| // 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 2008 ZXing authors |
| * |
| * 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/qrcode/BC_QRCoderMatrixUtil.h" |
| |
| #include "fxbarcode/common/BC_CommonByteMatrix.h" |
| #include "fxbarcode/qrcode/BC_QRCoder.h" |
| #include "fxbarcode/qrcode/BC_QRCoderBitVector.h" |
| #include "fxbarcode/qrcode/BC_QRCoderErrorCorrectionLevel.h" |
| #include "fxbarcode/qrcode/BC_QRCoderMaskUtil.h" |
| #include "third_party/base/check.h" |
| #include "third_party/base/stl_util.h" |
| |
| namespace { |
| |
| constexpr uint8_t POSITION_DETECTION_PATTERN[7][7] = { |
| {1, 1, 1, 1, 1, 1, 1}, {1, 0, 0, 0, 0, 0, 1}, {1, 0, 1, 1, 1, 0, 1}, |
| {1, 0, 1, 1, 1, 0, 1}, {1, 0, 1, 1, 1, 0, 1}, {1, 0, 0, 0, 0, 0, 1}, |
| {1, 1, 1, 1, 1, 1, 1}}; |
| |
| constexpr uint8_t POSITION_ADJUSTMENT_PATTERN[5][5] = {{1, 1, 1, 1, 1}, |
| {1, 0, 0, 0, 1}, |
| {1, 0, 1, 0, 1}, |
| {1, 0, 0, 0, 1}, |
| {1, 1, 1, 1, 1}}; |
| |
| constexpr size_t kNumCoordinate = 7; |
| constexpr uint8_t kPositionAdjustmentPatternCoordinates[39][kNumCoordinate] = { |
| {6, 18, 0, 0, 0, 0, 0}, {6, 22, 0, 0, 0, 0, 0}, |
| {6, 26, 0, 0, 0, 0, 0}, {6, 30, 0, 0, 0, 0, 0}, |
| {6, 34, 0, 0, 0, 0, 0}, {6, 22, 38, 0, 0, 0, 0}, |
| {6, 24, 42, 0, 0, 0, 0}, {6, 26, 46, 0, 0, 0, 0}, |
| {6, 28, 50, 0, 0, 0, 0}, {6, 30, 54, 0, 0, 0, 0}, |
| {6, 32, 58, 0, 0, 0, 0}, {6, 34, 62, 0, 0, 0, 0}, |
| {6, 26, 46, 66, 0, 0, 0}, {6, 26, 48, 70, 0, 0, 0}, |
| {6, 26, 50, 74, 0, 0, 0}, {6, 30, 54, 78, 0, 0, 0}, |
| {6, 30, 56, 82, 0, 0, 0}, {6, 30, 58, 86, 0, 0, 0}, |
| {6, 34, 62, 90, 0, 0, 0}, {6, 28, 50, 72, 94, 0, 0}, |
| {6, 26, 50, 74, 98, 0, 0}, {6, 30, 54, 78, 102, 0, 0}, |
| {6, 28, 54, 80, 106, 0, 0}, {6, 32, 58, 84, 110, 0, 0}, |
| {6, 30, 58, 86, 114, 0, 0}, {6, 34, 62, 90, 118, 0, 0}, |
| {6, 26, 50, 74, 98, 122, 0}, {6, 30, 54, 78, 102, 126, 0}, |
| {6, 26, 52, 78, 104, 130, 0}, {6, 30, 56, 82, 108, 134, 0}, |
| {6, 34, 60, 86, 112, 138, 0}, {6, 30, 58, 86, 114, 142, 0}, |
| {6, 34, 62, 90, 118, 146, 0}, {6, 30, 54, 78, 102, 126, 150}, |
| {6, 24, 50, 76, 102, 128, 154}, {6, 28, 54, 80, 106, 132, 158}, |
| {6, 32, 58, 84, 110, 136, 162}, {6, 26, 54, 82, 110, 138, 166}, |
| {6, 30, 58, 86, 114, 142, 170}, |
| }; |
| |
| const uint8_t TYPE_INFO_COORDINATES[15][2] = { |
| {8, 0}, {8, 1}, {8, 2}, {8, 3}, {8, 4}, {8, 5}, {8, 7}, {8, 8}, |
| {7, 8}, {5, 8}, {4, 8}, {3, 8}, {2, 8}, {1, 8}, {0, 8}, |
| }; |
| |
| const int32_t VERSION_INFO_POLY = 0x1f25; |
| const int32_t TYPE_INFO_POLY = 0x0537; |
| const int32_t TYPE_INFO_MASK_PATTERN = 0x5412; |
| |
| bool IsEmpty(int32_t value) { |
| return (uint8_t)value == 0xff; |
| } |
| |
| bool IsValidValue(int32_t value) { |
| return ((uint8_t)value == 0xff || (uint8_t)value == 0x00 || |
| (uint8_t)value == 0x01); |
| } |
| |
