public static async Task <ImageFileDirectory> LoadFromStream(Stream stream, bool isLitteleEndian)
{
var ifd = new ImageFileDirectory();
var binaryReader = new BinaryTools.BinaryReader(stream, isLitteleEndian);
var count = await binaryReader.ReadUInt16Async();
for (int i = 0; i < count; ++i)
{
var ifdEntry = await IFDEntry.LoadFromStream(stream, isLitteleEndian);
ifd.IFDEntries.Add(ifdEntry);
}
ifd.OffsetOfNextIFD = await binaryReader.ReadUInt32Async();
return(ifd);
}
public static async Task <ImageFileHeader> LoadFromStream(Stream stream)
{
var ifh = new ImageFileHeader();
var TIFFBOM = new byte[2];
await stream.ReadAsync(TIFFBOM, 0, 2);
var BOMValue = System.Text.Encoding.ASCII.GetString(TIFFBOM);
ifh.IsLittleEndian = BOMValue == "II";
var binaryReader = new BinaryTools.BinaryReader(stream, ifh.IsLittleEndian);
await binaryReader.ReadUInt16Async(); // dispose 42
ifh.OffsetOf1stIFD = await binaryReader.ReadUInt32Async();
return(ifh);
}
public static async Task <IFDEntry> LoadFromStream(Stream stream, bool isLittleEndian)
{
var entryBegin = stream.Position;
var binaryReader = new BinaryTools.BinaryReader(stream, isLittleEndian);
var tag = await binaryReader.ReadUInt16Async();
var fieldType = (FieldTypeEnum)await binaryReader.ReadUInt16Async();
var count = await binaryReader.ReadUInt32Async();
var offset = 0U;
var valueLength = GetValuesLength(fieldType, count);
if (valueLength > 4)
{
offset = await binaryReader.ReadUInt32Async();
stream.Position = offset;
}
IFDEntry ifdEntry;
switch (fieldType)
{
case FieldTypeEnum.BYTE:
{
ifdEntry = new BYTEEntry();
var array = new byte[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadByteAsync();
}
(ifdEntry as BYTEEntry).Values = array;
}
break;
case FieldTypeEnum.SHORT:
{
ifdEntry = new SHORTEntry();
var array = new ushort[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadUInt16Async();
}
(ifdEntry as SHORTEntry).Values = array;
}
break;
case FieldTypeEnum.LONG:
{
ifdEntry = new LONGEntry();
var array = new uint[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadUInt32Async();
}
(ifdEntry as LONGEntry).Values = array;
}
break;
case FieldTypeEnum.SBYTE:
{
ifdEntry = new SBYTEEntry();
var array = new sbyte[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadSByteAsync();
}
(ifdEntry as SBYTEEntry).Values = array;
}
break;
case FieldTypeEnum.SSHORT:
{
ifdEntry = new SSHORTEntry();
var array = new short[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadInt16Async();
}
(ifdEntry as SSHORTEntry).Values = array;
}
break;
case FieldTypeEnum.SLONG:
{
ifdEntry = new SLONGEntry();
var array = new int[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadInt32Async();
}
(ifdEntry as SLONGEntry).Values = array;
}
break;
case FieldTypeEnum.FLOAT:
{
ifdEntry = new FLOATEntry();
var array = new float[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadSingleAsync();
}
(ifdEntry as FLOATEntry).Values = array;
}
break;
case FieldTypeEnum.DOUBLE:
{
ifdEntry = new DOUBLEEntry();
var array = new double[count];
for (int i = 0; i < count; ++i)
{
array[i] = await binaryReader.ReadDoubleAsync();
}
(ifdEntry as DOUBLEEntry).Values = array;
}
break;
case FieldTypeEnum.ASCII:
{
ifdEntry = new ASCIIEntry();
var data = new byte[count];
var read = await binaryReader.ReadAsync(data, 0, data.Length);
if (read != data.Length)
{
throw new Exception("Can not read enough data.");
}
var all = System.Text.Encoding.ASCII.GetString(data, 0, data.Length);
var strings = all.Split(new char[] { '\0' });
(ifdEntry as ASCIIEntry).Values = strings.Take(strings.Length - 1).ToArray();
}
break;
case FieldTypeEnum.UNDEFINED:
{
ifdEntry = new UNDEFINEDEntry();
var data = new byte[count];
var read = await binaryReader.ReadAsync(data, 0, data.Length);
if (read != data.Length)
{
throw new Exception("Can not read enough data.");
}
(ifdEntry as UNDEFINEDEntry).Value = data;
}
break;
case FieldTypeEnum.RATIONAL:
{
ifdEntry = new RATIONALEntry();
var first = new uint[count];
var second = new uint[count];
for (int i = 0; i < count; ++i)
{
first[i] = await binaryReader.ReadUInt32Async();
second[i] = await binaryReader.ReadUInt32Async();
}
(ifdEntry as RATIONALEntry).First = first;
(ifdEntry as RATIONALEntry).Second = second;
}
break;
case FieldTypeEnum.SRATIONAL:
{
ifdEntry = new SRATIONALEntry();
var first = new int[count];
var second = new int[count];
for (int i = 0; i < count; ++i)
{
first[i] = await binaryReader.ReadInt32Async();
second[i] = await binaryReader.ReadInt32Async();
}
(ifdEntry as SRATIONALEntry).First = first;
(ifdEntry as SRATIONALEntry).Second = second;
}
break;
default:
throw new Exception("Specified fieldType is not defined in TIFF 6.0 and not supported.");
}
stream.Position = entryBegin + 12;
ifdEntry.Tag = tag;
ifdEntry.FieldType = fieldType;
ifdEntry.Count = count;
ifdEntry.ValueOffset = offset;
return(ifdEntry);
}