diff options
Diffstat (limited to 'tools/jpeginfo.c')
| -rw-r--r-- | tools/jpeginfo.c | 1246 |
1 files changed, 2 insertions, 1244 deletions
diff --git a/tools/jpeginfo.c b/tools/jpeginfo.c index f8db824..7836926 100644 --- a/tools/jpeginfo.c +++ b/tools/jpeginfo.c @@ -15,995 +15,14 @@ // CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. // +#include "info.h" + #include <jv.h> #include <errno.h> #include <stdlib.h> #include <string.h> #include <stdbool.h> -#include <stdarg.h> - -// --- Utilities --------------------------------------------------------------- - -static char * -binhex(const uint8_t *data, size_t len) -{ - static const char *alphabet = "0123456789abcdef"; - char *buf = calloc(1, len * 2 + 1), *p = buf; - for (size_t i = 0; i < len; i++) { - *p++ = alphabet[data[i] >> 4]; - *p++ = alphabet[data[i] & 0xF]; - } - return buf; -} - -static uint32_t -u32be(const uint8_t *p) -{ - return (uint32_t) p[0] << 24 | p[1] << 16 | p[2] << 8 | p[3]; -} - -static uint16_t -u16be(const uint8_t *p) -{ - return (uint16_t) p[0] << 8 | p[1]; -} - -static uint32_t -u32le(const uint8_t *p) -{ - return (uint32_t) p[3] << 24 | p[2] << 16 | p[1] << 8 | p[0]; -} - -static uint16_t -u16le(const uint8_t *p) -{ - return (uint16_t) p[1] << 8 | p[0]; -} - -// --- TIFF -------------------------------------------------------------------- -// TIFF Revision 6.0 (1992) -// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFF6.pdf -// -// TIFF Technical Note 1: TIFF Trees (1993) -// https://download.osgeo.org/libtiff/old/TTN1.ps -// -// DRAFT TIFF Technical Note 2 (1995) -// https://www.awaresystems.be/imaging/tiff/specification/TIFFTechNote2.txt -// -// Adobe PageMaker 6.0 TIFF Technical Notes (1995) [includes TTN1] -// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFFPM6.pdf -// -// Adobe Photoshop TIFF Technical Notes (2002) -// https://www.adobe.io/content/dam/udp/en/open/standards/tiff/TIFFphotoshop.pdf -// - Note that ImageSourceData 8BIM frames are specified differently -// from how Adobe XMP Specification Part 3 defines them. -// - The document places a condition on SubIFDs, without further explanation. -// -// Adobe Photoshop TIFF Technical Note 3 (2005) -// http://chriscox.org/TIFFTN3d1.pdf -// -// Exif Version 2.3 (2012) -// https://www.cipa.jp/std/documents/e/DC-008-2012_E.pdf -// -// Exif Version 2.32 (2019) -// https://www.cipa.jp/e/std/std-sec.html -// -// libtiff is a mess, and the format is not particularly complicated. -// Exiv2 is senselessly copylefted, and cannot do much. -// libexif is only marginally better. -// ExifTool is too user-oriented. - -static struct un { - uint32_t (*u32) (const uint8_t *); - uint16_t (*u16) (const uint8_t *); -} unbe = {u32be, u16be}, unle = {u32le, u16le}; - -struct tiffer { - struct un *un; - const uint8_t *begin, *p, *end; - uint16_t remaining_fields; -}; - -static bool -tiffer_u32(struct tiffer *self, uint32_t *u) -{ - if (self->p + 4 > self->end) - return false; - *u = self->un->u32(self->p); - self->p += 4; - return true; -} - -static bool -tiffer_u16(struct tiffer *self, uint16_t *u) -{ - if (self->p + 2 > self->end) - return false; - *u = self->un->u16(self->p); - self->p += 2; - return true; -} - -// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -static bool -tiffer_init(struct tiffer *self, const uint8_t *tiff, size_t len) -{ - self->un = NULL; - self->begin = self->p = tiff; - self->end = tiff + len; - self->remaining_fields = 0; - - const uint8_t - le[4] = {'I', 'I', 42, 0}, - be[4] = {'M', 'M', 0, 42}; - - if (tiff + 8 > self->end) - return false; - else if (!memcmp(tiff, le, sizeof le)) - self->un = &unle; - else if (!memcmp(tiff, be, sizeof be)) - self->un = &unbe; - else - return false; - - self->p = tiff + 4; - // The first IFD needs to be read by caller explicitly, - // even though it's required to be present by TIFF 6.0. - return true; -} - -/// Read the next IFD in a sequence. -static bool -tiffer_next_ifd(struct tiffer *self) -{ - // All fields from any previous IFD need to be read first. - if (self->remaining_fields) - return false; - - uint32_t ifd_offset = 0; - if (!tiffer_u32(self, &ifd_offset)) - return false; - - // There is nothing more to read, this chain has terminated. - if (!ifd_offset) - return false; - - // Note that TIFF 6.0 requires there to be at least one entry, - // but there is no need for us to check it. - self->p = self->begin + ifd_offset; - return tiffer_u16(self, &self->remaining_fields); -} - -/// Initialize