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-rw-r--r--tdefile-plugins/jpeg/exif.cpp961
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diff --git a/tdefile-plugins/jpeg/exif.cpp b/tdefile-plugins/jpeg/exif.cpp
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+++ b/tdefile-plugins/jpeg/exif.cpp
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+//--------------------------------------------------------------------------
+// Program to pull the information out of various types of EFIF digital
+// camera files and show it in a reasonably consistent way
+//
+// This module parses the very complicated exif structures.
+//
+// Matthias Wandel, Dec 1999 - August 2000
+//--------------------------------------------------------------------------
+
+
+#include "exif.h"
+#include <tqwmatrix.h>
+#include <kglobal.h>
+
+
+static unsigned char * LastExifRefd;
+static int ExifSettingsLength;
+static double FocalplaneXRes;
+static double FocalplaneUnits;
+static int MotorolaOrder = 0;
+static int SectionsRead;
+//static int HaveAll;
+
+//--------------------------------------------------------------------------
+// Table of Jpeg encoding process names
+
+#define M_SOF0 0xC0 // Start Of Frame N
+#define M_SOF1 0xC1 // N indicates which compression process
+#define M_SOF2 0xC2 // Only SOF0-SOF2 are now in common use
+#define M_SOF3 0xC3
+#define M_SOF5 0xC5 // NB: codes C4 and CC are NOT SOF markers
+#define M_SOF6 0xC6
+#define M_SOF7 0xC7
+#define M_SOF9 0xC9
+#define M_SOF10 0xCA
+#define M_SOF11 0xCB
+#define M_SOF13 0xCD
+#define M_SOF14 0xCE
+#define M_SOF15 0xCF
+#define M_SOI 0xD8 // Start Of Image (beginning of datastream)
+#define M_EOI 0xD9 // End Of Image (end of datastream)
+#define M_SOS 0xDA // Start Of Scan (begins compressed data)
+#define M_JFIF 0xE0 // Jfif marker
+#define M_EXIF 0xE1 // Exif marker
+#define M_COM 0xFE // COMment
+
+
+TagTable_t ProcessTable[] = {
+ { M_SOF0, "Baseline"},
+ { M_SOF1, "Extended sequential"},
+ { M_SOF2, "Progressive"},
+ { M_SOF3, "Lossless"},
+ { M_SOF5, "Differential sequential"},
+ { M_SOF6, "Differential progressive"},
+ { M_SOF7, "Differential lossless"},
+ { M_SOF9, "Extended sequential, arithmetic coding"},
+ { M_SOF10, "Progressive, arithmetic coding"},
+ { M_SOF11, "Lossless, arithmetic coding"},
+ { M_SOF13, "Differential sequential, arithmetic coding"},
+ { M_SOF14, "Differential progressive, arithmetic coding"},
+ { M_SOF15, "Differential lossless, arithmetic coding"},
+ { 0, "Unknown"}
+};
+
+
+
+//--------------------------------------------------------------------------
+// Describes format descriptor
+static int BytesPerFormat[] = {0,1,1,2,4,8,1,1,2,4,8,4,8};
+#define NUM_FORMATS 12
+
+#define FMT_BYTE 1
+#define FMT_STRING 2
+#define FMT_USHORT 3
+#define FMT_ULONG 4
+#define FMT_URATIONAL 5
+#define FMT_SBYTE 6
+#define FMT_UNDEFINED 7
+#define FMT_SSHORT 8
+#define FMT_SLONG 9
+#define FMT_SRATIONAL 10
+#define FMT_SINGLE 11
+#define FMT_DOUBLE 12
+
+//--------------------------------------------------------------------------
+// Describes tag values
+
+#define TAG_EXIF_OFFSET 0x8769
+#define TAG_INTEROP_OFFSET 0xa005
+
+#define TAG_MAKE 0x010F
+#define TAG_MODEL 0x0110
+#define TAG_ORIENTATION 0x0112
+
+#define TAG_EXPOSURETIME 0x829A
+#define TAG_FNUMBER 0x829D
+
+#define TAG_SHUTTERSPEED 0x9201
