private ExifValue CreateValue(ExifTagValue tag, ExifDataType dataType, uint numberOfComponents)
{
if (!_reader.CanRead(numberOfComponents))
{
return(null);
}
var exifValue = ExifValues.Create(tag);
if (exifValue == null)
{
exifValue = ExifValues.Create(tag, dataType, numberOfComponents);
}
if (exifValue == null)
{
return(null);
}
var value = ReadValue(dataType, numberOfComponents);
if (!exifValue.SetValue(value))
{
return(null);
}
return(exifValue);
}
private static IExifValue GetOffsetValue(Collection <IExifValue> ifdValues, Collection <IExifValue> values, ExifTag offsetTag)
{
var index = -1;
for (var i = 0; i < ifdValues.Count; i++)
{
if (ifdValues[i].Tag == offsetTag)
{
index = i;
}
}
if (values.Count > 0)
{
if (index != -1)
{
return(ifdValues[index]);
}
var result = ExifValues.Create(offsetTag);
ifdValues.Add(result);
return(result);
}
else if (index != -1)
{
ifdValues.RemoveAt(index);
}
return(null);
}
/// <summary>
/// Sets the value of the specified tag.
/// </summary>
/// <param name="tag">The tag of the exif value.</param>
/// <param name="value">The value.</param>
public void SetValue(ExifTag tag, object value)
{
foreach (var exifValue in Values)
{
if (exifValue.Tag == tag)
{
exifValue.Value = value;
return;
}
}
var newExifValue = ExifValues.Create(tag, value);
_values.Add(newExifValue);
}
/// <summary>
/// Sets the value of the specified tag.
/// </summary>
/// <param name="tag">The tag of the exif value.</param>
/// <param name="value">The value.</param>
/// <typeparam name="TValueType">The data type of the tag.</typeparam>
public void SetValue <TValueType>(ExifTag <TValueType> tag, TValueType value)
{
foreach (var exifValue in Values)
{
if (exifValue.Tag == tag)
{
exifValue.SetValue(value);
return;
}
}
var newExifValue = ExifValues.Create(tag);
if (newExifValue == null)
{
throw new NotSupportedException();
}
newExifValue.SetValue(value);
_values.Add(newExifValue);
}
/// <summary>
/// Sets the value of the specified tag.
/// </summary>
/// <param name="tag">The tag of the exif value.</param>
/// <param name="value">The value.</param>
/// <typeparam name="TValueType">The data type of the tag.</typeparam>
public void SetValue <TValueType>(ExifTag <TValueType> tag, TValueType value)
{
Throw.IfNull(nameof(value), value);
InitializeValues();
foreach (var exifValue in _data.Values)
{
if (exifValue.Tag == tag)
{
exifValue.SetValue(value);
return;
}
}
var newExifValue = ExifValues.Create(tag);
if (newExifValue == null)
{
throw new NotSupportedException();
}
newExifValue.SetValue(value);
_data.Values.Add(newExifValue);
}