/*
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* Copyright 2012 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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#import "ZXByteArray.h"
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#import "ZXDataMatrixDataBlock.h"
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#import "ZXDataMatrixVersion.h"
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@implementation ZXDataMatrixDataBlock
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- (id)initWithNumDataCodewords:(int)numDataCodewords codewords:(ZXByteArray *)codewords {
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if (self = [super init]) {
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_numDataCodewords = numDataCodewords;
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_codewords = codewords;
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}
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return self;
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}
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+ (NSArray *)dataBlocks:(ZXByteArray *)rawCodewords version:(ZXDataMatrixVersion *)version {
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// Figure out the number and size of data blocks used by this version
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ZXDataMatrixECBlocks *ecBlocks = version.ecBlocks;
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// First count the total number of data blocks
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int totalBlocks = 0;
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NSArray *ecBlockArray = ecBlocks.ecBlocks;
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for (ZXDataMatrixECB *ecBlock in ecBlockArray) {
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totalBlocks += ecBlock.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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NSMutableArray *result = [NSMutableArray arrayWithCapacity:totalBlocks];
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for (ZXDataMatrixECB *ecBlock in ecBlockArray) {
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for (int i = 0; i < ecBlock.count; i++) {
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int numDataCodewords = ecBlock.dataCodewords;
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int numBlockCodewords = ecBlocks.ecCodewords + numDataCodewords;
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[result addObject:[[ZXDataMatrixDataBlock alloc] initWithNumDataCodewords:numDataCodewords codewords:[[ZXByteArray alloc] initWithLength: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 less byte. Figure out where these start.
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// TODO(bbrown): There is only one case where there is a difference for Data Matrix for size 144
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int longerBlocksTotalCodewords = [[(ZXDataMatrixDataBlock *)result[0] codewords] length];
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//int shorterBlocksTotalCodewords = longerBlocksTotalCodewords - 1;
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int longerBlocksNumDataCodewords = longerBlocksTotalCodewords - ecBlocks.ecCodewords;
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int shorterBlocksNumDataCodewords = longerBlocksNumDataCodewords - 1;
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// The last elements of result may be 1 element shorter for 144 matrix
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// first fill out as many elements as all of them have minus 1
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int rawCodewordsOffset = 0;
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for (int i = 0; i < shorterBlocksNumDataCodewords; i++) {
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for (ZXDataMatrixDataBlock *block in result) {
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block.codewords.array[i] = rawCodewords.array[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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BOOL specialVersion = version.versionNumber == 24;
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int numLongerBlocks = specialVersion ? 8 : (int)[result count];
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for (int j = 0; j < numLongerBlocks; j++) {
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[(ZXDataMatrixDataBlock *)result[j] codewords].array[longerBlocksNumDataCodewords - 1] = rawCodewords.array[rawCodewordsOffset++];
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}
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NSUInteger max = [(ZXDataMatrixDataBlock *)result[0] codewords].length;
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for (int i = longerBlocksNumDataCodewords; i < max; i++) {
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for (int j = 0; j < [result count]; j++) {
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int jOffset = specialVersion ? (j + 8) % [result count] : j;
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int iOffset = specialVersion && jOffset > 7 ? i - 1 : i;
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[(ZXDataMatrixDataBlock *)result[jOffset] codewords].array[iOffset] = rawCodewords.array[rawCodewordsOffset++];
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}
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}
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if (rawCodewordsOffset != rawCodewords.length) {
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[NSException raise:NSInvalidArgumentException format:@"Codewords size mismatch"];
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}
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return result;
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}
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@end
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