Adeeb Shihadeh
4 years ago
committed by
GitHub
parent
cfdeda3393
commit
05737dd550
7 changed files with 12 additions and 1421 deletions
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version https://git-lfs.github.com/spec/v1
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oid sha256:0bc2f1d4208463156f9558520af4f00a215ee183ea9426f611ab54e7c62b5691 |
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size 28562 |
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@ -0,0 +1,3 @@ |
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version https://git-lfs.github.com/spec/v1
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oid sha256:6961ccf04acda6dd6da2e542b28634ccab5ac8073163f9cb64e7713eb39712d5 |
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size 20659 |
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@ -1,862 +0,0 @@ |
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/*
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* QR Code generator library (C++) |
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*
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* Copyright (c) Project Nayuki. (MIT License) |
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* https://www.nayuki.io/page/qr-code-generator-library
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of |
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* this software and associated documentation files (the "Software"), to deal in |
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* the Software without restriction, including without limitation the rights to |
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
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* the Software, and to permit persons to whom the Software is furnished to do so, |
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* subject to the following conditions: |
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* - The above copyright notice and this permission notice shall be included in |
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* all copies or substantial portions of the Software. |
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* - The Software is provided "as is", without warranty of any kind, express or |
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* implied, including but not limited to the warranties of merchantability, |
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* fitness for a particular purpose and noninfringement. In no event shall the |
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* authors or copyright holders be liable for any claim, damages or other |
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* liability, whether in an action of contract, tort or otherwise, arising from, |
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* out of or in connection with the Software or the use or other dealings in the |
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* Software. |
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*/ |
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#include <algorithm> |
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#include <climits> |
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#include <cstddef> |
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#include <cstdlib> |
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#include <cstring> |
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#include <sstream> |
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#include <stdexcept> |
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#include <utility> |
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#include "QrCode.hpp" |
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using std::int8_t; |
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using std::uint8_t; |
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using std::size_t; |
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using std::vector; |
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namespace qrcodegen { |
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QrSegment::Mode::Mode(int mode, int cc0, int cc1, int cc2) : |
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modeBits(mode) { |
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numBitsCharCount[0] = cc0; |
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numBitsCharCount[1] = cc1; |
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numBitsCharCount[2] = cc2; |
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} |
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int QrSegment::Mode::getModeBits() const { |
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return modeBits; |
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} |
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int QrSegment::Mode::numCharCountBits(int ver) const { |
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return numBitsCharCount[(ver + 7) / 17]; |
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} |
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const QrSegment::Mode QrSegment::Mode::NUMERIC (0x1, 10, 12, 14); |
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const QrSegment::Mode QrSegment::Mode::ALPHANUMERIC(0x2, 9, 11, 13); |
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const QrSegment::Mode QrSegment::Mode::BYTE (0x4, 8, 16, 16); |
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const QrSegment::Mode QrSegment::Mode::KANJI (0x8, 8, 10, 12); |
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const QrSegment::Mode QrSegment::Mode::ECI (0x7, 0, 0, 0); |
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QrSegment QrSegment::makeBytes(const vector<uint8_t> &data) { |
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if (data.size() > static_cast<unsigned int>(INT_MAX)) |
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throw std::length_error("Data too long"); |
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BitBuffer bb; |
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for (uint8_t b : data) |
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bb.appendBits(b, 8); |
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return QrSegment(Mode::BYTE, static_cast<int>(data.size()), std::move(bb)); |
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} |
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QrSegment QrSegment::makeNumeric(const char *digits) { |
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BitBuffer bb; |
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int accumData = 0; |
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int accumCount = 0; |
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int charCount = 0; |
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for (; *digits != '\0'; digits++, charCount++) { |
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char c = *digits; |
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if (c < '0' || c > '9') |
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throw std::domain_error("String contains non-numeric characters"); |
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accumData = accumData * 10 + (c - '0'); |
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accumCount++; |
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if (accumCount == 3) { |
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bb.appendBits(static_cast<uint32_t>(accumData), 10); |
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accumData = 0; |
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accumCount = 0; |
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} |
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} |
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if (accumCount > 0) // 1 or 2 digits remaining
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bb.appendBits(static_cast<uint32_t>(accumData), accumCount * 3 + 1); |
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return QrSegment(Mode::NUMERIC, charCount, std::move(bb)); |
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} |
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QrSegment QrSegment::makeAlphanumeric(const char *text) { |
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BitBuffer bb; |
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int accumData = 0; |
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int accumCount = 0; |
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int charCount = 0; |
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for (; *text != '\0'; text++, charCount++) { |
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const char *temp = std::strchr(ALPHANUMERIC_CHARSET, *text); |
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if (temp == nullptr) |
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throw std::domain_error("String contains unencodable characters in alphanumeric mode"); |
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accumData = accumData * 45 + static_cast<int>(temp - ALPHANUMERIC_CHARSET); |
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accumCount++; |
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if (accumCount == 2) { |
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bb.appendBits(static_cast<uint32_t>(accumData), 11); |
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accumData = 0; |
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accumCount = 0; |
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} |
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} |
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if (accumCount > 0) // 1 character remaining
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bb.appendBits(static_cast<uint32_t>(accumData), 6); |
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return QrSegment(Mode::ALPHANUMERIC, charCount, std::move(bb)); |
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} |
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vector<QrSegment> QrSegment::makeSegments(const char *text) { |
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// Select the most efficient segment encoding automatically
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vector<QrSegment> result; |
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if (*text == '\0'); // Leave result empty
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else if (isNumeric(text)) |
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result.push_back(makeNumeric(text)); |
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else if (isAlphanumeric(text)) |
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result.push_back(makeAlphanumeric(text)); |
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else { |
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vector<uint8_t> bytes; |
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for (; *text != '\0'; text++) |
