I want to create an InputStream that is limited to a certain range of bytes in file, e.g. to bytes from position 0 to 100. So that the client code should see EOF once 100th byte is reached.
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I want to create an InputStream that is limited to a certain range of bytes in file, e.g. to bytes from position 0 to 100. So that the client code should see EOF once 100th byte is reached.
The
read()method ofInputStreamreads a single byte at a time. You could write a subclass ofInputStreamthat maintains an internal counter; each timeread()is called, update the counter. If you have hit your maximum, do not allow any further reads (return -1 or something like that).You will also need to ensure that the other methods for reading
read_int, etc are unsupported (ex: Override them and just throw UnsupportedOperationException());I don’t know what your use case is, but as a bonus you may want to implement buffering as well.