+#define TAG_APERTURE 0x9202
+#define TAG_MAXAPERTURE 0x9205
+#define TAG_FOCALLENGTH 0x920A
+
+#define TAG_DATETIME_ORIGINAL 0x9003
+#define TAG_USERCOMMENT 0x9286
+
+#define TAG_SUBJECT_DISTANCE 0x9206
+#define TAG_FLASH 0x9209
+
+#define TAG_FOCALPLANEXRES 0xa20E
+#define TAG_FOCALPLANEUNITS 0xa210
+#define TAG_EXIF_IMAGEWIDTH 0xA002
+#define TAG_EXIF_IMAGELENGTH 0xA003
+
+// the following is added 05-jan-2001 vcs
+#define TAG_EXPOSURE_BIAS 0x9204
+#define TAG_WHITEBALANCE 0x9208
+#define TAG_METERING_MODE 0x9207
+#define TAG_EXPOSURE_PROGRAM 0x8822
+#define TAG_ISO_EQUIVALENT 0x8827
+#define TAG_COMPRESSION_LEVEL 0x9102
+
+#define TAG_THUMBNAIL_OFFSET 0x0201
+#define TAG_THUMBNAIL_LENGTH 0x0202
+
+
+/*static TagTable_t TagTable[] = {
+ { 0x100, "ImageWidth"},
+ { 0x101, "ImageLength"},
+ { 0x102, "BitsPerSample"},
+ { 0x103, "Compression"},
+ { 0x106, "PhotometricInterpretation"},
+ { 0x10A, "FillOrder"},
+ { 0x10D, "DocumentName"},
+ { 0x10E, "ImageDescription"},
+ { 0x10F, "Make"},
+ { 0x110, "Model"},
+ { 0x111, "StripOffsets"},
+ { 0x112, "Orientation"},
+ { 0x115, "SamplesPerPixel"},
+ { 0x116, "RowsPerStrip"},
+ { 0x117, "StripByteCounts"},
+ { 0x11A, "XResolution"},
+ { 0x11B, "YResolution"},
+ { 0x11C, "PlanarConfiguration"},
+ { 0x128, "ResolutionUnit"},
+ { 0x12D, "TransferFunction"},
+ { 0x131, "Software"},
+ { 0x132, "DateTime"},
+ { 0x13B, "Artist"},
+ { 0x13E, "WhitePoint"},
+ { 0x13F, "PrimaryChromaticities"},
+ { 0x156, "TransferRange"},
+ { 0x200, "JPEGProc"},
+ { 0x201, "ThumbnailOffset"},
+ { 0x202, "ThumbnailLength"},
+ { 0x211, "YCbCrCoefficients"},
+ { 0x212, "YCbCrSubSampling"},
+ { 0x213, "YCbCrPositioning"},
+ { 0x214, "ReferenceBlackWhite"},
+ { 0x828D, "CFARepeatPatternDim"},
+ { 0x828E, "CFAPattern"},
+ { 0x828F, "BatteryLevel"},
+ { 0x8298, "Copyright"},
+ { 0x829A, "ExposureTime"},
+ { 0x829D, "FNumber"},
+ { 0x83BB, "IPTC/NAA"},
+ { 0x8769, "ExifOffset"},
+ { 0x8773, "InterColorProfile"},
+ { 0x8822, "ExposureProgram"},
+ { 0x8824, "SpectralSensitivity"},
+ { 0x8825, "GPSInfo"},
+ { 0x8827, "ISOSpeedRatings"},
+ { 0x8828, "OECF"},
+ { 0x9000, "ExifVersion"},
+ { 0x9003, "DateTimeOriginal"},
+ { 0x9004, "DateTimeDigitized"},
+ { 0x9101, "ComponentsConfiguration"},
+ { 0x9102, "CompressedBitsPerPixel"},
+ { 0x9201, "ShutterSpeedValue"},
+ { 0x9202, "ApertureValue"},
+ { 0x9203, "BrightnessValue"},
+ { 0x9204, "ExposureBiasValue"},
+ { 0x9205, "MaxApertureValue"},
+ { 0x9206, "SubjectDistance"},
+ { 0x9207, "MeteringMode"},
+ { 0x9208, "LightSource"},
+ { 0x9209, "Flash"},
+ { 0x920A, "FocalLength"},
+ { 0x927C, "MakerNote"},
+ { 0x9286, "UserComment"},
+ { 0x9290, "SubSecTime"},
+ { 0x9291, "SubSecTimeOriginal"},
+ { 0x9292, "SubSecTimeDigitized"},
+ { 0xA000, "FlashPixVersion"},
+ { 0xA001, "ColorSpace"},
+ { 0xA002, "ExifImageWidth"},
+ { 0xA003, "ExifImageLength"},
+ { 0xA005, "InteroperabilityOffset"},
+ { 0xA20B, "FlashEnergy"}, // 0x920B in TIFF/EP
+ { 0xA20C, "SpatialFrequencyResponse"}, // 0x920C - -
+ { 0xA20E, "FocalPlaneXResolution"}, // 0x920E - -
+ { 0xA20F, "FocalPlaneYResolution"}, // 0x920F - -
+ { 0xA210, "FocalPlaneResolutionUnit"}, // 0x9210 - -
+ { 0xA214, "SubjectLocation"}, // 0x9214 - -
+ { 0xA215, "ExposureIndex"}, // 0x9215 - -
+ { 0xA217, "SensingMethod"}, // 0x9217 - -
+ { 0xA300, "FileSource"},
+ { 0xA301, "SceneType"},
+ { 0, NULL}
