Examples of javax.imageio.stream.ImageInputStream

javax.imageio.stream.ImageInputStream
A seekable input stream interface for use by ImageReaders. Various input sources, such as InputStreams and Files, as well as future fast I/O sources may be "wrapped" by a suitable implementation of this interface for use by the Image I/O API. @see ImageInputStreamImpl @see FileImageInputStream @see FileCacheImageInputStream @see MemoryCacheImageInputStream

    public boolean canDecodeInput(Object input) throws IOException {
        if (!(input instanceof ImageInputStream)) {
            return false;
        }


        ImageInputStream stream = (ImageInputStream)input;
        byte[] b = new byte[8];
        stream.mark();
        stream.readFully(b);
        stream.reset();


        return (b[0] == (byte)137 &&
                b[1] == (byte)80 &&
                b[2] == (byte)78 &&
                b[3] == (byte)71 &&

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    }


    public InputStream nextElement() {
        try {
            firstTime = false;
            ImageInputStream iis = new SubImageInputStream(stream, length);
            return new InputStreamAdapter(iis);
        } catch (IOException e) {
            return null;
        }
    }

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    public boolean canDecodeInput(Object source) throws IOException {
        if (!(source instanceof ImageInputStream)) {
            return false;
        }


        ImageInputStream stream = (ImageInputStream)source;
        byte[] b = new byte[2];
        stream.mark();
        stream.readFully(b);
        stream.reset();


        return (b[0] == 0x42) && (b[1] == 0x4d);
    }

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    public boolean canDecodeInput(Object source) throws IOException {
        if (!(source instanceof ImageInputStream)) {
            return false;
        }


        ImageInputStream stream = (ImageInputStream)source;
        byte[] b = new byte[3];


        stream.mark();
        stream.readFully(b);
        stream.reset();


        return ((b[0] == (byte)0) &&  // TypeField == 0
                b[1] == 0 && // FixHeaderField == 0xxx00000; not support ext header
                ((b[2] & 0x8f) != 0 || (b[2] & 0x7f) != 0));  // First width byte
                //XXX: b[2] & 0x8f) != 0 for the bug in Sony Ericsson encoder.

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    public boolean canDecodeInput(Object input) throws IOException {
        if (!(input instanceof ImageInputStream)) {
            return false;
        }
        
        ImageInputStream stream = (ImageInputStream)input;
        byte[] b = new byte[6];
        stream.mark();
        stream.readFully(b);
        stream.reset();


        return b[0] == 'G' && b[1] == 'I' && b[2] == 'F' && b[3] == '8' &&
            (b[4] == '7' || b[4] == '9') && b[5] == 'a';
    }

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    public boolean canDecodeInput(Object input) throws IOException {
        if (!(input instanceof ImageInputStream)) {
            return false;
        }


        ImageInputStream stream = (ImageInputStream)input;
        byte[] b = new byte[8];
        stream.mark();
        stream.readFully(b);
        stream.reset();
        
        return (b[0] == (byte)137 &&
                b[1] == (byte)80 &&
                b[2] == (byte)78 &&
                b[3] == (byte)71 &&

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    }


    public Object nextElement() {
        try {
            firstTime = false;
            ImageInputStream iis = new SubImageInputStream(stream, length);
            return new InputStreamAdapter(iis);
        } catch (IOException e) {
            return null;
        }
    }

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    public boolean canDecodeInput(Object source) throws IOException {
        if (!(source instanceof ImageInputStream)) {
            return false;
        }
        ImageInputStream iis = (ImageInputStream) source;
        iis.mark();
        // If the first two bytes are a JPEG SOI marker, it's probably
        // a JPEG file.  If they aren't, it definitely isn't a JPEG file.
        int byte1 = iis.read();
        int byte2 = iis.read();
        iis.reset();
        if ((byte1 == 0xFF) && (byte2 == JPEG.SOI)) {
            return true;
        }
        return false;
    }

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    public void setImageBytes(Resource buffer) throws GeoWebCacheException {
        Assert.notNull(buffer, "WMSMetaTile.setImageBytes() received null");
        Assert.isTrue(buffer.getSize() > 0, "WMSMetaTile.setImageBytes() received empty contents");


        try {
            ImageInputStream imgStream;
            imgStream = new ResourceImageInputStream(((ByteArrayResource) buffer).getInputStream());
            RenderedImage metaTiledImage = ImageIO.read(imgStream);// read closes the stream for us
            setImage(metaTiledImage);
        } catch (IOException ioe) {
            throw new GeoWebCacheException("WMSMetaTile.setImageBytes() "

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        }


        public boolean filter(Object elt) {
            try {
                ImageReaderSpi spi = (ImageReaderSpi)elt;
                ImageInputStream stream = null;
                if (input instanceof ImageInputStream) {
                    stream = (ImageInputStream)input;
                }
                
                // Perform mark/reset as a defensive measure
                // even though plug-ins are supposed to take
                // care of it.
                boolean canDecode = false;
                if (stream != null) {
                    stream.mark();
                }
                canDecode = spi.canDecodeInput(input);
                if (stream != null) {
                    stream.reset();
                }
                
                return canDecode;
            } catch (IOException e) {
                return false;

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