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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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Remove needless calls to open, close, and fileno; call remove instead of unlink.
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Make them safer by avoiding any internal limits and replacing sprintf with std::ostringstream.
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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@599 71b93d88-0707-0410-a8cf-f5a4172ac649