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Diffstat (limited to 'epan/dissectors/file-jpeg.c')
| -rw-r--r-- | epan/dissectors/file-jpeg.c | 1796 |
1 files changed, 1796 insertions, 0 deletions
diff --git a/epan/dissectors/file-jpeg.c b/epan/dissectors/file-jpeg.c new file mode 100644 index 00000000..12a7e578 --- /dev/null +++ b/epan/dissectors/file-jpeg.c @@ -0,0 +1,1796 @@ +/* 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: + * https://www.w3.org/Graphics/JPEG/jfif3.pdf + * https://www.w3.org/Graphics/JPEG/itu-t81.pdf + * + * The Exif specifications are found at several locations, such as: + * http://www.exif.org/ + * + * SPDX-License-Identifier: GPL-2.0-or-later + */ + +#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 + +/************************** 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 } +}; + +enum { + EXIF_TAG_EXIF_IFD_POINTER = 0x8769, + EXIF_TAG_GPS_IFD_POINTER = 0x8825, + EXIF_TAG_INTEROP_IFD_POINTER = 0xA005, +}; + +static const value_string vals_ifd_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" }, + { 0x8298, "Copyright" }, + /* + * Exif-specific IFD: + */ + { EXIF_TAG_EXIF_IFD_POINTER, "Exif IFD Pointer"}, + { EXIF_TAG_GPS_IFD_POINTER, "GPS IFD Pointer"}, + { EXIF_TAG_INTEROP_IFD_POINTER, "Interoperability IFD Pointer"}, + + { 0x0000, NULL } +}; + +static const value_string vals_ifd_tags_exif[] = { + /* + * Tags relating to version: + */ + { 0x9000, "ExifVersion" }, + { 0xA000, "FlashpixVersion" }, + /* + * Tags relating to image data characteristics: + */ + { 0xA001, "ColorSpace" }, + { 0xA500, "Gamma" }, + /* + * Tags relating to image configuration: + */ + { 0x9101, "ComponentsConfiguration" }, + { 0x9102, "CompressedBitsPerPixel" }, + { 0xA002, "PixelXDimension" }, + { 0xA003, "PixelYDimension" }, + /* + * Tags relating to user information: + */ + { 0x927C, "MakerNote" }, + { 0x9286, "UserComment" }, + /* + * Tags relating to related file information: + */ + { 0xA004, "RelatedSoundFile" }, + /* + * Tags relating to date and time: + */ + { 0x9003, "DateTimeOriginal" }, + { 0x9004, "DateTimeDigitized" }, + { 0x9010, "OffsetTime" }, + { 0x9011, "OffsetTimeOriginal" }, + { 0x9012, "OffsetTimeDigitized" }, + { 0x9290, "SubSecTime" }, + { 0x9291, "SubSecTimeOriginal" }, + { 0x9292, "SubSecTimeDigitized" }, + /* + * Tags relating to picture-taking conditions: + */ + { 0x829A, "ExposureTime" }, + { 0x829D, "FNumber" }, + { 0x8822, "ExposureProgram" }, + { 0x8824, "SpectralSensitivity" }, + { 0x8827, "PhotographicSensitivity" }, + { 0x8828, "OECF" }, + { 0x8830, "SensitivityType" }, + { 0x8831, "StandardOutputSensitivity" }, + { 0x8832, "RecommendedExposureIndex" }, + { 0x8833, "ISOSpeed" }, + { 0x8834, "ISOSpeedLatitudeyyy" }, + { 0x8835, "ISOSpeedLatitudezzz" }, + { 0x9201, "ShutterSpeedValue" }, + { 0x9202, "ApertureValue" }, + { 0x9203, "BrightnessValue" }, + { 0x9204, "ExposureBiasValue" }, + { 0x9205, "MaxApertureValue" }, + { 0x9206, "SubjectDistance" }, + { 0x9207, "MeteringMode" }, + { 0x9208, "LightSource" }, + { 0x9209, "Flash" }, + { 0x920A, "FocalLength" }, + { 0x9214, "SubjectArea" }, + { 0xA20B, "FlashEnergy" }, + { 0xA20C, "SpatialFrequencyResponse" }, + { 0xA20E, "FocalPlaneXResolution" }, + { 0xA20F, "FocalPlaneYResolution" }, + { 0xA210, "FocalPlaneResolutionUnit" }, + { 0xA214, "SubjectLocation" }, + { 0xA215, "ExposureIndex" }, + { 0xA217, "SensingMethod" }, + { 0xA300, "FileSource" }, + { 0xA301, "SceneType" }, + { 0xA302, "CFAPattern" }, + { 0xA401, "CustomRendered" }, + { 0xA402, "ExposureMode" }, + { 0xA403, "WhiteBalance" }, + { 0xA404, "DigitalZoomRatio" }, + { 0xA405, "FocalLengthIn35mmFilm" }, + { 0xA406, "SceneCaptureType" }, + { 0xA407, "GainControl" }, + { 0xA408, "Contrast" }, + { 0xA409, "Saturation" }, + { 