Examples with WriterException com.google.zxing.WriterException used on opensource projects

Example 6 with WriterException

use of com.google.zxing.WriterException in project weex-example by KalicyZhou.

the class Encoder method interleaveWithECBytes.

/**
   * Interleave "bits" with corresponding error correction bytes. On success, store the result in
   * "result". The interleave rule is complicated. See 8.6 of JISX0510:2004 (p.37) for details.
   */
static BitArray interleaveWithECBytes(BitArray bits, int numTotalBytes, int numDataBytes, int numRSBlocks) throws WriterException {
    // "bits" must have "getNumDataBytes" bytes of data.
    if (bits.getSizeInBytes() != numDataBytes) {
        throw new WriterException("Number of bits and data bytes does not match");
    }
    // Step 1.  Divide data bytes into blocks and generate error correction bytes for them. We'll
    // store the divided data bytes blocks and error correction bytes blocks into "blocks".
    int dataBytesOffset = 0;
    int maxNumDataBytes = 0;
    int maxNumEcBytes = 0;
    // Since, we know the number of reedsolmon blocks, we can initialize the vector with the number.
    Collection<BlockPair> blocks = new ArrayList<>(numRSBlocks);
    for (int i = 0; i < numRSBlocks; ++i) {
        int[] numDataBytesInBlock = new int[1];
        int[] numEcBytesInBlock = new int[1];
        getNumDataBytesAndNumECBytesForBlockID(numTotalBytes, numDataBytes, numRSBlocks, i, numDataBytesInBlock, numEcBytesInBlock);
        int size = numDataBytesInBlock[0];
        byte[] dataBytes = new byte[size];
        bits.toBytes(8 * dataBytesOffset, dataBytes, 0, size);
        byte[] ecBytes = generateECBytes(dataBytes, numEcBytesInBlock[0]);
        blocks.add(new BlockPair(dataBytes, ecBytes));
        maxNumDataBytes = Math.max(maxNumDataBytes, size);
        maxNumEcBytes = Math.max(maxNumEcBytes, ecBytes.length);
        dataBytesOffset += numDataBytesInBlock[0];
    }
    if (numDataBytes != dataBytesOffset) {
        throw new WriterException("Data bytes does not match offset");
    }
    BitArray result = new BitArray();
    // First, place data blocks.
    for (int i = 0; i < maxNumDataBytes; ++i) {
        for (BlockPair block : blocks) {
            byte[] dataBytes = block.getDataBytes();
            if (i < dataBytes.length) {
                result.appendBits(dataBytes[i], 8);
            }
        }
    }
    // Then, place error correction blocks.
    for (int i = 0; i < maxNumEcBytes; ++i) {
        for (BlockPair block : blocks) {
            byte[] ecBytes = block.getErrorCorrectionBytes();
            if (i < ecBytes.length) {
                result.appendBits(ecBytes[i], 8);
            }
        }
    }
    if (numTotalBytes != result.getSizeInBytes()) {
        // Should be same.
        throw new WriterException("Interleaving error: " + numTotalBytes + " and " + result.getSizeInBytes() + " differ.");
    }
    return result;
}

Example 7 with WriterException

use of com.google.zxing.WriterException in project weex-example by KalicyZhou.

the class Encoder method chooseVersion.

private static Version chooseVersion(int numInputBits, ErrorCorrectionLevel ecLevel) throws WriterException {
    // In the following comments, we use numbers of Version 7-H.
    for (int versionNum = 1; versionNum <= 40; versionNum++) {
        Version version = Version.getVersionForNumber(versionNum);
        // numBytes = 196
        int numBytes = version.getTotalCodewords();
        // getNumECBytes = 130
        Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
        int numEcBytes = ecBlocks.getTotalECCodewords();
        // getNumDataBytes = 196 - 130 = 66
        int numDataBytes = numBytes - numEcBytes;
        int totalInputBytes = (numInputBits + 7) / 8;
        if (numDataBytes >= totalInputBytes) {
            return version;
        }
    }
    throw new WriterException("Data too big");
}

Example 8 with WriterException

use of com.google.zxing.WriterException in project weex-example by KalicyZhou.

the class Encoder method appendKanjiBytes.

static void appendKanjiBytes(String content, BitArray bits) throws WriterException {
    byte[] bytes;
    try {
        bytes = content.getBytes("Shift_JIS");
    } catch (UnsupportedEncodingException uee) {
        throw new WriterException(uee);
    }
    int length = bytes.length;
    for (int i = 0; i < length; i += 2) {
        int byte1 = bytes[i] & 0xFF;
        int byte2 = bytes[i + 1] & 0xFF;
        int code = (byte1 << 8) | byte2;
        int subtracted = -1;
        if (code >= 0x8140 && code <= 0x9ffc) {
            subtracted = code - 0x8140;
        } else if (code >= 0xe040 && code <= 0xebbf) {
            subtracted = code - 0xc140;
        }
        if (subtracted == -1) {
            throw new WriterException("Invalid byte sequence");
        }
        int encoded = ((subtracted >> 8) * 0xc0) + (subtracted & 0xff);
        bits.appendBits(encoded, 13);
    }
}

