sports-miniapp/node_modules/qrcode-reader/src/datablock.js

/*
  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;
};