Adding upstream version 4.2.2.upstream/4.2.2

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

1 files changed, 259 insertions, 0 deletions

diff --git a/epan/dissectors/packet-h261.c b/epan/dissectors/packet-h261.c
new file mode 100644
index 00000000..cfd1f410
--- /dev/null
+++ b/epan/dissectors/packet-h261.c
@@ -0,0 +1,259 @@
+/* packet-h261.c
+ *
+ * Routines for ITU-T Recommendation H.261 dissection
+ *
+ * Copyright 2000, Philips Electronics N.V.
+ * Andreas Sikkema <h323@ramdyne.nl>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * This dissector tries to dissect the H.261 protocol according to Annex C
+ * of ITU-T Recommendation H.225.0 (02/98)
+ */
+
+
+#include "config.h"
+
+#include <epan/packet.h>
+
+#include <epan/rtp_pt.h>
+#include <epan/iax2_codec_type.h>
+
+void proto_register_h261(void);
+void proto_reg_handoff_h261(void);
+
+static dissector_handle_t h261_handle;
+
+/* H.261 header fields             */
+static int proto_h261          = -1;
+static int hf_h261_sbit        = -1;
+static int hf_h261_ebit        = -1;
+static int hf_h261_ibit        = -1;
+static int hf_h261_vbit        = -1;
+static int hf_h261_gobn        = -1;
+static int hf_h261_mbap        = -1;
+static int hf_h261_quant       = -1;
+static int hf_h261_hmvd        = -1; /* Mislabeled in a figure in section C.3.1 as HMDV */
+static int hf_h261_vmvd        = -1;
+static int hf_h261_data        = -1;
+
+/* H.261 fields defining a sub tree */
+static gint ett_h261           = -1;
+
+static int
+dissect_h261( tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_ )
+{
+	proto_item *ti            = NULL;
+	proto_tree *h261_tree     = NULL;
+	unsigned int offset       = 0;
+	static int * const bits[] = {
+		/* SBIT 1st octet, 3 bits */
+		&hf_h261_sbit,
+		/* EBIT 1st octet, 3 bits */
+		&hf_h261_ebit,
+		/* I flag, 1 bit */
+		&hf_h261_ibit,
+		/* V flag, 1 bit */
+		&hf_h261_vbit,
+		NULL
+	};
+
+	col_set_str(pinfo->cinfo, COL_PROTOCOL, "H.261");
+
+	col_set_str(pinfo->cinfo, COL_INFO, "H.261 message");
+
+	ti = proto_tree_add_item( tree, proto_h261, tvb, offset, -1, ENC_NA);
+	h261_tree = proto_item_add_subtree( ti, ett_h261 );
+
+	proto_tree_add_bitmask_list(h261_tree, tvb, offset, 1, bits, ENC_NA);
+	offset++;
+
+	/* GOBN 2nd octet, 4 bits */
+	proto_tree_add_item( h261_tree, hf_h261_gobn, tvb, offset, 1, ENC_NA);
+	/* MBAP 2nd octet, 4 bits, 3rd octet 1 bit */
+	proto_tree_add_item( h261_tree, hf_h261_mbap, tvb, offset, 2, ENC_BIG_ENDIAN);
+	offset++;
+
+	/* QUANT 3rd octet, 5 bits (starting at bit 2!) */
+	proto_tree_add_item( h261_tree, hf_h261_quant, tvb, offset, 1, ENC_NA);
+
+	/* HMVD 3rd octet 2 bits, 4th octet 3 bits */
+	proto_tree_add_item( h261_tree, hf_h261_hmvd, tvb, offset, 2, ENC_BIG_ENDIAN);
+	offset++;
+
+	/* VMVD 4th octet, last 5 bits */
+	proto_tree_add_item( h261_tree, hf_h261_vmvd, tvb, offset, 1, ENC_NA);
+	offset++;
+
+	/* The rest of the packet is the H.261 stream */
+	proto_tree_add_item( h261_tree, hf_h261_data, tvb, offset, -1, ENC_NA);
+
+	return tvb_captured_length(tvb);
+}
+
+void
+proto_register_h261(void)
+{
+	static hf_register_info hf[] =
+	{
+		{
+			&hf_h261_sbit,
+			{
+				"Start bit position",
+				"h261.sbit",
+				FT_UINT8,
+				BASE_DEC,
+				NULL,
+				0xe0,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_ebit,
+			{
+				"End bit position",
+				"h261.ebit",
+				FT_UINT8,
+				BASE_DEC,
+				NULL,
+				0x1c,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_ibit,
+			{
+				"Intra frame encoded data flag",
+				"h261.i",
+				FT_BOOLEAN,
+				8,
+				NULL,
+				0x02,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_vbit,
+			{
+				"Motion vector flag",
+				"h261.v",
+				FT_BOOLEAN,
+				8,
+				NULL,
+				0x01,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_gobn,
+			{
+				"GOB Number",
+				"h261.gobn",
+				FT_UINT8,
+				BASE_DEC,
+				NULL,
+				0xF0,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_mbap,
+			{
+				"Macroblock address predictor",
+				"h261.mbap",
+				FT_UINT16,
+				BASE_DEC,
+				NULL,
+				0x0F80,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_quant,
+			{
+				"Quantizer",
+				"h261.quant",
+				FT_UINT8,
+				BASE_DEC,
+				NULL,
+				0x7C,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_hmvd,
+			{
+				"Horizontal motion vector data",
+				"h261.hmvd",
+				FT_UINT16,
+				BASE_DEC,
+				NULL,
+				0x03E0,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_vmvd,
+			{
+				"Vertical motion vector data",
+				"h261.vmvd",
+				FT_UINT8,
+				BASE_DEC,
+				NULL,
+				0x0,
+				NULL, HFILL
+			}
+		},
+		{
+			&hf_h261_data,
+			{
+				"H.261 stream",
+				"h261.stream",
+				FT_BYTES,
+				BASE_NONE,
+				NULL,
+				0x0,
+				NULL, HFILL
+			}
+		},
+};
+
+	static gint *ett[] =
+	{
+		&ett_h261,
+	};
+
+
+	proto_h261 = proto_register_protocol("ITU-T Recommendation H.261",
+	    "H.261", "h261");
+	proto_register_field_array(proto_h261, hf, array_length(hf));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	h261_handle = register_dissector("h261", dissect_h261, proto_h261);
+}
+
+void
+proto_reg_handoff_h261(void)
+{
+	dissector_add_uint("rtp.pt", PT_H261, h261_handle);
+	dissector_add_uint("iax2.codec", AST_FORMAT_H261, h261_handle);
+}
+
+/*
+ * 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:
+ */