Merge pull request #192

96c7dde Add QR code display on the receive page (moneromooo.monero)

1 files changed, 314 insertions, 0 deletions

diff --git a/src/QR-Code-generator/QrCode.hpp b/src/QR-Code-generator/QrCode.hpp
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+/* 
+ * QR Code generator library (C++)
+ * 
+ * Copyright (c) 2016 Project Nayuki
+ * https://www.nayuki.io/page/qr-code-generator-library
+ * 
+ * (MIT License)
+ * 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 <cstdint>
+#include <string>
+#include <vector>
+#include "QrSegment.hpp"
+
+
+namespace qrcodegen {
+
+/* 
+ * Represents an immutable square grid of black and white cells for a QR Code symbol, and
+ * provides static functions to create a QR Code from user-supplied textual or binary data.
+ * This class covers the QR Code model 2 specification, supporting all versions (sizes)
+ * from 1 to 40, all 4 error correction levels, and only 3 character encoding modes.
+ */
+class QrCode final {
+	
+	/*---- Public helper enumeration ----*/
+public:
+	
+	/* 
+	 * Represents the error correction level used in a QR Code symbol.
+	 */
+	class Ecc final {
+		// Constants declared in ascending order of error protection.
+	public:
+		const static Ecc LOW, MEDIUM, QUARTILE, HIGH;
+		
+		// Fields.
+	public:
+		const int ordinal;  // (Public) In the range 0 to 3 (unsigned 2-bit integer).
+		const int formatBits;  // (Package-private) In the range 0 to 3 (unsigned 2-bit integer).
+		
+		// Constructor.
+	private:
+		Ecc(int ord, int fb);
+	};
+	
+	
+	
+	/*---- Public static factory functions ----*/
+public:
+	
+	/* 
+	 * Returns a QR Code symbol 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 738 or fewer Unicode
+	 * code points (not UTF-16 code units). 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.
+	 */
+	static QrCode encodeText(const char *text, const Ecc &ecl);
+	
+	
+	/* 
+	 * Returns a QR Code symbol representing the given binary data string 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.
+	 */
+	static QrCode encodeBinary(const std::vector<uint8_t> &data, const Ecc &ecl);
+	
+	
+	/* 
+	 * Returns a QR Code symbol representing the specified data segments with the specified encoding parameters.
+	 * The smallest possible QR Code version within the specified range is automatically chosen for the output.
+	 * This function allows the user to create a custom sequence of segments that switches
+	 * between modes (such as alphanumeric and binary) to encode text more efficiently.
+	 * This function is considered to be lower level than simply encoding text or binary data.
+	 */
+	static QrCode encodeSegments(const std::vector<QrSegment> &segs, const Ecc &ecl,
+		int minVersion=1, int maxVersion=40, int mask=-1, bool boostEcl=true);  // All optional parameters
+	
+	
+	
+	/*---- Instance fields ----*/
+	
+	// Public immutable scalar parameters
+public:
+	
+	/* This QR Code symbol's version number, which is always between 1 and 40 (inclusive). */
+	const int version;
+	
+	/* The width and height of this QR Code symbol, measured in modules.
+	 * Always equal to version &times; 4 + 17, in the range 21 to 177. */
+	const int size;
+	
+	/* The error correction level used in this QR Code symbol. */
+	const Ecc &errorCorrectionLevel;
+	
+	/* The mask pattern used in this QR Code symbol, in the range 0 to 7 (i.e. unsigned 3-bit integer).
+	 * Note that even if a constructor was called with automatic masking requested
+	 * (mask = -1), the resulting object will still have a mask value between 0 and 7. */
+private:
+	int mask;
+	
+	// Private grids of modules/pixels (conceptually immutable)
+private:
+	std::vector<std::vector<bool>> modules;     // The modules of this QR Code symbol (false = white, true = black)
+	std::vector<std::vector<bool>> isFunction;  // Indicates function modules that are not subjected to masking
+	
+	
+	
+	/*---- Constructors ----*/
+public:
+	
+	/* 
+	 * Creates a new QR Code symbol with the given version number, error correction level, binary data array,
+	 * and mask number. This is a cumbersome low-level constructor that should not be invoked directly by the user.
+	 * To go one level up, see the encodeSegments() function.
+	 */
+	QrCode(int ver, const Ecc &ecl, const std::vector<uint8_t> &dataCodewords, int mask);
+	
+	
+	/* 
+	 * Creates a new QR Code symbol based on the given existing object, but with a potentially
+	 * different mask pattern. The version, error correction level, codewords, etc. of the newly
+	 * created object are all identical to the argument object; only the mask may differ.
+	 */
+	QrCode(const QrCode &qr, int mask);
+	
+	
+	
+	/*---- Public instance methods ----*/
+public:
+	
+	int getMask() const;
+	
+	
+	/* 
+	 * Returns the color of the module (pixel) at the given coordinates, which is either 0 for white or 1 for black. The top
+	 * left corner has the coordinates (x=0, y=0). If the given coordinates are out of bounds, then 0 (white) is returned.
+	 */
+	int getModule(int x, int y) const;
+	
+	
