t> errorSizes(blockCount);
std::vector<int32_t> startPos(blockCount);
for (int32_t i = 0; i < blockCount; i++) {
dataSizes[i] = symbolInfo->getDataLengthForInterleavedBlock(i + 1);
errorSizes[i] = symbolInfo->getErrorLengthForInterleavedBlock(i + 1);
startPos[i] = 0;
if (i > 0) {
startPos[i] = startPos[i - 1] + dataSizes[i];
}
}
for (int32_t block = 0; block < blockCount; block++) {
WideString temp;
for (int32_t d = block; d < symbolInfo->dataCapacity(); d += blockCount) {
temp += (wchar_t)codewords[d];
}
WideString ecc = createECCBlock(temp, errorSizes[block], e);
if (e != BCExceptionNO)
return WideString();
int32_t pos = 0;
for (int32_t l = block; l < errorSizes[block] * blockCount;
l += blockCount) {
sb.SetAt(symbolInfo->dataCapacity() + l, ecc[pos++]);
}
}
}
return sb;
}
WideString CBC_ErrorCorrection::createECCBlock(WideString codewords,
int32_t numECWords,
int32_t& e) {
return createECCBlock(codewords, 0, codewords.GetLength(), numECWords, e);
}
WideString CBC_ErrorCorrection::createECCBlock(WideString codewords,
int32_t start,
int32_t len,
int32_t numECWords,
int32_t& e) {
static const size_t kFactorTableNum = sizeof(FACTOR_SETS) / sizeof(int32_t);
size_t table = 0;
while (table < kFactorTableNum && FACTOR_SETS[table] != numECWords)
table++;
if (table >= kFactorTableNum) {
e = BCExceptionIllegalArgument;
return WideString();
}
uint16_t* ecc = FX_Alloc(uint16_t, numECWords);
for (int32_t l = start; l < start + len; l++) {
uint16_t m = ecc[numECWords - 1] ^ codewords[l];
for (int32_t k = numECWords - 1; k > 0; k--) {
if (m != 0 && FACTORS[table][k] != 0) {
ecc[k] = (uint16_t)(ecc[k - 1] ^
ALOG[(LOG[m] + LOG[FACTORS[table][k]]) % 255]);
} else {
ecc[k] = ecc[k - 1];
}
}
if (m != 0 && FACTORS[table][0] != 0) {
ecc[0] = (uint16_t)ALOG[(LOG[m] + LOG[FACTORS[table][0]]) % 255];
} else {
ecc[0] = 0;
}
}
WideString strecc;
for (int32_t j = 0; j < numECWords; j++) {
strecc += (wchar_t)ecc[numECWords - j - 1];
}
FX_Free(ecc);
return strecc;
}
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