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The latter catches underflow/overflow.
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fopen was previuosly called wrapped by QUtil::fopen_wrapper, but QUtil::safe_fopen does this itself, which is less cumbersome.
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Put a specific comment marker next to every piece of code that MSVC gives warning 4996 for. This warning is generated for calls to functions that Microsoft considers insecure or deprecated. This change is in preparation for fixing all these cases even though none of them are actually incorrect or insecure as used in qpdf. The comment marker makes them easier to find so they can be fixed in subsequent commits.
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git-svn-id: svn+q:///qpdf/trunk@709 71b93d88-0707-0410-a8cf-f5a4172ac649
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git-svn-id: svn+q:///qpdf/trunk@690 71b93d88-0707-0410-a8cf-f5a4172ac649
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git-svn-id: svn+q:///qpdf/trunk@607 71b93d88-0707-0410-a8cf-f5a4172ac649
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git-svn-id: svn+q:///qpdf/trunk@599 71b93d88-0707-0410-a8cf-f5a4172ac649