public static bool CanTranscodeDataset()

in src/Microsoft.Health.Dicom.Core/Features/Retrieve/DicomDatasetExtensions.cs [37:121]
74 lines of code
51 McCabe index (conditional complexity)

        public static bool CanTranscodeDataset(this DicomDataset ds, DicomTransferSyntax toTransferSyntax)
        {
            EnsureArg.IsNotNull(ds, nameof(ds));

            if (toTransferSyntax == null)
            {
                return true;
            }

            var fromTs = ds.InternalTransferSyntax;
            if (!ds.TryGetSingleValue(DicomTag.BitsAllocated, out ushort bpp))
            {
                return false;
            }

            if (!ds.TryGetString(DicomTag.PhotometricInterpretation, out string photometricInterpretation))
            {
                return false;
            }

            if ((fromTs == DicomTransferSyntax.JPEG2000Lossless || fromTs == DicomTransferSyntax.JPEG2000Lossy) &&
                (toTransferSyntax == DicomTransferSyntax.JPEG2000Lossless || toTransferSyntax == DicomTransferSyntax.JPEG2000Lossy) &&
                ((photometricInterpretation == PhotometricInterpretation.YbrIct.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrRct.Value)))
            {
                return false;
            }

            if ((fromTs == DicomTransferSyntax.DeflatedExplicitVRLittleEndian ||
                fromTs == DicomTransferSyntax.ExplicitVRBigEndian ||
                fromTs == DicomTransferSyntax.ExplicitVRLittleEndian ||
                fromTs == DicomTransferSyntax.ImplicitVRLittleEndian ||
                fromTs == DicomTransferSyntax.RLELossless) &&
                (toTransferSyntax == DicomTransferSyntax.JPEG2000Lossless ||
                toTransferSyntax == DicomTransferSyntax.JPEG2000Lossy ||
                toTransferSyntax == DicomTransferSyntax.JPEGProcess1 ||
                toTransferSyntax == DicomTransferSyntax.JPEGProcess2_4) &&
                ((photometricInterpretation == PhotometricInterpretation.Rgb.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrFull422.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrPartial422.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrPartial420.Value)))
            {
                return false;
            }

            if ((fromTs == DicomTransferSyntax.JPEG2000Lossless || fromTs == DicomTransferSyntax.JPEG2000Lossy) &&
                ((photometricInterpretation == PhotometricInterpretation.Rgb.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrFull422.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrPartial422.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrPartial420.Value)))
            {
                return false;
            }

            if ((fromTs == DicomTransferSyntax.JPEGProcess1 || fromTs == DicomTransferSyntax.JPEGProcess2_4) &&
                ((photometricInterpretation == PhotometricInterpretation.Rgb.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrFull.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrFull422.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrPartial422.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrPartial420.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrIct.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrRct.Value)))
            {
                return false;
            }

            // Bug in fo-dicom 4.0.1
            if ((toTransferSyntax == DicomTransferSyntax.JPEGProcess1 || toTransferSyntax == DicomTransferSyntax.JPEGProcess2_4) &&
                ((photometricInterpretation == PhotometricInterpretation.Monochrome1.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.Monochrome2.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrFull.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrIct.Value) ||
                 (photometricInterpretation == PhotometricInterpretation.YbrRct.Value)))
            {
                return false;
            }

            if (((bpp > 8) && SupportedTransferSyntaxesOver8Bit.Contains(toTransferSyntax) && SupportedTransferSyntaxesOver8Bit.Contains(fromTs)) ||
                ((bpp <= 8) && SupportedTransferSyntaxes8Bit.Contains(toTransferSyntax) && SupportedTransferSyntaxes8Bit.Contains(fromTs)))
            {
                return true;
            }

            return false;
        }