| int32_t FindMSBSet(int32_t value) { |
| int32_t numDigits = 0; |
| while (value != 0) { |
| value >>= 1; |
| ++numDigits; |
| } |
| return numDigits; |
| } |
| |
| bool EmbedDataBits(CBC_QRCoderBitVector* dataBits, |
| int32_t maskPattern, |
| CBC_CommonByteMatrix* matrix) { |
| size_t szBitIndex = 0; |
| int32_t direction = -1; |
| int32_t x = matrix->GetWidth() - 1; |
| int32_t y = matrix->GetHeight() - 1; |
| while (x > 0) { |
| if (x == 6) |
| x -= 1; |
| |
| while (y >= 0 && y < matrix->GetHeight()) { |
| if (y == 6) { |
| y += direction; |
| continue; |
| } |
| for (int32_t i = 0; i < 2; i++) { |
| int32_t xx = x - i; |
| if (!IsEmpty(matrix->Get(xx, y))) { |
| continue; |
| } |
| int32_t bit; |
| if (szBitIndex < dataBits->Size()) { |
| bit = dataBits->At(szBitIndex); |
| szBitIndex++; |
| } else { |
| bit = 0; |
| } |
| DCHECK(CBC_QRCoder::IsValidMaskPattern(maskPattern)); |
| if (CBC_QRCoderMaskUtil::GetDataMaskBit(maskPattern, xx, y)) |
| bit ^= 0x01; |
| matrix->Set(xx, y, bit); |
| } |
| y += direction; |
| } |
| direction = -direction; |
| y += direction; |
| x -= 2; |
| } |
| return szBitIndex == dataBits->Size(); |
| } |
| |
| int32_t CalculateBCHCode(int32_t value, int32_t poly) { |
| int32_t msbSetInPoly = FindMSBSet(poly); |
| value <<= msbSetInPoly - 1; |
| while (FindMSBSet(value) >= msbSetInPoly) { |
| value ^= poly << (FindMSBSet(value) - msbSetInPoly); |
| } |
| return value; |
| } |
| |
| bool MakeTypeInfoBits(const CBC_QRCoderErrorCorrectionLevel* ecLevel, |
| int32_t maskPattern, |
| CBC_QRCoderBitVector* bits) { |
| if (!CBC_QRCoder::IsValidMaskPattern(maskPattern)) |
| return false; |
| |
| int32_t typeInfo = (ecLevel->GetBits() << 3) | maskPattern; |
| bits->AppendBits(typeInfo, 5); |
| int32_t bchCode = CalculateBCHCode(typeInfo, TYPE_INFO_POLY); |
| bits->AppendBits(bchCode, 10); |
| CBC_QRCoderBitVector maskBits; |
| maskBits.AppendBits(TYPE_INFO_MASK_PATTERN, 15); |
| if (!bits->XOR(&maskBits)) |
| return false; |
| |
| DCHECK(bits->Size() == 15); |
| return true; |
| } |
| |
| void MakeVersionInfoBits(int32_t version, CBC_QRCoderBitVector* bits) { |
| bits->AppendBits(version, 6); |
| int32_t bchCode = CalculateBCHCode(version, VERSION_INFO_POLY); |
| bits->AppendBits(bchCode, 12); |
| DCHECK(bits->Size() == 18); |
| } |
| |
| bool EmbedTypeInfo(const CBC_QRCoderErrorCorrectionLevel* ecLevel, |
| int32_t maskPattern, |
| CBC_CommonByteMatrix* matrix) { |
| CBC_QRCoderBitVector typeInfoBits; |
| if (!MakeTypeInfoBits(ecLevel, maskPattern, &typeInfoBits)) |
| return false; |
| |
| for (size_t i = 0; i < typeInfoBits.Size(); i++) { |
| int32_t bit = typeInfoBits.At(typeInfoBits.Size() - 1 - i); |
| int32_t x1 = TYPE_INFO_COORDINATES[i][0]; |
| int32_t y1 = TYPE_INFO_COORDINATES[i][1]; |
| matrix->Set(x1, y1, bit); |
| if (i < 8) { |
