/// <summary>
/// Parse IFD section of Jpeg's header.
/// </summary>
/// <param name="App1Data">Raw data of App1 section</param>
/// <param name="IfdOffset">Offset to the target IFD section from start of App1 data.</param>
/// <param name="IfdSectionEndian">Alignment of all sections of this IFD data. This value is contained in TIFF header.</param>
/// <returns>All entries in given IFD section.</returns>
public static IfdData ParseIfd(byte[] App1Data, UInt32 IfdOffset, Definitions.Endian IfdSectionEndian)
{
var ifd = new IfdData();
ifd.Offset = IfdOffset;
var entries = new Dictionary<UInt32, Entry>();
var EntryNum = Util.GetUIntValue(App1Data, (int)IfdOffset, 2, IfdSectionEndian);
// Debug.WriteLine("Entry num: " + EntryNum);
ifd.NextIfdPointer = Util.GetUIntValue(App1Data, (int)IfdOffset + 2 + (int)EntryNum * ENTRY_SIZE, 4, IfdSectionEndian);
// if there's no extra data area, (if all data is 4 bytes or less), this is length of this IFD section.
ifd.Length = 2 + EntryNum * ENTRY_SIZE + 4; // entry num (2 bytes), each entries (12 bytes each), Next IFD pointer (4 byte)
for (int i = 0; i < EntryNum; i++)
{
// Debug.WriteLine("--- Entry[" + i + "] ---");
var EntryOrigin = (int)IfdOffset + 2 + i * ENTRY_SIZE;
var entry = new Entry();
// tag
entry.Tag = Util.GetUIntValue(App1Data, EntryOrigin, 2, IfdSectionEndian);
var tagTypeName = "Unknown";
if (Util.TagNames.ContainsKey(entry.Tag))
{
tagTypeName = Util.TagNames[entry.Tag];
}
// Debug.WriteLine("Tag: " + entry.Tag.ToString("X") + " " + tagTypeName);
// type
var typeValue = Util.GetUIntValue(App1Data, EntryOrigin + 2, 2, IfdSectionEndian);
entry.Type = Util.ToEntryType(typeValue);
// Debug.WriteLine("Type: " + entry.Type.ToString());
// count
entry.Count = Util.GetUIntValue(App1Data, EntryOrigin + 4, 4, IfdSectionEndian);
// Debug.WriteLine("Count: " + entry.Count);
var valueSize = 0;
valueSize = Util.FindDataSize(entry.Type);
var TotalValueSize = valueSize * (int)entry.Count;
// Debug.WriteLine("Total value size: " + TotalValueSize);
var valueBuff = new byte[TotalValueSize];
if (TotalValueSize <= 4)
{
// in this case, the value is stored directly here.
Array.Copy(App1Data, EntryOrigin + 8, valueBuff, 0, TotalValueSize);
}
else
{
// other cases, actual value is stored in separated area
var EntryValuePointer = (int)Util.GetUIntValue(App1Data, EntryOrigin + 8, 4, IfdSectionEndian);
// Debug.WriteLine("Entry pointer: " + EntryValuePointer.ToString("X"));
Array.Copy(App1Data, EntryValuePointer, valueBuff, 0, TotalValueSize);
// If there's extra data, its length should be added to total length.
ifd.Length += (UInt32)TotalValueSize;
}
if (IfdSectionEndian != Entry.InternalEndian)
{
// to change endian, each sections should be reversed.
var ReversedValue = new byte[valueBuff.Length];
var valueLength = Util.FindDataSize(entry.Type);
if (valueLength == 8)
{
// for fraction value, each value should be reversed individually
valueLength = 4;
}
var valueNum = valueBuff.Length / valueLength;
for (int j = 0; j < valueNum; j++)
{
var tempValue = new byte[valueLength];
Array.Copy(valueBuff, j * valueLength, tempValue, 0, valueLength);
Array.Reverse(tempValue);
Array.Copy(tempValue, 0, ReversedValue, j * valueLength, valueLength);
}
entry.value = ReversedValue;
}
else
{
// if internal endian and target metadata's one is same, no need to reverse.
