--- libelwix/src/crc_tbl.c	2014/01/30 07:33:20	1.3
+++ libelwix/src/crc_tbl.c	2024/10/12 16:08:18	1.6
@@ -3,7 +3,7 @@
 *  by Michael Pounov <misho@openbsd-bg.org>
 *
 * $Author: misho $
-* $Id: crc_tbl.c,v 1.3 2014/01/30 07:33:20 misho Exp $
+* $Id: crc_tbl.c,v 1.6 2024/10/12 16:08:18 misho Exp $
 *
 **************************************************************************
 The ELWIX and AITNET software is distributed under the following
@@ -12,7 +12,7 @@ terms:
 All of the documentation and software included in the ELWIX and AITNET
 Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
 
-Copyright 2004 - 2014
+Copyright 2004 - 2024
 	by Michael Pounov <misho@elwix.org>.  All rights reserved.
 
 Redistribution and use in source and binary forms, with or without
@@ -47,6 +47,44 @@ SUCH DAMAGE.
 
 
 /* 
+ * Table of CRC-8's of all single-byte values
+ */
+static const uint8_t crc8_table[256] = {
+    0x00, 0x07, 0x0E, 0x09, 0x1C, 0x1B, 0x12, 0x15,
+    0x38, 0x3F, 0x36, 0x31, 0x24, 0x23, 0x2A, 0x2D,
+    0x70, 0x77, 0x7E, 0x79, 0x6C, 0x6B, 0x62, 0x65,
+    0x48, 0x4F, 0x46, 0x41, 0x54, 0x53, 0x5A, 0x5D,
+    0xE0, 0xE7, 0xEE, 0xE9, 0xFC, 0xFB, 0xF2, 0xF5,
+    0xD8, 0xDF, 0xD6, 0xD1, 0xC4, 0xC3, 0xCA, 0xCD,
+    0x90, 0x97, 0x9E, 0x99, 0x8C, 0x8B, 0x82, 0x85,
+    0xA8, 0xAF, 0xA6, 0xA1, 0xB4, 0xB3, 0xBA, 0xBD,
+    0xC7, 0xC0, 0xC9, 0xCE, 0xDB, 0xDC, 0xD5, 0xD2,
+    0xFF, 0xF8, 0xF1, 0xF6, 0xE3, 0xE4, 0xED, 0xEA,
+    0xB7, 0xB0, 0xB9, 0xBE, 0xAB, 0xAC, 0xA5, 0xA2,
+    0x8F, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9D, 0x9A,
+    0x27, 0x20, 0x29, 0x2E, 0x3B, 0x3C, 0x35, 0x32,
+    0x1F, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0D, 0x0A,
+    0x57, 0x50, 0x59, 0x5E, 0x4B, 0x4C, 0x45, 0x42,
+    0x6F, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7D, 0x7A,
+    0x89, 0x8E, 0x87, 0x80, 0x95, 0x92, 0x9B, 0x9C,
+    0xB1, 0xB6, 0xBF, 0xB8, 0xAD, 0xAA, 0xA3, 0xA4,
+    0xF9, 0xFE, 0xF7, 0xF0, 0xE5, 0xE2, 0xEB, 0xEC,
+    0xC1, 0xC6, 0xCF, 0xC8, 0xDD, 0xDA, 0xD3, 0xD4,
+    0x69, 0x6E, 0x67, 0x60, 0x75, 0x72, 0x7B, 0x7C,
+    0x51, 0x56, 0x5F, 0x58, 0x4D, 0x4A, 0x43, 0x44,
+    0x19, 0x1E, 0x17, 0x10, 0x05, 0x02, 0x0B, 0x0C,
+    0x21, 0x26, 0x2F, 0x28, 0x3D, 0x3A, 0x33, 0x34,
+    0x4E, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5C, 0x5B,
+    0x76, 0x71, 0x78, 0x7F, 0x6A, 0x6D, 0x64, 0x63,
+    0x3E, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2C, 0x2B,
+    0x06, 0x01, 0x08, 0x0F, 0x1A, 0x1D, 0x14, 0x13,
+    0xAE, 0xA9, 0xA0, 0xA7, 0xB2, 0xB5, 0xBC, 0xBB,
+    0x96, 0x91, 0x98, 0x9F, 0x8A, 0x8D, 0x84, 0x83,
+    0xDE, 0xD9, 0xD0, 0xD7, 0xC2, 0xC5, 0xCC, 0xCB,
+    0xE6, 0xE1, 0xE8, 0xEF, 0xFA, 0xFD, 0xF4, 0xF3
+};
+
+/* 
  * Table of CRC-32's of all single-byte values
  */
 static const uint32_t crc32_table[256] = {
@@ -110,7 +148,7 @@ static const uint32_t crc32_table[256] = {
 #define DO8(crc, buf)	DO4(crc, buf); DO4(crc, buf);
 
 /*
- * crc_32() - CRC32 calculation from table
+ * crc32tbl() - CRC32 calculation from table
  *
  * @crc = Initial crc value
  * @buf = Data for calculation
@@ -118,8 +156,10 @@ static const uint32_t crc32_table[256] = {
  * return: calculated CRC32
  */
 uint32_t
-crc_32(uint32_t crc, const uint8_t * __restrict buf, uint32_t len)
+crc32tbl(uint32_t crc, const uint8_t * __restrict buf, uint32_t len)
 {
+	assert(buf);
+
 	crc = crc ^ 0xffffffff;
 	while (len >= 8) {
 		DO8(crc, buf);
@@ -130,4 +170,24 @@ crc_32(uint32_t crc, const uint8_t * __restrict buf, u
 			DO1(crc, buf);
 		} while (--len);
 	return crc ^ 0xffffffff;
+}
+
+/*
+ * crc8tbl() - CRC8 calculation from table
+ *
+ * @crc = Initial crc value
+ * @buf = Data for calculation
+ * @len = Length of data
+ * return: calculated CRC8
+ */
+uint8_t
+crc8tbl(uint8_t crc, const uint8_t * __restrict buf, uint32_t len)
+{
+	assert(buf);
+
+	while (len--)
+		crc = crc8_table[(*buf++) ^ crc];
+
+	return crc;
+
 }