Example 9 with WriterException

use of com.google.zxing.WriterException in project zxing by zxing.

the class Encoder method encode.

public static QRCode encode(String content, ErrorCorrectionLevel ecLevel, Map<EncodeHintType, ?> hints) throws WriterException {
    // Determine what character encoding has been specified by the caller, if any
    String encoding = DEFAULT_BYTE_MODE_ENCODING;
    boolean hasEncodingHint = hints != null && hints.containsKey(EncodeHintType.CHARACTER_SET);
    if (hasEncodingHint) {
        encoding = hints.get(EncodeHintType.CHARACTER_SET).toString();
    }
    // Pick an encoding mode appropriate for the content. Note that this will not attempt to use
    // multiple modes / segments even if that were more efficient. Twould be nice.
    Mode mode = chooseMode(content, encoding);
    // This will store the header information, like mode and
    // length, as well as "header" segments like an ECI segment.
    BitArray headerBits = new BitArray();
    // Append ECI segment if applicable
    if (mode == Mode.BYTE && (hasEncodingHint || !DEFAULT_BYTE_MODE_ENCODING.equals(encoding))) {
        CharacterSetECI eci = CharacterSetECI.getCharacterSetECIByName(encoding);
        if (eci != null) {
            appendECI(eci, headerBits);
        }
    }
    // (With ECI in place,) Write the mode marker
    appendModeInfo(mode, headerBits);
    // Collect data within the main segment, separately, to count its size if needed. Don't add it to
    // main payload yet.
    BitArray dataBits = new BitArray();
    appendBytes(content, mode, dataBits, encoding);
    Version version;
    if (hints != null && hints.containsKey(EncodeHintType.QR_VERSION)) {
        int versionNumber = Integer.parseInt(hints.get(EncodeHintType.QR_VERSION).toString());
        version = Version.getVersionForNumber(versionNumber);
        int bitsNeeded = calculateBitsNeeded(mode, headerBits, dataBits, version);
        if (!willFit(bitsNeeded, version, ecLevel)) {
            throw new WriterException("Data too big for requested version");
        }
    } else {
        version = recommendVersion(ecLevel, mode, headerBits, dataBits);
    }
    BitArray headerAndDataBits = new BitArray();
    headerAndDataBits.appendBitArray(headerBits);
    // Find "length" of main segment and write it
    int numLetters = mode == Mode.BYTE ? dataBits.getSizeInBytes() : content.length();
    appendLengthInfo(numLetters, version, mode, headerAndDataBits);
    // Put data together into the overall payload
    headerAndDataBits.appendBitArray(dataBits);
    Version.ECBlocks ecBlocks = version.getECBlocksForLevel(ecLevel);
    int numDataBytes = version.getTotalCodewords() - ecBlocks.getTotalECCodewords();
    // Terminate the bits properly.
    terminateBits(numDataBytes, headerAndDataBits);
    // Interleave data bits with error correction code.
    BitArray finalBits = interleaveWithECBytes(headerAndDataBits, version.getTotalCodewords(), numDataBytes, ecBlocks.getNumBlocks());
    QRCode qrCode = new QRCode();
    qrCode.setECLevel(ecLevel);
    qrCode.setMode(mode);
    qrCode.setVersion(version);
    //  Choose the mask pattern and set to "qrCode".
    int dimension = version.getDimensionForVersion();
    ByteMatrix matrix = new ByteMatrix(dimension, dimension);
    int maskPattern = chooseMaskPattern(finalBits, ecLevel, version, matrix);
    qrCode.setMaskPattern(maskPattern);
    // Build the matrix and set it to "qrCode".
    MatrixUtil.buildMatrix(finalBits, ecLevel, version, maskPattern, matrix);
    qrCode.setMatrix(matrix);
    return qrCode;
}

Example 10 with WriterException

use of com.google.zxing.WriterException in project zxing by zxing.

the class Encoder method appendKanjiBytes.

static void appendKanjiBytes(String content, BitArray bits) throws WriterException {
    byte[] bytes;
    try {
        bytes = content.getBytes("Shift_JIS");
    } catch (UnsupportedEncodingException uee) {
        throw new WriterException(uee);
    }
    int length = bytes.length;
    for (int i = 0; i < length; i += 2) {
        int byte1 = bytes[i] & 0xFF;
        int byte2 = bytes[i + 1] & 0xFF;
        int code = (byte1 << 8) | byte2;
        int subtracted = -1;
        if (code >= 0x8140 && code <= 0x9ffc) {
            subtracted = code - 0x8140;
        } else if (code >= 0xe040 && code <= 0xebbf) {
            subtracted = code - 0xc140;
        }
        if (subtracted == -1) {
            throw new WriterException("Invalid byte sequence");
        }
        int encoded = ((subtracted >> 8) * 0xc0) + (subtracted & 0xff);
        bits.appendBits(encoded, 13);
    }
}