MIME: Rename image dissectors to file dissectors.

Change-Id: Ie160733ceeed23ff96ddccfbf0ca2e7694789ff8

1 files changed, 480 insertions, 0 deletions

diff --git a/epan/dissectors/file-png.c b/epan/dissectors/file-png.c
new file mode 100644
index 0000000000..09431197e1
--- /dev/null
+++ b/epan/dissectors/file-png.c
@@ -0,0 +1,480 @@
+/* file-png.c
+ *
+ * Routines for PNG (Portable Network Graphics) image file dissection
+ *
+ * $Id$
+ *
+ * Copyright 2006 Ronnie Sahlberg
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+/* See http://www.w3.org/TR/PNG for specification
+ */
+
+#define NEW_PROTO_TREE_API
+
+#include "config.h"
+
+#include <glib.h>
+
+#include <epan/packet.h>
+#include <epan/exceptions.h>
+
+void proto_register_png(void);
+void proto_reg_handoff_png(void);
+
+static header_field_info *hfi_png = NULL;
+
+#define PNG_HFI_INIT HFI_INIT(proto_png)
+
+static header_field_info hfi_png_signature PNG_HFI_INIT = {
+	  "PNG Signature", "png.signature", FT_BYTES, BASE_NONE,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_chunk_data PNG_HFI_INIT = {
+	  "Data", "png.chunk.data", FT_NONE, BASE_NONE,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_chunk_type PNG_HFI_INIT = {
+	  "Chunk", "png.chunk.type", FT_STRING, BASE_NONE,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_chunk_len PNG_HFI_INIT = {
+	  "Len", "png.chunk.len", FT_UINT32, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_chunk_crc PNG_HFI_INIT = {
+	  "CRC", "png.chunk.crc", FT_UINT32, BASE_HEX,
+	  NULL, 0, NULL, HFILL };
+
+static const true_false_string png_chunk_anc = {
+	"This is an ANCILLARY chunk",
+	"This is a CRITICAL chunk"
+};
+
+static header_field_info hfi_png_chunk_flag_anc PNG_HFI_INIT = {
+	  "Ancillary", "png.chunk.flag.ancillary", FT_BOOLEAN, 32,
+	  TFS(&png_chunk_anc), 0x20000000, NULL, HFILL };
+
+static const true_false_string png_chunk_priv = {
+	"This is a PRIVATE chunk",
+	"This is a PUBLIC chunk"
+};
+
+static header_field_info hfi_png_chunk_flag_priv PNG_HFI_INIT = {
+	  "Private", "png.chunk.flag.private", FT_BOOLEAN, 32,
+	  TFS(&png_chunk_priv), 0x00200000, NULL, HFILL };
+
+static const true_false_string png_chunk_stc = {
+	"This chunk is SAFE TO COPY",
+	"This chunk is NOT safe to copy"
+};
+
+static header_field_info hfi_png_chunk_flag_stc PNG_HFI_INIT = {
+	  "Safe To Copy", "png.chunk.flag.stc", FT_BOOLEAN, 32,
+	  TFS(&png_chunk_stc), 0x00000020, NULL, HFILL };
+
+static header_field_info hfi_png_ihdr_width PNG_HFI_INIT = {
+	  "Width", "png.ihdr.width", FT_UINT32, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_ihdr_height PNG_HFI_INIT = {
+	  "Height", "png.ihdr.height", FT_UINT32, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_ihdr_bitdepth PNG_HFI_INIT = {
+	  "Bit Depth", "png.ihdr.bitdepth", FT_UINT8, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static const value_string colour_type_vals[] = {
