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
|
#include <errno.h>
#include <fcntl.h>
#include <lisiblepng.h>
#include <lisiblestd/log.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#define LOG0(msg) fprintf(stderr, msg "\n")
#define LOGN(fmt, ...) fprintf(stderr, fmt "\n", __VA_ARGS__)
int main(int argc, char **argv) {
lstd_log_init();
if (argc != 2) {
LOG0("Usage: lisiblepng <png filepath>");
return 1;
}
const char *png_filepath = argv[1];
int fd = open(png_filepath, O_RDONLY);
struct stat st;
fstat(fd, &st);
u8 *png_file_data = mmap(NULL, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
LOGN("File size: %ld bytes", st.st_size);
if (!png_file_data) {
const char *error_message = strerror(errno);
LOGN("Couldn't map PNG file: %s", error_message);
return 1;
}
LisPng *png = LisPng_decode(png_file_data, st.st_size);
if (!png) {
LOG0("Couldn't decode PNG");
return 1;
}
LisPng_dump_ppm(png);
LisPng_destroy(png);
if (munmap(png_file_data, st.st_size) != 0) {
const char *error_message = strerror(errno);
LOGN("Couldn't unmap PNG file: %s", error_message);
return 1;
}
return 0;
}
|