+	/* 
+	 * Based on the given number of border modules to add as padding, this returns a
+	 * string whose contents represents an SVG XML file that depicts this QR Code symbol.
+	 * Note that Unix newlines (\n) are always used, regardless of the platform.
+	 */
+	std::string toSvgString(int border) const;
+	
+	
+	
+	/*---- Private helper methods for constructor: Drawing 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.
+	void drawFormatBits(int mask);
+	
+	
+	// Draws two copies of the version bits (with its own error correction code),
+	// based on this object's version field (which only has an effect for 7 <= version <= 40).
+	void drawVersion();
+	
+	
+	// Draws a 9*9 finder pattern including the border separator, with the center module at (x, y).
+	void drawFinderPattern(int x, int y);
+	
+	
+	// Draws a 5*5 alignment pattern, with the center module at (x, y).
+	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 range.
+	void setFunctionModule(int x, int y, bool isBlack);
+	
+	
+	/*---- Private helper methods for constructor: Codewords and masking ----*/
+private:
+	
+	// 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.
+	std::vector<uint8_t> appendErrorCorrection(const std::vector<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 symbol. Function modules need to be marked off before this is called.
+	void drawCodewords(const std::vector<uint8_t> &data);
+	
+	
+	// XORs the data modules in this QR Code with the given mask pattern. Due to XOR's mathematical
+	// properties, calling applyMask(m) twice with the same value is equivalent to no change at all.
+	// This means it is possible to apply a mask, undo it, and try another mask. Note that a final
+	// well-formed QR Code symbol needs exactly one mask applied (not zero, not two, etc.).
+	void applyMask(int mask);
+	
+	
+	// A messy helper function for the constructors. This QR Code must be in an unmasked state when this
+	// method is called. The given argument is the requested mask, which is -1 for auto or 0 to 7 for fixed.
+	// This method applies and returns the actual mask chosen, from 0 to 7.
+	int handleConstructorMasking(int mask);
+	
+	
+	// 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.
+	int getPenaltyScore() const;
+	
+	
+	
+	/*---- Private static helper functions ----*/
+private:
+	
+	// Returns a set of positions of the alignment patterns in ascending order. These positions are
+	// used on both the x and y axes. Each value in the resulting array is in the range [0, 177).
+	// This stateless pure function could be implemented as table of 40 variable-length lists of unsigned bytes.
+	static std::vector<int> getAlignmentPatternPositions(int ver);
+	
+	
+	// Returns the number of raw data modules (bits) available at the given version number.
+	// These data modules are used for both user data codewords and error correction codewords.
+	// This stateless pure function could be implemented as a 40-entry lookup table.
+	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.
+	static int getNumDataCodewords(int ver, const Ecc &ecl);
+	
+	
+	/*---- Private tables of constants ----*/
+private:
+	
+	// For use in getPenaltyScore(), when evaluating which mask is best.
+	static const int PENALTY_N1;
+	static const int PENALTY_N2;
+	static const int PENALTY_N3;
+	static const int PENALTY_N4;
+	
+	static const int16_t NUM_ERROR_CORRECTION_CODEWORDS[4][41];
+	static const int8_t NUM_ERROR_CORRECTION_BLOCKS[4][41];
+	
+	
+	
+	/*---- Private helper class ----*/
+private:
+	
+	/* 
+	 * Computes the Reed-Solomon error correction codewords for a sequence of data codewords
+	 * at a given degree. Objects are immutable, and the state only depends on the degree.
+	 * This class exists because the divisor polynomial does not need to be recalculated for every input.
+	 */
+	class ReedSolomonGenerator final {
+		
+		/*-- Immutable field --*/
+	private:
+		
+		// Coefficients of the divisor polynomial, 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}.
+		std::vector<uint8_t> coefficients;
+		
+		
+		/*-- Constructor --*/
+	public:
+		
+		/* 
+		 * Creates a Reed-Solomon ECC generator for the given degree. This could be implemented
+		 * as a lookup table over all possible parameter values, instead of as an algorithm.
+		 */
+		ReedSolomonGenerator(int degree);
+		
+		
+		/*-- Method --*/
+	public:
+		
+		/* 
+		 * Computes and returns the Reed-Solomon error correction codewords for the given sequence of data codewords.
+		 * The returned object is always a new byte array. This method does not alter this object's state (because it is immutable).
+		 */
+		std::vector<uint8_t> getRemainder(const std::vector<uint8_t> &data) const;
+		
+		
+		/*-- Static function --*/
+	private:
+		
+		// Returns the product of the two given field elements modulo GF(2^8/0x11D). The arguments and result
+		// are unsigned 8-bit integers. This could be implemented as a lookup table of 256*256 entries of uint8.
+		static uint8_t multiply(uint8_t x, uint8_t y);
+		
+	};
+	
+};
+
+}