0xA40A, "Sharpness" }, + { 0xA40B, "DeviceSettingDescription" }, + { 0xA40C, "SubjectDistanceRange" }, + { 0xA460, "CompositeImage" }, + { 0xA461, "SourceImageNumberOfCompositeImage" }, + { 0xA462, "SourceExposureTimesOfCompositeImage" }, + /* + * Tags relating to shooting situation: + */ + { 0x9400, "Temperature" }, + { 0x9401, "Humidity" }, + { 0x9402, "Pressure" }, + { 0x9403, "WaterDepth" }, + { 0x9404, "Acceleration" }, + { 0x9405, "CameraElevationAngle" }, + /* + * Other tags: + */ + { 0xA420, "ImageUniqueID" }, + { 0xA430, "CameraOwnerName" }, + { 0xA431, "BodySerialNumber" }, + { 0xA432, "LensSpecification" }, + { 0xA433, "LensMake" }, + { 0xA434, "LensModel" }, + { 0xA435, "LensSerialNumber" }, + + { 0x0000, NULL } +}; + +static const value_string vals_ifd_tags_gps[] = { + /* + * Tags relating to GPS: + */ + { 0x00, "GPSVersionID" }, + { 0x01, "GPSLatitudeRef" }, + { 0x02, "GPSLatitude" }, + { 0x03, "GPSLongitudeRef" }, + { 0x04, "GPSLongitude" }, + { 0x05, "GPSAltitudeRef" }, + { 0x06, "GPSAltitude" }, + { 0x07, "GPSTimeStamp" }, + { 0x08, "GPSSatellites" }, + { 0x09, "GPSStatus" }, + { 0x0A, "GPSMeasureMode" }, + { 0x0B, "GPSDOP" }, + { 0x0C, "GPSSpeedRef" }, + { 0x0D, "GPSSpeed" }, + { 0x0E, "GPSTrackRef" }, + { 0x0F, "GPSTrack" }, + { 0x10, "GPSImgDirectionRef" }, + { 0x11, "GPSImgDirection" }, + { 0x12, "GPSMapDatum" }, + { 0x13, "GPSDestLatitudeRef" }, + { 0x14, "GPSDestLatitude" }, + { 0x15, "GPSDestLongitudeRef" }, + { 0x16, "GPSDestLongitude" }, + { 0x17, "GPSDestBearingRef" }, + { 0x18, "GPSDestBearing" }, + { 0x19, "GPSDestDistanceRef" }, + { 0x1A, "GPSDestDistance" }, + { 0x1B, "GPSProcessingMethod" }, + { 0x1C, "GPSAreaInformation" }, + { 0x1D, "GPSDateStamp" }, + { 0x1E, "GPSDifferential" }, + { 0x1F, "GPSHPositioningError" }, + { 0x00, NULL } +}; + +static const value_string vals_ifd_tags_interop[] = { + /* + * Tags relating to interoperability: + */ + { 0x1, "InteroperabilityIndex" }, + { 0x0, NULL } +}; + +enum { + EXIF_TYPE_BYTE = 0x0001, + EXIF_TYPE_ASCII = 0x0002, + EXIF_TYPE_SHORT = 0x0003, + EXIF_TYPE_LONG = 0x0004, + EXIF_TYPE_RATIONAL = 0x0005, + /* 0x0006 */ + EXIF_TYPE_UNDEFINED = 0x0007, + /* 0x0008 */ + EXIF_TYPE_SLONG = 0x0009, + EXIF_TYPE_SRATIONAL = 0x000A, +}; + +static const value_string vals_exif_types[] = { + { EXIF_TYPE_BYTE, "BYTE" }, + { EXIF_TYPE_ASCII, "ASCII" }, + { EXIF_TYPE_SHORT, "SHORT" }, + { EXIF_TYPE_LONG, "LONG" }, + { EXIF_TYPE_RATIONAL, "RATIONAL" }, + { EXIF_TYPE_UNDEFINED, "UNDEFINED" }, + { EXIF_TYPE_SLONG, "SLONG" }, + { EXIF_TYPE_SRATIONAL, "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_ifd_tag = -1; +static gint hf_ifd_tag_exif = -1; +static gint hf_ifd_tag_gps = -1; +static gint hf_ifd_tag_interop = -1; +static gint hf_ifd_type = -1; +static gint hf_ifd_count = -1; +static gint hf_ifd_offset = -1; +static gint hf_ifd_value_byte = -1; +static gint hf_ifd_value_ascii = -1; +static gint hf_ifd_value_short = -1; +static gint hf_ifd_value_long = -1; +static gint hf_ifd_value_rational = -1; +static gint hf_ifd_value_rational_numerator = -1; +static gint hf_ifd_value_rational_denominator = -1; +static gint hf_ifd_value_undefined = -1; +static gint hf_ifd_value_slong = -1; +static gint hf_ifd_value_srational = -1; +static gint hf_ifd_value_srational_numerator = -1; +static gint hf_ifd_value_srational_denominator = -1; + + +/* Initialize the subtree pointers */ +static gint ett_jfif = -1; +static gint ett_marker_segment = -1; +static gint ett_details = -1; +static gint ett_ifd = -1; +static gint ett_rational = -1; +static gint ett_srational = -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; +static expert_field ei_ifd_value_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); +} + + +/* Process an APP0 