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bytes.push_back(static_cast<uint8_t>(*text)); |
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result.push_back(makeBytes(bytes)); |
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} |
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return result; |
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} |
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QrSegment QrSegment::makeEci(long assignVal) { |
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BitBuffer bb; |
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if (assignVal < 0) |
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throw std::domain_error("ECI assignment value out of range"); |
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else if (assignVal < (1 << 7)) |
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bb.appendBits(static_cast<uint32_t>(assignVal), 8); |
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else if (assignVal < (1 << 14)) { |
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bb.appendBits(2, 2); |
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bb.appendBits(static_cast<uint32_t>(assignVal), 14); |
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} else if (assignVal < 1000000L) { |
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bb.appendBits(6, 3); |
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bb.appendBits(static_cast<uint32_t>(assignVal), 21); |
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} else |
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throw std::domain_error("ECI assignment value out of range"); |
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return QrSegment(Mode::ECI, 0, std::move(bb)); |
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} |
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QrSegment::QrSegment(Mode md, int numCh, const std::vector<bool> &dt) : |
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mode(md), |
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numChars(numCh), |
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data(dt) { |
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if (numCh < 0) |
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throw std::domain_error("Invalid value"); |
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} |
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QrSegment::QrSegment(Mode md, int numCh, std::vector<bool> &&dt) : |
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mode(md), |
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numChars(numCh), |
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data(std::move(dt)) { |
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if (numCh < 0) |
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throw std::domain_error("Invalid value"); |
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} |
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int QrSegment::getTotalBits(const vector<QrSegment> &segs, int version) { |
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int result = 0; |
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for (const QrSegment &seg : segs) { |
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int ccbits = seg.mode.numCharCountBits(version); |
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if (seg.numChars >= (1L << ccbits)) |
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return -1; // The segment's length doesn't fit the field's bit width
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if (4 + ccbits > INT_MAX - result) |
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return -1; // The sum will overflow an int type
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result += 4 + ccbits; |
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if (seg.data.size() > static_cast<unsigned int>(INT_MAX - result)) |
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return -1; // The sum will overflow an int type
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result += static_cast<int>(seg.data.size()); |
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} |
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return result; |
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} |
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bool QrSegment::isAlphanumeric(const char *text) { |
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for (; *text != '\0'; text++) { |
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if (std::strchr(ALPHANUMERIC_CHARSET, *text) == nullptr) |
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return false; |
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} |
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return true; |
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} |
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bool QrSegment::isNumeric(const char *text) { |
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for (; *text != '\0'; text++) { |
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char c = *text; |
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if (c < '0' || c > '9') |
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return false; |
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} |
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return true; |
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} |
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QrSegment::Mode QrSegment::getMode() const { |
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return mode; |
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} |
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int QrSegment::getNumChars() const { |
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return numChars; |
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} |
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const std::vector<bool> &QrSegment::getData() const { |
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return data; |
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} |
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const char *QrSegment::ALPHANUMERIC_CHARSET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ $%*+-./:"; |
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int QrCode::getFormatBits(Ecc ecl) { |
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switch (ecl) { |
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case Ecc::LOW : return 1; |
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case Ecc::MEDIUM : return 0; |
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case Ecc::QUARTILE: return 3; |
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case Ecc::HIGH : return 2; |
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default: throw std::logic_error("Assertion error"); |
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} |
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} |
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QrCode QrCode::encodeText(const char *text, Ecc ecl) { |
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vector<QrSegment> segs = QrSegment::makeSegments(text); |
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return encodeSegments(segs, ecl); |
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} |
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QrCode QrCode::encodeBinary(const vector<uint8_t> &data, Ecc ecl) { |
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vector<QrSegment> segs{QrSegment::makeBytes(data)}; |
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return encodeSegments(segs, ecl); |
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} |
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QrCode QrCode::encodeSegments(const vector<QrSegment> &segs, Ecc ecl, |
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int minVersion, int maxVersion, int mask, bool boostEcl) { |
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if (!(MIN_VERSION <= minVersion && minVersion <= maxVersion && maxVersion <= MAX_VERSION) || mask < -1 || mask > 7) |
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throw std::invalid_argument("Invalid value"); |
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// Find the minimal version number to use
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int version, dataUsedBits; |
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for (version = minVersion; ; version++) { |
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int dataCapacityBits = getNumDataCodewords(version, ecl) * 8; // Number of data bits available
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dataUsedBits = QrSegment::getTotalBits(segs, version); |
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if (dataUsedBits != -1 && dataUsedBits <= dataCapacityBits) |
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break; // This version number is found to be suitable
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if (version >= maxVersion) { // All versions in the range could not fit the given data
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std::ostringstream sb; |
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if (dataUsedBits == -1) |
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sb << "Segment too long"; |
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else { |
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sb << "Data length = " << dataUsedBits << " bits, "; |
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sb << "Max capacity = " << dataCapacityBits << " bits"; |
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} |
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throw data_too_long(sb.str()); |
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} |
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} |
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if (dataUsedBits == -1) |
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throw std::logic_error("Assertion error"); |
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// Increase the error correction level while the data still fits in the current version number
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for (Ecc newEcl : vector<Ecc>{Ecc::MEDIUM, Ecc::QUARTILE, Ecc::HIGH}) { // From low to high
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if (boostEcl && dataUsedBits <= getNumDataCodewords(version, newEcl) * 8) |
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ecl = newEcl; |
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} |
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// Concatenate all segments to create the data bit string
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BitBuffer bb; |
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for (const QrSegment &seg : segs) { |
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bb.appendBits(static_cast<uint32_t>(seg.getMode().getModeBits()), 4); |