entry.value = valueBuff;
}
switch (entry.Type)
{
case Entry.EntryType.Ascii:
// Debug.WriteLine("value: " + entry.StringValue + Environment.NewLine + Environment.NewLine);
// Debug.WriteLine(" ");
break;
case Entry.EntryType.Byte:
case Entry.EntryType.Undefined:
if (entry.Tag == 0x927C)
{
// Debug.WriteLine("Maker note is too long to print.");
}
else
{
foreach (int val in entry.UIntValues)
{
// Debug.WriteLine("value: " + val.ToString("X"));
}
}
break;
case Entry.EntryType.Short:
case Entry.EntryType.SShort:
case Entry.EntryType.Long:
case Entry.EntryType.SLong:
// Util.DumpByteArrayAll(entry.value);
foreach (int val in entry.UIntValues)
{
// Debug.WriteLine("value: " + val);
}
break;
case Entry.EntryType.Rational:
case Entry.EntryType.SRational:
// Util.DumpByteArrayAll(entry.value);
foreach (double val in entry.DoubleValues)
{
// Debug.WriteLine("value: " + val);
}
break;
default:
break;
}
entries[entry.Tag] = entry;
}
ifd.Entries = entries;
return ifd;
}
public static IfdData CreateGpsIfdData(Geoposition position)
{
var gpsIfdData = new IfdData();
gpsIfdData.Entries = new Dictionary<UInt32, Entry>();
var GPSVersionEntry = new Entry()
{
Tag = 0x0,
Type = Entry.EntryType.Byte,
Count = 4,
};
GPSVersionEntry.UIntValues = new UInt32[] { 2, 2, 0, 0 };
gpsIfdData.Entries.Add(GPSVersionEntry.Tag, GPSVersionEntry);
var LatitudeRefEntry = new Entry()
{
Tag = 0x1,
Type = Entry.EntryType.Ascii,
Count = 2,
};
char latRef;
double latitude = 0;
#if (WINDOWS_APP || WINDOWS_UWP)
latitude = position.Coordinate.Point.Position.Latitude;
#elif WINDOWS_PHONE
latitude = position.Coordinate.Latitude;
#endif
if (latitude > 0)
{
latRef = 'N';
}
else
{
latRef = 'S';
latitude *= -1;
}
LatitudeRefEntry.UIntValues = new UInt32[] { (byte)latRef, 0 };
gpsIfdData.Entries.Add(LatitudeRefEntry.Tag, LatitudeRefEntry);
var LatitudeEntry = new Entry()
{
Tag = 0x2,
Type = Entry.EntryType.Rational,
Count = 3,
};
var LatDeg = Math.Floor(latitude);
var LatMin = Math.Floor((latitude - LatDeg) * 60);
var LatSec = Util.ToRoundUp(((latitude - LatDeg) * 60 - LatMin) * 60, 2);
Debug.WriteLine("Latitude: " + LatDeg + " " + LatMin + " " + LatSec);
try
{
LatitudeEntry.DoubleValues = new double[] { LatDeg, LatMin, LatSec };
}
catch (OverflowException)
{
var sec = Util.ToRoundUp(((latitude - LatDeg) * 60 - LatMin) * 60, 0);
Debug.WriteLine("Latitude: " + LatDeg + " " + LatMin + " " + sec);
LatitudeEntry.DoubleValues = new double[] { LatDeg, LatMin, sec };
}
gpsIfdData.Entries.Add(LatitudeEntry.Tag, LatitudeEntry);
var LongitudeRef = new Entry()
{
Tag = 0x3,
Type = Entry.EntryType.Ascii,
Count = 3,
};
char lonRef;
double longitude = 0;
#if (WINDOWS_APP || WINDOWS_UWP)
longitude = position.Coordinate.Point.Position.Longitude;
#elif WINDOWS_PHONE
longitude = position.Coordinate.Longitude;
#endif
if (longitude > 0)
{
lonRef = 'E';
}
else
{
lonRef = 'W';
longitude *= -1;
}
LongitudeRef.UIntValues = new UInt32[] { (byte)lonRef, 0 };
gpsIfdData.Entries.Add(LongitudeRef.Tag, LongitudeRef);
var Longitude = new Entry()
{
Tag = 0x4,
Type = Entry.EntryType.Rational,
Count = 3,
};
var LonDeg = Math.Floor(longitude);
var LonMin = Math.Floor((longitude - LonDeg) * 60);
var LonSec = Util.ToRoundUp(((longitude - LonDeg) * 60 - LonMin) * 60, 2);
Debug.WriteLine("Longitude: " + LonDeg + " " + LonMin + " " + LonSec);
try
{
Longitude.DoubleValues = new double[] { LonDeg, LonMin, LonSec };
}
catch (OverflowException)
{
var sec = Util.ToRoundUp(((longitude - LonDeg) * 60 - LonMin) * 60, 0);
Debug.WriteLine("Longitude: " + LonDeg + " " + LonMin + " " + sec);
Longitude.DoubleValues = new double[] { LonDeg, LonMin, sec };
}
gpsIfdData.Entries.Add(Longitude.Tag, Longitude);
var TimeStampEntry = new Entry()
{
Tag = 0x7,
Type = Entry.EntryType.Rational,
Count = 3,
};
TimeStampEntry.DoubleValues = new double[] { position.Coordinate.Timestamp.Hour, position.Coordinate.Timestamp.Minute, position.Coordinate.Timestamp.Second };
gpsIfdData.Entries.Add(TimeStampEntry.Tag, TimeStampEntry);
var GpsMapDetum = new Entry()
{
Tag = 0x12,
Type = Entry.EntryType.Ascii,
Count = 7,
};
GpsMapDetum.value = Util.ToByte("WGS-84");
gpsIfdData.Entries.Add(GpsMapDetum.Tag, GpsMapDetum);
var GpsDateStamp = new Entry()
{
Tag = 0x1D,
Type = Entry.EntryType.Ascii,
Count = 11,
};
String str = position.Coordinate.Timestamp.Year.ToString("D4") + ":" + position.Coordinate.Timestamp.Month.ToString("D2") + ":" + position.Coordinate.Timestamp.Day.ToString("D2");
GpsDateStamp.value = Util.ToByte(str);
gpsIfdData.Entries.Add(GpsDateStamp.Tag, GpsDateStamp);
return gpsIfdData;
}
/// <summary>
/// Create app1 data section in byte array.
