nexmon – Rev 1
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/* file-jpeg.c
*
* Routines for JFIF image/jpeg media dissection
* Copyright 2004, Olivier Biot.
*
* Refer to the AUTHORS file or the AUTHORS section in the man page
* for contacting the author(s) of this file.
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* JFIF media decoding functionality provided by Olivier Biot.
*
* The JFIF specifications are found at several locations, such as:
* http://www.jpeg.org/public/jfif.pdf
* http://www.w3.org/Graphics/JPEG/itu-t81.pdf
*
* The Exif specifications are found at several locations, such as:
* http://www.exif.org/
*
* 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.
*/
#include "config.h"
#include <epan/packet.h>
#include <epan/expert.h>
#include <wiretap/wtap.h>
void proto_register_jfif(void);
void proto_reg_handoff_jfif(void);
/* General-purpose debug logger.
* Requires double parentheses because of variable arguments of printf().
*
* Enable debug logging for JFIF by defining AM_CFLAGS
* so that it contains "-DDEBUG_image_jfif" or "-DDEBUG_image"
*/
#if (defined(DEBUG_image_jfif) || defined(DEBUG_image))
#define DebugLog(x) \
g_print("%s:%u: ", __FILE__, __LINE__); \
g_print x
#else
#define DebugLog(x) ;
#endif
#define IMG_JFIF "image-jfif"
/************************** Variable declarations **************************/
#define MARKER_TEM 0xFF01
/* 0xFF02 -- 0xFFBF are reserved */
#define MARKER_SOF0 0xFFC0
#define MARKER_SOF1 0xFFC1
#define MARKER_SOF2 0xFFC2
#define MARKER_SOF3 0xFFC3
#define MARKER_DHT 0xFFC4
#define MARKER_SOF5 0xFFC5
#define MARKER_SOF6 0xFFC6
#define MARKER_SOF7 0xFFC7
#define MARKER_SOF8 0xFFC8
#define MARKER_SOF9 0xFFC9
#define MARKER_SOF10 0xFFCA
#define MARKER_SOF11 0xFFCB
#define MARKER_DAC 0xFFCC
#define MARKER_SOF13 0xFFCD
#define MARKER_SOF14 0xFFCE
#define MARKER_SOF15 0xFFCF
#define MARKER_RST0 0xFFD0
#define MARKER_RST1 0xFFD1
#define MARKER_RST2 0xFFD2
#define MARKER_RST3 0xFFD3
#define MARKER_RST4 0xFFD4
#define MARKER_RST5 0xFFD5
#define MARKER_RST6 0xFFD6
#define MARKER_RST7 0xFFD7
#define MARKER_SOI 0xFFD8
#define MARKER_EOI 0xFFD9
#define MARKER_SOS 0xFFDA
#define MARKER_DQT 0xFFDB
#define MARKER_DNL 0xFFDC
#define MARKER_DRI 0xFFDD
#define MARKER_DHP 0xFFDE
#define MARKER_EXP 0xFFDF
#define MARKER_APP0 0xFFE0
#define MARKER_APP1 0xFFE1
#define MARKER_APP2 0xFFE2
#define MARKER_APP3 0xFFE3
#define MARKER_APP4 0xFFE4
#define MARKER_APP5 0xFFE5
#define MARKER_APP6 0xFFE6
#define MARKER_APP7 0xFFE7
#define MARKER_APP8 0xFFE8
#define MARKER_APP9 0xFFE9
#define MARKER_APP10 0xFFEA
#define MARKER_APP11 0xFFEB
#define MARKER_APP12 0xFFEC
#define MARKER_APP13 0xFFED
#define MARKER_APP14 0xFFEE
#define MARKER_APP15 0xFFEF
#define MARKER_JPG0 0xFFF0
#define MARKER_JPG1 0xFFF1
#define MARKER_JPG2 0xFFF2
#define MARKER_JPG3 0xFFF3
#define MARKER_JPG4 0xFFF4
#define MARKER_JPG5 0xFFF5
#define MARKER_JPG6 0xFFF6
#define MARKER_JPG7 0xFFF7
#define MARKER_JPG8 0xFFF8
#define MARKER_JPG9 0xFFF9
#define MARKER_JPG10 0xFFFA
#define MARKER_JPG11 0xFFFB
#define MARKER_JPG12 0xFFFC
#define MARKER_JPG13 0xFFFD
#define MARKER_COM 0xFFFE
#define marker_has_length(marker) ( ! ( \
((marker) == MARKER_TEM) \
|| ((marker) == MARKER_SOI) \
|| ((marker) == MARKER_EOI) \
|| ( ((marker) >= MARKER_RST0) && ((marker) <= MARKER_RST7) ) \
) )
static const value_string vals_marker[] = {
{ MARKER_TEM, "Reserved - For temporary private use in arithmetic coding" },
{ MARKER_SOF0, "Start of Frame (non-differential, Huffman coding) - Baseline DCT" },
{ MARKER_SOF1, "Start of Frame (non-differential, Huffman coding) - Extended sequential DCT" },
{ MARKER_SOF2, "Start of Frame (non-differential, Huffman coding) - Progressive DCT" },
{ MARKER_SOF3, "Start of Frame (non-differential, Huffman coding) - Lossless (sequential)" },
{ MARKER_DHT, "Define Huffman table(s)" },
{ MARKER_SOF5, "Start of Frame (differential, Huffman coding) - Differential sequential DCT" },
{ MARKER_SOF6, "Start of Frame (differential, Huffman coding) - Differential progressive DCT" },
{ MARKER_SOF7, "Start of Frame (differential, Huffman coding) - Differential lossless (sequential)" },
{ MARKER_SOF8, "Start of Frame (non-differential, arithmetic coding) - Reserved for JPEG extensions" },
{ MARKER_SOF9, "Start of Frame (non-differential, arithmetic coding) - Extended sequential DCT" },
{ MARKER_SOF10, "Start of Frame (non-differential, arithmetic coding) - Progressive DCT" },
{ MARKER_SOF11, "Start of Frame (non-differential, arithmetic coding) - Lossless (sequential)" },
