[TAPESTRY-305] Wrong example for file download - ASF JIRA

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Method InputStream.read(buffer) returns number of bytes read into the buffer.

Tapestry FAQ contains example "How do I stream a file to the user from tapestry?":
byte[] data = new byte[1024];
...
while (in.read(data) > -1)

{ out.write(data); }

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It should be something like:
int len;
while ((len = in.read(data)) > -1)

{ out.write(data, 0, len); }

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Or I'm wrong and response.setContentLength() will handle this?