public override FdbTuple <T1, T2> DecodeComposite(Slice encoded, int count)
{
Contract.Requires(count > 0);
var reader = new SliceReader(encoded);
T1 key1 = default(T1);
T2 key2 = default(T2);
if (count >= 1)
{
key1 = m_codec1.DecodeOrderedSelfTerm(ref reader);
}
if (count >= 2)
{
key2 = m_codec2.DecodeOrderedSelfTerm(ref reader);
}
if (reader.HasMore)
{
throw new InvalidOperationException(String.Format("Unexpected data at the end of composite key after {0} items", count));
}
return(FdbTuple.Create <T1, T2>(key1, key2));
}
public void Test_Simple_SelfTerms_Codecs()
{
// encodes a key using 3 parts: (x, y, z) => ordered_key
string x = "abc";
long y = 123;
Guid z = Guid.NewGuid();
var first = FdbTupleCodec<string>.Default;
var second = FdbTupleCodec<long>.Default;
var third = FdbTupleCodec<Guid>.Default;
var writer = SliceWriter.Empty;
first.EncodeOrderedSelfTerm(ref writer, x);
second.EncodeOrderedSelfTerm(ref writer, y);
third.EncodeOrderedSelfTerm(ref writer, z);
var data = writer.ToSlice();
Assert.That(data, Is.EqualTo(FdbTuple.EncodeKey(x, y, z)));
var reader = new SliceReader(data);
Assert.That(first.DecodeOrderedSelfTerm(ref reader), Is.EqualTo(x));
Assert.That(second.DecodeOrderedSelfTerm(ref reader), Is.EqualTo(y));
Assert.That(third.DecodeOrderedSelfTerm(ref reader), Is.EqualTo(z));
Assert.That(reader.HasMore, Is.False);
}
/// <summary>Outputs a debug version of a compressed segment</summary>
public static StringBuilder DumpCompressed(Slice compressed, StringBuilder output = null)
{
if (output == null) output = new StringBuilder();
if (compressed.Count == 0)
{
output.Append("Empty bitmap [0 bytes]");
return output;
}
var reader = new SliceReader(compressed);
output.Append(String.Format("Compressed [{0} bytes]:", compressed.Count));
uint header = reader.ReadFixed32();
int highestBit = (int)header;
output.Append(String.Format(" {0} words", (compressed.Count >> 2) - 1));
uint p = 0;
int i = 0;
while(reader.Remaining >= 4)
{
uint word = reader.ReadFixed32();
if ((word & TYPE_MASK) == BIT_TYPE_LITERAL)
{
output.AppendFormat(", ({0}:{1}) 0x{2:X8}", i, p, word);
p += 31;
}
else
{
uint len = (word & LENGTH_MASK) + 1;
output.AppendFormat(", ({0}:{1}) {2} x {3}", i, p, ((word & FILL_MASK) >> FILL_SHIFT) == 0 ? "zero" : "one", len);
p += len * 31;
}
i++;
}
output.Append(", MSB ").Append(highestBit);
if (reader.Remaining > 0)
{
output.AppendLine(String.Format(", ERROR: {0} trailing byte(s)", reader.Remaining));
}
return output;
}
public virtual T DecodeUnordered(Slice input)
{
var reader = new SliceReader(input);
return(DecodeUnorderedSelfTerm(ref reader));
}
private static void CheckVersion(Slice value, bool writeAccess)
{
// the version is stored as 3 x 32-bit unsigned ints, so (1, 0, 0) will be "<01><00><00><00> <00><00><00><00> <00><00><00><00>"
var reader = new SliceReader(value);
var major = reader.ReadFixed32();
var minor = reader.ReadFixed32();
var upgrade = reader.ReadFixed32();
if (major > LayerVersion.Major) throw new InvalidOperationException(String.Format("Cannot load directory with version {0}.{1}.{2} using directory layer {3}", major, minor, upgrade, LayerVersion));
if (writeAccess && minor > LayerVersion.Minor) throw new InvalidOperationException(String.Format("Directory with version {0}.{1}.{2} is read-only when opened using directory layer {3}", major, minor, upgrade, LayerVersion));
}
public virtual T DecodeUnorderedSelfTerm(ref SliceReader input)
{
return(DecodeOrderedSelfTerm(ref input));
}
public abstract T DecodeOrderedSelfTerm(ref SliceReader input);
public TupleReader(SliceReader input)
{
this.Input = input;
this.Depth = 0;
}
public TupleReader(Slice buffer)
{
this.Input = new SliceReader(buffer);
this.Depth = 0;
}
/// <summary>Decode the next token from a packed tuple</summary>
/// <param name="reader">Parser from wich to read the next token</param>
/// <returns>Token decoded, or Slice.Nil if there was no more data in the buffer</returns>
public static Slice ParseNext(ref SliceReader reader)
{
int type = reader.PeekByte();
switch (type)
{
case -1:
{ // End of Stream
return Slice.Nil;
}
case FdbTupleTypes.Nil:
{ // <00> => null
reader.Skip(1);
return Slice.Empty;
}
case FdbTupleTypes.Bytes:
{ // <01>(bytes)<00>
return reader.ReadByteString();
}
case FdbTupleTypes.Utf8:
{ // <02>(utf8 bytes)<00>
return reader.ReadByteString();
}
case FdbTupleTypes.Single:
{ // <20>(4 bytes)
return reader.ReadBytes(5);
}
case FdbTupleTypes.Double:
{ // <21>(8 bytes)
return reader.ReadBytes(9);
}
case FdbTupleTypes.Uuid128:
{ // <30>(16 bytes)
return reader.ReadBytes(17);
}
case FdbTupleTypes.Uuid64:
{ // <31>(8 bytes)
return reader.ReadBytes(9);
}
case FdbTupleTypes.AliasDirectory:
case FdbTupleTypes.AliasSystem:
{ // <FE> or <FF>
return reader.ReadBytes(1);
}
}
if (type <= FdbTupleTypes.IntPos8 && type >= FdbTupleTypes.IntNeg8)
{
int bytes = type - FdbTupleTypes.IntZero;
if (bytes < 0) bytes = -bytes;
return reader.ReadBytes(1 + bytes);
}
throw new FormatException(String.Format("Invalid tuple type byte {0} at index {1}/{2}", type, reader.Position, reader.Buffer.Count));
}