{ MARKER_DAC, "Define arithmetic coding conditioning(s)" },
{ MARKER_SOF13, "Start of Frame (differential, arithmetic coding) - Differential sequential DCT" },
{ MARKER_SOF14, "Start of Frame (differential, arithmetic coding) - Differential progressive DCT" },
{ MARKER_SOF15, "Start of Frame (differential, arithmetic coding) - Differential lossless (sequential)" },
{ MARKER_RST0, "Restart interval termination - Restart with modulo 8 count 0" },
{ MARKER_RST1, "Restart interval termination - Restart with modulo 8 count 1" },
{ MARKER_RST2, "Restart interval termination - Restart with modulo 8 count 2" },
{ MARKER_RST3, "Restart interval termination - Restart with modulo 8 count 3" },
{ MARKER_RST4, "Restart interval termination - Restart with modulo 8 count 4" },
{ MARKER_RST5, "Restart interval termination - Restart with modulo 8 count 5" },
{ MARKER_RST6, "Restart interval termination - Restart with modulo 8 count 6" },
{ MARKER_RST7, "Restart interval termination - Restart with modulo 8 count 7" },
{ MARKER_SOI, "Start of Image" },
{ MARKER_EOI, "End of Image" },
{ MARKER_SOS, "Start of Scan" },
{ MARKER_DQT, "Define quantization table(s)" },
{ MARKER_DNL, "Define number of lines" },
{ MARKER_DRI, "Define restart interval" },
{ MARKER_DHP, "Define hierarchical progression" },
{ MARKER_EXP, "Expand reference component(s)" },
{ MARKER_APP0, "Reserved for application segments - 0" },
{ MARKER_APP1, "Reserved for application segments - 1" },
{ MARKER_APP2, "Reserved for application segments - 2" },
{ MARKER_APP3, "Reserved for application segments - 3" },
{ MARKER_APP4, "Reserved for application segments - 4" },
{ MARKER_APP5, "Reserved for application segments - 5" },
{ MARKER_APP6, "Reserved for application segments - 6" },
{ MARKER_APP7, "Reserved for application segments - 7" },
{ MARKER_APP8, "Reserved for application segments - 8" },
{ MARKER_APP9, "Reserved for application segments - 9" },
{ MARKER_APP10, "Reserved for application segments - 10" },
{ MARKER_APP11, "Reserved for application segments - 11" },
{ MARKER_APP12, "Reserved for application segments - 12" },
{ MARKER_APP13, "Reserved for application segments - 13" },
{ MARKER_APP14, "Reserved for application segments - 14" },
{ MARKER_APP15, "Reserved for application segments - 15" },
{ MARKER_JPG0, "Reserved for JPEG extensions - 0" },
{ MARKER_JPG1, "Reserved for JPEG extensions - 1" },
{ MARKER_JPG2, "Reserved for JPEG extensions - 2" },
{ MARKER_JPG3, "Reserved for JPEG extensions - 3" },
{ MARKER_JPG4, "Reserved for JPEG extensions - 4" },
{ MARKER_JPG5, "Reserved for JPEG extensions - 5" },
{ MARKER_JPG6, "Reserved for JPEG extensions - 6" },
{ MARKER_JPG7, "Reserved for JPEG extensions - 7" },
{ MARKER_JPG8, "Reserved for JPEG extensions - 8" },
{ MARKER_JPG9, "Reserved for JPEG extensions - 9" },
{ MARKER_JPG10, "Reserved for JPEG extensions - 10" },
{ MARKER_JPG11, "Reserved for JPEG extensions - 11" },
{ MARKER_JPG12, "Reserved for JPEG extensions - 12" },
{ MARKER_JPG13, "Reserved for JPEG extensions - 13" },
{ MARKER_COM, "Comment" },
{ 0x00, NULL }
};
static const value_string vals_units[] = {
{ 0, "No units; Xdensity and Ydensity specify the pixel aspect ratio" },
{ 1, "Dots per inch" },
{ 2, "Dots per centimeter" },
{ 0x00, NULL }
};
static const value_string vals_extension_code[] = {
{ 0x10, "Thumbnail encoded using JPEG" },
{ 0x11, "Thumbnail encoded using 1 byte (8 bits) per pixel" },
{ 0x13, "Thumbnail encoded using 3 bytes (24 bits) per pixel" },
{ 0x00, NULL }
};
static const value_string vals_exif_tags[] = {
/*
* Tags related to image data structure:
*/
{ 0x0100, "ImageWidth" },
{ 0x0101, "ImageLength" },
{ 0x0102, "BitsPerSample" },
{ 0x0103, "Compression" },
{ 0x0106, "PhotometricInterpretation" },
{ 0x0112, "Orientation" },
{ 0x0115, "SamplesPerPixel" },
{ 0x011C, "PlanarConfiguration" },
{ 0x0212, "YCbCrSubSampling" },
{ 0x0213, "YCbCrPositioning" },
{ 0x011A, "XResolution" },
{ 0x011B, "YResolution" },
{ 0x0128, "ResolutionUnit" },
/*
* Tags relating to recording offset:
*/
{ 0x0111, "StripOffsets" },
{ 0x0116, "RowsPerStrip" },
{ 0x0117, "StripByteCounts" },
{ 0x0201, "JPEGInterchangeFormat" },
{ 0x0202, "JPEGInterchangeFormatLength" },
/*
* Tags relating to image data characteristics:
*/
{ 0x012D, "TransferFunction" },
{ 0x013E, "WhitePoint" },
{ 0x013F, "PrimaryChromaticities" },
{ 0x0211, "YCbCrCoefficients" },
{ 0x0214, "ReferenceBlackWhite" },
/*
* Other tags:
*/
{ 0x0132, "DateTime" },
{ 0x010E, "ImageDescription" },
{ 0x010F, "Make" },
{ 0x0110, "Model" },
