public static void CompareJpegMetaData(JpegMetaData meta1, JpegMetaData meta2, string filename, bool GpsIfdExists, bool ExifIfdExists = true)
{
Debug.WriteLine("file: " + filename);
TestUtil.AreEqual(meta1.App1Data, meta2.App1Data, filename + " App1 data");
TestUtil.AreEqual(meta1.PrimaryIfd, meta2.PrimaryIfd, filename + "Primary IFD");
if (ExifIfdExists)
{
TestUtil.AreEqual(meta1.ExifIfd, meta2.ExifIfd, filename + "Exif IFD");
}
else
{
Assert.IsNull(meta1.ExifIfd);
Assert.IsNull(meta2.ExifIfd);
}
if (GpsIfdExists)
{
TestUtil.AreEqual(meta1.GpsIfd, meta2.GpsIfd, filename + "Gps IFD");
}
else
{
Assert.IsNull(meta1.GpsIfd);
Assert.IsNull(meta2.GpsIfd);
}
}
/// <summary>
/// Set exif data to Jpeg file asynchronously.
/// Mess of this library; everything are caused by crazy Exif format.
/// Note that this function overwrites ALL Exif data in the given image.
/// </summary>
/// <param name="OriginalImage">Target image</param>
/// <param name="MetaData">An Exif data which will be added to the image.</param>
/// <returns>New image</returns>
public static async Task<byte[]> SetMetaDataAsync(byte[] OriginalImage, JpegMetaData MetaData)
{
// It seems thrown exceptions will be raised by this "async" ...
return await Task<byte[]>.Run(async () =>
{
return SetMetaData(OriginalImage, MetaData);
}).ConfigureAwait(false);
}
/// <summary>
/// Set exif data to Jpeg file; It blocks thread.
/// Mess of this library; everything are caused by crazy Exif format.
/// Note that this function overwrites ALL Exif data in the given image.
/// </summary>
/// <param name="OriginalImage">Target image</param>
/// <param name="MetaData">An Exif data which will be added to the image.</param>
/// <returns>New image</returns>
public static byte[] SetMetaData(byte[] OriginalImage, JpegMetaData MetaData)
{
var OriginalMetaData = JpegMetaDataParser.ParseImage(OriginalImage);
// Debug.WriteLine("Original image size: " + OriginalImage.Length.ToString("X"));
// It seems there's a bug handling little endian jpeg image on WP OS.
var OutputImageMetadataEndian = Definitions.Endian.Big;
var App0Offset = 0;
if (Util.GetUIntValue(OriginalImage, 2, 2, Definitions.Endian.Big) == Definitions.APP0_MARKER)
{
App0Offset = 2 + (int)Util.GetUIntValue(OriginalImage, 4, 2, Definitions.Endian.Big);
// Debug.WriteLine("APP0 marker detected. " + App0Offset);
}
// Note: App1 size and ID are fixed to Big endian.
UInt32 OriginalApp1DataSize = Util.GetUIntValue(OriginalImage, 4 + App0Offset, 2, Definitions.Endian.Big);
// Debug.WriteLine("Original App1 size: " + OriginalApp1DataSize.ToString("X"));
// 0-5 byte: Exif identify code. E, x, i, f, \0, \0
// 6-13 byte: TIFF header. endian, 0x002A, Offset to Primary IFD in 4 bytes. generally, 8 is set as the offset.
var OriginalApp1Data = new byte[OriginalApp1DataSize];
Array.Copy(OriginalImage, 6 + App0Offset, OriginalApp1Data, 0, (int)OriginalApp1DataSize);
var NewApp1Data = CreateApp1Data(OriginalMetaData, MetaData, OriginalApp1Data, OutputImageMetadataEndian);
// Only size of App1 data is different.
var NewImage = new byte[OriginalImage.Length - OriginalApp1DataSize + NewApp1Data.Length];
// Debug.WriteLine("New image size: " + NewImage.Length.ToString("X"));
// Copy SOI, App1 marker
var newImageHeader = new byte[4] { 0xFF, 0xD8, 0xFF, 0xE1 };
Array.Copy(newImageHeader, 0, NewImage, 0, 2 + 2);
// Important note again: App 1 data size is stored in Big endian.
var App1SizeData = Util.ToByte((UInt32)NewApp1Data.Length, 2, Definitions.Endian.Big);
Array.Copy(App1SizeData, 0, NewImage, 4, 2);
// After that, copy App1 data to new image.
