aaaaa

src/check/calc_checksum.c

@@ -0,0 +1,24 @@
+#include <stdio.h>
+
+int main(int argc, char** argv) {
+  if (argc<2) {
+    printf("usage: %s text\n",argv[0]);
+    return 1;
+  }
+
+  unsigned int checker=0x11111111;
+  unsigned int checker1=0;
+  int index=0;
+
+  for (char* i=argv[1]; *i; i++) {
+    checker^=((unsigned int)(*i))<<index;
+    checker1+=(unsigned int)(*i);
+    checker=(checker>>1|(((checker)^(checker>>2)^(checker>>3)^(checker>>5))&1)<<31);
+    checker1<<=1;
+    index=(index+1)&31;
+  }
+
+  printf("%.8x %x\n",checker,checker1);
+
+  return 0;
+}