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// Emacs style mode select -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright(C) 1993-1996 Id Software, Inc.
// Copyright(C) 2008 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.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
// 02111-1307, USA.
//
// DESCRIPTION:
// WAD I/O functions.
//
//-----------------------------------------------------------------------------
#include "config.h"
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "i_system.h"
#include "w_file.h"
#include "z_zone.h"
// This constant doesn't exist in VC6:
#ifndef INVALID_SET_FILE_POINTER
#define INVALID_SET_FILE_POINTER 0xffffffff
#endif
typedef struct
{
wad_file_t wad;
HANDLE handle;
HANDLE handle_map;
} win32_wad_file_t;
extern wad_file_class_t win32_wad_file;
static void MapFile(win32_wad_file_t *wad, char *filename)
{
wad->handle_map = CreateFileMapping(wad->handle,
NULL,
PAGE_WRITECOPY,
0,
0,
NULL);
if (wad->handle_map == NULL)
{
fprintf(stderr, "W_Win32_OpenFile: Unable to CreateFileMapping() "
"for %s\n", filename);
return;
}
wad->wad.mapped = MapViewOfFile(wad->handle_map,
FILE_MAP_COPY,
0, 0, 0);
if (wad->wad.mapped == NULL)
{
fprintf(stderr, "W_Win32_OpenFile: Unable to MapViewOfFile() for %s\n",
filename);
}
}
unsigned int GetFileLength(HANDLE handle)
{
DWORD result;
result = SetFilePointer(handle, 0, NULL, FILE_END);
if (result == INVALID_SET_FILE_POINTER)
{
I_Error("W_Win32_OpenFile: Failed to read file length");
}
return result;
}
static wad_file_t *W_Win32_OpenFile(char *path)
{
win32_wad_file_t *result;
HANDLE handle;
OFSTRUCT fileinfo;
handle = (HANDLE) OpenFile(path, &fileinfo, OF_READ);
if (handle == (HANDLE) HFILE_ERROR)
{
return NULL;
}
// Create a new win32_wad_file_t to hold the file handle.
result = Z_Malloc(sizeof(win32_wad_file_t), PU_STATIC, 0);
result->wad.file_class = &win32_wad_file;
result->wad.length = GetFileLength(handle);
result->handle = handle;
// Try to map the file into memory with mmap:
MapFile(result, path);
return &result->wad;
}
static void W_Win32_CloseFile(wad_file_t *wad)
{
win32_wad_file_t *win32_wad;
win32_wad = (win32_wad_file_t *) wad;
// If mapped, unmap it.
if (win32_wad->wad.mapped != NULL)
{
UnmapViewOfFile(win32_wad->wad.mapped);
}
if (win32_wad->handle_map != NULL)
{
CloseHandle(win32_wad->handle_map);
}
// Close the file
if (win32_wad->handle != NULL)
{
CloseHandle(win32_wad->handle);
}
Z_Free(win32_wad);
}
// Read data from the specified position in the file into the
// provided buffer. Returns the number of bytes read.
size_t W_Win32_Read(wad_file_t *wad, unsigned int offset,
void *buffer, size_t buffer_len)
{
win32_wad_file_t *win32_wad;
DWORD bytes_read;
DWORD result;
win32_wad = (win32_wad_file_t *) wad;
// Jump to the specified position in the file.
result = SetFilePointer(win32_wad->handle, offset, NULL, FILE_BEGIN);
if (result == INVALID_SET_FILE_POINTER)
{
I_Error("W_Win32_Read: Failed to set file pointer to %i",
offset);
}
// Read into the buffer.
if (!ReadFile(win32_wad->handle, buffer, buffer_len, &bytes_read, NULL))
{
I_Error("W_Win32_Read: Error reading from file");
}
return bytes_read;
}
wad_file_class_t win32_wad_file =
{
W_Win32_OpenFile,
W_Win32_CloseFile,
W_Win32_Read,
};
#endif /* #ifdef _WIN32 */
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