diff options
Diffstat (limited to 'coreutils/cksum.c')
| -rw-r--r-- | coreutils/cksum.c | 42 |
1 files changed, 27 insertions, 15 deletions
diff --git a/coreutils/cksum.c b/coreutils/cksum.c index 633322b..ecc4385 100644 --- a/coreutils/cksum.c +++ b/coreutils/cksum.c @@ -9,32 +9,39 @@ //config:config CKSUM //config: bool "cksum (4.1 kb)" //config: default y -//config: help -//config: cksum is used to calculate the CRC32 checksum of a file. +//config: +//config:config CRC32 +//config: bool "crc32 (4.1 kb)" +//config: default y //applet:IF_CKSUM(APPLET_NOEXEC(cksum, cksum, BB_DIR_USR_BIN, BB_SUID_DROP, cksum)) +//applet:IF_CKSUM(APPLET_NOEXEC(crc32, cksum, BB_DIR_USR_BIN, BB_SUID_DROP, cksum)) /* bb_common_bufsiz1 usage here is safe wrt NOEXEC: not expecting it to be zeroed. */ //kbuild:lib-$(CONFIG_CKSUM) += cksum.o +//kbuild:lib-$(CONFIG_CRC32) += cksum.o //usage:#define cksum_trivial_usage //usage: "FILE..." //usage:#define cksum_full_usage "\n\n" -//usage: "Calculate the CRC32 checksums of FILEs" +//usage: "Calculate CRC32 checksum of FILEs" #include "libbb.h" #include "common_bufsiz.h" /* This is a NOEXEC applet. Be very careful! */ +#define IS_CRC32 (ENABLE_CRC32 && (!ENABLE_CKSUM || applet_name[1] == 'r')) +#define IS_CKSUM (ENABLE_CKSUM && (!ENABLE_CRC32 || applet_name[1] == 'k')) + 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); + uint32_t *crc32_table = crc32_filltable(NULL, IS_CKSUM); int exit_code = EXIT_SUCCESS; #if ENABLE_DESKTOP - getopt32(argv, ""); /* coreutils 6.9 compat */ + getopt32(argv, ""); /* cksum coreutils 6.9 compat */ argv += optind; #else argv++; @@ -51,33 +58,38 @@ int cksum_main(int argc UNUSED_PARAM, char **argv) continue; } - crc = 0; + crc = IS_CKSUM ? 0 : 0xffffffff; 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 { - /* Checksum filesize bytes, LSB first, and exit */ close(fd); fd = -1; /* break flag */ - t = filesize; - bytes_read = 0; - while (t != 0) { - read_buf[bytes_read++] = (uint8_t)t; - t >>= 8; + /* Checksum filesize bytes, LSB first */ + if (IS_CKSUM) { + uoff_t 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); + crc = (IS_CKSUM ? crc32_block_endian1 : crc32_block_endian0)(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"), + if (IS_CKSUM) + printf((*argv ? "%u %"OFF_FMT"u %s\n" : "%u %"OFF_FMT"u\n"), (unsigned)crc, filesize, *argv); + else + printf((*argv ? "%08x %s\n" : "%08x\n"), + (unsigned)crc, *argv); } while (*argv && *++argv); fflush_stdout_and_exit(exit_code); |