+	{ 0,	"Greyscale"},
+	{ 2,	"Truecolour"},
+	{ 3,	"Indexed-colour"},
+	{ 4,	"Greyscale with alpha"},
+	{ 6,	"Truecolour with alpha"},
+	{ 0, NULL }
+};
+
+static header_field_info hfi_png_ihdr_colour_type PNG_HFI_INIT = {
+	  "Colour Type", "png.ihdr.colour_type", FT_UINT8, BASE_DEC,
+	  VALS(colour_type_vals), 0, NULL, HFILL };
+
+static const value_string compression_method_vals[] = {
+	{ 0,	"Deflate"},
+	{ 0, NULL }
+};
+
+static header_field_info hfi_png_ihdr_compression_method PNG_HFI_INIT = {
+	  "Compression Method", "png.ihdr.compression_method", FT_UINT8, BASE_DEC,
+	  VALS(compression_method_vals), 0, NULL, HFILL };
+
+static const value_string filter_method_vals[] = {
+	{ 0,	"Adaptive"},
+	{ 0, NULL }
+};
+
+static header_field_info hfi_png_ihdr_filter_method PNG_HFI_INIT = {
+	  "Filter Method", "png.ihdr.filter_method", FT_UINT8, BASE_DEC,
+	  VALS(filter_method_vals), 0, NULL, HFILL };
+
+static const value_string interlace_method_vals[] = {
+	{ 0,	"No interlace"},
+	{ 1,	"Adam7"},
+	{ 0, NULL }
+};
+
+static header_field_info hfi_png_ihdr_interlace_method PNG_HFI_INIT = {
+	  "Interlace Method", "png.ihdr.interlace_method", FT_UINT8, BASE_DEC,
+	  VALS(interlace_method_vals), 0, NULL, HFILL };
+
+static header_field_info hfi_png_text_keyword PNG_HFI_INIT = {
+	  "Keyword", "png.text.keyword", FT_STRING, BASE_NONE,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_text_string PNG_HFI_INIT = {
+	  "String", "png.text.string", FT_STRING, BASE_NONE,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_time_year PNG_HFI_INIT = {
+	  "Year", "png.time.year", FT_UINT16, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_time_month PNG_HFI_INIT = {
+	  "Month", "png.time.month", FT_UINT8, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_time_day PNG_HFI_INIT = {
+	  "Day", "png.time.day", FT_UINT8, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_time_hour PNG_HFI_INIT = {
+	  "Hour", "png.time.hour", FT_UINT8, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_time_minute PNG_HFI_INIT = {
+	  "Minute", "png.time.minute", FT_UINT8, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_time_second PNG_HFI_INIT = {
+	  "Second", "png.time.second", FT_UINT8, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_phys_horiz PNG_HFI_INIT = {
+	  "Horizontal pixels per unit", "png.phys.horiz", FT_UINT32, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_phys_vert PNG_HFI_INIT = {
+	  "Vertical pixels per unit", "png.phys.vert", FT_UINT32, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static const value_string phys_unit_vals[] = {
+	{ 0,	"Unit is unknown"},
+	{ 1,	"Unit is METRE"},
+	{ 0, NULL }
+};
+
+static header_field_info hfi_png_phys_unit PNG_HFI_INIT = {
+	  "Unit", "png.phys.unit", FT_UINT8, BASE_DEC,
+	  VALS(phys_unit_vals), 0, NULL, HFILL };
+
