public virtual void TestSegmentWithMultipleOccurrences()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker = unchecked((sbyte)12);
sbyte[] segmentBytes1 = new sbyte[] { 1, 2, 3 };
sbyte[] segmentBytes2 = new sbyte[] { 3, 2, 1 };
segmentData.AddSegment(segmentMarker, segmentBytes1);
segmentData.AddSegment(segmentMarker, segmentBytes2);
Sharpen.Tests.AreEqual(2, segmentData.GetSegmentCount(segmentMarker));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes1, segmentData.GetSegment(segmentMarker));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes1, segmentData.GetSegment(segmentMarker, 0));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes2, segmentData.GetSegment(segmentMarker, 1));
}
public virtual void TestAddingMultipleSegments()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker1 = unchecked((sbyte)12);
sbyte segmentMarker2 = unchecked((sbyte)21);
sbyte[] segmentBytes1 = new sbyte[] { 1, 2, 3 };
sbyte[] segmentBytes2 = new sbyte[] { 3, 2, 1 };
segmentData.AddSegment(segmentMarker1, segmentBytes1);
segmentData.AddSegment(segmentMarker2, segmentBytes2);
Sharpen.Tests.AreEqual(1, segmentData.GetSegmentCount(segmentMarker1));
Sharpen.Tests.AreEqual(1, segmentData.GetSegmentCount(segmentMarker2));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes1, segmentData.GetSegment(segmentMarker1));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes2, segmentData.GetSegment(segmentMarker2));
}
public virtual void TestRemoveSegmentOccurrence()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker = unchecked ((sbyte)12);
sbyte[] segmentBytes1 = new sbyte[] { 1, 2, 3 };
sbyte[] segmentBytes2 = new sbyte[] { 3, 2, 1 };
segmentData.AddSegment(segmentMarker, segmentBytes1);
segmentData.AddSegment(segmentMarker, segmentBytes2);
Sharpen.Tests.AreEqual(2, segmentData.GetSegmentCount(segmentMarker));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes1, segmentData.GetSegment(segmentMarker, 0));
segmentData.RemoveSegmentOccurrence(segmentMarker, 0);
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes2, segmentData.GetSegment(segmentMarker, 0));
}
public virtual void TestRemoveSegment()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker = unchecked((sbyte)12);
sbyte[] segmentBytes1 = new sbyte[] { 1, 2, 3 };
sbyte[] segmentBytes2 = new sbyte[] { 3, 2, 1 };
segmentData.AddSegment(segmentMarker, segmentBytes1);
segmentData.AddSegment(segmentMarker, segmentBytes2);
Sharpen.Tests.AreEqual(2, segmentData.GetSegmentCount(segmentMarker));
Sharpen.Tests.IsTrue(segmentData.ContainsSegment(segmentMarker));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes1, segmentData.GetSegment(segmentMarker, 0));
segmentData.RemoveSegment(segmentMarker);
Sharpen.Tests.IsTrue(!segmentData.ContainsSegment(segmentMarker));
Sharpen.Tests.AreEqual(0, segmentData.GetSegmentCount(segmentMarker));
}
public virtual void TestAddingMultipleSegments()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker1 = unchecked ((sbyte)12);
sbyte segmentMarker2 = unchecked ((sbyte)21);
sbyte[] segmentBytes1 = new sbyte[] { 1, 2, 3 };
sbyte[] segmentBytes2 = new sbyte[] { 3, 2, 1 };
segmentData.AddSegment(segmentMarker1, segmentBytes1);
segmentData.AddSegment(segmentMarker2, segmentBytes2);
Sharpen.Tests.AreEqual(1, segmentData.GetSegmentCount(segmentMarker1));
