655 lines
21 KiB
C
655 lines
21 KiB
C
/* file-png.c
|
|
*
|
|
* Routines for PNG (Portable Network Graphics) image file dissection
|
|
*
|
|
* Copyright 2006 Ronnie Sahlberg
|
|
*
|
|
* Wireshark - Network traffic analyzer
|
|
* By Gerald Combs <gerald@wireshark.org>
|
|
* Copyright 1998 Gerald Combs
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0-or-later
|
|
*/
|
|
/* See http://www.w3.org/TR/PNG for specification
|
|
*/
|
|
#include "config.h"
|
|
|
|
#include <epan/packet.h>
|
|
#include <epan/expert.h>
|
|
|
|
|
|
#define MAKE_TYPE_VAL(a, b, c, d) ((a)<<24 | (b)<<16 | (c)<<8 | (d))
|
|
|
|
#define CHUNK_TYPE_IHDR MAKE_TYPE_VAL('I', 'H', 'D', 'R')
|
|
#define CHUNK_TYPE_bKGD MAKE_TYPE_VAL('b', 'K', 'G', 'D')
|
|
#define CHUNK_TYPE_gAMA MAKE_TYPE_VAL('g', 'A', 'M', 'A')
|
|
#define CHUNK_TYPE_iCCP MAKE_TYPE_VAL('i', 'C', 'C', 'P')
|
|
#define CHUNK_TYPE_cHRM MAKE_TYPE_VAL('c', 'H', 'R', 'M')
|
|
#define CHUNK_TYPE_pHYs MAKE_TYPE_VAL('p', 'H', 'Y', 's')
|
|
#define CHUNK_TYPE_iTXt MAKE_TYPE_VAL('i', 'T', 'X', 't')
|
|
#define CHUNK_TYPE_tEXt MAKE_TYPE_VAL('t', 'E', 'X', 't')
|
|
#define CHUNK_TYPE_sBIT MAKE_TYPE_VAL('s', 'B', 'I', 'T')
|
|
#define CHUNK_TYPE_sRGB MAKE_TYPE_VAL('s', 'R', 'G', 'B')
|
|
#define CHUNK_TYPE_tIME MAKE_TYPE_VAL('t', 'I', 'M', 'E')
|
|
#define CHUNK_TYPE_IDAT MAKE_TYPE_VAL('I', 'D', 'A', 'T')
|
|
#define CHUNK_TYPE_IEND MAKE_TYPE_VAL('I', 'E', 'N', 'D')
|
|
#define CHUNK_TYPE_tRNS MAKE_TYPE_VAL('t', 'R', 'N', 'S')
|
|
#define CHUNK_TYPE_PLTE MAKE_TYPE_VAL('P', 'L', 'T', 'E')
|
|
|
|
static const value_string chunk_types[] = {
|
|
{ CHUNK_TYPE_IHDR, "Image Header" },
|
|
{ CHUNK_TYPE_bKGD, "Background colour" },
|
|
{ CHUNK_TYPE_gAMA, "Image gamma" },
|
|
{ CHUNK_TYPE_iCCP, "Embedded ICC profile" },
|
|
{ CHUNK_TYPE_cHRM, "Primary chromaticities and white point" },
|
|
{ CHUNK_TYPE_pHYs, "Physical pixel dimensions" },
|
|
{ CHUNK_TYPE_iTXt, "International textual data" },
|
|
{ CHUNK_TYPE_tEXt, "Textual data" },
|
|
{ CHUNK_TYPE_sBIT, "Significant bits" },
|
|
{ CHUNK_TYPE_sRGB, "Standard RGB colour space" },
|
|
{ CHUNK_TYPE_tIME, "Image last-modification time" },
|
|
{ CHUNK_TYPE_IDAT, "Image data chunk" },
|
|
{ CHUNK_TYPE_IEND, "Image Trailer" },
|
|
{ CHUNK_TYPE_tRNS, "Transparency" },
|
|
{ CHUNK_TYPE_PLTE, "Palette" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
|
|
void proto_register_png(void);
|
|
void proto_reg_handoff_png(void);
|
|
|
|
static const true_false_string png_chunk_anc = {
|
|
"This is an ANCILLARY chunk",
|
|
"This is a CRITICAL chunk"
|
|
};
|
|
|
|
static const true_false_string png_chunk_priv = {
|
|
"This is a PRIVATE chunk",
|
|
"This is a PUBLIC chunk"
|
|
};
|
|
|
|
static const true_false_string png_chunk_stc = {
|
|
"This chunk is SAFE TO COPY",
|
|
"This chunk is NOT safe to copy"
|
|
};
|
|
|
|
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 const value_string compression_method_vals[] = {
|
|
{ 0, "Deflate"},
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string filter_method_vals[] = {
|
|
{ 0, "Adaptive"},
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string interlace_method_vals[] = {
|
|
{ 0, "No interlace"},
|
|
{ 1, "Adam7"},
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string srgb_intent_vals[] = {
|
|
{ 0, "Perceptual" },
|
|
{ 1, "Relative colorimetric" },
|
|
{ 2, "Saturation" },
|
|
{ 3, "Absolute colorimetric" },
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static const value_string phys_unit_vals[] = {
|
|
{ 0, "Unit is unknown"},
|
|
{ 1, "Unit is METRE"},
|
|
{ 0, NULL }
|
|
};
|
|
|
|
static int proto_png;
|
|
|
|
static int hf_png_bkgd_blue;
|
|
static int hf_png_bkgd_green;
