kCGImagePropertyRawDictionary

main.m

#import <Foundation/Foundation.h>
#import <ImageIO/ImageIO.h>

CGImageSourceRef createSourceFromPath(NSString *path) {
    NSFileManager *f = [[NSFileManager alloc] init];
    NSString *inImagePath = [NSString pathWithComponents:@[f.currentDirectoryPath, path]];
    CGDataProviderRef provider = CGDataProviderCreateWithFilename([inImagePath cStringUsingEncoding:NSUTF8StringEncoding]);
    CGImageSourceRef src = CGImageSourceCreateWithDataProvider(provider, NULL);
    CGDataProviderRelease(provider);
    return src;
}

void showImageStuff(CGImageSourceRef source) {
    CFStringRef sourceUTI = CGImageSourceGetType(source);
    CFDictionaryRef sourceProps = CGImageSourceCopyProperties(source, NULL);
    CFDictionaryRef imgProps = CGImageSourceCopyPropertiesAtIndex(source, 0, NULL);

    CFShow(sourceUTI);
    CFShow(sourceProps);
    CFShow(imgProps);

    CFRelease(sourceProps);
    CFRelease(imgProps);
}

CFDictionaryRef CreateInsaneExifDict();

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        NSFileManager *f = [[NSFileManager alloc] init];
        NSString *outImagePath = [NSString pathWithComponents:@[f.currentDirectoryPath, @"out_img.jpg"]];

        CGImageSourceRef source = createSourceFromPath(@"img.jpg");

        showImageStuff(source);
        size_t numImages = CGImageSourceGetCount(source);
        CGImageRef image = CGImageSourceCreateImageAtIndex(source, 0, NULL);

        CFMutableDataRef outData = CFDataCreateMutable(NULL, 0);
        CGImageDestinationRef dest = CGImageDestinationCreateWithData(outData, CGImageSourceGetType(source), numImages, NULL);
        CFStringRef keys[3];
        CFTypeRef vals[3];
        keys[0] = kCGImagePropertyRawDictionary;
        vals[0] = CreateInsaneExifDict();
        CFDictionaryRef newProps = CFDictionaryCreate(NULL, (const void **)keys, (const void **)vals, 1, &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
        CGImageDestinationAddImage(dest, image, newProps);
        CGImageDestinationFinalize(dest);
        CFRelease(dest);

        NSMutableData *nsData = CFBridgingRelease(outData);
        [nsData writeToFile:outImagePath atomically:NO];

        CGImageRelease(image);
        CFRelease(source);

        CGImageSourceRef outSource = createSourceFromPath(@"out_img.jpg");

        showImageStuff(outSource);

        CFRelease(outSource);

