Speed up startup time for movies in split rar archives.

This patch cuts down on the seek time for files in stored rar archives.

1 files changed, 17 insertions, 2 deletions

diff --git a/lib/UnrarXLib/volume.cpp b/lib/UnrarXLib/volume.cpp
index b24e98bd61..1c1d95008a 100644
--- a/lib/UnrarXLib/volume.cpp
+++ b/lib/UnrarXLib/volume.cpp
@@ -20,8 +20,23 @@ bool MergeArchive(Archive &Arc,ComprDataIO *DataIO,bool ShowFileName,char Comman
   Arc.Close();
 
   char NextName[NM];
-  strcpy(NextName,Arc.FileName);
-  NextVolumeName(NextName,(Arc.NewMhd.Flags & MHD_NEWNUMBERING)==0 || Arc.OldFormat);
+  if(DataIO != NULL && (DataIO->m_iSeekTo > Arc.NewLhd.FullPackSize)){
+    if (Arc.Volume && Arc.NotFirstVolume)
+      VolNameToFirstName(Arc.FileName,NextName,(Arc.NewMhd.Flags & MHD_NEWNUMBERING));
+    else
+      strcpy(NextName,Arc.FileName);
+
+    Int64 FastSeek = 0;
+    while(FastSeek+Arc.NewLhd.FullPackSize < DataIO->m_iSeekTo){
+      NextVolumeName(NextName,(Arc.NewMhd.Flags & MHD_NEWNUMBERING)==0 || Arc.OldFormat);
+      FastSeek += Arc.NewLhd.FullPackSize;
+    }
+    DataIO->CurUnpRead = FastSeek;
+
+  }else{
+    strcpy(NextName,Arc.FileName);
+    NextVolumeName(NextName,(Arc.NewMhd.Flags & MHD_NEWNUMBERING)==0 || Arc.OldFormat);
+  }
 
 #if !defined(SFX_MODULE) && !defined(RARDLL)
   bool RecoveryDone=false;