{ 0x0131, "Software" },
{ 0x013B, "Artist" },
{ 0x8296, "Copyright" },
/*
* Exif-specific IFD:
*/
{ 0x8769, "Exif IFD Pointer"},
{ 0x8825, "GPS IFD Pointer"},
{ 0xA005, "Interoperability IFD Pointer"},
{ 0x0000, NULL }
};
static const value_string vals_exif_types[] = {
{ 0x0001, "BYTE" },
{ 0x0002, "ASCII" },
{ 0x0003, "SHORT" },
{ 0x0004, "LONG" },
{ 0x0005, "RATIONAL" },
/* 0x0006 */
{ 0x0007, "UNDEFINED" },
/* 0x0008 */
{ 0x0009, "SLONG" },
{ 0x000A, "SRATIONAL" },
{ 0x0000, NULL }
};
/* Initialize the protocol and registered fields */
static int proto_jfif = -1;
/* Marker */
static gint hf_marker = -1;
/* Marker segment */
static gint hf_marker_segment = -1;
static gint hf_len = -1;
/* MARKER_APP0 */
static gint hf_identifier = -1;
/* MARKER_APP0 - JFIF */
static gint hf_version = -1;
static gint hf_version_major = -1;
static gint hf_version_minor = -1;
static gint hf_units = -1;
static gint hf_xdensity = -1;
static gint hf_ydensity = -1;
static gint hf_xthumbnail = -1;
static gint hf_ythumbnail = -1;
static gint hf_rgb = -1;
/* MARKER_APP0 - JFXX */
static gint hf_extension_code = -1;
/* start of Frame */
static gint hf_sof_header = -1;
static gint hf_sof_precision = -1;
static gint hf_sof_lines = -1;
static gint hf_sof_samples_per_line = -1;
static gint hf_sof_nf = -1;
static gint hf_sof_c_i = -1;
static gint hf_sof_h_i = -1;
static gint hf_sof_v_i = -1;
static gint hf_sof_tq_i = -1;
/* Start of Scan */
static gint hf_sos_header = -1;
static gint hf_sos_ns = -1;
static gint hf_sos_cs_j = -1;
static gint hf_sos_td_j = -1;
static gint hf_sos_ta_j = -1;
static gint hf_sos_ss = -1;
static gint hf_sos_se = -1;
static gint hf_sos_ah = -1;
static gint hf_sos_al = -1;
/* Comment */
static gint hf_comment_header = -1;
static gint hf_comment = -1;
static gint hf_remain_seg_data = -1;
static gint hf_endianness = -1;
static gint hf_start_ifd_offset = -1;
static gint hf_next_ifd_offset = -1;
static gint hf_exif_flashpix_marker = -1;
static gint hf_entropy_coded_segment = -1;
static gint hf_fill_bytes = -1;
static gint hf_skipped_tiff_data = -1;
static gint hf_ifd_num_fields = -1;
static gint hf_idf_tag = -1;
static gint hf_idf_type = -1;
static gint hf_idf_count = -1;
static gint hf_idf_offset = -1;
/* Initialize the subtree pointers */
static gint ett_jfif = -1;
static gint ett_marker_segment = -1;
static gint ett_details = -1;
static expert_field ei_file_jpeg_first_identifier_not_jfif = EI_INIT;
static expert_field ei_start_ifd_offset = EI_INIT;
static expert_field ei_next_ifd_offset = EI_INIT;
/****************** JFIF protocol dissection functions ******************/
/*
* Process a marker segment (with length).
*/
static void
process_marker_segment(proto_tree *tree, tvbuff_t *tvb, guint32 len,
guint16 marker, const char *marker_name)
{
proto_item *ti;
proto_tree *subtree;
if (!tree)
return;
ti = proto_tree_add_item(tree, hf_marker_segment,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_marker_segment);
proto_item_append_text(ti, ": %s (0x%04X)", marker_name, marker);
proto_tree_add_item(subtree, hf_marker, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_len, tvb, 2, 2, ENC_BIG_ENDIAN);
proto_tree_add_bytes_format_value(subtree, hf_remain_seg_data, tvb, 4, -1, NULL, "%u bytes", len - 2);
}
/*
* Process a Start of Frame header (with length).
*/
static void
process_sof_header(proto_tree *tree, tvbuff_t *tvb, guint32 len _U_,
guint16 marker, const char *marker_name)
{
proto_item *ti;
proto_tree *subtree;
guint8 count;
guint32 offset;
if (!tree)
return;
ti = proto_tree_add_item(tree, hf_sof_header,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_marker_segment);
proto_item_append_text(ti, ": %s (0x%04X)", marker_name, marker);
proto_tree_add_item(subtree, hf_marker, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_len, tvb, 2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sof_precision, tvb, 4, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sof_lines, tvb, 5, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sof_samples_per_line, tvb, 7, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sof_nf, tvb, 9, 1, ENC_BIG_ENDIAN);
count = tvb_get_guint8(tvb, 9);
offset = 10;
while (count > 0) {
proto_tree_add_item(subtree, hf_sof_c_i, tvb, offset++, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sof_h_i, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sof_v_i, tvb, offset++, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sof_tq_i, tvb, offset++, 1, ENC_BIG_ENDIAN);
count--;
}
}
/*
* Process a Start of Segment header (with length).
