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[CLOUDSTACK-9423] Add ability to get virtual size of compressed VHDsWith object store like Swift as secondary storage, if a compressed VHD is uploaded as a template, the `VHDProcessor` incorrectly calculates the virutal size leading to the template being useless. This fix tries to guess the virtual size by partially decompressing it and falls back to a sensible default which is the size of the file. Before the fix: template.properties on Swift ``` uniquename=routing-1 filename=routing-1.vhd size=263417314 virtualsize=2894447637315205059 ``` After the fix ``` uniquename=routing-1 filename=routing-1.vhd size=263417314 virtualsize=3145728000 ``` Look at the `virutalsize` in both cases * pr/1598: [CLOUDSTACK-9423] Add ability to get virtual size of compressed VHDs Signed-off-by: Will Stevens <williamstevens@gmail.com>