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由 Kosie van der Merwe 提交于
Summary: `Table::Open()` assumes that `size` correctly describes the size of `file`, added a check that the footer is actually the right size and for good measure added assertions to `Footer::DecodeFrom()`. This was discovered by running `valgrind ./db_test` and seeing that `Footer::DecodeFrom()` was accessing uninitialized memory. Test Plan: make clean check ran `valgrind ./db_test` and saw DBTest.NoSpace no longer complains about a conditional jump being dependent on uninitialized memory. Reviewers: dhruba, vamsi, emayanke, sheki Reviewed By: dhruba CC: leveldb Differential Revision: https://reviews.facebook.net/D7815
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