|
|
static int hf_png_bkgd_greyscale;
|
|
static int hf_png_bkgd_palette_index;
|
|
static int hf_png_bkgd_red;
|
|
static int hf_png_chrm_blue_x;
|
|
static int hf_png_chrm_blue_y;
|
|
static int hf_png_chrm_green_x;
|
|
static int hf_png_chrm_green_y;
|
|
static int hf_png_chrm_red_x;
|
|
static int hf_png_chrm_red_y;
|
|
static int hf_png_chrm_white_x;
|
|
static int hf_png_chrm_white_y;
|
|
static int hf_png_chunk_crc;
|
|
static int hf_png_chunk_data;
|
|
static int hf_png_chunk_flag_anc;
|
|
static int hf_png_chunk_flag_priv;
|
|
static int hf_png_chunk_flag_stc;
|
|
static int hf_png_chunk_len;
|
|
static int hf_png_chunk_type_str;
|
|
static int hf_png_gama_gamma;
|
|
static int hf_png_ihdr_bitdepth;
|
|
static int hf_png_ihdr_colour_type;
|
|
static int hf_png_ihdr_compression_method;
|
|
static int hf_png_ihdr_filter_method;
|
|
static int hf_png_ihdr_height;
|
|
static int hf_png_ihdr_interlace_method;
|
|
static int hf_png_ihdr_width;
|
|
static int hf_png_phys_horiz;
|
|
static int hf_png_phys_unit;
|
|
static int hf_png_phys_vert;
|
|
static int hf_png_signature;
|
|
static int hf_png_srgb_intent;
|
|
static int hf_png_text_keyword;
|
|
static int hf_png_text_string;
|
|
static int hf_png_time_day;
|
|
static int hf_png_time_hour;
|
|
static int hf_png_time_minute;
|
|
static int hf_png_time_month;
|
|
static int hf_png_time_second;
|
|
static int hf_png_time_year;
|
|
|
|
static gint ett_png;
|
|
static gint ett_png_chunk;
|
|
|
|
static expert_field ei_png_chunk_too_large;
|
|
|
|
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, hf_png_ihdr_width, tvb, 0, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_ihdr_height, tvb, 4, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_ihdr_bitdepth, tvb, 8, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_ihdr_colour_type, tvb, 9, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_ihdr_compression_method, tvb, 10, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_ihdr_filter_method, tvb, 11, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_ihdr_interlace_method, tvb, 12, 1, ENC_BIG_ENDIAN);
|
|
|
|
}
|
|
|
|
static void
|
|
dissect_png_srgb(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
proto_tree_add_item(tree, hf_png_srgb_intent,
|
|
tvb, 0, 1, ENC_BIG_ENDIAN);
|
|
}
|
|
|
|
static void
|
|
dissect_png_text(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
gint offset=0, nul_offset;
|
|
|
|
nul_offset = tvb_find_guint8(tvb, offset, tvb_captured_length_remaining(tvb, offset), 0);
|
|
/* nul_offset == 0 means empty keyword, this is not allowed by the png standard */
|
|
if (nul_offset<=0) {
|
|
/* XXX exception */
|
|
return;
|
|
}
|
|
|
|
proto_tree_add_item(tree, hf_png_text_keyword, tvb, offset, nul_offset, ENC_ISO_8859_1|ENC_NA);
|
|
offset = nul_offset+1; /* length of the key word + 0 character */
|
|
|
|
proto_tree_add_item(tree, hf_png_text_string, tvb, offset, tvb_captured_length_remaining(tvb, offset), ENC_ISO_8859_1|ENC_NA);
|
|
|
|
}
|
|
|
|
static void
|
|
dissect_png_time(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
proto_tree_add_item(tree, hf_png_time_year, tvb, 0, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_time_month, tvb, 2, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_time_day, tvb, 3, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_time_hour, tvb, 4, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_time_minute, tvb, 5, 1, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_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, hf_png_phys_horiz, tvb, 0, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_phys_vert, tvb, 4, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_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, hf_png_bkgd_palette_index, tvb, 0, 1, ENC_BIG_ENDIAN);