*/
static void
process_sos_header(proto_tree *tree, tvbuff_t *tvb, guint32 len _U_,
guint16 marker, const char *marker_name)
{
proto_item *ti;
proto_tree *subtree;
guint8 count;
guint32 offset;
if (!tree)
return;
ti = proto_tree_add_item(tree, hf_sos_header,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_marker_segment);
proto_item_append_text(ti, ": %s (0x%04X)", marker_name, marker);
proto_tree_add_item(subtree, hf_marker, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_len, tvb, 2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sos_ns, tvb, 4, 1, ENC_BIG_ENDIAN);
count = tvb_get_guint8(tvb, 4);
offset = 5;
while (count > 0) {
proto_tree_add_item(subtree, hf_sos_cs_j, tvb, offset++, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sos_td_j, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sos_ta_j, tvb, offset++, 1, ENC_BIG_ENDIAN);
count--;
}
proto_tree_add_item(subtree, hf_sos_ss, tvb, offset++, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sos_se, tvb, offset++, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sos_ah, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_sos_al, tvb, offset, 1, ENC_BIG_ENDIAN);
/* offset ++ */;
}
/*
* Process a Comment header (with length).
*/
static void
process_comment_header(proto_tree *tree, tvbuff_t *tvb, guint32 len,
guint16 marker, const char *marker_name)
{
proto_item *ti;
proto_tree *subtree;
if (!tree)
return;
ti = proto_tree_add_item(tree, hf_comment_header,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_marker_segment);
proto_item_append_text(ti, ": %s (0x%04X)", marker_name, marker);
proto_tree_add_item(subtree, hf_marker, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_len, tvb, 2, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_comment, tvb, 4, len-2, ENC_ASCII|ENC_NA);
}
/* Process an APP0 block.
*
* XXX - This code only works on US-ASCII systems!!!
*/
static int
process_app0_segment(proto_tree *tree, tvbuff_t *tvb, guint32 len,
guint16 marker, const char *marker_name)
{
proto_item *ti;
proto_tree *subtree;
proto_tree *subtree_details = NULL;
guint32 offset;
char *str;
gint str_size;
guint16 x, y;
if (!tree)
return 0;
ti = proto_tree_add_item(tree, hf_marker_segment,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_marker_segment);
proto_item_append_text(ti, ": %s (0x%04X)", marker_name, marker);
proto_tree_add_item(subtree, hf_marker, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_len, tvb, 2, 2, ENC_BIG_ENDIAN);
str = tvb_get_stringz_enc(wmem_packet_scope(), tvb, 4, &str_size, ENC_ASCII);
ti = proto_tree_add_item(subtree, hf_identifier, tvb, 4, str_size, ENC_ASCII|ENC_NA);
if (strcmp(str, "JFIF") == 0) {
/* Version */
ti = proto_tree_add_none_format(subtree, hf_version,
tvb, 9, 2, "Version: %u.%u",
tvb_get_guint8(tvb, 9),
tvb_get_guint8(tvb, 10));
subtree_details = proto_item_add_subtree(ti, ett_details);
proto_tree_add_item(subtree_details, hf_version_major,
tvb, 9, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree_details, hf_version_minor,
tvb, 10, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_units,
tvb, 11, 1, ENC_BIG_ENDIAN);
/* Aspect ratio */
proto_tree_add_item(subtree, hf_xdensity,
tvb, 12, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_ydensity,
tvb, 14, 2, ENC_BIG_ENDIAN);
/* Thumbnail */
proto_tree_add_item(subtree, hf_xthumbnail,
tvb, 16, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_ythumbnail,
tvb, 17, 1, ENC_BIG_ENDIAN);
x = tvb_get_guint8(tvb, 16);
y = tvb_get_guint8(tvb, 17);
if (x || y) {
proto_tree_add_item(subtree, hf_rgb,
tvb, 18, 3 * (x * y), ENC_NA);
offset = 18 + (3 * (x * y));
} else {
offset = 18;
}
}
else if (strcmp(str, "JFXX") == 0) {
proto_tree_add_item(subtree, hf_extension_code,
tvb, 9, 1, ENC_BIG_ENDIAN);
/* XXX - dissect the extension based on its extension code */
offset = 10;
}
else { /* Unknown */
proto_item_append_text(ti, " (unknown identifier)");
offset = 4 + str_size;
proto_tree_add_bytes_format_value(subtree, hf_remain_seg_data, tvb, offset, -1, NULL, "%u bytes", len - 2 - str_size);
}
return offset;
}
/* Process an APP1 block.
*
* XXX - This code only works on US-ASCII systems!!!
