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Avoid left shift of a negative value in flush rank calculation.

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The C standard permits an undefined result for a left shift of a
negative value.
This commit is contained in:
Mark Adler
2015-07-05 13:51:50 -07:00
parent 9859a94c10
commit 8a979f6c79
1 changed files with 1 additions and 1 deletions
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deflate.c
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@@ -156,7 +156,7 @@ struct static_tree_desc_s {int dummy;}; /* for buggy compilers */
#endif #endif
/* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */ /* rank Z_BLOCK between Z_NO_FLUSH and Z_PARTIAL_FLUSH */
#define RANK(f) (((f) << 1) - ((f) > 4 ? 9 : 0)) #define RANK(f) (((f) * 2) - ((f) > 4 ? 9 : 0))
/* =========================================================================== /* ===========================================================================
* Update a hash value with the given input byte * Update a hash value with the given input byte