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bb.appendBits(static_cast<uint32_t>(seg.getNumChars()), seg.getMode().numCharCountBits(version)); |
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bb.insert(bb.end(), seg.getData().begin(), seg.getData().end()); |
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} |
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if (bb.size() != static_cast<unsigned int>(dataUsedBits)) |
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throw std::logic_error("Assertion error"); |
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// Add terminator and pad up to a byte if applicable
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size_t dataCapacityBits = static_cast<size_t>(getNumDataCodewords(version, ecl)) * 8; |
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if (bb.size() > dataCapacityBits) |
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throw std::logic_error("Assertion error"); |
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bb.appendBits(0, std::min(4, static_cast<int>(dataCapacityBits - bb.size()))); |
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bb.appendBits(0, (8 - static_cast<int>(bb.size() % 8)) % 8); |
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if (bb.size() % 8 != 0) |
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throw std::logic_error("Assertion error"); |
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// Pad with alternating bytes until data capacity is reached
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for (uint8_t padByte = 0xEC; bb.size() < dataCapacityBits; padByte ^= 0xEC ^ 0x11) |
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bb.appendBits(padByte, 8); |
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// Pack bits into bytes in big endian
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vector<uint8_t> dataCodewords(bb.size() / 8); |
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for (size_t i = 0; i < bb.size(); i++) |
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dataCodewords[i >> 3] |= (bb.at(i) ? 1 : 0) << (7 - (i & 7)); |
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// Create the QR Code object
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return QrCode(version, ecl, dataCodewords, mask); |
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} |
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QrCode::QrCode(int ver, Ecc ecl, const vector<uint8_t> &dataCodewords, int msk) : |
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// Initialize fields and check arguments
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version(ver), |
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errorCorrectionLevel(ecl) { |
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if (ver < MIN_VERSION || ver > MAX_VERSION) |
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throw std::domain_error("Version value out of range"); |
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if (msk < -1 || msk > 7) |
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throw std::domain_error("Mask value out of range"); |
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size = ver * 4 + 17; |
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size_t sz = static_cast<size_t>(size); |
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modules = vector<vector<bool> >(sz, vector<bool>(sz)); // Initially all white
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isFunction = vector<vector<bool> >(sz, vector<bool>(sz)); |
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// Compute ECC, draw modules
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drawFunctionPatterns(); |
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const vector<uint8_t> allCodewords = addEccAndInterleave(dataCodewords); |
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drawCodewords(allCodewords); |
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// Do masking
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if (msk == -1) { // Automatically choose best mask
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long minPenalty = LONG_MAX; |
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for (int i = 0; i < 8; i++) { |
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applyMask(i); |
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drawFormatBits(i); |
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long penalty = getPenaltyScore(); |
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if (penalty < minPenalty) { |
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msk = i; |
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minPenalty = penalty; |
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} |
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applyMask(i); // Undoes the mask due to XOR
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} |
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} |
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if (msk < 0 || msk > 7)//lgtm [cpp/constant-comparison]
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throw std::logic_error("Assertion error"); |
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this->mask = msk; |
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applyMask(msk); // Apply the final choice of mask
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drawFormatBits(msk); // Overwrite old format bits
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isFunction.clear(); |
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isFunction.shrink_to_fit(); |
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} |
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int QrCode::getVersion() const { |
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return version; |
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} |
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int QrCode::getSize() const { |
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return size; |
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} |
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QrCode::Ecc QrCode::getErrorCorrectionLevel() const { |
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return errorCorrectionLevel; |
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} |
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int QrCode::getMask() const { |
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return mask; |
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} |
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bool QrCode::getModule(int x, int y) const { |
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return 0 <= x && x < size && 0 <= y && y < size && module(x, y); |
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} |
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std::string QrCode::toSvgString(int border) const { |
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if (border < 0) |
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throw std::domain_error("Border must be non-negative"); |
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if (border > INT_MAX / 2 || border * 2 > INT_MAX - size) |
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throw std::overflow_error("Border too large"); |
|
||||||
|
|
||||||
std::ostringstream sb; |
|
||||||
sb << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n"; |
|
||||||
sb << "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n"; |
|
||||||
sb << "<svg xmlns=\"http://www.w3.org/2000/svg\" version=\"1.1\" viewBox=\"0 0 "; |
|
||||||
sb << (size + border * 2) << " " << (size + border * 2) << "\" stroke=\"none\">\n"; |
|
||||||
sb << "\t<rect width=\"100%\" height=\"100%\" fill=\"#FFFFFF\"/>\n"; |
|
||||||
sb << "\t<path d=\""; |
|
||||||
for (int y = 0; y < size; y++) { |
|
||||||
for (int x = 0; x < size; x++) { |
|
||||||
if (getModule(x, y)) { |
|
||||||
if (x != 0 || y != 0) |
|
||||||
sb << " "; |
|
||||||
sb << "M" << (x + border) << "," << (y + border) << "h1v1h-1z"; |
|
||||||
} |
|
||||||
} |
|
||||||
} |
|
||||||
sb << "\" fill=\"#000000\"/>\n"; |
|
||||||
sb << "</svg>\n"; |
|
||||||
return sb.str(); |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::drawFunctionPatterns() { |
|
||||||
// Draw horizontal and vertical timing patterns
|
|
||||||
for (int i = 0; i < size; i++) { |
|
||||||
setFunctionModule(6, i, i % 2 == 0); |
|
||||||
setFunctionModule(i, 6, i % 2 == 0); |
|
||||||
} |
|
||||||
|
|
||||||
// Draw 3 finder patterns (all corners except bottom right; overwrites some timing modules)
|
|
||||||
drawFinderPattern(3, 3); |
|
||||||
drawFinderPattern(size - 4, 3); |
|
||||||
drawFinderPattern(3, size - 4); |
|
||||||
|
|
||||||
// Draw numerous alignment patterns
|
|
||||||
const vector<int> alignPatPos = getAlignmentPatternPositions(); |
|
||||||
size_t numAlign = alignPatPos.size(); |
|
||||||
for (size_t i = 0; i < numAlign; i++) { |
|
||||||
for (size_t j = 0; j < numAlign; j++) { |
|
||||||
// Don't draw on the three finder corners
|
|
||||||
if (!((i == 0 && j == 0) || (i == 0 && j == numAlign - 1) || (i == numAlign - 1 && j == 0))) |
|
||||||
drawAlignmentPattern(alignPatPos.at(i), alignPatPos.at(j)); |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
// Draw configuration data
|
|
||||||
drawFormatBits(0); // Dummy mask value; overwritten later in the constructor
|
|
||||||
drawVersion(); |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::drawFormatBits(int msk) { |
|
||||||
// Calculate error correction code and pack bits
|
|
||||||
int data = getFormatBits(errorCorrectionLevel) << 3 | msk; // errCorrLvl is uint2, msk is uint3
|
|
||||||
int rem = data; |
|
||||||
for (int i = 0; i < 10; i++) |
|
||||||
rem = (rem << 1) ^ ((rem >> 9) * 0x537); |
|
||||||
int bits = (data << 10 | rem) ^ 0x5412; // uint15
|
|
||||||
if (bits >> 15 != 0) |
|
||||||
throw std::logic_error("Assertion error"); |
|
||||||
|
|
||||||
// Draw first copy
|
|
||||||
for (int i = 0; i <= 5; i++) |
|
||||||
setFunctionModule(8, i, getBit(bits, i)); |
|
||||||
setFunctionModule(8, 7, getBit(bits, 6)); |
|
||||||
setFunctionModule(8, 8, getBit(bits, 7)); |
|
||||||
setFunctionModule(7, 8, getBit(bits, 8)); |
|
||||||
for (int i = 9; i < 15; i++) |
|
||||||
setFunctionModule(14 - i, 8, getBit(bits, i)); |
|
||||||
|
|
||||||
// Draw second copy
|
|
||||||
for (int i = 0; i < 8; i++) |
|
||||||
setFunctionModule(size - 1 - i, 8, getBit(bits, i)); |
|
||||||
for (int i = 8; i < 15; i++) |
|
||||||
setFunctionModule(8, size - 15 + i, getBit(bits, i)); |
|
||||||
setFunctionModule(8, size - 8, true); // Always black
|
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::drawVersion() { |
|
||||||
if (version < 7) |
|
||||||
return; |
|
||||||
|
|
||||||
// Calculate error correction code and pack bits
|
|
||||||
int rem = version; // version is uint6, in the range [7, 40]
