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e9567514dd
control of the unknown handling, corrects the pre-existing bug where the per-chunk 'keep' setting is ignored and makes it possible to skip IDAT chunks in the sequential reader (broken in earlier 1.6 versions). There is a new test program, test-unknown.c, which is a work in progress (not currently part of the test suite). Comments in the header files now explain how the unknown handling works.
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.