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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "data.h"
int8_t ReadInt8(FILE *fp)
{
unsigned char d[1];
fread(d, 1, 1, fp);
return d[0];
}
int16_t ReadInt16M(FILE *fp)
{
unsigned char d[2];
fread(d, 1, 2, fp);
return d[1] | (d[0] << 8);
}
int32_t ReadInt32M(FILE *fp)
{
unsigned char d[4];
fread(d, 1, 4, fp);
return d[3] | (d[2] << 8) | (d[1] << 16) | (d[0] << 24);
}
#define IFF_UNKNOWN -1
#define IFF_LIST 0
#define IFF_FORM 1
#define IFF_TYPE_ILBM 2
#define IFF_PROP 3
#define IFF_TRAN 4
#define IFF_BMHD 6
#define IFF_CMAP 7
#define IFF_BODY 8
#define IFF_TYPE_MIPM 9
#define IFF_CONT 10
#define IFF_TYPE_PBM 11
#define IFF_DPPS 12
#define IFF_CRNG 13
#define IFF_TINY 14
int main(int argc, char *argv[])
{
FILE *fp;
char tag[4];
int c;
unsigned char *cmap;
int w, h;
int x, y;
int planes;
int masking;
int compression;
int tcolor;
int xa, ya;
int pw, ph;
if (argc != 2) {
fprintf(stderr, "usage: %s <file.lbm>\n", argv[0]);
exit(EXIT_FAILURE);
}
fp = fopen(argv[1], "rb");
if (fp == NULL) {
fprintf(stderr, "unable to open %s for reading\n", argv[1]);
exit(EXIT_FAILURE);
}
printf("Filename: %s\n", argv[1]);
/* printf("This program is lame. You have been warned.\n"); */
fseek(fp, 48, SEEK_SET);
fread(tag, 1, 4, fp);
if (tag[0] != 'I' || tag[1] != 'L' || tag[2] != 'B' || tag[3] != 'M') {
fprintf(stderr, "This program is lame! Give me a file in the right format please!\n");
exit(EXIT_FAILURE);
}
fread(tag, 1, 4, fp);
if (tag[0] != 'B' || tag[1] != 'M' || tag[2] != 'H' || tag[3] != 'D') {
fprintf(stderr, "This program is lame! Give me a file in the right format please!\n");
exit(EXIT_FAILURE);
}
if (ReadInt32M(fp) != 0x14) {
fprintf(stderr, "This program is lame! Give me a file in the right format please!\n");
exit(EXIT_FAILURE);
}
{
/* 'BMHD' */
w = ReadInt16M(fp);
h = ReadInt16M(fp);
x = ReadInt16M(fp);
y = ReadInt16M(fp);
planes = ReadInt8(fp);
masking = ReadInt8(fp);
compression = ReadInt8(fp);
ReadInt8(fp); /* padding */
tcolor = ReadInt16M(fp);
xa = ReadInt8(fp);
ya = ReadInt8(fp);
pw = ReadInt16M(fp);
ph = ReadInt16M(fp);
printf("Info: w:%d h:%d x:%d y:%d p:%d m:%02X c:%d tc:%d xa:%d ya:%d pw:%d ph:%d\n", w, h, x, y, planes, masking, compression, tcolor, xa, ya, pw, ph);
}
fread(tag, 1, 4, fp);
if (tag[0] != 'C' || tag[1] != 'M' || tag[2] != 'A' || tag[3] != 'P') {
fprintf(stderr, "How could you betray me, this is crap!\n");
exit(EXIT_FAILURE);
}
c = ReadInt32M(fp);
printf("Colors present = %d (%d)\n", c / 3, c);
if (c % 3) {
fprintf(stderr, "Gee, your colormap is messed up!\n");
exit(EXIT_FAILURE);
}
printf("Offset = %d\n", ftell(fp));
cmap = (unsigned char *)malloc(c);
fread(cmap, 1, c, fp);
if (c & 1)
fgetc(fp); /* throwaway extra byte (even padding) */
printf("Offset = %d\n", ftell(fp));
fread(tag, 1, 4, fp);
printf("Offset = %d\n", ftell(fp));
if (tag[0] != 'B' || tag[1] != 'O' || tag[2] != 'D' || tag[3] != 'Y') {
printf("Where's the body tag!?\n");
exit(EXIT_FAILURE);
}
{
unsigned char *compbuf;
unsigned char *grphbuf;
int len, len2;
int rw;
int i, j, p, pixel;
len2 = ReadInt32M(fp);
printf("Pos 1: pos:%d len:%d\n", ftell(fp), len2);
rw = ((w + 7) / 8) * 8; /* round up to multiple of 8 */
len = rw * h * planes / 8;
grphbuf = (unsigned char *)malloc(w * h * 3);
compbuf = (unsigned char *)malloc(len);
if (compression == 1) {
j = 0;
while (len2 > 0) {
signed char s = fgetc(fp);
len2--;
if (s >= 0) {
i = s + 1;
fread(&compbuf[j], 1, i, fp);
j += i;
len2 -= i;
} else {
if (s == -128) printf("Nop?\n");
i = -s+1;
p = fgetc(fp);
len2--;
while (i--) {
compbuf[j] = p;
j++;
}
}
}
if (len2 < 0) printf("somebody set up us the messed up decompression: %d\n", len2);
} else if (compression == 0) {
fread(compbuf, 1, len, fp);
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
for (pixel = 0, p = 0; p < planes; p++) {
if (compbuf[(rw/8)*p+(rw*planes/8)*j+i/8] & (1 << (7 - (i & 7))))
pixel |= (1 << p);
}
grphbuf[(w*j+i)*3+0] = cmap[3*pixel+0];
grphbuf[(w*j+i)*3+1] = cmap[3*pixel+1];
grphbuf[(w*j+i)*3+2] = cmap[3*pixel+2];
}
}
} else {
fprintf(stderr, "What kinda compression is this?!\n");
exit(EXIT_FAILURE);
}
for (j = 0; j < h; j++) {
for (i = 0; i < w; i++) {
for (pixel = 0, p = 0; p < planes; p++) {
if (compbuf[(rw/8)*p+(rw*planes/8)*j+i/8] & (1 << (7 - (i & 7))))
pixel |= (1 << p);
}
grphbuf[(w*j+i)*3+0] = cmap[3*pixel+0];
grphbuf[(w*j+i)*3+1] = cmap[3*pixel+1];
grphbuf[(w*j+i)*3+2] = cmap[3*pixel+2];
}
}
if (ftell(fp) & 1) fgetc(fp);
printf("Pos 2: pos:%d\n", ftell(fp));
{
char *fn;
fn = (char *)malloc(strlen(argv[1])+6);
strcpy(fn, argv[1]);
strcat(fn, ".pcx");
SavePCXRGBToFile(grphbuf, w, h, fn);
free(fn);
}
p = fgetc(fp);
if (p != -1) {
printf("%c", p);
printf("%c", fgetc(fp));
printf("%c", fgetc(fp));
printf("%c", fgetc(fp));
printf("\n");
}
free(compbuf);
free(grphbuf);
}
free(cmap);
fclose(fp);
return 0;
}
|
