/
physfs_archiver_wad.c
135 lines (113 loc) · 3.93 KB
/
physfs_archiver_wad.c
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
/*
* WAD support routines for PhysicsFS.
*
* This driver handles DOOM engine archives ("wads").
* This format (but not this driver) was designed by id Software for use
* with the DOOM engine.
* The specs of the format are from the unofficial doom specs v1.666
* found here: http://www.gamers.org/dhs/helpdocs/dmsp1666.html
* The format of the archive: (from the specs)
*
* A WAD file has three parts:
* (1) a twelve-byte header
* (2) one or more "lumps"
* (3) a directory or "info table" that contains the names, offsets, and
* sizes of all the lumps in the WAD
*
* The header consists of three four-byte parts:
* (a) an ASCII string which must be either "IWAD" or "PWAD"
* (b) a uint32 which is the number of lumps in the wad
* (c) a uint32 which is the file offset to the start of
* the directory
*
* The directory has one 16-byte entry for every lump. Each entry consists
* of three parts:
*
* (a) a uint32, the file offset to the start of the lump
* (b) a uint32, the size of the lump in bytes
* (c) an 8-byte ASCII string, the name of the lump, padded with zeros.
* For example, the "DEMO1" entry in hexadecimal would be
* (44 45 4D 4F 31 00 00 00)
*
* Note that there is no way to tell if an opened WAD archive is a
* IWAD or PWAD with this archiver.
* I couldn't think of a way to provide that information, without being too
* hacky.
* I don't think it's really that important though.
*
*
* Please see the file LICENSE.txt in the source's root directory.
*
* This file written by Travis Wells, based on the GRP archiver by
* Ryan C. Gordon.
*/
#define __PHYSICSFS_INTERNAL__
#include "physfs_internal.h"
#if PHYSFS_SUPPORTS_WAD
static int wadLoadEntries(PHYSFS_Io *io, const PHYSFS_uint32 count, void *arc)
{
PHYSFS_uint32 i;
for (i = 0; i < count; i++)
{
PHYSFS_uint32 pos;
PHYSFS_uint32 size;
char name[9];
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &pos, 4), 0);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &size, 4), 0);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, name, 8), 0);
name[8] = '\0'; /* name might not be null-terminated in file. */
size = PHYSFS_swapULE32(size);
pos = PHYSFS_swapULE32(pos);
BAIL_IF_ERRPASS(!UNPK_addEntry(arc, name, 0, -1, -1, pos, size), 0);
} /* for */
return 1;
} /* wadLoadEntries */
static void *WAD_openArchive(PHYSFS_Io *io, const char *name,
int forWriting, int *claimed)
{
PHYSFS_uint8 buf[4];
PHYSFS_uint32 count;
PHYSFS_uint32 directoryOffset;
void *unpkarc;
assert(io != NULL); /* shouldn't ever happen. */
BAIL_IF(forWriting, PHYSFS_ERR_READ_ONLY, NULL);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, buf, sizeof (buf)), NULL);
if ((memcmp(buf, "IWAD", 4) != 0) && (memcmp(buf, "PWAD", 4) != 0))
BAIL(PHYSFS_ERR_UNSUPPORTED, NULL);
*claimed = 1;
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &count, sizeof (count)), NULL);
count = PHYSFS_swapULE32(count);
BAIL_IF_ERRPASS(!__PHYSFS_readAll(io, &directoryOffset, 4), 0);
directoryOffset = PHYSFS_swapULE32(directoryOffset);
BAIL_IF_ERRPASS(!io->seek(io, directoryOffset), 0);
unpkarc = UNPK_openArchive(io);
BAIL_IF_ERRPASS(!unpkarc, NULL);
if (!wadLoadEntries(io, count, unpkarc))
{
UNPK_abandonArchive(unpkarc);
return NULL;
} /* if */
return unpkarc;
} /* WAD_openArchive */
const PHYSFS_Archiver __PHYSFS_Archiver_WAD =
{
CURRENT_PHYSFS_ARCHIVER_API_VERSION,
{
"WAD",
"DOOM engine format",
"Travis Wells <traviswells@mchsi.com>",
"http://www.3dmm2.com/doom/",
0, /* supportsSymlinks */
},
WAD_openArchive,
UNPK_enumerate,
UNPK_openRead,
UNPK_openWrite,
UNPK_openAppend,
UNPK_remove,
UNPK_mkdir,
UNPK_stat,
UNPK_closeArchive
};
#endif /* defined PHYSFS_SUPPORTS_WAD */
/* end of physfs_archiver_wad.c ... */