- put the entire filesystem code into a namespace and created some subdirectories.

src/common/filesystem/source/file_ssi.cpp

@@ -0,0 +1,157 @@
+/*
+** file_grp.cpp
+**
+**---------------------------------------------------------------------------
+** Copyright 1998-2009 Randy Heit
+** Copyright 2005-2020 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"
+
+namespace FileSys {
+//==========================================================================
+//
+// Build GRP file
+//
+//==========================================================================
+
+class FSSIFile : public FUncompressedFile
+{
+public:
+	FSSIFile(const char * filename, FileReader &file, StringPool* sp);
+	bool Open(int version, int lumpcount, LumpFilterInfo* filter);
+};
+
+
+//==========================================================================
+//
+// Initializes a Build GRP file
+//
+//==========================================================================
+
+FSSIFile::FSSIFile(const char *filename, FileReader &file, StringPool* sp)
+: FUncompressedFile(filename, file, sp)
+{
+}
+
+//==========================================================================
+//
+// Open it
+// Note that SSIs can contain embedded GRPs which must be flagged accordingly.
+//
+//==========================================================================
+
+bool FSSIFile::Open(int version, int lumpcount, LumpFilterInfo*)
+{
+	NumLumps = lumpcount*2;
+	Lumps.Resize(lumpcount*2);
+
+
+	int32_t j = (version == 2 ? 267 : 254) + (lumpcount * 121);
+	for (uint32_t i = 0; i < NumLumps; i+=2)
+	{
+		char fn[13];
+		int strlength = Reader.ReadUInt8();
+		if (strlength > 12) strlength = 12;
+
+		Reader.Read(fn, 12);
+		fn[strlength] = 0;
+		int flength = Reader.ReadInt32();
+
+
+		Lumps[i].LumpNameSetup(fn, stringpool);
+		Lumps[i].Position = j;
+		Lumps[i].LumpSize = flength;
+		Lumps[i].Owner = this;
+		if (strstr(fn, ".GRP")) Lumps[i].Flags |= LUMPF_EMBEDDED;
+
+		// SSI files can swap the order of the extension's characters - but there's no reliable detection for this and it can be mixed inside the same container, 
+		// so we have no choice but to create another file record for the altered name.
+		std::swap(fn[strlength - 1], fn[strlength - 3]);
+		Lumps[i+1].LumpNameSetup(fn, stringpool);
+		Lumps[i+1].Position = j;
+		Lumps[i+1].LumpSize = flength;
+		Lumps[i+1].Owner = this;
+		if (strstr(fn, ".GRP")) Lumps[i+1].Flags |= LUMPF_EMBEDDED;
+
+		j += flength;
+
+		Reader.Seek(104, FileReader::SeekCur);
+	}
+	return true;
+}
+
+
+//==========================================================================
+//
+// File open
+//
+//==========================================================================
+
+FResourceFile* CheckSSI(const char* filename, FileReader& file, LumpFilterInfo* filter, FileSystemMessageFunc Printf, StringPool* sp)
+{
+	char zerobuf[72];
+	char buf[72];
+	memset(zerobuf, 0, 72);
+
+	auto skipstring = [&](size_t length)
+	{
+		size_t strlength = file.ReadUInt8();
+		if (strlength > length) return false;
+		size_t count = file.Read(buf, length);
+		buf[length] = 0;
+		if (count != length || strlen(buf) != strlength) return false;
+		if (length != strlength && memcmp(buf + strlength, zerobuf, length - strlength)) return false;
+		return true;
+	};
+	if (file.GetLength() >= 12)
+	{
+		// check if SSI
+		// this performs several checks because there is no "SSI" magic
+		int version = file.ReadInt32();
+		if (version == 1 || version == 2) // if
+		{
+			int numfiles = file.ReadInt32();
+			if (!skipstring(32)) return nullptr;
+			if (version == 2 && !skipstring(12)) return nullptr;
+			for (int i = 0; i < 3; i++)
+			{
+				if (!skipstring(70)) return nullptr;
+			}
+			auto ssi = new FSSIFile(filename, file, sp);
+			if (ssi->Open(version, numfiles, filter)) return ssi;
+			file = std::move(ssi->Reader); // to avoid destruction of reader
+			delete ssi;
+		}
+	}
+	return nullptr;
+}
+
+}