QR-Code-generator/java/io/nayuki/qrcodegen/QrSegmentAdvanced.java

/* 
 * QR Code generator library - Optional advanced logic (Java)
 * 
 * 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.
 */

package io.nayuki.qrcodegen;

import static io.nayuki.qrcodegen.QrSegment.Mode.ALPHANUMERIC;
import static io.nayuki.qrcodegen.QrSegment.Mode.BYTE;
import static io.nayuki.qrcodegen.QrSegment.Mode.NUMERIC;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;
import java.util.List;
import java.util.Objects;


public final class QrSegmentAdvanced {
	
	/*---- Optimal list of segments encoder ----*/
	
	/**
	 * Returns a new mutable list of zero or more segments to represent the specified Unicode text string.
	 * The resulting list optimally minimizes the total encoded bit length, subjected to the constraints given
	 * by the specified {error correction level, minimum version number, maximum version number}, plus the additional
	 * constraint that the segment modes {NUMERIC, ALPHANUMERIC, BYTE} can be used but KANJI cannot be used.
	 * <p>This function can be viewed as a significantly more sophisticated and slower replacement
	 * for {@link QrSegment#makeSegments(String)}, but requiring more input parameters in a way
	 * that overlaps with {@link QrCode#encodeSegments(List,QrCode.Ecc,int,int,int,boolean)}.</p>
	 * @param text the text to be encoded, which can be any Unicode string
	 * @param ecl the error correction level to use
	 * @param minVersion the minimum allowed version of the QR symbol (at least 1)
	 * @param maxVersion the maximum allowed version of the QR symbol (at most 40)
	 * @return a list of segments containing the text, minimizing the bit length with respect to the constraints
	 * @throws NullPointerException if the data or error correction level is {@code null}
	 * @throws IllegalArgumentException if 1 &le; minVersion &le; maxVersion &le; 40 is violated,
	 * or if the data is too long to fit in a QR Code at maxVersion at the ECL
	 */
	public static List<QrSegment> makeSegmentsOptimally(String text, QrCode.Ecc ecl, int minVersion, int maxVersion) {
		// Check arguments
		Objects.requireNonNull(text);
		Objects.requireNonNull(ecl);
		if (!(1 <= minVersion && minVersion <= maxVersion && maxVersion <= 40))
			throw new IllegalArgumentException("Invalid value");
		
		// Iterate through version numbers, and make tentative segments
		List<QrSegment> segs = null;
		for (int version = minVersion; version <= maxVersion; version++) {
			if (version == minVersion || version == 10 || version == 27)
				segs = makeSegmentsOptimally(text, version);
			
			// Check if the segments fit
			int dataCapacityBits = QrCode.getNumDataCodewords(version, ecl) * 8;
			int dataUsedBits = QrSegment.getTotalBits(segs, version);
			if (dataUsedBits != -1 && dataUsedBits <= dataCapacityBits)
				return segs;
		}
		throw new IllegalArgumentException("Data too long");
	}
	
	
	// Returns a list of segments that is optimal for the given text at the given version number.
	private static List<QrSegment> makeSegmentsOptimally(String text, int version) {
		byte[] data = text.getBytes(StandardCharsets.UTF_8);
		int[][] bitCosts = computeBitCosts(data, version);
		QrSegment.Mode[] charModes = computeCharacterModes(data, version, bitCosts);
		return splitIntoSegments(data, charModes);
	}
	
	
	private static int[][] computeBitCosts(byte[] data, int version) {
		// Segment header sizes, measured in 1/6 bits
		int bytesCost   = (4 + BYTE        .numCharCountBits(version)) * 6;
		int alphnumCost = (4 + ALPHANUMERIC.numCharCountBits(version)) * 6;
		int numberCost  = (4 + NUMERIC     .numCharCountBits(version)) * 6;
		
		// result[mode][len] is the number of 1/6 bits to encode the first len characters of the text, ending in the mode
		int[][] result = new int[3][data.length + 1];
		Arrays.fill(result[1], Integer.MAX_VALUE / 2);
		Arrays.fill(result[2], Integer.MAX_VALUE / 2);
		result[0][0] = bytesCost;
		result[1][0] = alphnumCost;
		result[2][0] = numberCost;
		
		// Calculate the cost table using dynamic programming
		for (int i = 0; i < data.length; i++) {
			// Encode a character
			int j = i + 1;
			char c = (char)data[i];
			result[0][j] = result[0][i] + 48;  // 8 bits per byte
			if (isAlphanumeric(c))
				result[1][j] = result[1][i] + 33;  // 5.5 bits per alphanumeric char
			if (isNumeric(c))
				result[2][j] = result[2][i] + 20;  // 3.33 bits per digit
			
