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//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2005-2014 Simon Howard
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// DESCRIPTION:
// WAD I/O functions.
//
#include <stdio.h>
#include "config.h"
#include "doomtype.h"
#include "m_argv.h"
#include "w_file.h"
extern wad_file_class_t stdc_wad_file;
#ifdef _WIN32
extern wad_file_class_t win32_wad_file;
#endif
#ifdef HAVE_MMAP
extern wad_file_class_t posix_wad_file;
#endif
static wad_file_class_t *wad_file_classes[] =
{
#ifdef _WIN32
&win32_wad_file,
#endif
#ifdef HAVE_MMAP
&posix_wad_file,
#endif
&stdc_wad_file,
};
wad_file_t *W_OpenFile(char *path)
{
wad_file_t *result;
int i;
//!
// Use the OS's virtual memory subsystem to map WAD files
// directly into memory.
//
if (!M_CheckParm("-mmap"))
{
return stdc_wad_file.OpenFile(path);
}
// Try all classes in order until we find one that works
result = NULL;
for (i=0; i<arrlen(wad_file_classes); ++i)
{
result = wad_file_classes[i]->OpenFile(path);
if (result != NULL)
{
break;
}
}
return result;
}
void W_CloseFile(wad_file_t *wad)
{
wad->file_class->CloseFile(wad);
}
size_t W_Read(wad_file_t *wad, unsigned int offset,
void *buffer, size_t buffer_len)
{
return wad->file_class->Read(wad, offset, buffer, buffer_len);
}
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