private void ReadImageFileHeader()
{
_reader.Stream.Position = 0;
short byteOrder = _reader.ReadInt16();
if (byteOrder == 0x4949)
{
_reader.StreamIsLittleEndian = true;
}
else if (byteOrder == 0x4d4d)
{
_reader.StreamIsLittleEndian = false;
}
else
{
throw new Exception($"Not a TIFF file: {byteOrder}");
}
short meaningOfLife = _reader.ReadInt16();
if (meaningOfLife == 42)
{
_bigTiff = false;
}
else if (meaningOfLife == 43)
{
_bigTiff = true;
}
else
{
throw new Exception($"Not a TIFF file. Life: {meaningOfLife}");
}
if (_bigTiff)
{
if (_reader.ReadUInt16() != 8)
{
throw new Exception("Offset should be size 8 in BigTIFF");
}
_reader.ReadUInt16(); // always 0
}
}
private object ReadFieldValueAsObject(BinaryReader2 reader, FieldType fieldType)
{
switch (fieldType)
{
case FieldType.Int64:
return(reader.ReadInt64());
case FieldType.UInt64:
return(reader.ReadInt64());
case FieldType.Int32:
return(reader.ReadInt32());
case FieldType.UInt32:
return(reader.ReadUInt32());
case FieldType.Int16:
return(reader.ReadInt16());
case FieldType.UInt16:
return(reader.ReadUInt16());
case FieldType.Byte:
return(reader.ReadByte());
case FieldType.SByte:
return(reader.ReadSByte());
case FieldType.Float:
return(reader.ReadSingle());
case FieldType.Double:
return(reader.ReadDouble());
case FieldType.Rational:
return(new Rational(reader.ReadUInt32(), reader.ReadUInt32()));
case FieldType.SRational:
return(new SRational(reader.ReadInt32(), reader.ReadInt32()));
}
Console.WriteLine($"Unknown field type {fieldType}");
return(0);
}
private object[] ReadFieldValuesAsObjects(BinaryReader2 reader, FieldType fieldType, int numValues)
{
var array = new object[numValues];
switch (fieldType)
{
case FieldType.Int64:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadInt64();
}
}
break;
case FieldType.UInt64:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadInt64();
}
}
break;
case FieldType.Int32:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadInt32();
}
}
break;
case FieldType.UInt32:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadUInt32();
}
}
break;
case FieldType.Int16:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadInt16();
}
}
break;
case FieldType.UInt16:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadUInt16();
}
}
break;
case FieldType.SByte:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadSByte();
}
}
break;
case FieldType.Byte:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadByte();
}
}
break;
case FieldType.Float:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadSingle();
}
}
break;
case FieldType.Double:
{
for (int i = 0; i < numValues; i++)
{
array[i] = reader.ReadDouble();
}
}
break;
case FieldType.Rational:
{
for (int i = 0; i < numValues; i++)
{
array[i] = new Rational(reader.ReadUInt32(), reader.ReadUInt32());
}
}
break;
case FieldType.SRational:
{
for (int i = 0; i < numValues; i++)
{
array[i] = new SRational(reader.ReadInt32(), reader.ReadInt32());
}
}
break;
default:
throw new Exception($"Unknown field type {fieldType}");
}
return(array);
}