Array.Copy(NewApp1Data, 0, NewImage, 6, NewApp1Data.Length);
// At last, copy body from original image.
Array.Copy(OriginalImage, 2 + 2 + 2 + App0Offset + (int)OriginalApp1DataSize, NewImage, 2 + 2 + 2 + NewApp1Data.Length, OriginalImage.Length - 2 - 2 - 2 - App0Offset - (int)OriginalApp1DataSize);
return NewImage;
}
/// <summary>
/// Set exif data to Jpeg file asynchronously.
/// Mess of this library; everything are caused by crazy Exif format.
/// Note that this function overwrites ALL Exif data in the given image.
/// </summary>
/// <param name="OriginalImage">Target image. This will be disposed.</param>
/// <param name="MetaData">An Exif data which will be added to the image.</param>
/// <returns>New image on new stream.</returns>
public static async Task<Stream> SetMetaDataAsync(Stream OriginalImage, JpegMetaData MetaData)
{
return await Task<Stream>.Run(async () =>
{
return SetMetaData(OriginalImage, MetaData);
}).ConfigureAwait(false);
}
/// <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;
}
/// <summary>
/// Set exif data to Jpeg file; It blocks thread.
/// Mess of this library; everything are caused by crazy Exif format.
/// Note that this function overwrites ALL Exif data in the given image.
/// </summary>
/// <param name="OriginalImage">Target image. This will be disposed.</param>
/// <param name="MetaData">An Exif data which will be added to the image.</param>
/// <returns>New image on new stream.</returns>
public static Stream SetMetaData(Stream OriginalImage, JpegMetaData MetaData)
{
OriginalImage.Seek(0, SeekOrigin.Begin);
var OriginalMetaData = JpegMetaDataParser.ParseImage(OriginalImage);
var OutputImageMetaDataEndian = Definitions.Endian.Big;
var endian = Definitions.Endian.Big;
OriginalImage.Position = 2;
var FirstMarker = new byte[2];
OriginalImage.Read(FirstMarker, 0, 2);
var App0Offset = 0;
if (Util.GetUIntValue(FirstMarker, 0, 2, endian) == Definitions.APP0_MARKER)
{
var App0SizeData = new byte[2];
OriginalImage.Read(App0SizeData, 0, 2);
App0Offset = 2 + (int)Util.GetUIntValue(App0SizeData, 0, 2, endian);
}
OriginalImage.Position = 4 + App0Offset;
var app1sizeData = new byte[2];
OriginalImage.Read(app1sizeData, 0, 2);
var OriginalApp1Size = Util.GetUIntValue(app1sizeData, 0, 2, endian);
OriginalImage.Position = 6 + App0Offset;
var OriginalApp1Data = new byte[OriginalApp1Size];
OriginalImage.Read(OriginalApp1Data, 0, (int)OriginalApp1Size);
var NewApp1Data = CreateApp1Data(OriginalMetaData, MetaData, OriginalApp1Data, OutputImageMetaDataEndian);
// first 6 bytes;
var NewImageHeader = new byte[6] { 0xFF, 0xD8, 0xFF, 0xE1, 0x0, 0x0 }; // No APP0 section will be stored on new image.
// Important note again: App 1 data size is stored in Big endian.
var App1SizeData = Util.ToByte((UInt32)NewApp1Data.Length, 2, Definitions.Endian.Big);
Array.Copy(App1SizeData, 0, NewImageHeader, 4, 2);
Util.DumpByteArrayAll(NewImageHeader);
var NewImage = new MemoryStream();
NewImage.Write(NewImageHeader, 0, 6);
NewImage.Write(NewApp1Data, 0, NewApp1Data.Length);
// forward pointer to start position of original body data
OriginalImage.Position = 6 + App0Offset + OriginalApp1Size;
// Copy all other data from original image.
int BufSize = 4096;
byte[] buffer = new byte[BufSize];
int numBytes;
int count = 0;
while ((numBytes = OriginalImage.Read(buffer, 0, BufSize)) > 0)
{
NewImage.Write(buffer, 0, numBytes);
count += numBytes;
}
NewImage.Seek(0, SeekOrigin.Begin);
// Debug.WriteLine("image size: " + NewImage.Length);
OriginalImage.Dispose();
return NewImage;
}
/// <summary>
/// Parse given data, App1 section data.
