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03df189954
in the code the number of elements in an array is calculated using sizeof. This generates a compile time constant of type (size_t) which is then typically assigned to an (unsigned int) or (int). Some versions of GCC on 64-bit systems warn about the apparent narrowing, even though the same compiler does apparently generate the correct, in-range, numeric constant. This adds appropriate, safe, casts to make the warnings go away.
This "contrib" directory contains contributions which are not necessarily under the libpng license, although all are open source. They are not part of libpng proper and are not used for building the library.