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Fix type mismatch between get_crc_table() and crc_table.

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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.
This commit is contained in:
Mark Adler
2012-04-29 16:18:12 -07:00
parent 1be1179083
commit 6c9bd474aa
7 changed files with 120 additions and 47 deletions
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27
configure vendored
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@@ -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