Fix type mismatch between get_crc_table() and crc_table.

crc_table is made using a four-byte integer (when that can be
determined).  However get_crc_table() returned a pointer to an
unsigned long, which could be eight bytes.  This fixes that by
creating a new z_crc_t type for the crc_table.

This type is also used for the BYFOUR crc calculations that depend
on a four-byte type.  The four-byte type can now be determined by
./configure, which also solves a problem where ./configure --solo
would never use BYFOUR.  No the Z_U4 #define indicates that four-
byte integer was found either by ./configure or by zconf.h.

1 files changed, 27 insertions, 0 deletions

diff --git a/configure b/configure
index e672f36..6baa34f 100755
--- a/configure
+++ b/configure
@@ -698,6 +698,32 @@ EOF
   fi
 fi
 
+echo >> configure.log
+
+# find a four-byte unsiged integer type for crc calculations
+cat > $test.c <<EOF
+#include <stdio.h>
+#define is32(n,t) for(n=1,k=0;n;n<<=1,k++);if(k==32){puts(t);return 0;}
+int main() {
+    int k;
+    unsigned i;
+    unsigned long l;
+    unsigned short s;
+    is32(i, "unsigned")
+    is32(l, "unsigned long")
+    is32(s, "unsigned short")
+    return 1;
+}
+EOF
+Z_U4=""
+if try $CC $CFLAGS $test.c -o $test && Z_U4=`$test` && test -n "$Z_U4"; then
+  sed < zconf.h "/#define Z_U4/s/\/\* \.\/configure may/#define Z_U4 $Z_U4   \/* .\/configure put the/" > zconf.temp.h
+  mv zconf.temp.h zconf.h
+  echo "Looking for a four-byte integer type... Found." | tee -a configure.log
+else
+  echo "Looking for a four-byte integer type... Not found." | tee -a configure.log
+fi
+
 # clean up files produced by running the compiler and linker
 rm -f $test.[co] $test $test$shared_ext $test.gcno
 
@@ -724,6 +750,7 @@ echo SHAREDLIBV = $SHAREDLIBV >> configure.log
 echo STATICLIB = $STATICLIB >> configure.log
 echo TEST = $TEST >> configure.log
 echo VER = $VER >> configure.log
+echo Z_U4 = $Z_U4 >> configure.log
 echo exec_prefix = $exec_prefix >> configure.log
 echo includedir = $includedir >> configure.log
 echo libdir = $libdir >> configure.log