Initial community commit

Src/external_dependencies/openmpt-trunk/unarchiver/unancient.cpp

@@ -0,0 +1,83 @@
+/*
+ * unancient.cpp
+ * -------------
+ * Purpose: Implementation file for extracting modules from compressed files supported by libancient
+ * Notes  : (currently none)
+ * Authors: OpenMPT Devs
+ * The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
+ */
+
+#include "stdafx.h"
+#include "unancient.h"
+
+#ifdef MPT_WITH_ANCIENT
+#include <ancient/ancient.hpp>
+#endif // MPT_WITH_ANCIENT
+
+
+OPENMPT_NAMESPACE_BEGIN
+
+
+#ifdef MPT_WITH_ANCIENT
+
+
+CAncientArchive::CAncientArchive(FileReader &file)
+	: ArchiveBase(file)
+{
+	inFile.Rewind();
+	try
+	{
+		auto dataView = inFile.GetPinnedView();
+		if(!ancient::Decompressor::detect(mpt::byte_cast<const std::uint8_t*>(dataView.data()), dataView.size()))
+		{
+			return;
+		}
+		ancient::Decompressor decompressor{mpt::byte_cast<const std::uint8_t*>(dataView.data()), dataView.size(), true, true};
+		if(decompressor.getImageSize() || decompressor.getImageOffset())
+		{
+			// skip disk images
+			return;
+		}
+		ArchiveFileInfo fileInfo;
+		fileInfo.name = inFile.GetOptionalFileName().value_or(P_(""));
+		fileInfo.type = ArchiveFileType::Normal;
+		fileInfo.size = decompressor.getRawSize().value_or(0);
+		contents.push_back(fileInfo);
+	} catch(const ancient::Error &)
+	{
+		return;
+	}
+}
+
+
+CAncientArchive::~CAncientArchive()
+{
+	return;
+}
+
+
+bool CAncientArchive::ExtractFile(std::size_t index)
+{
+	if(index >= contents.size())
+	{
+		return false;
+	}
+	data.clear();
+	inFile.Rewind();
+	try
+	{
+		auto dataView = inFile.GetPinnedView();
+		ancient::Decompressor decompressor{mpt::byte_cast<const std::uint8_t*>(dataView.data()), dataView.size(), true, true};
+		data = mpt::buffer_cast<std::vector<char>>(decompressor.decompress(true));
+	} catch (const ancient::Error &)
+	{
+		return false;
+	}
+	return (data.size() > 0);
+}
+
+
+#endif // MPT_WITH_ANCIENT
+
+
+OPENMPT_NAMESPACE_END