public static string DecodeAsciiString(IBerInput input, int length)
{
var intLength = (int)length;
var bytes = ReadString(input, ref intLength);
return(AsciiEncoding.GetString(bytes, 0, intLength));
}
internal override bool HasTag(Stream stream)
{
stream.Seek(0, SeekOrigin.Begin);
var headerBytes = new byte[5];
stream.Read(headerBytes, 0, 5);
string magic = AsciiEncoding.GetString(headerBytes, 0, 3);
return(magic == "ID3" && headerBytes[3] == 3);
}
/// <summary>
/// Returns an ASCII string converted from the given byte array.
/// </summary>
public static string ToAscii(byte[] data, bool endatfirstnull)
{
int len = data.Length;
if (endatfirstnull)
{
len = Array.IndexOf(data, (byte)0);
if (len == -1)
{
len = data.Length;
}
}
var encoding = new AsciiEncoding();
return(encoding.GetString(data, 0, len));
//return Encoding.ASCII.GetString(data, 0, len);
}
/// <summary>
/// Reads an ASCII encoded string.
/// </summary>
/// <param name="length">number of bytes to read</param>
/// <returns>The value as a string</returns>
public string ReadAsciiString(int length)
{
if (length == 0)
{
return(string.Empty);
}
Guard.MustBeGreaterThan(length, 0, nameof(length));
string value = AsciiEncoding.GetString(this.data, this.AddIndex(length), length);
// remove data after (potential) null terminator
int pos = value.IndexOf('\0');
if (pos >= 0)
{
value = value.Substring(0, pos);
}
return(value);
}
internal override Id3Tag ReadTag(Stream stream)
{
if (!HasTag(stream))
{
return(null);
}
var tag = new Id3Tag {
MajorVersion = 2,
MinorVersion = 3,
Family = Id3TagFamily.Version2x,
IsSupported = true,
};
stream.Seek(4, SeekOrigin.Begin);
var headerBytes = new byte[6];
stream.Read(headerBytes, 0, 6);
var headerContainer = new Id3v2Header();
tag.AdditionalData = headerContainer;
byte flags = headerBytes[1];
var header = new Id3v2StandardHeader {
Revision = headerBytes[0],
Unsyncronization = (flags & 0x80) > 0,
ExtendedHeader = (flags & 0x40) > 0,
Experimental = (flags & 0x20) > 0
};
headerContainer.Header = header;
int tagSize = SyncSafeNumber.DecodeSafe(headerBytes, 2, 4);
var tagData = new byte[tagSize];
stream.Read(tagData, 0, tagSize);
int currentPos = 0;
if (header.ExtendedHeader)
{
SyncSafeNumber.DecodeSafe(tagData, currentPos, 4);
currentPos += 4;
var extendedHeader = new Id3v2ExtendedHeader {
PaddingSize = SyncSafeNumber.DecodeNormal(tagData, currentPos + 2, 4)
};
if ((tagData[currentPos] & 0x80) > 0)
{
extendedHeader.Crc32 = SyncSafeNumber.DecodeNormal(tagData, currentPos + 6, 4);
currentPos += 10;
}
else
{
currentPos += 6;
}
headerContainer.ExtendedHeader = extendedHeader;
}
while (currentPos < tagSize && tagData[currentPos] != 0x00)
{
string frameId = AsciiEncoding.GetString(tagData, currentPos, 4);
currentPos += 4;
int frameSize = SyncSafeNumber.DecodeNormal(tagData, currentPos, 4);
currentPos += 4;
var frameFlags = (ushort)((tagData[currentPos] << 0x08) + tagData[currentPos + 1]);
currentPos += 2;
var frameData = new byte[frameSize];
Array.Copy(tagData, currentPos, frameData, 0, frameSize);
FrameHandler mapping = FrameHandlers[frameId];
if (mapping != null && mapping.Decoder != null)
{
Id3Frame frame = mapping.Decoder(frameData);
tag.Frames.Add(frame);
}
currentPos += frameSize;
}
return(tag);
}
/// <summary>
/// Creates an ExifProperty from the given interoperability parameters.
