[PATCH] Calculate file sha1 in block

[Harri Salokorpi]

Hello,

Current sha_file() implementation reads file to memory before 
calculating the hash. Normally this is not a problem, but very large 
files can cause problems. A test case with 700MB file choked my system 
pretty badly.

I changed the implementation to read the file in blocks, which is IMHO 
the right thing to do. Might cause a slight performance hit though.

(no, I don't usually store 700MB binary blobs in SCM ;)

-Harri

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