+} ;
+*/
+
+
+//--------------------------------------------------------------------------
+// Parse the marker stream until SOS or EOI is seen;
+//--------------------------------------------------------------------------
+int ExifData::ReadJpegSections (TQFile & infile, ReadMode_t ReadMode)
+{
+ int a;
+
+ a = infile.getch();
+
+ if (a != 0xff || infile.getch() != M_SOI) {
+ SectionsRead = 0;
+ return false;
+ }
+ for(SectionsRead = 0; SectionsRead < MAX_SECTIONS-1; ){
+ int marker = 0;
+ int got;
+ unsigned int ll,lh;
+ unsigned int itemlen;
+ uchar * Data;
+
+ for (a=0;a<7;a++){
+ marker = infile.getch();
+ if (marker != 0xff) break;
+
+ if (a >= 6){
+
+ kdDebug(7034) << "too many padding bytes\n";
+ return false;
+
+ }
+ }
+
+ if (marker == 0xff){
+ // 0xff is legal padding, but if we get that many, something's wrong.
+ throw FatalError("too many padding bytes!");
+ }
+
+ Sections[SectionsRead].Type = marker;
+
+ // Read the length of the section.
+ lh = (uchar) infile.getch();
+ ll = (uchar) infile.getch();
+
+ itemlen = (lh << 8) | ll;
+
+ if (itemlen < 2) {
+ throw FatalError("invalid marker");
+ }
+
+ Sections[SectionsRead].Size = itemlen;
+
+ Data = (uchar *)malloc(itemlen+1); // Add 1 to allow sticking a 0 at the end.
+ Sections[SectionsRead].Data = Data;
+
+ // Store first two pre-read bytes.
+ Data[0] = (uchar)lh;
+ Data[1] = (uchar)ll;
+
+ got = infile.readBlock((char*)Data+2, itemlen-2); // Read the whole section.
+ if (( unsigned ) got != itemlen-2){
+ throw FatalError("reading from file");
+ }
+ SectionsRead++;
+
+ switch(marker){
+
+ case M_SOS: // stop before hitting compressed data
+ // If reading entire image is requested, read the rest of the data.
+ if (ReadMode & READ_IMAGE){
+ unsigned long size;
+
+ size = kMax( 0ul, (unsigned long)(infile.size()-infile.at()) );
+ Data = (uchar *)malloc(size);
+ if (Data == NULL){
+ throw FatalError("could not allocate data for entire image");
+ }
+
+ got = infile.readBlock((char*)Data, size);
+ if (( unsigned ) got != size){
+ throw FatalError("could not read the rest of the image");
+ }
+
+ Sections[SectionsRead].Data = Data;
+ Sections[SectionsRead].Size = size;
+ Sections[SectionsRead].Type = PSEUDO_IMAGE_MARKER;
+ SectionsRead ++;
+ //HaveAll = 1;
+ }
+ return true;
+
+ case M_EOI: // in case it's a tables-only JPEG stream
+ kdDebug(7034) << "No image in jpeg!\n";
+ return false;
+
+ case M_COM: // Comment section
+ // pieczy 2002-02-12
+ // now the User comment goes to UserComment
+ // so we can store a Comment section also in READ_EXIF mode
+ process_COM(Data, itemlen);
+ break;
+
+ case M_JFIF:
+ // Regular jpegs always have this tag, exif images have the exif
+ // marker instead, althogh ACDsee will write images with both markers.
+ // this program will re-create this marker on absence of exif marker.
+ // hence no need to keep the copy from the file.
+ free(Sections[--SectionsRead].Data);
+ break;
+
+ case M_EXIF:
+ // Seen files from some 'U-lead' software with Vivitar scanner
+ // that uses marker 31 for non exif stuff. Thus make sure
+ // it says 'Exif' in the section before treating it as exif.
+ if ((ReadMode & READ_EXIF) && memcmp(Data+2, "Exif", 4) == 0){
+ process_EXIF((uchar *)Data, itemlen); // FIXME: This call
+ // requires Data to be array of at least 8 bytes. Code
+ // above only checks for itemlen < 2.