|
|
||||||
for (int i = 0; i < 12; i++) |
|
||||||
rem = (rem << 1) ^ ((rem >> 11) * 0x1F25); |
|
||||||
long bits = static_cast<long>(version) << 12 | rem; // uint18
|
|
||||||
if (bits >> 18 != 0) |
|
||||||
throw std::logic_error("Assertion error"); |
|
||||||
|
|
||||||
// Draw two copies
|
|
||||||
for (int i = 0; i < 18; i++) { |
|
||||||
bool bit = getBit(bits, i); |
|
||||||
int a = size - 11 + i % 3; |
|
||||||
int b = i / 3; |
|
||||||
setFunctionModule(a, b, bit); |
|
||||||
setFunctionModule(b, a, bit); |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::drawFinderPattern(int x, int y) { |
|
||||||
for (int dy = -4; dy <= 4; dy++) { |
|
||||||
for (int dx = -4; dx <= 4; dx++) { |
|
||||||
int dist = std::max(std::abs(dx), std::abs(dy)); // Chebyshev/infinity norm
|
|
||||||
int xx = x + dx, yy = y + dy; |
|
||||||
if (0 <= xx && xx < size && 0 <= yy && yy < size) |
|
||||||
setFunctionModule(xx, yy, dist != 2 && dist != 4); |
|
||||||
} |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::drawAlignmentPattern(int x, int y) { |
|
||||||
for (int dy = -2; dy <= 2; dy++) { |
|
||||||
for (int dx = -2; dx <= 2; dx++) |
|
||||||
setFunctionModule(x + dx, y + dy, std::max(std::abs(dx), std::abs(dy)) != 1); |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::setFunctionModule(int x, int y, bool isBlack) { |
|
||||||
size_t ux = static_cast<size_t>(x); |
|
||||||
size_t uy = static_cast<size_t>(y); |
|
||||||
modules .at(uy).at(ux) = isBlack; |
|
||||||
isFunction.at(uy).at(ux) = true; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
bool QrCode::module(int x, int y) const { |
|
||||||
return modules.at(static_cast<size_t>(y)).at(static_cast<size_t>(x)); |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
vector<uint8_t> QrCode::addEccAndInterleave(const vector<uint8_t> &data) const { |
|
||||||
if (data.size() != static_cast<unsigned int>(getNumDataCodewords(version, errorCorrectionLevel))) |
|
||||||
throw std::invalid_argument("Invalid argument"); |
|
||||||
|
|
||||||
// Calculate parameter numbers
|
|
||||||
int numBlocks = NUM_ERROR_CORRECTION_BLOCKS[static_cast<int>(errorCorrectionLevel)][version]; |
|
||||||
int blockEccLen = ECC_CODEWORDS_PER_BLOCK [static_cast<int>(errorCorrectionLevel)][version]; |
|
||||||
int rawCodewords = getNumRawDataModules(version) / 8; |
|
||||||
int numShortBlocks = numBlocks - rawCodewords % numBlocks; |
|
||||||
int shortBlockLen = rawCodewords / numBlocks; |
|
||||||
|
|
||||||
// Split data into blocks and append ECC to each block
|
|
||||||
vector<vector<uint8_t> > blocks; |
|
||||||
const vector<uint8_t> rsDiv = reedSolomonComputeDivisor(blockEccLen); |
|
||||||
for (int i = 0, k = 0; i < numBlocks; i++) { |
|
||||||
vector<uint8_t> dat(data.cbegin() + k, data.cbegin() + (k + shortBlockLen - blockEccLen + (i < numShortBlocks ? 0 : 1))); |
|
||||||
k += static_cast<int>(dat.size()); |
|
||||||
const vector<uint8_t> ecc = reedSolomonComputeRemainder(dat, rsDiv); |
|
||||||
if (i < numShortBlocks) |
|
||||||
dat.push_back(0); |
|
||||||
dat.insert(dat.end(), ecc.cbegin(), ecc.cend()); |
|
||||||
blocks.push_back(std::move(dat)); |
|
||||||
} |
|
||||||
|
|
||||||
// Interleave (not concatenate) the bytes from every block into a single sequence
|
|
||||||
vector<uint8_t> result; |
|
||||||
for (size_t i = 0; i < blocks.at(0).size(); i++) { |
|
||||||
for (size_t j = 0; j < blocks.size(); j++) { |
|
||||||
// Skip the padding byte in short blocks
|
|
||||||
if (i != static_cast<unsigned int>(shortBlockLen - blockEccLen) || j >= static_cast<unsigned int>(numShortBlocks)) |
|
||||||
result.push_back(blocks.at(j).at(i)); |
|
||||||
} |
|
||||||
} |
|
||||||
if (result.size() != static_cast<unsigned int>(rawCodewords)) |
|
||||||
throw std::logic_error("Assertion error"); |
|
||||||
return result; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::drawCodewords(const vector<uint8_t> &data) { |
|
||||||
if (data.size() != static_cast<unsigned int>(getNumRawDataModules(version) / 8)) |
|
||||||
throw std::invalid_argument("Invalid argument"); |
|
||||||
|
|
||||||
size_t i = 0; // Bit index into the data
|
|
||||||
// Do the funny zigzag scan
|
|
||||||
for (int right = size - 1; right >= 1; right -= 2) { // Index of right column in each column pair
|
|
||||||
if (right == 6) |
|
||||||
right = 5; |
|
||||||
for (int vert = 0; vert < size; vert++) { // Vertical counter
|
|
||||||
for (int j = 0; j < 2; j++) { |
|
||||||
size_t x = static_cast<size_t>(right - j); // Actual x coordinate
|
|
||||||
bool upward = ((right + 1) & 2) == 0; |
|
||||||
size_t y = static_cast<size_t>(upward ? size - 1 - vert : vert); // Actual y coordinate
|
|
||||||
if (!isFunction.at(y).at(x) && i < data.size() * 8) { |
|
||||||
modules.at(y).at(x) = getBit(data.at(i >> 3), 7 - static_cast<int>(i & 7)); |
|
||||||
i++; |
|
||||||
} |
|
||||||
// If this QR Code has any remainder bits (0 to 7), they were assigned as
|
|
||||||
// 0/false/white by the constructor and are left unchanged by this method
|
|
||||||
} |
|
||||||
} |
|
||||||
} |
|
||||||
if (i != data.size() * 8) |
|
||||||
throw std::logic_error("Assertion error"); |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::applyMask(int msk) { |
|
||||||
if (msk < 0 || msk > 7) |
|
||||||
throw std::domain_error("Mask value out of range"); |
|
||||||
size_t sz = static_cast<size_t>(size); |
|
||||||
for (size_t y = 0; y < sz; y++) { |
|
||||||
for (size_t x = 0; x < sz; x++) { |
|
||||||
bool invert; |
|
||||||
switch (msk) { |
|
||||||
case 0: invert = (x + y) % 2 == 0; break; |
|
||||||
case 1: invert = y % 2 == 0; break; |
|
||||||
case 2: invert = x % 3 == 0; break; |
|
||||||
case 3: invert = (x + y) % 3 == 0; break; |
|
||||||
case 4: invert = (x / 3 + y / 2) % 2 == 0; break; |
|
||||||
case 5: invert = x * y % 2 + x * y % 3 == 0; break; |
|
||||||
case 6: invert = (x * y % 2 + x * y % 3) % 2 == 0; break; |
|
||||||
case 7: invert = ((x + y) % 2 + x * y % 3) % 2 == 0; break; |
|
||||||
default: throw std::logic_error("Assertion error"); |
|
||||||
} |
|
||||||
modules.at(y).at(x) = modules.at(y).at(x) ^ (invert & !isFunction.at(y).at(x)); |
|
||||||
} |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
long QrCode::getPenaltyScore() const { |
|
||||||
long result = 0; |
|
||||||
|
|
||||||
// Adjacent modules in row having same color, and finder-like patterns
|
|
||||||
for (int y = 0; y < size; y++) { |
|
||||||
bool runColor = false; |
|
||||||
int runX = 0; |
|
||||||
std::array<int,7> runHistory = {}; |
|
||||||
for (int x = 0; x < size; x++) { |
|
||||||
if (module(x, y) == runColor) { |
|
||||||
runX++; |
|
||||||
if (runX == 5) |
|
||||||
result += PENALTY_N1; |
|
||||||
else if (runX > 5) |
|
||||||
result++; |
|
||||||
} else { |
|
||||||
finderPenaltyAddHistory(runX, runHistory); |
|
||||||
if (!runColor) |
|
||||||
result += finderPenaltyCountPatterns(runHistory) * PENALTY_N3;//lgtm [cpp/integer-multiplication-cast-to-long]
|
|
||||||
runColor = module(x, y); |
|
||||||
runX = 1; |
|
||||||
} |
|
||||||
} |
|
||||||
result += finderPenaltyTerminateAndCount(runColor, runX, runHistory) * PENALTY_N3;//lgtm [cpp/integer-multiplication-cast-to-long]
|
|
||||||
} |
|
||||||
// Adjacent modules in column having same color, and finder-like patterns
|
|
||||||
for (int x = 0; x < size; x++) { |
|
||||||
bool runColor = false; |
|
||||||
int runY = 0; |
|
||||||
std::array<int,7> runHistory = {}; |
|
||||||
for (int y = 0; y < size; y++) { |
|
||||||
if (module(x, y) == runColor) { |
|
||||||
runY++; |
|
||||||
if (runY == 5) |
|
||||||
result += PENALTY_N1; |
|
||||||
else if (runY > 5) |
|
||||||
result++; |
|
||||||
} else { |
|
||||||
finderPenaltyAddHistory(runY, runHistory); |
|
||||||
if (!runColor) |
|
||||||
result += finderPenaltyCountPatterns(runHistory) * PENALTY_N3;//lgtm [cpp/integer-multiplication-cast-to-long]
|
|
||||||
runColor = module(x, y); |
|
||||||
runY = 1; |
|
||||||
} |
|
||||||
} |
|
||||||
result += finderPenaltyTerminateAndCount(runColor, runY, runHistory) * PENALTY_N3;//lgtm [cpp/integer-multiplication-cast-to-long]
|
|
||||||
} |
|
||||||
|
|
||||||
// 2*2 blocks of modules having same color
|
|
||||||
for (int y = 0; y < size - 1; y++) { |
|
||||||
for (int x = 0; x < size - 1; x++) { |
|
||||||
bool color = module(x, y); |
|
||||||
if ( color == module(x + 1, y) && |
|
||||||
color == module(x, y + 1) && |
|
||||||
color == module(x + 1, y + 1)) |
|
||||||
result += PENALTY_N2; |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
// Balance of black and white modules
|
|
||||||
int black = 0; |
|
||||||
for (const vector<bool> &row : modules) { |
|
||||||
for (bool color : row) { |
|
||||||
if (color) |
|
||||||
black++; |
|
||||||
} |
|
||||||
} |
|
||||||
int total = size * size; // Note that size is odd, so black/total != 1/2
|
|
||||||
// Compute the smallest integer k >= 0 such that (45-5k)% <= black/total <= (55+5k)%
|
|
||||||
int k = static_cast<int>((std::abs(black * 20L - total * 10L) + total - 1) / total) - 1; |
|
||||||
result += k * PENALTY_N4; |
|
||||||
return result; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
vector<int> QrCode::getAlignmentPatternPositions() const { |
|
||||||
if (version == 1) |
|
||||||
return vector<int>(); |
|
||||||
else { |
|
||||||
int numAlign = version / 7 + 2; |
|
||||||
int step = (version == 32) ? 26 : |
|
||||||
(version*4 + numAlign*2 + 1) / (numAlign*2 - 2) * 2; |
|
||||||
vector<int> result; |
|
||||||
for (int i = 0, pos = size - 7; i < numAlign - 1; i++, pos -= step) |
|
||||||
result.insert(result.begin(), pos); |
|
||||||
result.insert(result.begin(), 6); |
|
||||||
return result; |
|
||||||
} |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
int QrCode::getNumRawDataModules(int ver) { |
|
||||||
if (ver < MIN_VERSION || ver > MAX_VERSION) |
|
||||||
throw std::domain_error("Version number out of range"); |
|
||||||
int result = (16 * ver + 128) * ver + 64; |
|
||||||
if (ver >= 2) { |
|
||||||
int numAlign = ver / 7 + 2; |
|
||||||
result -= (25 * numAlign - 10) * numAlign - 55; |
|
||||||
if (ver >= 7) |
|
||||||
result -= 36; |
|
||||||
} |
|
||||||
if (!(208 <= result && result <= 29648)) |
|
||||||
throw std::logic_error("Assertion error"); |
|
||||||
return result; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
int QrCode::getNumDataCodewords(int ver, Ecc ecl) { |
|
||||||
return getNumRawDataModules(ver) / 8 |
|
||||||
- ECC_CODEWORDS_PER_BLOCK [static_cast<int>(ecl)][ver] |
|
||||||
* NUM_ERROR_CORRECTION_BLOCKS[static_cast<int>(ecl)][ver]; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
vector<uint8_t> QrCode::reedSolomonComputeDivisor(int degree) { |
|
||||||
if (degree < 1 || degree > 255) |
|
||||||
throw std::domain_error("Degree out of range"); |
|
||||||
// Polynomial coefficients are stored from highest to lowest power, excluding the leading term which is always 1.
|
|
||||||
// For example the polynomial x^3 + 255x^2 + 8x + 93 is stored as the uint8 array {255, 8, 93}.
