Fix UCNs machine with >= 32bit longs

originally submitted by Bill Tutt

Note: This code is actually going to be replaced in 2.0 by /F's new
database.  Until then, this patch keeps the test suite working.

Modules/ucnhash.c

@@ -11,7 +11,7 @@
  * perfect_hash.py: 
  * http://starship.python.net/crew/amk/python/code/perfect-hash.html
  *
- * Generated on: Wed Jun 28 03:34:07 2000
+ * Generated on: Fri Jul 14 08:00:58 2000
  */
 
 #define k_cHashElements 18836
@@ -26,20 +26,36 @@ static long f1(const char *key, unsigned int cch)
 {
     register int len;
     register unsigned char *p;
-    register long x;
+    register unsigned long x;
 
     len = cch;
     p = (unsigned char *) key;
-    x = 1694245428;
+    x = 0x64fc2234;
     while (--len >= 0)
-        x = (1000003*x) ^ toupper(*(p++));
+    {   
+        /* (1000003 * x) ^ toupper(*(p++)) 
+         * translated to handle > 32 bit longs 
+         */
+        x = (0xf4243 * x);
+        x = x & 0xFFFFFFFF;
+        x = x ^ toupper(*(p++));
+    }
     x ^= cch + 10;
-    if (x == -1)
+    if (x == 0xFFFFFFFF)
-        x = -2;
+        x = 0xfffffffe;
+    if (x & 0x80000000) 
+    {
+        /* Emulate 32-bit signed (2's complement) modulo operation */
+        x = (~x & 0xFFFFFFFF) + 1;
+        x %= k_cHashElements;
+        if (x != 0)
+        {
+            x = x + (~k_cHashElements & 0xFFFFFFFF) + 1;
+            x = (~x & 0xFFFFFFFF) + 1;
+        }
+    }
+    else
         x %= k_cHashElements;
-    /* ensure the returned value is positive so we mimic Python's % operator */
-    if (x < 0)
-      x += k_cHashElements;
     return x;
 }
 
@@ -48,20 +64,36 @@ static long f2(const char *key, unsigned int cch)
 {
     register int len;
     register unsigned char *p;
-    register long x;
+    register unsigned long x;
 
     len = cch;
     p = (unsigned char *) key;
-    x = -1917331657;
+    x = 0x8db7d737;
     while (--len >= 0)
-        x = (1000003*x) ^ toupper(*(p++));
+    {   
+        /* (1000003 * x) ^ toupper(*(p++)) 
+         * translated to handle > 32 bit longs 
+         */
+        x = (0xf4243 * x);
+        x = x & 0xFFFFFFFF;
+        x = x ^ toupper(*(p++));
+    }
     x ^= cch + 10;
-    if (x == -1)
+    if (x == 0xFFFFFFFF)
-        x = -2;
+        x = 0xfffffffe;
+    if (x & 0x80000000) 
+    {
+        /* Emulate 32-bit signed (2's complement) modulo operation */
+        x = (~x & 0xFFFFFFFF) + 1;
+        x %= k_cHashElements;
+        if (x != 0)
+        {
+            x = x + (~k_cHashElements & 0xFFFFFFFF) + 1;
+            x = (~x & 0xFFFFFFFF) + 1;
+        }
+    }
+    else
         x %= k_cHashElements;
-    /* ensure the returned value is positive so we mimic Python's % operator */
-    if (x < 0)
-      x += k_cHashElements;
     return x;
 }
 

Tools/perfecthash/GenUCNHash.py

@@ -12,8 +12,8 @@ import perfect_hash
 
 # These variables determine which hash function is tried first.
 # Yields a multiple of 1.7875 for UnicodeData.txt on 2000/06/24/
-f1Seed = 1694245428
+f1Seed = 0x64fc2234 
-f2Seed = -1917331657
+f2Seed = 0x8db7d737 
 
 # Maximum allowed multipler, if this isn't None then instead of continually
 # increasing C, it resets it back to initC to keep searching for