+ }else{
+ // Discard this section.
+ free(Sections[--SectionsRead].Data);
+ }
+ break;
+
+ case M_SOF0:
+ case M_SOF1:
+ case M_SOF2:
+ case M_SOF3:
+ case M_SOF5:
+ case M_SOF6:
+ case M_SOF7:
+ case M_SOF9:
+ case M_SOF10:
+ case M_SOF11:
+ case M_SOF13:
+ case M_SOF14:
+ case M_SOF15:
+ process_SOFn(Data, marker); //FIXME: This call requires Data to
+ // be array of at least 8 bytes. Code above only checks for
+ // itemlen < 2.
+ break;
+ default:
+ break;
+ }
+ }
+ return true;
+}
+
+
+//--------------------------------------------------------------------------
+// Discard read data.
+//--------------------------------------------------------------------------
+void ExifData::DiscardData(void)
+{
+ for (int a=0; a < SectionsRead; a++)
+ free(Sections[a].Data);
+ SectionsRead = 0;
+}
+
+//--------------------------------------------------------------------------
+// Convert a 16 bit unsigned value from file's native byte order
+//--------------------------------------------------------------------------
+int ExifData::Get16u(void * Short)
+{
+ if (MotorolaOrder){
+ return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
+ }else{
+ return (((uchar *)Short)[1] << 8) | ((uchar *)Short)[0];
+ }
+}
+
+//--------------------------------------------------------------------------
+// Convert a 32 bit signed value from file's native byte order
+//--------------------------------------------------------------------------
+int ExifData::Get32s(void * Long)
+{
+ if (MotorolaOrder){
+ return ((( char *)Long)[0] << 24) | (((uchar *)Long)[1] << 16)
+ | (((uchar *)Long)[2] << 8 ) | (((uchar *)Long)[3] << 0 );
+ }else{
+ return ((( char *)Long)[3] << 24) | (((uchar *)Long)[2] << 16)
+ | (((uchar *)Long)[1] << 8 ) | (((uchar *)Long)[0] << 0 );
+ }
+}
+
+//--------------------------------------------------------------------------
+// Convert a 32 bit unsigned value from file's native byte order
+//--------------------------------------------------------------------------
+unsigned ExifData::Get32u(void * Long)
+{
+ return (unsigned)Get32s(Long) & 0xffffffff;
+}
+
+//--------------------------------------------------------------------------
+// Evaluate number, be it int, rational, or float from directory.
+//--------------------------------------------------------------------------
+double ExifData::ConvertAnyFormat(void * ValuePtr, int Format)
+{
+ double Value;
+ Value = 0;
+
+ switch(Format){
+ case FMT_SBYTE: Value = *(signed char *)ValuePtr; break;
+ case FMT_BYTE: Value = *(uchar *)ValuePtr; break;
+
+ case FMT_USHORT: Value = Get16u(ValuePtr); break;
+
+ case FMT_ULONG: Value = Get32u(ValuePtr); break;
+
+ case FMT_URATIONAL:
+ case FMT_SRATIONAL:
+ {
+ int Num,Den;
+ Num = Get32s(ValuePtr);
+ Den = Get32s(4+(char *)ValuePtr);
+ if (Den == 0){
+ Value = 0;
+ }else{
+ Value = (double)Num/Den;
+ }
+ break;
+ }
+
+ case FMT_SSHORT: Value = (signed short)Get16u(ValuePtr); break;
+ case FMT_SLONG: Value = Get32s(ValuePtr); break;
+
+ // Not sure if this is correct (never seen float used in Exif format)
+ case FMT_SINGLE: Value = (double)*(float *)ValuePtr; break;
+ case FMT_DOUBLE: Value = *(double *)ValuePtr; break;
+ }
+ return Value;
+}
+
+//--------------------------------------------------------------------------
+// Process one of the nested EXIF directories.
+//--------------------------------------------------------------------------
+void ExifData::ProcessExifDir(unsigned char * DirStart, unsigned char * OffsetBase, unsigned ExifLength, unsigned NestingLevel)
+{
+ int de;
+ int a;
+ int NumDirEntries;
+ unsigned ThumbnailOffset = 0;
+ unsigned ThumbnailSize = 0;
+
+ if ( NestingLevel > 4)
+ throw FatalError("Maximum directory nesting exceeded (corrupt exif header)");
+
+ NumDirEntries = Get16u(DirStart);
+ #define DIR_ENTRY_ADDR(Start, Entry) (Start+2+12*(Entry))
+
+ {
+ unsigned char * DirEnd;
+ DirEnd = DIR_ENTRY_ADDR(DirStart, NumDirEntries);
+ if (DirEnd+4 > (OffsetBase+ExifLength)){
+ if (DirEnd+2 == OffsetBase+ExifLength || DirEnd == OffsetBase+ExifLength){
+ // Version 1.3 of jhead would truncate a bit too much.
