1 files changed, 165 insertions, 0 deletions
diff --git a/epan/crc16-tvb.c b/epan/crc16-tvb.c
new file mode 100644
index 00000000..112851d2
--- /dev/null
+++ b/epan/crc16-tvb.c
@@ -0,0 +1,165 @@
+/* crc16-tvb.c
+ * CRC-16 tvb routines
+ *
+ * 2004 Richard van der Hoff <richardv@mxtelecom.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * References:
+ *  "A Painless Guide to CRC Error Detection Algorithms", Ross Williams
+ *      http://www.repairfaq.org/filipg/LINK/F_crc_v3.html
+ *
+ *  ITU-T Recommendation V.42 (2002), "Error-Correcting Procedures for
+ *      DCEs using asynchronous-to-synchronous conversion", Para. 8.1.1.6.1
+ */
+
+#include "config.h"
+
+#include <glib.h>
+#include <epan/tvbuff.h>
+#include <wsutil/crc16.h>
+#include <epan/crc16-tvb.h>
+#include <wsutil/crc16-plain.h>
+
+
+guint16 crc16_ccitt_tvb(tvbuff_t *tvb, guint len)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, 0, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, 0, len);
+
+    return crc16_ccitt(buf, len);
+}
+
+guint16 crc16_x25_ccitt_tvb(tvbuff_t *tvb, guint len)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, 0, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, 0, len);
+
+    return crc16_x25_ccitt_seed(buf, len, 0xFFFF);
+}
+
+guint16 crc16_r3_ccitt_tvb(tvbuff_t *tvb, int offset, guint len)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    return crc16_x25_ccitt_seed(buf, len, 0);
+}
+
+guint16 crc16_ccitt_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    return crc16_ccitt(buf, len);
+}
+
+guint16 crc16_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint16 seed)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, 0, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, 0, len);
+
+    return crc16_ccitt_seed(buf, len, seed);
+}
+
+guint16 crc16_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    return crc16_ccitt_seed(buf, len, seed);
+}
+
+guint16 crc16_iso14443a_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    return crc16_iso14443a(buf, len);
+}
+
+guint16 crc16_usb_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    return crc16_usb(buf, len);
+}
+
+guint16 crc16_plain_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
+{
+    guint16 crc = crc16_plain_init();
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    crc = crc16_plain_update(crc, buf, len);
+
+    return crc16_plain_finalize(crc);
+}
+
+guint16 crc16_plain_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 crc)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    crc = crc16_plain_update(crc, buf, len);
+
+    return crc16_plain_finalize(crc);
+}
+
+guint16 crc16_0x9949_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    return crc16_0x9949_seed(buf, len, seed);
+}
+
+guint16 crc16_0x3D65_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len, guint16 seed)
+{
+    const guint8 *buf;
+
+    tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+    buf = tvb_get_ptr(tvb, offset, len);
+
+    return crc16_0x3D65_seed(buf, len, seed);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 4
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * vi: set shiftwidth=4 tabstop=8 expandtab:
+ * :indentSize=4:tabSize=8:noTabs=true:
+ */