			// Switch modes, rounding up fractional bits
			result[0][j] = Math.min(roundUp6(Math.min(result[1][j], result[2][j])) + bytesCost  , result[0][j]);
			result[1][j] = Math.min(roundUp6(Math.min(result[2][j], result[0][j])) + alphnumCost, result[1][j]);
			result[2][j] = Math.min(roundUp6(Math.min(result[0][j], result[1][j])) + numberCost , result[2][j]);
		}
		return result;
	}
	
	
	private static QrSegment.Mode[] computeCharacterModes(byte[] data, int version, int[][] bitCosts) {
		// Segment header sizes, measured in 1/6 bits
		int bytesCost   = (4 + BYTE        .numCharCountBits(version)) * 6;
		int alphnumCost = (4 + ALPHANUMERIC.numCharCountBits(version)) * 6;
		int numberCost  = (4 + NUMERIC     .numCharCountBits(version)) * 6;
		
		// Infer the mode used for last character by taking the minimum
		QrSegment.Mode curMode;
		int end = bitCosts[0].length - 1;
		if (bitCosts[0][end] <= Math.min(bitCosts[1][end], bitCosts[2][end]))
			curMode = BYTE;
		else if (bitCosts[1][end] <= bitCosts[2][end])
			curMode = ALPHANUMERIC;
		else
			curMode = NUMERIC;
		
		// Work backwards to calculate optimal encoding mode for each character
		QrSegment.Mode[] result = new QrSegment.Mode[data.length];
		if (data.length == 0)
			return result;
		result[data.length - 1] = curMode;
		for (int i = data.length - 2; i >= 0; i--) {
			char c = (char)data[i];
			if (curMode == NUMERIC) {
				if (isNumeric(c))
					curMode = NUMERIC;
				else if (isAlphanumeric(c) && roundUp6(bitCosts[1][i] + 33) + numberCost == bitCosts[2][i + 1])
					curMode = ALPHANUMERIC;
				else
					curMode = BYTE;
			} else if (curMode == ALPHANUMERIC) {
				if (isNumeric(c) && roundUp6(bitCosts[2][i] + 20) + alphnumCost == bitCosts[1][i + 1])
					curMode = NUMERIC;
				else if (isAlphanumeric(c))
					curMode = ALPHANUMERIC;
				else
					curMode = BYTE;
			} else if (curMode == BYTE) {
				if (isNumeric(c) && roundUp6(bitCosts[2][i] + 20) + bytesCost == bitCosts[0][i + 1])
					curMode = NUMERIC;
				else if (isAlphanumeric(c) && roundUp6(bitCosts[1][i] + 33) + bytesCost == bitCosts[0][i + 1])
					curMode = ALPHANUMERIC;
				else
					curMode = BYTE;
			} else
				throw new AssertionError();
			result[i] = curMode;
		}
		return result;
	}
	
	
	private static List<QrSegment> splitIntoSegments(byte[] data, QrSegment.Mode[] charModes) {
		List<QrSegment> result = new ArrayList<>();
		if (data.length == 0)
			return result;
		
		// Accumulate run of modes
		QrSegment.Mode curMode = charModes[0];
		int start = 0;
		for (int i = 1; ; i++) {
			if (i >= data.length || charModes[i] != curMode) {
				if (curMode == BYTE)
					result.add(QrSegment.makeBytes(Arrays.copyOfRange(data, start, i)));
				else {
					String temp = new String(data, start, i - start, StandardCharsets.US_ASCII);
					if (curMode == NUMERIC)
						result.add(QrSegment.makeNumeric(temp));
					else if (curMode == ALPHANUMERIC)
						result.add(QrSegment.makeAlphanumeric(temp));
					else
						throw new AssertionError();
				}
				if (i >= data.length)
					return result;
				curMode = charModes[i];
				start = i;
			}
		}
	}
	
	
	private static boolean isAlphanumeric(char c) {
		return isNumeric(c) || 'A' <= c && c <= 'Z' || " $%*+./:-".indexOf(c) != -1;
	}
	
	private static boolean isNumeric(char c) {
		return '0' <= c && c <= '9';
	}
	
	
	private static int roundUp6(int x) {
		return (x + 5) / 6 * 6;
	}
	
	
	
