public static byte[] ConvertData(Type dataType, ExifType targetType, object value)
{
switch (targetType)
{
case ExifType.Ascii:
{
return(Encoding.ASCII.GetBytes(Convert.ToString(value) + '\0'));
}
case ExifType.Byte:
case ExifType.Raw:
{
if (dataType == typeof(UnicodeEncoding))
{
return(Encoding.Unicode.GetBytes(Convert.ToString(value) + '\0'));
}
return(ExifEncoder.WriteBytes(value));
}
case ExifType.Int32:
{
return(ExifEncoder.WriteInt32(value));
}
case ExifType.Rational:
{
return(ExifEncoder.WriteRational(value));
}
case ExifType.UInt16:
{
return(ExifEncoder.WriteUInt16(value));
}
case ExifType.UInt32:
{
return(ExifEncoder.WriteUInt32(value));
}
case ExifType.URational:
{
return(ExifEncoder.WriteURational(value));
}
default:
{
throw new NotImplementedException(String.Format("Encoding for EXIF type \"{0}\" has not yet been implemented.", targetType));
}
}
}
public static object ConvertTo(this byte[] bytes, ExifType type, int len)
{
switch (type)
{
case ExifType.Byte:
return(bytes);
case ExifType.String:
return(Encoding.ASCII.GetString(bytes));
case ExifType.UInt16:
return(BitConverter.ToUInt16(bytes.Safe(2), 0));
case ExifType.UInt32:
return(BitConverter.ToUInt32(bytes.Safe(4), 0));
case ExifType.URational:
if (len > 8)
{
return(URationalArray(bytes, len));
}
else
{
return(URationalFromBytes(bytes, 0));
}
case ExifType.Object:
return(bytes);
case ExifType.Int32:
return(BitConverter.ToInt32(bytes.Safe(4), 0));
case ExifType.Long:
return(BitConverter.ToInt64(bytes.Safe(8), 0));
case ExifType.Rational:
if (len > 8)
{
return(RationalArray(bytes, len));
}
else
{
return(RationalFromBytes(bytes, 0));
}
default:
return(bytes);
}
}
public static object ConvertTo(this byte[] bytes, ExifType type, int len)
{
switch (type)
{
case ExifType.Byte:
return(bytes);
case ExifType.String:
return(Encoding.ASCII.GetString(bytes));
case ExifType.UInt16:
return(BitConverter.ToUInt16(bytes.Safe(2), 0));
case ExifType.UInt32:
return(BitConverter.ToUInt32(bytes.Safe(4), 0));
case ExifType.URational:
return(new URational
{
Denominator = BitConverter.ToUInt32(bytes, 4),
Numerator = BitConverter.ToUInt32(bytes, 0)
});
case ExifType.Object:
return(bytes);
case ExifType.Int32:
return(BitConverter.ToInt32(bytes.Safe(4), 0));
case ExifType.Long:
return(BitConverter.ToInt64(bytes.Safe(8), 0));
case ExifType.Rational:
return(new Rational
{
Denominator = BitConverter.ToInt32(bytes, 0),
Numerator = BitConverter.ToInt32(bytes, 4)
});
default:
return(bytes);
}
}
/// <summary>
/// Ctor
/// </summary>
/// <param name="property"></param>
public ExifProperty(PropertyItem property)
{
this.id = property.Id;
this.type = (ExifType)property.Type;
this.value = ExifDecoder.FromPropertyItem(property);
}
/// <summary>
/// Converts a property item to an object or array of objects.