|
|
||||||
vector<uint8_t> result(static_cast<size_t>(degree)); |
|
||||||
result.at(result.size() - 1) = 1; // Start off with the monomial x^0
|
|
||||||
|
|
||||||
// Compute the product polynomial (x - r^0) * (x - r^1) * (x - r^2) * ... * (x - r^{degree-1}),
|
|
||||||
// and drop the highest monomial term which is always 1x^degree.
|
|
||||||
// Note that r = 0x02, which is a generator element of this field GF(2^8/0x11D).
|
|
||||||
uint8_t root = 1; |
|
||||||
for (int i = 0; i < degree; i++) { |
|
||||||
// Multiply the current product by (x - r^i)
|
|
||||||
for (size_t j = 0; j < result.size(); j++) { |
|
||||||
result.at(j) = reedSolomonMultiply(result.at(j), root); |
|
||||||
if (j + 1 < result.size()) |
|
||||||
result.at(j) ^= result.at(j + 1); |
|
||||||
} |
|
||||||
root = reedSolomonMultiply(root, 0x02); |
|
||||||
} |
|
||||||
return result; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
vector<uint8_t> QrCode::reedSolomonComputeRemainder(const vector<uint8_t> &data, const vector<uint8_t> &divisor) { |
|
||||||
vector<uint8_t> result(divisor.size()); |
|
||||||
for (uint8_t b : data) { // Polynomial division
|
|
||||||
uint8_t factor = b ^ result.at(0); |
|
||||||
result.erase(result.begin()); |
|
||||||
result.push_back(0); |
|
||||||
for (size_t i = 0; i < result.size(); i++) |
|
||||||
result.at(i) ^= reedSolomonMultiply(divisor.at(i), factor); |
|
||||||
} |
|
||||||
return result; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
uint8_t QrCode::reedSolomonMultiply(uint8_t x, uint8_t y) { |
|
||||||
// Russian peasant multiplication
|
|
||||||
int z = 0; |
|
||||||
for (int i = 7; i >= 0; i--) { |
|
||||||
z = (z << 1) ^ ((z >> 7) * 0x11D); |
|
||||||
z ^= ((y >> i) & 1) * x; |
|
||||||
} |
|
||||||
if (z >> 8 != 0) |
|
||||||
throw std::logic_error("Assertion error"); |
|
||||||
return static_cast<uint8_t>(z); |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
int QrCode::finderPenaltyCountPatterns(const std::array<int,7> &runHistory) const { |
|
||||||
int n = runHistory.at(1); |
|
||||||
if (n > size * 3) |
|
||||||
throw std::logic_error("Assertion error"); |
|
||||||
bool core = n > 0 && runHistory.at(2) == n && runHistory.at(3) == n * 3 && runHistory.at(4) == n && runHistory.at(5) == n; |
|
||||||
return (core && runHistory.at(0) >= n * 4 && runHistory.at(6) >= n ? 1 : 0) |
|
||||||
+ (core && runHistory.at(6) >= n * 4 && runHistory.at(0) >= n ? 1 : 0); |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
int QrCode::finderPenaltyTerminateAndCount(bool currentRunColor, int currentRunLength, std::array<int,7> &runHistory) const { |
|
||||||
if (currentRunColor) { // Terminate black run
|
|
||||||
finderPenaltyAddHistory(currentRunLength, runHistory); |
|
||||||
currentRunLength = 0; |
|
||||||
} |
|
||||||
currentRunLength += size; // Add white border to final run
|
|
||||||
finderPenaltyAddHistory(currentRunLength, runHistory); |
|
||||||
return finderPenaltyCountPatterns(runHistory); |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
void QrCode::finderPenaltyAddHistory(int currentRunLength, std::array<int,7> &runHistory) const { |
|
||||||
if (runHistory.at(0) == 0) |
|
||||||
currentRunLength += size; // Add white border to initial run
|
|
||||||
std::copy_backward(runHistory.cbegin(), runHistory.cend() - 1, runHistory.end()); |
|
||||||
runHistory.at(0) = currentRunLength; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
bool QrCode::getBit(long x, int i) { |
|
||||||
return ((x >> i) & 1) != 0; |
|
||||||
} |
|
||||||
|
|
||||||
|
|
||||||
/*---- Tables of constants ----*/ |
|
||||||
|
|
||||||
const int QrCode::PENALTY_N1 = 3; |
|
||||||
const int QrCode::PENALTY_N2 = 3; |
|
||||||
const int QrCode::PENALTY_N3 = 40; |
|
||||||
const int QrCode::PENALTY_N4 = 10; |
|
||||||
|
|
||||||
|
|
||||||
const int8_t QrCode::ECC_CODEWORDS_PER_BLOCK[4][41] = { |
|
||||||
// Version: (note that index 0 is for padding, and is set to an illegal value)
|
|
||||||
//0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level
|
|
||||||
{-1, 7, 10, 15, 20, 26, 18, 20, 24, 30, 18, 20, 24, 26, 30, 22, 24, 28, 30, 28, 28, 28, 28, 30, 30, 26, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // Low
|
|
||||||
{-1, 10, 16, 26, 18, 24, 16, 18, 22, 22, 26, 30, 22, 22, 24, 24, 28, 28, 26, 26, 26, 26, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28}, // Medium
|
|
||||||
{-1, 13, 22, 18, 26, 18, 24, 18, 22, 20, 24, 28, 26, 24, 20, 30, 24, 28, 28, 26, 30, 28, 30, 30, 30, 30, 28, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // Quartile
|
|
||||||
{-1, 17, 28, 22, 16, 22, 28, 26, 26, 24, 28, 24, 28, 22, 24, 24, 30, 28, 28, 26, 28, 30, 24, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30, 30}, // High
|
|
||||||
}; |
|
||||||
|
|
||||||
const int8_t QrCode::NUM_ERROR_CORRECTION_BLOCKS[4][41] = { |
|
||||||
// Version: (note that index 0 is for padding, and is set to an illegal value)
|
|
||||||
//0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40 Error correction level
|
|
||||||
{-1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 4, 4, 4, 4, 4, 6, 6, 6, 6, 7, 8, 8, 9, 9, 10, 12, 12, 12, 13, 14, 15, 16, 17, 18, 19, 19, 20, 21, 22, 24, 25}, // Low
|
|
||||||
{-1, 1, 1, 1, 2, 2, 4, 4, 4, 5, 5, 5, 8, 9, 9, 10, 10, 11, 13, 14, 16, 17, 17, 18, 20, 21, 23, 25, 26, 28, 29, 31, 33, 35, 37, 38, 40, 43, 45, 47, 49}, // Medium
|
|
||||||
{-1, 1, 1, 2, 2, 4, 4, 6, 6, 8, 8, 8, 10, 12, 16, 12, 17, 16, 18, 21, 20, 23, 23, 25, 27, 29, 34, 34, 35, 38, 40, 43, 45, 48, 51, 53, 56, 59, 62, 65, 68}, // Quartile
|
|
||||||
{-1, 1, 1, 2, 4, 4, 4, 5, 6, 8, 8, 11, 11, 16, 16, 18, 16, 19, 21, 25, 25, 25, 34, 30, 32, 35, 37, 40, 42, 45, 48, 51, 54, 57, 60, 63, 66, 70, 74, 77, 81}, // High
|
|
||||||
}; |
|
||||||
|
|
||||||
|
|
||||||
data_too_long::data_too_long(const std::string &msg) : |
|
||||||
std::length_error(msg) {} |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
BitBuffer::BitBuffer() |
|
||||||
: std::vector<bool>() {} |
|
||||||
|
|
||||||
|
|
||||||
void BitBuffer::appendBits(std::uint32_t val, int len) { |
|
||||||
if (len < 0 || len > 31 || val >> len != 0) |
|
||||||
throw std::domain_error("Value out of range"); |
|
||||||
for (int i = len - 1; i >= 0; i--) // Append bit by bit
|
|
||||||
this->push_back(((val >> i) & 1) != 0); |
|
||||||
} |
|
||||||
|
|
||||||
} |
|
||||||
@ -1,556 +0,0 @@ |
|||||||
/*
|
|
||||||
* QR Code generator library (C++) |
|
||||||
*
|
|
||||||
* Copyright (c) Project Nayuki. (MIT License) |
|
||||||
* https://www.nayuki.io/page/qr-code-generator-library
|
|
||||||
*
|
|
||||||
* Permission is hereby granted, free of charge, to any person obtaining a copy of |
|
||||||
* this software and associated documentation files (the "Software"), to deal in |
|
||||||
* the Software without restriction, including without limitation the rights to |
|
||||||
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of |
|
||||||
* the Software, and to permit persons to whom the Software is furnished to do so, |
|
||||||
* subject to the following conditions: |
|
||||||
* - The above copyright notice and this permission notice shall be included in |
|
||||||
* all copies or substantial portions of the Software. |
|
||||||
* - The Software is provided "as is", without warranty of any kind, express or |
|
||||||
* implied, including but not limited to the warranties of merchantability, |
|
||||||
* fitness for a particular purpose and noninfringement. In no event shall the |
|
||||||
* authors or copyright holders be liable for any claim, damages or other |
|