+static header_field_info hfi_png_bkgd_palette_index PNG_HFI_INIT = {
+	  "Palette Index", "png.bkgd.palette_index", FT_UINT8, BASE_DEC,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_bkgd_greyscale PNG_HFI_INIT = {
+	  "Greyscale", "png.bkgd.greyscale", FT_UINT16, BASE_HEX,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_bkgd_red PNG_HFI_INIT = {
+	  "Red", "png.bkgd.red", FT_UINT16, BASE_HEX,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_bkgd_green PNG_HFI_INIT = {
+	  "Green", "png.bkgd.green", FT_UINT16, BASE_HEX,
+	  NULL, 0, NULL, HFILL };
+
+static header_field_info hfi_png_bkgd_blue PNG_HFI_INIT = {
+	  "Blue", "png.bkgd.blue", FT_UINT16, BASE_HEX,
+	  NULL, 0, NULL, HFILL };
+
+static gint ett_png = -1;
+static gint ett_png_chunk = -1;
+static gint ett_png_chunk_item = -1;
+
+static dissector_handle_t png_handle;
+
+static void
+dissect_png_ihdr(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+
+	proto_tree_add_item(tree, &hfi_png_ihdr_width, tvb, 0, 4, ENC_BIG_ENDIAN);
+
+	proto_tree_add_item(tree, &hfi_png_ihdr_height, tvb, 4, 4, ENC_BIG_ENDIAN);
+
+	proto_tree_add_item(tree, &hfi_png_ihdr_bitdepth, tvb, 8, 1, ENC_BIG_ENDIAN);
+
+	proto_tree_add_item(tree, &hfi_png_ihdr_colour_type, tvb, 9, 1, ENC_BIG_ENDIAN);
+
+	proto_tree_add_item(tree, &hfi_png_ihdr_compression_method, tvb, 10, 1, ENC_BIG_ENDIAN);
+
+	proto_tree_add_item(tree, &hfi_png_ihdr_filter_method, tvb, 11, 1, ENC_BIG_ENDIAN);
+
+	proto_tree_add_item(tree, &hfi_png_ihdr_interlace_method, tvb, 12, 1, ENC_BIG_ENDIAN);
+
+}
+
+static void
+dissect_png_text(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+	int offset=1;
+
+	/* find the null that separates keyword and text string */
+	while(1){
+		if(!tvb_get_guint8(tvb, offset)){
+			break;
+		}
+		offset++;
+	}
+
+	proto_tree_add_item(tree, &hfi_png_text_keyword, tvb, 0, offset, ENC_ASCII|ENC_NA);
+	offset++;
+
+	proto_tree_add_item(tree, &hfi_png_text_string, tvb, offset, tvb_length_remaining(tvb, offset), ENC_ASCII|ENC_NA);
+
+}
+
+static void
+dissect_png_time(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+	proto_tree_add_item(tree, &hfi_png_time_year, tvb, 0, 2, ENC_BIG_ENDIAN);
+	proto_tree_add_item(tree, &hfi_png_time_month, tvb, 2, 1, ENC_BIG_ENDIAN);
+	proto_tree_add_item(tree, &hfi_png_time_day, tvb, 3, 1, ENC_BIG_ENDIAN);
+	proto_tree_add_item(tree, &hfi_png_time_hour, tvb, 4, 1, ENC_BIG_ENDIAN);
+	proto_tree_add_item(tree, &hfi_png_time_minute, tvb, 5, 1, ENC_BIG_ENDIAN);
+	proto_tree_add_item(tree, &hfi_png_time_second, tvb, 6, 1, ENC_BIG_ENDIAN);
+}
+
+static void
+dissect_png_phys(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+	proto_tree_add_item(tree, &hfi_png_phys_horiz, tvb, 0, 4, ENC_BIG_ENDIAN);
+	proto_tree_add_item(tree, &hfi_png_phys_vert, tvb, 4, 4, ENC_BIG_ENDIAN);
+	proto_tree_add_item(tree, &hfi_png_phys_unit, tvb, 8, 1, ENC_BIG_ENDIAN);
