Fixed the GetChanges detection and added FilterType decoding

ActiveSync/NSDate+ActiveSync.h

@@ -36,6 +36,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 @interface NSDate (ActiveSync)
 
++ (NSDate *) dateFromFilterType: (NSString *) theFilterType;
 - (NSString *) activeSyncRepresentation;
 
 @end

ActiveSync/NSDate+ActiveSync.m

@@ -32,8 +32,58 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #import <Foundation/NSString.h>
 #import <Foundation/NSTimeZone.h>
 
+#define ONE_DAY 86400
+
 @implementation NSDate (ActiveSync)
 
+//
+// See http://msdn.microsoft.com/en-us/library/gg709713(v=exchg.80).aspx for available types
+//
++ (NSDate *) dateFromFilterType: (NSString *) theFilterType
+{
+  NSDate *d;
+
+  d = [self alloc];
+
+  if (d)
+    {
+      int value;
+      
+      switch ([theFilterType intValue])
+        {
+        case 1:
+          value = ONE_DAY;
+          break;
+        case 2:
+          value = 3 * ONE_DAY;
+          break;
+        case 3:
+          value = 7 * ONE_DAY;
+          break;
+        case 4:
+          value = 14 * ONE_DAY;
+          break;
+        case 5:
+          value = 30 * ONE_DAY;
+          break;
+        case 6:
+          value = 90 * ONE_DAY;
+          break;
+        case 7:
+          value = 180 * ONE_DAY;
+          break;
+        case 0:
+        case 8:
+        default:
+          return nil;
+        }
+
+      return [d initWithTimeIntervalSinceNow: -value];
+    }
+
+  return d;
+}
+
 - (NSString *) activeSyncRepresentation
 {
   return [self descriptionWithCalendarFormat: @"%Y%m%dT%H%M%SZ"  timeZone: [NSTimeZone timeZoneWithName: @"GMT"]  locale: nil];

ActiveSync/SOGoActiveSyncDispatcher+Sync.m

@@ -98,6 +98,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "iCalToDo+ActiveSync.h"
 #include "NGDOMElement+ActiveSync.h"
 #include "NGVCard+ActiveSync.h"
+#include "NSDate+ActiveSync.h"
 #include "NSData+ActiveSync.h"
 #include "NSString+ActiveSync.h"
 #include "SOGoActiveSyncConstants.h"
@@ -445,7 +446,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 - (void) processSyncGetChanges: (id <DOMElement>) theDocumentElement
                   inCollection: (id) theCollection
                    withSyncKey: (NSString *) theSyncKey
-                      withType: (SOGoMicrosoftActiveSyncFolderType) theFolderType
+                withFolderType: (SOGoMicrosoftActiveSyncFolderType) theFolderType
+                withFilterType: (NSDate *) theFilterType
                       inBuffer: (NSMutableString *) theBuffer
 {
   int i;
@@ -743,9 +745,9 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   value = [theDocumentElement getElementsByTagName: @"GetChanges"];
   getChanges = YES;
 
-  if ([value count])
+  if ([value count] && [[[value lastObject] textValue] length])
     getChanges = [[[value lastObject] textValue] boolValue];
-
+                  
   first_sync = NO;
 
   if ([syncKey isEqualToString: @"0"])
@@ -776,7 +778,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
       [self processSyncGetChanges: theDocumentElement
                      inCollection: collection
                       withSyncKey: syncKey
-                         withType: folderType
+                   withFolderType: folderType
+                   withFilterType: [NSDate dateFromFilterType: [[(id)[theDocumentElement getElementsByTagName: @"FilterType"] lastObject] textValue]]
                          inBuffer: theBuffer];
     }