/// </summary>
/// <param name="tag">The tag id of the exif property.</param>
/// <param name="type">The type id of the exif property.</param>
/// <param name="count">Byte or component count.</param>
/// <param name="value">Field data as an array of bytes.</param>
/// <param name="byteOrder">Byte order of value.</param>
/// <param name="ifd">IFD section containing this propery.</param>
/// <returns>an ExifProperty initialized from the interoperability parameters.</returns>
public static ExifProperty Get(ushort tag, ushort type, uint count, byte[] value, BitConverterEx.ByteOrder byteOrder, IFD ifd)
{
BitConverterEx conv = new BitConverterEx(byteOrder, BitConverterEx.ByteOrder.System);
if (ifd == IFD.Zeroth)
{
if (tag == 0x103) // Compression
{
return(new ExifEnumProperty <Compression>(ExifTag.Compression, (Compression)conv.ToUInt16(value, 0)));
}
else if (tag == 0x106) // PhotometricInterpretation
{
return(new ExifEnumProperty <PhotometricInterpretation>(ExifTag.PhotometricInterpretation, (PhotometricInterpretation)conv.ToUInt16(value, 0)));
}
else if (tag == 0x112) // Orientation
{
return(new ExifEnumProperty <Orientation>(ExifTag.Orientation, (Orientation)conv.ToUInt16(value, 0)));
}
else if (tag == 0x11c) // PlanarConfiguration
{
return(new ExifEnumProperty <PlanarConfiguration>(ExifTag.PlanarConfiguration, (PlanarConfiguration)conv.ToUInt16(value, 0)));
}
else if (tag == 0x213) // YCbCrPositioning
{
return(new ExifEnumProperty <YCbCrPositioning>(ExifTag.YCbCrPositioning, (YCbCrPositioning)conv.ToUInt16(value, 0)));
}
else if (tag == 0x128) // ResolutionUnit
{
return(new ExifEnumProperty <ResolutionUnit>(ExifTag.ResolutionUnit, (ResolutionUnit)conv.ToUInt16(value, 0)));
}
else if (tag == 0x132) // DateTime
{
return(new ExifDateTime(ExifTag.DateTime, ExifBitConverter.ToDateTime(value)));
}
}
else if (ifd == IFD.EXIF)
{
if (tag == 0x9000) // ExifVersion
{
return(new ExifVersion(ExifTag.ExifVersion, ExifBitConverter.ToAscii(value)));
}
else if (tag == 0xa000) // FlashpixVersion
{
return(new ExifVersion(ExifTag.FlashpixVersion, ExifBitConverter.ToAscii(value)));
}
else if (tag == 0xa001) // ColorSpace
{
return(new ExifEnumProperty <ColorSpace>(ExifTag.ColorSpace, (ColorSpace)conv.ToUInt16(value, 0)));
}
else if (tag == 0x9286) // UserComment
{
byte[] encbytes = new byte[8];
byte[] strbytes = new byte[value.Length - 8];
Array.Copy(value, encbytes, 8);
Array.Copy(value, 8, strbytes, 0, value.Length - 8);
Encoding enc = new AsciiEncoding();
string encstr = enc.GetString(encbytes, 0, encbytes.Length);
if (encstr == "ASCII\0\0\0")
{
enc = new AsciiEncoding();
}
else if (encstr == "JIS\0\0\0\0\0")
{
enc = Encoding.GetEncoding("Japanese (JIS 0208-1990 and 0212-1990)");
}
else if (encstr == "Unicode\0")
{
enc = Encoding.Unicode;
}
else
{
enc = null;
}
int len = Array.IndexOf(strbytes, (byte)0);
if (len == -1)
{
len = strbytes.Length;
}
return(new ExifEncodedString(ExifTag.UserComment, (enc == null ? new AsciiEncoding().GetString(strbytes, 0, len) : enc.GetString(strbytes, 0, len)), enc));
}
else if (tag == 0x9003) // DateTimeOriginal
{
return(new ExifDateTime(ExifTag.DateTimeOriginal, ExifBitConverter.ToDateTime(value)));
}
else if (tag == 0x9004) // DateTimeDigitized
{