||||||
* liability, whether in an action of contract, tort or otherwise, arising from, |
|
||||||
* out of or in connection with the Software or the use or other dealings in the |
|
||||||
* Software. |
|
||||||
*/ |
|
||||||
|
|
||||||
#pragma once |
|
||||||
|
|
||||||
#include <array> |
|
||||||
#include <cstdint> |
|
||||||
#include <stdexcept> |
|
||||||
#include <string> |
|
||||||
#include <vector> |
|
||||||
|
|
||||||
|
|
||||||
namespace qrcodegen { |
|
||||||
|
|
||||||
/*
|
|
||||||
* A segment of character/binary/control data in a QR Code symbol. |
|
||||||
* Instances of this class are immutable. |
|
||||||
* The mid-level way to create a segment is to take the payload data |
|
||||||
* and call a static factory function such as QrSegment::makeNumeric(). |
|
||||||
* The low-level way to create a segment is to custom-make the bit buffer |
|
||||||
* and call the QrSegment() constructor with appropriate values. |
|
||||||
* This segment class imposes no length restrictions, but QR Codes have restrictions. |
|
||||||
* Even in the most favorable conditions, a QR Code can only hold 7089 characters of data. |
|
||||||
* Any segment longer than this is meaningless for the purpose of generating QR Codes. |
|
||||||
*/ |
|
||||||
class QrSegment final { |
|
||||||
|
|
||||||
/*---- Public helper enumeration ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Describes how a segment's data bits are interpreted. Immutable. |
|
||||||
*/ |
|
||||||
public: class Mode final { |
|
||||||
|
|
||||||
/*-- Constants --*/ |
|
||||||
|
|
||||||
public: static const Mode NUMERIC; |
|
||||||
public: static const Mode ALPHANUMERIC; |
|
||||||
public: static const Mode BYTE; |
|
||||||
public: static const Mode KANJI; |
|
||||||
public: static const Mode ECI; |
|
||||||
|
|
||||||
|
|
||||||
/*-- Fields --*/ |
|
||||||
|
|
||||||
// The mode indicator bits, which is a uint4 value (range 0 to 15).
|
|
||||||
private: int modeBits; |
|
||||||
|
|
||||||
// Number of character count bits for three different version ranges.
|
|
||||||
private: int numBitsCharCount[3]; |
|
||||||
|
|
||||||
|
|
||||||
/*-- Constructor --*/ |
|
||||||
|
|
||||||
private: Mode(int mode, int cc0, int cc1, int cc2); |
|
||||||
|
|
||||||
|
|
||||||
/*-- Methods --*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* (Package-private) Returns the mode indicator bits, which is an unsigned 4-bit value (range 0 to 15). |
|
||||||
*/ |
|
||||||
public: int getModeBits() const; |
|
||||||
|
|
||||||
/*
|
|
||||||
* (Package-private) Returns the bit width of the character count field for a segment in |
|
||||||
* this mode in a QR Code at the given version number. The result is in the range [0, 16]. |
|
||||||
*/ |
|
||||||
public: int numCharCountBits(int ver) const; |
|
||||||
|
|
||||||
}; |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Static factory functions (mid level) ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a segment representing the given binary data encoded in |
|
||||||
* byte mode. All input byte vectors are acceptable. Any text string |
|
||||||
* can be converted to UTF-8 bytes and encoded as a byte mode segment. |
|
||||||
*/ |
|
||||||
public: static QrSegment makeBytes(const std::vector<std::uint8_t> &data); |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a segment representing the given string of decimal digits encoded in numeric mode. |
|
||||||
*/ |
|
||||||
public: static QrSegment makeNumeric(const char *digits); |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a segment representing the given text string encoded in alphanumeric mode. |
|
||||||
* The characters allowed are: 0 to 9, A to Z (uppercase only), space, |
|
||||||
* dollar, percent, asterisk, plus, hyphen, period, slash, colon. |
|
||||||
*/ |
|
||||||
public: static QrSegment makeAlphanumeric(const char *text); |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a list of zero or more segments to represent the given text string. The result |
|
||||||
* may use various segment modes and switch modes to optimize the length of the bit stream. |
|
||||||
*/ |
|
||||||
public: static std::vector<QrSegment> makeSegments(const char *text); |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a segment representing an Extended Channel Interpretation |
|
||||||
* (ECI) designator with the given assignment value. |
|
||||||
*/ |
|
||||||
public: static QrSegment makeEci(long assignVal); |
|
||||||
|
|
||||||
|
|
||||||
/*---- Public static helper functions ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Tests whether the given string can be encoded as a segment in alphanumeric mode. |
|
||||||
* A string is encodable iff each character is in the following set: 0 to 9, A to Z |
|
||||||
* (uppercase only), space, dollar, percent, asterisk, plus, hyphen, period, slash, colon. |
|
||||||
*/ |
|
||||||
public: static bool isAlphanumeric(const char *text); |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Tests whether the given string can be encoded as a segment in numeric mode. |
|
||||||
* A string is encodable iff each character is in the range 0 to 9. |
|
||||||
*/ |
|
||||||
public: static bool isNumeric(const char *text); |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Instance fields ----*/ |
|
||||||
|
|
||||||
/* The mode indicator of this segment. Accessed through getMode(). */ |
|
||||||
private: Mode mode; |
|
||||||
|
|
||||||
/* The length of this segment's unencoded data. Measured in characters for
|
|
||||||
* numeric/alphanumeric/kanji mode, bytes for byte mode, and 0 for ECI mode. |
|
||||||
* Always zero or positive. Not the same as the data's bit length. |
|
||||||
* Accessed through getNumChars(). */ |
|
||||||
private: int numChars; |
|
||||||
|
|
||||||
/* The data bits of this segment. Accessed through getData(). */ |
|
||||||
private: std::vector<bool> data; |
|
||||||
|
|
||||||
|
|
||||||
/*---- Constructors (low level) ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Creates a new QR Code segment with the given attributes and data. |
|
||||||
* The character count (numCh) must agree with the mode and the bit buffer length, |
|
||||||
* but the constraint isn't checked. The given bit buffer is copied and stored. |
|
||||||
*/ |
|
||||||
public: QrSegment(Mode md, int numCh, const std::vector<bool> &dt); |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Creates a new QR Code segment with the given parameters and data. |
|
||||||
* The character count (numCh) must agree with the mode and the bit buffer length, |
|
||||||
* but the constraint isn't checked. The given bit buffer is moved and stored. |
|
||||||
*/ |
|
||||||
public: QrSegment(Mode md, int numCh, std::vector<bool> &&dt); |
|
||||||
|
|
||||||
|
|
||||||
/*---- Methods ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns the mode field of this segment. |
|
||||||
*/ |
|
||||||
public: Mode getMode() const; |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns the character count field of this segment. |
|
||||||
*/ |
|
||||||
public: int getNumChars() const; |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns the data bits of this segment. |
|
||||||
*/ |
|
||||||
public: const std::vector<bool> &getData() const; |
|
||||||
|
|
||||||
|
|
||||||
// (Package-private) Calculates the number of bits needed to encode the given segments at
|
|
||||||
// the given version. Returns a non-negative number if successful. Otherwise returns -1 if a
|
|
||||||
// segment has too many characters to fit its length field, or the total bits exceeds INT_MAX.
