Modify the VFS xAccess() method on winNT so that it returns false for

an exists test of a zero-length file.  This makes the windows VFS work
the same as the unix VFS.

FossilOrigin-Name: ec35f25403744f7441ac5ae1486b84d8ebc13e98

manifest

@@ -1,5 +1,8 @@
-C Simplify\sthe\sprevious\scommit\sby\sremoving\sthe\spagerCheckForOrDeleteWAL()\swrapper.
-D 2010-07-05T19:13:26
+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA1
+
+C Modify\sthe\sVFS\sxAccess()\smethod\son\swinNT\sso\sthat\sit\sreturns\sfalse\sfor\nan\sexists\stest\sof\sa\szero-length\sfile.\s\sThis\smakes\sthe\swindows\sVFS\swork\nthe\ssame\sas\sthe\sunix\sVFS.
+D 2010-07-05T21:00:43
 F Makefile.arm-wince-mingw32ce-gcc fcd5e9cd67fe88836360bb4f9ef4cb7f8e2fb5a0
 F Makefile.in a5cad1f8f3e021356bfcc6c77dc16f6f1952bbc3
 F Makefile.linux-gcc d53183f4aa6a9192d249731c90dbdffbd2c68654
@@ -155,7 +158,7 @@ F src/os.h d7775504a51e6e0d40315aa427b3e229ff9ff9ca
 F src/os_common.h a8f95b81eca8a1ab8593d23e94f8a35f35d4078f
 F src/os_os2.c 665876d5eec7585226b0a1cf5e18098de2b2da19
 F src/os_unix.c c6112f0ae34f23ae5ca0189a685e084befbdcf26
-F src/os_win.c 883caa09d8cf7c4dfdef6eba6930466cb8a8275c
+F src/os_win.c bdc058198ca969bcf745835e7ca5fadfeb2a51eb
 F src/pager.c 311571e62fe6a039d2a8dddea830981a6052239a
 F src/pager.h 879fdde5a102d2f21a3135d6f647530b21c2796c
 F src/parse.y ace5c7a125d9f2a410e431ee3209034105045f7e
@@ -830,7 +833,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P 3053a4ad15343a56efa430503797b77bb6d1e770
-R 1ec303291d035dc0b39644c087426f86
-U dan
-Z 86c196ef09ff127a40f174a4579ff6fc
+P a1324d125e2dd7004eaf8680f5f832ef17285087
+R b7b5ca572f0c4cfc846cea3094607313
+U drh
+Z 13fb6b591c3748fd040ab5e5168b969e
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manifest.uuid

@@ -1 +1 @@
-a1324d125e2dd7004eaf8680f5f832ef17285087
+ec35f25403744f7441ac5ae1486b84d8ebc13e98

src/os_win.c

@@ -2078,7 +2078,17 @@ static int winAccess(
     return SQLITE_NOMEM;
   }
   if( isNT() ){
-    attr = GetFileAttributesW((WCHAR*)zConverted);
+    WIN32_FILE_ATTRIBUTE_DATA sAttrData;
+    memset(&sAttrData, 0, sizeof(sAttrData));
+    attr = GetFileAttributesExW((WCHAR*)zConverted,
+                               GetFileExInfoStandard, &sAttrData);
+    /* For an SQLITE_ACCESS_EXISTS query, treat a zero-length file
+    ** as if it does not exist.
+    */
+    if( flags==SQLITE_ACCESS_EXISTS && attr!=INVALID_FILE_ATTRIBUTES
+        && sAttrData.nFileSizeHigh==0 && sAttrData.nFileSizeLow==0 ){
+            attr = INVALID_FILE_ATTRIBUTES;
+    }
 /* isNT() is 1 if SQLITE_OS_WINCE==1, so this else is never executed. 
 ** Since the ASCII version of these Windows API do not exist for WINCE,
 ** it's important to not reference them for WINCE builds.