Hi,
I have a couple of questions regarding Sanselan.
Firstly is there a user forum for the project I can direct my queries
to?
Secondly, I would like to know if Sanselan is at the point where a tEXt
chunk can be inserted into a PNG image. If so, how is this done? I have
been using v0.94 but I can't make it do what I need.
I wish to embed an XML String containing meta data describing the image
file. I have written the function below. I think I have generated the
PNGChunktEXt correctly but without seeing an example I am not sure. If
it is correct, I still I don't know how to get it into the byte array
holding the png image.
I would appreciate any advice you could give.
static public byte [] changePngMetadata(byte [] pngImage,
String xmlString) throws ImageReadException, IOException
{
String txtString = "TcsMetaData" + '\0' +
xmlString;
PngCrc pngCrc = new PngCrc();
int iCRC = pngCrc.crc(txtString.getBytes(),
txtString.length());
//May want to use compressed text instead. Do I
need to compress the text string separately?
PNGChunktEXt txt = new
PNGChunktEXt(txtString.length(), PngConstants.tEXt, iCRC,
txtString.getBytes());
String kw = txt.getKeyword();
String tx = txt.getText();
//How do I insert txt into pngImage?
return pngImage;
}
Regards,
Ben
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