|
|
break;
|
|
case 2: /* colour type 0, 4 */
|
|
proto_tree_add_item(tree, hf_png_bkgd_greyscale, tvb, 0, 2, ENC_BIG_ENDIAN);
|
|
break;
|
|
case 6: /* colour type 2, 6 */
|
|
proto_tree_add_item(tree, hf_png_bkgd_red, tvb, 0, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_bkgd_green, tvb, 2, 2, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(tree, hf_png_bkgd_blue, tvb, 4, 2, ENC_BIG_ENDIAN);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
dissect_png_chrm(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
float wx, wy, rx, ry, gx, gy, bx, by;
|
|
gint offset = 0;
|
|
|
|
wx = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_white_x,
|
|
tvb, offset, 4, wx);
|
|
offset += 4;
|
|
|
|
wy = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_white_y,
|
|
tvb, offset, 4, wy);
|
|
offset += 4;
|
|
|
|
rx = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_red_x,
|
|
tvb, offset, 4, rx);
|
|
offset += 4;
|
|
|
|
ry = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_red_y,
|
|
tvb, offset, 4, ry);
|
|
offset += 4;
|
|
|
|
gx = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_green_x,
|
|
tvb, offset, 4, gx);
|
|
offset += 4;
|
|
|
|
gy = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_green_y,
|
|
tvb, offset, 4, gy);
|
|
offset += 4;
|
|
|
|
bx = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_blue_x,
|
|
tvb, offset, 4, bx);
|
|
offset += 4;
|
|
|
|
by = tvb_get_ntohl(tvb, offset) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_chrm_blue_y,
|
|
tvb, offset, 4, by);
|
|
}
|
|
|
|
static void
|
|
dissect_png_gama(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree)
|
|
{
|
|
float gamma;
|
|
|
|
gamma = tvb_get_ntohl(tvb, 0) / 100000.0f;
|
|
proto_tree_add_float(tree, hf_png_gama_gamma,
|
|
tvb, 0, 4, gamma);
|
|
}
|
|
|
|
static gint
|
|
dissect_png(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree, void *data _U_)
|
|
{
|
|
proto_tree *tree;
|
|
proto_item *ti;
|
|
gint 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_captured_length(tvb) < 20)
|
|
return 0;
|
|
if (tvb_memeql(tvb, 0, magic, sizeof(magic)) != 0)
|
|
return 0;
|
|
|
|
col_append_str(pinfo->cinfo, COL_INFO, " (PNG)");
|
|
|
|
ti=proto_tree_add_item(parent_tree, proto_png, tvb, offset, -1, ENC_NA);
|
|
tree=proto_item_add_subtree(ti, ett_png);
|
|
|
|
proto_tree_add_item(tree, hf_png_signature, tvb, offset, 8, ENC_NA);
|
|
offset+=8;
|
|
|
|
while(tvb_reported_length_remaining(tvb, offset) > 0){
|
|
guint32 len_field;
|
|
proto_item *len_it;
|
|
proto_tree *chunk_tree;
|
|
guint32 type;
|
|
guint8 *type_str;
|
|
tvbuff_t *chunk_tvb;
|
|
|
|
len_field = tvb_get_ntohl(tvb, offset);
|
|
|
|
type = tvb_get_ntohl(tvb, offset+4);
|
|
type_str = tvb_get_string_enc(pinfo->pool,
|
|
tvb, offset+4, 4, ENC_ASCII|ENC_NA);
|
|
|
|
/* 4 byte len field, 4 byte chunk type, 4 byte CRC */
|
|
chunk_tree = proto_tree_add_subtree_format(tree, tvb, offset, 4+4+len_field+4, ett_png_chunk, NULL,
|
|
"%s (%s)", val_to_str_const(type, chunk_types, "unknown"), type_str);
|
|
|
|
len_it = proto_tree_add_item(chunk_tree, hf_png_chunk_len,
|
|
tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset+=4;
|
|
if (len_field > G_MAXINT) {
|
|
expert_add_info(pinfo, len_it, &ei_png_chunk_too_large);
|
|
return offset;
|
|
}
|
|
|
|
proto_tree_add_item(chunk_tree, hf_png_chunk_type_str,
|
|
tvb, offset, 4, ENC_ASCII);
|
|
|
|
proto_tree_add_item(chunk_tree, hf_png_chunk_flag_anc, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_png_chunk_flag_priv, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
