readpng2_check_sig  110 contrib/gregbook/readpng2.h int readpng2_check_sig(uch *sig, int num);
readpng2_check_sig  491 contrib/gregbook/rpng2-win.c         if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {
readpng2_check_sig  521 contrib/gregbook/rpng2-x.c         if (incount < 8 || !readpng2_check_sig(inbuf, 8)) {