public void ReadNext_SegmentWithData()
{
var input = new BinaryReader(new MemoryStream(new byte[]
{
0xFF, 0xD8, // start of input
0xFF, 0xE1, 0x00, 0x06, 0x12, 0x34, 0x56, 0x78, // app1 block
0xFF, 0xDA, // start of scan
0xAB, 0xCD, 0xEF // ... image data
}));
var reader = new JpegSegmentReader(input);
var segment = reader.ReadSegment();
Assert.AreEqual(JpegSegmentType.Soi, segment.Type);
Assert.AreEqual(2, segment.Offset);
Assert.AreEqual(0, segment.Bytes.Length);
segment = reader.ReadSegment();
Assert.AreEqual(JpegSegmentType.App1, segment.Type);
Assert.AreEqual(6, segment.Offset);
Assert.AreEqual(4, segment.Bytes.Length);
Assert.AreEqual(0x12, segment.Bytes[0]);
Assert.AreEqual(0x34, segment.Bytes[1]);
Assert.AreEqual(0x56, segment.Bytes[2]);
Assert.AreEqual(0x78, segment.Bytes[3]);
segment = reader.ReadSegment();
Assert.AreEqual(JpegSegmentType.Sos, segment.Type);
Assert.AreEqual(12, segment.Offset);
Assert.AreEqual(0, segment.Bytes.Length);
segment = reader.ReadSegment();
Assert.IsNull(segment);
}
public void ReadNext_DetectInvalidHeaderTypeAtTheBeginning()
{
var input = new BinaryReader(new MemoryStream(new byte[] { 0xFF, 0x00 }));
var reader = new JpegSegmentReader(input);
reader.ReadSegment();
}
public void ReadNext_DetectInvalidSegmentHeader()
{
var input = new BinaryReader(new MemoryStream(new byte[] { 0xCC }));
var reader = new JpegSegmentReader(input);
reader.ReadSegment();
}
public void ReadNext_EmptyFile()
{
var input = new BinaryReader(new MemoryStream(new byte[0]));
var reader = new JpegSegmentReader(input);
Assert.IsNull(reader.ReadSegment());
Assert.IsNull(reader.ReadSegment());
}
public void ReadNext_UnexpectedEndOfInputInSegmentData()
{
var input = new BinaryReader(new MemoryStream(new byte[]
{
0xFF, 0xD8, // start of input
0xFF, 0xE1, 0x00, 0x03,
}));
var reader = new JpegSegmentReader(input);
reader.ReadSegment(); // start of input
reader.ReadSegment();
}
public void ReadNext_SegmentWithoutData()
{
var input = new BinaryReader(new MemoryStream(new byte[]
{
0xFF, 0xD8, // start of input
0xFF, 0xDA, // start of scan
0xAB, 0xCD, 0xEF // ... image data
}));
var reader = new JpegSegmentReader(input);
var segment = reader.ReadSegment();
Assert.AreEqual(JpegSegmentType.Soi, segment.Type);
Assert.AreEqual(2, segment.Offset);
Assert.AreEqual(0, segment.Bytes.Length);
segment = reader.ReadSegment();
Assert.AreEqual(JpegSegmentType.Sos, segment.Type);
Assert.AreEqual(4, segment.Offset);
Assert.AreEqual(0, segment.Bytes.Length);
segment = reader.ReadSegment();
Assert.IsNull(segment);
}
