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
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
|
/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <arpa/inet.h>
#include <sys/wait.h>
#include <inttypes.h>
#include <string.h>
#include <unistd.h>
USAGE("[-h] [-f | -p]")
static char buf[BUFSIZ];
static char width[3 * sizeof(size_t) + 1] = {0};
static char height[3 * sizeof(size_t) + 1] = {0};
static const char *conv_fail_msg = "convertion failed, if converting a farbfeld file, try -f";
static size_t pixel_size;
static double value_max;
static double (*get_value)(char **bufp);
static void (*convert)(size_t n);
static int with_alpha = 1;
static int with_colour = 1;
static double
get_value_u8(char** bufp)
{
uint8_t value = *(uint8_t *)(*bufp);
*bufp += 1;
return value / value_max;
}
static double
get_value_u16(char** bufp)
{
uint16_t value = ntohs(*(uint16_t *)(*bufp));
*bufp += 2;
return value / value_max;
}
static double
get_value_u32(char** bufp)
{
uint32_t value = ntohl(*(uint32_t *)(*bufp));
*bufp += 4;
return value / value_max;
}
static double
get_value_u64(char** bufp)
{
uint64_t value;
value = (uint64_t)(buf[0]) << 56;
value |= (uint64_t)(buf[1]) << 48;
value |= (uint64_t)(buf[2]) << 40;
value |= (uint64_t)(buf[3]) << 32;
value |= (uint64_t)(buf[4]) << 24;
value |= (uint64_t)(buf[5]) << 16;
value |= (uint64_t)(buf[6]) << 8;
value |= (uint64_t)(buf[7]);
*bufp += 8;
return value / value_max;
}
static void
from_srgb(size_t n)
{
double red, green, blue, pixel[4];
size_t ptr;
char *p;
for (ptr = 0; ptr + pixel_size <= n; ptr += pixel_size) {
p = buf + ptr;
red = srgb_decode(get_value(&p));
green = with_colour ? srgb_decode(get_value(&p)) : red;
blue = with_colour ? srgb_decode(get_value(&p)) : red;
pixel[3] = with_alpha ? get_value(&p) : 1;
srgb_to_ciexyz(red, green, blue, pixel + 0, pixel + 1, pixel + 2);
ewriteall(STDOUT_FILENO, pixel, sizeof(pixel), "<stdout>");
}
}
static size_t
farbfeld_head(int fd, const char *fname)
{
if (ereadall(fd, buf, 16, fname) != 16)
eprintf("%s\n", conv_fail_msg);
if (memcmp(buf, "farbfeld", 8))
eprintf("%s\n", conv_fail_msg);
sprintf(width, "%"PRIu32, ntohl(*(uint32_t *)(buf + 8)));
sprintf(height, "%"PRIu32, ntohl(*(uint32_t *)(buf + 12)));
pixel_size = 4 * sizeof(uint16_t);
value_max = UINT16_MAX;
get_value = get_value_u16;
convert = from_srgb;
return 0;
}
static size_t
pam_head(int fd, const char *fname)
{
size_t ptr;
ssize_t r;
char *p;
unsigned long long int maxval = UINT8_MAX;
for (ptr = 0;;) {
r = read(fd, buf + ptr, sizeof(buf) - 1);
if (r < 0)
eprintf("read %s:", fname);
if (r == 0)
eprintf("%s\n", conv_fail_msg);
ptr += (size_t)r;
for (;;) {
p = memchr(buf, '\n', ptr);
if (!p) {
if (ptr == sizeof(buf))
eprintf("%s\n", conv_fail_msg);
break;
}
*p++ = '\0';
if (strstr(buf, "WIDTH ") == buf) {
if (*width || !buf[6] || strlen(buf + 6) >= sizeof(width))
eprintf("%s\n", conv_fail_msg);
strcpy(width, buf + 6);
} else if (strstr(buf, "HEIGHT ") == buf) {
if (*height || !buf[7] || strlen(buf + 7) >= sizeof(height))
eprintf("%s\n", conv_fail_msg);
strcpy(height, buf + 7);
} else if (strstr(buf, "MAXVAL ") == buf) {
if (tollu(buf + 7, 0, UINT64_MAX, &maxval)) {
if (errno != ERANGE)
eprintf("%s\n", conv_fail_msg);
eprintf("image uses greater colour resolution than supported\n");
