Example usage for org.apache.poi.util IOUtils readFully

Introduction

In this page you can find the example usage for org.apache.poi.util IOUtils readFully.

Prototype

public static int readFully(InputStream in, byte[] b, int off, int len) throws IOException 

Source Link

Document

Same as the normal InputStream#read(byte[],int,int) , but tries to ensure that the entire len number of bytes is read.

If the end of file is reached before any bytes are read, returns -1.

Usage

From source file:org.apache.tika.parser.image.ICNSParser.java

License:Apache License

public void parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context)
        throws IOException, SAXException, TikaException {
    byte[] header = new byte[4];
    IOUtils.readFully(stream, header, 0, 4); // Extract magic byte
    if (header[0] == (byte) 'i' && header[1] == (byte) 'c' && header[2] == (byte) 'n'
            && header[3] == (byte) 's') {
        // Good, signature found
    } else {/*from w w w.java  2  s . c  om*/
        throw new TikaException("ICNS magic signature invalid");
    }
    IOUtils.readFully(stream, header, 0, 4); //Extract image size/length of bytes in file
    int image_length = java.nio.ByteBuffer.wrap(header).getInt();
    byte[] full_file = new byte[image_length];
    IOUtils.readFully(stream, full_file);
    ArrayList<ICNSType> icons = new ArrayList<>();
    ArrayList<ICNSType> icon_masks = new ArrayList<>();
    byte[] tempByteArray = new byte[4];
    for (int offset = 0; offset < image_length - 8;) {
        //Read the ResType/OSTYpe identifier for sub-icon
        tempByteArray[0] = full_file[offset];
        tempByteArray[1] = full_file[offset + 1];
        tempByteArray[2] = full_file[offset + 2];
        tempByteArray[3] = full_file[offset + 3];
        ICNSType icnstype = findIconType(tempByteArray);

        if (icnstype == null) {
            //exit out of loop
            //No more icons left
            offset = image_length - 8;
        } else if (icnstype.hasMask() == true) {
            icon_masks.add(findIconType(tempByteArray));
        } else {
            icons.add(findIconType(tempByteArray));

        }
        //Read the sub-icon length
        tempByteArray[0] = full_file[offset + 4];
        tempByteArray[1] = full_file[offset + 5];
        tempByteArray[2] = full_file[offset + 6];
        tempByteArray[3] = full_file[offset + 7];
        int icon_length = java.nio.ByteBuffer.wrap(tempByteArray).getInt();
        offset = offset + icon_length;
    }
    String icon_details = "", iconmask_details = "", bitsPerPixel, dimensions;
    for (ICNSType icon : icons) {
        bitsPerPixel = (icon.getBitsPerPixel() != 0) ? icon.getBitsPerPixel() + " bpp"
                : "JPEG 2000 or PNG format";
        dimensions = (!icon.hasRetinaDisplay()) ? (icon.getHeight() + "x" + icon.getWidth())
                : (icon.getHeight() + "x" + icon.getWidth() + "@2X");
        icon_details = icon_details + ", " + dimensions + " (" + bitsPerPixel + ")";
    }
    for (ICNSType icon : icon_masks) {
        iconmask_details = iconmask_details + ", " + icon.getHeight() + "x" + icon.getWidth() + " ("
                + icon.getBitsPerPixel() + " bpp" + ")";
    }

    metadata.set(Metadata.CONTENT_TYPE, ICNS_MIME_TYPE);
    if (!icon_details.equals("")) {
        metadata.set("Icon count", String.valueOf(icons.size()));
        icon_details = icon_details.substring(2);
        metadata.set("Icon details", icon_details);
    }
    if (!iconmask_details.equals("")) {
        metadata.set("Masked icon count", String.valueOf(icon_masks.size()));
        iconmask_details = iconmask_details.substring(2);
        metadata.set("Masked icon details", iconmask_details);
    }
    XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
    xhtml.startDocument();
    xhtml.endDocument();
}

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From source file:org.apache.tika.parser.image.ImageMetadataExtractor.java

License:Apache License

public void parseRawExif(InputStream stream, int length, boolean needsExifHeader)
        throws IOException, SAXException, TikaException {
    byte[] exif;//from  w  w w  .j av a 2 s .c  om
    if (needsExifHeader) {
        exif = new byte[length + 6];
        exif[0] = (byte) 'E';
        exif[1] = (byte) 'x';
        exif[2] = (byte) 'i';
        exif[3] = (byte) 'f';
        IOUtils.readFully(stream, exif, 6, length);
    } else {
        exif = new byte[length];
        IOUtils.readFully(stream, exif, 0, length);
    }
    parseRawExif(exif);
}

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