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@zxing/library

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TypeScript port of ZXing multi-format 1D/2D barcode image processing library.

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/* * Copyright 2007 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ var __values = (this && this.__values) || function(o) { var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0; if (m) return m.call(o); if (o && typeof o.length === "number") return { next: function () { if (o && i >= o.length) o = void 0; return { value: o && o[i++], done: !o }; } }; throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined."); }; import IllegalArgumentException from '../../IllegalArgumentException'; /** * <p>Encapsulates a block of data within a QR Code. QR Codes may split their data into * multiple blocks, each of which is a unit of data and error-correction codewords. Each * is represented by an instance of this class.</p> * * @author Sean Owen */ var DataBlock = /** @class */ (function () { function DataBlock(numDataCodewords /*int*/, codewords) { this.numDataCodewords = numDataCodewords; this.codewords = codewords; } /** * <p>When QR Codes use multiple data blocks, they are actually interleaved. * That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This * method will separate the data into original blocks.</p> * * @param rawCodewords bytes as read directly from the QR Code * @param version version of the QR Code * @param ecLevel error-correction level of the QR Code * @return DataBlocks containing original bytes, "de-interleaved" from representation in the * QR Code */ DataBlock.getDataBlocks = function (rawCodewords, version, ecLevel) { var e_1, _a, e_2, _b; if (rawCodewords.length !== version.getTotalCodewords()) { throw new IllegalArgumentException(); } // Figure out the number and size of data blocks used by this version and // error correction level var ecBlocks = version.getECBlocksForLevel(ecLevel); // First count the total number of data blocks var totalBlocks = 0; var ecBlockArray = ecBlocks.getECBlocks(); try { for (var ecBlockArray_1 = __values(ecBlockArray), ecBlockArray_1_1 = ecBlockArray_1.next(); !ecBlockArray_1_1.done; ecBlockArray_1_1 = ecBlockArray_1.next()) { var ecBlock = ecBlockArray_1_1.value; totalBlocks += ecBlock.getCount(); } } catch (e_1_1) { e_1 = { error: e_1_1 }; } finally { try { if (ecBlockArray_1_1 && !ecBlockArray_1_1.done && (_a = ecBlockArray_1.return)) _a.call(ecBlockArray_1); } finally { if (e_1) throw e_1.error; } } // Now establish DataBlocks of the appropriate size and number of data codewords var result = new Array(totalBlocks); var numResultBlocks = 0; try { for (var ecBlockArray_2 = __values(ecBlockArray), ecBlockArray_2_1 = ecBlockArray_2.next(); !ecBlockArray_2_1.done; ecBlockArray_2_1 = ecBlockArray_2.next()) { var ecBlock = ecBlockArray_2_1.value; for (var i = 0; i < ecBlock.getCount(); i++) { var numDataCodewords = ecBlock.getDataCodewords(); var numBlockCodewords = ecBlocks.getECCodewordsPerBlock() + numDataCodewords; result[numResultBlocks++] = new DataBlock(numDataCodewords, new Uint8Array(numBlockCodewords)); } } } catch (e_2_1) { e_2 = { error: e_2_1 }; } finally { try { if (ecBlockArray_2_1 && !ecBlockArray_2_1.done && (_b = ecBlockArray_2.return)) _b.call(ecBlockArray_2); } finally { if (e_2) throw e_2.error; } } // All blocks have the same amount of data, except that the last n // (where n may be 0) have 1 more byte. Figure out where these start. var shorterBlocksTotalCodewords = result[0].codewords.length; var longerBlocksStartAt = result.length - 1; // TYPESCRIPTPORT: check length is correct here while (longerBlocksStartAt >= 0) { var numCodewords = result[longerBlocksStartAt].codewords.length; if (numCodewords === shorterBlocksTotalCodewords) { break; } longerBlocksStartAt--; } longerBlocksStartAt++; var shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.getECCodewordsPerBlock(); // The last elements of result may be 1 element longer // first fill out as many elements as all of them have var rawCodewordsOffset = 0; for (var i = 0; i < shorterBlocksNumDataCodewords; i++) { for (var j = 0; j < numResultBlocks; j++) { result[j].codewords[i] = rawCodewords[rawCodewordsOffset++]; } } // Fill out the last data block in the longer ones for (var j = longerBlocksStartAt; j < numResultBlocks; j++) { result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++]; } // Now add in error correction blocks var max = result[0].codewords.length; for (var i = shorterBlocksNumDataCodewords; i < max; i++) { for (var j = 0; j < numResultBlocks; j++) { var iOffset = j < longerBlocksStartAt ? i : i + 1; result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++]; } } return result; }; DataBlock.prototype.getNumDataCodewords = function () { return this.numDataCodewords; }; DataBlock.prototype.getCodewords = function () { return this.codewords; }; return DataBlock; }()); export default DataBlock;