1 files changed, 70 insertions, 0 deletions
diff --git a/libs/archive/src/inputstream.cpp b/libs/archive/src/inputstream.cpp
new file mode 100644
index 0000000..b44986a
--- /dev/null
+++ b/libs/archive/src/inputstream.cpp
@@ -0,0 +1,70 @@
+/*
+Mod Organizer archive handling
+
+Copyright (C) 2012 Sebastian Herbord, 2020 MO2 Team. All rights reserved.
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include "inputstream.h"
+#include "compat.h"
+
+static inline HRESULT ConvertBoolToHRESULT(bool result)
+{
+  if (result) {
+    return S_OK;
+  }
+  DWORD lastError = ::GetLastError();
+  if (lastError == 0) {
+    return E_FAIL;
+  }
+  return HRESULT_FROM_WIN32(lastError);
+}
+
+InputStream::InputStream() {}
+
+InputStream::~InputStream() {}
+
+bool InputStream::Open(std::filesystem::path const& filename)
+{
+  return m_File.Open(filename);
+}
+
+STDMETHODIMP InputStream::Read(void* data, UInt32 size, UInt32* processedSize) throw()
+{
+  UInt32 realProcessedSize;
+  bool result = m_File.Read(data, size, realProcessedSize);
+
+  if (processedSize != nullptr) {
+    *processedSize = realProcessedSize;
+  }
+
+  if (result) {
+    return S_OK;
+  }
+
+  return HRESULT_FROM_WIN32(::GetLastError());
+}
+
+STDMETHODIMP InputStream::Seek(Int64 offset, UInt32 seekOrigin, UInt64* newPosition) throw()
+{
+  UInt64 realNewPosition = offset;
+  bool result            = m_File.Seek(offset, seekOrigin, realNewPosition);
+
+  if (newPosition) {
+    *newPosition = realNewPosition;
+  }
+  return ConvertBoolToHRESULT(result);
+}