/// Needs many informations....
/// </summary>
/// <param name="OriginalMetaData">metadata from original image.</param>
/// <param name="NewMetaData">metadata which will be recorded in app1 data section</param>
/// <param name="OriginalApp1Data">Original app1 data. Other than Exif meta data will be copied to new one</param>
/// <param name="OutputImageMetadataEndian">Endian which will be used in Exif meta data. for WP OS, Big endian is recommended.</param>
/// <returns></returns>
private static byte[] CreateApp1Data(JpegMetaData OriginalMetaData, JpegMetaData NewMetaData, byte[] OriginalApp1Data, Definitions.Endian OutputImageMetadataEndian)
{
if (NewMetaData.ExifIfd != null && !NewMetaData.PrimaryIfd.Entries.ContainsKey(Definitions.EXIF_IFD_POINTER_TAG))
{
// Add Exif IFD section's pointer entry as dummy.
NewMetaData.PrimaryIfd.Entries.Add(
Definitions.EXIF_IFD_POINTER_TAG,
new Entry()
{
Tag = Definitions.EXIF_IFD_POINTER_TAG,
Type = Entry.EntryType.Long,
Count = 1,
value = new byte[] { 0, 0, 0, 0 }
});
}
if (NewMetaData.GpsIfd != null && !NewMetaData.PrimaryIfd.Entries.ContainsKey(Definitions.GPS_IFD_POINTER_TAG))
{
// Add GPS IFD section's pointer entry as dummy
NewMetaData.PrimaryIfd.Entries.Add(
Definitions.GPS_IFD_POINTER_TAG,
new Entry()
{
Tag = Definitions.GPS_IFD_POINTER_TAG,
Type = Entry.EntryType.Long,
Count = 1,
value = new byte[] { 0, 0, 0, 0 }
});
}
byte[] primaryIfd = IfdComposer.ComposeIfdsection(NewMetaData.PrimaryIfd, OutputImageMetadataEndian);
byte[] exifIfd = new byte[] { };
byte[] gpsIfd = new byte[] { };
if (NewMetaData.ExifIfd != null)
{
exifIfd = IfdComposer.ComposeIfdsection(NewMetaData.ExifIfd, OutputImageMetadataEndian);
}
if (NewMetaData.GpsIfd != null)
{
gpsIfd = IfdComposer.ComposeIfdsection(NewMetaData.GpsIfd, OutputImageMetadataEndian);
}
// Debug.WriteLine("Size fixed. Primary: " + primaryIfd.Length.ToString("X") + " exif: " + exifIfd.Length.ToString("X") + " gps: " + gpsIfd.Length.ToString("X"));
// after size fixed, set each IFD sections' offset.