+ // This also caught later on as well.
+ }else{
+ // Note: Files that had thumbnails trimmed with jhead 1.3 or earlier
+ // might trigger this.
+ throw FatalError("Illegally sized directory");
+ }
+ }
+ if (DirEnd < LastExifRefd) LastExifRefd = DirEnd;
+ }
+
+ for (de=0;de<NumDirEntries;de++){
+ int Tag, Format, Components;
+ unsigned char * ValuePtr;
+ unsigned ByteCount;
+ char * DirEntry;
+ DirEntry = (char *)DIR_ENTRY_ADDR(DirStart, de);
+
+ Tag = Get16u(DirEntry);
+ Format = Get16u(DirEntry+2);
+ Components = Get32u(DirEntry+4);
+
+ if ((Format-1) >= NUM_FORMATS) {
+ // (-1) catches illegal zero case as unsigned underflows to positive large.
+ throw FatalError("Illegal format code in EXIF dir");
+ }
+
+ if ((unsigned)Components > 0x10000) {
+ throw FatalError("Illegal number of components for tag");
+ continue;
+ }
+
+ ByteCount = Components * BytesPerFormat[Format];
+
+ if (ByteCount > 4){
+ unsigned OffsetVal;
+ OffsetVal = Get32u(DirEntry+8);
+ // If its bigger than 4 bytes, the dir entry contains an offset.
+ if (OffsetVal+ByteCount > ExifLength){
+ // Bogus pointer offset and / or bytecount value
+ //printf("Offset %d bytes %d ExifLen %d\n",OffsetVal, ByteCount, ExifLength);
+
+ throw FatalError("Illegal pointer offset value in EXIF");
+ }
+ ValuePtr = OffsetBase+OffsetVal;
+ }else{
+ // 4 bytes or less and value is in the dir entry itself
+ ValuePtr = (unsigned char *)DirEntry+8;
+ }
+
+ if (LastExifRefd < ValuePtr+ByteCount){
+ // Keep track of last byte in the exif header that was actually referenced.
+ // That way, we know where the discardable thumbnail data begins.
+ LastExifRefd = ValuePtr+ByteCount;
+ }
+
+ // Extract useful components of tag
+ switch(Tag){
+
+ case TAG_MAKE:
+ ExifData::CameraMake = TQString::fromLatin1((const char*)ValuePtr, 31);
+ break;
+
+ case TAG_MODEL:
+ ExifData::CameraModel = TQString::fromLatin1((const char*)ValuePtr, 39);
+ break;
+
+ case TAG_ORIENTATION:
+ Orientation = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_DATETIME_ORIGINAL:
+ DateTime = TQString::fromLatin1((const char*)ValuePtr, 19);
+ break;
+
+ case TAG_USERCOMMENT:
+ // Olympus has this padded with trailing spaces. Remove these first.
+ for (a=ByteCount;;){
+ a--;
+ if ((ValuePtr)[a] == ' '){
+ (ValuePtr)[a] = '\0';
+ }else{
+ break;
+ }
+ if (a == 0) break;
+ }
+
+ // Copy the comment
+ if (memcmp(ValuePtr, "ASCII",5) == 0){
+ for (a=5;a<10;a++){
+ int c;
+ c = (ValuePtr)[a];
+ if (c != '\0' && c != ' '){
+ UserComment = TQString::fromLatin1((const char*)(a+ValuePtr), 199);
+ break;
+ }
+ }
+ }else{
+ UserComment = TQString::fromLatin1((const char*)ValuePtr, 199);
+ }
+ break;
+
+ case TAG_FNUMBER:
+ // Simplest way of expressing aperture, so I trust it the most.
+ // (overwrite previously computd value if there is one)
+ ExifData::ApertureFNumber = (float)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_APERTURE:
+ case TAG_MAXAPERTURE:
+ // More relevant info always comes earlier, so only use this field if we don't
+ // have appropriate aperture information yet.