+}
+
+static void
+dissect_png_bkgd(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
+{
+	switch(tvb_reported_length(tvb)){
+	case 1: /* colour type 3 */
+		proto_tree_add_item(tree, &hfi_png_bkgd_palette_index, tvb, 0, 1, ENC_BIG_ENDIAN);
+		break;
+	case 2: /* colour type 0, 4 */
+		proto_tree_add_item(tree, &hfi_png_bkgd_greyscale, tvb, 0, 2, ENC_BIG_ENDIAN);
+		break;
+	case 6: /* colour type 2, 6 */
+		proto_tree_add_item(tree, &hfi_png_bkgd_red, tvb, 0, 2, ENC_BIG_ENDIAN);
+		proto_tree_add_item(tree, &hfi_png_bkgd_green, tvb, 2, 2, ENC_BIG_ENDIAN);
+		proto_tree_add_item(tree, &hfi_png_bkgd_blue, tvb, 4, 2, ENC_BIG_ENDIAN);
+		break;
+	}
+}
+
+typedef struct _chunk_dissector_t {
+	guint32 type;
+	const char *name;
+	void (*dissector)(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
+} chunk_dissector_t;
+
+static chunk_dissector_t chunk_table[] = {
+	{ 0x49484452, "Image Header", dissect_png_ihdr }, 	/* IHDR */
+	{ 0x624b4744, "Background colour", dissect_png_bkgd }, 	/* bKGD */
+	{ 0x70485973, "Physical pixel dimensions",
+					dissect_png_phys }, 	/* pHYs */
+	{ 0x74455874, "Textual data", dissect_png_text }, 	/* tEXt */
+	{ 0x74494d45, "Image last-modification time",
+					dissect_png_time }, 	/* tIME */
+	{ 0x49454e44, "Image Trailer", NULL }, 			/* IEND */
+	{ 0, NULL, NULL }
+};
+
+static gint
+dissect_png(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
+{
+	proto_tree *tree = NULL;
+	proto_item *ti;
+	int offset=0;
+
+	/* http://libpng.org/pub/png/spec/1.2/PNG-Structure.html#PNG-file-signature */
+	static const guint8 magic[8] = { 137, 80, 78, 71, 13, 10, 26, 10 };
+	if (tvb_length(tvb) < 20)
+		return 0;
+
+	if (tvb_memeql(tvb, 0, magic, sizeof(magic)) != 0)
+		return 0;
+
+	col_append_str(pinfo->cinfo, COL_INFO, " (PNG)");
+
+	if(parent_tree){
+		ti=proto_tree_add_item(parent_tree, hfi_png, tvb, offset, -1, ENC_NA);
+		tree=proto_item_add_subtree(ti, ett_png);
+	}
+
+	proto_tree_add_item(tree, &hfi_png_signature, tvb, offset, 8, ENC_NA);
+	offset+=8;
+
+	while(tvb_reported_length_remaining(tvb, offset) > 0){
+		proto_tree *chunk_tree=NULL;
+		proto_item *it=NULL;
+		guint32 len, type;
+		chunk_dissector_t *cd;
+		char str[5];
+
+		len=tvb_get_ntohl(tvb, offset);
+		type=tvb_get_ntohl(tvb, offset+4);
+		str[0]=tvb_get_guint8(tvb, offset+4);
+		str[1]=tvb_get_guint8(tvb, offset+5);
+		str[2]=tvb_get_guint8(tvb, offset+6);
+		str[3]=tvb_get_guint8(tvb, offset+7);
+		str[4]=0;
+
+		if(tree){
+			it=proto_tree_add_text(tree, tvb, offset, offset+8+len+4, "%s", str);
+			chunk_tree=proto_item_add_subtree(it, ett_png_chunk);
+		}
+
+		proto_tree_add_item(chunk_tree, &hfi_png_chunk_len, tvb, offset, 4, ENC_BIG_ENDIAN);
+		offset+=4;
+
+
+		it=proto_tree_add_item(chunk_tree, &hfi_png_chunk_type, tvb, offset, 4, ENC_ASCII|ENC_NA);
