// Copyright 2014 The PDFium Authors // 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 #include #include #include "core/fxcrt/fixed_zeroed_data_vector.h" #include "fxbarcode/datamatrix/BC_Encoder.h" #include "fxbarcode/datamatrix/BC_SymbolInfo.h" #include "third_party/base/check.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}; constexpr uint8_t LOG[256] = { 0, 0, 1, 240, 2, 225, 241, 53, 3, 38, 226, 133, 242, 43, 54, 210, 4, 195, 39, 114, 227, 106, 134, 28, 243, 140, 44, 23, 55, 118, 211, 234, 5, 219, 196, 96, 40, 222, 115, 103, 228, 78, 107, 125, 135, 8, 29, 162, 244, 186, 141, 180, 45, 99, 24, 49, 56, 13, 119, 153, 212, 199, 235, 91, 6, 76, 220, 217, 197, 11, 97, 184, 41, 36, 223, 253, 116, 138, 104, 193, 229, 86, 79, 171, 108, 165, 126, 145, 136, 34, 9, 74, 30, 32, 163, 84, 245, 173, 187, 204, 142, 81, 181, 190, 46, 88, 100, 159, 25, 231, 50, 207, 57, 147, 14, 67, 120, 128, 154, 248, 213, 167, 200, 63, 236, 110, 92, 176, 7, 161, 77, 124, 221, 102, 218, 95, 198, 90, 12, 152, 98, 48, 185, 179, 42, 209, 37, 132, 224, 52, 254, 239, 117, 233, 139, 22, 105, 27, 194, 113, 230, 206, 87, 158, 80, 189, 172, 203, 109, 175, 166, 62, 127, 247, 146, 66, 137, 192, 35, 252, 10, 183, 75, 216, 31, 83, 33, 73, 164, 144, 85, 170, 246, 65, 174, 61, 188, 202, 205, 157, 143, 169, 82, 72, 182, 215, 191, 251, 47, 178, 89, 151, 101, 94, 160, 123, 26, 112, 232, 21, 51, 238, 208, 131, 58, 69, 148, 18, 15, 16, 68, 17, 121, 149, 129, 19, 155, 59, 249, 70, 214, 250, 168, 71, 201, 156, 64, 60, 237, 130, 111, 20, 93, 122, 177, 150}; constexpr uint8_t ALOG[256] = { 1, 2, 4, 8, 16, 32, 64, 128, 45, 90, 180, 69, 138, 57, 114, 228, 229, 231, 227, 235, 251, 219, 155, 27, 54, 108, 216, 157, 23, 46, 92, 184, 93, 186, 89, 178, 73, 146, 9, 18, 36, 72, 144, 13, 26, 52, 104, 208, 141, 55, 110, 220, 149, 7, 14, 28, 56, 112, 224, 237, 247, 195, 171, 123, 246, 193, 175, 115, 230, 225, 239, 243, 203, 187, 91, 182, 65, 130, 41, 82, 164, 101, 202, 185, 95, 190, 81, 162, 105, 210, 137, 63, 126, 252, 213, 135, 35, 70, 140, 53, 106, 212, 133, 39, 78, 156, 21, 42, 84, 168, 125, 250, 217, 159, 19, 38, 76, 152, 29, 58, 116, 232, 253, 215, 131, 43, 86, 172, 117, 234, 249, 223, 147, 11, 22, 44, 88, 176, 77, 154, 25, 50, 100, 200, 189, 87, 174, 113, 226, 233, 255, 211, 139, 59, 118, 236, 245, 199, 163, 107, 214, 129, 47, 94, 188, 85, 170, 121, 242, 201, 191, 83, 166, 97, 194, 169, 127, 254, 209, 143, 51, 102, 204, 181, 71, 142, 49, 98, 196, 165, 103, 206, 177, 79, 158, 17, 34, 68, 136, 61, 122, 244, 197, 167, 99, 198, 161, 111, 222, 145, 15, 30, 60, 120, 240, 205, 183, 67, 134, 33, 66, 132, 37, 74, 148, 5, 10, 20, 40, 80, 160, 109, 218, 153, 31, 62, 124, 248, 221, 151, 3, 6, 12, 24, 48, 96, 192, 173, 119, 238, 241, 207, 179, 75, 150, 0}; WideString CreateECCBlock(const WideString& codewords, size_t numECWords) { DCHECK(numECWords > 0); const size_t len = codewords.GetLength(); static constexpr size_t kFactorTableNum = std::size(FACTOR_SETS); size_t table = 0; while (table < kFactorTableNum && FACTOR_SETS[table] != numECWords) ++table; if (table >= kFactorTableNum) return WideString(); FixedZeroedDataVector ecc(numECWords); pdfium::span ecc_span = ecc.writable_span(); for (size_t i = 0; i < len; ++i) { uint16_t m = ecc_span[numECWords - 1] ^ codewords[i]; for (int32_t j = numECWords - 1; j > 0; --j) { if (m != 0 && FACTORS[table][j] != 0) { ecc_span[j] = static_cast( ecc_span[j - 1] ^ ALOG[(LOG[m] + LOG[FACTORS[table][j]]) % 255]); } else { ecc_span[j] = ecc_span[j - 1]; } } if (m != 0 && FACTORS[table][0] != 0) { ecc_span[0] = static_cast(ALOG[(LOG[m] + LOG[FACTORS[table][0]]) % 255]); } else { ecc_span[0] = 0; } } WideString strecc; strecc.Reserve(numECWords); for (size_t i = 0; i < numECWords; ++i) strecc.InsertAtBack(static_cast(ecc_span[numECWords - i - 1])); DCHECK(!strecc.IsEmpty()); return strecc; } } // namespace WideString CBC_ErrorCorrection::EncodeECC200(const WideString& codewords, const CBC_SymbolInfo* symbolInfo) { if (codewords.GetLength() != symbolInfo->data_capacity()) return WideString(); WideString sb = codewords; size_t blockCount = symbolInfo->GetInterleavedBlockCount(); if (blockCount == 1) { WideString ecc = CreateECCBlock(codewords, symbolInfo->error_codewords()); if (ecc.IsEmpty()) return WideString(); sb += ecc; } else { std::vector dataSizes(blockCount); std::vector errorSizes(blockCount); std::vector startPos(blockCount); for (size_t i = 0; i < blockCount; ++i) { dataSizes[i] = symbolInfo->GetDataLengthForInterleavedBlock(); errorSizes[i] = symbolInfo->GetErrorLengthForInterleavedBlock(); startPos[i] = i > 0 ? startPos[i - 1] + dataSizes[i] : 0; } size_t max_error_sizes = *std::max_element(errorSizes.begin(), errorSizes.end()) * blockCount; sb.Reserve(sb.GetLength() + max_error_sizes); for (size_t i = 0; i < max_error_sizes; ++i) sb.InsertAtBack(0); for (size_t block = 0; block < blockCount; ++block) { WideString temp; if (symbolInfo->data_capacity() > block) temp.Reserve((symbolInfo->data_capacity() - block / blockCount) + 1); for (size_t d = block; d < symbolInfo->data_capacity(); d += blockCount) temp.InsertAtBack(static_cast(codewords[d])); WideString ecc = CreateECCBlock(temp, errorSizes[block]); if (ecc.IsEmpty()) return WideString(); for (size_t pos = 0, i = block; i < errorSizes[block] * blockCount; ++pos, i += blockCount) { sb.SetAt(symbolInfo->data_capacity() + i, ecc[pos]); } } } DCHECK(!sb.IsEmpty()); return sb; }