From: Timo Sirainen <tss@iki.fi>
Date: Sun, 12 Oct 2008 11:40:08 +0000 (+0300)
Subject: Added crc32_[str_]more().
X-Git-Tag: 1.2.alpha3~48
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=906520ee2cece20c875835697db08cd5e29b919b;p=thirdparty%2Fdovecot%2Fcore.git

Added crc32_[str_]more().

--HG--
branch : HEAD
---

diff --git a/src/lib/crc32.c b/src/lib/crc32.c
index 4a8cdbe143..29a5bb02ca 100644
--- a/src/lib/crc32.c
+++ b/src/lib/crc32.c
@@ -59,9 +59,13 @@ static uint32_t crc32tab[256] = {
 };
 
 uint32_t crc32_data(const void *data, size_t size)
+{
+	return crc32_data_more((uint32_t)-1, data, size);
+}
+
+uint32_t crc32_data_more(uint32_t crc, const void *data, size_t size)
 {
 	const uint8_t *p = data, *end = p + size;
-	uint32_t crc = (uint32_t)-1;
 
 	for (; p != end; p++)
 		crc = (crc >> 8) ^ crc32tab[((crc ^ *p) & 0xff)];
@@ -69,9 +73,13 @@ uint32_t crc32_data(const void *data, size_t size)
 }
 
 uint32_t crc32_str(const char *str)
+{
+	return crc32_str_more((uint32_t)-1, str);
+}
+
+uint32_t crc32_str_more(uint32_t crc, const char *str)
 {
 	const uint8_t *p = (const uint8_t *)str;
-	uint32_t crc = (uint32_t)-1;
 
 	for (; *p != '\0'; p++)
 		crc = (crc >> 8) ^ crc32tab[((crc ^ *p) & 0xff)];
diff --git a/src/lib/crc32.h b/src/lib/crc32.h
index 5bcfe01c62..7892212b03 100644
--- a/src/lib/crc32.h
+++ b/src/lib/crc32.h
@@ -4,4 +4,7 @@
 uint32_t crc32_data(const void *data, size_t size) ATTR_PURE;
 uint32_t crc32_str(const char *str) ATTR_PURE;
 
+uint32_t crc32_data_more(uint32_t crc, const void *data, size_t size) ATTR_PURE;
+uint32_t crc32_str_more(uint32_t crc, const char *str) ATTR_PURE;
+
 #endif