| int32_t x2 = matrix->GetWidth() - i - 1; |
| int32_t y2 = 8; |
| matrix->Set(x2, y2, bit); |
| } else { |
| int32_t x2 = 8; |
| int32_t y2 = matrix->GetHeight() - 7 + (i - 8); |
| matrix->Set(x2, y2, bit); |
| } |
| } |
| return true; |
| } |
| |
| void MaybeEmbedVersionInfo(int32_t version, CBC_CommonByteMatrix* matrix) { |
| if (version < 7) |
| return; |
| |
| CBC_QRCoderBitVector versionInfoBits; |
| MakeVersionInfoBits(version, &versionInfoBits); |
| int32_t bitIndex = 6 * 3 - 1; |
| for (int32_t i = 0; i < 6; i++) { |
| for (int32_t j = 0; j < 3; j++) { |
| int32_t bit = versionInfoBits.At(bitIndex); |
| bitIndex--; |
| matrix->Set(i, matrix->GetHeight() - 11 + j, bit); |
| matrix->Set(matrix->GetHeight() - 11 + j, i, bit); |
| } |
| } |
| } |
| |
| bool EmbedTimingPatterns(CBC_CommonByteMatrix* matrix) { |
| for (int32_t i = 8; i < matrix->GetWidth() - 8; i++) { |
| int32_t bit = (i + 1) % 2; |
| if (!IsValidValue(matrix->Get(i, 6))) |
| return false; |
| |
| if (IsEmpty(matrix->Get(i, 6))) |
| matrix->Set(i, 6, bit); |
| |
| if (!IsValidValue(matrix->Get(6, i))) |
| return false; |
| |
| if (IsEmpty(matrix->Get(6, i))) |
| matrix->Set(6, i, bit); |
| } |
| return true; |
| } |
| |
| bool EmbedDarkDotAtLeftBottomCorner(CBC_CommonByteMatrix* matrix) { |
| if (matrix->Get(8, matrix->GetHeight() - 8) == 0) |
| return false; |
| |
| matrix->Set(8, matrix->GetHeight() - 8, 1); |
| return true; |
| } |
| |
| bool EmbedHorizontalSeparationPattern(int32_t xStart, |
| int32_t yStart, |
| CBC_CommonByteMatrix* matrix) { |
| for (int32_t x = 0; x < 8; x++) { |
| if (!IsEmpty(matrix->Get(xStart + x, yStart))) |
| return false; |
| |
| matrix->Set(xStart + x, yStart, 0); |
| } |
| return true; |
| } |
| |
| bool EmbedVerticalSeparationPattern(int32_t xStart, |
| int32_t yStart, |
| CBC_CommonByteMatrix* matrix) { |
| for (int32_t y = 0; y < 7; y++) { |
| if (!IsEmpty(matrix->Get(xStart, yStart + y))) |
| return false; |
| |
| matrix->Set(xStart, yStart + y, 0); |
| } |
| return true; |
| } |
| |
| bool EmbedPositionAdjustmentPattern(int32_t xStart, |
| int32_t yStart, |
| CBC_CommonByteMatrix* matrix) { |
| for (int32_t y = 0; y < 5; y++) { |
| for (int32_t x = 0; x < 5; x++) { |
| if (!IsEmpty(matrix->Get(xStart + x, y + yStart))) |
| return false; |
| |
| matrix->Set(xStart + x, yStart + y, POSITION_ADJUSTMENT_PATTERN[y][x]); |
| } |
| } |
| return true; |
| } |
| |
| bool EmbedPositionDetectionPattern(int32_t xStart, |
| int32_t yStart, |
| CBC_CommonByteMatrix* matrix) { |
| for (int32_t y = 0; y < 7; y++) { |
| for (int32_t x = 0; x < 7; x++) { |
| if (!IsEmpty(matrix->Get(xStart + x, yStart + y))) |
| return false; |
| |
| matrix->Set(xStart + x, yStart + y, POSITION_DETECTION_PATTERN[y][x]); |
| } |
| } |
| return true; |
| } |
| |