+ if (ExifData::ApertureFNumber == 0){
+ ExifData::ApertureFNumber
+ = (float)exp(ConvertAnyFormat(ValuePtr, Format)*log(2.0)*0.5);
+ }
+ break;
+
+ case TAG_FOCALLENGTH:
+ // Nice digital cameras actually save the focal length as a function
+ // of how far they are zoomed in.
+ ExifData::FocalLength = (float)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_SUBJECT_DISTANCE:
+ // Inidcates the distacne the autofocus camera is focused to.
+ // Tends to be less accurate as distance increases.
+ ExifData::Distance = (float)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_EXPOSURETIME:
+ // Simplest way of expressing exposure time, so I trust it most.
+ // (overwrite previously computd value if there is one)
+ ExifData::ExposureTime = (float)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_SHUTTERSPEED:
+ // More complicated way of expressing exposure time, so only use
+ // this value if we don't already have it from somewhere else.
+ if (ExifData::ExposureTime == 0){
+ ExifData::ExposureTime
+ = (float)(1/exp(ConvertAnyFormat(ValuePtr, Format)*log(2.0)));
+ }
+ break;
+
+ case TAG_FLASH:
+ ExifData::FlashUsed = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_EXIF_IMAGELENGTH:
+ ExifImageLength = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_EXIF_IMAGEWIDTH:
+ ExifImageWidth = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_FOCALPLANEXRES:
+ FocalplaneXRes = ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_FOCALPLANEUNITS:
+ switch((int)ConvertAnyFormat(ValuePtr, Format)){
+ case 1: FocalplaneUnits = 25.4; break; // inch
+ case 2:
+ // According to the information I was using, 2 means meters.
+ // But looking at the Cannon powershot's files, inches is the only
+ // sensible value.
+ FocalplaneUnits = 25.4;
+ break;
+
+ case 3: FocalplaneUnits = 10; break; // centimeter
+ case 4: FocalplaneUnits = 1; break; // milimeter
+ case 5: FocalplaneUnits = .001; break; // micrometer
+ }
+ break;
+
+ // Remaining cases contributed by: Volker C. Schoech ([email protected])
+
+ case TAG_EXPOSURE_BIAS:
+ ExifData::ExposureBias = (float)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_WHITEBALANCE:
+ ExifData::Whitebalance = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_METERING_MODE:
+ ExifData::MeteringMode = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_EXPOSURE_PROGRAM:
+ ExifData::ExposureProgram = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_ISO_EQUIVALENT:
+ ExifData::ISOequivalent = (int)ConvertAnyFormat(ValuePtr, Format);
+ if ( ExifData::ISOequivalent < 50 ) ExifData::ISOequivalent *= 200;
+ break;
+
+ case TAG_COMPRESSION_LEVEL:
+ ExifData::CompressionLevel = (int)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_THUMBNAIL_OFFSET:
+ ThumbnailOffset = (unsigned)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ case TAG_THUMBNAIL_LENGTH:
+ ThumbnailSize = (unsigned)ConvertAnyFormat(ValuePtr, Format);
+ break;
+
+ }
+
+ if (Tag == TAG_EXIF_OFFSET || Tag == TAG_INTEROP_OFFSET){
+ unsigned char * SubdirStart;
+ SubdirStart = OffsetBase + Get32u(ValuePtr);
+ if (SubdirStart <= OffsetBase || SubdirStart >= OffsetBase+ExifLength){
+ throw FatalError("Illegal subdirectory link");
+ }
+ ProcessExifDir(SubdirStart, OffsetBase, ExifLength, NestingLevel+1);
+ continue;
+ }
+ }
+
+ {
+ // In addition to linking to subdirectories via exif tags,
+ // there's also a potential link to another directory at the end of each
+ // directory. this has got to be the result of a comitee!
+ unsigned char * SubdirStart;
+ unsigned Offset;
+
+ if (DIR_ENTRY_ADDR(DirStart, NumDirEntries) + 4 <= OffsetBase+ExifLength){
+ Offset = Get32u(DIR_ENTRY_ADDR(DirStart, NumDirEntries));
+ // There is at least one jpeg from an HP camera having an Offset of almost MAXUINT.
+ // Adding OffsetBase to it produces an overflow, so compare with ExifLength here.
+ // See http://bugs.kde.org/show_bug.cgi?id=54542
+ if (Offset && Offset < ExifLength){
+ SubdirStart = OffsetBase + Offset;
+ if (SubdirStart > OffsetBase+ExifLength){
+ if (SubdirStart < OffsetBase+ExifLength+20){
+ // Jhead 1.3 or earlier would crop the whole directory!