return(new ExifDateTime(ExifTag.DateTimeDigitized, ExifBitConverter.ToDateTime(value)));
}
else if (tag == 0x8822) // ExposureProgram
{
return(new ExifEnumProperty <ExposureProgram>(ExifTag.ExposureProgram, (ExposureProgram)conv.ToUInt16(value, 0)));
}
else if (tag == 0x9207) // MeteringMode
{
return(new ExifEnumProperty <MeteringMode>(ExifTag.MeteringMode, (MeteringMode)conv.ToUInt16(value, 0)));
}
else if (tag == 0x9208) // LightSource
{
return(new ExifEnumProperty <LightSource>(ExifTag.LightSource, (LightSource)conv.ToUInt16(value, 0)));
}
else if (tag == 0x9209) // Flash
{
return(new ExifEnumProperty <Flash>(ExifTag.Flash, (Flash)conv.ToUInt16(value, 0), true));
}
else if (tag == 0x9214) // SubjectArea
{
if (count == 3)
{
return(new ExifCircularSubjectArea(ExifTag.SubjectArea, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder)));
}
else if (count == 4)
{
return(new ExifRectangularSubjectArea(ExifTag.SubjectArea, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder)));
}
else // count == 2
{
return(new ExifPointSubjectArea(ExifTag.SubjectArea, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder)));
}
}
else if (tag == 0xa210) // FocalPlaneResolutionUnit
{
return(new ExifEnumProperty <ResolutionUnit>(ExifTag.FocalPlaneResolutionUnit, (ResolutionUnit)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa214) // SubjectLocation
{
return(new ExifPointSubjectArea(ExifTag.SubjectLocation, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder)));
}
else if (tag == 0xa217) // SensingMethod
{
return(new ExifEnumProperty <SensingMethod>(ExifTag.SensingMethod, (SensingMethod)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa300) // FileSource
{
return(new ExifEnumProperty <FileSource>(ExifTag.FileSource, (FileSource)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa301) // SceneType
{
return(new ExifEnumProperty <SceneType>(ExifTag.SceneType, (SceneType)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa401) // CustomRendered
{
return(new ExifEnumProperty <CustomRendered>(ExifTag.CustomRendered, (CustomRendered)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa402) // ExposureMode
{
return(new ExifEnumProperty <ExposureMode>(ExifTag.ExposureMode, (ExposureMode)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa403) // WhiteBalance
{
return(new ExifEnumProperty <WhiteBalance>(ExifTag.WhiteBalance, (WhiteBalance)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa406) // SceneCaptureType
{
return(new ExifEnumProperty <SceneCaptureType>(ExifTag.SceneCaptureType, (SceneCaptureType)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa407) // GainControl
{
return(new ExifEnumProperty <GainControl>(ExifTag.GainControl, (GainControl)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa408) // Contrast
{
return(new ExifEnumProperty <Contrast>(ExifTag.Contrast, (Contrast)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa409) // Saturation
{
return(new ExifEnumProperty <Saturation>(ExifTag.Saturation, (Saturation)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa40a) // Sharpness
{
return(new ExifEnumProperty <Sharpness>(ExifTag.Sharpness, (Sharpness)conv.ToUInt16(value, 0), true));
}
else if (tag == 0xa40c) // SubjectDistanceRange
{
return(new ExifEnumProperty <SubjectDistanceRange>(ExifTag.SubjectDistance, (SubjectDistanceRange)conv.ToUInt16(value, 0), true));