	/*---- Kanji mode segment encoder ----*/
	
	/**
	 * Returns a segment representing the specified string encoded in kanji mode.
	 * <p>Note that broadly speaking, the set of encodable characters are {kanji used in Japan,
	 * hiragana, katakana, East Asian punctuation, full-width ASCII, Greek, Cyrillic}.<br/>
	 * Examples of non-encodable characters include {normal ASCII, half-width katakana, more extensive Chinese hanzi}.
	 * @param text the text to be encoded, which must fall in the kanji mode subset of characters
	 * @return a segment containing the data
	 * @throws NullPointerException if the string is {@code null}
	 * @throws IllegalArgumentException if the string contains non-kanji-mode characters
	 * @see #isEncodableAsKanji(String)
	 */
	public static QrSegment makeKanji(String text) {
		Objects.requireNonNull(text);
		BitBuffer bb = new BitBuffer();
		for (int i = 0; i < text.length(); i++) {
			int val = UNICODE_TO_QR_KANJI[text.charAt(i)];
			if (val == -1)
				throw new IllegalArgumentException("String contains non-kanji-mode characters");
			bb.appendBits(val, 13);
		}
		return new QrSegment(QrSegment.Mode.KANJI, text.length(), bb);
	}
	
	
	/**
	 * Tests whether the specified text string can be encoded as a segment in kanji mode.
	 * <p>Note that broadly speaking, the set of encodable characters are {kanji used in Japan,
	 * hiragana, katakana, East Asian punctuation, full-width ASCII, Greek, Cyrillic}.<br/>
	 * Examples of non-encodable characters include {normal ASCII, half-width katakana, more extensive Chinese hanzi}.
	 * @param text the string to test for encodability
	 * @return {@code true} if and only if the string can be encoded in kanji mode
	 * @throws NullPointerException if the string is {@code null}
	 * @see #makeKanji(String)
	 */
	public static boolean isEncodableAsKanji(String text) {
		Objects.requireNonNull(text);
		for (int i = 0; i < text.length(); i++) {
			if (UNICODE_TO_QR_KANJI[text.charAt(i)] == -1)
				return false;
		}
		return true;
	}
	
