Replace sqlite3AffinityType() with a slightly faster version. (CVS 2296)

FossilOrigin-Name: abe9f5e81f1196f28eec628e898b2a994c4d659d

manifest

@@ -1,5 +1,5 @@
-C Performance\stweaks\sfor\ssqlite3AffinityType.\s(CVS\s2295)
-D 2005-01-31T23:45:56
+C Replace\ssqlite3AffinityType()\swith\sa\sslightly\sfaster\sversion.\s(CVS\s2296)
+D 2005-02-01T01:21:55
 F Makefile.in ffd81f5e926d40b457071b4de8d7c1fa18f39b5a
 F Makefile.linux-gcc a9e5a0d309fa7c38e7c14d3ecf7690879d3a5457
 F README a01693e454a00cc117967e3f9fdab2d4d52e9bc1
@@ -31,7 +31,7 @@ F src/attach.c f78f76bc6a8e5e487ca53636e21ccba2484a9a61
 F src/auth.c 18c5a0befe20f3a58a41e3ddd78f372faeeefe1f
 F src/btree.c e68ae12c8b12ef9d45d58d931c36c184055a3880
 F src/btree.h 74d19cf40ab49fd69abe9e4e12a6c321ad86c497
-F src/build.c c09954ebeef8d7464305b4b2ff53f7fe193d7ae3
+F src/build.c 7e50cb572eedf50b3f5f499bce7d5340d9b00b63
 F src/cursor.c de73c00aefc4747ad59b5105cf38bbff0667922e
 F src/date.c f3d1f5cd1503dabf426a198f3ebef5afbc122a7f
 F src/delete.c 4b94395b52a8f7785acd71135c2ce54f3f5550b3
@@ -272,7 +272,7 @@ F www/tclsqlite.tcl e73f8f8e5f20e8277619433f7970060ab01088fc
 F www/vdbe.tcl 095f106d93875c94b47367384ebc870517431618
 F www/version3.tcl 092a01f5ef430d2c4acc0ae558d74c4bb89638a0
 F www/whentouse.tcl 3e522a06ad41992023c80ca29a048ae2331ca5bd
-P 5c10ccd8e99cab7e9f8e733dfd1447c2df1d25c1
-R 8e51075895dcc7f3464e186f35d155df
-U drh
-Z 78ca355ac379f133da207d92588fd08c
+P 32b926154aaae9264359fa1e9a7189afd08b0bb7
+R 8e50ba8963e4eb03424af74a3c54cd49
+U danielk1977
+Z e5d48140c00b6d3b721213654c5201c0

manifest.uuid

@@ -1 +1 @@
-32b926154aaae9264359fa1e9a7189afd08b0bb7
+abe9f5e81f1196f28eec628e898b2a994c4d659d

src/build.c

@@ -22,7 +22,7 @@
 **     COMMIT
 **     ROLLBACK
 **
-** $Id: build.c,v 1.304 2005/01/31 23:45:56 drh Exp $
+** $Id: build.c,v 1.305 2005/02/01 01:21:55 danielk1977 Exp $
 */
 #include "sqliteInt.h"
 #include <ctype.h>
@@ -857,37 +857,46 @@ void sqlite3AddNotNull(Parse *pParse, int onError){
 /*
 ** Scan the column type name zType (length nType) and return the
 ** associated affinity type.
+**
+** This routine does a case-independent search of zType for the 
+** substrings in the following table. If one of the substrings is
+** found, the corresponding affinity is returned. If zType contains
+** more than one of the substrings, entries toward the top of 
+** the table take priority. For example, if zType is 'BLOBINT', 
+** SQLITE_AFF_INTEGER is returned.
+**
+** Substring     | Affinity
+** --------------------------------
+** 'INT'         | SQLITE_AFF_INTEGER
+** 'CHAR'        | SQLITE_AFF_TEXT
+** 'CLOB'        | SQLITE_AFF_TEXT
+** 'TEXT'        | SQLITE_AFF_TEXT
+** 'BLOB'        | SQLITE_AFF_NONE
+**
+** If none of the substrings in the above table are found,
+** SQLITE_AFF_NUMERIC is returned.
 */
 static char sqlite3AffinityType(const char *zType, int nType){
-  int n, i;
-  static const struct {
-    const char *zSub;  /* Keywords substring to search for */
-    char nSub;         /* length of zSub */
-    char affinity;     /* Affinity to return if it matches */
-  } substrings[] = {
-    {"INT",  3, SQLITE_AFF_INTEGER},
-    {"CHAR", 4, SQLITE_AFF_TEXT},
-    {"CLOB", 4, SQLITE_AFF_TEXT},
-    {"TEXT", 4, SQLITE_AFF_TEXT},
-    {"BLOB", 4, SQLITE_AFF_NONE},
-  };
+  u32 h = 0;
+  char aff = SQLITE_AFF_NUMERIC;
+  const unsigned char *zIn = zType;
+  const unsigned char *zEnd = (zIn+nType);
 
-  if( nType==0 ){
-    return SQLITE_AFF_NONE;
-  }
-  for(i=0; i<sizeof(substrings)/sizeof(substrings[0]); i++){
-    const char *zSub = substrings[i].zSub;
-    int c1 = tolower(zSub[0]);
-    int len = substrings[i].nSub;
-    int limit = nType - len;
-    const char *z = zType;
-    for(n=0; n<=limit; n++, z++){
-      if( tolower(z[0])==c1 && 0==sqlite3StrNICmp(z, zSub, len) ){
-        return substrings[i].affinity;
-      }
+  while( zIn!=zEnd ){
+    h = (h<<8) + sqlite3UpperToLower[*zIn];
+    zIn++;
+    if     ( h==0x63686172 ) aff = SQLITE_AFF_TEXT;           /* CHAR */
+    else if( h==0x636C6F62 ) aff = SQLITE_AFF_TEXT;           /* CLOB */
+    else if( h==0x74657874 ) aff = SQLITE_AFF_TEXT;           /* TEXT */
+    else if( h==0x626C6F62 && aff==SQLITE_AFF_NUMERIC ){      /* BLOB */
+      aff = SQLITE_AFF_NONE;
+    }else if( (h&0x00FFFFFF)==0x00696E74 ){                   /* INT */
+      aff = SQLITE_AFF_INTEGER; 
+      break;
     }
   }
-  return SQLITE_AFF_NUMERIC;
+
+  return aff;
 }
 
 /*