}
}
else if (ifd == IFD.GPS)
{
if (tag == 0) // GPSVersionID
{
return(new ExifVersion(ExifTag.GPSVersionID, ExifBitConverter.ToString(value)));
}
else if (tag == 1) // GPSLatitudeRef
{
return(new ExifEnumProperty <GPSLatitudeRef>(ExifTag.GPSLatitudeRef, (GPSLatitudeRef)value[0]));
}
else if (tag == 2) // GPSLatitude
{
return(new GPSLatitudeLongitude(ExifTag.GPSLatitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder)));
}
else if (tag == 3) // GPSLongitudeRef
{
return(new ExifEnumProperty <GPSLongitudeRef>(ExifTag.GPSLongitudeRef, (GPSLongitudeRef)value[0]));
}
else if (tag == 4) // GPSLongitude
{
return(new GPSLatitudeLongitude(ExifTag.GPSLongitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder)));
}
else if (tag == 5) // GPSAltitudeRef
{
return(new ExifEnumProperty <GPSAltitudeRef>(ExifTag.GPSAltitudeRef, (GPSAltitudeRef)value[0]));
}
else if (tag == 7) // GPSTimeStamp
{
return(new GPSTimeStamp(ExifTag.GPSTimeStamp, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder)));
}
else if (tag == 9) // GPSStatus
{
return(new ExifEnumProperty <GPSStatus>(ExifTag.GPSStatus, (GPSStatus)value[0]));
}
else if (tag == 10) // GPSMeasureMode
{
return(new ExifEnumProperty <GPSMeasureMode>(ExifTag.GPSMeasureMode, (GPSMeasureMode)value[0]));
}
else if (tag == 12) // GPSSpeedRef
{
return(new ExifEnumProperty <GPSSpeedRef>(ExifTag.GPSSpeedRef, (GPSSpeedRef)value[0]));
}
else if (tag == 14) // GPSTrackRef
{
return(new ExifEnumProperty <GPSDirectionRef>(ExifTag.GPSTrackRef, (GPSDirectionRef)value[0]));
}
else if (tag == 16) // GPSImgDirectionRef
{
return(new ExifEnumProperty <GPSDirectionRef>(ExifTag.GPSImgDirectionRef, (GPSDirectionRef)value[0]));
}
else if (tag == 19) // GPSDestLatitudeRef
{
return(new ExifEnumProperty <GPSLatitudeRef>(ExifTag.GPSDestLatitudeRef, (GPSLatitudeRef)value[0]));
}
else if (tag == 20) // GPSDestLatitude
{
return(new GPSLatitudeLongitude(ExifTag.GPSDestLatitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder)));
}
else if (tag == 21) // GPSDestLongitudeRef
{
return(new ExifEnumProperty <GPSLongitudeRef>(ExifTag.GPSDestLongitudeRef, (GPSLongitudeRef)value[0]));
}
else if (tag == 22) // GPSDestLongitude
{
return(new GPSLatitudeLongitude(ExifTag.GPSDestLongitude, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder)));
}
else if (tag == 23) // GPSDestBearingRef
{
return(new ExifEnumProperty <GPSDirectionRef>(ExifTag.GPSDestBearingRef, (GPSDirectionRef)value[0]));
}
else if (tag == 25) // GPSDestDistanceRef
{
return(new ExifEnumProperty <GPSDistanceRef>(ExifTag.GPSDestDistanceRef, (GPSDistanceRef)value[0]));
}
else if (tag == 29) // GPSDate
{
return(new ExifDateTime(ExifTag.GPSDateStamp, ExifBitConverter.ToDateTime(value, false)));
}
else if (tag == 30) // GPSDifferential
{
return(new ExifEnumProperty <GPSDifferential>(ExifTag.GPSDifferential, (GPSDifferential)conv.ToUInt16(value, 0)));
}
}
else if (ifd == IFD.Interop)
{
if (tag == 1) // InteroperabilityIndex
{
return(new ExifAscii(ExifTag.InteroperabilityIndex, ExifBitConverter.ToAscii(value)));
}
else if (tag == 2) // InteroperabilityVersion
{
return(new ExifVersion(ExifTag.InteroperabilityVersion, ExifBitConverter.ToAscii(value)));
}
}
else if (ifd == IFD.First)
{
