forked from mirror/openmw-tes3mp
75d5ad8882
git-svn-id: https://openmw.svn.sourceforge.net/svnroot/openmw/trunk@117 ea6a568a-9f4f-0410-981a-c910a81bb256
69 lines
1.9 KiB
D
69 lines
1.9 KiB
D
/*
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OpenMW - The completely unofficial reimplementation of Morrowind
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Copyright (C) 2008-2009 Nicolay Korslund
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Email: < korslund@gmail.com >
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WWW: http://openmw.sourceforge.net/
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This file (c_mmfile.d) is part of the OpenMW package.
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OpenMW is distributed as free software: you can redistribute it
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and/or modify it under the terms of the GNU General Public License
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version 3, as published by the Free Software Foundation.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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version 3 along with this program. If not, see
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http://www.gnu.org/licenses/ .
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*/
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/*
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This file provides a simple interface to memory mapped files
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through C functions. Since D's MmFile is superior in terms of
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usability and platform independence, we use it even for C++ code.
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*/
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module util.c_mmfile;
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import std.mmfile;
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import std.string;
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version(Windows)
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static int pageSize = 64*1024;
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else
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static int pageSize = 4*1024;
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// List of all MMFs in existence, to keep the GC from killing them
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int[MmFile] mf_list;
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extern(C):
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// Open a new memory mapped file
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MmFile mmf_open(char *fileName)
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{
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auto mmf = new MmFile(toString(fileName),
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MmFile.Mode.Read,
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0, null, pageSize);
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mf_list[mmf] = 1;
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return mmf;
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}
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// Close a file. Do not use the handle after calling this function, as
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// the object gets deleted
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void mmf_close(MmFile mmf)
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{
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mf_list.remove(mmf);
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delete mmf;
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}
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// Map a region of the file. Do NOT attempt to access several regions
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// at once. Map will almost always unmap the current mapping (thus
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// making all current pointers invalid) when a new map is requested.
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void* mmf_map(MmFile mmf, ulong offset, ulong size)
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{
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return mmf[offset..offset+size].ptr;
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}
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