/// <summary>
/// Gets an instance of an Image.
/// </summary>
/// <param name="url">an URL</param>
/// <returns>an object of type Gif, Jpeg or Png</returns>
public static Image GetInstance(Uri url)
{
Stream istr = null;
try {
WebRequest w = WebRequest.Create(url);
istr = w.GetResponse().GetResponseStream();
int c1 = istr.ReadByte();
int c2 = istr.ReadByte();
int c3 = istr.ReadByte();
int c4 = istr.ReadByte();
// jbig2
int c5 = istr.ReadByte();
int c6 = istr.ReadByte();
int c7 = istr.ReadByte();
int c8 = istr.ReadByte();
istr.Close();
istr = null;
if (c1 == 'G' && c2 == 'I' && c3 == 'F') {
GifImage gif = new GifImage(url);
Image img = gif.GetImage(1);
return img;
}
if (c1 == 0xFF && c2 == 0xD8) {
return new Jpeg(url);
}
if (c1 == 0x00 && c2 == 0x00 && c3 == 0x00 && c4 == 0x0c) {
return new Jpeg2000(url);
}
if (c1 == 0xff && c2 == 0x4f && c3 == 0xff && c4 == 0x51) {
return new Jpeg2000(url);
}
if (c1 == PngImage.PNGID[0] && c2 == PngImage.PNGID[1]
&& c3 == PngImage.PNGID[2] && c4 == PngImage.PNGID[3]) {
Image img = PngImage.GetImage(url);
return img;
}
if (c1 == 0xD7 && c2 == 0xCD) {
Image img = new ImgWMF(url);
return img;
}
if (c1 == 'B' && c2 == 'M') {
Image img = BmpImage.GetImage(url);
return img;
}
if ((c1 == 'M' && c2 == 'M' && c3 == 0 && c4 == 42)
|| (c1 == 'I' && c2 == 'I' && c3 == 42 && c4 == 0)) {
RandomAccessFileOrArray ra = null;
try {
if (url.IsFile) {
String file = url.LocalPath;
ra = new RandomAccessFileOrArray(file);
} else
ra = new RandomAccessFileOrArray(url);
Image img = TiffImage.GetTiffImage(ra, 1);
img.url = url;
return img;
} finally {
if (ra != null)
ra.Close();
}
}
if ( c1 == 0x97 && c2 == 'J' && c3 == 'B' && c4 == '2' &&
c5 == '\r' && c6 == '\n' && c7 == 0x1a && c8 == '\n' ) {
RandomAccessFileOrArray ra = null;
try {
if (url.IsFile) {
String file = url.LocalPath;
ra = new RandomAccessFileOrArray(file);
} else
ra = new RandomAccessFileOrArray(url);
Image img = JBIG2Image.GetJbig2Image(ra, 1);
img.url = url;
return img;
} finally {
if (ra != null)
ra.Close();
}
}
throw new IOException(url.ToString()
+ " is not a recognized imageformat.");
} finally {
if (istr != null) {
istr.Close();
}
}
}
/// <summary>
/// Gets an instance of an Image.
/// </summary>
/// <param name="img">a byte array</param>
/// <returns>an object of type Gif, Jpeg or Png</returns>
public static Image GetInstance(byte[] imgb)
{
int c1 = imgb[0];
int c2 = imgb[1];
int c3 = imgb[2];
int c4 = imgb[3];
if (c1 == 'G' && c2 == 'I' && c3 == 'F') {
GifImage gif = new GifImage(imgb);
return gif.GetImage(1);
}
if (c1 == 0xFF && c2 == 0xD8) {
return new Jpeg(imgb);
}
if (c1 == 0x00 && c2 == 0x00 && c3 == 0x00 && c4 == 0x0c) {
return new Jpeg2000(imgb);
}
if (c1 == 0xff && c2 == 0x4f && c3 == 0xff && c4 == 0x51) {
return new Jpeg2000(imgb);
}
if (c1 == PngImage.PNGID[0] && c2 == PngImage.PNGID[1]
&& c3 == PngImage.PNGID[2] && c4 == PngImage.PNGID[3]) {
return PngImage.GetImage(imgb);
}
if (c1 == 0xD7 && c2 == 0xCD) {
return new ImgWMF(imgb);
}
if (c1 == 'B' && c2 == 'M') {
return BmpImage.GetImage(imgb);
}
if ((c1 == 'M' && c2 == 'M' && c3 == 0 && c4 == 42)
|| (c1 == 'I' && c2 == 'I' && c3 == 42 && c4 == 0)) {
RandomAccessFileOrArray ra = null;
try {
ra = new RandomAccessFileOrArray(imgb);
Image img = TiffImage.GetTiffImage(ra, 1);
if (img.OriginalData == null)
img.OriginalData = imgb;
return img;
} finally {
if (ra != null)
ra.Close();
}
}
throw new IOException("The byte array is not a recognized imageformat.");
}