a derived TIFF reader for a subIFD at the given location. -static bool -tiffer_subifd(struct tiffer *self, uint32_t offset, struct tiffer *subreader) -{ - *subreader = *self; - subreader->p = subreader->begin + offset; - return tiffer_u16(subreader, &subreader->remaining_fields); -} - -enum tiffer_type { - BYTE = 1, ASCII, SHORT, LONG, RATIONAL, - SBYTE, UNDEFINED, SSHORT, SLONG, SRATIONAL, FLOAT, DOUBLE, - IFD // This last type from TIFF Technical Note 1 isn't really used much. -}; - -static size_t -tiffer_value_size(enum tiffer_type type) -{ - switch (type) { - case BYTE: - case SBYTE: - case ASCII: - case UNDEFINED: - return 1; - case SHORT: - case SSHORT: - return 2; - case LONG: - case SLONG: - case FLOAT: - case IFD: - return 4; - case RATIONAL: - case SRATIONAL: - case DOUBLE: - return 8; - default: - return 0; - } -} - -/// A lean iterator for values within entries. -struct tiffer_entry { - uint16_t tag; - enum tiffer_type type; - // For {S,}BYTE, ASCII, UNDEFINED, use these fields directly. - const uint8_t *p; - uint32_t remaining_count; -}; - -static bool -tiffer_next_value(struct tiffer_entry *entry) -{ - if (!entry->remaining_count) - return false; - - entry->p += tiffer_value_size(entry->type); - entry->remaining_count--; - return true; -} - -static bool -tiffer_integer( - const struct tiffer *self, const struct tiffer_entry *entry, int64_t *out) -{ - if (!entry->remaining_count) - return false; - - // Somewhat excessively lenient, intended for display. - // TIFF 6.0 only directly suggests that a reader is should accept - // any of BYTE/SHORT/LONG for unsigned integers. - switch (entry->type) { - case BYTE: - case ASCII: - case UNDEFINED: - *out = *entry->p; - return true; - case SBYTE: - *out = (int8_t) *entry->p; - return true; - case SHORT: - *out = self->un->u16(entry->p); - return true; - case SSHORT: - *out = (int16_t) self->un->u16(entry->p); - return true; - case LONG: - case IFD: - *out = self->un->u32(entry->p); - return true; - case SLONG: - *out = (int32_t) self->un->u32(entry->p); - return true; - default: - return false; - } -} - -static bool -tiffer_rational(const struct tiffer *self, const struct tiffer_entry *entry, - int64_t *numerator, int64_t *denominator) -{ - if (!entry->remaining_count) - return false; - - // Somewhat excessively lenient, intended for display. - switch (entry->type) { - case RATIONAL: - *numerator = self->un->u32(entry->p); - *denominator = self->un->u32(entry->p + 4); - return true; - case SRATIONAL: - *numerator = (int32_t) self->un->u32(entry->p); - *denominator = (int32_t) self->un->u32(entry->p + 4); - return true; - default: - if (tiffer_integer(self, entry, numerator)) { - *denominator = 1; - return true; - } - return false; - } -} - -static bool -tiffer_real( - const struct tiffer *self, const struct tiffer_entry *entry, double *out) -{ - if (!entry->remaining_count) - return false; - - // Somewhat excessively lenient, intended for display. - // Assuming the host architecture uses IEEE 754. - switch (entry->type) { - int64_t numerator, denominator; - case FLOAT: - *out = *(float *) entry->p; - return true; - case DOUBLE: - *out = *(double *) entry->p; - return true; - default: - if (tiffer_rational(self, entry, &numerator, &denominator)) { - *out = (double) numerator / denominator; - return true; - } - return false; - } -} - -static bool -tiffer_next_entry(struct tiffer *self, struct tiffer_entry *entry) -{ - if (!self->remaining_fields) - return false; - - uint16_t type = entry->type = 0xFFFF; - if (!tiffer_u16(self, &entry->tag) || !tiffer_u16(self, &type) || - !tiffer_u32(self, &entry->remaining_count)) - return false; - - // Short values may and will be inlined, rather than pointed to. - size_t values_size = tiffer_value_size(type) * entry->remaining_count; - uint32_t offset = 0; - if (values_size <= sizeof offset) { - entry->p = self->p; - self->p += sizeof offset; - } else if (tiffer_u32(self, &offset)) { - entry->p = self->begin + offset; - } else { - return false; - } - - // All entries are pre-checked not to overflow. - if (entry->p + values_size > self->end) - return false; - - // Setting it at the end may provide an indication while debugging. - entry->type = type; - self->remaining_fields--; - return true; -} - -// --- TIFF/Exif tags ---------------------------------------------------------- - -struct tiff_value { - const char *name; - uint16_t value; -}; - -struct tiff_entry { - const char *name; - uint16_t tag; - struct tiff_value *values; -}; - -static struct tiff_entry tiff_entries[] = { - {"NewSubfileType", 254, NULL}, - {"SubfileType", 255, (struct tiff_value[]) { - {"Full-resolution image data", 1}, - {"Reduced-resolution image data", 2}, - {"Page of a multi-page image", 3}, - {} - }}, - {"ImageWidth", 256, NULL}, - {"ImageLength", 257, NULL}, - {"BitsPerSample", 258, NULL}, - {"Compression", 259, (struct tiff_value[]) { - {"Uncompressed", 1}, - {"CCITT 1D", 2}, - {"Group 3 Fax", 3}, - {"Group 4 Fax", 4}, - {"LZW", 5}, - {"JPEG", 6}, - {"JPEG datastream", 7}, // DRAFT TIFF Technical Note 2 + TIFFphotoshop - {"Deflate/zlib", 8}, // Adobe Photoshop TIFF Technical Notes - {"PackBits", 32773}, - {"Deflate/zlib", 32946}, // Adobe Photoshop TIFF Technical Notes - {} - }}, - {"PhotometricInterpretation", 262, (struct tiff_value[]) { - {"WhiteIsZero", 0}, - {"BlackIsZero", 1}, - {"RGB", 2}, - {"RGB Palette", 3}, - {"Transparency mask", 4}, - {"CMYK", 5}, - {"YCbCr", 6}, - {"CIELab", 8}, - {"ICCLab", 9}, // Adobe PageMaker 6.0 TIFF Technical Notes - {} - }}, - {"Threshholding", 263, (struct tiff_value[]) { - {"No dithering or halftoning", 1}, - {"Ordered dither or halftoning", 2}, - {"Randomized process", 3}, - {} - }}, - {"CellWidth", 264, NULL}, - {"CellLength", 265, NULL}, - {"FillOrder", 266, (struct tiff_value[]) { - {"MSB-first", 1}, - {"LSB-first", 2}, - {} - }}, - {"DocumentName", 269, NULL}, - {"ImageDescription", 270, NULL}, - {"Make", 271, NULL}, - {"Model", 272, NULL}, - {"StripOffsets", 273, NULL}, - {"Orientation", 274, (struct tiff_value[]) { - {"TopLeft", 1}, - {"TopRight", 2}, - {"BottomRight", 3}, - {"BottomLeft", 4}, - {"LeftTop", 5}, - {"RightTop", 6}, - {"RightBottom", 7}, - {"LeftBottom", 8}, - {} - }}, - {"SamplesPerPixel", 277, NULL}, - {"RowsPerStrip", 278, NULL}, - {"StripByteCounts", 279, NULL}, - {"MinSampleValue", 280, NULL}, - {"MaxSampleValue", 281, NULL}, - {"XResolution", 282, NULL}, - {"YResolution", 283, NULL}, - {"PlanarConfiguration", 284, (struct tiff_value[]) { - {"Chunky", 1}, - {"Planar", 2}, - {} - }}, - {"PageName", 285, NULL}, - {"XPosition", 286, NULL}, - {"YPosition", 287, NULL}, - {"FreeOffsets", 288, NULL}, - {"FreeByteCounts", 289, NULL}, - {"GrayResponseUnit", 290, (struct tiff_value[]) { - {"1/10", 1}, - {"1/100", 2}, - {"1/1000", 3}, - {"1/10000", 4}, - {"1/100000", 5}, - {} - }}, - {"GrayResponseCurve", 291, NULL}, - {"T4Options", 292, NULL}, - {"T6Options", 293, NULL}, - {"ResolutionUnit", 296, (struct tiff_value[]) { - {"None", 1}, - {"Inch", 2}, - {"Centimeter", 3}, - {} - }}, - {"PageNumber", 297, NULL}, - {"TransferFunction", 301, NULL}, - {"Software", 305, NULL}, - {"DateTime", 306, NULL}, - {"Artist", 315, NULL}, - {"HostComputer", 316, NULL}, - {"Predictor", 317, (struct tiff_value[]) { - {"None", 1}, - {"Horizontal", 2}, - {"Floating point", 3}, // Adobe Photoshop TIFF Technical Note 3 - {} - }}, - {"WhitePoint", 318, NULL}, - {"PrimaryChromaticities", 319, NULL}, - {"ColorMap", 320, NULL}, - {"HalftoneHints", 321, NULL}, - {"TileWidth", 322, NULL}, - {"TileLength", 323, NULL}, - {"TileOffsets", 324, NULL}, - {"TileByteCounts", 325, NULL}, - {"SubIFDs", 330, NULL}, // TIFF Technical Note 1: TIFF Trees - {"InkSet", 332, (struct tiff_value[]) { - {"CMYK", 1}, - {"Non-CMYK", 2}, - {} - }}, - {"InkNames", 333, NULL}, - {"NumberOfInks", 334, NULL}, - {"DotRange", 336, NULL}, - {"TargetPrinter", 337, NULL}, - {"ExtraSamples", 338, (struct tiff_value[]) { - {"Unspecified", 0}, - {"Associated alpha", 1}, - {"Unassociated alpha", 2}, - {} - }}, - {"SampleFormat", 339, (struct tiff_value[]) { - {"Unsigned integer", 1}, - {"Two's complement signed integer", 2}, - {"IEEE floating-point", 3}, - {"Undefined", 4}, - {} - }}, - {"SMinSampleValue", 340, NULL}, - {"SMaxSampleValue", 341, NULL}, - {"TransferRange", 342, NULL}, - {"ClipPath", 343, NULL}, // TIFF Technical Note 2: Clipping Path - {"XClipPathUnits", 344, NULL}, // TIFF Technical Note 2: Clipping Path - {"YClipPathUnits", 345, NULL}, // TIFF Technical Note 2: Clipping Path - {"Indexed", 346, NULL}, // TIFF Technical Note 3: Indexed Images - {"JPEGTables", 347, NULL}, // DRAFT TIFF Technical Note 2 + TIFFphotoshop - {"OPIProxy", 351, NULL}, // Adobe PageMaker 6.0 TIFF Technical Notes - {"JPEGProc", 512, (struct tiff_value[]) { - {"Baseline sequential", 1}, - {"Lossless Huffman", 14}, - {} - }}, - {"JPEGInterchangeFormat", 513, NULL}, - {"JPEGInterchangeFormatLength", 