public PentaxMakerNotes(byte[] aData)
: base(new MemoryStream(aData))
{
string testVersion = ReadStr(4);
if (testVersion == "AOC\0")
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess for maker notes");
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
}
else
{
Seek(0, SeekOrigin.Begin);
testVersion = ReadStr(8);
if (testVersion == "PENTAX \0")
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess for maker notes");
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
}
}
mEntries = new List <PentaxMakerNotesEntry>();
mEntryCount = ReadUI2();
for (ushort i = 0; i < mEntryCount; i++)
{
PentaxMakerNotesEntry entry = PentaxMakerNotesEntry.CreatePentaxMakerNotesEntry(this);
mEntries.Add(entry);
}
MNPreviewImageSize imagesize = GetEntry <MNPreviewImageSize>();
MNPreviewImageLength imagelength = GetEntry <MNPreviewImageLength>();
MNPreviewImageStart imagestart = GetEntry <MNPreviewImageStart>();
MNPreviewImageBorders imageborder = GetEntry <MNPreviewImageBorders>();
uint curPos = Position();
Seek(imagestart.Value, SeekOrigin.Begin);
byte[] data = mFileReader.ReadBytes((int)imagelength.Value);
Seek(curPos, SeekOrigin.Begin);
}
public PentaxMakerNotes(byte[] aData, uint offset)
: base(new MemoryStream(aData))
{
//FileStream fs = new FileStream("dumpMakerNote.bin", FileMode.Create, FileAccess.Write);
//fs.Write(aData, 0, aData.Length);
//fs.Close();
mAdditionalOffset = 0;
mEntries = new List <PentaxMakerNotesEntry>();
string testVersion = ReadStr(4);
if (testVersion == "AOC\0")
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess for maker notes");
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
mAdditionalOffset = (int)offset;
}
else
{
Seek(0, SeekOrigin.Begin);
testVersion = ReadStr(8);
if (testVersion == "PENTAX \0")
{
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess for maker notes");
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
}
else
{
Seek(0, SeekOrigin.Begin);
testVersion = ReadStr(10);
const int SizeAdobeHeader = 20;
if (testVersion == "Adobe\0MakN")
{
uint byteCount = mFileReader.ReadUInt32();
if (BitConverter.IsLittleEndian)
{
byteCount = ((byteCount >> 24) |
((byteCount << 8) & 0x00FF0000) |
((byteCount >> 8) & 0x0000FF00) |
(byteCount << 24));
}
byte a = mFileReader.ReadByte();
byte b = mFileReader.ReadByte();
bool fileIsLittleEndian;
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess for maker notes");
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
uint temp = mFileReader.ReadUInt32();
if (mEndianSwap)
{
temp = ((temp >> 24) |
((temp << 8) & 0x00FF0000) |
((temp >> 8) & 0x0000FF00) |
(temp << 24));
}
mAdditionalOffset = (int)temp;
testVersion = ReadStr(4);
if (testVersion == "AOC\0")
{
a = mFileReader.ReadByte();
b = mFileReader.ReadByte();
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess for maker notes");
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
mAdditionalOffset -= SizeAdobeHeader;
}
else
{
Seek(Position() - 4, SeekOrigin.Begin);
testVersion = ReadStr(8);
if (testVersion == "PENTAX \0")
{
a = mFileReader.ReadByte();
b = mFileReader.ReadByte();
if (a == b && b == 'I')
{
fileIsLittleEndian = true;
}
else
if (a == b && b == 'M')
{
fileIsLittleEndian = false;
}
else
{
throw new FileLoadException("Could not determine file endianess for maker notes");
}
mEndianSwap = fileIsLittleEndian != BitConverter.IsLittleEndian;
mAdditionalOffset = -SizeAdobeHeader;
}
}
/* Following Exiftool:
* 1. Six bytes containing the zero-terminated string "Adobe". (The DNG specification calls for the DNGPrivateData tag to start with an ASCII string identifying the creator/format).
* 2. 4 bytes: an ASCII string ("MakN" for a Makernote), indicating what sort of data is being stored here. Note that this is not zero-terminated.
* 3. A four-byte count (number of data bytes following); this is the length of the original MakerNote data. (This is always in "most significant byte first" format).
* 4. 2 bytes: the byte-order indicator from the original file (the usual 'MM'/4D4D or 'II'/4949).
* 5. 4 bytes: the original file offset for the MakerNote tag data (stored according to the byte order given above).
* 6. The contents of the MakerNote tag. This is a simple byte-for-byte copy, with no modification.
*/
}
else
{
return; //Not a Pentax make note, can't handle it...
}
}
}
mEntryCount = ReadUI2();
for (ushort i = 0; i < mEntryCount; i++)
{
PentaxMakerNotesEntry entry = PentaxMakerNotesEntry.CreatePentaxMakerNotesEntry(this);
mEntries.Add(entry);
}
//MNPreviewImageSize imagesize = GetEntry<MNPreviewImageSize>();
//MNPreviewImageLength imagelength = GetEntry<MNPreviewImageLength>();
//MNPreviewImageStart imagestart = GetEntry<MNPreviewImageStart>();
//MNPreviewImageBorders imageborder = GetEntry<MNPreviewImageBorders>();
//uint curPos = Position();
//Seek(imagestart.Value, SeekOrigin.Begin);
//byte[] data = mFileReader.ReadBytes((int)imagelength.Value);
//Seek(curPos, SeekOrigin.Begin);
}