if (tag == 0x103) // Compression
{
return(new ExifEnumProperty <Compression>(ExifTag.ThumbnailCompression, (Compression)conv.ToUInt16(value, 0)));
}
else if (tag == 0x106) // PhotometricInterpretation
{
return(new ExifEnumProperty <PhotometricInterpretation>(ExifTag.ThumbnailPhotometricInterpretation, (PhotometricInterpretation)conv.ToUInt16(value, 0)));
}
else if (tag == 0x112) // Orientation
{
return(new ExifEnumProperty <Orientation>(ExifTag.ThumbnailOrientation, (Orientation)conv.ToUInt16(value, 0)));
}
else if (tag == 0x11c) // PlanarConfiguration
{
return(new ExifEnumProperty <PlanarConfiguration>(ExifTag.ThumbnailPlanarConfiguration, (PlanarConfiguration)conv.ToUInt16(value, 0)));
}
else if (tag == 0x213) // YCbCrPositioning
{
return(new ExifEnumProperty <YCbCrPositioning>(ExifTag.ThumbnailYCbCrPositioning, (YCbCrPositioning)conv.ToUInt16(value, 0)));
}
else if (tag == 0x128) // ResolutionUnit
{
return(new ExifEnumProperty <ResolutionUnit>(ExifTag.ThumbnailResolutionUnit, (ResolutionUnit)conv.ToUInt16(value, 0)));
}
else if (tag == 0x132) // DateTime
{
return(new ExifDateTime(ExifTag.ThumbnailDateTime, ExifBitConverter.ToDateTime(value)));
}
}
// Find the exif tag corresponding to given tag id
ExifTag etag = ExifTagFactory.GetExifTag(ifd, tag);
if (type == 1) // 1 = BYTE An 8-bit unsigned integer.
{
if (count == 1)
{
return(new ExifByte(etag, value[0]));
}
else
{
return(new ExifByteArray(etag, value));
}
}
else if (type == 2) // 2 = ASCII An 8-bit byte containing one 7-bit ASCII code.
{
return(new ExifAscii(etag, ExifBitConverter.ToAscii(value)));
}
else if (type == 3) // 3 = SHORT A 16-bit (2-byte) unsigned integer.
{
if (count == 1)
{
return(new ExifUShort(etag, conv.ToUInt16(value, 0)));
}
else
{
return(new ExifUShortArray(etag, ExifBitConverter.ToUShortArray(value, (int)count, byteOrder)));
}
}
else if (type == 4) // 4 = LONG A 32-bit (4-byte) unsigned integer.
{
if (count == 1)
{
return(new ExifUInt(etag, conv.ToUInt32(value, 0)));
}
else
{
return(new ExifUIntArray(etag, ExifBitConverter.ToUIntArray(value, (int)count, byteOrder)));
}
}
else if (type == 5) // 5 = RATIONAL Two LONGs. The first LONG is the numerator and the second LONG expresses the denominator.
{
if (count == 1)
{
return(new ExifURational(etag, ExifBitConverter.ToURational(value, byteOrder)));
}
else
{
return(new ExifURationalArray(etag, ExifBitConverter.ToURationalArray(value, (int)count, byteOrder)));
}
}
else if (type == 7) // 7 = UNDEFINED An 8-bit byte that can take any value depending on the field definition.
{
return(new ExifUndefined(etag, value));
}
else if (type == 9) // 9 = SLONG A 32-bit (4-byte) signed integer (2's complement notation).
{
if (count == 1)
{
return(new ExifSInt(etag, conv.ToInt32(value, 0)));
}
else
{
return(new ExifSIntArray(etag, ExifBitConverter.ToSIntArray(value, (int)count, byteOrder)));
}
}
else if (type == 10) // 10 = SRATIONAL Two SLONGs. The first SLONG is the numerator and the second SLONG is the denominator.
{
if (count == 1)
{
return(new ExifSRational(etag, ExifBitConverter.ToSRational(value, byteOrder)));
}
else
{
return(new ExifSRationalArray(etag, ExifBitConverter.ToSRationalArray(value, (int)count, byteOrder)));
}
}
else
{
throw new ArgumentException("Unknown property type.");
}
}