514, NULL}, - {"JPEGRestartInterval", 515, NULL}, - {"JPEGLosslessPredictors", 517, (struct tiff_value[]) { - {"A", 1}, - {"B", 2}, - {"C", 3}, - {"A+B+C", 4}, - {"A+((B-C)/2)", 5}, - {"B+((A-C)/2)", 6}, - {"(A+B)/2", 7}, - {} - }}, - {"JPEGPointTransforms", 518, NULL}, - {"JPEGQTables", 519, NULL}, - {"JPEGDCTables", 520, NULL}, - {"JPEGACTables", 521, NULL}, - {"YCbCrCoefficients", 529, NULL}, - {"YCbCrSubSampling", 530, NULL}, - {"YCbCrPositioning", 531, (struct tiff_value[]) { - {"Centered", 1}, - {"Co-sited", 2}, - {} - }}, - {"ReferenceBlackWhite", 532, NULL}, - {"ImageID", 32781, NULL}, // Adobe PageMaker 6.0 TIFF Technical Notes - {"Copyright", 33432, NULL}, - // TODO(p): Extract PSIRs, like we do directly with the JPEG segment. - {"Photoshop", 34377, NULL}, // Adobe XMP Specification Part 3 Table 12/39 - {"Exif IFD Pointer", 34665, NULL}, // Exif 2.3 - {"GPS Info IFD Pointer", 34853, NULL}, // Exif 2.3 - // TODO(p): Extract IPTC DataSets, like we do directly with PSIRs. - {"IPTC", 37723, NULL}, // Adobe XMP Specification Part 3 Table 12/39 - {"ImageSourceData", 37724, NULL}, // Adobe Photoshop TIFF Technical Notes - {} -}; - -// Exif 2.3 4.6.5 -static struct tiff_entry exif_entries[] = { - {"ExposureTime", 33434, NULL}, - {"FNumber", 33437, NULL}, - {"ExposureProgram", 34850, (struct tiff_value[]) { - {"Not defined", 0}, - {"Manual", 1}, - {"Normal program", 2}, - {"Aperture priority", 3}, - {"Shutter priority", 4}, - {"Creative program", 5}, - {"Action program", 6}, - {"Portrait mode", 7}, - {"Landscape mode", 8}, - {} - }}, - {"SpectralSensitivity", 34852, NULL}, - {"PhotographicSensitivity", 34855, NULL}, - {"OECF", 34856, NULL}, - {"SensitivityType", 34864, (struct tiff_value[]) { - {"Unknown", 0}, - {"Standard output sensitivity", 1}, - {"Recommended exposure index", 2}, - {"ISO speed", 3}, - {"SOS and REI", 4}, - {"SOS and ISO speed", 5}, - {"REI and ISO speed", 6}, - {"SOS and REI and ISO speed", 7}, - {} - }}, - {"StandardOutputSensitivity", 34865, NULL}, - {"RecommendedExposureIndex", 34866, NULL}, - {"ISOSpeed", 34867, NULL}, - {"ISOSpeedLatitudeyyy", 34868, NULL}, - {"ISOSpeedLatitudezzz", 34869, NULL}, - {"ExifVersion", 36864, NULL}, - {"DateTimeOriginal", 36867, NULL}, - {"DateTimeDigitized", 36868, NULL}, - {"OffsetTime", 36880, NULL}, // 2.31 - {"OffsetTimeOriginal", 36881, NULL}, // 2.31 - {"OffsetTimeDigitized", 36882, NULL}, // 2.31 - {"ComponentsConfiguration", 37121, (struct tiff_value[]) { - {"Does not exist", 0}, - {"Y", 1}, - {"Cb", 2}, - {"Cr", 3}, - {"R", 4}, - {"G", 5}, - {"B", 6}, - {} - }}, - {"CompressedBitsPerPixel", 37122, NULL}, - {"ShutterSpeedValue", 37377, NULL}, - {"ApertureValue", 37378, NULL}, - {"BrightnessValue", 37379, NULL}, - {"ExposureBiasValue", 37380, NULL}, - {"MaxApertureValue", 37381, NULL}, - {"SubjectDistance", 37382, NULL}, - {"MeteringMode", 37383, (struct tiff_value[]) { - {"Unknown", 0}, - {"Average", 1}, - {"CenterWeightedAverage", 2}, - {"Spot", 3}, - {"MultiSpot", 4}, - {"Pattern", 5}, - {"Partial", 6}, - {"Other", 255}, - {} - }}, - {"LightSource", 37384, (struct tiff_value[]) { - {"Unknown", 0}, - {"Daylight", 1}, - {"Fluorescent", 2}, - {"Tungsten (incandescent light)", 3}, - {"Flash", 4}, - {"Fine weather", 9}, - {"Cloudy weather", 10}, - {"Shade", 11}, - {"Daylight fluorescent (D 5700 - 7100K)", 12}, - {"Day white fluorescent (N 4600 - 5500K)", 13}, - {"Cool white fluorescent (W 3800 - 4500K)", 14}, - {"White fluorescent (WW 3250 - 3800K)", 15}, - {"Warm white fluorescent (L 2600 - 3250K)", 16}, - {"Standard light A", 17}, - {"Standard light B", 18}, - {"Standard light C", 19}, - {"D55", 20}, - {"D65", 21}, - {"D75", 22}, - {"D50", 23}, - {"ISO studio tungsten", 24}, - {"Other light source", 255}, - {} - }}, - {"Flash", 37385, NULL}, - {"FocalLength", 37386, NULL}, - {"SubjectArea", 37396, NULL}, - {"MakerNote", 37500, NULL}, - // TODO(p): Decode. - {"UserComment", 37510, NULL}, - {"SubSecTime", 37520, NULL}, - {"SubSecTimeOriginal", 37521, NULL}, - {"SubSecTimeDigitized", 37522, NULL}, - {"Temperature", 37888, NULL}, // 2.31 - {"Humidity", 37889, NULL}, // 2.31 - {"Pressure", 37890, NULL}, // 2.31 - {"WaterDepth", 37891, NULL}, // 2.31 - {"Acceleration", 37892, NULL}, // 2.31 - {"CameraElevationAngle", 37893, NULL}, // 2.31 - {"FlashpixVersion", 40960, NULL}, - {"ColorSpace", 40961, (struct tiff_value[]) { - {"sRGB", 1}, - {"Uncalibrated", 0xFFFF}, - {} - }}, - {"PixelXDimension", 40962, NULL}, - {"PixelYDimension", 