    }
    return 0;
}


CFDictionaryRef CreateInsaneExifDict() {
    CFStringRef keys[] = {
        CFSTR("{Raw}"),
        CFSTR("{CIFF}"),
        CFSTR("{MakerCanon}"),
        CFSTR("{MakerNikon}"),
        CFSTR("{MakerMinolta}"),
        CFSTR("{MakerFuji}"),
        CFSTR("{MakerOlympus}"),
        CFSTR("{MakerPentax}"),
        CFSTR("{8BIM}"),
        CFSTR("{DNG}"),
        CFSTR("{ExifAux}"),
        CFSTR("{MakerApple}"),
        CFSTR("{EXR}"),
        CFSTR("FileSize"),
        CFSTR("DPIHeight"),
        CFSTR("DPIWidth"),
        CFSTR("PixelHeight"),
        CFSTR("PixelWidth"),
        CFSTR("Depth"),
        CFSTR("SamplesPerPixel"),
        CFSTR("BitsPerPixel"),
        CFSTR("IsFloat"),
        CFSTR("IsIndexed"),
        CFSTR("HasAlpha"),
        CFSTR("ColorModel"),
        CFSTR("ProfileName"),
        CFSTR("Gray"),
        CFSTR("CMYK"),
        CFSTR("DocumentName"),
        CFSTR("DateTime"),
        CFSTR("Artist"),
        CFSTR("HostComputer"),
        CFSTR("JFIFVersion"),
        CFSTR("XDensity"),
        CFSTR("YDensity"),
        CFSTR("DensityUnit"),
        CFSTR("IsProgressive"),
        CFSTR("SensitivityType"),
        CFSTR("StandardOutputSensitivity"),
        CFSTR("RecommendedExposureIndex"),
        CFSTR("ISOSpeed"),
        CFSTR("ISOSpeedLatitudeyyy"),
        CFSTR("ISOSpeedLatitudezzz"),
        CFSTR("CameraOwnerName"),
        CFSTR("BodySerialNumber"),
        CFSTR("LensSpecification"),
        CFSTR("LensMake"),
        CFSTR("LensModel"),
        CFSTR("WidthAppliedTo"),
        CFSTR("HeightAppliedTo"),
        CFSTR("RegionList"),
        CFSTR("Width"),
        CFSTR("Height"),
        CFSTR("Name"),
        CFSTR("Type"),
        CFSTR("Face"),
        CFSTR("Focus"),
        CFSTR("BarCode"),
        CFSTR("Timestamp"),
        CFSTR("AngleInfoYaw"),
        CFSTR("AngleInfoRoll"),
        CFSTR("ConfidenceLevel"),
        CFSTR("FaceID"),
        CFSTR("Quantization"),
        CFSTR("ChromaSubsamplingX"),
        CFSTR("ChromaSubsamplingY"),
        CFSTR("LoopCount"),
        CFSTR("DelayTime"),
        CFSTR("ImageColorMap"),
        CFSTR("HasGlobalColorMap"),
        CFSTR("UnclampedDelayTime"),
        CFSTR("InterlaceType"),
        CFSTR("XPixelsPerMeter"),
        CFSTR("YPixelsPerMeter"),
        CFSTR("sRGBIntent"),
        CFSTR("Chromaticities"),
        CFSTR("Creation Time"),
        CFSTR("GPSVersion"),
        CFSTR("LatitudeRef"),
        CFSTR("Latitude"),
        CFSTR("LongitudeRef"),
        CFSTR("Longitude"),
        CFSTR("AltitudeRef"),
        CFSTR("Altitude"),
        CFSTR("TimeStamp"),
        CFSTR("Satellites"),
        CFSTR("Status"),
        CFSTR("MeasureMode"),
        CFSTR("SpeedRef"),
        CFSTR("Speed"),
        CFSTR("TrackRef"),
        CFSTR("Track"),
        CFSTR("ImgDirectionRef"),
        CFSTR("ImgDirection"),
        CFSTR("MapDatum"),
        CFSTR("DestLatitudeRef"),
        CFSTR("DestLatitude"),
        CFSTR("DestLongitudeRef"),
        CFSTR("DestLongitude"),
        CFSTR("DestBearingRef"),
        CFSTR("DestBearing"),
        CFSTR("DestDistanceRef"),
        CFSTR("DestDistance"),
        CFSTR("ProcessingMethod"),
        CFSTR("AreaInformation"),
        CFSTR("DateStamp"),
        CFSTR("Differential"),
        CFSTR("HPositioningError"),
        CFSTR("ObjectTypeReference"),
        CFSTR("ObjectAttributeReference"),
        CFSTR("ObjectName"),
        CFSTR("EditStatus"),
        CFSTR("EditorialUpdate"),
        CFSTR("SubjectReference"),
        CFSTR("SupplementalCategory"),
        CFSTR("FixtureIdentifier"),
        CFSTR("Keywords"),
