更新

TongjiUniApp/node_modules/qrcode-reader/src/datablock.js

@@ -0,0 +1,95 @@
+/*
+  Ported to JavaScript by Lazar Laszlo 2011
+
+  lazarsoft@gmail.com, www.lazarsoft.info
+
+*/
+
+/*
+*
+* 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.
+*/
+
+
+export default function DataBlock(numDataCodewords,  codewords) {
+  this.numDataCodewords = numDataCodewords;
+  this.codewords = codewords;
+}
+
+DataBlock.getDataBlocks = function(rawCodewords,  version,  ecLevel) {
+
+  if (rawCodewords.length != version.totalCodewords) {
+    throw "ArgumentException";
+  }
+
+  // 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();
+  for (var i = 0; i < ecBlockArray.length; i++) {
+    totalBlocks += ecBlockArray[i].count;
+  }
+
+  // Now establish DataBlocks of the appropriate size and number of data codewords
+  var result = new Array(totalBlocks);
+  var numResultBlocks = 0;
+  for (var j = 0; j < ecBlockArray.length; j++) {
+    var ecBlock = ecBlockArray[j];
+    for (var i = 0; i < ecBlock.count; i++) {
+      var numDataCodewords = ecBlock.dataCodewords;
+      var numBlockCodewords = ecBlocks.ecCodewordsPerBlock + numDataCodewords;
+      result[numResultBlocks++] = new DataBlock(numDataCodewords, new Array(numBlockCodewords));
+    }
+  }
+
+  // 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;
+  while (longerBlocksStartAt >= 0) {
+    var numCodewords = result[longerBlocksStartAt].codewords.length;
+    if (numCodewords == shorterBlocksTotalCodewords) {
+      break;
+    }
+    longerBlocksStartAt--;
+  }
+  longerBlocksStartAt++;
+
+  var shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ecCodewordsPerBlock;
+  // 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;
+};