/*
 * Copyright 2012 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.
 */

@class ZXByteArray, ZXQRCodeErrorCorrectionLevel, ZXQRCodeVersion;

/**
 * Encapsulates a block of data within a QR Code. QR Codes may split their data into
 * multiple blocks, each of which is a unit of data and error-correction codewords. Each
 * is represented by an instance of this class.
 */
@interface ZXQRCodeDataBlock : NSObject

@property (nonatomic, strong, readonly) ZXByteArray *codewords;
@property (nonatomic, assign, readonly) int numDataCodewords;

- (id)initWithNumDataCodewords:(int)numDataCodewords codewords:(ZXByteArray *)codewords;

/**
 * When QR Codes use multiple data blocks, they are actually interleaved.
 * That is, the first byte of data block 1 to n is written, then the second bytes, and so on. This
 * method will separate the data into original blocks.
 *
 * @param rawCodewords bytes as read directly from the QR Code
 * @param version version of the QR Code
 * @param ecLevel error-correction level of the QR Code
 * @return DataBlocks containing original bytes, "de-interleaved" from representation in the
 *         QR Code
 */
+ (NSArray *)dataBlocks:(ZXByteArray *)rawCodewords version:(ZXQRCodeVersion *)version ecLevel:(ZXQRCodeErrorCorrectionLevel *)ecLevel;

@end