274 lines
8.0 KiB
JavaScript
274 lines
8.0 KiB
JavaScript
/*
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Ported to JavaScript by Lazar Laszlo 2011
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lazarsoft@gmail.com, www.lazarsoft.info
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*/
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/*
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*
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* Copyright 2007 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {qrcode} from './qrcode';
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export default function QRCodeDataBlockReader(blocks, version, numErrorCorrectionCode) {
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this.blockPointer = 0;
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this.bitPointer = 7;
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this.dataLength = 0;
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this.blocks = blocks;
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this.numErrorCorrectionCode = numErrorCorrectionCode;
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if (version <= 9)
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this.dataLengthMode = 0;
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else if (version >= 10 && version <= 26)
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this.dataLengthMode = 1;
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else if (version >= 27 && version <= 40)
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this.dataLengthMode = 2;
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}
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QRCodeDataBlockReader.prototype.getNextBits = function(numBits) {
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var bits = 0;
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if (numBits < this.bitPointer + 1) {
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// next word fits into current data block
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var mask = 0;
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for (var i = 0; i < numBits; i++) {
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mask += (1 << i);
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}
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mask <<= (this.bitPointer - numBits + 1);
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bits = (this.blocks[this.blockPointer] & mask) >> (this.bitPointer - numBits + 1);
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this.bitPointer -= numBits;
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return bits;
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} else if (numBits < this.bitPointer + 1 + 8) {
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// next word crosses 2 data blocks
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var mask1 = 0;
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for (var i = 0; i < this.bitPointer + 1; i++) {
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mask1 += (1 << i);
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}
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bits = (this.blocks[this.blockPointer] & mask1) << (numBits - (this.bitPointer + 1));
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this.blockPointer++;
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bits += ((this.blocks[this.blockPointer]) >> (8 - (numBits - (this.bitPointer + 1))));
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this.bitPointer = this.bitPointer - numBits % 8;
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if (this.bitPointer < 0) {
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this.bitPointer = 8 + this.bitPointer;
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}
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return bits;
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} else if (numBits < this.bitPointer + 1 + 16) {
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// next word crosses 3 data blocks
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var mask1 = 0; // mask of first block
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var mask3 = 0; // mask of 3rd block
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//bitPointer + 1 : number of bits of the 1st block
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//8 : number of the 2nd block (note that use already 8bits because next word uses 3 data blocks)
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//numBits - (bitPointer + 1 + 8) : number of bits of the 3rd block
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for (var i = 0; i < this.bitPointer + 1; i++) {
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mask1 += (1 << i);
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}
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var bitsFirstBlock = (this.blocks[this.blockPointer] & mask1) << (numBits - (this.bitPointer + 1));
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this.blockPointer++;
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var bitsSecondBlock = this.blocks[this.blockPointer] << (numBits - (this.bitPointer + 1 + 8));
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this.blockPointer++;
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for (var i = 0; i < numBits - (this.bitPointer + 1 + 8); i++) {
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mask3 += (1 << i);
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}
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mask3 <<= 8 - (numBits - (this.bitPointer + 1 + 8));
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var bitsThirdBlock = (this.blocks[this.blockPointer] & mask3) >> (8 - (numBits - (this.bitPointer + 1 + 8)));
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bits = bitsFirstBlock + bitsSecondBlock + bitsThirdBlock;
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this.bitPointer = this.bitPointer - (numBits - 8) % 8;
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if (this.bitPointer < 0) {
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this.bitPointer = 8 + this.bitPointer;
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}
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return bits;
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} else {
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return 0;
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}
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};
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QRCodeDataBlockReader.prototype.NextMode = function() {
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if ((this.blockPointer > this.blocks.length - this.numErrorCorrectionCode - 2))
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return 0;
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else
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return this.getNextBits(4);
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};
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QRCodeDataBlockReader.prototype.getDataLength = function(modeIndicator) {
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var index = 0;
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while (true) {
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if ((modeIndicator >> index) == 1)
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break;
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index++;
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}
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return this.getNextBits(qrcode.sizeOfDataLengthInfo[this.dataLengthMode][index]);
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};
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QRCodeDataBlockReader.prototype.getRomanAndFigureString = function(dataLength) {
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var length = dataLength;
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var intData = 0;
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var strData = "";
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var tableRomanAndFigure = ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', ' ', '$', '%', '*', '+', '-', '.', '/', ':'];
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do {
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if (length > 1) {
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intData = this.getNextBits(11);
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var firstLetter = Math.floor(intData / 45);
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var secondLetter = intData % 45;
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strData += tableRomanAndFigure[firstLetter];
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strData += tableRomanAndFigure[secondLetter];
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length -= 2;
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} else if (length == 1) {
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intData = this.getNextBits(6);
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strData += tableRomanAndFigure[intData];
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length -= 1;
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}