+ // As Jhead produces this form of format incorrectness,
+ // I'll just let it pass silently
+ kdDebug(7034) << "Thumbnail removed with Jhead 1.3 or earlier\n";
+ }else{
+ throw FatalError("Illegal subdirectory link 2");
+ }
+ }else{
+ if (SubdirStart <= OffsetBase+ExifLength){
+ ProcessExifDir(SubdirStart, OffsetBase, ExifLength, NestingLevel+1);
+ }
+ }
+ }
+ }else{
+ // The exif header ends before the last next directory pointer.
+ }
+ }
+
+ if (ThumbnailSize && ThumbnailOffset){
+ if (ThumbnailSize + ThumbnailOffset < ExifLength){
+ // The thumbnail pointer appears to be valid. Store it.
+ Thumbnail.loadFromData(OffsetBase + ThumbnailOffset, ThumbnailSize, "JPEG");
+ }
+ }
+}
+
+//--------------------------------------------------------------------------
+// Process a COM marker. We want to leave the bytes unchanged. The
+// progam that displays this text may decide to remove blanks, convert
+// newlines, or otherwise modify the text. In particular we want to be
+// safe for passing utf-8 text.
+//--------------------------------------------------------------------------
+void ExifData::process_COM (const uchar * Data, int length)
+{
+ Comment = TQString::fromUtf8((char *)Data+2, (length-2));
+}
+
+
+//--------------------------------------------------------------------------
+// Process a SOFn marker. This is useful for the image dimensions
+//--------------------------------------------------------------------------
+void ExifData::process_SOFn (const uchar * Data, int marker)
+{
+ int data_precision, num_components;
+
+ data_precision = Data[2];
+ ExifData::Height = Get16m(Data+3);
+ ExifData::Width = Get16m(Data+5);
+ num_components = Data[7];
+
+ if (num_components == 3){
+ ExifData::IsColor = 1;
+ }else{
+ ExifData::IsColor = 0;
+ }
+
+ ExifData::Process = marker;
+
+}
+
+//--------------------------------------------------------------------------
+// Get 16 bits motorola order (always) for jpeg header stuff.
+//--------------------------------------------------------------------------
+int ExifData::Get16m(const void * Short)
+{
+ return (((uchar *)Short)[0] << 8) | ((uchar *)Short)[1];
+}
+
+
+//--------------------------------------------------------------------------
+// Process a EXIF marker
+// Describes all the drivel that most digital cameras include...
+//--------------------------------------------------------------------------
+void ExifData::process_EXIF(unsigned char * CharBuf, unsigned int length)
+{
+ ExifData::FlashUsed = 0; // If it s from a digicam, and it used flash, it says so.
+
+ FocalplaneXRes = 0;
+ FocalplaneUnits = 0;
+ ExifImageWidth = 0;
+ ExifImageLength = 0;
+
+ { // Check the EXIF header component
+ static const uchar ExifHeader[] = "Exif\0\0";
+ if (memcmp(CharBuf+2, ExifHeader,6)){
+ throw FatalError("Incorrect Exif header");
+ }
+ }
+
+ if (memcmp(CharBuf+8,"II",2) == 0){
+ // printf("Exif section in Intel order\n");
+ MotorolaOrder = 0;
+ }else{
+ if (memcmp(CharBuf+8,"MM",2) == 0){
+ // printf("Exif section in Motorola order\n");
+ MotorolaOrder = 1;
+ }else{
+ throw FatalError("Invalid Exif alignment marker.");
+ }
+ }
+
+ // Check the next two values for correctness.
+ if (Get16u(CharBuf+10) != 0x2a){
+ throw FatalError("Invalid Exif start (1)");
+ }
+
+ long IFDoffset = Get32u(CharBuf+12);
+
+ LastExifRefd = CharBuf;
+
+ // First directory starts 16 bytes in. Offsets start at 8 bytes in.
+ ProcessExifDir(&CharBuf[8+IFDoffset], CharBuf+8, length-6, 0);
+
+ // This is how far the interesting (non thumbnail) part of the exif went.
+ ExifSettingsLength = LastExifRefd - CharBuf;
+
+ // Compute the CCD width, in milimeters.
+ if (FocalplaneXRes != 0){
+ kdDebug(7034) << "ExifImageWidth " << ExifImageWidth << " FocalplaneUnits " << FocalplaneUnits << " FocalplaneXRes " << FocalplaneXRes << endl;
+ ExifData::CCDWidth = (float)(ExifImageWidth * FocalplaneUnits / FocalplaneXRes);
+ }
+}
+
+//--------------------------------------------------------------------------
+// Convert exif time to Unix time structure
+//--------------------------------------------------------------------------
+int ExifData::Exif2tm(struct tm * timeptr, char * ExifTime)
+{
+ int a;
+
+ timeptr->tm_wday = -1;
+
+ // Check for format: YYYY:MM:DD HH:MM:SS format.
