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// 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 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 <array>
#include <iterator>
#include "core/fxcrt/check.h"
#include "core/fxcrt/check_op.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"
namespace {
using PositionDetectionPatternRow = std::array<uint8_t, 7>;
constexpr std::array<const PositionDetectionPatternRow, 7>
kPositionDetectionPatternTable = {{{{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}}}};
using PositionAdjustmentPatternRow = std::array<uint8_t, 5>;
constexpr std::array<const PositionAdjustmentPatternRow, 5>
kPositionAdjustmentPatternTable = {{{{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;
using PositionCoordinatePatternRow = std::array<uint8_t, kNumCoordinate>;
constexpr std::array<const PositionCoordinatePatternRow, 39>
kPositionCoordinatePatternTable = {{
{{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}},
}};
struct TypeInfoCoordinate {
uint8_t x;
uint8_t y;
};
const std::array<const TypeInfoCoordinate, 15> kTypeInfoCoordinates = {{
{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},
}};
constexpr int32_t VERSION_INFO_POLY = 0x1f25;
constexpr int32_t TYPE_INFO_POLY = 0x0537;
constexpr 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 < static_cast<int32_t>(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_EQ(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_EQ(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 = kTypeInfoCoordinates[i].x;
int32_t y1 = kTypeInfoCoordinates[i].y;
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 (size_t i = 8; i + 8 < matrix->GetWidth(); i++) {
const uint8_t bit = static_cast<uint8_t>((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,
kPositionAdjustmentPatternTable[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, kPositionDetectionPatternTable[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 >= std::size(kPositionCoordinatePatternTable)) {
return false;
}
const auto& coordinates = kPositionCoordinatePatternTable[index];
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->Fill(0xff);
if (!EmbedBasicPatterns(version, matrix))
return false;
if (!EmbedTypeInfo(ecLevel, maskPattern, matrix))
return false;
MaybeEmbedVersionInfo(version, matrix);
return EmbedDataBits(dataBits, maskPattern, matrix);
}