72730ee48e
* Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs. * Removed png_snprintf and added formatted warning messages. This change adds internal APIs to allow png_warning messages to have parameters without requiring the host OS to implement snprintf. As a side effect the dependency of the tIME-supporting RFC1132 code on stdio is removed and PNG_NO_WARNINGS does actually work now. * Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte optimization configureable. * IDAT compression failed if preceded by a compressed text chunk (bug introduced in libpng-1.5.3beta01-02). This was because the attempt to reset the zlib stream in png_write_IDAT happened after the first IDAT chunk had been deflated - much too late. In this change internal functions were added to claim/release the z_stream and, hopefully, make the code more robust. Also deflateEnd checking is added - previously libpng would ignore an error at the end of the stream. |
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