Import irrlicht 1.8.4 release

source/Irrlicht/CMemoryFile.cpp

@@ -0,0 +1,122 @@
+// Copyright (C) 2002-2012 Nikolaus Gebhardt
+// This file is part of the "Irrlicht Engine".
+// For conditions of distribution and use, see copyright notice in irrlicht.h
+
+#include "CMemoryFile.h"
+#include "irrString.h"
+
+namespace irr
+{
+namespace io
+{
+
+
+CMemoryFile::CMemoryFile(void* memory, long len, const io::path& fileName, bool d)
+: Buffer(memory), Len(len), Pos(0), Filename(fileName), deleteMemoryWhenDropped(d)
+{
+	#ifdef _DEBUG
+	setDebugName("CMemoryFile");
+	#endif
+}
+
+
+CMemoryFile::~CMemoryFile()
+{
+	if (deleteMemoryWhenDropped)
+		delete [] (c8*)Buffer;
+}
+
+
+//! returns how much was read
+s32 CMemoryFile::read(void* buffer, u32 sizeToRead)
+{
+	s32 amount = static_cast<s32>(sizeToRead);
+	if (Pos + amount > Len)
+		amount -= Pos + amount - Len;
+
+	if (amount <= 0)
+		return 0;
+
+	c8* p = (c8*)Buffer;
+	memcpy(buffer, p + Pos, amount);
+
+	Pos += amount;
+
+	return amount;
+}
+
+//! returns how much was written
+s32 CMemoryFile::write(const void* buffer, u32 sizeToWrite)
+{
+	s32 amount = static_cast<s32>(sizeToWrite);
+	if (Pos + amount > Len)
+		amount -= Pos + amount - Len;
+
+	if (amount <= 0)
+		return 0;
+
+	c8* p = (c8*)Buffer;
+	memcpy(p + Pos, buffer, amount);
+
+	Pos += amount;
+
+	return amount;
+}
+
+
+
+//! changes position in file, returns true if successful
+//! if relativeMovement==true, the pos is changed relative to current pos,
+//! otherwise from begin of file
+bool CMemoryFile::seek(long finalPos, bool relativeMovement)
+{
+	if (relativeMovement)
+	{
+		if (Pos + finalPos > Len)
+			return false;
+
+		Pos += finalPos;
+	}
+	else
+	{
+		if (finalPos > Len)
+			return false;
+
+		Pos = finalPos;
+	}
+
+	return true;
+}
+
+
+//! returns size of file
+long CMemoryFile::getSize() const
+{
+	return Len;
+}
+
+
+//! returns where in the file we are.
+long CMemoryFile::getPos() const
+{
+	return Pos;
+}
+
+
+//! returns name of file
+const io::path& CMemoryFile::getFileName() const
+{
+	return Filename;
+}
+
+
+IReadFile* createMemoryReadFile(void* memory, long size, const io::path& fileName, bool deleteMemoryWhenDropped)
+{
+	CMemoryFile* file = new CMemoryFile(memory, size, fileName, deleteMemoryWhenDropped);
+	return file;
+}
+
+
+} // end namespace io
+} // end namespace irr
+