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
|
/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "cards.h"
static struct SDL_Surface *
dibSurface(struct SDL_RWops *rw, Uint32 offset, Uint32 length) {
Uint32 bitmapLength = 0x0E + length;
void *buffer = malloc(bitmapLength);
if (!buffer) {
SDL_SetError("malloc error: %s", strerror(errno));
return NULL;
}
struct SDL_RWops *bitmap = SDL_RWFromMem(buffer, bitmapLength);
if (!bitmap) {
free(buffer);
return NULL;
}
if (SDL_RWseek(rw, offset, RW_SEEK_SET) < 0) goto fail;
Uint32 dibHeaderLength = SDL_ReadLE32(rw);
Uint32 bitmapDataOffset = 0x0E + dibHeaderLength;
if (dibHeaderLength == 0x0C) {
if (SDL_RWseek(rw, 0x06, RW_SEEK_CUR) < 0) goto fail;
Uint16 bitsPerPixel = SDL_ReadLE16(rw);
bitmapDataOffset += 3 * (1 << bitsPerPixel);
} else if (dibHeaderLength == 0x28) {
if (SDL_RWseek(rw, 0x0A, RW_SEEK_CUR) < 0) goto fail;
Uint16 bitsPerPixel = SDL_ReadLE16(rw);
if (SDL_RWseek(rw, 0x10, RW_SEEK_CUR) < 0) goto fail;
Uint32 paletteLength = SDL_ReadLE32(rw);
if (!paletteLength) paletteLength = 1 << bitsPerPixel;
bitmapDataOffset += 4 * paletteLength;
} else {
SDL_SetError("unrecognized DIB header length %u", dibHeaderLength);
goto fail;
}
SDL_WriteU8(bitmap, 'B');
SDL_WriteU8(bitmap, 'M');
SDL_WriteLE32(bitmap, bitmapLength);
SDL_WriteLE16(bitmap, 0); // reserved
SDL_WriteLE16(bitmap, 0); // reserved
SDL_WriteLE32(bitmap, bitmapDataOffset);
if (SDL_RWseek(rw, offset, RW_SEEK_SET) < 0) goto fail;
if (SDL_RWread(rw, &buffer[SDL_RWtell(bitmap)], length, 1) < 1) goto fail;
SDL_RWseek(bitmap, 0, RW_SEEK_SET);
SDL_Surface *surface = SDL_LoadBMP_RW(bitmap, 1);
free(buffer);
return surface;
fail:
SDL_RWclose(bitmap);
free(buffer);
return NULL;
}
struct Cards *Cards_Load(struct SDL_RWops *rw) {
struct Cards *cards = calloc(1, sizeof(*cards));
if (!cards) {
SDL_SetError("calloc error: %s", strerror(errno));
return NULL;
}
if (SDL_RWseek(rw, 0, RW_SEEK_SET) < 0) goto fail;
if (SDL_ReadU8(rw) != 'M' || SDL_ReadU8(rw) != 'Z') {
SDL_SetError("invalid MZ signature");
goto fail;
}
if (SDL_RWseek(rw, 0x3C, RW_SEEK_SET) < 0) goto fail;
Uint16 neOffset = SDL_ReadLE16(rw);
if (SDL_RWseek(rw, neOffset, RW_SEEK_SET) < 0) goto fail;
if (SDL_ReadU8(rw) != 'N' || SDL_ReadU8(rw) != 'E') {
SDL_SetError("invalid NE signature");
goto fail;
}
if (SDL_RWseek(rw, neOffset + 0x24, RW_SEEK_SET) < 0) goto fail;
Uint16 resourceTableOffset = neOffset + SDL_ReadLE16(rw);
if (SDL_RWseek(rw, resourceTableOffset, RW_SEEK_SET) < 0) goto fail;
Uint16 alignmentShift = SDL_ReadLE16(rw);
Uint16 resourceCount;
for (;;) {
Uint16 typeID = SDL_ReadLE16(rw);
resourceCount = SDL_ReadLE16(rw);
SDL_ReadLE32(rw); // reserved
if (!typeID) {
SDL_SetError("no bitmap resources");
goto fail;
}
if (typeID == 0x8002) break;
if (SDL_RWseek(rw, 0x0C * resourceCount, RW_SEEK_CUR) < 0) goto fail;
}
for (Uint16 i = 0; i < resourceCount; ++i) {
Uint16 offset = SDL_ReadLE16(rw);
Uint16 length = SDL_ReadLE16(rw);
SDL_ReadLE16(rw); // flags
Uint16 id = SDL_ReadLE16(rw);
SDL_ReadLE32(rw); // reserved
id &= 0x7FFF;
if (id >= Cards_CardLen) continue;
Sint64 next = SDL_RWtell(rw);
if (next < 0) goto fail;
cards->surfaces[id] = dibSurface(
rw,
(Uint32)offset << alignmentShift,
(Uint32)length << alignmentShift
);
if (!cards->surfaces[id]) goto fail;
if (SDL_RWseek(rw, next, RW_SEEK_SET) < 0) goto fail;
}
int suits[4] = { Cards_Club, Cards_Diamond, Cards_Heart, Cards_Spade };
for (int suit = 0; suit < 4; ++suit) {
for (int rank = Cards_A; rank <= Cards_K; ++rank) {
if (cards->surfaces[suits[suit] + rank]) continue;
SDL_SetError("missing resource %d", suits[suit] + rank);
goto fail;
}
}
for (int i = Cards_Empty; i <= Cards_Back12; ++i) {
if (cards->surfaces[i]) continue;
SDL_SetError("missing resource %d", i);
goto fail;
}
for (int i = Cards_X; i <= Cards_O; ++i) {
if (cards->surfaces[i]) continue;
SDL_SetError("missing resource %d", i);
goto fail;
}
return cards;
fail:
Cards_Free(cards);
return NULL;
}
void Cards_Free(struct Cards *cards) {
for (int i = 0; i < Cards_CardLen; ++i) {
if (!cards->surfaces[i]) continue;
SDL_FreeSurface(cards->surfaces[i]);
}
free(cards);
}
|