internal static Page Read(byte[] data, int pos, bool flip)
{
var page = new Page();
ushort tagCount;
tagCount = BitConverter.ToUInt16(Tif.GetBytes(data, pos, 2, flip), 0);
if (tagCount == 0)
{
return(null);
}
pos += 2;
for (int i = 0; i < tagCount && pos < data.Length; i++)
{
try
{
var field = Field.Read(data, pos, flip);
if (field != null)
{
if (field.IsIfdField())
{
var subIfd = Ifd.ReadSubIfd(field, data, flip);
if (subIfd != null)
{
page.SubIfds.Add(subIfd);
}
}
page.Add(field);
}
}
catch (OutOfMemoryException)
{
//The field data is f****d
}
pos += 12;
}
page.NextIfdAddress = BitConverter.ToUInt32(Tif.GetBytes(data, pos, 4, flip), 0);
var(offsetField, countField) = GetOffsetAndCount(page);
page.ImageData = offsetField != null
? GetImageData(data, offsetField, countField)
: new List <byte[]>();
return(page);
}
public static Tif Load(byte[] data)
{
Tif tif;
int pos;
bool flip = false;
var byteOrder = (ByteOrder)BitConverter.ToUInt16(data, 0);
switch (byteOrder)
{
case ByteOrder.LittleEndian:
break;
case ByteOrder.BigEndian:
flip = true;
break;
default:
throw new NotSupportedException("Not a TIF file");
}
ushort meaning = BitConverter.ToUInt16(Tif.GetBytes(data, 2, 2, flip), 0);
if (meaning != 42)
{
throw new NotSupportedException("Not a TIF file");
}
pos = (int)BitConverter.ToUInt32(Tif.GetBytes(data, 4, 4, flip), 0);
if (pos > data.Length)
{
throw new NotSupportedException("Not a TIF file");
}
tif = ReadPages(data, pos, flip);
tif.ByteOrder = byteOrder;
tif.Source = data.ToString();
return(tif);
}