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/* Copyright (C) 2022 June McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <err.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sysexits.h>
int main(int argc, char *argv[]) {
if (argc < 2) return EX_USAGE;
FILE *file = fopen(argv[1], "r");
if (!file) err(EX_NOINPUT, "%s", argv[1]);
size_t cap = 0x10000;
uint8_t *buf = malloc(cap);
if (!buf) err(EX_OSERR, "malloc");
size_t len = 0;
for (size_t n; 0 < (n = fread(&buf[len], 1, cap - len, file)); len += n) {
buf = realloc(buf, (cap *= 2));
if (!buf) err(EX_OSERR, "realloc");
}
unsigned nr = 0;
for (
uint8_t *ptr = buf;
NULL != (ptr = memmem(ptr, &buf[len] - ptr, "icns", 4));
ptr += 4
) {
if (&ptr[8] > &buf[len]) break;
size_t len = ptr[4] << 24 | ptr[5] << 16 | ptr[6] << 8 | ptr[7];
char path[64];
snprintf(path, sizeof(path), "icon%04u.icns", ++nr);
printf("%s\n", path);
FILE *icon = fopen(path, "w");
if (!icon) err(EX_CANTCREAT, "%s", path);
size_t n = fwrite(ptr, 8 + len, 1, icon);
if (!n) err(EX_IOERR, "%s", path);
int error = fclose(icon);
if (error) err(EX_IOERR, "%s", path);
}
}
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