added low-level crc interfaces.

2 files changed, 64 insertions, 0 deletions

diff --git a/src/crc/mdso_crc32.c b/src/crc/mdso_crc32.c
new file mode 100644
index 0000000..1e3f6f6
--- /dev/null
+++ b/src/crc/mdso_crc32.c
@@ -0,0 +1,32 @@
+/****************************************************************/
+/*  mdso: midipix dso scavenger                                 */
+/*  Copyright (C) 2015  Z. Gilboa                               */
+/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */
+/****************************************************************/
+
+#include <stdint.h>
+#include <unistd.h>
+
+#include <mdso/mdso.h>
+#include <mdso/mdso_crc32.h>
+
+static const uint32_t crc32_table[256] = MDSO_CRC32_TABLE;
+
+uint32_t mdso_crc32_mbstr(const unsigned char * str, size_t * symlen)
+{
+	const unsigned char *	ch;
+	uint32_t		crc32;
+
+	crc32	= 0 ^ 0xFFFFFFFF;
+	ch	= str;
+
+	while (*ch) {
+		crc32 = (crc32 >> 8) ^ crc32_table[(crc32 ^ *ch) & 0xFF];
+		ch++;
+	}
+
+	if (symlen)
+		*symlen = ch - str;
+
+	return (crc32 ^ 0xFFFFFFFF);
+}
diff --git a/src/crc/mdso_crc64.c b/src/crc/mdso_crc64.c
new file mode 100644
index 0000000..893b87d
--- /dev/null
+++ b/src/crc/mdso_crc64.c
@@ -0,0 +1,32 @@
+/****************************************************************/
+/*  mdso: midipix dso scavenger                                 */
+/*  Copyright (C) 2015  Z. Gilboa                               */
+/*  Released under GPLv2 and GPLv3; see COPYING.MDSO.           */
+/****************************************************************/
+
+#include <stdint.h>
+#include <unistd.h>
+
+#include <mdso/mdso.h>
+#include <mdso/mdso_crc64.h>
+
+static const uint64_t crc64_table[256] = MDSO_CRC64_TABLE;
+
+uint64_t mdso_crc64_mbstr(const unsigned char * str, size_t * symlen)
+{
+	const unsigned char *	ch;
+	uint64_t		crc64;
+
+	crc64	= 0 ^ 0xFFFFFFFFFFFFFFFF;
+	ch	= str;
+
+	while (*ch) {
+		crc64 = (crc64 >> 8) ^ crc64_table[(crc64 ^ *ch) & 0xFF];
+		ch++;
+	}
+
+	if (symlen)
+		*symlen = ch - str;
+
+	return (crc64 ^ 0xFFFFFFFFFFFFFFFF);
+}