*/
static int
process_app1_segment(proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 len,
guint16 marker, const char *marker_name, gboolean show_first_identifier_not_jfif)
{
proto_item *ti;
proto_tree *subtree;
char *str;
gint str_size;
int offset = 0;
int tiff_start;
ti = proto_tree_add_item(tree, hf_marker_segment,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_marker_segment);
proto_item_append_text(ti, ": %s (0x%04X)", marker_name, marker);
proto_tree_add_item(subtree, hf_marker, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(subtree, hf_len, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
str = tvb_get_stringz_enc(wmem_packet_scope(), tvb, offset, &str_size, ENC_ASCII);
ti = proto_tree_add_item(subtree, hf_identifier, tvb, offset, str_size, ENC_ASCII|ENC_NA);
offset += str_size;
if (show_first_identifier_not_jfif && strcmp(str, "JFIF") != 0) {
expert_add_info(pinfo, ti, &ei_file_jpeg_first_identifier_not_jfif);
}
if (strcmp(str, "Exif") == 0) {
/*
* Endianness
*/
int encoding;
guint16 val_16;
guint32 val_32, num_fields;
proto_item* tiff_item;
offset++; /* Skip a byte supposed to be 0x00 */
tiff_start = offset;
val_16 = tvb_get_ntohs(tvb, offset);
if (val_16 == 0x4949) {
encoding = ENC_LITTLE_ENDIAN;
proto_tree_add_uint_format_value(subtree, hf_endianness, tvb, offset, 2, val_16, "little endian");
} else if (val_16 == 0x4D4D) {
encoding = ENC_BIG_ENDIAN;
proto_tree_add_uint_format_value(subtree, hf_endianness, tvb, offset, 2, val_16, "big endian");
} else {
/* Error: invalid endianness encoding */
proto_tree_add_uint_format_value(subtree, hf_endianness, tvb, offset, 2, val_16,
"Incorrect encoding 0x%04x- skipping the remainder of this application marker", val_16);
return offset;
}
offset += 2;
/*
* Fixed value 42 = 0x002a
*/
offset += 2;
/*
* Offset to IFD
*/
val_32 = tvb_get_guint32(tvb, offset, encoding);
tiff_item = proto_tree_add_uint_format_value(subtree, hf_start_ifd_offset, tvb, offset, 4, val_32, "%u bytes",
val_32);
offset += 4;
/*
* Check for a bogus val_32 value.
* XXX - bogus value message should also deal with a
* value that's too large and causes an overflow.
* Or should it just check against the segment length,
* which is 16 bits?
*/
if (val_32 + tiff_start < (guint32)offset) {
expert_add_info_format(pinfo, tiff_item, &ei_start_ifd_offset, " (bogus, should be >= %u)",
offset- tiff_start);
return offset;
}
/*
* Skip the following portion
*/
if (val_32 + tiff_start > (guint32)offset) {
proto_tree_add_bytes_format_value(subtree, hf_skipped_tiff_data, tvb, offset, val_32 + tiff_start - offset, NULL, "%u bytes",
val_32 + tiff_start - offset);
}
for (;;) {
offset = val_32 + tiff_start;
/*
* Process the IFD
*/
proto_tree_add_item_ret_uint(subtree, hf_ifd_num_fields, tvb, offset, 2, encoding, &num_fields);
offset += 2;
while (num_fields-- > 0) {
proto_tree_add_item(subtree, hf_idf_tag, tvb, offset, 2, encoding);
offset += 2;
proto_tree_add_item(subtree, hf_idf_type, tvb, offset, 2, encoding);
offset += 2;
proto_tree_add_item(subtree, hf_idf_count, tvb, offset, 4, encoding);
offset += 4;
proto_tree_add_item(subtree, hf_idf_offset, tvb, offset, 4, encoding);
offset += 4;
}
/*
* Offset to the next IFD
*/
val_32 = tvb_get_guint32(tvb, offset, encoding);
tiff_item = proto_tree_add_uint_format_value(subtree, hf_next_ifd_offset, tvb, offset, 4, val_32, "%u bytes",
val_32);
offset += 4;
if (val_32 != 0 &&
val_32 + tiff_start < (guint32)offset) {
expert_add_info_format(pinfo, tiff_item, &ei_next_ifd_offset, " (bogus, should be >= %u)", offset + tiff_start);
return offset;
}
if (val_32 == 0)
break;
}
} else {
proto_tree_add_bytes_format_value(subtree, hf_remain_seg_data, tvb, offset, -1, NULL, "%u bytes", len - 2 - str_size);
proto_item_append_text(ti, " (Unknown identifier)");
}
return offset;
}
/* Process an APP2 block.
*
* XXX - This code only works on US-ASCII systems!!!
*/
static void
process_app2_segment(proto_tree *tree, tvbuff_t *tvb, guint32 len,
guint16 marker, const char *marker_name)
{
proto_item *ti;
proto_tree *subtree;
char *str;
gint str_size;
if (!tree)
return;
ti = proto_tree_add_item(tree, hf_marker_segment,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_marker_segment);
proto_item_append_text(ti, ": %s (0x%04X)", marker_name, marker);
proto_tree_add_item(subtree, hf_marker, tvb, 0, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(subtree, hf_len, tvb, 2, 2, ENC_BIG_ENDIAN);
str = tvb_get_stringz_enc(wmem_packet_scope(), tvb, 4, &str_size, ENC_ASCII);
ti = proto_tree_add_item(subtree, hf_identifier, tvb, 4, str_size, ENC_ASCII|ENC_NA);
if (strcmp(str, "FPXR") == 0) {
proto_tree_add_item(tree, hf_exif_flashpix_marker, tvb, 0, -1, ENC_NA);
} else {
proto_tree_add_bytes_format_value(subtree, hf_remain_seg_data, tvb, 4 + str_size, -1, NULL, "%u bytes", len - 2 - str_size);
proto_item_append_text(ti, " (Unknown identifier)");
}
}
static gint
dissect_jfif(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
proto_tree *subtree;
proto_item *ti;
