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InputStream impl., incl. mark/reset
- ByteBufferInputStream simply impl. InputStream for an arbitrary 2MiB restricted ByteBuffer
- Users may only need a smaller implementation for 'smaller' file sizes
or for streaming a [native] ByteBuffer.
- MappedByteBufferInputStream impl. InputStream for any file size,
while slicing the total size to memory mapped buffers via the given FileChannel.
The latter are mapped lazily and diff. flush/cache methods are supported
to ease virtual memory usage.
- TestByteBufferInputStream: Basic unit test for basic functionality and perf. stats.
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