/** * Revert the mask removal done while reading the code words. The bit matrix should revert to its original state. */ internal void remask() { if (parsedFormatInfo == null) { return; // We have no format information, and have no data mask } int dimension = bitMatrix.Height; DataMask.unmaskBitMatrix(parsedFormatInfo.DataMask, bitMatrix, dimension); }
/// <summary> <p>Reads the bits in the {@link BitMatrix} representing the finder pattern in the /// correct order in order to reconstruct the codewords bytes contained within the /// QR Code.</p> /// /// </summary> /// <returns> bytes encoded within the QR Code /// </returns> /// <throws> ReaderException if the exact number of bytes expected is not read </throws> internal byte[] readCodewords() { FormatInformation formatInfo = readFormatInformation(); if (formatInfo == null) { return(null); } Version version = readVersion(); if (version == null) { return(null); } // Get the data mask for the format used in this QR Code. This will exclude // some bits from reading as we wind through the bit matrix. int dimension = bitMatrix.Height; DataMask.unmaskBitMatrix(formatInfo.DataMask, bitMatrix, dimension); BitMatrix functionPattern = version.buildFunctionPattern(); bool readingUp = true; byte[] result = new byte[version.TotalCodewords]; int resultOffset = 0; int currentByte = 0; int bitsRead = 0; // Read columns in pairs, from right to left for (int j = dimension - 1; j > 0; j -= 2) { if (j == 6) { // Skip whole column with vertical alignment pattern; // saves time and makes the other code proceed more cleanly j--; } // Read alternatingly from bottom to top then top to bottom for (int count = 0; count < dimension; count++) { int i = readingUp ? dimension - 1 - count : count; for (int col = 0; col < 2; col++) { // Ignore bits covered by the function pattern if (!functionPattern[j - col, i]) { // Read a bit bitsRead++; currentByte <<= 1; if (bitMatrix[j - col, i]) { currentByte |= 1; } // If we've made a whole byte, save it off if (bitsRead == 8) { result[resultOffset++] = (byte)currentByte; bitsRead = 0; currentByte = 0; } } } } readingUp ^= true; // readingUp = !readingUp; // switch directions } if (resultOffset != version.TotalCodewords) { return(null); } return(result); }