public ImageFileDirectory(FileReader aPefFile)
{
mPefFile = aPefFile;
mEntries = new List <ImageFileDirectoryEntry>();
mEntryCount = mPefFile.ReadUI2();
for (ushort i = 0; i < mEntryCount; i++)
{
ImageFileDirectoryEntry entry = ImageFileDirectoryEntry.CreateImageFileDirectoryEntry(mPefFile);
mEntries.Add(entry);
}
}
/// <summary>
/// Returns a <see cref="ImageFileDirectory" /> initialized from the given byte data.
/// </summary>
/// <param name="data">The data.</param>
/// <param name="offset">The offset into <paramref name="data" />.</param>
/// <param name="byteOrder">The byte order of <paramref name="data" />.</param>
/// <returns>A <see cref="ImageFileDirectory" /> initialized from the given byte data.</returns>
public static ImageFileDirectory FromBytes(byte[] data, uint offset, BitConverterEx.ByteOrder byteOrder)
{
var ifd = new ImageFileDirectory();
var conv = new BitConverterEx(byteOrder, BitConverterEx.SystemByteOrder);
var stripOffsets = new List <uint>();
var stripLengths = new List <uint>();
// Count
var fieldcount = conv.ToUInt16(data, offset);
// Read fields
for (uint i = 0; i < fieldcount; i++)
{
var fieldoffset = offset + 2 + (12 * i);
var field = ImageFileDirectoryEntry.FromBytes(data, fieldoffset, byteOrder);
ifd.Fields.Add(field);
// Read strip offsets
if (field.Tag == 273)
{
var baselen = field.Data.Length / (int)field.Count;
for (uint j = 0; j < field.Count; j++)
{
var val = new byte[baselen];
Array.Copy(field.Data, j * baselen, val, 0, baselen);
var stripOffset = field.Type == 3 ? BitConverter.ToUInt16(val, 0) : BitConverter.ToUInt32(val, 0);
stripOffsets.Add(stripOffset);
}
}
// Read strip lengths
if (field.Tag == 279)
{
var baselen = field.Data.Length / (int)field.Count;
for (uint j = 0; j < field.Count; j++)
{
var val = new byte[baselen];
Array.Copy(field.Data, j * baselen, val, 0, baselen);
var stripLength = field.Type == 3 ? BitConverter.ToUInt16(val, 0) : BitConverter.ToUInt32(val, 0);
stripLengths.Add(stripLength);
}
}
}
// Save strips
if (stripOffsets.Count != stripLengths.Count)
{
throw new NotValidTIFFileException();
}
for (var i = 0; i < stripOffsets.Count; i++)
{
ifd.Strips.Add(new TIFFStrip(data, stripOffsets[i], stripLengths[i]));
}
// Offset to next ifd
ifd.NextIFDOffset = conv.ToUInt32(data, offset + 2 + (12 * fieldcount));
return(ifd);
}
