Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 154 insertions, 0 deletions

diff --git a/epan/crc32-tvb.c b/epan/crc32-tvb.c
new file mode 100644
index 00000000..1a2e7d20
--- /dev/null
+++ b/epan/crc32-tvb.c
@@ -0,0 +1,154 @@
+/* crc32-tvb.c
+ * CRC-32 tvbuff routines
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ *
+ * Credits:
+ *
+ * Table from Solomon Peachy
+ * Routine from Chris Waters
+ */
+
+#include "config.h"
+
+#include <glib.h>
+#include <epan/tvbuff.h>
+#include <wsutil/crc32.h>
+#include <epan/crc32-tvb.h>
+
+
+guint32
+crc32_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 ( crc32_ccitt_seed(buf, len, CRC32_CCITT_SEED) );
+}
+
+guint32
+crc32_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 ( crc32_ccitt(buf, len) );
+}
+
+guint32
+crc32_ccitt_tvb_seed(tvbuff_t *tvb, guint len, guint32 seed)
+{
+	const guint8* buf;
+
+	tvb_ensure_bytes_exist(tvb, 0, len);  /* len == -1 not allowed */
+	buf = tvb_get_ptr(tvb, 0, len);
+
+	return ( crc32_ccitt_seed(buf, len, seed) );
+}
+
+guint32
+crc32_ccitt_tvb_offset_seed(tvbuff_t *tvb, guint offset, guint len,
+			    guint32 seed)
+{
+	const guint8* buf;
+
+	tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+	buf = tvb_get_ptr(tvb, offset, len);
+
+	return ( crc32_ccitt_seed(buf, len, seed) );
+}
+
+guint32
+crc32c_tvb_offset_calculate(tvbuff_t *tvb, guint offset, guint len, guint32 seed)
+{
+	const guint8* buf;
+
+	tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+	buf = tvb_get_ptr(tvb, offset, len);
+
+	return ( crc32c_calculate(buf, len, seed) );
+}
+
+/*
+ * IEEE 802.x version (Ethernet and 802.11, at least) - byte-swap
+ * the result of "crc32()".
+ *
+ * XXX - does this mean we should fetch the Ethernet and 802.11
+ * FCS with "tvb_get_letohl()" rather than "tvb_get_ntohl()",
+ * or is fetching it big-endian and byte-swapping the CRC done
+ * to cope with 802.x sending stuff out in reverse bit order?
+ */
+guint32
+crc32_802_tvb(tvbuff_t *tvb, guint len)
+{
+	guint32 c_crc;
+
+	c_crc = crc32_ccitt_tvb(tvb, len);
+
+	/* Byte reverse. */
+	c_crc = GUINT32_SWAP_LE_BE(c_crc);
+
+	return ( c_crc );
+}
+
+guint32
+crc32_mpeg2_tvb_offset_seed(tvbuff_t *tvb, guint offset,
+			    guint len, guint32 seed)
+{
+	const guint8* buf;
+
+	tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+	buf = tvb_get_ptr(tvb, offset, len);
+
+	return ( crc32_mpeg2_seed(buf, len, seed) );
+}
+
+guint32
+crc32_mpeg2_tvb(tvbuff_t *tvb, guint len)
+{
+	return ( crc32_mpeg2_tvb_offset_seed(tvb, 0, len, CRC32_MPEG2_SEED) );
+}
+
+guint32
+crc32_mpeg2_tvb_offset(tvbuff_t *tvb, guint offset, guint len)
+{
+	return ( crc32_mpeg2_tvb_offset_seed(tvb, offset, len, CRC32_MPEG2_SEED) );
+}
+
+guint32
+crc32_mpeg2_tvb_seed(tvbuff_t *tvb, guint len, guint32 seed)
+{
+	return ( crc32_mpeg2_tvb_offset_seed(tvb, 0, len, seed) );
+}
+
+guint32 crc32_0x0AA725CF_tvb_offset_seed(tvbuff_t *tvb,
+					 guint offset, guint len, guint32 seed)
+{
+	const guint8 *buf;
+
+	tvb_ensure_bytes_exist(tvb, offset, len);  /* len == -1 not allowed */
+	buf = tvb_get_ptr(tvb, offset, len);
+
+	return crc32_0x0AA725CF_seed(buf, len, seed);
+}
+
+/*
+ * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
+ *
+ * Local variables:
+ * c-basic-offset: 8
+ * tab-width: 8
+ * indent-tabs-mode: t
+ * End:
+ *
+ * vi: set shiftwidth=8 tabstop=8 noexpandtab:
+ * :indentSize=8:tabSize=8:noTabs=false:
+ */