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authorGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>2009-03-04 15:05:33 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2009-03-04 15:05:33 +0800
commita1d2f09544065b60598b8167d94a6371bff3e892 (patch)
treecd8b88e7ea0cd44e7e369f670f9fdfcba78f4326 /Documentation
parente9cc8bddaea3944fabfebb968bc88d603239beed (diff)
downloadlinux-a1d2f09544065b60598b8167d94a6371bff3e892.tar.gz
crypto: compress - Add pcomp interface
The current "comp" crypto interface supports one-shot (de)compression only, i.e. the whole data buffer to be (de)compressed must be passed at once, and the whole (de)compressed data buffer will be received at once. In several use-cases (e.g. compressed file systems that store files in big compressed blocks), this workflow is not suitable. Furthermore, the "comp" type doesn't provide for the configuration of (de)compression parameters, and always allocates workspace memory for both compression and decompression, which may waste memory. To solve this, add a "pcomp" partial (de)compression interface that provides the following operations: - crypto_compress_{init,update,final}() for compression, - crypto_decompress_{init,update,final}() for decompression, - crypto_{,de}compress_setup(), to configure (de)compression parameters (incl. allocating workspace memory). The (de)compression methods take a struct comp_request, which was mimicked after the z_stream object in zlib, and contains buffer pointer and length pairs for input and output. The setup methods take an opaque parameter pointer and length pair. Parameters are supposed to be encoded using netlink attributes, whose meanings depend on the actual (name of the) (de)compression algorithm. Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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