diff options
Diffstat (limited to '')
-rw-r--r-- | bin/pngs.c | 75 |
1 files changed, 0 insertions, 75 deletions
diff --git a/bin/pngs.c b/bin/pngs.c deleted file mode 100644 index 6c26c303..00000000 --- a/bin/pngs.c +++ /dev/null @@ -1,75 +0,0 @@ -/* Copyright (c) 2018, June McEnroe <programble@gmail.com> - * - * 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 <fcntl.h> -#include <stdint.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <sysexits.h> -#include <unistd.h> - -static const uint8_t SIGNATURE[] = { 0x89, 'P', 'N', 'G', '\r', '\n', 0x1A, '\n' }; -static const uint8_t IEND[] = { 'I', 'E', 'N', 'D' }; - -static unsigned counter; -static char path[FILENAME_MAX]; -static int fd; - -static void next(const char *prefix) { - if (counter++) { - int error = close(fd); - if (error) err(EX_IOERR, "%s", path); - } - snprintf(path, sizeof(path), "%s%04u.png", prefix, counter); - fd = open(path, O_WRONLY | O_CREAT | O_EXCL, 0644); - if (fd < 0) err(EX_CANTCREAT, "%s", path); - printf("%s\n", path); -} - -static void writeAll(const uint8_t *buf, size_t size) { - while (size) { - ssize_t writeSize = write(fd, buf, size); - if (writeSize < 0) err(EX_IOERR, "%s", path); - buf += writeSize; - size -= writeSize; - } -} - -int main(int argc, char *argv[]) { - const char *prefix = (argc > 1) ? argv[1] : ""; - - for (;;) { - uint8_t buf[4096]; - ssize_t size = read(STDIN_FILENO, buf, sizeof(buf)); - if (size < 0) err(EX_IOERR, "read"); - if (!size) return EX_OK; - - const uint8_t *signature = memmem(buf, size, SIGNATURE, sizeof(SIGNATURE)); - if (signature) { - writeAll(buf, signature - buf); - next(prefix); - writeAll(signature, size - (signature - buf)); - } else { - const uint8_t *iend = memmem(buf, size, IEND, sizeof(IEND)); - if (iend && iend - buf < size - 8) { - warnx("trailing data, a PNG may be skipped"); - } - writeAll(buf, size); - } - } -} |