        CFSTR("ContentLocationCode"),
        CFSTR("ContentLocationName"),
        CFSTR("ReleaseDate"),
        CFSTR("ReleaseTime"),
        CFSTR("ExpirationDate"),
        CFSTR("ExpirationTime"),
        CFSTR("SpecialInstructions"),
        CFSTR("ActionAdvised"),
        CFSTR("ReferenceService"),
        CFSTR("ReferenceDate"),
        CFSTR("ReferenceNumber"),
        CFSTR("TimeCreated"),
        CFSTR("DigitalCreationDate"),
        CFSTR("DigitalCreationTime"),
        CFSTR("OriginatingProgram"),
        CFSTR("ProgramVersion"),
        CFSTR("ObjectCycle"),
        CFSTR("Byline"),
        CFSTR("BylineTitle"),
        CFSTR("SubLocation"),
        CFSTR("Province/State"),
        CFSTR("Country/PrimaryLocationCode"),
        CFSTR("Country/PrimaryLocationName"),
        CFSTR("OriginalTransmissionReference"),
        CFSTR("CopyrightNotice"),
        CFSTR("Caption/Abstract"),
        CFSTR("Writer/Editor"),
        CFSTR("ImageType"),
        CFSTR("ImageOrientation"),
        CFSTR("LanguageIdentifier"),
        CFSTR("StarRating"),
        CFSTR("CiAdrCity"),
        CFSTR("CiAdrCtry"),
        CFSTR("CiAdrExtadr"),
        CFSTR("CiAdrPcode"),
        CFSTR("CiAdrRegion"),
        CFSTR("CiEmailWork"),
        CFSTR("CiTelWork"),
        CFSTR("CiUrlWork"),
        CFSTR("LayerNames"),
        CFSTR("Version"),
        CFSTR("DNGVersion"),
        CFSTR("DNGBackwardVersion"),
        CFSTR("UniqueCameraModel"),
        CFSTR("LocalizedCameraModel"),
        CFSTR("CameraSerialNumber"),
        CFSTR("BlackLevel"),
        CFSTR("WhiteLevel"),
        CFSTR("CalibrationIlluminant1"),
        CFSTR("CalibrationIlluminant2"),
        CFSTR("ColorMatrix1"),
        CFSTR("ColorMatrix2"),
        CFSTR("CameraCalibration1"),
        CFSTR("CameraCalibration2"),
        CFSTR("AsShotNeutral"),
        CFSTR("AsShotWhiteXY"),
        CFSTR("BaselineExposure"),
        CFSTR("BaselineNoise"),
        CFSTR("BaselineSharpness"),
        CFSTR("DNGPrivateData"),
        CFSTR("CameraCalibrationSignature"),
        CFSTR("ProfileCalibrationSignature"),
        CFSTR("NoiseProfile"),
        CFSTR("WarpRectilinear"),
        CFSTR("WarpFisheye"),
        CFSTR("FixVignetteRadial"),
        CFSTR("ImageName"),
        CFSTR("ImageFileName"),
        CFSTR("ReleaseMethod"),
        CFSTR("ReleaseTiming"),
        CFSTR("RecordID"),
        CFSTR("SelfTimingTime"),
        CFSTR("ImageSerialNumber"),
        CFSTR("ContinuousDrive"),
        CFSTR("FocusMode"),
        CFSTR("ShootingMode"),
        CFSTR("LensMaxMM"),
        CFSTR("LensMinMM"),
        CFSTR("WhiteBalanceIndex"),
        CFSTR("FlashExposureComp"),
        CFSTR("MeasuredEV"),
        CFSTR("ISOSetting"),
        CFSTR("ColorMode"),
        CFSTR("Quality"),
        CFSTR("WhiteBalanceMode"),
        CFSTR("SharpenMode"),
        CFSTR("FlashSetting"),
        CFSTR("ISOSelection"),
        CFSTR("ImageAdjustment"),
        CFSTR("LensAdapter"),
        CFSTR("LensType"),
        CFSTR("FocusDistance"),
        CFSTR("DigitalZoom"),
        CFSTR("ShutterCount"),
        CFSTR("AspectRatioInfo"),
        CFSTR("ThumbnailOffset"),
        CFSTR("ThumbnailSize"),
        CFSTR("ThumbnailWidth"),
        CFSTR("ThumbnailHeight"),
        CFSTR("AspectRatio"),
    };
    size_t numEntries = sizeof(keys) / sizeof(keys[0]);
    CFStringRef vals[numEntries];
    for (NSInteger i = 0; i < numEntries; i++) {
        vals[i] = CFSTR("TESTVALUE");
    }
    return CFDictionaryCreate(NULL, (const void **)keys, (const void **)vals, numEntries, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
}