Examples with InflaterInputStream java.util.zip.InflaterInputStream used on opensource projects

Example 31 with InflaterInputStream

use of java.util.zip.InflaterInputStream in project poi by apache.

the class ExOleObjStg method getData.

/**
     * Opens an input stream which will decompress the data on the fly.
     *
     * @return the data input stream.
     */
public InputStream getData() {
    if (isCompressed()) {
        int size = LittleEndian.getInt(_data);
        InputStream compressedStream = new ByteArrayInputStream(_data, 4, _data.length);
        return new BoundedInputStream(new InflaterInputStream(compressedStream), size);
    } else {
        return new ByteArrayInputStream(_data, 0, _data.length);
    }
}

Example 32 with InflaterInputStream

use of java.util.zip.InflaterInputStream in project poi by apache.

the class EscherMetafileBlip method inflatePictureData.

/**
     * Decompresses the provided data, returning the inflated result.
     *
     * @param data the deflated picture data.
     * @return the inflated picture data.
     */
private static byte[] inflatePictureData(byte[] data) {
    try {
        InflaterInputStream in = new InflaterInputStream(new ByteArrayInputStream(data));
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buf = new byte[4096];
        int readBytes;
        while ((readBytes = in.read(buf)) > 0) {
            out.write(buf, 0, readBytes);
        }
        return out.toByteArray();
    } catch (IOException e) {
        log.log(POILogger.WARN, "Possibly corrupt compression or non-compressed data", e);
        return data;
    }
}

Example 33 with InflaterInputStream

use of java.util.zip.InflaterInputStream in project poi by apache.

the class EscherPictBlip method inflatePictureData.

/**
     * Decompresses the provided data, returning the inflated result.
     *
     * @param data the deflated picture data.
     * @return the inflated picture data.
     */
private static byte[] inflatePictureData(byte[] data) {
    try {
        InflaterInputStream in = new InflaterInputStream(new ByteArrayInputStream(data));
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        byte[] buf = new byte[4096];
        int readBytes;
        while ((readBytes = in.read(buf)) > 0) {
            out.write(buf, 0, readBytes);
        }
        return out.toByteArray();
    } catch (IOException e) {
        log.log(POILogger.INFO, "Possibly corrupt compression or non-compressed data", e);
        return data;
    }
}

Example 34 with InflaterInputStream

use of java.util.zip.InflaterInputStream in project poi by apache.

the class PICT method read.

private byte[] read(byte[] data, int pos) throws IOException {
    ByteArrayInputStream bis = new ByteArrayInputStream(data);
    Header header = new Header();
    header.read(data, pos);
    long bs_exp = (long) pos + header.getSize();
    long bs_act = bis.skip(bs_exp);
    if (bs_exp != bs_act) {
        throw new EOFException();
    }
    byte[] chunk = new byte[4096];
    ByteArrayOutputStream out = new ByteArrayOutputStream(header.getWmfSize());
    InflaterInputStream inflater = new InflaterInputStream(bis);
    try {
        int count;
        while ((count = inflater.read(chunk)) >= 0) {
            out.write(chunk, 0, count);
            // PICT zip-stream can be erroneous, so we clear the array to determine
            // the maximum of read bytes, after the inflater crashed
            bytefill(chunk, (byte) 0);
        }
    } catch (Exception e) {
        int lastLen;
        for (lastLen = chunk.length - 1; lastLen >= 0 && chunk[lastLen] == 0; lastLen--) ;
        if (++lastLen > 0) {
            if (header.getWmfSize() > out.size()) {
                // sometimes the wmfsize is smaller than the amount of already successfully read bytes
                // in this case we take the lastLen as-is, otherwise we truncate it to the given size
                lastLen = Math.min(lastLen, header.getWmfSize() - out.size());
            }
            out.write(chunk, 0, lastLen);
        }
        // End of picture marker for PICT is 0x00 0xFF
        LOG.log(POILogger.ERROR, "PICT zip-stream is invalid, read as much as possible. Uncompressed length of header: " + header.getWmfSize() + " / Read bytes: " + out.size(), e);
    } finally {
        inflater.close();
    }
    return out.toByteArray();
}

Example 35 with InflaterInputStream

use of java.util.zip.InflaterInputStream in project poi by apache.

the class EMF method getData.

@Override
public byte[] getData() {
    try {
        byte[] rawdata = getRawData();
        ByteArrayOutputStream out = new ByteArrayOutputStream();
        InputStream is = new ByteArrayInputStream(rawdata);
        Header header = new Header();
        header.read(rawdata, CHECKSUM_SIZE);
        long len = is.skip(header.getSize() + (long) CHECKSUM_SIZE);
        assert (len == header.getSize() + CHECKSUM_SIZE);
        InflaterInputStream inflater = new InflaterInputStream(is);
        byte[] chunk = new byte[4096];
        int count;
        while ((count = inflater.read(chunk)) >= 0) {
            out.write(chunk, 0, count);
        }
        inflater.close();
        return out.toByteArray();
    } catch (IOException e) {
        throw new HSLFException(e);
    }
}