Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 198 insertions, 0 deletions

diff --git a/plugins/epan/wimax/crc.c b/plugins/epan/wimax/crc.c
new file mode 100644
index 00000000..4bc74a2a
--- /dev/null
+++ b/plugins/epan/wimax/crc.c
@@ -0,0 +1,198 @@
+/* crc.c
+ * crc checksum generation and calculation functions: crc.c
+ *
+ * Copyright (c) 2007 by Intel Corporation.
+ *
+ * Author: Mike Harvey <michael.harvey@intel.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1999 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "crc.h"
+
+#define WMAX_MAC_CRC32_POLYNOMIAL 0x04c11db7U /* polynomial used in calculating the CRC-32 checksum */
+#define CCITT_X25_CRC16_POLYNOMIAL 0x1021     /* polynomial used in calculating the CRC-16 checksum */
+#define WMAX_MAC_CRC8_POLYNOMIAL  0x07        /* polynomial used in calculating the CRC-8 checksum */
+#define CRC32_INITIAL_VALUE       0xFFFFFFFF
+#define CRC16_INITIAL_VALUE       0xFFFF
+
+#ifndef STATIC_DATA
+static guint8  crc8_table[256];
+static guint32 crc32_table[256];
+
+extern guint16 crc16_table[256];
+
+/*
+  void wimax_mac_gen_crc32_table(void)
+
+  REQUIRES: The functions must be called only once to initialze CRC table
+
+  DESCRIPTION:  Generate the table of CRC remainders
+                for all possible bytes
+
+  ARGS:
+
+  RETURNS:
+
+  SIDE EFFECTS:
+
+*/
+void wimax_mac_gen_crc32_table(void)
+{
+  guint32 i, bit;
+  guint32 crc;
+
+  /* little-endian (reflected) algorithm */
+  for ( i = 0;  i < G_N_ELEMENTS(crc32_table);  i++ )
+  {
+    crc = ( i << 24 );
+    for ( bit = 0;  bit < 8;  bit++ )
+    {
+      if ( crc & 0x80000000U )
+        crc = ( crc << 1 ) ^ WMAX_MAC_CRC32_POLYNOMIAL;
+      else
+        crc = ( crc << 1 );
+    }
+    crc32_table[i] = crc;
+  }
+}
+
+/*
+  void wimax_mac_gen_crc8_table(void)
+
+  REQUIRES: The functions must be called only once to initialze CRC table
+
+  DESCRIPTION:  Generate the table of CRC remainders
+                for all possible bytes
+
+  ARGS:
+
+  RETURNS:
+
+  SIDE EFFECTS:
+
+*/
+void wimax_mac_gen_crc8_table(void)
+{
+  guint  i, bit;
+  guint8 crc;
+
+  for ( i = 0;  i < G_N_ELEMENTS(crc8_table);  i++ )
+  {
+    crc = i;
+    for ( bit = 0;  bit < 8;  bit++ )
+    {
+      if ( crc & 0x80 )
+        crc = ( crc << 1 ) ^ WMAX_MAC_CRC8_POLYNOMIAL;
+      else
+        crc = ( crc << 1 );
+    }
+    crc8_table[i] = crc;
+  }
+}
+#endif
+
+/*
+
+  guint32 wimax_mac_calc_crc32(guint8 *data, guint data_len)
+
+  REQUIRES: wimax_mac_gen_crc32_table() must be called before
+
+  DESCRIPTION: Calculate the 32-bit CRC from a given data block
+
+  ARGS:  data - pointer to data
+         data_len - length of data (in bytes)
+
+  RETURNS:  calculated crc32
+
+  SIDE EFFECTS:
+
+*/
+guint32 wimax_mac_calc_crc32(const guint8 *data, guint data_len)
+{
+  guint32 crc=CRC32_INITIAL_VALUE;
+  guint i, j;
+
+  for ( j = 0;  j < data_len;  j++ )
+  {
+    i = ( (guint8)(crc>>24) ^ data[j] ) & 0xff;
+    crc = ( crc<<8 ) ^ crc32_table[i];
+  }
+  return ~crc;
+}
+
+/*
+
+  guint16 wimax_mac_calc_crc16(guint8 *data, guint data_len)
+
+  REQUIRES: crc16_table[] in crc_data.c
+
+  DESCRIPTION: Calculate the 16-bit CRC from a given data block
+
+  ARGS:  data - pointer to data
+         data_len - length of data (in bytes)
+
+  RETURNS:  calculated crc16
+
+  SIDE EFFECTS:
+
+*/
+guint16 wimax_mac_calc_crc16(const guint8 *data, guint data_len)
+{
+  guint32 crc=CRC16_INITIAL_VALUE;
+  guint j;
+
+  for ( j = 0;  j < data_len;  j++ )
+  {
+    crc ^= data[j] << 8;
+    crc = (crc << 8) ^ crc16_table[(crc & 0xff00) >> 8];
+  }
+  crc ^= 0xFFFF;        /* Invert the output. */
+  crc &= 0xFFFF;
+  return crc;
+}
+
+/*
+
+  guint8 wimax_mac_calc_crc8(guint8 *data, guint data_len)
+
+  REQUIRES: wimax_mac_gen_crc8_table() must be called before
+
+  DESCRIPTION: Calculate the 8-bit CRC from a given data block
+
+  ARGS:  data - pointer to data
+         data_len - length of data (in bytes)
+
+  RETURNS:  calculated crc8
+
+  SIDE EFFECTS:
+
+*/
+guint8 wimax_mac_calc_crc8(const guint8 *data, guint data_len)
+{
+  guint8 crc=0;
+  guint i;
+
+  for(i = 0; i < data_len; i++)
+  {
+    crc = crc8_table[data[i]^crc];
+  }
+  return crc;
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local Variables:
+ * c-basic-offset: 2
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=2 tabstop=8 expandtab:
+ * :indentSize=2:tabSize=8:noTabs=true:
+ */