Sharpen.Tests.AreEqual(1, segmentData.GetSegmentCount(segmentMarker2));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes1, segmentData.GetSegment(segmentMarker1));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes2, segmentData.GetSegment(segmentMarker2));
}
public virtual void TestContainsSegment()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker = unchecked((sbyte)12);
sbyte[] segmentBytes = new sbyte[] { 1, 2, 3 };
Sharpen.Tests.IsTrue(!segmentData.ContainsSegment(segmentMarker));
segmentData.AddSegment(segmentMarker, segmentBytes);
Sharpen.Tests.IsTrue(segmentData.ContainsSegment(segmentMarker));
}
public virtual void TestAddAndGetSegment()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker = unchecked((sbyte)12);
sbyte[] segmentBytes = new sbyte[] { 1, 2, 3 };
segmentData.AddSegment(segmentMarker, segmentBytes);
Sharpen.Tests.AreEqual(1, segmentData.GetSegmentCount(segmentMarker));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes, segmentData.GetSegment(segmentMarker));
}
public virtual void TestContainsSegment()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker = unchecked ((sbyte)12);
sbyte[] segmentBytes = new sbyte[] { 1, 2, 3 };
Sharpen.Tests.IsTrue(!segmentData.ContainsSegment(segmentMarker));
segmentData.AddSegment(segmentMarker, segmentBytes);
Sharpen.Tests.IsTrue(segmentData.ContainsSegment(segmentMarker));
}
public virtual void TestAddAndGetSegment()
{
JpegSegmentData segmentData = new JpegSegmentData();
sbyte segmentMarker = unchecked ((sbyte)12);
sbyte[] segmentBytes = new sbyte[] { 1, 2, 3 };
segmentData.AddSegment(segmentMarker, segmentBytes);
Sharpen.Tests.AreEqual(1, segmentData.GetSegmentCount(segmentMarker));
NUnit.Framework.CollectionAssert.AreEqual(segmentBytes, segmentData.GetSegment(segmentMarker));
}
public static JpegSegmentData ReadSegments([NotNull] SequentialReader reader, [CanBeNull] Iterable <JpegSegmentType> segmentTypes)
{
// Must be big-endian
System.Diagnostics.Debug.Assert((reader.IsMotorolaByteOrder()));
// first two bytes should be JPEG magic number
int magicNumber = reader.GetUInt16();
if (magicNumber != unchecked ((int)(0xFFD8)))
{
throw new JpegProcessingException("JPEG data is expected to begin with 0xFFD8 (ÿØ) not 0x" + Sharpen.Extensions.ToHexString(magicNumber));
}
ICollection <sbyte> segmentTypeBytes = null;
if (segmentTypes != null)
{
segmentTypeBytes = new HashSet <sbyte>();
foreach (JpegSegmentType segmentType in segmentTypes)
{
segmentTypeBytes.Add(segmentType.byteValue);
}
}
JpegSegmentData segmentData = new JpegSegmentData();
do
{
// Find the segment marker. Markers are zero or more 0xFF bytes, followed
// by a 0xFF and then a byte not equal to 0x00 or 0xFF.
short segmentIdentifier = reader.GetUInt8();
// We must have at least one 0xFF byte
if (segmentIdentifier != unchecked ((int)(0xFF)))
{
throw new JpegProcessingException("Expected JPEG segment start identifier 0xFF, not 0x" + Sharpen.Extensions.ToHexString(segmentIdentifier).ToUpper());
}
// Read until we have a non-0xFF byte. This identifies the segment type.
sbyte segmentType = reader.GetInt8();
while (segmentType == unchecked ((sbyte)0xFF))
{
segmentType = reader.GetInt8();
}
if (segmentType == 0)
{
throw new JpegProcessingException("Expected non-zero byte as part of JPEG marker identifier");
}
if (segmentType == SegmentSos)
{
// The 'Start-Of-Scan' segment's length doesn't include the image data, instead would
// have to search for the two bytes: 0xFF 0xD9 (EOI).