Tools/perfecthash/perfect_hash.py

@@ -73,25 +73,29 @@ class Hash:
       key = str(key)
       if self.caseInsensitive:
         key = string.upper(key)
-      x = perfhash.hash(self.seed, len(self.junk), key) % self.N
+      x = perfhash.hash(self.seed, len(self.junk), key, self.N) 
-      #h = hash(self.junk + key) % self.N
-      #assert x == h
       return x
       
     def generate_code(self):
       s = """{
     register int len;
     register unsigned char *p;
-    register long x;
+    register unsigned long x;
 
     len = cch;
     p = (unsigned char *) key;
-    x = %(junkSeed)d;
+    x = %(junkSeed)s;
     while (--len >= 0)
-        x = (1000003*x) ^ """ % \
+    {   
+        /* (1000003 * x) ^ toupper(*(p++)) 
+         * translated to handle > 32 bit longs 
+         */
+        x = (0xf4243 * x);
+        x = x & 0xFFFFFFFF;
+        x = x ^ """ % \
       {
         "lenJunk" : len(self.junk),
-        "junkSeed" : self.seed,
+        "junkSeed" : hex(self.seed),
       }
       
       if self.caseInsensitive:
@@ -99,20 +103,29 @@ class Hash:
       else:
         s = s + "*(p++);"
       s = s + """
+    }
     x ^= cch + %(lenJunk)d;
-    if (x == -1)
+    if (x == 0xFFFFFFFF)
-        x = -2;
+        x = 0xfffffffe;
+    if (x & 0x80000000) 
+    {
+        /* Emulate 32-bit signed (2's complement) modulo operation */
+        x = (~x & 0xFFFFFFFF) + 1;
+        x %%= k_cHashElements;
+        if (x != 0)
+        {
+            x = x + (~k_cHashElements & 0xFFFFFFFF) + 1;
+            x = (~x & 0xFFFFFFFF) + 1;
+        }
+    }
+    else
         x %%= k_cHashElements;
-    /* ensure the returned value is positive so we mimic Python's %% operator */
-    if (x < 0)
-      x += k_cHashElements;
     return x;
 }
 """ % { "lenJunk" : len(self.junk),
-        "junkSeed" : self.seed, }
+        "junkSeed" : hex(self.seed), }
       return s
         
-
 WHITE, GREY, BLACK = 0,1,2
 class Graph:
     """Graph class.  This class isn't particularly efficient or general,
@@ -139,8 +152,8 @@ class Graph:
         value 'value'"""
         
         if vertex1 > vertex2: vertex1, vertex2 = vertex2, vertex1
-#        if self.edges.has_key( (vertex1, vertex2) ):
+        if self.edges.has_key( (vertex1, vertex2) ):
-#            raise ValueError, 'Collision: vertices already connected'
+            raise ValueError, 'Collision: vertices already connected'
         self.edges[ (vertex1, vertex2) ] = value
 
         # Add vertices to each other's reachable list
@@ -341,8 +354,8 @@ typedef struct %(structName)s
 """ % (self.cHashElements, self.cchMax, self.cKeys)
     
     code = code + """
-static const %s G[k_cHashElements]; 
+staticforward const %s G[k_cHashElements]; 
-static const %s %s[k_cKeys];   
+staticforward const %s %s[k_cKeys];   
 """ % (self.type, dataArrayType, dataArrayName)
     
     code = code + """
@@ -598,8 +611,9 @@ def generate_hash(keys, caseInsensitive=0,
     sys.stderr.write('Found perfect hash function!\n')
     sys.stderr.write('\nIn order to regenerate this hash function, \n')
     sys.stderr.write('you need to pass these following values back in:\n')
-    sys.stderr.write('f1 seed: %s\n' % repr(f1.seed))
+    sys.stderr.write('f1 seed: %s\n' % hex(f1.seed))
-    sys.stderr.write('f2 seed: %s\n' % repr(f2.seed))
+    sys.stderr.write('f2 seed: %s\n' % hex(f2.seed))
     sys.stderr.write('initial multipler: %s\n' % c)
 
