Yes, images are not compressed in ZIM files, as Emmanuel pointed out.
Also, I have tried decompressing a LZMA compressed file on an Android phone (HTC Wildfire to be precise), and the decompression speed is not a problem.
LZMA-Java is under frequent development by Lasse Collin, so we should make sure that the latest code is used.
On Sat, Sep 24, 2011 at 6:00 PM, Emmanuel Engelhart emmanuel@engelhart.orgwrote:
On 24/09/2011 14:24, Christian Pühringer wrote:
The JAVA liblzma performance is pretty bad: To increase efficiency of compression in the zim-format articles (and also all other data like images) are stored in clusters. Cluster size is
apparently about
1 MB. This implies that loading an article which is stored at the end of a cluster involves decompressing the
complete
cluster.
Images should not be compressed in ZIM files for the obvious reasons they mainly are already compressed. This is the case for all ZIM files I made. As far as I know this is also the case for Mediawiki:Collection build ZIM files.
Emmanuel
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