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117 lines
3.4 KiB
117 lines
3.4 KiB
/*
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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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function DataBlock(numDataCodewords, codewords)
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{
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this.numDataCodewords = numDataCodewords;
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this.codewords = codewords;
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this.__defineGetter__("NumDataCodewords", function()
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{
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return this.numDataCodewords;
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});
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this.__defineGetter__("Codewords", function()
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{
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return this.codewords;
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});
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}
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DataBlock.getDataBlocks=function(rawCodewords, version, ecLevel)
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{
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if (rawCodewords.length != version.TotalCodewords)
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{
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throw "ArgumentException";
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}
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// Figure out the number and size of data blocks used by this version and
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// error correction level
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var ecBlocks = version.getECBlocksForLevel(ecLevel);
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// First count the total number of data blocks
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var totalBlocks = 0;
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var ecBlockArray = ecBlocks.getECBlocks();
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for (var i = 0; i < ecBlockArray.length; i++)
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{
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totalBlocks += ecBlockArray[i].Count;
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}
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// Now establish DataBlocks of the appropriate size and number of data codewords
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var result = new Array(totalBlocks);
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var numResultBlocks = 0;
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for (var j = 0; j < ecBlockArray.length; j++)
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{
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var ecBlock = ecBlockArray[j];
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for (var i = 0; i < ecBlock.Count; i++)
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{
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var numDataCodewords = ecBlock.DataCodewords;
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var numBlockCodewords = ecBlocks.ECCodewordsPerBlock + numDataCodewords;
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result[numResultBlocks++] = new DataBlock(numDataCodewords, new Array(numBlockCodewords));
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}
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}
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// All blocks have the same amount of data, except that the last n
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// (where n may be 0) have 1 more byte. Figure out where these start.
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var shorterBlocksTotalCodewords = result[0].codewords.length;
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var longerBlocksStartAt = result.length - 1;
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while (longerBlocksStartAt >= 0)
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{
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var numCodewords = result[longerBlocksStartAt].codewords.length;
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if (numCodewords == shorterBlocksTotalCodewords)
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{
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break;
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}
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longerBlocksStartAt--;
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}
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longerBlocksStartAt++;
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var shorterBlocksNumDataCodewords = shorterBlocksTotalCodewords - ecBlocks.ECCodewordsPerBlock;
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// The last elements of result may be 1 element longer;
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// first fill out as many elements as all of them have
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var rawCodewordsOffset = 0;
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for (var i = 0; i < shorterBlocksNumDataCodewords; i++)
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{
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for (var j = 0; j < numResultBlocks; j++)
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{
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result[j].codewords[i] = rawCodewords[rawCodewordsOffset++];
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}
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}
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// Fill out the last data block in the longer ones
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for (var j = longerBlocksStartAt; j < numResultBlocks; j++)
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{
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result[j].codewords[shorterBlocksNumDataCodewords] = rawCodewords[rawCodewordsOffset++];
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}
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// Now add in error correction blocks
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var max = result[0].codewords.length;
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for (var i = shorterBlocksNumDataCodewords; i < max; i++)
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{
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for (var j = 0; j < numResultBlocks; j++)
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{
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var iOffset = j < longerBlocksStartAt?i:i + 1;
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result[j].codewords[iOffset] = rawCodewords[rawCodewordsOffset++];
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}
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}
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return result;
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}
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