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 static BufferedImage read(File input) throws IOException {
        if (input == null) {
            throw new IllegalArgumentException("input == null!");
        }


        ImageInputStream stream = createImageInputStream(input);
        return read(stream);
    }

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    public static BufferedImage read(InputStream input) throws IOException {
        if (input == null) {
            throw new IllegalArgumentException("input == null!");
        }


        ImageInputStream stream = createImageInputStream(input);
        return read(stream);
    }

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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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        }
        if (!input.canRead()) {
            throw new IIOException("Can't read input file!");
        }


        ImageInputStream stream = createImageInputStream(input);
        if (stream == null) {
            throw new IIOException("Can't create an ImageInputStream!");
        }
        BufferedImage bi = read(stream);
        if (bi == null) {
            stream.close();
        }
        return bi;
    }

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    public static BufferedImage read(InputStream input) throws IOException {
        if (input == null) {
            throw new IllegalArgumentException("input == null!");
        }


        ImageInputStream stream = createImageInputStream(input);
        BufferedImage bi = read(stream);
        if (bi == null) {
            stream.close();
        }
        return bi;
    }

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        try {
            istream = input.openStream();
        } catch (IOException e) {
            throw new IIOException("Can't get input stream from URL!", e);
        }
        ImageInputStream stream = createImageInputStream(istream);
        BufferedImage bi;
        try {
            bi = read(stream);
            if (bi == null) {
                stream.close();
            }
        } finally {
            istream.close();
        }
        return bi;

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


        ImageInputStream stream = (ImageInputStream)source;


        stream.mark();
        try {
            int type = stream.readByte();   // TypeField
            int fixHeaderField = stream.readByte();
            // check WBMP "header"
            if (type != 0 || fixHeaderField != 0) {
                // while WBMP reader does not support ext WBMP headers
                return false;
            }


            int width = ReaderUtil.readMultiByteInteger(stream);
            int height = ReaderUtil.readMultiByteInteger(stream);
            // check image dimension
            if (width <= 0 || height <= 0) {
                return false;
            }


            long dataLength = stream.length();
            if (dataLength == -1) {
                // We can't verify that amount of data in the stream
                // corresponds to image dimension because we do not know
                // the length of the data stream.
                // Assuming that wbmp image are used for mobile devices,
                // let's introduce an upper limit for image dimension.
                // In case if exact amount of raster data is unknown,
                // let's reject images with dimension above the limit.
                return (width < MAX_WBMP_WIDTH) && (height < MAX_WBMP_HEIGHT);
            }


            dataLength -= stream.getStreamPosition();


            long scanSize = (width / 8) + ((width % 8) == 0 ? 0 : 1);


            return (dataLength == scanSize * height);
        } finally {
            stream.reset();
        }
    }

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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 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 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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