40963, NULL}, - {"RelatedSoundFile", 40964, NULL}, - {"Interoperability IFD Pointer", 40965, NULL}, - {"FlashEnergy", 41483, NULL}, - {"SpatialFrequencyResponse", 41484, NULL}, - {"FocalPlaneXResolution", 41486, NULL}, - {"FocalPlaneYResolution", 41487, NULL}, - {"FocalPlaneResolutionUnit", 41488, NULL}, - {"SubjectLocation", 41492, NULL}, - {"ExposureIndex", 41493, NULL}, - {"SensingMethod", 41495, (struct tiff_value[]) { - {"Not defined", 1}, - {"One-chip color area sensor", 2}, - {"Two-chip color area sensor", 3}, - {"Three-chip color area sensor", 4}, - {"Color sequential area sensor", 5}, - {"Trilinear sensor", 7}, - {"Color sequential linear sensor", 8}, - {} - }}, - {"FileSource", 41728, (struct tiff_value[]) { - {"Others", 0}, - {"Scanner of transparent type", 1}, - {"Scanner of reflex type", 2}, - {"DSC", 3}, - {} - }}, - {"SceneType", 41729, (struct tiff_value[]) { - {"Directly-photographed image", 1}, - {} - }}, - {"CFAPattern", 41730, NULL}, - {"CustomRendered", 41985, (struct tiff_value[]) { - {"Normal process", 0}, - {"Custom process", 1}, - {} - }}, - {"ExposureMode", 41986, (struct tiff_value[]) { - {"Auto exposure", 0}, - {"Manual exposure", 1}, - {"Auto bracket", 2}, - {} - }}, - {"WhiteBalance", 41987, (struct tiff_value[]) { - {"Auto white balance", 0}, - {"Manual white balance", 1}, - {} - }}, - {"DigitalZoomRatio", 41988, NULL}, - {"FocalLengthIn35mmFilm", 41989, NULL}, - {"SceneCaptureType", 41990, (struct tiff_value[]) { - {"Standard", 0}, - {"Landscape", 1}, - {"Portrait", 2}, - {"Night scene", 3}, - {} - }}, - {"GainControl", 41991, (struct tiff_value[]) { - {"None", 0}, - {"Low gain up", 1}, - {"High gain up", 2}, - {"Low gain down", 3}, - {"High gain down", 4}, - {} - }}, - {"Contrast", 41992, (struct tiff_value[]) { - {"Normal", 0}, - {"Soft", 1}, - {"Hard", 2}, - {} - }}, - {"Saturation", 41993, (struct tiff_value[]) { - {"Normal", 0}, - {"Low", 1}, - {"High", 2}, - {} - }}, - {"Sharpness", 41994, (struct tiff_value[]) { - {"Normal", 0}, - {"Soft", 1}, - {"Hard", 2}, - {} - }}, - {"DeviceSettingDescription", 41995, NULL}, - {"SubjectDistanceRange", 41996, (struct tiff_value[]) { - {"Unknown", 0}, - {"Macro", 1}, - {"Close view", 2}, - {"Distant view", 3}, - {} - }}, - {"ImageUniqueID", 42016, NULL}, - {"CameraOwnerName", 42032, NULL}, - {"BodySerialNumber", 42033, NULL}, - {"LensSpecification", 42034, NULL}, - {"LensMake", 42035, NULL}, - {"LensModel", 42036, NULL}, - {"LensSerialNumber", 42037, NULL}, - {"CompositeImage", 42080, NULL}, // 2.32 - {"SourceImageNumberOfCompositeImage", 42081, NULL}, // 2.32 - {"SourceExposureTimesOfCompositeImage", 42082, NULL}, // 2.32 - {"Gamma", 42240, NULL}, - {} -}; - -// Exif 2.3 4.6.6 (Notice it starts at 0.) -static struct tiff_entry exif_gps_entries[] = { - {"GPSVersionID", 0, NULL}, - {"GPSLatitudeRef", 1, NULL}, - {"GPSLatitude", 2, NULL}, - {"GPSLongitudeRef", 3, NULL}, - {"GPSLongitude", 4, NULL}, - {"GPSAltitudeRef", 5, (struct tiff_value[]) { - {"Sea level", 0}, - {"Sea level reference (negative value)", 1}, - {} - }}, - {"GPSAltitude", 6, NULL}, - {"GPSTimeStamp", 7, NULL}, - {"GPSSatellites", 8, NULL}, - {"GPSStatus", 9, NULL}, - {"GPSMeasureMode", 10, NULL}, - {"GPSDOP", 11, NULL}, - {"GPSSpeedRef", 12, NULL}, - {"GPSSpeed", 13, NULL}, - {"GPSTrackRef", 14, NULL}, - {"GPSTrack", 15, NULL}, - {"GPSImgDirectionRef", 16, NULL}, - {"GPSImgDirection", 17, NULL}, - {"GPSMapDatum", 18, NULL}, - {"GPSDestLatitudeRef", 19, NULL}, - {"GPSDestLatitude", 20, NULL}, - {"GPSDestLongitudeRef", 21, NULL}, - {"GPSDestLongitude", 22, NULL}, - {"GPSDestBearingRef", 23, NULL}, - {"GPSDestBearing", 24, NULL}, - {"GPSDestDistanceRef", 25, NULL}, - {"GPSDestDistance", 26, NULL}, - {"GPSProcessingMethod", 27, NULL}, - {"GPSAreaInformation", 28, NULL}, - {"GPSDateStamp", 29, NULL}, - {"GPSDifferential", 30, (struct tiff_value[]) { - {"Measurement without differential correction", 0}, - {"Differential correction applied", 1}, - {} - }}, - {"GPSHPositioningError", 31, NULL}, - {} -}; - -// Exif 2.3 4.6.7 (Notice it starts at 1, and collides with GPS.) -static struct tiff_entry exif_interop_entries[] = { - {"InteroperabilityIndex", 1, NULL}, - {} -}; - -// TODO(p): Consider if these can't be inlined into `tiff_entries`. -static struct { - uint16_t tag; - struct tiff_entry *entries; -} tiff_subifds[] = { - {330, tiff_entries}, // SubIFDs - {34665, exif_entries}, // Exif IFD Pointer - {34853, exif_gps_entries}, // GPS Info IFD Pointer - {40965, exif_interop_entries}, // Interoperability IFD Pointer - {} -}; - -// --- Analysis ---------------------------------------------------------------- - -static jv -add_to_subarray(jv o, const char *key, jv value) -{ - // Invalid values are not allocated, and we use up any valid one. - // Beware that jv_get() returns jv_null() rather than jv_invalid(). - // Also, the header comment is lying, jv_is_valid() doesn't unreference. - jv a = jv_object_get(jv_copy(o), jv_string(key)); - return jv_set(o, jv_string(key), - jv_is_valid(a) ? jv_array_append(a, value) : JV_ARRAY(value)); -} - -static jv -add_warning(jv o, const char *message) -{ - return add_to_subarray(o, "warnings", jv_string(message)); -} - -static jv -add_error(jv o, const char *message) -{ - return jv_object_set(o, jv_string("error"), jv_string(message)); -} - -// --- Exif -------------------------------------------------------------------- - -static jv parse_exif_ifd(struct tiffer *T, const struct tiff_entry *info); - -static jv -parse_exif_subifds(struct tiffer *T, const struct tiffer_entry *entry, - struct tiff_entry *info) -{ - int64_t offset = 0; - struct tiffer subT = {}; - if (!tiffer_integer(T, entry, &offset) || - offset < 0 || offset > UINT32_MAX || !tiffer_subifd(T, offset, &subT)) - return jv_null(); - - // The chain should correspond to the values in the entry, - // we are not going to verify it. - jv a = jv_array(); - do a = jv_array_append(a, parse_exif_ifd(&subT, info)); - while (tiffer_next_ifd(&subT)); - return a; -} - -static jv -parse_exif_ascii(struct tiffer_entry *entry) -{ - // Adobe XMP Specification Part 3: Storage in Files, 2020/1, 2.4.2 - // The text may in practice contain any 8-bit encoding, but likely UTF-8. - // TODO(p): Validate UTF-8, and assume Latin 1 if unsuccessful. - jv a = jv_array(); - uint8_t *nul = 0; - while ((nul = memchr(entry->p, 0, entry->remaining_count))) { - size_t len = nul - entry->p; - a = jv_array_append(a, jv_string_sized((const char *) entry->p, len)); - entry->remaining_count -= len + 1; - entry->p += len + 1; - } - - // Trailing NULs are required, but let's extract everything. - if (entry->remaining_count) { - a = jv_array_append(a, - jv_string_sized((const char *) entry->p, entry->remaining_count)); - } - return a; -} - -static jv -parse_exif_undefined(struct tiffer_entry *entry) -{ - // Sometimes, it can be ASCII, but the safe bet is to hex-encode it. - char *buf = binhex(entry->p, entry->remaining_count); - jv s = jv_string(buf); - free(buf); - return s; -} - -static jv -parse_exif_value(const struct tiff_value *values, double real) -{ - if (values) { - for (; values->name; values++) - if (values->value == real) - return jv_string(values->name); - } - return jv_number(real); -} -static jv -parse_exif_extract_sole_array_element(jv a) -{ - return jv_array_length(jv_copy(a)) == 1 ? jv_array_get(a, 0) : a; -} - -static jv -parse_exif_entry(jv o, struct tiffer *T, struct tiffer_entry *entry, - const struct tiff_entry *info) -{ - if (!info) - info = (struct tiff_entry[]) {{}}; - - for (; info->name; info++) - if (info->tag == entry->tag) - break; - - struct tiff_entry *subentries = NULL; - for (size_t i = 0; tiff_subifds[i].tag; i++) - if (tiff_subifds[i].tag == entry->tag) - subentries = tiff_subifds[i].entries; - - jv v = jv_true(); - double real = 0; - if (!entry->remaining_count) { - v = jv_null(); - } else if (entry->type == IFD || subentries) { - v = parse_exif_subifds(T, entry, subentries); - } else if (entry->type == ASCII) { - v = parse_exif_extract_sole_array_element(parse_exif_ascii(entry)); - } else if (entry->type == UNDEFINED && !info->values) { - // Several Exif entries of UNDEFINED type contain single-byte numbers. - v = parse_exif_undefined(entry); - } else if (tiffer_real(T, entry, &real)) { - v = jv_array(); - do v = jv_array_append(v, parse_exif_value(info->values, real)); - while (tiffer_next_value(entry) && tiffer_real(T, entry, &real)); - v = parse_exif_extract_sole_array_element(v); - } - - if (info->name) - return jv_set(o, jv_string(info->name), v); - return jv_set(o, jv_string_fmt("%u", entry->tag), v); -} - -static jv -parse_exif_ifd(struct tiffer *T, const struct tiff_entry *info) -{ - jv ifd = jv_object(); - struct tiffer_entry entry = {}; - while (tiffer_next_entry(T, &entry)) - ifd = parse_exif_entry(ifd, T, &entry, info); - return ifd; -} - -static jv -parse_exif(jv o, const uint8_t *p, size_t len) -{ - struct tiffer T = {}; - if (!tiffer_init(&T, p, len)) - return add_warning(o, "invalid Exif"); - while (tiffer_next_ifd(&T)) - o = add_to_subarray(o, "Exif", parse_exif_ifd(&T, tiff_entries)); - return o; -} // --- ICC profiles ------------------------------------------------------------ // v2 https://www.color.org/ICC_Minor_Revision_for_Web.pdf @@ -1099,267 +118,6 @@ parse_icc(jv o, const uint8_t *profile, size_t profile_len) return jv_set(o, jv_string("ICC"), jv_bool(true)); } -// --- Photoshop Image Resources ----------------------------------------------- -// Adobe XMP Specification Part 3: Storage in Files, 2020/1, 1.1.3 + 3.1.3 -// https://www.adobe.com/devnet-apps/photoshop/fileformatashtml/ -// Unless otherwise noted, the descriptions are derived from the above document. - -static struct { - uint16_t id; - const char *description; -} psir_descriptions[] = { - {1000, "Number of channels, rows, columns, depth, mode"}, - {1001, "Macintosh print manager print info record"}, - {1002, "Macintosh page format information"}, - {1003, "Indexed color table"}, - {1005, "Resolution information"}, - {1006, "Names of alpha channels (Pascal strings)"}, - {1007, "Display information"}, - {1008, "Caption (Pascal string)"}, // XMP Part 3 3.3.3 - {1009, "Border information"}, - {1010, "Background color"}, - {1011, "Print flags"}, - {1012, "Grayscale and multichannel halftoning information"}, - {1013, "Color halftoning information"}, - {1014, "Duotone halftoning information"}, - {1015, "Grayscale and multichannel transfer function"}, - {1016, "Color transfer functions"}, - {1017, "Duotone transfer functions"}, - {1018, "Duotone image information"}, - {1019, "Effective B/W values for the dot range"}, - {1020, "Caption"}, // XMP Part 3 3.3.3 - {1021, "EPS options"}, - {1022, "Quick Mask information"}, - {1023, "(Obsolete)"}, - {1024, "Layer state information"}, - {1025, "Working path (not saved)"}, - {1026, "Layers group information"}, - {1027, "(Obsolete)"}, - {1028, "IPTC DataSets"}, // XMP Part 3 3.3.3 - {1029, "Image mode for raw format files"}, - {1030, "JPEG quality"}, - {1032, "Grid and guides information"}, - {1033, "Thumbnail resource"}, - {1034, "Copyright flag"}, - {1035, "Copyright information URL"}, // XMP Part 3 3.3.3 - {1036, "Thumbnail resource"}, - {1037, "Global lighting angle for effects layer"}, - {1038, "Color samplers information"}, - {1039, "ICC profile"}, - {1040, "Watermark"}, - {1041, "ICC untagged profile flag"}, - {1042, "Effects visible flag"}, - {1043, "Spot halftone"}, - {1044, "Document-specific IDs seed number"}, - {1045, "Unicode alpha names"}, - {1046, "Indexed color table count"}, - {1047, "Transparent color index"}, - {1049, "Global altitude"}, - {1050, "Slices"}, - {1051, "Workflow URL"}, - {1052, "Jump To XPEP"}, - {1053, "Alpha identifiers"}, - {1054, "URL list"}, - {1057, "Version info"}, - {1058, "Exif metadata 1"}, - {1059, "Exif metadata 3"}, - {1060, "XMP metadata"}, - {1061, "MD5 digest of IPTC data"}, // XMP Part 3 3.3.3 - {1062, "Print scale"}, - {1064, "Pixel aspect ratio"}, - {1065, "Layer comps"}, - {1066, "Alternate duotone colors"}, - {1067, "Alternate spot colors"}, - {1069, "Layer selection IDs"}, - {1070, "HDR toning information"}, - {1071, "Print info"}, - {1072, "Layer group(s) enabled ID"}, - {1073, "Color samplers"}, - {1074, "Measurement scale"}, - {1075, "Timeline information"}, - {1076, "Sheet disclosure"}, - {1077, "Display information to support floating point colors"}, - {1078, "Onion skins"}, - {1080, "Count information"}, - {1082, "Print information"}, - {1083, "Print style"}, - {1084, "Macintosh NSPrintInfo"}, - {1085, "Windows DEVMODE"}, - {1086, "Autosave file path"}, - {1087, "Autosave format"}, - {1088, "Path selection state"}, - // {2000-2997, "Saved paths"}, - {2999, "Name of clipping path"}, - {3000, "Origin path information"}, - // {4000-4999, "Plug-in resource"}, - {7000, "Image Ready variables"}, - {7001, "Image Ready data sets"}, - {7002, "Image Ready default selected state"}, - {7003, "Image Ready 7 rollover expanded state"}, - {7004, "Image Ready rollover expanded state"}, - {7005, "Image Ready save layer settings"}, - {7006, "Image Ready version"}, - {8000, "Lightroom workflow"}, - {10000, "Print flags"}, - {} -}; - -static jv -process_psir_thumbnail(jv res, const uint8_t *data, size_t len) -{ - uint32_t format_number = u32be(data + 0); - uint32_t compressed_size = u32be(data + 20); - - // TODO(p): Recurse into the thumbnail if it's a JPEG. - jv