Github user kvr000 commented on the issue:
https://github.com/apache/commons-compress/pull/21
Update, improving few things:
- made the fields private again
- simplified to single read(long pos, ByteBuffer buf) method
- allocating the instance buffer only for single byte read which is rather
rare (so far it seems that only Bzip2 uses it for reading the header), all
other decompressors and even standard java core readers use internal cache.
- wrapping the byte array passed by parameters instead of creating
temporary ByteBuffer and copying the bytes
Performance improved in comparison to previous commit:
- 15%-20% for stored stream
- 1%-3% for deflated stream
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