| bool EmbedPositionDetectionPatternsAndSeparators(CBC_CommonByteMatrix* matrix) { |
| constexpr int32_t pdpWidth = 7; |
| if (!EmbedPositionDetectionPattern(0, 0, matrix)) |
| return false; |
| if (!EmbedPositionDetectionPattern(matrix->GetWidth() - pdpWidth, 0, matrix)) |
| return false; |
| if (!EmbedPositionDetectionPattern(0, matrix->GetWidth() - pdpWidth, matrix)) |
| return false; |
| |
| constexpr int32_t hspWidth = 8; |
| if (!EmbedHorizontalSeparationPattern(0, hspWidth - 1, matrix)) |
| return false; |
| if (!EmbedHorizontalSeparationPattern(matrix->GetWidth() - hspWidth, |
| hspWidth - 1, matrix)) { |
| return false; |
| } |
| if (!EmbedHorizontalSeparationPattern(0, matrix->GetWidth() - hspWidth, |
| matrix)) { |
| return false; |
| } |
| |
| constexpr int32_t vspSize = 7; |
| if (!EmbedVerticalSeparationPattern(vspSize, 0, matrix)) |
| return false; |
| if (!EmbedVerticalSeparationPattern(matrix->GetHeight() - vspSize - 1, 0, |
| matrix)) { |
| return false; |
| } |
| if (!EmbedVerticalSeparationPattern(vspSize, matrix->GetHeight() - vspSize, |
| matrix)) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool MaybeEmbedPositionAdjustmentPatterns(int32_t version, |
| CBC_CommonByteMatrix* matrix) { |
| if (version < 2) |
| return true; |
| |
| const size_t index = version - 2; |
| if (index >= pdfium::size(kPositionAdjustmentPatternCoordinates)) |
| return false; |
| |
| const auto* coordinates = &kPositionAdjustmentPatternCoordinates[index][0]; |
| for (size_t i = 0; i < kNumCoordinate; i++) { |
| const int32_t y = coordinates[i]; |
| if (y == 0) |
| break; |
| for (size_t j = 0; j < kNumCoordinate; j++) { |
| const int32_t x = coordinates[j]; |
| if (x == 0) |
| break; |
| |
| if (IsEmpty(matrix->Get(x, y))) { |
| if (!EmbedPositionAdjustmentPattern(x - 2, y - 2, matrix)) |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| bool EmbedBasicPatterns(int32_t version, CBC_CommonByteMatrix* matrix) { |
| if (!EmbedPositionDetectionPatternsAndSeparators(matrix)) |
| return false; |
| if (!EmbedDarkDotAtLeftBottomCorner(matrix)) |
| return false; |
| if (!MaybeEmbedPositionAdjustmentPatterns(version, matrix)) |
| return false; |
| if (!EmbedTimingPatterns(matrix)) |
| return false; |
| return true; |
| } |
| |
| } // namespace |
| |
| bool CBC_QRCoderMatrixUtil::BuildMatrix( |
| CBC_QRCoderBitVector* dataBits, |
| const CBC_QRCoderErrorCorrectionLevel* ecLevel, |
| int32_t version, |
| int32_t maskPattern, |
| CBC_CommonByteMatrix* matrix) { |
| if (!dataBits || !matrix) |
| return false; |
| |
| matrix->clear(0xff); |
| |
| if (!EmbedBasicPatterns(version, matrix)) |
| return false; |
| if (!EmbedTypeInfo(ecLevel, maskPattern, matrix)) |
| return false; |
| |
| MaybeEmbedVersionInfo(version, matrix); |
| return EmbedDataBits(dataBits, maskPattern, matrix); |
| } |
