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-rw-r--r--kfile-plugins/jpeg/exif.cpp961
1 files changed, 0 insertions, 961 deletions
diff --git a/kfile-plugins/jpeg/exif.cpp b/kfile-plugins/jpeg/exif.cpp
deleted file mode 100644
index 60c689bd..00000000
--- a/kfile-plugins/jpeg/exif.cpp
+++ /dev/null
@@ -1,961 +0,0 @@
-//--------------------------------------------------------------------------
-// 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);
-}
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