// It comes last so simply return at this point
return(segmentData);
}
if (segmentType == MarkerEoi)
{
// the 'End-Of-Image' segment -- this should never be found in this fashion
return(segmentData);
}
// next 2-bytes are <segment-size>: [high-byte] [low-byte]
int segmentLength = reader.GetUInt16();
// segment length includes size bytes, so subtract two
segmentLength -= 2;
if (segmentLength < 0)
{
throw new JpegProcessingException("JPEG segment size would be less than zero");
}
// Check whether we are interested in this segment
if (segmentTypeBytes == null || segmentTypeBytes.Contains(segmentType))
{
sbyte[] segmentBytes = reader.GetBytes(segmentLength);
System.Diagnostics.Debug.Assert((segmentLength == segmentBytes.Length));
segmentData.AddSegment(segmentType, segmentBytes);
}
else
{
// Some if the JPEG is truncated, just return what data we've already gathered
if (!reader.TrySkip(segmentLength))
{
return(segmentData);
}
}
}while (true);
}
public static JpegSegmentData ReadSegments([NotNull] SequentialReader reader, [CanBeNull] Iterable<JpegSegmentType> segmentTypes)
{
// Must be big-endian
System.Diagnostics.Debug.Assert((reader.IsMotorolaByteOrder()));
// first two bytes should be JPEG magic number
int magicNumber = reader.GetUInt16();
if (magicNumber != unchecked((int)(0xFFD8)))
{
throw new JpegProcessingException("JPEG data is expected to begin with 0xFFD8 (ÿØ) not 0x" + Sharpen.Extensions.ToHexString(magicNumber));
}
ICollection<sbyte> segmentTypeBytes = null;
if (segmentTypes != null)
{
segmentTypeBytes = new HashSet<sbyte>();
foreach (JpegSegmentType segmentType in segmentTypes)
{
segmentTypeBytes.Add(segmentType.byteValue);
}
}
JpegSegmentData segmentData = new JpegSegmentData();
do
{
// Find the segment marker. Markers are zero or more 0xFF bytes, followed
// by a 0xFF and then a byte not equal to 0x00 or 0xFF.
short segmentIdentifier = reader.GetUInt8();
// We must have at least one 0xFF byte
if (segmentIdentifier != unchecked((int)(0xFF)))
{
throw new JpegProcessingException("Expected JPEG segment start identifier 0xFF, not 0x" + Sharpen.Extensions.ToHexString(segmentIdentifier).ToUpper());
}
// Read until we have a non-0xFF byte. This identifies the segment type.
sbyte segmentType = reader.GetInt8();
while (segmentType == unchecked((sbyte)0xFF))
{
segmentType = reader.GetInt8();
}
if (segmentType == 0)
{
throw new JpegProcessingException("Expected non-zero byte as part of JPEG marker identifier");
}
if (segmentType == SegmentSos)
{
// The 'Start-Of-Scan' segment's length doesn't include the image data, instead would
// have to search for the two bytes: 0xFF 0xD9 (EOI).
// It comes last so simply return at this point
return segmentData;
}
if (segmentType == MarkerEoi)
{
// the 'End-Of-Image' segment -- this should never be found in this fashion
return segmentData;
}
// next 2-bytes are <segment-size>: [high-byte] [low-byte]
int segmentLength = reader.GetUInt16();
// segment length includes size bytes, so subtract two
segmentLength -= 2;
if (segmentLength < 0)
{
throw new JpegProcessingException("JPEG segment size would be less than zero");
}
// Check whether we are interested in this segment
if (segmentTypeBytes == null || segmentTypeBytes.Contains(segmentType))
{
sbyte[] segmentBytes = reader.GetBytes(segmentLength);
System.Diagnostics.Debug.Assert((segmentLength == segmentBytes.Length));
segmentData.AddSegment(segmentType, segmentBytes);
}
else
{
// Some if the JPEG is truncated, just return what data we've already gathered
if (!reader.TrySkip(segmentLength))
{
return segmentData;
}
}
}
while (true);
}