/// </summary>
/// <param name="propertyItem">the property item to convert</param>
/// <returns>the property value</returns>
public static object FromPropertyItem(PropertyItem propertyItem)
{
if (propertyItem == null)
{
return(null);
}
object data = null;
ExifTag tag = ExifTag.Unknown;
Type dataType = null;
if (Enum.IsDefined(typeof(ExifTag), propertyItem.Id))
{
tag = (ExifTag)propertyItem.Id;
dataType = ExifDataTypeAttribute.GetDataType(tag);
}
ExifType type = (ExifType)propertyItem.Type;
switch (type)
{
case ExifType.Ascii:
{
// The value represents an array of chars terminated with null ('\0') char
data = Encoding.ASCII.GetString(propertyItem.Value).TrimEnd('\0');
break;
}
case ExifType.Byte:
{
switch (tag)
{
case ExifTag.MSTitle:
case ExifTag.MSSubject:
case ExifTag.MSAuthor:
case ExifTag.MSKeywords:
case ExifTag.MSComments:
{
// The value represents an array of unicode bytes terminated with null ('\0') char
data = Encoding.Unicode.GetString(propertyItem.Value).TrimEnd('\0');
break;
}
default:
{
// The value represents an array of bytes
data = propertyItem.Value;
break;
}
}
break;
}
case ExifType.Raw:
{
// The value represents an array of bytes
data = propertyItem.Value;
break;
}
case ExifType.UInt16:
{
// The value represents an array of unsigned 16-bit integers.
int count = propertyItem.Len / UInt16Size;
ushort[] result = new ushort[count];
for (int i = 0; i < count; i++)
{
result[i] = ReadUInt16(propertyItem.Value, i * UInt16Size);
}
data = result;
break;
}
case ExifType.Int32:
{
// The value represents an array of signed 32-bit integers.
int count = propertyItem.Len / Int32Size;
int[] result = new int[count];
for (int i = 0; i < count; i++)
{
result[i] = ReadInt32(propertyItem.Value, i * Int32Size);
}
data = result;
break;
}
case ExifType.UInt32:
{
// The value represents an array of unsigned 32-bit integers.
int count = propertyItem.Len / UInt32Size;
uint[] result = new uint[count];
for (int i = 0; i < count; i++)
{
result[i] = ReadUInt32(propertyItem.Value, i * UInt32Size);
}
data = result;
break;
}
case ExifType.Rational:
{
// The value represents an array of signed rational numbers
// Numerator is an Int32 value, denominator a UInt32 value.
int count = propertyItem.Len / RationalSize;
Rational <int>[] result = new Rational <int> [count];
for (int i = 0; i < count; i++)
{
result[i] = new Rational <int>(
ReadInt32(propertyItem.Value, i * RationalSize),
ReadInt32(propertyItem.Value, i * RationalSize + Int32Size));
}
data = result;
break;
}
case ExifType.URational:
{
// The value represents an array of signed rational numbers
// Numerator and denominator are UInt32 values.
int count = propertyItem.Len / URationalSize;
Rational <uint>[] result = new Rational <uint> [count];
for (int i = 0; i < count; i++)
{
result[i] = new Rational <uint>(
ReadUInt32(propertyItem.Value, i * URationalSize),
ReadUInt32(propertyItem.Value, i * URationalSize + UInt32Size));
}
data = result;
break;
}
default:
{
data = propertyItem.Value;
break;
}
}
return(ExifDecoder.ConvertData(dataType, data));
}
/// <summary>
/// Ctor
/// </summary>
/// <param name="ns">fully qualified XMP namespace URI</param>
public ExifPropertyAttribute(ExifType valueType, XmpQuantity quantity)
{
this.ValueType = valueType;
this.Quantity = quantity;
}
/// <summary>
/// Ctor
/// </summary>
/// <param name="ns">fully qualified XMP namespace URI</param>
public ExifPropertyAttribute(ExifType valueType)
{
this.ValueType = valueType;
}
/// <summary>
/// Ctor
/// </summary>
/// <param name="type"></param>
/// <param name="exifType"></param>
public ExifDataTypeAttribute(Type type, ExifType exifType)
{
this.dataType = type;
this.exifType = exifType;
}
/// <summary>
/// Ctor
/// </summary>
/// <param name="exifType"></param>
public ExifDataTypeAttribute(ExifType exifType)
{
this.exifType = exifType;
}
public bool SetParameter(int id, byte[] data, ExifType type, bool rewrite = true)
{
throw new NotImplementedException();
}