format = jv_number(format_number); - switch (format_number) { - break; case 0: format = jv_string("kJpegRGB"); - break; case 1: format = jv_string("kRawRGB"); - } - - res = jv_object_merge(res, JV_OBJECT( - jv_string("Format"), format, - jv_string("Width"), jv_number(u32be(data + 4)), - jv_string("Height"), jv_number(u32be(data + 8)), - jv_string("Stride"), jv_number(u32be(data + 12)), - jv_string("TotalSize"), jv_number(u32be(data + 16)), - jv_string("CompressedSize"), jv_number(compressed_size), - jv_string("BitsPerPixel"), jv_number(u16be(data + 24)), - jv_string("Planes"), jv_number(u16be(data + 26)) - )); - if (28 + compressed_size <= len) { - char *buf = binhex(data + 28, compressed_size); - res = jv_set(res, jv_string("Data"), jv_string(buf)); - free(buf); - } - return res; -} - -static const char * -process_iptc_dataset(jv *a, const uint8_t **p, size_t len) -{ - const uint8_t *header = *p; - if (len < 5) - return "unexpected end of IPTC data"; - if (*header != 0x1c) - return "invalid tag marker"; - - uint8_t record = header[1]; - uint8_t dataset = header[2]; - uint16_t byte_count = header[3] << 8 | header[4]; - - // TODO(p): Although highly unlikely to appear, we could decode it. - if (byte_count & 0x8000) - return "unsupported extended DataSet"; - if (len - 5 < byte_count) - return "data overrun"; - - char *buf = binhex(header + 5, byte_count); - *p += 5 + byte_count; - *a = jv_array_append(*a, JV_OBJECT( - jv_string("DataSet"), jv_string_fmt("%u:%u", record, dataset), - jv_string("Data"), jv_string(buf) - )); - free(buf); - return NULL; -} - -static jv -process_psir_iptc(jv res, const uint8_t *data, size_t len) -{ - // https://iptc.org/standards/iim/ - // https://iptc.org/std/IIM/4.2/specification/IIMV4.2.pdf - jv a = jv_array(); - const uint8_t *end = data + len; - while (data < end) { - const char *err = process_iptc_dataset(&a, &data, end - data); - if (err) { - a = jv_array_append(a, jv_string(err)); - break; - } - } - return jv_set(res, jv_string("DataSets"), a); -} - -static jv -process_psir(jv o, uint16_t resource_id, const char *name, - const uint8_t *data, size_t len) -{ - const char *description = NULL; - if (resource_id >= 2000 && resource_id <= 2997) - description = "Saved paths"; - if (resource_id >= 4000 && resource_id <= 4999) - description = "Plug-in resource"; - for (size_t i = 0; psir_descriptions[i].id; i++) - if (psir_descriptions[i].id == resource_id) - description = psir_descriptions[i].description; - - jv res = JV_OBJECT( - jv_string("name"), jv_string(name), - jv_string("id"), jv_number(resource_id), - jv_string("description"), - description ? jv_string(description) : jv_null(), - jv_string("size"), jv_number(len) - ); - - // Both are thumbnails, older is BGR, newer is RGB. - if ((resource_id == 1033 || resource_id == 1036) && len >= 28) - res = process_psir_thumbnail(res, data, len); - if (resource_id == 1028) - res = process_psir_iptc(res, data, len); - - return add_to_subarray(o, "PSIR", res); -} - -static jv -parse_psir_block(jv o, const uint8_t *p, size_t len, size_t *advance) -{ - *advance = 0; - if (len < 8 || memcmp(p, "8BIM", 4)) - return add_warning(o, "bad PSIR block header"); - - uint16_t resource_id = u16be(p + 4); - uint8_t name_len = p[6]; - const uint8_t *name = &p[7]; - - // Add one byte for the Pascal-ish string length prefix, - // then another one for padding to make the length even. - size_t name_len_full = (name_len + 2) & ~1U; - - size_t resource_len_offset = 6 + name_len_full, - header_len = resource_len_offset + 4; - if (len < header_len) - return add_warning(o, "bad PSIR block header"); - - uint32_t resource_len = u32be(p + resource_len_offset); - size_t resource_len_padded = (resource_len + 1) & ~1U; - if (resource_len_padded < resource_len || - len < header_len + resource_len_padded) - return add_warning(o, "runaway PSIR block"); - - char *cname = calloc(1, name_len_full); - strncpy(cname, (const char *) name, name_len); - o = process_psir(o, resource_id, cname, p + header_len, resource_len); - free(cname); - - *advance = header_len + resource_len_padded; - return o; -} - -static jv -parse_psir(jv o, const uint8_t *p, size_t len) -{ - if (len == 0) - return add_warning(o, "empty PSIR data"); - - size_t advance = 0; - while (len && (o = parse_psir_block(o, p, len, &advance), advance)) { - p += advance; - len -= advance; - } - return o; -} - // --- Multi-Picture Format ---------------------------------------------------- enum { |