|
|
||||||
public: static int getTotalBits(const std::vector<QrSegment> &segs, int version); |
|
||||||
|
|
||||||
|
|
||||||
/*---- Private constant ----*/ |
|
||||||
|
|
||||||
/* The set of all legal characters in alphanumeric mode, where
|
|
||||||
* each character value maps to the index in the string. */ |
|
||||||
private: static const char *ALPHANUMERIC_CHARSET; |
|
||||||
|
|
||||||
}; |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* A QR Code symbol, which is a type of two-dimension barcode. |
|
||||||
* Invented by Denso Wave and described in the ISO/IEC 18004 standard. |
|
||||||
* Instances of this class represent an immutable square grid of black and white cells. |
|
||||||
* The class provides static factory functions to create a QR Code from text or binary data. |
|
||||||
* The class covers the QR Code Model 2 specification, supporting all versions (sizes) |
|
||||||
* from 1 to 40, all 4 error correction levels, and 4 character encoding modes. |
|
||||||
*
|
|
||||||
* Ways to create a QR Code object: |
|
||||||
* - High level: Take the payload data and call QrCode::encodeText() or QrCode::encodeBinary(). |
|
||||||
* - Mid level: Custom-make the list of segments and call QrCode::encodeSegments(). |
|
||||||
* - Low level: Custom-make the array of data codeword bytes (including |
|
||||||
* segment headers and final padding, excluding error correction codewords), |
|
||||||
* supply the appropriate version number, and call the QrCode() constructor. |
|
||||||
* (Note that all ways require supplying the desired error correction level.) |
|
||||||
*/ |
|
||||||
class QrCode final { |
|
||||||
|
|
||||||
/*---- Public helper enumeration ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* The error correction level in a QR Code symbol. |
|
||||||
*/ |
|
||||||
public: enum class Ecc { |
|
||||||
LOW = 0 , // The QR Code can tolerate about 7% erroneous codewords
|
|
||||||
MEDIUM , // The QR Code can tolerate about 15% erroneous codewords
|
|
||||||
QUARTILE, // The QR Code can tolerate about 25% erroneous codewords
|
|
||||||
HIGH , // The QR Code can tolerate about 30% erroneous codewords
|
|
||||||
}; |
|
||||||
|
|
||||||
|
|
||||||
// Returns a value in the range 0 to 3 (unsigned 2-bit integer).
|
|
||||||
private: static int getFormatBits(Ecc ecl); |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Static factory functions (high level) ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a QR Code representing the given Unicode text string at the given error correction level. |
|
||||||
* As a conservative upper bound, this function is guaranteed to succeed for strings that have 2953 or fewer |
|
||||||
* UTF-8 code units (not Unicode code points) if the low error correction level is used. The smallest possible |
|
||||||
* QR Code version is automatically chosen for the output. The ECC level of the result may be higher than |
|
||||||
* the ecl argument if it can be done without increasing the version. |
|
||||||
*/ |
|
||||||
public: static QrCode encodeText(const char *text, Ecc ecl); |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a QR Code representing the given binary data at the given error correction level. |
|
||||||
* This function always encodes using the binary segment mode, not any text mode. The maximum number of |
|
||||||
* bytes allowed is 2953. The smallest possible QR Code version is automatically chosen for the output. |
|
||||||
* The ECC level of the result may be higher than the ecl argument if it can be done without increasing the version. |
|
||||||
*/ |
|
||||||
public: static QrCode encodeBinary(const std::vector<std::uint8_t> &data, Ecc ecl); |
|
||||||
|
|
||||||
|
|
||||||
/*---- Static factory functions (mid level) ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a QR Code representing the given segments with the given encoding parameters. |
|
||||||
* The smallest possible QR Code version within the given range is automatically |
|
||||||
* chosen for the output. Iff boostEcl is true, then the ECC level of the result |
|
||||||
* may be higher than the ecl argument if it can be done without increasing the |
|
||||||
* version. The mask number is either between 0 to 7 (inclusive) to force that |
|
||||||
* mask, or -1 to automatically choose an appropriate mask (which may be slow). |
|
||||||
* This function allows the user to create a custom sequence of segments that switches |
|
||||||
* between modes (such as alphanumeric and byte) to encode text in less space. |
|
||||||
* This is a mid-level API; the high-level API is encodeText() and encodeBinary(). |
|
||||||
*/ |
|
||||||
public: static QrCode encodeSegments(const std::vector<QrSegment> &segs, Ecc ecl, |
|
||||||
int minVersion=1, int maxVersion=40, int mask=-1, bool boostEcl=true); // All optional parameters
|
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Instance fields ----*/ |
|
||||||
|
|
||||||
// Immutable scalar parameters:
|
|
||||||
|
|
||||||
/* The version number of this QR Code, which is between 1 and 40 (inclusive).
|
|
||||||
* This determines the size of this barcode. */ |
|
||||||
private: int version; |
|
||||||
|
|
||||||
/* The width and height of this QR Code, measured in modules, between
|
|
||||||
* 21 and 177 (inclusive). This is equal to version * 4 + 17. */ |
|
||||||
private: int size; |
|
||||||
|
|
||||||
/* The error correction level used in this QR Code. */ |
|
||||||
private: Ecc errorCorrectionLevel; |
|
||||||
|
|
||||||
/* The index of the mask pattern used in this QR Code, which is between 0 and 7 (inclusive).
|
|
||||||
* Even if a QR Code is created with automatic masking requested (mask = -1), |
|
||||||
* the resulting object still has a mask value between 0 and 7. */ |
|
||||||
private: int mask; |
|
||||||
|
|
||||||
// Private grids of modules/pixels, with dimensions of size*size:
|
|
||||||
|
|
||||||
// The modules of this QR Code (false = white, true = black).
|
|
||||||
// Immutable after constructor finishes. Accessed through getModule().
|
|
||||||
private: std::vector<std::vector<bool> > modules; |
|
||||||
|
|
||||||
// Indicates function modules that are not subjected to masking. Discarded when constructor finishes.
|
|
||||||
private: std::vector<std::vector<bool> > isFunction; |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Constructor (low level) ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Creates a new QR Code with the given version number, |
|
||||||
* error correction level, data codeword bytes, and mask number. |
|
||||||
* This is a low-level API that most users should not use directly. |
|
||||||
* A mid-level API is the encodeSegments() function. |
|
||||||
*/ |
|
||||||
public: QrCode(int ver, Ecc ecl, const std::vector<std::uint8_t> &dataCodewords, int msk); |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Public instance methods ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns this QR Code's version, in the range [1, 40]. |
|
||||||
*/ |
|
||||||
public: int getVersion() const; |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns this QR Code's size, in the range [21, 177]. |
|
||||||
*/ |
|
||||||
public: int getSize() const; |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns this QR Code's error correction level. |
|
||||||
*/ |
|
||||||
public: Ecc getErrorCorrectionLevel() const; |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns this QR Code's mask, in the range [0, 7]. |
|
||||||
*/ |
|
||||||
public: int getMask() const; |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns the color of the module (pixel) at the given coordinates, which is false |
|
||||||
* for white or true for black. The top left corner has the coordinates (x=0, y=0). |
|
||||||
* If the given coordinates are out of bounds, then false (white) is returned. |
|
||||||
*/ |
|
||||||
public: bool getModule(int x, int y) const; |
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Returns a string of SVG code for an image depicting this QR Code, with the given number |
|
||||||
* of border modules. The string always uses Unix newlines (\n), regardless of the platform. |
|
||||||
*/ |
|
||||||
public: std::string toSvgString(int border) const; |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Private helper methods for constructor: Drawing function modules ----*/ |
|
||||||
|
|
||||||
// Reads this object's version field, and draws and marks all function modules.
|
|
||||||
private: void drawFunctionPatterns(); |
|
||||||
|
|
||||||
|
|
||||||
// Draws two copies of the format bits (with its own error correction code)
|
|
||||||
// based on the given mask and this object's error correction level field.
|
|
||||||
private: void drawFormatBits(int msk); |
|
||||||
|
|
||||||
|
|
||||||
// Draws two copies of the version bits (with its own error correction code),
|
|
||||||
// based on this object's version field, iff 7 <= version <= 40.
|
|
||||||
private: void drawVersion(); |
|
||||||
|
|
||||||
|
|
||||||
// Draws a 9*9 finder pattern including the border separator,
|
|
||||||
// with the center module at (x, y). Modules can be out of bounds.
|
|
||||||
private: void drawFinderPattern(int x, int y); |
|
||||||
|
|
||||||
|
|
||||||
// Draws a 5*5 alignment pattern, with the center module
|
|
||||||
// at (x, y). All modules must be in bounds.
