- moved file system implementation to 'common'.

src/common/filesystem/file_grp.cpp

@@ -0,0 +1,152 @@
+/*
+** file_grp.cpp
+**
+**---------------------------------------------------------------------------
+** Copyright 1998-2009 Randy Heit
+** Copyright 2005-2009 Christoph Oelckers
+** All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions
+** are met:
+**
+** 1. Redistributions of source code must retain the above copyright
+**    notice, this list of conditions and the following disclaimer.
+** 2. Redistributions in binary form must reproduce the above copyright
+**    notice, this list of conditions and the following disclaimer in the
+**    documentation and/or other materials provided with the distribution.
+** 3. The name of the author may not be used to endorse or promote products
+**    derived from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**---------------------------------------------------------------------------
+**
+**
+*/
+
+#include "resourcefile.h"
+#include "printf.h"
+
+//==========================================================================
+//
+//
+//
+//==========================================================================
+
+struct GrpInfo
+{
+	uint32_t		Magic[3];
+	uint32_t		NumLumps;
+};
+
+struct GrpLump
+{
+	union
+	{
+		struct
+		{
+			char		Name[12];
+			uint32_t		Size;
+		};
+		char NameWithZero[13];
+	};
+};
+
+
+//==========================================================================
+//
+// Build GRP file
+//
+//==========================================================================
+
+class FGrpFile : public FUncompressedFile
+{
+public:
+	FGrpFile(const char * filename, FileReader &file);
+	bool Open(bool quiet, LumpFilterInfo* filter);
+};
+
+
+//==========================================================================
+//
+// Initializes a Build GRP file
+//
+//==========================================================================
+
+FGrpFile::FGrpFile(const char *filename, FileReader &file)
+: FUncompressedFile(filename, file)
+{
+}
+
+//==========================================================================
+//
+// Open it
+//
+//==========================================================================
+
+bool FGrpFile::Open(bool quiet, LumpFilterInfo*)
+{
+	GrpInfo header;
+
+	Reader.Read(&header, sizeof(header));
+	NumLumps = LittleLong(header.NumLumps);
+	
+	GrpLump *fileinfo = new GrpLump[NumLumps];
+	Reader.Read (fileinfo, NumLumps * sizeof(GrpLump));
+
+	Lumps.Resize(NumLumps);
+
+	int Position = sizeof(GrpInfo) + NumLumps * sizeof(GrpLump);
+
+	for(uint32_t i = 0; i < NumLumps; i++)
+	{
+		Lumps[i].Owner = this;
+		Lumps[i].Position = Position;
+		Lumps[i].LumpSize = LittleLong(fileinfo[i].Size);
+		Position += fileinfo[i].Size;
+		Lumps[i].Flags = 0;
+		fileinfo[i].NameWithZero[12] = '\0';	// Be sure filename is null-terminated
+		Lumps[i].LumpNameSetup(fileinfo[i].NameWithZero);
+	}
+	GenerateHash();
+	delete[] fileinfo;
+	return true;
+}
+
+
+//==========================================================================
+//
+// File open
+//
+//==========================================================================
+
+FResourceFile *CheckGRP(const char *filename, FileReader &file, bool quiet, LumpFilterInfo* filter)
+{
+	char head[12];
+
+	if (file.GetLength() >= 12)
+	{
+		file.Seek(0, FileReader::SeekSet);
+		file.Read(&head, 12);
+		file.Seek(0, FileReader::SeekSet);
+		if (!memcmp(head, "KenSilverman", 12))
+		{
+			FResourceFile *rf = new FGrpFile(filename, file);
+			if (rf->Open(quiet, filter)) return rf;
+
+			file = std::move(rf->Reader); // to avoid destruction of reader
+			delete rf;
+		}
+	}
+	return NULL;
+}
+