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
|
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/wait.h>
#include "meh.h"
struct image *imagemagick_open(FILE *f){
char template[] = "/tmp/fileXXXXXX";
char *ntmp = mktemp(template);
if(!ntmp){
perror("mktemp");
exit(EXIT_FAILURE);
}
int pid;
if(!(pid = fork())){
int origfd = fileno(f);
if(lseek(origfd, 0, SEEK_SET) != 0){
perror("lseek");
exit(EXIT_FAILURE);
}
char *argv[6];
argv[0] = "convert";
argv[1] = "-depth";
argv[2] = "255";
asprintf(&argv[3], "fd:%i", origfd);
asprintf(&argv[4], "ppm:%s", ntmp);
argv[5] = NULL;
execvp(argv[0], argv);
perror("exec");
exit(EXIT_FAILURE);
}else{
int status;
waitpid(pid, &status, 0);
if(status){
return NULL;
}
fclose(f);
FILE *ftmp;
if(!(ftmp = fopen(ntmp, "rb"))){
perror("fopen");
exit(EXIT_FAILURE);
}
return netpbm.open(ftmp);
}
}
struct imageformat imagemagick = {
imagemagick_open,
NULL,
NULL,
NULL
};
|
