1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
//
// 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 "config.h"
#ifdef _WIN32
#include <stdio.h>
#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;
wchar_t wpath[MAX_PATH + 1];
HANDLE handle;
// Open the file:
MultiByteToWideChar(CP_OEMCP, 0,
path, strlen(path) + 1,
wpath, sizeof(wpath));
handle = CreateFileW(wpath,
GENERIC_READ,
FILE_SHARE_READ,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (handle == INVALID_HANDLE_VALUE)
{
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 */
|
