Addresses #1032

Replaced windows portability functions with better (native) windows calls

git-svn-id: file:///svn/toku/tokudb.1032b@8297 c7de825b-a66e-492c-adef-691d508d4ae1

windows/files.c

@@ -37,19 +37,7 @@ fsync(int fd) {
 
 int 
 ftruncate(int fd, int64_t offset) {
-    HANDLE h;
-    BOOL b;
-    int r;
-
-    h = (HANDLE) _get_osfhandle(fd);
-    if (h == INVALID_HANDLE_VALUE)
-        return -1;
-    r = _lseeki64(fd, 0, SEEK_SET);
-    if (r != 0)
-        return -2;
-    b = SetEndOfFile(h);
-    if (!b)
-        return -3;
-    return 0;
+    int r = _chsize_s(fd, offset);
+    return r;
 }
 

windows/windows.c

@@ -22,11 +22,13 @@
 
 
 int
-toku_os_get_file_size(int fildes, int64_t *size) {
-    struct _stat64 sbuf;
-    int r = _fstati64(fildes, &sbuf);
-    if (r==0) {
-        *size = sbuf.st_size;
+toku_os_get_file_size(int fildes, int64_t *sizep) {
+    int r;
+    int64_t size = _filelengthi64(fildes);
+    if (size<0) r = errno;
+    else {
+        r = 0;
+        *sizep = size;
     }
     return r;
 }