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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/crc32.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/linux/crc32.h')
-rw-r--r--include/linux/crc32.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/include/linux/crc32.h b/include/linux/crc32.h
new file mode 100644
index 000000000000..56c0645789a9
--- /dev/null
+++ b/include/linux/crc32.h
@@ -0,0 +1,27 @@
+/*
+ * crc32.h
+ * See linux/lib/crc32.c for license and changes
+ */
+#ifndef _LINUX_CRC32_H
+#define _LINUX_CRC32_H
+
+#include <linux/types.h>
+
+extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len);
+extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len);
+extern u32 bitreverse(u32 in);
+
+#define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length)
+
+/*
+ * Helpers for hash table generation of ethernet nics:
+ *
+ * Ethernet sends the least significant bit of a byte first, thus crc32_le
+ * is used. The output of crc32_le is bit reversed [most significant bit
+ * is in bit nr 0], thus it must be reversed before use. Except for
+ * nics that bit swap the result internally...
+ */
+#define ether_crc(length, data) bitreverse(crc32_le(~0, data, length))
+#define ether_crc_le(length, data) crc32_le(~0, data, length)
+
+#endif /* _LINUX_CRC32_H */