NewMetaData.PrimaryIfd.Offset = 8; // fixed value
// now it's possible to calcurate pointer to Exif/GPS IFD
var exifIfdPointer = 8 + primaryIfd.Length;
var gpsIfdPointer = 8 + primaryIfd.Length + exifIfd.Length;
if (NewMetaData.PrimaryIfd.Entries.ContainsKey(Definitions.EXIF_IFD_POINTER_TAG))
{
NewMetaData.PrimaryIfd.Entries.Remove(Definitions.EXIF_IFD_POINTER_TAG);
}
var exifIfdPointerEntry = new Entry()
{
Tag = Definitions.EXIF_IFD_POINTER_TAG,
Type = Entry.EntryType.Long,
Count = 1,
};
exifIfdPointerEntry.UIntValues = new UInt32[] { (UInt32)exifIfdPointer };
NewMetaData.PrimaryIfd.Entries.Add(Definitions.EXIF_IFD_POINTER_TAG, exifIfdPointerEntry);
if (NewMetaData.PrimaryIfd.Entries.ContainsKey(Definitions.GPS_IFD_POINTER_TAG))
{
NewMetaData.PrimaryIfd.Entries.Remove(Definitions.GPS_IFD_POINTER_TAG);
}
var gpsIfdPointerEntry = new Entry()
{
Tag = Definitions.GPS_IFD_POINTER_TAG,
Type = Entry.EntryType.Long,
Count = 1,
};
gpsIfdPointerEntry.UIntValues = new UInt32[] { (UInt32)gpsIfdPointer };
NewMetaData.PrimaryIfd.Entries.Add(Definitions.GPS_IFD_POINTER_TAG, gpsIfdPointerEntry);
var nextIfdPointer = 8 + primaryIfd.Length + exifIfd.Length + gpsIfd.Length;
NewMetaData.PrimaryIfd.NextIfdPointer = (UInt32)nextIfdPointer;
// finally, create byte array again
primaryIfd = IfdComposer.ComposeIfdsection(NewMetaData.PrimaryIfd, OutputImageMetadataEndian);
if (NewMetaData.ExifIfd != null)
{
NewMetaData.ExifIfd.Offset = 8 + (UInt32)primaryIfd.Length;
exifIfd = IfdComposer.ComposeIfdsection(NewMetaData.ExifIfd, OutputImageMetadataEndian);
}
if (NewMetaData.GpsIfd != null)
{
NewMetaData.GpsIfd.Offset = 8 + (UInt32)primaryIfd.Length + (UInt32)exifIfd.Length;
gpsIfd = IfdComposer.ComposeIfdsection(NewMetaData.GpsIfd, OutputImageMetadataEndian);
}
// 1st IFD data (after primary IFD data) should be kept
var Original1stIfdData = new byte[OriginalApp1Data.Length - OriginalMetaData.PrimaryIfd.NextIfdPointer];
Array.Copy(OriginalApp1Data, (int)OriginalMetaData.PrimaryIfd.NextIfdPointer, Original1stIfdData, 0, Original1stIfdData.Length);
// Build App1 section. From "Exif\0\0" to end of thumbnail data (1st IFD)
// Exif00 + TIFF header + 3 IFD sections (Primary, Exif, GPS) + 1st IFD data from original data
// new app1 size may overfrow from 0xFFFF bytes. in this case, it should be limited up to 0xFFFF byte.
var NewApp1DataSize = Math.Min(0xFFFF, 6 + 8 + primaryIfd.Length + exifIfd.Length + gpsIfd.Length + Original1stIfdData.Length);
var NewApp1DataOverflowSize = 0;
if (NewApp1DataSize == 0xFFFF)
{
NewApp1DataOverflowSize = (6 + 8 + primaryIfd.Length + exifIfd.Length + gpsIfd.Length + Original1stIfdData.Length) - 0xFFFF;
Debug.WriteLine("App1 overflow size: " + NewApp1DataOverflowSize);
}
var NewApp1Data = new byte[NewApp1DataSize];
// var NewApp1Data = new byte[6 + 8 + primaryIfd.Length + exifIfd.Length + gpsIfd.Length];
// Debug.WriteLine("New App1 size: " + NewApp1Data.Length.ToString("X"));
// Array.Copy(OriginalApp1Data, 0, NewApp1Data, 0, 6 + 8);
Array.Copy(OriginalApp1Data, 0, NewApp1Data, 0, 6); // only EXIF00 should be copied.
var endianSection = Util.ToByte(0x4d4d, 2, OutputImageMetadataEndian);
Array.Copy(endianSection, 0, NewApp1Data, 6, 2);
var magicNumber = Util.ToByte(0x002A, 2, OutputImageMetadataEndian);
Array.Copy(magicNumber, 0, NewApp1Data, 8, 2);
var primaryIfdOffset = Util.ToByte(8, 4, OutputImageMetadataEndian);
Array.Copy(primaryIfdOffset, 0, NewApp1Data, 10, 4);
Array.Copy(primaryIfd, 0, NewApp1Data, 6 + 8, primaryIfd.Length);
Array.Copy(exifIfd, 0, NewApp1Data, 6 + 8 + primaryIfd.Length, exifIfd.Length);
Array.Copy(gpsIfd, 0, NewApp1Data, 6 + 8 + primaryIfd.Length + exifIfd.Length, gpsIfd.Length);
Array.Copy(Original1stIfdData, 0, NewApp1Data, 6 + 8 + primaryIfd.Length + exifIfd.Length + gpsIfd.Length, Original1stIfdData.Length - NewApp1DataOverflowSize);
return NewApp1Data;
}