proto_tree_add_item(chunk_tree, hf_png_chunk_flag_stc, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset+=4;
|
|
|
|
chunk_tvb=tvb_new_subset_length(tvb, offset, len_field);
|
|
switch (type) {
|
|
case CHUNK_TYPE_IHDR:
|
|
dissect_png_ihdr(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
case CHUNK_TYPE_bKGD:
|
|
dissect_png_bkgd(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
case CHUNK_TYPE_cHRM:
|
|
dissect_png_chrm(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
case CHUNK_TYPE_gAMA:
|
|
dissect_png_gama(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
case CHUNK_TYPE_pHYs:
|
|
dissect_png_phys(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
case CHUNK_TYPE_sRGB:
|
|
dissect_png_srgb(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
case CHUNK_TYPE_tEXt:
|
|
dissect_png_text(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
case CHUNK_TYPE_tIME:
|
|
dissect_png_time(chunk_tvb, pinfo, chunk_tree);
|
|
break;
|
|
default:
|
|
if (len_field>0) {
|
|
proto_tree_add_item(chunk_tree, hf_png_chunk_data,
|
|
tvb, offset, len_field, ENC_NA);
|
|
}
|
|
break;
|
|
}
|
|
offset += len_field;
|
|
|
|
proto_tree_add_item(chunk_tree, hf_png_chunk_crc, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
offset+=4;
|
|
}
|
|
return offset;
|
|
}
|
|
|
|
void
|
|
proto_register_png(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_png_signature,
|
|
{ "PNG Signature", "png.signature",
|
|
FT_BYTES, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chunk_data,
|
|
{ "Data", "png.chunk.data",
|
|
FT_NONE, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chunk_type_str,
|
|
{ "Type", "png.chunk.type",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chunk_len,
|
|
{ "Len", "png.chunk.len",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chunk_crc,
|
|
{ "CRC", "png.chunk.crc",
|
|
FT_UINT32, BASE_HEX, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chunk_flag_anc,
|
|
{ "Ancillary", "png.chunk.flag.ancillary",
|
|
FT_BOOLEAN, 32, TFS(&png_chunk_anc), 0x20000000,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chunk_flag_priv,
|
|
{ "Private", "png.chunk.flag.private",
|
|
FT_BOOLEAN, 32, TFS(&png_chunk_priv), 0x00200000,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chunk_flag_stc,
|
|
{ "Safe To Copy", "png.chunk.flag.stc",
|
|
FT_BOOLEAN, 32, TFS(&png_chunk_stc), 0x00000020,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_ihdr_width,
|
|
{ "Width", "png.ihdr.width",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_ihdr_height,
|
|
{ "Height", "png.ihdr.height",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_ihdr_bitdepth,
|
|
{ "Bit Depth", "png.ihdr.bitdepth",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_ihdr_colour_type,
|
|
{ "Colour Type", "png.ihdr.colour_type",
|
|
FT_UINT8, BASE_DEC, VALS(colour_type_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_ihdr_compression_method,
|
|
{ "Compression Method", "png.ihdr.compression_method",
|
|
FT_UINT8, BASE_DEC, VALS(compression_method_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_ihdr_filter_method,
|
|
{ "Filter Method", "png.ihdr.filter_method",
|
|
FT_UINT8, BASE_DEC, VALS(filter_method_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_ihdr_interlace_method,
|
|
{ "Interlace Method", "png.ihdr.interlace_method",
|
|
FT_UINT8, BASE_DEC, VALS(interlace_method_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_srgb_intent,
|
|
{ "Intent", "png.srgb.intent",
|
|
FT_UINT8, BASE_DEC, VALS(srgb_intent_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_text_keyword,
|
|