+		proto_tree_add_item(chunk_tree, &hfi_png_chunk_flag_anc, tvb, offset, 4, ENC_BIG_ENDIAN);
+		proto_tree_add_item(chunk_tree, &hfi_png_chunk_flag_priv, tvb, offset, 4, ENC_BIG_ENDIAN);
+		proto_tree_add_item(chunk_tree, &hfi_png_chunk_flag_stc, tvb, offset, 4, ENC_BIG_ENDIAN);
+		offset+=4;
+
+		if (len >= 1000000000)
+			THROW(ReportedBoundsError);
+		cd=&chunk_table[0];
+		while(1){
+			if(cd->type==0){
+				cd=NULL;
+				break;
+			}
+			if(cd->type==type){
+				break;
+			}
+			cd++;
+		}
+		if(chunk_tree){
+			proto_item_append_text(chunk_tree, " %s", cd?cd->name:"(don't know how to dissect this)");
+		}
+
+		if(!cd){
+			proto_tree_add_item(chunk_tree, &hfi_png_chunk_data, tvb, offset, len, ENC_NA);
+		} else {
+			if(cd->dissector){
+				tvbuff_t *next_tvb;
+				proto_tree *cti=NULL;
+
+				next_tvb=tvb_new_subset(tvb, offset, MIN(tvb_length_remaining(tvb, offset), (int)len), len);
+				if(it){
+					cti=proto_item_add_subtree(it, ett_png_chunk_item);
+				}
+				cd->dissector(next_tvb, pinfo, cti);
+			}
+		}
+		offset+=len;
+
+		proto_tree_add_item(chunk_tree, &hfi_png_chunk_crc, tvb, offset, 4, ENC_BIG_ENDIAN);
+		offset+=4;
+	}
+	return offset;
+}
+
+void
+proto_register_png(void)
+{
+#ifndef HAVE_HFI_SECTION_INIT
+	static header_field_info *hfi[] =
+	{
+		&hfi_png_signature,
+		&hfi_png_chunk_type,
+		&hfi_png_chunk_data,
+		&hfi_png_chunk_len,
+		&hfi_png_chunk_crc,
+		&hfi_png_chunk_flag_anc,
+		&hfi_png_chunk_flag_priv,
+		&hfi_png_chunk_flag_stc,
+		&hfi_png_ihdr_width,
+		&hfi_png_ihdr_height,
+		&hfi_png_ihdr_bitdepth,
+		&hfi_png_ihdr_colour_type,
+		&hfi_png_ihdr_compression_method,
+		&hfi_png_ihdr_filter_method,
+		&hfi_png_ihdr_interlace_method,
+		&hfi_png_text_keyword,
+		&hfi_png_text_string,
+		&hfi_png_time_year,
+		&hfi_png_time_month,
+		&hfi_png_time_day,
+		&hfi_png_time_hour,
+		&hfi_png_time_minute,
+		&hfi_png_time_second,
+		&hfi_png_phys_horiz,
+		&hfi_png_phys_vert,
+		&hfi_png_phys_unit,
+		&hfi_png_bkgd_palette_index,
+		&hfi_png_bkgd_greyscale,
+		&hfi_png_bkgd_red,
+		&hfi_png_bkgd_green,
+		&hfi_png_bkgd_blue,
+	};
+#endif
+
+	static gint *ett[] =
+	{
+		&ett_png,
+		&ett_png_chunk,
+		&ett_png_chunk_item,
+	};
+
+	int proto_png;
+
+	proto_png = proto_register_protocol("Portable Network Graphics","PNG","png");
+	hfi_png = proto_registrar_get_nth(proto_png);
+
+	proto_register_fields(proto_png, hfi, array_length(hfi));
+	proto_register_subtree_array(ett, array_length(ett));
+
+	png_handle = new_register_dissector("png", dissect_png, proto_png);
+}
+
+static gboolean dissect_png_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+	return dissect_png(tvb, pinfo, tree, NULL) > 0;
+}
+
+void
+proto_reg_handoff_png(void)
+{
+	dissector_add_string("media_type", "image/png", png_handle);
+	heur_dissector_add("http", dissect_png_heur, hfi_png->id);
+	heur_dissector_add("wtap_file", dissect_png_heur, hfi_png->id);
+}