Help! Help! "URLStream":How to read part byte?

I use pdf2swf.exe will PDF convert to SWF,Used for the on-line browsing.
How to use URLStream data read part of data flow, and closed after already got the data to display properly.
Similar to realize(Demo):http://wenku.baidu.com/view/c67fc3ec0975f46527d3e1ee.html
i'm Chinese,my English Maybe very poor,I hope you can see clearly.thank!

Try use such code:
String str = convertToStringFromBytes(input,count).trim();
System.out.println(Integer.valueOf(str,2).byteValue());

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