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/* See LICENSE file for copyright and license details. */
#include "liblss16.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#if defined(__clang__)
# pragma clang diagnostic ignored "-Wunsafe-buffer-usage"
#endif
static const char *argv0 = "lss16toppm";
static void
writeall(char *buf, size_t n)
{
ssize_t r;
while (n) {
r = write(STDOUT_FILENO, buf, n);
if (r < 0) {
if (errno == EINTR)
continue;
fprintf(stderr, "%s: write <stdout>: %s\n", argv0, strerror(errno));
exit(2);
}
buf += (size_t)r;
n -= (size_t)r;
}
}
int
main(int argc, char *argv[])
{
char buf[1024], wbuf[1024];
uint8_t pixels[1024];
struct liblss16_decoder decoder;
enum liblss16_decode_state state;
ssize_t r;
size_t n, off, consumed, npixels, pending;
enum liblss16_decode_error error;
int head_printed = 0;
int print_colour_map = 0;
int have_stdout = 0, len;
size_t i;
/* cmdline syntax is inherited from the SYSLINUX implementation,
* it's bad, but it's the way it is, and the way it will remain */
if (argc) {
argv0 = *argv++;
argc--;
}
for (; argc--; argv++) {
if (!strcmp(*argv, "-map")) {
print_colour_map = 1;
} else {
fprintf(stderr, "%s: Unknown option: %s\n", argv0, *argv);
return 2;
}
}
liblss16_decoder_init(&decoder);
pending = 0;
for (;;) {
r = read(STDIN_FILENO, buf, sizeof(buf));
if (r <= 0) {
if (!r)
break;
if (errno == EINTR)
continue;
fprintf(stderr, "%s: read <stdin>: %s\n", argv0, strerror(errno));
return 2;
}
n = (size_t)r;
for (off = 0; off < n;) {
state = liblss16_decode_to_colour_index(&decoder, &buf[off], n - off, &consumed,
pixels, sizeof(pixels) / sizeof(*pixels), &npixels, &error);
off += consumed;
if (state == LIBLSS16_DECODE_ERROR) {
goto error;
} else if (state == LIBLSS16_DECODE_END_OF_IMAGE) {
if (off != n) {
fprintf(stderr, "%s: image file contains extraneous data\n", argv0);
return 1;
}
}
if (!npixels)
continue;
if (!head_printed) {
head_printed = 1;
len = sprintf(wbuf, "P6\n%u %u\n255\n", decoder.image.width, decoder.image.height);
if (len < 0 || (size_t)len >= sizeof(wbuf))
abort();
pending = (size_t)len;
if (print_colour_map) {
for (i = 0; i < sizeof(decoder.image.colour_map) / sizeof(*decoder.image.colour_map); i++) {
fprintf(stderr, "#%02x%02x%02x=%zu\n", decoder.image.colour_map[i].r,
decoder.image.colour_map[i].g, decoder.image.colour_map[i].b, i);
}
}
}
for (i = 0; i < npixels; i++) {
if (3U > sizeof(wbuf) - pending) {
writeall(wbuf, pending);
pending = 0;
}
wbuf[pending++] = (char)decoder.image.colour_map[pixels[i]].r;
wbuf[pending++] = (char)decoder.image.colour_map[pixels[i]].g;
wbuf[pending++] = (char)decoder.image.colour_map[pixels[i]].b;
}
}
}
if (pending)
writeall(wbuf, pending);
state = liblss16_decode_to_colour_index(&decoder, NULL, 0, &consumed, pixels,
sizeof(pixels) / sizeof(*pixels), &npixels, &error);
if (state == LIBLSS16_DECODE_ERROR) {
error:
fprintf(stderr, "%s: %s\n", argv0, liblss16_decode_strerror(error));
return 1;
} else if (state != LIBLSS16_DECODE_END_OF_IMAGE) {
fprintf(stderr, "%s: image file truncated\n", argv0);
return 1;
}
while (close(STDOUT_FILENO)) {
if (have_stdout && errno == EBADF)
break;
if (errno == EINTR) {
have_stdout = 1;
} else {
fprintf(stderr, "%s: write <stdout>: %s\n", argv0, strerror(errno));
return 2;
}
}
return 0;
}
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