+ a = sscanf(ExifTime, "%d:%d:%d %d:%d:%d",
+ &timeptr->tm_year, &timeptr->tm_mon, &timeptr->tm_mday,
+ &timeptr->tm_hour, &timeptr->tm_min, &timeptr->tm_sec);
+
+ if (a == 6){
+ timeptr->tm_isdst = -1;
+ timeptr->tm_mon -= 1; // Adjust for unix zero-based months
+ timeptr->tm_year -= 1900; // Adjust for year starting at 1900
+ return true; // worked.
+ }
+
+ return false; // Wasn't in Exif date format.
+}
+
+//--------------------------------------------------------------------------
+// Contructor for initialising
+//--------------------------------------------------------------------------
+ExifData::ExifData()
+{
+ ExifData::Whitebalance = -1;
+ ExifData::MeteringMode = -1;
+ ExifData::FlashUsed = 0;
+ Orientation = 0;
+ Height = 0;
+ Width = 0;
+ IsColor = 0;
+ Process = 0;
+ FocalLength = 0;
+ ExposureTime = 0;
+ ApertureFNumber = 0;
+ Distance = 0;
+ CCDWidth = 0;
+ ExposureBias = 0;
+ ExposureProgram = 0;
+ ISOequivalent = 0;
+ CompressionLevel = 0;
+}
+
+//--------------------------------------------------------------------------
+// process a EXIF jpeg file
+//--------------------------------------------------------------------------
+bool ExifData::scan(const TQString & path)
+{
+ int ret;
+
+ TQFile f(path);
+ if ( !f.open(IO_ReadOnly) )
+ return false;
+
+ try {
+ // Scan the JPEG headers.
+ ret = ReadJpegSections(f, READ_EXIF);
+ }
+ catch (FatalError& e) {
+ e.debug_print();
+ f.close();
+ return false;
+ }
+
+ if (ret == false){
+ kdDebug(7034) << "Not JPEG file!\n";
+ DiscardData();
+ f.close();
+ return false;
+ }
+ f.close();
+ DiscardData();
+
+ //now make the strings clean,
+ // for exmaple my Casio is a "QV-4000 "
+ CameraMake = CameraMake.stripWhiteSpace();
+ CameraModel = CameraModel.stripWhiteSpace();
+ UserComment = UserComment.stripWhiteSpace();
+ Comment = Comment.stripWhiteSpace();
+ return true;
+}
+
+//--------------------------------------------------------------------------
+// Does the embedded thumbnail match the jpeg image?
+//--------------------------------------------------------------------------
+#ifndef JPEG_TOL
+#define JPEG_TOL 0.02
+#endif
+bool ExifData::isThumbnailSane() {
+ if (Thumbnail.isNull()) return false;
+
+ // check whether thumbnail dimensions match the image
+ // not foolproof, but catches some altered images (jpegtran -rotate)
+ if (ExifImageLength != 0 && ExifImageLength != Height) return false;
+ if (ExifImageWidth != 0 && ExifImageWidth != Width) return false;
+ if (Thumbnail.width() == 0 || Thumbnail.height() == 0) return false;
+ if (Height == 0 || Width == 0) return false;
+ double d = (double)Height/Width*Thumbnail.width()/Thumbnail.height();
+ return (1-JPEG_TOL < d) && (d < 1+JPEG_TOL);
+}
+
+
+//--------------------------------------------------------------------------
+// return a thumbnail that respects the orientation flag
+// only if it seems sane
+//--------------------------------------------------------------------------
+TQImage ExifData::getThumbnail() {
+ if (!isThumbnailSane()) return NULL;
+ if (!Orientation || Orientation == 1) return Thumbnail;
+
+ // now fix orientation
+ TQWMatrix M;
+ TQWMatrix flip= TQWMatrix(-1,0,0,1,0,0);
+ switch (Orientation) { // notice intentional fallthroughs
+ case 2: M = flip; break;
+ case 4: M = flip;
+ case 3: M.rotate(180); break;
+ case 5: M = flip;
+ case 6: M.rotate(90); break;
+ case 7: M = flip;
+ case 8: M.rotate(270); break;
+ default: break; // should never happen
+ }
+ return Thumbnail.xForm(M);
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-24 03:04:28 +0000