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Add isHeuristicBinaryFile(), a git-like check for binariness of fiels
Summary: This is separated from D812. See D812, D1008, D1009. Separation allows us to land these patches safely. See T452 for a broader discussion of the issues involved. Test Plan: See D812. Reviewers: davidreuss, jungejason, nh, tuomaspelkonen, aran Reviewed By: davidreuss CC: aran, davidreuss Differential Revision: 1040
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@ -23,6 +23,20 @@
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*/
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final class ArcanistDiffUtils {
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/**
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* Make a best-effort attempt to determine if a file is definitely binary.
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*
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* @return bool If true, the file is almost certainly binary. If false, the
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* file might still be binary but is subtle about it.
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*/
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public static function isHeuristicBinaryFile($data) {
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// Detect if a file is binary according to the Git heuristic, which is the
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// presence of NULL ("\0") bytes. Git only examines the first "few" bytes of
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// each file (8KB or so) as an optimization, but we don't have a reasonable
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// equivalent in PHP, so just look at all of it.
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return (strpos($data, "\0") !== false);
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}
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public static function renderDifferences(
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$old,
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$new,
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