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}
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while (length > 0);
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return strData;
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};
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QRCodeDataBlockReader.prototype.getFigureString = function(dataLength) {
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var length = dataLength;
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var intData = 0;
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var strData = "";
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do {
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if (length >= 3) {
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intData = this.getNextBits(10);
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if (intData < 100)
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strData += "0";
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if (intData < 10)
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strData += "0";
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length -= 3;
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} else if (length == 2) {
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intData = this.getNextBits(7);
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if (intData < 10)
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strData += "0";
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length -= 2;
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} else if (length == 1) {
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intData = this.getNextBits(4);
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length -= 1;
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}
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strData += intData;
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}
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while (length > 0);
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return strData;
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};
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QRCodeDataBlockReader.prototype.get8bitByteArray = function(dataLength) {
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var length = dataLength;
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var intData = 0;
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var output = [];
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do {
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intData = this.getNextBits(8);
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output.push(intData);
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length--;
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}
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while (length > 0);
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return output;
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};
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QRCodeDataBlockReader.prototype.getKanjiString = function(dataLength) {
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var length = dataLength;
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var intData = 0;
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var unicodeString = "";
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do {
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intData = this.getNextBits(13);
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var lowerByte = intData % 0xC0;
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var higherByte = intData / 0xC0;
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var tempWord = (higherByte << 8) + lowerByte;
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var shiftjisWord = 0;
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if (tempWord + 0x8140 <= 0x9FFC) {
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// between 8140 - 9FFC on Shift_JIS character set
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shiftjisWord = tempWord + 0x8140;
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} else {
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// between E040 - EBBF on Shift_JIS character set
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shiftjisWord = tempWord + 0xC140;
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}
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unicodeString += String.fromCharCode(shiftjisWord);
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length--;
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}
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while (length > 0);
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return unicodeString;
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};
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Object.defineProperty(QRCodeDataBlockReader.prototype, "DataByte", {
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get: function() {
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var output = [];
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var MODE_NUMBER = 1;
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var MODE_ROMAN_AND_NUMBER = 2;
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var MODE_8BIT_BYTE = 4;
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var MODE_KANJI = 8;
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do {
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var mode = this.NextMode();
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if (mode == 0) {
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if (output.length > 0)
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break;
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else
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throw "Empty data block";
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}
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//if (mode != 1 && mode != 2 && mode != 4 && mode != 8)
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//}
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if (mode != MODE_NUMBER && mode != MODE_ROMAN_AND_NUMBER && mode != MODE_8BIT_BYTE && mode != MODE_KANJI && mode != 7) {
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/* canvas.println("Invalid mode: " + mode);
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mode = guessMode(mode);
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canvas.println("Guessed mode: " + mode); */
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throw "Invalid mode: " + mode + " in (block:" + this.blockPointer + " bit:" + this.bitPointer + ")";
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}
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var dataLength = this.getDataLength(mode);
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if (dataLength < 1)
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throw "Invalid data length: " + dataLength;
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switch (mode) {
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case MODE_NUMBER:
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var temp_str = this.getFigureString(dataLength);
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var ta = new Array(temp_str.length);
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for (var j = 0; j < temp_str.length; j++)
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ta[j] = temp_str.charCodeAt(j);
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output.push(ta);
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break;
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case MODE_ROMAN_AND_NUMBER:
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var temp_str = this.getRomanAndFigureString(dataLength);
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var ta = new Array(temp_str.length);
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for (var j = 0; j < temp_str.length; j++)
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ta[j] = temp_str.charCodeAt(j);
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output.push(ta);
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break;
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case MODE_8BIT_BYTE:
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var temp_sbyteArray3 = this.get8bitByteArray(dataLength);
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output.push(temp_sbyteArray3);
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break;
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case MODE_KANJI:
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var temp_str = this.getKanjiString(dataLength);
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output.push(temp_str);
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break;
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}
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//
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}
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while (true);
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return output;
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}
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});
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