     return PerfectHash(cchMaxKey, f1, f2, G, N, len(keys), maxHashValue)
+

Tools/perfecthash/perfhash.c

@@ -5,11 +5,13 @@ static PyObject * hashFunction(PyObject *self, PyObject *args, PyObject *kw)
 	PyStringObject *a;
 	register int len;
 	register unsigned char *p;
-	register long x;
+	register unsigned long x;
-	long lSeed;
+	unsigned long ulSeed;
 	unsigned long cchSeed;
+	unsigned long cHashElements;
 
-	if (!PyArg_ParseTuple(args, "iiO:hash", &lSeed, &cchSeed, &a))
+	if (!PyArg_ParseTuple(args, "llOl:hash", 
+			      &ulSeed, &cchSeed, &a, &cHashElements))
 	  return NULL;
 	if (!PyString_Check(a))
 	{
@@ -19,13 +21,35 @@ static PyObject * hashFunction(PyObject *self, PyObject *args, PyObject *kw)
 	
 	len = a->ob_size;
 	p = (unsigned char *) a->ob_sval;
-	x = lSeed;
+	x = ulSeed;
 	while (--len >= 0)
-		x = (1000003*x) ^ *p++;
+	{
+	    /* (1000003 * x) ^ *p++ 
+  	     * translated to handle > 32 bit longs 
+	     */
+	    x = (0xf4243 * x);
+	    x = x & 0xFFFFFFFF;
+	    x = x ^ *p++;
+	}
 	x ^= a->ob_size + cchSeed;
-	if (x == -1)
+	if (x == 0xFFFFFFFF)
-		x = -2;
+	  x = 0xfffffffe;
-	return PyInt_FromLong(x);
+	if (x & 0x80000000) 
+	{
+	      /* Emulate Python 32-bit signed (2's complement) 
+	       * modulo operation 
+	       */
+	      x = (~x & 0xFFFFFFFF) + 1;
+	      x %= cHashElements;
+	      if (x != 0)
+	      {
+	          x = x + (~cHashElements & 0xFFFFFFFF) + 1;
+	          x = (~x & 0xFFFFFFFF) + 1;
+              }
+	}
+	else
+	  x %= cHashElements;
+	return PyInt_FromLong((long)x);
 }
 
 static PyObject * calcSeed(PyObject *self, PyObject *args, PyObject *kw)
@@ -33,7 +57,7 @@ static PyObject * calcSeed(PyObject *self, PyObject *args, PyObject *kw)
 	PyStringObject *a;
 	register int len;
 	register unsigned char *p;
-	register long x;
+	register unsigned long x;
 
 	if (!PyString_Check(args))
 	{
@@ -45,10 +69,17 @@ static PyObject * calcSeed(PyObject *self, PyObject *args, PyObject *kw)
 	
 	len = a->ob_size;
 	p = (unsigned char *) a->ob_sval;
-	x = *p << 7;
+	x = (*p << 7) & 0xFFFFFFFF;
 	while (--len >= 0)
-		x = (1000003*x) ^ *p++;
+	{
-	return PyInt_FromLong(x);
+	    /* (1000003 * x) ^ *p++ 
+  	     * translated to handle > 32 bit longs 
+	     */
+	    x = (0xf4243 * x);
+	    x = x & 0xFFFFFFFF;
+	    x = x ^ *p++;
+	}
+	return PyInt_FromLong((long)x);
 }
 
 
@@ -68,5 +99,16 @@ void initperfhash(void)
         m = Py_InitModule4("perfhash", hashMethods,
                                            NULL, NULL, PYTHON_API_VERSION);
         if ( m == NULL )
-            Py_FatalError("can't initialize module hashModule");
+            Py_FatalError("can't initialize module perfhash");
 }
+
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