diff -r ea891871f481 -r bb5522e88ab2 misc/libphysfs/lzma/CPP/7zip/Archive/Common/MultiStream.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/misc/libphysfs/lzma/CPP/7zip/Archive/Common/MultiStream.cpp	Mon Apr 10 12:06:43 2017 -0400
@@ -0,0 +1,201 @@
+// MultiStream.cpp
+
+#include "StdAfx.h"
+
+#include "MultiStream.h"
+
+STDMETHODIMP CMultiStream::Read(void *data, UInt32 size, UInt32 *processedSize)
+{
+  if(processedSize != NULL)
+    *processedSize = 0;
+  while(_streamIndex < Streams.Size() && size > 0)
+  {
+    CSubStreamInfo &s = Streams[_streamIndex];
+    if (_pos == s.Size)
+    {
+      _streamIndex++;
+      _pos = 0;
+      continue;
+    }
+    RINOK(s.Stream->Seek(s.Pos + _pos, STREAM_SEEK_SET, 0));
+    UInt32 sizeToRead = UInt32(MyMin((UInt64)size, s.Size - _pos));
+    UInt32 realProcessed;
+    HRESULT result = s.Stream->Read(data, sizeToRead, &realProcessed);
+    data = (void *)((Byte *)data + realProcessed);
+    size -= realProcessed;
+    if(processedSize != NULL)
+      *processedSize += realProcessed;
+    _pos += realProcessed;
+    _seekPos += realProcessed;
+    RINOK(result);
+    break;
+  }
+  return S_OK;
+}
+  
+STDMETHODIMP CMultiStream::Seek(Int64 offset, UInt32 seekOrigin, 
+    UInt64 *newPosition)
+{
+  UInt64 newPos;
+  switch(seekOrigin)
+  {
+    case STREAM_SEEK_SET:
+      newPos = offset;
+      break;
+    case STREAM_SEEK_CUR:
+      newPos = _seekPos + offset;
+      break;
+    case STREAM_SEEK_END:
+      newPos = _totalLength + offset;
+      break;
+    default:
+      return STG_E_INVALIDFUNCTION;
+  }
+  _seekPos = 0;
+  for (_streamIndex = 0; _streamIndex < Streams.Size(); _streamIndex++)
+  {
+    UInt64 size = Streams[_streamIndex].Size;
+    if (newPos < _seekPos + size)
+    {
+      _pos = newPos - _seekPos;
+      _seekPos += _pos;
+      if (newPosition != 0)
+        *newPosition = newPos;
+      return S_OK;
+    }
+    _seekPos += size;
+  }
+  if (newPos == _seekPos)
+  {
+    if (newPosition != 0)
+      *newPosition = newPos;
+    return S_OK;
+  }
+  return E_FAIL;
+}
+
+
+/*
+class COutVolumeStream: 
+  public ISequentialOutStream,
+  public CMyUnknownImp
+{
+  int _volIndex;
+  UInt64 _volSize;
+  UInt64 _curPos;
+  CMyComPtr<ISequentialOutStream> _volumeStream;
+  COutArchive _archive;
+  CCRC _crc;
+
+public:
+  MY_UNKNOWN_IMP
+
+  CFileItem _file;
+  CUpdateOptions _options;
+  CMyComPtr<IArchiveUpdateCallback2> VolumeCallback;
+  void Init(IArchiveUpdateCallback2 *volumeCallback, 
+      const UString &name)  
+  { 
+    _file.Name = name;
+    _file.IsStartPosDefined = true;
+    _file.StartPos = 0;
+    
+    VolumeCallback = volumeCallback;
+    _volIndex = 0;
+    _volSize = 0;
+  }
+  
+  HRESULT Flush();
+  STDMETHOD(Write)(const void *data, UInt32 size, UInt32 *processedSize);
+};
+
+HRESULT COutVolumeStream::Flush()
+{
+  if (_volumeStream)
+  {
+    _file.UnPackSize = _curPos;
+    _file.FileCRC = _crc.GetDigest();
+    RINOK(WriteVolumeHeader(_archive, _file, _options));
+    _archive.Close();
+    _volumeStream.Release();
+    _file.StartPos += _file.UnPackSize;
+  }
+  return S_OK;
+}
+*/
+
+/*
+STDMETHODIMP COutMultiStream::Write(const void *data, UInt32 size, UInt32 *processedSize)
+{
+  if(processedSize != NULL)
+    *processedSize = 0;
+  while(size > 0)
+  {
+    if (_streamIndex >= Streams.Size())
+    {
+      CSubStreamInfo subStream;
+      RINOK(VolumeCallback->GetVolumeSize(Streams.Size(), &subStream.Size));
+      RINOK(VolumeCallback->GetVolumeStream(Streams.Size(), &subStream.Stream));
+      subStream.Pos = 0;
+      Streams.Add(subStream);
+      continue;
+    }
+    CSubStreamInfo &subStream = Streams[_streamIndex];
+    if (_offsetPos >= subStream.Size)
+    {
+      _offsetPos -= subStream.Size;
+      _streamIndex++;
+      continue;
+    }
+    if (_offsetPos != subStream.Pos)
+    {
+      CMyComPtr<IOutStream> outStream;
+      RINOK(subStream.Stream.QueryInterface(IID_IOutStream, &outStream));
+      RINOK(outStream->Seek(_offsetPos, STREAM_SEEK_SET, NULL));
+      subStream.Pos = _offsetPos;
+    }
+
+    UInt32 curSize = (UInt32)MyMin((UInt64)size, subStream.Size - subStream.Pos);
+    UInt32 realProcessed;
+    RINOK(subStream.Stream->Write(data, curSize, &realProcessed));
+    data = (void *)((Byte *)data + realProcessed);
+    size -= realProcessed;
+    subStream.Pos += realProcessed;
+    _offsetPos += realProcessed;
+    _absPos += realProcessed;
+    if (_absPos > _length)
+      _length = _absPos;
+    if(processedSize != NULL)
+      *processedSize += realProcessed;
+    if (subStream.Pos == subStream.Size)
+    {
+      _streamIndex++;
+      _offsetPos = 0;
+    }
+    if (realProcessed != curSize && realProcessed == 0)
+      return E_FAIL;
+  }
+  return S_OK;
+}
+
+STDMETHODIMP COutMultiStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64 *newPosition)
+{
+  if(seekOrigin >= 3)
+    return STG_E_INVALIDFUNCTION;
+  switch(seekOrigin)
+  {
+    case STREAM_SEEK_SET:
+      _absPos = offset;
+      break;
+    case STREAM_SEEK_CUR:
+      _absPos += offset;
+      break;
+    case STREAM_SEEK_END:
+      _absPos = _length + offset;
+      break;
+  }
+  _offsetPos = _absPos;
+  _streamIndex = 0;
+  return S_OK;
+}
+*/