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From: Anton A. <ai...@ca...> - 2004-02-27 10:35:46
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On Fri, 2004-02-27 at 05:52, nag talekar wrote: > hi > thanks for replying > can u please explain on multi sector transfer fixups? see http://linux-ntfs.sourceforge.net/ntfs/concepts/fixup.html and/or in ntfsprogs/libntfs/mst.c::ntfs_mst_post_read_fixup() for code of how to do it. > problem is converting from vcn to lcn see http://linux-ntfs.sourceforge.net/ntfs/concepts/data_runs.html and/or in ntfsprogs/libntfs/runlist.c::ntfs_mapping_pairs_decompress() for code that decompresses the mapping pairs array into data runs and in ntfsprogs/libntfs/runlist.c::ntfs_rl_vcn_to_lcn() for code that converts a vcn to an lcn. Also see ntfsprogs/libntfs/attrib.c::ntfs_attr_vcn_to_lcn() which also copes with not fully read into memory run lists. Note that if you use any of our code you must publish your code under GPL license, too. > why do i go to invalid INdex records even when my > calculations of LCNs using data runs r correct? Obviously your calculations are not correct! > when does this problem arise? When you have done something wrong... > can i access all index records by only going thru > dataruns without going thru the b+ tree Yes, of course. You just need to check that the corresponding index record is allocated as described by the BITMAP attribute corresponding to the INDEX_ALLOCATION attribute you are looking at. > i cant use ur library as i am developing in a different environment Out of curiosity, what environment is that? It would be a lot easier to help you if you showed your code... Best regards, Anton -- Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/ |