|
|
||||||
private: void drawAlignmentPattern(int x, int y); |
|
||||||
|
|
||||||
|
|
||||||
// Sets the color of a module and marks it as a function module.
|
|
||||||
// Only used by the constructor. Coordinates must be in bounds.
|
|
||||||
private: void setFunctionModule(int x, int y, bool isBlack); |
|
||||||
|
|
||||||
|
|
||||||
// Returns the color of the module at the given coordinates, which must be in range.
|
|
||||||
private: bool module(int x, int y) const; |
|
||||||
|
|
||||||
|
|
||||||
/*---- Private helper methods for constructor: Codewords and masking ----*/ |
|
||||||
|
|
||||||
// Returns a new byte string representing the given data with the appropriate error correction
|
|
||||||
// codewords appended to it, based on this object's version and error correction level.
|
|
||||||
private: std::vector<std::uint8_t> addEccAndInterleave(const std::vector<std::uint8_t> &data) const; |
|
||||||
|
|
||||||
|
|
||||||
// Draws the given sequence of 8-bit codewords (data and error correction) onto the entire
|
|
||||||
// data area of this QR Code. Function modules need to be marked off before this is called.
|
|
||||||
private: void drawCodewords(const std::vector<std::uint8_t> &data); |
|
||||||
|
|
||||||
|
|
||||||
// XORs the codeword modules in this QR Code with the given mask pattern.
|
|
||||||
// The function modules must be marked and the codeword bits must be drawn
|
|
||||||
// before masking. Due to the arithmetic of XOR, calling applyMask() with
|
|
||||||
// the same mask value a second time will undo the mask. A final well-formed
|
|
||||||
// QR Code needs exactly one (not zero, two, etc.) mask applied.
|
|
||||||
private: void applyMask(int msk); |
|
||||||
|
|
||||||
|
|
||||||
// Calculates and returns the penalty score based on state of this QR Code's current modules.
|
|
||||||
// This is used by the automatic mask choice algorithm to find the mask pattern that yields the lowest score.
|
|
||||||
private: long getPenaltyScore() const; |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Private helper functions ----*/ |
|
||||||
|
|
||||||
// Returns an ascending list of positions of alignment patterns for this version number.
|
|
||||||
// Each position is in the range [0,177), and are used on both the x and y axes.
|
|
||||||
// This could be implemented as lookup table of 40 variable-length lists of unsigned bytes.
|
|
||||||
private: std::vector<int> getAlignmentPatternPositions() const; |
|
||||||
|
|
||||||
|
|
||||||
// Returns the number of data bits that can be stored in a QR Code of the given version number, after
|
|
||||||
// all function modules are excluded. This includes remainder bits, so it might not be a multiple of 8.
|
|
||||||
// The result is in the range [208, 29648]. This could be implemented as a 40-entry lookup table.
|
|
||||||
private: static int getNumRawDataModules(int ver); |
|
||||||
|
|
||||||
|
|
||||||
// Returns the number of 8-bit data (i.e. not error correction) codewords contained in any
|
|
||||||
// QR Code of the given version number and error correction level, with remainder bits discarded.
|
|
||||||
// This stateless pure function could be implemented as a (40*4)-cell lookup table.
|
|
||||||
private: static int getNumDataCodewords(int ver, Ecc ecl); |
|
||||||
|
|
||||||
|
|
||||||
// Returns a Reed-Solomon ECC generator polynomial for the given degree. This could be
|
|
||||||
// implemented as a lookup table over all possible parameter values, instead of as an algorithm.
|
|
||||||
private: static std::vector<std::uint8_t> reedSolomonComputeDivisor(int degree); |
|
||||||
|
|
||||||
|
|
||||||
// Returns the Reed-Solomon error correction codeword for the given data and divisor polynomials.
|
|
||||||
private: static std::vector<std::uint8_t> reedSolomonComputeRemainder(const std::vector<std::uint8_t> &data, const std::vector<std::uint8_t> &divisor); |
|
||||||
|
|
||||||
|
|
||||||
// Returns the product of the two given field elements modulo GF(2^8/0x11D).
|
|
||||||
// All inputs are valid. This could be implemented as a 256*256 lookup table.
|
|
||||||
private: static std::uint8_t reedSolomonMultiply(std::uint8_t x, std::uint8_t y); |
|
||||||
|
|
||||||
|
|
||||||
// Can only be called immediately after a white run is added, and
|
|
||||||
// returns either 0, 1, or 2. A helper function for getPenaltyScore().
|
|
||||||
private: int finderPenaltyCountPatterns(const std::array<int,7> &runHistory) const; |
|
||||||
|
|
||||||
|
|
||||||
// Must be called at the end of a line (row or column) of modules. A helper function for getPenaltyScore().
|
|
||||||
private: int finderPenaltyTerminateAndCount(bool currentRunColor, int currentRunLength, std::array<int,7> &runHistory) const; |
|
||||||
|
|
||||||
|
|
||||||
// Pushes the given value to the front and drops the last value. A helper function for getPenaltyScore().
|
|
||||||
private: void finderPenaltyAddHistory(int currentRunLength, std::array<int,7> &runHistory) const; |
|
||||||
|
|
||||||
|
|
||||||
// Returns true iff the i'th bit of x is set to 1.
|
|
||||||
private: static bool getBit(long x, int i); |
|
||||||
|
|
||||||
|
|
||||||
/*---- Constants and tables ----*/ |
|
||||||
|
|
||||||
// The minimum version number supported in the QR Code Model 2 standard.
|
|
||||||
public: static constexpr int MIN_VERSION = 1; |
|
||||||
|
|
||||||
// The maximum version number supported in the QR Code Model 2 standard.
|
|
||||||
public: static constexpr int MAX_VERSION = 40; |
|
||||||
|
|
||||||
|
|
||||||
// For use in getPenaltyScore(), when evaluating which mask is best.
|
|
||||||
private: static const int PENALTY_N1; |
|
||||||
private: static const int PENALTY_N2; |
|
||||||
private: static const int PENALTY_N3; |
|
||||||
private: static const int PENALTY_N4; |
|
||||||
|
|
||||||
|
|
||||||
private: static const std::int8_t ECC_CODEWORDS_PER_BLOCK[4][41]; |
|
||||||
private: static const std::int8_t NUM_ERROR_CORRECTION_BLOCKS[4][41]; |
|
||||||
|
|
||||||
}; |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Public exception class ----*/ |
|
||||||
|
|
||||||
/*
|
|
||||||
* Thrown when the supplied data does not fit any QR Code version. Ways to handle this exception include: |
|
||||||
* - Decrease the error correction level if it was greater than Ecc::LOW. |
|
||||||
* - If the encodeSegments() function was called with a maxVersion argument, then increase |
|
||||||
* it if it was less than QrCode::MAX_VERSION. (This advice does not apply to the other |
|
||||||
* factory functions because they search all versions up to QrCode::MAX_VERSION.) |
|
||||||
* - Split the text data into better or optimal segments in order to reduce the number of bits required. |
|
||||||
* - Change the text or binary data to be shorter. |
|
||||||
* - Change the text to fit the character set of a particular segment mode (e.g. alphanumeric). |
|
||||||
* - Propagate the error upward to the caller/user. |
|
||||||
*/ |
|
||||||
class data_too_long : public std::length_error { |
|
||||||
|
|
||||||
public: explicit data_too_long(const std::string &msg); |
|
||||||
|
|
||||||
}; |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*
|
|
||||||
* An appendable sequence of bits (0s and 1s). Mainly used by QrSegment. |
|
||||||
*/ |
|
||||||
class BitBuffer final : public std::vector<bool> { |
|
||||||
|
|
||||||
/*---- Constructor ----*/ |
|
||||||
|
|
||||||
// Creates an empty bit buffer (length 0).
|
|
||||||
public: BitBuffer(); |
|
||||||
|
|
||||||
|
|
||||||
|
|
||||||
/*---- Method ----*/ |
|
||||||
|
|
||||||
// Appends the given number of low-order bits of the given value
|
|
||||||
// to this buffer. Requires 0 <= len <= 31 and val < 2^len.
|
|
||||||
public: void appendBits(std::uint32_t val, int len); |
|
||||||
|
|
||||||
}; |
|
||||||
|
|
||||||
} |
|
||||||
Loading…
Reference in new issue