	
	// Data derived from ftp://ftp.unicode.org/Public/MAPPINGS/OBSOLETE/EASTASIA/JIS/SHIFTJIS.TXT
	private static final String PACKED_QR_KANJI_TO_UNICODE =
		"MAAwATAC/wz/DjD7/xr/G/8f/wEwmzCcALT/QACo/z7/4/8/MP0w/jCdMJ4wA07dMAUwBjAHMPwgFSAQ/w8AXDAcIBb/XCAmICUgGCAZIBwgHf8I/wkwFDAV/zv/Pf9b/10wCDAJMAowCzAMMA0wDjAPMBAwEf8LIhIAsQDX//8A9/8dImD/HP8eImYiZyIeIjQmQiZA" +
		"ALAgMiAzIQP/5f8EAKIAo/8F/wP/Bv8K/yAApyYGJgUlyyXPJc4lxyXGJaEloCWzJbIlvSW8IDswEiGSIZAhkSGTMBP/////////////////////////////IggiCyKGIocigiKDIioiKf////////////////////8iJyIoAKwh0iHUIgAiA///////////////////" +
		"//////////8iICKlIxIiAiIHImEiUiJqImsiGiI9Ih0iNSIrIiz//////////////////yErIDAmbyZtJmogICAhALb//////////yXv/////////////////////////////////////////////////xD/Ef8S/xP/FP8V/xb/F/8Y/xn///////////////////8h" +
		"/yL/I/8k/yX/Jv8n/yj/Kf8q/yv/LP8t/y7/L/8w/zH/Mv8z/zT/Nf82/zf/OP85/zr///////////////////9B/0L/Q/9E/0X/Rv9H/0j/Sf9K/0v/TP9N/07/T/9Q/1H/Uv9T/1T/Vf9W/1f/WP9Z/1r//////////zBBMEIwQzBEMEUwRjBHMEgwSTBKMEswTDBN" +
		"ME4wTzBQMFEwUjBTMFQwVTBWMFcwWDBZMFowWzBcMF0wXjBfMGAwYTBiMGMwZDBlMGYwZzBoMGkwajBrMGwwbTBuMG8wcDBxMHIwczB0MHUwdjB3MHgweTB6MHswfDB9MH4wfzCAMIEwgjCDMIQwhTCGMIcwiDCJMIowizCMMI0wjjCPMJAwkTCSMJP/////////////" +
		"////////////////////////MKEwojCjMKQwpTCmMKcwqDCpMKowqzCsMK0wrjCvMLAwsTCyMLMwtDC1MLYwtzC4MLkwujC7MLwwvTC+ML8wwDDBMMIwwzDEMMUwxjDHMMgwyTDKMMswzDDNMM4wzzDQMNEw0jDTMNQw1TDWMNcw2DDZMNow2zDcMN0w3jDf//8w4DDh" +
		"MOIw4zDkMOUw5jDnMOgw6TDqMOsw7DDtMO4w7zDwMPEw8jDzMPQw9TD2/////////////////////wORA5IDkwOUA5UDlgOXA5gDmQOaA5sDnAOdA54DnwOgA6EDowOkA6UDpgOnA6gDqf////////////////////8DsQOyA7MDtAO1A7YDtwO4A7kDugO7A7wDvQO+" +
		"A78DwAPBA8MDxAPFA8YDxwPIA8n/////////////////////////////////////////////////////////////////////////////////////////////////////////////BBAEEQQSBBMEFAQVBAEEFgQXBBgEGQQaBBsEHAQdBB4EHwQgBCEEIgQjBCQEJQQm" +
		"BCcEKAQpBCoEKwQsBC0ELgQv////////////////////////////////////////BDAEMQQyBDMENAQ1BFEENgQ3BDgEOQQ6BDsEPAQ9//8EPgQ/BEAEQQRCBEMERARFBEYERwRIBEkESgRLBEwETQROBE///////////////////////////////////yUAJQIlDCUQ" +
		"JRglFCUcJSwlJCU0JTwlASUDJQ8lEyUbJRclIyUzJSslOyVLJSAlLyUoJTclPyUdJTAlJSU4JUL/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"/////////////////////////////////////06cVRZaA5Y/VMBhG2MoWfaQIoR1gxx6UGCqY+FuJWXthGaCppv1aJNXJ2WhYnFbm1nQhnuY9H1ifb6bjmIWfJ+It1uJXrVjCWaXaEiVx5eNZ09O5U8KT01PnVBJVvJZN1nUWgFcCWDfYQ9hcGYTaQVwunVPdXB5+32t" +
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		"////////m0FmZmiwbXdwcHVMdoZ9dYKlh/mVi5aOjJ1R8VK+WRZUs1uzXRZhaGmCba94jYTLiFeKcpOnmrhtbJmohtlXo2f/hs6SDlKDVodUBF7TYuFkuWg8aDhru3NyeLp6a4maidKNa48DkO2Vo5aUl2lbZlyzaX2YTZhOY5t7IGor//9qf2i2nA1vX1JyVZ1gcGLs" +
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		"dZF5R3+ph/uKvItwY6yDypegVAlUA1WraFRqWIpweCdndZ7NU3RbooEahlCQBk4YTkVOx08RU8pUOFuuXxNgJWVR//9nPWxCbHJs43B4dAN6dnquewh9Gnz+fWZl53JbU7tcRV3oYtJi4GMZbiCGWooxjd2S+G8BeaabWk6oTqtOrE+bT6BQ0VFHevZRcVH2U1RTIVN/" +
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		"nVGdUJ1ZnXKdiZ2Hnaudb516nZqdpJ2pnbKdxJ3BnbuduJ26ncadz53Cndmd0534nead7Z3vnf2eGp4bnh6edZ55nn2egZ6InouejJ6SnpWekZ6dnqWeqZ64nqqerZdhnsyezp7PntCe1J7cnt6e3Z7gnuWe6J7v//+e9J72nvee+Z77nvye/Z8Hnwh2t58VnyGfLJ8+" +
		"n0qfUp9Un2OfX59gn2GfZp9nn2yfap93n3Kfdp+Vn5yfoFgvaceQWXRkUdxxmf//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////" +
		"/////////////////////////////////////////////w==";
	
	
	private static short[] UNICODE_TO_QR_KANJI = new short[1 << 16];
	
	static {  // Unpack the Shift JIS table into a more computation-friendly form
		Arrays.fill(UNICODE_TO_QR_KANJI, (short)-1);
		byte[] bytes = Base64.getDecoder().decode(PACKED_QR_KANJI_TO_UNICODE);
		for (int i = 0; i < bytes.length; i += 2) {
			char c = (char)(((bytes[i] & 0xFF) << 8) | (bytes[i + 1] & 0xFF));
			if (c == 0xFFFF)
				continue;
			assert UNICODE_TO_QR_KANJI[c] == -1;
			UNICODE_TO_QR_KANJI[c] = (short)(i / 2);
		}
	}
	
}