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authorBartlomiej Sieka <tur@semihalf.com>2008-04-22 12:27:56 +0200
committerWolfgang Denk <wd@denx.de>2008-04-25 00:01:06 +0200
commit215b01bba8bc662d35f72b084700b192d367dfb4 (patch)
tree339d9bea31b2cb37fc65c8b4c75e7597a11bba10 /lib_generic/crc32.c
parent8875e3abab986df930167ce5c1ac4f95dcacc81c (diff)
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Add support for calculating hashes with watchdog triggering
Implement watchodg-aware variants of hash calculation functions: - crc32_wd() - md5_wd() - sha1_csum_wd() The above functions calculate the hash of the input buffer in chunks, triggering the watchdog after processing each chunk. The chunk size is given as a function call parameter. Signed-off-by: Bartlomiej Sieka <tur@semihalf.com>
Diffstat (limited to 'lib_generic/crc32.c')
-rw-r--r--lib_generic/crc32.c27
1 files changed, 27 insertions, 0 deletions
diff --git a/lib_generic/crc32.c b/lib_generic/crc32.c
index b882daa..58cd22e 100644
--- a/lib_generic/crc32.c
+++ b/lib_generic/crc32.c
@@ -198,3 +198,30 @@ uint32_t ZEXPORT crc32_no_comp(uint32_t crc, const Bytef *buf, uInt len)
}
#endif
+
+/*
+ * Calculate the crc32 checksum triggering the watchdog every 'chunk_sz' bytes
+ * of input.
+ */
+ulong crc32_wd (ulong crc, const unsigned char *buf, uint len, uint chunk_sz)
+{
+#if defined(CONFIG_HW_WATCHDOG) || defined(CONFIG_WATCHDOG)
+ const unsigned char *end, *curr;
+ int chunk;
+
+ curr = buf;
+ end = buf + len;
+ while (curr < end) {
+ chunk = end - curr;
+ if (chunk > chunk_sz)
+ chunk = chunk_sz;
+ crc = crc32 (crc, curr, chunk);
+ curr += chunk;
+ WATCHDOG_RESET ();
+ }
+#else
+ crc = crc32 (crc, buf, len);
+#endif
+
+ return crc;
+}