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- #include "libbb.h"
- #include "common_bufsiz.h"
- int cksum_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
- int cksum_main(int argc UNUSED_PARAM, char **argv)
- {
- uint32_t *crc32_table = crc32_filltable(NULL, 1);
- int exit_code = EXIT_SUCCESS;
- #if ENABLE_DESKTOP
- getopt32(argv, "");
- argv += optind;
- #else
- argv++;
- #endif
- setup_common_bufsiz();
- do {
- uint32_t crc;
- off_t filesize;
- int fd = open_or_warn_stdin(*argv ? *argv : bb_msg_standard_input);
- if (fd < 0) {
- exit_code = EXIT_FAILURE;
- continue;
- }
- crc = 0;
- filesize = 0;
- #define read_buf bb_common_bufsiz1
- for (;;) {
- uoff_t t;
- int bytes_read = safe_read(fd, read_buf, COMMON_BUFSIZE);
- if (bytes_read > 0) {
- filesize += bytes_read;
- } else {
-
- close(fd);
- fd = -1;
- t = filesize;
- bytes_read = 0;
- while (t != 0) {
- read_buf[bytes_read++] = (uint8_t)t;
- t >>= 8;
- }
- }
- crc = crc32_block_endian1(crc, read_buf, bytes_read, crc32_table);
- if (fd < 0)
- break;
- }
- crc = ~crc;
- printf((*argv ? "%u %"OFF_FMT"u %s\n" : "%u %"OFF_FMT"u\n"),
- (unsigned)crc, filesize, *argv);
- } while (*argv && *++argv);
- fflush_stdout_and_exit(exit_code);
- }
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