preparations for getting rid of FZipLump

* allow ancient compression algorithms to be handled by OpenDecompressor.
* move FCompressedBuffer to fs_files.h
* use a mutex lock for 7z access because it cannot be made thread save otherwise.

src/common/filesystem/source/critsec.cpp

@@ -0,0 +1,150 @@
+/*
+**
+**
+**---------------------------------------------------------------------------
+** Copyright 2005-2016 Randy Heit
+** 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.
+**---------------------------------------------------------------------------
+**
+*/
+
+namespace FileSys {
+
+#ifdef _WIN32
+
+#ifndef _WINNT_
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+class FInternalCriticalSection
+{
+public:
+	void Enter()
+	{
+		AcquireSRWLockExclusive(&CritSec);
+	}
+	void Leave()
+	{
+		ReleaseSRWLockExclusive(&CritSec);
+	}
+private:
+	SRWLOCK CritSec = SRWLOCK_INIT;
+};
+
+
+FInternalCriticalSection *CreateCriticalSection()
+{
+	return new FInternalCriticalSection();
+}
+
+void DeleteCriticalSection(FInternalCriticalSection *c)
+{
+	delete c;
+}
+
+void EnterCriticalSection(FInternalCriticalSection *c)
+{
+	c->Enter();
+}
+
+void LeaveCriticalSection(FInternalCriticalSection *c)
+{
+	c->Leave();
+}
+
+#else
+
+#include "critsec.h"
+
+#include <pthread.h>
+
+class FInternalCriticalSection
+{
+public:
+	FInternalCriticalSection();
+	~FInternalCriticalSection();
+
+	void Enter();
+	void Leave();
+
+private:
+	pthread_mutex_t m_mutex;
+
+};
+
+// TODO: add error handling
+
+FInternalCriticalSection::FInternalCriticalSection()
+{
+	pthread_mutexattr_t attributes;
+	pthread_mutexattr_init(&attributes);
+	pthread_mutexattr_settype(&attributes, PTHREAD_MUTEX_RECURSIVE);
+
+	pthread_mutex_init(&m_mutex, &attributes);
+
+	pthread_mutexattr_destroy(&attributes);
+}
+
+FInternalCriticalSection::~FInternalCriticalSection()
+{
+	pthread_mutex_destroy(&m_mutex);
+}
+
+void FInternalCriticalSection::Enter()
+{
+	pthread_mutex_lock(&m_mutex);
+}
+
+void FInternalCriticalSection::Leave()
+{
+	pthread_mutex_unlock(&m_mutex);
+}
+
+
+FInternalCriticalSection *CreateCriticalSection()
+{
+	return new FInternalCriticalSection();
+}
+
+void DeleteCriticalSection(FInternalCriticalSection *c)
+{
+	delete c;
+}
+
+void EnterCriticalSection(FInternalCriticalSection *c)
+{
+	c->Enter();
+}
+
+void LeaveCriticalSection(FInternalCriticalSection *c)
+{
+	c->Leave();
+} 
+
+#endif
+
+}