internal List <IFDField> GetIFDFields <T>(IFDHeaderType block, List <byte> fileBytes, int blockDataOffset, int fieldsCount, int currentBlockTiffHeaderOffset, Endianness e, out int lastBlockByteFileOffset)
{
lastBlockByteFileOffset = 0;
List <IFDField> result = new List <IFDField>();
byte[][] fieldsBytes = ExtractTagsBytes(ByteManager.ChopByteArray(fileBytes.ToArray(), blockDataOffset + 2, fieldsCount * 12).ToList(), fieldsCount).ToArray();
foreach (byte[] fieldBytes in fieldsBytes)
{
IFDField field = GetIFDField <T>(fieldBytes, e);
field.Block = block;
lastBlockByteFileOffset = LoadFieldTextValue <T>(ref field, fileBytes, blockDataOffset, currentBlockTiffHeaderOffset, e, lastBlockByteFileOffset);
result.Add(field);
}
return(result);
}
internal IFDHeader GetIFDHeader <T>(IFDHeaderType blockType, List <byte> fileBytes, int blockDataOffset, int tiffHeaderOffset, Endianness e)
{
if ((blockType == IFDHeaderType.InteroperatibilityIFD || blockType == IFDHeaderType.FirstIFD) &&
blockDataOffset == tiffHeaderOffset)
{
return(null);
}
int lastBlockByteFileOffset = 0;
IFDHeader result = new IFDHeader(typeof(T));
byte[] fieldsCountBytes = ByteManager.ChopByteArray(fileBytes.ToArray(), blockDataOffset, 2);
byte[] sortedFieldsCountBytes = SortBytes(e, fieldsCountBytes);
result.FieldsCount = ByteManager.GetIntValue(sortedFieldsCountBytes);
result.IFDFields = GetIFDFields <T>(blockType, fileBytes, blockDataOffset, (int)result.FieldsCount, tiffHeaderOffset, e, out lastBlockByteFileOffset);
if (blockType == IFDHeaderType.ZerothIFD)
{
result.OffsetToNextIFD = lastBlockByteFileOffset - blockDataOffset;
}
else if (blockType == IFDHeaderType.ExifIFD)
{
var query = from f in result.IFDFields where f.FieldCode == (uint)IFDTagCode.InteropOffset select f;
if (query != null && query.Count() > 0)
{
IFDField interopField = query.First();
result.OffsetToNextIFD = ByteManager.GetIntValue(interopField.FieldValueElements);
}
}
byte[] offsetToNextIFDHeader = ByteManager.ChopByteArray(fileBytes.ToArray(), blockDataOffset + 2 + result.FieldsCount * 12, 4);
byte[] sortedOffsetToNextIFDHeader = SortBytes(e, offsetToNextIFDHeader);
int offset = ByteManager.GetIntValue(sortedOffsetToNextIFDHeader);
result.OffsetTo1stIFD = offset;
return(result);
}
