[antlr-interest] performance issue with skip functionality in generated Java parser for binary data

[Mark Venbrux]

Hi,
First of all: ANTLR is great. Especially with the Eclipse plug-in.
So I tried something difficult to start with. Namely: parsing binary IsoBox 
files. 
This is a file structure with no explicit separators, so you need to 
interpret length fields to parse the structure.
The media content is just a lot of data, so I would like to skip it. But 
performance for big files collapses completely.
 I use the following function to skip data:
 
* private void skipData(int length)
{
InputBuffer buf = getInputBuffer(); 
try {
buf.fill(length);
for (int i = 0; i < length; i++) {
buf.consume();
}
setColumn(getColumn()+length);
} catch (CharStreamException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 
}
*

*Isthere a more optimal way to skip data that one is not interested in?
* 

 -- 
Mvg,

Mark
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