gint tvb_len = tvb_reported_length(tvb);
gint32 start_entropy = 0;
gint32 start_fill, start_marker;
gboolean show_first_identifier_not_jfif = FALSE;
/* check if we have a full JFIF in tvb */
if (tvb_len < 20)
return 0;
/* Start Of Image marker must come first */
if (tvb_get_ntohs(tvb, 0) != MARKER_SOI)
return 0;
/* Check identifier field in first App segment is "JFIF", although "Exif" from App1
can/does appear here too... */
if (tvb_memeql(tvb, 6, "Exif", 5) == 0) {
show_first_identifier_not_jfif = TRUE;
}
else if (tvb_memeql(tvb, 6, "JFIF", 5)) {
return 0;
}
/* Add summary to INFO column if it is enabled */
col_append_sep_fstr(pinfo->cinfo, COL_INFO, " ", "(JPEG JFIF image)");
ti = proto_tree_add_item(tree, proto_jfif,
tvb, 0, -1, ENC_NA);
subtree = proto_item_add_subtree(ti, ett_jfif);
for (; ; ) {
const char *str;
guint16 marker;
start_fill = start_entropy;
for (; ; ) {
start_fill = tvb_find_guint8(tvb, start_fill, -1, 0xFF);
if (start_fill == -1 || tvb_len - start_fill == 1
|| tvb_get_guint8(tvb, start_fill + 1) != 0) /* FF 00 is FF escaped */
break;
start_fill += 2;
}
if (start_fill == -1) start_fill = tvb_len;
if (start_fill != start_entropy)
proto_tree_add_item(subtree, hf_entropy_coded_segment, tvb, start_entropy, start_fill - start_entropy, ENC_NA);
if (start_fill == tvb_len) break;
start_marker = start_fill;
while (tvb_get_guint8(tvb, start_marker + 1) == 0xFF)
++start_marker;
if (start_marker != start_fill)
proto_tree_add_item(subtree, hf_fill_bytes, tvb, start_fill, start_marker - start_fill, ENC_NA);
marker = tvb_get_ntohs(tvb, start_marker);
str = try_val_to_str(marker, vals_marker);
if (str) { /* Known marker */
if (marker_has_length(marker)) { /* Marker segment */
/* Length of marker segment = 2 + len */
const guint16 len = tvb_get_ntohs(tvb, start_marker + 2);
tvbuff_t *tmp_tvb = tvb_new_subset_length(tvb, start_marker, 2 + len);
switch (marker) {
case MARKER_APP0:
process_app0_segment(subtree, tmp_tvb, len, marker, str);
break;
case MARKER_APP1:
process_app1_segment(subtree, tmp_tvb, pinfo, len, marker, str, show_first_identifier_not_jfif);
show_first_identifier_not_jfif = FALSE;
break;
case MARKER_APP2:
process_app2_segment(subtree, tmp_tvb, len, marker, str);
break;
case MARKER_SOF0:
case MARKER_SOF1:
case MARKER_SOF2:
case MARKER_SOF3:
case MARKER_SOF5:
case MARKER_SOF6:
case MARKER_SOF7:
case MARKER_SOF8:
case MARKER_SOF9:
case MARKER_SOF10:
case MARKER_SOF11:
case MARKER_SOF13:
case MARKER_SOF14:
case MARKER_SOF15:
process_sof_header(subtree, tmp_tvb, len, marker, str);
break;
case MARKER_SOS:
process_sos_header(subtree, tmp_tvb, len, marker, str);
break;
case MARKER_COM:
process_comment_header(subtree, tmp_tvb, len, marker, str);
break;
default:
process_marker_segment(subtree, tmp_tvb, len, marker, str);
break;
}
start_entropy = start_marker + 2 + len;
} else { /* Marker but no segment */
/* Length = 2 */
proto_tree_add_item(subtree, hf_marker,
tvb, start_marker, 2, ENC_BIG_ENDIAN);
start_entropy = start_marker + 2;
}
} else { /* Reserved! */
ti = proto_tree_add_item(subtree, hf_marker,
tvb, start_marker, 2, ENC_BIG_ENDIAN);
proto_item_append_text(ti, " (Reserved)");
return tvb_len;
}
}
return tvb_len;
}
static gboolean
dissect_jfif_heur(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return dissect_jfif(tvb, pinfo, tree, NULL) > 0;
}
/****************** Register the protocol with Wireshark ******************/
void
proto_register_jfif(void)
{
/*
* Setup list of header fields.
*/
static hf_register_info hf[] = {
/* Marker */
{ &hf_marker,
{ "Marker",
IMG_JFIF ".marker",
FT_UINT8, BASE_HEX, VALS(vals_marker), 0x00,
"JFIF Marker",
HFILL
}
},
/* Marker segment */
{ &hf_marker_segment,
{ "Marker segment",
IMG_JFIF ".marker_segment",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_len,
{ "Length",
IMG_JFIF ".length",
FT_UINT16, BASE_DEC, 0, 0x00,
"Length of segment (including length field)",
HFILL
}
},
/* MARKER_APP0 */
{ &hf_identifier,
{ "Identifier",
IMG_JFIF ".identifier",
FT_STRINGZ, BASE_NONE, NULL, 0x00,
"Identifier of the segment",
HFILL
}
},
/* MARKER_APP0 - JFIF */
{ &hf_version,
{ "Version",
IMG_JFIF ".version",
FT_NONE, BASE_NONE, NULL, 0x00,
"JFIF Version",
HFILL
}
},
{ &hf_version_major,
{ "Major Version",
IMG_JFIF ".version.major",
FT_UINT8, BASE_DEC, NULL, 0x00,
"JFIF Major Version",
HFILL
}
},
{ &hf_version_minor,
{ "Minor Version",
IMG_JFIF ".version.minor",
FT_UINT8, BASE_DEC, NULL, 0x00,
"JFIF Minor Version",
HFILL
}
},
{ &hf_units,
{ "Units",
IMG_JFIF ".units",
FT_UINT8, BASE_DEC, VALS(vals_units), 0x00,
"Units used in this segment",
HFILL
}
},
{ &hf_xdensity,
{ "Xdensity",
IMG_JFIF ".Xdensity",
FT_UINT16, BASE_DEC, NULL, 0x00,
"Horizontal pixel density",
HFILL
}
},
{ &hf_ydensity,
{ "Ydensity",
IMG_JFIF ".Ydensity",
FT_UINT16, BASE_DEC, NULL, 0x00,
"Vertical pixel density",
HFILL
}
},
{ &hf_xthumbnail,
{ "Xthumbnail",
IMG_JFIF ".Xthumbnail",
FT_UINT16, BASE_DEC, NULL, 0x00,
"Thumbnail horizontal pixel count",
HFILL
}
},
{ &hf_ythumbnail,