/// </summary>
/// <param name="App1Data">byte array of app1 data which starts from TIFF header.</param>
/// <returns>all meta data.</returns>
private static JpegMetaData ParseApp1Data(byte[] App1Data)
{
var exif = new JpegMetaData();
exif.App1Data = App1Data;
// Check TIFF header.
var MetaDataEndian = Definitions.Endian.Little;
if (Util.GetUIntValue(App1Data, 0, 2, Definitions.Endian.Little) == Definitions.TIFF_LITTLE_ENDIAN)
{
MetaDataEndian = Definitions.Endian.Little;
// Debug.WriteLine("This metadata in Little endian");
}
else if (Util.GetUIntValue(App1Data, 0, 2, Definitions.Endian.Little) == Definitions.TIFF_BIG_ENDIAN)
{
MetaDataEndian = Definitions.Endian.Big;
// Debug.WriteLine("This metadata in Big endian");
}
else
{
throw new UnsupportedFileFormatException("Currently, only little endian is supported.");
}
if (Util.GetUIntValue(App1Data, 2, 2, MetaDataEndian) != Definitions.TIFF_IDENTIFY_CODE)
{
throw new UnsupportedFileFormatException("TIFF identify code (0x2A00) couldn't find.");
}
// find out a pointer to 1st IFD
var PrimaryIfdPointer = Util.GetUIntValue(App1Data, 4, 4, MetaDataEndian);
// Debug.WriteLine("Primary IFD pointer: " + PrimaryIfdPointer);
// parse primary (0th) IFD section
exif.PrimaryIfd = Parser.IfdParser.ParseIfd(App1Data, PrimaryIfdPointer, MetaDataEndian);
// Debug.WriteLine("Primary offset: " + exif.PrimaryIfd.Offset + " length: " + exif.PrimaryIfd.Length + " next ifd: " + exif.PrimaryIfd.NextIfdPointer);
// parse Exif IFD section
if (exif.PrimaryIfd.Entries.ContainsKey(Definitions.EXIF_IFD_POINTER_TAG))
{
exif.ExifIfd = Parser.IfdParser.ParseIfd(App1Data, exif.PrimaryIfd.Entries[Definitions.EXIF_IFD_POINTER_TAG].UIntValues[0], MetaDataEndian);
// Debug.WriteLine("Exif offset: " + exif.ExifIfd.Offset + " length: " + exif.ExifIfd.Length);
}
// parse GPS data.
if (exif.PrimaryIfd.Entries.ContainsKey(Definitions.GPS_IFD_POINTER_TAG))
{
exif.GpsIfd = Parser.IfdParser.ParseIfd(App1Data, exif.PrimaryIfd.Entries[Definitions.GPS_IFD_POINTER_TAG].UIntValues[0], MetaDataEndian);
// Debug.WriteLine("GPS offset: " + exif.GpsIfd.Offset + " length: " + exif.GpsIfd.Length);
}
return exif;
}
public static void IsGpsDataAdded(JpegMetaData original, JpegMetaData added)
{
if (original.ExifIfd != null && added.ExifIfd != null)
{
TestUtil.AreEqual(original.ExifIfd, added.ExifIfd, "Exif IFD");
}
Assert.IsTrue(added.PrimaryIfd.Entries.ContainsKey(Definitions.GPS_IFD_POINTER_TAG));
Assert.IsNotNull(added.GpsIfd);
}
/// <summary>
/// Remove GPS information from metadata.
/// </summary>
/// <param name="meta">Metadata with geotag</param>
/// <returns></returns>
public static JpegMetaData RemoveGeoinfo(JpegMetaData meta)
{
if (meta.PrimaryIfd.Entries.ContainsKey(Definitions.GPS_IFD_POINTER_TAG))
{
meta.PrimaryIfd.Entries.Remove(Definitions.GPS_IFD_POINTER_TAG);
}
meta.GpsIfd = null;
return meta;
}