1 files changed, 79 insertions, 0 deletions
diff --git a/CPP/7zip/Archive/Rar/RarVolumeInStream.cpp b/CPP/7zip/Archive/Rar/RarVolumeInStream.cpp
new file mode 100755
index 00000000..32078e6d
--- /dev/null
+++ b/CPP/7zip/Archive/Rar/RarVolumeInStream.cpp
@@ -0,0 +1,79 @@
+// RarVolumeInStream.cpp
+
+#include "StdAfx.h"
+
+#include "RarVolumeInStream.h"
+
+#include "Windows/Defs.h"
+#include "Common/Defs.h"
+
+namespace NArchive {
+namespace NRar {
+
+void CFolderInStream::Init(
+    CObjectVector<CInArchive> *archives, 
+    const CObjectVector<CItemEx> *items,
+    const CRefItem &refItem)
+{
+  _archives = archives;
+  _items = items;
+  _refItem = refItem;
+  _curIndex = 0;
+  CRCs.Clear();
+  _fileIsOpen = false;
+}
+
+HRESULT CFolderInStream::OpenStream()
+{
+  while (_curIndex < _refItem.NumItems)
+  {
+    const CItemEx &item = (*_items)[_refItem.ItemIndex + _curIndex];
+    _stream.Attach((*_archives)[_refItem.VolumeIndex + _curIndex].
+        CreateLimitedStream(item.GetDataPosition(), item.PackSize));
+    _curIndex++;
+    _fileIsOpen = true;
+    _crc.Init();
+    return S_OK;
+  }
+  return S_OK;
+}
+
+HRESULT CFolderInStream::CloseStream()
+{
+  CRCs.Add(_crc.GetDigest());
+  _stream.Release();
+  _fileIsOpen = false;
+  return S_OK;
+}
+
+STDMETHODIMP CFolderInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
+{
+  UInt32 realProcessedSize = 0;
+  while ((_curIndex < _refItem.NumItems || _fileIsOpen) && size > 0)
+  {
+    if (_fileIsOpen)
+    {
+      UInt32 localProcessedSize;
+      RINOK(_stream->Read(
+          ((Byte *)data) + realProcessedSize, size, &localProcessedSize));
+      _crc.Update(((Byte *)data) + realProcessedSize, localProcessedSize);
+      if (localProcessedSize == 0)
+      {
+        RINOK(CloseStream());
+        continue;
+      }
+      realProcessedSize += localProcessedSize;
+      size -= localProcessedSize;
+      break;
+    }
+    else
+    {
+      RINOK(OpenStream());
+    }
+  }
+  if (processedSize != 0)
+    *processedSize = realProcessedSize;
+  return S_OK;
+}
+
+}}