} else if (!maxval) {
eprintf("%s\n", conv_fail_msg);
}
} else if (strstr(buf, "TUPLTYPE ") == buf) {
if (!strcmp(buf, "TUPLTYPE BLACKANDWHITE"))
maxval = 1, with_colour = 0, with_alpha = 0;
else if (!strcmp(buf, "TUPLTYPE BLACKANDWHITE_ALPHA"))
maxval = 1, with_colour = 0, with_alpha = 1;
else if (!strcmp(buf, "TUPLTYPE GRAYSCALE"))
with_colour = 0, with_alpha = 0;
else if (!strcmp(buf, "TUPLTYPE GRAYSCALE_ALPHA"))
with_colour = 0, with_alpha = 1;
else if (!strcmp(buf, "TUPLTYPE RGB"))
with_colour = 1, with_alpha = 0;
else if (!strcmp(buf, "TUPLTYPE RGB_ALPHA"))
with_colour = 1, with_alpha = 1;
else
eprintf("image uses an unsupported tuple type: %s\n", buf + sizeof("TUPLTYPE"));
} else if (!strcmp(buf, "ENDHDR")) {
memmove(buf, p, ptr -= (size_t)(p - buf));
goto header_done;
}
memmove(buf, p, ptr -= (size_t)(p - buf));
}
}
header_done:
if (maxval <= (size_t)UINT8_MAX) {
pixel_size = sizeof(uint8_t);
get_value = get_value_u8;
} else if (maxval <= (size_t)UINT16_MAX) {
pixel_size = sizeof(uint16_t);
get_value = get_value_u16;
} else if (maxval <= (size_t)UINT32_MAX) {
pixel_size = sizeof(uint32_t);
get_value = get_value_u32;
} else {
pixel_size = sizeof(uint64_t);
get_value = get_value_u64;
}
value_max = maxval;
pixel_size *= (with_colour ? 3 : 1) + with_alpha;
convert = from_srgb;
return ptr;
}
int
main(int argc, char *argv[])
{
int status, pipe_rw[2], i, old_fd, forked = 0;
int headless = 0, farbfeld = 0, pam = 0;
pid_t pid = 0;
size_t off, n;
ssize_t r;
const char *file = "<subprocess>";
ARGBEGIN {
case 'f':
farbfeld = 1;
break;
case 'h':
headless = 1;
break;
case 'p':
pam = 1;
break;
default:
usage();
} ARGEND;
if (argc || (farbfeld && pam))
usage();
if (farbfeld)
conv_fail_msg = "not a valid farbfeld file, try without -f";
else if (pam)
conv_fail_msg = "not a valid RGBA portable arbitrary map file, try without -p";
else
forked = 1;
if (!forked) {
file = "<stdin>";
pipe_rw[0] = STDIN_FILENO;
goto after_fork;
}
if (pipe(pipe_rw))
eprintf("pipe:");
if (pipe_rw[0] == STDIN_FILENO || pipe_rw[1] == STDIN_FILENO)
eprintf("no stdin open\n");
if (pipe_rw[0] == STDOUT_FILENO || pipe_rw[1] == STDOUT_FILENO)
eprintf("no stdout open\n");
for (i = 0; i < 2; i++) {
if (pipe_rw[i] == STDERR_FILENO) {
pipe_rw[i] = dup(old_fd = pipe_rw[i]);
if (pipe_rw[i] < 0)
eprintf("dup:");
close(old_fd);
}
}
pid = fork();
if (pid < 0)
eprintf("fork:");
if (!pid) {
close(pipe_rw[0]);
if (dup2(pipe_rw[1], STDOUT_FILENO) == -1)
eprintf("dup2:");
close(pipe_rw[1]);
/* XXX Is there a way to convert directly to raw XYZ? (Would avoid gamut truncation) */
execlp("convert", "convert", "-", "-depth", "32", "-alpha", "activate", "pam:-", NULL);
eprintf("exec convert:");
}
close(pipe_rw[1]);
after_fork:
if (farbfeld)
n = farbfeld_head(pipe_rw[0], file);
else
n = pam_head(pipe_rw[0], file);
if (!*width || !*height)
eprintf("%s\n", conv_fail_msg);
if (!headless) {
FPRINTF_HEAD_FMT(stdout, "%i", 1, "%s", width, "%s", height, "xyza");
efflush(stdout, "<stdout>");
}
for (;;) {
convert(n);
off = n - (n % pixel_size);
memmove(buf, buf + off, n -= off);
r = read(pipe_rw[0], buf + n, sizeof(buf) - n);
if (r < 0)
eprintf("read %s:", file);
if (r == 0)
break;
n += (size_t)r;
}
if (!forked)
return 0;
close(pipe_rw[0]);
while (waitpid(pid, &status, 0) != pid);
return !!status;
}
|
