1 files changed, 67 insertions, 0 deletions
diff --git a/release/src/router/busybox/coreutils/cksum.c b/release/src/router/busybox/coreutils/cksum.c
new file mode 100644
index 00000000..3a77c753
--- /dev/null
+++ b/release/src/router/busybox/coreutils/cksum.c
@@ -0,0 +1,67 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * cksum - calculate the CRC32 checksum of a file
+ *
+ * Copyright (C) 2006 by Rob Sullivan, with ideas from code by Walter Harms
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. */
+
+#include "libbb.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);
+	uint32_t crc;
+	off_t length, filesize;
+	int bytes_read;
+	int exit_code = EXIT_SUCCESS;
+	uint8_t *cp;
+
+#if ENABLE_DESKTOP
+	getopt32(argv, ""); /* coreutils 6.9 compat */
+	argv += optind;
+#else
+	argv++;
+#endif
+
+	do {
+		int fd = open_or_warn_stdin(*argv ? *argv : bb_msg_standard_input);
+
+		if (fd < 0) {
+			exit_code = EXIT_FAILURE;
+			continue;
+		}
+		crc = 0;
+		length = 0;
+
+#define read_buf bb_common_bufsiz1
+		while ((bytes_read = safe_read(fd, read_buf, sizeof(read_buf))) > 0) {
+			cp = (uint8_t *) read_buf;
+			length += bytes_read;
+			do {
+				crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *cp++];
+			} while (--bytes_read);
+		}
+		close(fd);
+
+		filesize = length;
+
+		while (length) {
+			crc = (crc << 8) ^ crc32_table[(uint8_t)(crc >> 24) ^ (uint8_t)length];
+			/* must ensure that shift is unsigned! */
+			if (sizeof(length) <= sizeof(unsigned))
+				length = (unsigned)length >> 8;
+			else if (sizeof(length) <= sizeof(unsigned long))
+				length = (unsigned long)length >> 8;
+			else
+				length = (unsigned long long)length >> 8;
+		}
+		crc = ~crc;
+
+		printf((*argv ? "%"PRIu32" %"OFF_FMT"i %s\n" : "%"PRIu32" %"OFF_FMT"i\n"),
+				crc, filesize, *argv);
+	} while (*argv && *++argv);
+
+	fflush_stdout_and_exit(exit_code);
+}