{ "Keyword", "png.text.keyword",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_text_string,
|
|
{ "String", "png.text.string",
|
|
FT_STRING, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_time_year,
|
|
{ "Year", "png.time.year",
|
|
FT_UINT16, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_time_month,
|
|
{ "Month", "png.time.month",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_time_day,
|
|
{ "Day", "png.time.day",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_time_hour,
|
|
{ "Hour", "png.time.hour",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_time_minute,
|
|
{ "Minute", "png.time.minute",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_time_second,
|
|
{ "Second", "png.time.second",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_phys_horiz,
|
|
{ "Horizontal pixels per unit", "png.phys.horiz",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_phys_vert,
|
|
{ "Vertical pixels per unit", "png.phys.vert",
|
|
FT_UINT32, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_phys_unit,
|
|
{ "Unit", "png.phys.unit",
|
|
FT_UINT8, BASE_DEC, VALS(phys_unit_vals), 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_bkgd_palette_index,
|
|
{ "Palette Index", "png.bkgd.palette_index",
|
|
FT_UINT8, BASE_DEC, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_bkgd_greyscale,
|
|
{ "Greyscale", "png.bkgd.greyscale",
|
|
FT_UINT16, BASE_HEX, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_bkgd_red,
|
|
{ "Red", "png.bkgd.red",
|
|
FT_UINT16, BASE_HEX, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_bkgd_green,
|
|
{ "Green", "png.bkgd.green",
|
|
FT_UINT16, BASE_HEX, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_bkgd_blue,
|
|
{ "Blue", "png.bkgd.blue",
|
|
FT_UINT16, BASE_HEX, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_white_x,
|
|
{ "White X", "png.chrm.white.x",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_white_y,
|
|
{ "White Y", "png.chrm.white.y",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_red_x,
|
|
{ "Red X", "png.chrm.red.x",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_red_y,
|
|
{ "Red Y", "png.chrm.red.y",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_green_x,
|
|
{ "Green X", "png.chrm.green.x",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_green_y,
|
|
{ "Green Y", "png.chrm.green.y",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_blue_x,
|
|
{ "Blue X", "png.chrm.blue.x",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_chrm_blue_y,
|
|
{ "Blue Y", "png.chrm.blue.y",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
{ &hf_png_gama_gamma,
|
|
{ "Gamma", "png.gama.gamma",
|
|
FT_FLOAT, BASE_NONE, NULL, 0,
|
|
NULL, HFILL }
|
|
},
|
|
};
|
|
|
|
static gint *ett[] =
|
|
{
|
|
&ett_png,
|
|
&ett_png_chunk,
|
|
};
|
|
|
|
static ei_register_info ei[] = {
|
|
{ &ei_png_chunk_too_large,
|
|
{ "png.chunk_too_large", PI_PROTOCOL, PI_WARN,
|
|
"chunk size too large, dissection of this chunk is not supported", EXPFILL }}
|
|
};
|
|
expert_module_t *expert_png;
|
|
|
|
proto_png = proto_register_protocol("Portable Network Graphics","PNG","png");
|
|
proto_register_field_array(proto_png, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
expert_png = expert_register_protocol(proto_png);
|
|
expert_register_field_array(expert_png, ei, array_length(ei));
|
|
|
|
png_handle = 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, "PNG file in HTTP", "png_http", proto_png, HEURISTIC_ENABLE);
|
|
heur_dissector_add("wtap_file", dissect_png_heur, "PNG file in HTTP", "png_wtap", proto_png, HEURISTIC_ENABLE);
|
|
}
|
|
|
|
/*
|
|
* 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:
|
|
*/
|