block. + * + * XXX - This code only works on US-ASCII systems!!! + */ +static int +process_app0_segment(proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, 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 = (char *)tvb_get_stringz_enc(pinfo->pool, tvb, 4, &str_size, ENC_ASCII); + ti = proto_tree_add_item(subtree, hf_identifier, tvb, 4, str_size, ENC_ASCII); + 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; +} + +static void +process_tiff_ifd_chain(proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, + guint encoding, guint32 start_ifd_offset, + int hf_tag, const char *ifd_type_desc) +{ + guint32 next_ifd_offset = start_ifd_offset; + + for (unsigned ifd_index = 0;; ++ifd_index) { + int offset = next_ifd_offset; + /* + * Process the IFD + */ + guint32 num_fields = tvb_get_guint16(tvb, offset, encoding); + proto_tree *subtree_ifd = proto_tree_add_subtree_format(tree, tvb, offset, num_fields * 12 + 6, + ett_ifd, NULL, "%s #%u", ifd_type_desc, ifd_index); + proto_tree_add_item(subtree_ifd, hf_ifd_num_fields, tvb, offset, 2, encoding); + offset += 2; + while (num_fields-- > 0) { + guint32 field_tag, field_type, value_count, value_size; + gint value_hf; + + proto_tree_add_item_ret_uint(subtree_ifd, hf_tag, tvb, offset, 2, encoding, &field_tag); + offset += 2; + proto_tree_add_item_ret_uint(subtree_ifd, hf_ifd_type, tvb, offset, 2, encoding, &field_type); + offset += 2; + proto_tree_add_item_ret_uint(subtree_ifd, hf_ifd_count, tvb, offset, 4, encoding, &value_count); + offset += 4; + + switch (field_type) { + case EXIF_TYPE_BYTE: + value_size = 1; value_hf = hf_ifd_value_byte; break; + case EXIF_TYPE_ASCII: + value_size = 1; value_hf = hf_ifd_value_ascii; break; + case EXIF_TYPE_SHORT: + value_size = 2; value_hf = hf_ifd_value_short; break; + case EXIF_TYPE_LONG: + value_size = 4; value_hf = hf_ifd_value_long; break; + case EXIF_TYPE_RATIONAL: + value_size = 8; value_hf = hf_ifd_value_rational; break; + case EXIF_TYPE_UNDEFINED: + value_size = 1; value_hf = hf_ifd_value_undefined; break; + case EXIF_TYPE_SLONG: + value_size = 4; value_hf = hf_ifd_value_slong; break; + case EXIF_TYPE_SRATIONAL: + value_size = 8; value_hf = hf_ifd_value_srational; break; + default: + value_size = 0; value_hf = -1; break; + } + + int value_offset = -1; + proto_tree *value_parent = NULL; + + if (value_size == 0 || 4 / value_size < value_count) { + /* The value(s) are located outside the IFD, and the offset field points to them. */ + guint32 value_offset_uint; + proto_item *offset_item = proto_tree_add_item_ret_uint( + subtree_ifd, hf_ifd_offset, tvb, offset, 4, encoding, &value_offset_uint); + + if (value_offset_uint < tvb_reported_length(tvb)) { + value_offset = (int)value_offset_uint; + } else { + expert_add_info_format(pinfo, offset_item, &ei_ifd_value_offset, + "bogus, should be < %u", tvb_reported_length(tvb)); + } + + value_parent = tree; + } else { + /* The value(s) are small enough to fit directly in the offset field. */ + value_offset = offset; + value_parent = subtree_ifd; + } + + if (value_offset >= 0) { + if (value_hf == hf_ifd_value_ascii || value_hf == hf_ifd_value_undefined) + proto_tree_add_item(value_parent, value_hf, tvb, value_offset, value_count, ENC_NA); + else if (value_size != 0) + for (guint32 i = 0; i < value_count; ++i) { + proto_item *value_item = proto_tree_add_item(value_parent, value_hf, tvb, + value_offset, value_size, encoding); + + if (value_hf == hf_ifd_value_rational) { + proto_tree *subtree_value = proto_item_add_subtree(value_item, ett_rational); + guint32 num, denom; + proto_tree_add_item_ret_uint( + subtree_value, hf_ifd_value_rational_numerator, tvb, + value_offset, 4, encoding, &num); + proto_tree_add_item_ret_uint( + subtree_value, hf_ifd_value_rational_denominator, tvb, + value_offset + 4, 4, encoding, &denom); + proto_item_set_text(value_item, "Value: %"PRIu32"/%"PRIu32, num, denom); + } + else if (value_hf == hf_ifd_value_srational) { + proto_tree *subtree_value = proto_item_add_subtree(value_item, ett_srational); + gint32 num, denom; + proto_tree_add_item_ret_int( + subtree_value, hf_ifd_value_srational_numerator, tvb, + value_offset, 4, encoding, &num); + proto_tree_add_item_ret_int( + subtree_value, hf_ifd_value_srational_denominator, tvb, + value_offset + 4, 4, encoding, &denom); + proto_item_set_text(value_item, "Value: %"PRIi32"/%"PRIi32, num, denom); + } + else if (value_hf == hf_ifd_value_long && value_count == 1 && hf_tag == hf_ifd_tag) { + guint32 extension_ifd_offset = tvb_get_guint32(tvb, value_offset, encoding); + int extension_hf_ifd_tag = -1; + const char *extension_ifd_type_desc = NULL; + + switch (field_tag) { + case EXIF_TAG_EXIF_IFD_POINTER: + extension_hf_ifd_tag = hf_ifd_tag_exif; + extension_ifd_type_desc = "Exif IFD"; + break; + case EXIF_TAG_GPS_IFD_POINTER: + extension_hf_ifd_tag = hf_ifd_tag_gps; + extension_ifd_type_desc = "GPS IFD"; + break; + case EXIF_TAG_INTEROP_IFD_POINTER: + extension_hf_ifd_tag = hf_ifd_tag_interop; + extension_ifd_type_desc = "Interoperability IFD"; + break; + } + + if (extension_ifd_type_desc) { + if (extension_ifd_offset < tvb_reported_length(tvb)) { + process_tiff_ifd_chain(tree, tvb, pinfo, encoding, + extension_ifd_offset, extension_hf_ifd_tag, + extension_ifd_type_desc); + } else { + expert_add_info_format(pinfo, value_item, &ei_start_ifd_offset, + "bogus, should be < %u", tvb_reported_length(tvb)); + } + } + } + + value_offset += value_size; + } + } + offset += 4; + } + /* + * Offset to the next IFD + */ + proto_item *next_ifd_offset_item = proto_tree_add_item_ret_uint( + subtree_ifd, hf_next_ifd_offset, tvb, offset, 4, encoding, &next_ifd_offset); + offset += 4; + + if (next_ifd_offset == 0) + break; + + if (next_ifd_offset < (guint32)offset) { + expert_add_info_format(pinfo, next_ifd_offset_item, &ei_next_ifd_offset, + " (bogus, should be >= %u)", offset); + return; + } + } +} + +static void +process_tiff(proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo) +{ + /* + * Endianness + */ + guint encoding; + int offset = 0; + + guint16 byte_order = tvb_get_ntohs(tvb, offset); + if (byte_order == 0x4949) { + encoding = ENC_LITTLE_ENDIAN; + proto_tree_add_uint_format_value(tree, hf_endianness, tvb, offset, 2, byte_order, "little endian"); + } else if (byte_order == 0x4D4D) { + encoding = ENC_BIG_ENDIAN; + proto_tree_add_uint_format_value(tree, hf_endianness, tvb, offset, 2, byte_order, "big endian"); + } else { + /* Error: invalid endianness encoding */ + proto_tree_add_uint_format_value(tree, hf_endianness, tvb, offset, 2, byte_order, + "Incorrect encoding 0x%04x- skipping the remainder of this application marker", byte_order); + return; + } + offset += 2; + /* + * Fixed value 42 = 0x002a + */ + offset += 2; + /* + * Offset to IFD + */ + guint32 start_ifd_offset; + proto_item* start_ifd_offset_item = proto_tree_add_item_ret_uint( + tree, hf_start_ifd_offset, tvb, offset, 4, encoding, &start_ifd_offset); + offset += 4; + /* + * Check for a bogus offset 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 (start_ifd_offset < (guint32)offset) { + expert_add_info_format(pinfo, start_ifd_offset_item, &ei_start_ifd_offset, + " (bogus, should be >= %u)", offset); + return; + } + + process_tiff_ifd_chain(tree, tvb, pinfo, encoding, start_ifd_offset, + hf_ifd_tag, "Image File Directory"); +} + +/* Process an APP1 block. + * + * XXX - This code only works on US-ASCII systems!!! + */ +static void +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; + + 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 = (char*)tvb_get_stringz_enc(pinfo->pool, tvb, offset, &str_size, ENC_ASCII); + ti = proto_tree_add_item(subtree, hf_identifier, tvb, offset, str_size, ENC_ASCII); + 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) { + offset++; /* Skip a byte supposed to be 0x00 */ + + tvbuff_t *tvb_tiff = tvb_new_subset_remaining(tvb, offset); + process_tiff(subtree, tvb_tiff, pinfo); + } 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)"); + } +} + +/* Process an APP2 block. + * + * XXX - This code only works on US-ASCII systems!!! + */ +static void +process_app2_segment(proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, 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 = (char*)tvb_get_stringz_enc(pinfo->pool, tvb, 4, &str_size, ENC_ASCII); + ti = proto_tree_add_item(subtree, hf_identifier, tvb, 4, str_size, ENC_ASCII); + 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, (const guint8*)"Exif", 5) == 0) { + show_first_identifier_not_jfif = TRUE; + } + else if (tvb_memeql(tvb, 6, (const guint8*)"JFIF", 5)) { + return 0; + } + + /* Add summary to INFO column if it is enabled */ + col_append_sep_str(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, pinfo, 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, pinfo, 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", + "image-jfif.marker", + FT_UINT16, BASE_HEX, VALS(vals_marker), 0x0, + "JFIF Marker", + HFILL + } + }, + /* Marker segment */ + { &hf_marker_segment, + { "Marker segment", + "image-jfif.marker_segment", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_len, + { "Length", + "image-jfif.length", + FT_UINT16, BASE_DEC, 0, 0x0, + "Length of segment (including length field)", + HFILL + } + }, + /* MARKER_APP0 */ + { &hf_identifier, + { "Identifier", + "image-jfif.identifier", + FT_STRINGZ, BASE_NONE, NULL, 0x0, + "Identifier of the segment", + HFILL + } + }, + /* MARKER_APP0 - JFIF */ + { &hf_version, + { "Version", + "image-jfif.version", + FT_NONE, BASE_NONE, NULL, 0x0, + "JFIF Version", + HFILL + } + }, + { &hf_version_major, + { "Major Version", + "image-jfif.version.major", + FT_UINT8, BASE_DEC, NULL, 0x0, + "JFIF Major Version", + HFILL + } + }, + { &hf_version_minor, + { "Minor Version", + "image-jfif.version.minor", + FT_UINT8, BASE_DEC, NULL, 0x0, + "JFIF Minor Version", + HFILL + } + }, + { &hf_units, + { "Units", + "image-jfif.units", + FT_UINT8, BASE_DEC, VALS(vals_units), 0x0, + "Units used in this segment", + HFILL + } + }, + { &hf_xdensity, + { "Xdensity", + "image-jfif.Xdensity", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Horizontal pixel density", + HFILL + } + }, + { &hf_ydensity, + { "Ydensity", + "image-jfif.Ydensity", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Vertical pixel density", + HFILL + } + }, + { &hf_xthumbnail, + { "Xthumbnail", + "image-jfif.Xthumbnail", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Thumbnail horizontal pixel count", + HFILL + } + }, + { &hf_ythumbnail, + { "Ythumbnail", + "image-jfif.Ythumbnail", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Thumbnail vertical pixel count", + HFILL + } + }, + { &hf_rgb, + { "RGB values of thumbnail pixels", + "image-jfif.RGB", + FT_BYTES, BASE_NONE, NULL, 0x0, + "RGB values of the thumbnail pixels (24 bit per pixel, Xthumbnail x Ythumbnail pixels)", + HFILL + } + }, + /* MARKER_APP0 - JFXX */ + { &hf_extension_code, + { "Extension code", + "image-jfif.extension.code", + FT_UINT8, BASE_HEX, VALS(vals_extension_code), 0x0, + "JFXX extension code for thumbnail encoding", + HFILL + } + }, + /* Header: Start of Frame (MARKER_SOF) */ + { &hf_sof_header, + { "Start of Frame header", + "image-jfif.sof", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_sof_precision, + { "Sample Precision (bits)", + "image-jfif.sof.precision", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Specifies the precision in bits for the samples of the components in the frame.", + HFILL + } + }, + { &hf_sof_lines, + { "Lines", + "image-jfif.sof.lines", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Specifies the maximum number of lines in the source image.", + HFILL + } + }, + { &hf_sof_samples_per_line, + { "Samples per line", + "image-jfif.sof.samples_per_line", + FT_UINT16, BASE_DEC, NULL, 0x0, + "Specifies the maximum number of samples per line in the source image.", + HFILL + } + }, + { &hf_sof_nf, + { "Number of image components in frame", + "image-jfif.sof.nf", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Specifies the number of source image components in the frame.", + HFILL + } + }, + { &hf_sof_c_i, + { "Component identifier", + "image-jfif.sof.c_i", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Assigns a unique label to the ith component in the sequence of frame component specification parameters.", + HFILL + } + }, + { &hf_sof_h_i, + { "Horizontal sampling factor", + "image-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", + "image-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", + "image-jfif.sof.tq_i", + FT_UINT8, BASE_DEC, NULL, 0x0, + "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", + "image-jfif.header.sos", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_sos_ns, + { "Number of image components in scan", + "image-jfif.sos.ns", + FT_UINT8, BASE_DEC, NULL, 0x0, + "Specifies the number of source image components in the scan.", + HFILL + } + }, + { &hf_sos_cs_j, + { "Scan component selector", + "image-jfif.sos.component_selector", + FT_UINT8, BASE_DEC, NULL, 0x0, + "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", + "image-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", + "image-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", + "image-jfif.sos.ss", + FT_UINT8, BASE_DEC, NULL, 0x0, + "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", + "image-jfif.sos.se", + FT_UINT8, BASE_DEC, NULL, 0x0, + "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", + "image-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", + "image-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", + "image-jfif.header.comment", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_comment, + { "Comment", + "image-jfif.comment", + FT_STRING, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_remain_seg_data, + { "Remaining segment data", + "image-jfif.remain_seg_data", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_endianness, + { "Endianness", + "image-jfif.endianness", + FT_UINT16, BASE_HEX, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_start_ifd_offset, + { "Start offset of IFD starting from the TIFF header start", + "image-jfif.start_ifd_offset", + FT_UINT32, BASE_DEC|BASE_UNIT_STRING, &units_byte_bytes, 0x0, + NULL, + HFILL + } + }, + { &hf_next_ifd_offset, + { "Offset to next IFD from start of TIFF header", + "image-jfif.next_ifd_offset", + FT_UINT32, BASE_DEC|BASE_UNIT_STRING, &units_byte_bytes, 0x0, + NULL, + HFILL + } + }, + { &hf_exif_flashpix_marker, + { "Exif FlashPix APP2 application marker", + "image-jfif.exif_flashpix_marker", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_entropy_coded_segment, + { "Entropy-coded segment (dissection is not yet implemented)", + "image-jfif.entropy_coded_segment", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_fill_bytes, + { "Fill bytes", + "image-jfif.fill_bytes", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_skipped_tiff_data, + { "Skipped data between end of TIFF header and start of IFD", + "image-jfif.skipped_tiff_data", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_num_fields, + { "Number