Example usage for java.io DataInput skipBytes

Introduction

In this page you can find the example usage for java.io DataInput skipBytes.

Prototype

int skipBytes(int n) throws IOException;

Source Link

Document

Makes an attempt to skip over n bytes of data from the input stream, discarding the skipped bytes.

Usage

From source file:org.apache.fop.render.pdf.ImageRawJPEGAdapter.java

/** {@inheritDoc} */
public void outputContents(OutputStream out) throws IOException {
    InputStream in = getImage().createInputStream();
    in = ImageUtil.decorateMarkSupported(in);
    try {// w  w  w.  j  a va 2s.c  o  m
        JPEGFile jpeg = new JPEGFile(in);
        DataInput din = jpeg.getDataInput();

        //Copy the whole JPEG file except:
        // - the ICC profile
        //TODO Thumbnails could safely be skipped, too.
        //TODO Metadata (XMP, IPTC, EXIF) could safely be skipped, too.
        while (true) {
            int reclen;
            int segID = jpeg.readMarkerSegment();
            switch (segID) {
            case JPEGConstants.SOI:
                out.write(0xFF);
                out.write(segID);
                break;
            case JPEGConstants.EOI:
            case JPEGConstants.SOS:
                out.write(0xFF);
                out.write(segID);
                IOUtils.copy(in, out); //Just copy the rest!
                return;
            /*
            case JPEGConstants.APP1: //Metadata
            case JPEGConstants.APPD:
            jpeg.skipCurrentMarkerSegment();
            break;*/
            case JPEGConstants.APP2: //ICC (see ICC1V42.pdf)
                boolean skipICCProfile = false;
                in.mark(16);
                try {
                    reclen = jpeg.readSegmentLength();
                    // Check for ICC profile
                    byte[] iccString = new byte[11];
                    din.readFully(iccString);
                    din.skipBytes(1); //string terminator (null byte)

                    if ("ICC_PROFILE".equals(new String(iccString, "US-ASCII"))) {
                        skipICCProfile = (this.image.getICCProfile() != null);
                    }
                } finally {
                    in.reset();
                }
                if (skipICCProfile) {
                    //ICC profile is skipped as it is already embedded as a PDF object
                    jpeg.skipCurrentMarkerSegment();
                    break;
                }
            default:
                out.write(0xFF);
                out.write(segID);

                reclen = jpeg.readSegmentLength();
                //write short
                out.write((reclen >>> 8) & 0xFF);
                out.write((reclen >>> 0) & 0xFF);
                int left = reclen - 2;
                byte[] buf = new byte[2048];
                while (left > 0) {
                    int part = Math.min(buf.length, left);
                    din.readFully(buf, 0, part);
                    out.write(buf, 0, part);
                    left -= part;
                }
            }
        }
    } finally {
        IOUtils.closeQuietly(in);
    }
}

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From source file:org.apache.geode.pdx.internal.PdxInstanceImpl.java

private static PdxInputStream createDis(DataInput in, int len) {
    PdxInputStream dis;//from  w  w w. ja va 2 s.  c  om
    if (in instanceof PdxInputStream) {
        dis = new PdxInputStream((ByteBufferInputStream) in, len);
        try {
            int bytesSkipped = in.skipBytes(len);
            int bytesRemaining = len - bytesSkipped;
            while (bytesRemaining > 0) {
                in.readByte();
                bytesRemaining--;
            }
        } catch (IOException ex) {
            throw new PdxSerializationException("Could not deserialize PDX", ex);
        }
    } else {
        byte[] bytes = new byte[len];
        try {
            in.readFully(bytes);
        } catch (IOException ex) {
            throw new PdxSerializationException("Could not deserialize PDX", ex);
        }
        dis = new PdxInputStream(bytes);
    }
    return dis;
}

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From source file:org.cloudata.core.common.io.CWritableUtils.java

/**
 * Skip <i>len</i> number of bytes in input stream<i>in</i>
 * @param in input stream/*from ww  w  .  j av a2 s . c  om*/
 * @param len number of bytes to skip
 * @throws IOException when skipped less number of bytes
 */
public static void skipFully(DataInput in, int len) throws IOException {
    int total = 0;
    int cur = 0;

    while ((total < len) && ((cur = in.skipBytes(len - total)) > 0)) {
        total += cur;
    }

    if (total < len) {
        throw new IOException("Not able to skip " + len + " bytes, possibly " + "due to end of input.");
    }
}

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From source file:org.commoncrawl.service.queryserver.index.PositionBasedSequenceFileIndex.java

public void seekReaderToItemAtIndex(SequenceFile.Reader reader, long desiredIndexPos) throws IOException {
    IndexItem indexItem = findIndexDataPosForItemIndex(desiredIndexPos);
    if (indexItem == null) {
        throw new IOException("Invalid Index Position:" + desiredIndexPos);
    }/*ww w  . jav a 2 s  .c o  m*/

    //LOG.info("Seeking to appropriate position in file");
    long timeStart = System.currentTimeMillis();
    reader.seek(indexItem._offsetValue);
    //LOG.info("Seek Took:" + (System.currentTimeMillis() - timeStart));

    DataOutputBuffer skipBuffer = new DataOutputBuffer() {
        @Override
        public void write(DataInput in, int length) throws IOException {
            in.skipBytes(length);
        }
    };

    timeStart = System.currentTimeMillis();

    int skipCount = 0;

    ValueBytes skipValue = reader.createValueBytes();

    long currentIndexPos = indexItem._indexValue;
    while (currentIndexPos < desiredIndexPos) {

        reader.nextRawKey(skipBuffer);
        reader.nextRawValue(skipValue);
        ++skipCount;
        ++currentIndexPos;
    }

    //LOG.info("Skip of:" + skipCount +" Values took:" + (System.currentTimeMillis() - timeStart));

}

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From source file:org.kalypso.shape.dbf.DBFField.java

public static IDBFField read(final DataInput input, final Charset charset) throws IOException, DBaseException {
    final byte[] columnNameBytes = new byte[MAX_COLUMN_NAME_LENGTH];
    input.readFully(columnNameBytes);//from ww w  . j  av  a 2 s . co  m

    final int columNameLength = findColumnNameLength(columnNameBytes);

    final String columnName = new String(columnNameBytes, 0, columNameLength, charset);

    final char columnType = (char) input.readByte();

    input.skipBytes(4);

    // get field length and precision
    final short fieldLength = DataUtils.fixByte(input.readByte());
    final short decimalCount = DataUtils.fixByte(input.readByte());

    input.skipBytes(14);

    final FieldType fieldType = FieldType.valueOf("" + columnType);
    return new DBFField(columnName, fieldType, fieldLength, decimalCount);
}

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From source file:org.netbeans.nbbuild.VerifyClassLinkageForIISI.java

private static void skip(DataInput input, int bytes) throws IOException {
    int skipped = input.skipBytes(bytes);
    if (skipped != bytes) {
        throw new IOException("Truncated class file");
    }/*from  w  w w  . j  a v a 2  s .  c  o  m*/
}

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