{ "Ythumbnail",
IMG_JFIF ".Ythumbnail",
FT_UINT16, BASE_DEC, NULL, 0x00,
"Thumbnail vertical pixel count",
HFILL
}
},
{ &hf_rgb,
{ "RGB values of thumbnail pixels",
IMG_JFIF ".RGB",
FT_BYTES, BASE_NONE, NULL, 0x00,
"RGB values of the thumbnail pixels (24 bit per pixel, Xthumbnail x Ythumbnail pixels)",
HFILL
}
},
/* MARKER_APP0 - JFXX */
{ &hf_extension_code,
{ "Extension code",
IMG_JFIF ".extension.code",
FT_UINT8, BASE_HEX, VALS(vals_extension_code), 0x00,
"JFXX extension code for thumbnail encoding",
HFILL
}
},
/* Header: Start of Frame (MARKER_SOF) */
{ &hf_sof_header,
{ "Start of Frame header",
IMG_JFIF ".sof",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_sof_precision,
{ "Sample Precision (bits)",
IMG_JFIF ".sof.precision",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Specifies the precision in bits for the samples of the components in the frame.",
HFILL
}
},
{ &hf_sof_lines,
{ "Lines",
IMG_JFIF ".sof.lines",
FT_UINT16, BASE_DEC, NULL, 0x00,
"Specifies the maximum number of lines in the source image.",
HFILL
}
},
{ &hf_sof_samples_per_line,
{ "Samples per line",
IMG_JFIF ".sof.samples_per_line",
FT_UINT16, BASE_DEC, NULL, 0x00,
"Specifies the maximum number of samples per line in the source image.",
HFILL
}
},
{ &hf_sof_nf,
{ "Number of image components in frame",
IMG_JFIF ".sof.nf",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Specifies the number of source image components in the frame.",
HFILL
}
},
{ &hf_sof_c_i,
{ "Component identifier",
IMG_JFIF ".sof.c_i",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Assigns a unique label to the ith component in the sequence of frame component specification parameters.",
HFILL
}
},
{ &hf_sof_h_i,
{ "Horizontal sampling factor",
IMG_JFIF ".sof.h_i",
FT_UINT8, BASE_DEC, NULL, 0xF0,
"Specifies the relationship between the component horizontal dimension and maximum image dimension X.",
HFILL
}
},
{ &hf_sof_v_i,
{ "Vertical sampling factor",
IMG_JFIF ".sof.v_i",
FT_UINT8, BASE_DEC, NULL, 0x0F,
"Specifies the relationship between the component vertical dimension and maximum image dimension Y.",
HFILL
}
},
{ &hf_sof_tq_i,
{ "Quantization table destination selector",
IMG_JFIF ".sof.tq_i",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Specifies one of four possible quantization table destinations from which the quantization table to"
" use for dequantization of DCT coefficients of component Ci is retrieved.",
HFILL
}
},
/* Header: Start of Segment (MARKER_SOS) */
{ &hf_sos_header,
{ "Start of Segment header",
IMG_JFIF ".header.sos",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_sos_ns,
{ "Number of image components in scan",
IMG_JFIF ".sos.ns",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Specifies the number of source image components in the scan.",
HFILL
}
},
{ &hf_sos_cs_j,
{ "Scan component selector",
IMG_JFIF ".sos.component_selector",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Selects which of the Nf image components specified in the frame parameters shall be the jth"
" component in the scan.",
HFILL
}
},
{ &hf_sos_td_j,
{ "DC entropy coding table destination selector",
IMG_JFIF ".sos.dc_entropy_selector",
FT_UINT8, BASE_DEC, NULL, 0xF0,
"Specifies one of four possible DC entropy coding table destinations from which the entropy"
" table needed for decoding of the DC coefficients of component Csj is retrieved.",
HFILL
}
},
{ &hf_sos_ta_j,
{ "AC entropy coding table destination selector",
IMG_JFIF ".sos.ac_entropy_selector",
FT_UINT8, BASE_DEC, NULL, 0x0F,
"Specifies one of four possible AC entropy coding table destinations from which the entropy"
" table needed for decoding of the AC coefficients of component Csj is retrieved.",
HFILL
}
},
{ &hf_sos_ss,
{ "Start of spectral or predictor selection",
IMG_JFIF ".sos.ss",
FT_UINT8, BASE_DEC, NULL, 0x00,
"In the DCT modes of operation, this parameter specifies the first DCT coefficient in"
" each block in zig-zag order which shall be coded in the scan. This parameter shall"
" be set to zero for the sequential DCT processes. In the lossless mode of operations"
" this parameter is used to select the predictor.",
HFILL
}
},
{ &hf_sos_se,
{ "End of spectral selection",
IMG_JFIF ".sos.se",
FT_UINT8, BASE_DEC, NULL, 0x00,
"Specifies the last DCT coefficient in each block in zig-zag order which shall be coded"
" in the scan. This parameter shall be set to 63 for the sequential DCT processes. In the"
" lossless mode of operations this parameter has no meaning. It shall be set to zero.",
HFILL
}
},
{ &hf_sos_ah,
{ "Successive approximation bit position high",
IMG_JFIF ".sos.ah",
FT_UINT8, BASE_DEC, NULL, 0xF0,
"This parameter specifies the point transform used in the preceding scan (i.e. successive"
" approximation bit position low in the preceding scan) for the band of coefficients"
" specified by Ss and Se. This parameter shall be set to zero for the first scan of each"
" band of coefficients. In the lossless mode of operations this parameter has no meaning."
