/// <summary>
/// Performs the Jfif data extraction, adding found values to the specified
/// instance of
/// <see cref="Com.Drew.Metadata.Metadata"/>
/// .
/// </summary>
public virtual void Extract([NotNull] RandomAccessReader reader, [NotNull] Com.Drew.Metadata.Metadata metadata)
{
JfifDirectory directory = new JfifDirectory();
metadata.AddDirectory(directory);
try
{
// For JFIF, the tag number is also the offset into the segment
int ver = reader.GetUInt16(JfifDirectory.TagVersion);
directory.SetInt(JfifDirectory.TagVersion, ver);
int units = reader.GetUInt8(JfifDirectory.TagUnits);
directory.SetInt(JfifDirectory.TagUnits, units);
int height = reader.GetUInt16(JfifDirectory.TagResx);
directory.SetInt(JfifDirectory.TagResx, height);
int width = reader.GetUInt16(JfifDirectory.TagResy);
directory.SetInt(JfifDirectory.TagResy, width);
}
catch (IOException me)
{
directory.AddError(me.Message);
}
}
/// <summary>
/// Performs the Jfif data extraction, adding found values to the specified
/// instance of
/// <see cref="Com.Drew.Metadata.Metadata"/>
/// .
/// </summary>
public virtual void Extract(RandomAccessReader reader, Com.Drew.Metadata.Metadata metadata)
{
JfifDirectory directory = metadata.GetOrCreateDirectory <JfifDirectory>();
try
{
// For JFIF, the tag number is also the offset into the segment
int ver = reader.GetUInt16(JfifDirectory.TagVersion);
directory.SetInt(JfifDirectory.TagVersion, ver);
int units = reader.GetUInt8(JfifDirectory.TagUnits);
directory.SetInt(JfifDirectory.TagUnits, units);
int height = reader.GetUInt16(JfifDirectory.TagResx);
directory.SetInt(JfifDirectory.TagResx, height);
int width = reader.GetUInt16(JfifDirectory.TagResy);
directory.SetInt(JfifDirectory.TagResy, width);
}
catch (IOException me)
{
directory.AddError(me.Message);
}
}
public virtual void TestRead()
{
sbyte[] jfifData = new sbyte[] { 74, 70, 73, 70, 0, 1, 2, 1, 0, 108, 0, 108, 0, 0 };
Com.Drew.Metadata.Metadata metadata = new Com.Drew.Metadata.Metadata();
JfifReader reader = new JfifReader();
reader.Extract(new ByteArrayReader(jfifData), metadata);
Sharpen.Tests.AreEqual(1, metadata.GetDirectoryCount());
JfifDirectory directory = metadata.GetFirstDirectoryOfType <JfifDirectory>();
NUnit.Framework.Assert.IsNotNull(directory);
Sharpen.Tests.IsFalse(Sharpen.Extensions.ConvertToString(directory.GetErrors()), directory.HasErrors());
Tag[] tags = Sharpen.Collections.ToArray(directory.GetTags(), new Tag[directory.GetTagCount()]);
Sharpen.Tests.AreEqual(4, tags.Length);
Sharpen.Tests.AreEqual(JfifDirectory.TagVersion, tags[0].GetTagType());
Sharpen.Tests.AreEqual(unchecked ((int)(0x0102)), directory.GetInt(tags[0].GetTagType()));
Sharpen.Tests.AreEqual(JfifDirectory.TagUnits, tags[1].GetTagType());
Sharpen.Tests.AreEqual(1, directory.GetInt(tags[1].GetTagType()));
Sharpen.Tests.AreEqual(JfifDirectory.TagResx, tags[2].GetTagType());
Sharpen.Tests.AreEqual(108, directory.GetInt(tags[2].GetTagType()));
Sharpen.Tests.AreEqual(JfifDirectory.TagResy, tags[3].GetTagType());
Sharpen.Tests.AreEqual(108, directory.GetInt(tags[3].GetTagType()));
}