Reading a GZIP file from a FileChannel (Java NIO)?

You could obtain a wrapping InputStream around the FileChannel.

You could obtain a wrapping InputStream around the FileChannel: FileChannel fc = ... GZIPInputStream gis = new GZIPInputStream(Channels. NewInputStream(fc)); Channels is in Java SE.

Yes, there is a solution. Implementing GZip is fairly simple. You need a Inflater and CRC32, plus reading the header/trailer.

Unfortunately java.util.zip. Inflater takes only byte which is suboptimal (a direct Buffer would have been times more efficient). Yet, using non-direct buffer and ByteBuffer.array() is an option.

The built in java.util.zip. CRC32 is quite slow and reimplementing it in java is a nice step towards performance. Com.jcraft.

Jzlib offers pure java implementation (almost looks like pure C, though) and it's possible to replace the byte w/ direct Buffer. The library is somewhat slower compared to inflater (decomppress) due to too many bounds check and inability to perform so deep inline. Yet, it's faster on compression.

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