public void ShouldDecodeAHuffmanEncodedStringIfLengthAndPayloadAreInMultipleBuffers()
{
StringDecoder Decoder = new StringDecoder(1024, bufPool);
// Only put the prefix in the first byte
var buf = new Buffer();
buf.WriteByte(0xFF); // Prefix filled, non huffman, I = 127
var consumed = Decoder.Decode(buf.View);
Assert.False(Decoder.Done);
Assert.Equal(1, consumed);
// Remaining part of the length plus first content byte
buf = new Buffer();
buf.WriteByte(0x02); // I = 0x7F + 0x02 * 2^0 = 129 byte payload
buf.WriteByte(0xf9); // first byte of the payload
var expectedResult = "*";
consumed = Decoder.DecodeCont(buf.View);
Assert.False(Decoder.Done);
Assert.Equal(2, consumed);
// Half of other content bytes
buf = new Buffer();
for (var i = 0; i < 64; i = i + 2)
{
expectedResult += ")-";
buf.WriteByte(0xfe);
buf.WriteByte(0xd6);
}
consumed = Decoder.DecodeCont(buf.View);
Assert.False(Decoder.Done);
Assert.Equal(64, consumed);
// Last part of content bytes
buf = new Buffer();
for (var i = 0; i < 64; i = i + 2)
{
expectedResult += "0+";
buf.WriteByte(0x07);
buf.WriteByte(0xfb);
}
consumed = Decoder.DecodeCont(buf.View);
Assert.True(Decoder.Done);
Assert.Equal(expectedResult, Decoder.Result);
Assert.Equal(129, Decoder.StringLength);
Assert.Equal(64, consumed);
}
public void ShouldDecodeAnASCIIStringIfPayloadIsInMultipleBuffers()
{
StringDecoder Decoder = new StringDecoder(1024, bufPool);
// Only put the prefix in the first byte
var buf = new Buffer();
buf.WriteByte(0x04); // 4 Characters, non huffman
var consumed = Decoder.Decode(buf.View);
Assert.False(Decoder.Done);
Assert.Equal(1, consumed);
// Next chunk with part of data
buf = new Buffer();
buf.WriteByte('a');
buf.WriteByte('s');
consumed = Decoder.DecodeCont(buf.View);
Assert.False(Decoder.Done);
Assert.Equal(2, consumed);
// Give the thing a depleted buffer
consumed = Decoder.DecodeCont(new ArraySegment <byte>(buf.Bytes, 2, 0));
Assert.False(Decoder.Done);
Assert.Equal(0, consumed);
// Final chunk
buf = new Buffer();
buf.WriteByte('d');
buf.WriteByte('f');
consumed = Decoder.DecodeCont(buf.View);
Assert.True(Decoder.Done);
Assert.Equal("asdf", Decoder.Result);
Assert.Equal(4, Decoder.StringLength);
Assert.Equal(2, consumed);
}
public void ShouldCheckTheMaximumStringLength()
{
StringDecoder Decoder = new StringDecoder(2, bufPool);
// 2 Characters are ok
var buf = new Buffer();
buf.WriteByte(0x02);
buf.WriteByte('a');
buf.WriteByte('b');
var consumed = Decoder.Decode(buf.View);
Assert.True(Decoder.Done);
Assert.Equal("ab", Decoder.Result);
Assert.Equal(2, Decoder.StringLength);
Assert.Equal(3, consumed);
// 3 should fail
buf = new Buffer();
buf.WriteByte(0x03);
buf.WriteByte('a');
buf.WriteByte('b');
buf.WriteByte('c');
var ex = Assert.Throws <Exception>(() => Decoder.Decode(buf.View));
Assert.Equal("Maximum string length exceeded", ex.Message);
// Things were the length is stored in a continuation byte should also fail
buf = new Buffer();
buf.WriteByte(0x7F); // More than 127 bytes
consumed = Decoder.Decode(buf.View);
Assert.False(Decoder.Done);
Assert.Equal(1, consumed);
buf.WriteByte(1);
var view = new ArraySegment <byte>(buf.Bytes, 1, 1);
ex = Assert.Throws <Exception>(() => Decoder.DecodeCont(view));
Assert.Equal("Maximum string length exceeded", ex.Message);
}