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  1. /*
  2. * Copyright 2012 ZXing authors
  3. *
  4. * Licensed under the Apache License, Version 2.0 (the "License");
  5. * you may not use this file except in compliance with the License.
  6. * You may obtain a copy of the License at
  7. *
  8. * http://www.apache.org/licenses/LICENSE-2.0
  9. *
  10. * Unless required by applicable law or agreed to in writing, software
  11. * distributed under the License is distributed on an "AS IS" BASIS,
  12. * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13. * See the License for the specific language governing permissions and
  14. * limitations under the License.
  15. */
  16. @class ZXByteArray, ZXDataMatrixVersion;
  17. /**
  18. * Encapsulates a block of data within a Data Matrix Code. Data Matrix Codes may split their data into
  19. * multiple blocks, each of which is a unit of data and error-correction codewords. Each
  20. * is represented by an instance of this class.
  21. */
  22. @interface ZXDataMatrixDataBlock : NSObject
  23. @property (nonatomic, assign, readonly) int numDataCodewords;
  24. @property (nonatomic, strong, readonly) ZXByteArray *codewords;
  25. /**
  26. * When Data Matrix Codes use multiple data blocks, they actually interleave the bytes of each of them.
  27. * That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This
  28. * method will separate the data into original blocks.
  29. *
  30. * @param rawCodewords bytes as read directly from the Data Matrix Code
  31. * @param version version of the Data Matrix Code
  32. * @return DataBlocks containing original bytes, "de-interleaved" from representation in the
  33. * Data Matrix Code
  34. */
  35. + (NSArray *)dataBlocks:(ZXByteArray *)rawCodewords version:(ZXDataMatrixVersion *)version;
  36. @end