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question asked: Sep 22 '15, 5:06 a.m.
question was seen: 2,305 times
last updated: Sep 22 '15, 5:12 a.m.

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Fetch the first n bytes of a file inside a Change Set in a RTC precondition

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Martin Wassermann (138●6●41●44) | asked Sep 22 '15, 5:06 a.m.
edited Sep 22 '15, 5:12 a.m.
 Hi

I plan to develop a RTC precondition that checks, whether a file that is delivered is a binary file or not. Therefore I would like to read the first n bytes of the files and then look, if it uses mainly usual characters or not.

I already can fetch the content of the files, by getting all IFileItem of the change set and then fetch the content with the IServerSideVersionedContentService: 
IServerSideVersionedContentService contentService =
  (IServerSideVersionedContentService) getService(IServerSideVersionedContentService.class);
ByteArrayOutputStream out = new ByteArrayOutputStream();
contentService.fetchContentTrusted(file,content.getHash(), out);

But with the method fetchContentTrusted I get always the whole file. What I would need, due to performance issues, is only to fetch the first n bytes. Is there a way to get only the first n bytes instead of the whole content?

Thanks and regards

Martin

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