Fix some problems when Extract is used more than once.

dlls/cabinet/cabextract.c

@@ -46,6 +46,8 @@ WINE_DEFAULT_DEBUG_CHANNEL(cabinet);
  */
 cab_UBYTE search_buf[CAB_SEARCH_SIZE];
 
+cab_decomp_state decomp_state;
+
 /* all the file IO is abstracted into these routines:
  * cabinet_(open|close|read|seek|skip|getoffset)
  * file_(open|close|write)
@@ -2771,6 +2773,8 @@ BOOL process_cabinet(LPCSTR cabname, LPCSTR dir, BOOL fix, BOOL lower)
   /* has the list-mode header been seen before? */
   int viewhdr = 0;
 
+  ZeroMemory(&decomp_state, sizeof(cab_decomp_state));
+
   TRACE("Extract %s\n", debugstr_a(cabname));
 
   /* load the file requested */

dlls/cabinet/cabinet.h

@@ -269,7 +269,7 @@ struct cabinet {
   cab_UBYTE flags;                     /* header flags                   */
 };
 
-struct {
+typedef struct {
   struct cab_folder *current;      /* current folder we're extracting from  */
   cab_ULONG offset;                /* uncompressed offset within folder     */
   cab_UBYTE *outpos;               /* (high level) start of data to use up  */
@@ -283,7 +283,7 @@ struct {
     struct QTMstate qtm;
     struct LZXstate lzx;
   } methods;
-} decomp_state;
+} cab_decomp_state;
 
 /* from cabextract.c */
 BOOL process_cabinet(LPCSTR cabname, LPCSTR dir, BOOL fix, BOOL lower);