of fields in this IFD", + "image-jfif.ifd.num_fields", + FT_UINT16, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_tag, + { "Tag", + "image-jfif.ifd.tag", + FT_UINT16, BASE_DEC, VALS(vals_ifd_tags), 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_tag_exif, + { "Tag", + "image-jfif.ifd.tag_exif", + FT_UINT16, BASE_DEC, VALS(vals_ifd_tags_exif), 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_tag_gps, + { "Tag", + "image-jfif.ifd.tag_gps", + FT_UINT16, BASE_DEC, VALS(vals_ifd_tags_gps), 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_tag_interop, + { "Tag", + "image-jfif.ifd.tag_interop", + FT_UINT16, BASE_DEC, VALS(vals_ifd_tags_interop), 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_type, + { "Type", + "image-jfif.ifd.type", + FT_UINT16, BASE_DEC, VALS(vals_exif_types), 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_count, + { "Count", + "image-jfif.ifd.count", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_offset, + { "Value offset from start of TIFF header", + "image-jfif.ifd.offset", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_byte, + { "Value", + "image-jfif.ifd.value_byte", + FT_UINT8, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_ascii, + { "Value", + "image-jfif.ifd.value_ascii", + FT_STRING, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_short, + { "Value", + "image-jfif.ifd.value_short", + FT_UINT16, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_long, + { "Value", + "image-jfif.ifd.value_long", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_rational, + { "Value", + "image-jfif.ifd.value_rational", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_rational_numerator, + { "Numerator", + "image-jfif.ifd.value_rational.numerator", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_rational_denominator, + { "Denominator", + "image-jfif.ifd.value_rational.denominator", + FT_UINT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_undefined, + { "Value (raw)", + "image-jfif.ifd.value_undefined", + FT_BYTES, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_slong, + { "Value", + "image-jfif.ifd.value_slong", + FT_INT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_srational, + { "Value", + "image-jfif.ifd.value_srational", + FT_NONE, BASE_NONE, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_srational_numerator, + { "Numerator", + "image-jfif.ifd.value_srational.numerator", + FT_INT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + { &hf_ifd_value_srational_denominator, + { "Denominator", + "image-jfif.ifd.value_srational.denominator", + FT_INT32, BASE_DEC, NULL, 0x0, + NULL, + HFILL + } + }, + }; + + /* Setup protocol subtree array */ + static gint *ett[] = { + &ett_jfif, + &ett_marker_segment, + &ett_details, + &ett_ifd, + &ett_rational, + &ett_srational, + }; + + static ei_register_info ei[] = { + { &ei_file_jpeg_first_identifier_not_jfif, + { "image-jfif.app0-identifier-not-jfif", PI_PROTOCOL, PI_WARN, + "Initial App0 segment with \"JFIF\" Identifier not found", EXPFILL }}, + { &ei_start_ifd_offset, + { "image-jfif.start_ifd_offset.invalid", PI_PROTOCOL, PI_WARN, + "Invalid value", EXPFILL }}, + { &ei_next_ifd_offset, + { "image-jfif.next_ifd_offset.invalid", PI_PROTOCOL, PI_WARN, + "Invalid value", EXPFILL }}, + { &ei_ifd_value_offset, + { "image-jfif.ifd_value_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", + "image-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("image-jfif", dissect_jfif, proto_jfif); +} + + +void +proto_reg_handoff_jfif(void) +{ + dissector_handle_t jfif_handle = find_dissector("image-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 - 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: + */ |