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Diffstat (limited to 'i/pc104/initrd/conf/busybox/coreutils/cksum.c')
-rw-r--r--i/pc104/initrd/conf/busybox/coreutils/cksum.c54
1 files changed, 54 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/coreutils/cksum.c b/i/pc104/initrd/conf/busybox/coreutils/cksum.c
new file mode 100644
index 0000000..66a255c
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/coreutils/cksum.c
@@ -0,0 +1,54 @@
+/* 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 "busybox.h"
+
+int cksum_main(int argc, char **argv);
+int cksum_main(int argc, char **argv)
+{
+
+ uint32_t *crc32_table = crc32_filltable(1);
+
+ FILE *fp;
+ uint32_t crc;
+ long length, filesize;
+ int bytes_read;
+ char *cp;
+
+ int inp_stdin = (argc == optind) ? 1 : 0;
+
+ do {
+ fp = fopen_or_warn_stdin((inp_stdin) ? bb_msg_standard_input : *++argv);
+
+ crc = 0;
+ length = 0;
+
+ while ((bytes_read = fread(bb_common_bufsiz1, 1, BUFSIZ, fp)) > 0) {
+ cp = bb_common_bufsiz1;
+ length += bytes_read;
+ while (bytes_read--)
+ crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ (*cp++)) & 0xffL];
+ }
+
+ filesize = length;
+
+ for (; length; length >>= 8)
+ crc = (crc << 8) ^ crc32_table[((crc >> 24) ^ length) & 0xffL];
+ crc ^= 0xffffffffL;
+
+ if (inp_stdin) {
+ printf("%" PRIu32 " %li\n", crc, filesize);
+ break;
+ }
+
+ printf("%" PRIu32 " %li %s\n", crc, filesize, *argv);
+ fclose(fp);
+ } while (*(argv + 1));
+
+ fflush_stdout_and_exit(EXIT_SUCCESS);
+}