On Wed, 2014-09-03 at 14:18 +0200, Milan Crha wrote: > Are you able to recognize affected contacts from the binary diff, or > from anything after the diff is applied?
Well... theoretically perhaps. With a binary diff of course a lot of data from the original file is preserved. So any contact contained entirely within an unchanged part of the file should be unchanged... although it *might* have changed its offset within the file¹. It would be fairly non-trivial to hook into the low-level LZX decompression code and get a list of '{un,}changed ranges' though. Especially when we're applying more than one delta at a time. -- dwmw2 ¹ which matters if we're storing the file offset so that we can recreate the vcard on demand from the original.
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