@zxing/library
Version:
TypeScript port of ZXing multi-format 1D/2D barcode image processing library.
136 lines (135 loc) • 6.52 kB
JavaScript
;
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.");
};
Object.defineProperty(exports, "__esModule", { value: true });
var IllegalArgumentException_1 = require("../../IllegalArgumentException");
/*
* Copyright 2008 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.
*/
/**
* <p>Encapsulates a block of data within a Data Matrix Code. Data Matrix 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 bbrown@google.com (Brian Brown)
*/
var DataBlock = /** @class */ (function () {
function DataBlock(numDataCodewords, codewords) {
this.numDataCodewords = numDataCodewords;
this.codewords = codewords;
}
/**
* <p>When Data Matrix Codes use multiple data blocks, they actually interleave the bytes of each of them.
* 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 Data Matrix Code
* @param version version of the Data Matrix Code
* @return DataBlocks containing original bytes, "de-interleaved" from representation in the
* Data Matrix Code
*/
DataBlock.getDataBlocks = function (rawCodewords, version) {
var e_1, _a, e_2, _b;
// Figure out the number and size of data blocks used by this version
var ecBlocks = version.getECBlocks();
// 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.getECCodewords() + 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 less byte. Figure out where these start.
// TODO(bbrown): There is only one case where there is a difference for Data Matrix for size 144
var longerBlocksTotalCodewords = result[0].codewords.length;
// int shorterBlocksTotalCodewords = longerBlocksTotalCodewords - 1;
var longerBlocksNumDataCodewords = longerBlocksTotalCodewords - ecBlocks.getECCodewords();
var shorterBlocksNumDataCodewords = longerBlocksNumDataCodewords - 1;
// The last elements of result may be 1 element shorter for 144 matrix
// first fill out as many elements as all of them have minus 1
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
var specialVersion = version.getVersionNumber() === 24;
var numLongerBlocks = specialVersion ? 8 : numResultBlocks;
for (var j = 0; j < numLongerBlocks; j++) {
result[j].codewords[longerBlocksNumDataCodewords - 1] = rawCodewords[rawCodewordsOffset++];
}
// Now add in error correction blocks
var max = result[0].codewords.length;
for (var i = longerBlocksNumDataCodewords; i < max; i++) {
for (var j = 0; j < numResultBlocks; j++) {
var jOffset = specialVersion ? (j + 8) % numResultBlocks : j;
var iOffset = specialVersion && jOffset > 7 ? i - 1 : i;
result[jOffset].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
}
}
if (rawCodewordsOffset !== rawCodewords.length) {
throw new IllegalArgumentException_1.default();
}
return result;
};
DataBlock.prototype.getNumDataCodewords = function () {
return this.numDataCodewords;
};
DataBlock.prototype.getCodewords = function () {
return this.codewords;
};
return DataBlock;
}());
exports.default = DataBlock;