" It shall be set to zero.",
HFILL
}
},
{ &hf_sos_al,
{ "Successive approximation bit position low or point transform",
IMG_JFIF ".sos.al",
FT_UINT8, BASE_DEC, NULL, 0x0F,
"In the DCT modes of operation this parameter specifies the point transform, i.e. bit"
" position low, used before coding the band of coefficients specified by Ss and Se."
" This parameter shall be set to zero for the sequential DCT processes. In the lossless"
" mode of operations, this parameter specifies the point transform, Pt.",
HFILL
}
},
/* Header: Comment (MARKER_COM) */
{ &hf_comment_header,
{ "Comment header",
IMG_JFIF ".header.comment",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_comment,
{ "Comment",
IMG_JFIF ".comment",
FT_STRING, STR_ASCII, NULL, 0x0,
NULL,
HFILL
}
},
{ &hf_remain_seg_data,
{ "Remaining segment data",
IMG_JFIF ".remain_seg_data",
FT_BYTES, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_endianness,
{ "Endianness",
IMG_JFIF ".endianness",
FT_UINT16, BASE_HEX, NULL, 0x0,
NULL,
HFILL
}
},
{ &hf_start_ifd_offset,
{ "Start offset of IFD starting from the TIFF header start",
IMG_JFIF ".start_ifd_offset",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{ &hf_next_ifd_offset,
{ "Offset to next IFD from start of TIFF header",
IMG_JFIF ".next_ifd_offset",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{ &hf_exif_flashpix_marker,
{ "Exif FlashPix APP2 application marker",
IMG_JFIF ".exif_flashpix_marker",
FT_NONE, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_entropy_coded_segment,
{ "Entropy-coded segment (dissection is not yet implemented)",
IMG_JFIF ".entropy_coded_segment",
FT_BYTES, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_fill_bytes,
{ "Fill bytes",
IMG_JFIF ".fill_bytes",
FT_BYTES, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_skipped_tiff_data,
{ "Skipped data between end of TIFF header and start of IFD",
IMG_JFIF ".skipped_tiff_data",
FT_BYTES, BASE_NONE, NULL, 0x00,
NULL,
HFILL
}
},
{ &hf_ifd_num_fields,
{ "Number of fields in this IFD",
IMG_JFIF ".ifd.num_fields",
FT_UINT16, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{ &hf_idf_tag,
{ "Exif Tag",
IMG_JFIF ".ifd.tag",
FT_UINT16, BASE_DEC, VALS(vals_exif_tags), 0x0,
NULL,
HFILL
}
},
{ &hf_idf_type,
{ "Type",
IMG_JFIF ".ifd.type",
FT_UINT16, BASE_DEC, VALS(vals_exif_types), 0x0,
NULL,
HFILL
}
},
{ &hf_idf_count,
{ "Count",
IMG_JFIF ".ifd.count",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
{ &hf_idf_offset,
{ "Value offset from start of TIFF header",
IMG_JFIF ".ifd.offset",
FT_UINT32, BASE_DEC, NULL, 0x0,
NULL,
HFILL
}
},
};
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_jfif,
&ett_marker_segment,
&ett_details,
};
static ei_register_info ei[] = {
{ &ei_file_jpeg_first_identifier_not_jfif,
{ IMG_JFIF ".app0-identifier-not-jfif", PI_MALFORMED, PI_WARN,
"Initial App0 segment with \"JFIF\" Identifier not found", EXPFILL }},
{ &ei_start_ifd_offset,
{ IMG_JFIF ".start_ifd_offset.invalid", PI_PROTOCOL, PI_WARN,
"Invalid value", EXPFILL }},
{ &ei_next_ifd_offset,
{ IMG_JFIF ".next_ifd_offset.invalid", PI_PROTOCOL, PI_WARN,
"Invalid value", EXPFILL }},
};
expert_module_t* expert_jfif;
/* Register the protocol name and description */
proto_jfif = proto_register_protocol(
"JPEG File Interchange Format",
"JFIF (JPEG) image",
IMG_JFIF
);
/* Required function calls to register the header fields
* and subtrees used */
proto_register_field_array(proto_jfif, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
expert_jfif = expert_register_protocol(proto_jfif);
expert_register_field_array(expert_jfif, ei, array_length(ei));
register_dissector(IMG_JFIF, dissect_jfif, proto_jfif);
}
void
proto_reg_handoff_jfif(void)
{
dissector_handle_t jfif_handle = find_dissector(IMG_JFIF);
/* Register the JPEG media type */
dissector_add_string("media_type", "image/jfif", jfif_handle);
dissector_add_string("media_type", "image/jpg", jfif_handle);
dissector_add_string("media_type", "image/jpeg", jfif_handle);
dissector_add_uint("wtap_encap", WTAP_ENCAP_JPEG_JFIF, jfif_handle);
heur_dissector_add("http", dissect_jfif_heur, "JPEG file in HTTP", "jfif_http", proto_jfif, HEURISTIC_ENABLE);
heur_dissector_add("wtap_file", dissect_jfif_heur, "JPEG file", "jfif_wtap", proto_jfif, HEURISTIC_ENABLE);
}
/*
* Editor modelines - http://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:
*/