--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/Archive/7z/7zFolderInStream.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,130 @@
+// 7zFolderInStream.cpp
+
+#include "StdAfx.h"
+
+#include "7zFolderInStream.h"
+
+namespace NArchive {
+namespace N7z {
+
+CFolderInStream::CFolderInStream()
+{
+  _inStreamWithHashSpec = new CSequentialInStreamWithCRC;
+  _inStreamWithHash = _inStreamWithHashSpec;
+}
+
+void CFolderInStream::Init(IArchiveUpdateCallback *updateCallback, 
+    const UInt32 *fileIndices, UInt32 numFiles)
+{
+  _updateCallback = updateCallback;
+  _numFiles = numFiles;
+  _fileIndex = 0;
+  _fileIndices = fileIndices;
+  Processed.Clear();
+  CRCs.Clear();
+  Sizes.Clear();
+  _fileIsOpen = false;
+  _currentSizeIsDefined = false;
+}
+
+HRESULT CFolderInStream::OpenStream()
+{
+  _filePos = 0;
+  while (_fileIndex < _numFiles)
+  {
+    _currentSizeIsDefined = false;
+    CMyComPtr<ISequentialInStream> stream;
+    HRESULT result = _updateCallback->GetStream(_fileIndices[_fileIndex], &stream);
+    if (result != S_OK && result != S_FALSE)
+      return result;
+    _fileIndex++;
+    _inStreamWithHashSpec->SetStream(stream);
+    _inStreamWithHashSpec->Init();
+    if (!stream)
+    {
+      RINOK(_updateCallback->SetOperationResult(NArchive::NUpdate::NOperationResult::kOK));
+      Sizes.Add(0);
+      Processed.Add(result == S_OK);
+      AddDigest();
+      continue;
+    }
+    CMyComPtr<IStreamGetSize> streamGetSize;
+    if (stream.QueryInterface(IID_IStreamGetSize, &streamGetSize) == S_OK)
+    {
+      if(streamGetSize)
+      {
+        _currentSizeIsDefined = true;
+        RINOK(streamGetSize->GetSize(&_currentSize));
+      }
+    }
+
+    _fileIsOpen = true;
+    return S_OK;
+  }
+  return S_OK;
+}
+
+void CFolderInStream::AddDigest()
+{
+  CRCs.Add(_inStreamWithHashSpec->GetCRC());
+}
+
+HRESULT CFolderInStream::CloseStream()
+{
+  RINOK(_updateCallback->SetOperationResult(NArchive::NUpdate::NOperationResult::kOK));
+  _inStreamWithHashSpec->ReleaseStream();
+  _fileIsOpen = false;
+  Processed.Add(true);
+  Sizes.Add(_filePos);
+  AddDigest();
+  return S_OK;
+}
+
+STDMETHODIMP CFolderInStream::Read(void *data, UInt32 size, UInt32 *processedSize)
+{
+  UInt32 realProcessedSize = 0;
+  while ((_fileIndex < _numFiles || _fileIsOpen) && size > 0)
+  {
+    if (_fileIsOpen)
+    {
+      UInt32 localProcessedSize;
+      RINOK(_inStreamWithHash->Read(
+          ((Byte *)data) + realProcessedSize, size, &localProcessedSize));
+      if (localProcessedSize == 0)
+      {
+        RINOK(CloseStream());
+        continue;
+      }
+      realProcessedSize += localProcessedSize;
+      _filePos += localProcessedSize;
+      size -= localProcessedSize;
+      break;
+    }
+    else
+    {
+      RINOK(OpenStream());
+    }
+  }
+  if (processedSize != 0)
+    *processedSize = realProcessedSize;
+  return S_OK;
+}
+
+STDMETHODIMP CFolderInStream::GetSubStreamSize(UInt64 subStream, UInt64 *value)
+{
+  *value = 0;
+  int subStreamIndex = (int)subStream;
+  if (subStreamIndex < 0 || subStream > Sizes.Size())
+    return E_FAIL;
+  if (subStreamIndex < Sizes.Size())
+  {
+    *value= Sizes[subStreamIndex];
+    return S_OK;
+  }
+  if (!_currentSizeIsDefined)
+    return S_FALSE;
+  *value = _currentSize;
+  return S_OK;
+}
+
+}}