public virtual int ReadVInt()
{
// .NET Port: Going back to original code instead of Java code below due to sbyte/byte diff
/*byte b = ReadByte();
int i = b & 0x7F;
for (int shift = 7; (b & 0x80) != 0; shift += 7)
{
b = ReadByte();
i |= (b & 0x7F) << shift;
}
return i;*/
byte b = ReadByte();
if ((sbyte)b >= 0)
{
return b;
}
int i = b & 0x7F;
b = ReadByte();
i |= (b & 0x7F) << 7;
if ((sbyte)b >= 0)
{
return i;
}
b = ReadByte();
i |= (b & 0x7F) << 14;
if ((sbyte)b >= 0)
{
return i;
}
b = ReadByte();
i |= (b & 0x7F) << 21;
if ((sbyte)b >= 0)
{
return i;
}
b = ReadByte();
// Warning: the next ands use 0x0F / 0xF0 - beware copy/paste errors:
i |= (b & 0x0F) << 28;
if (((sbyte)b & 0xF0) == 0)
{
return i;
}
throw new System.IO.IOException("Invalid vInt detected (too many bits)");
}
/// <summary>
/// Restore a <seealso cref="ForUtil"/> from a <seealso cref="DataInput"/>.
/// </summary>
public ForUtil(DataInput @in)
{
int packedIntsVersion = @in.ReadVInt();
PackedInts.CheckVersion(packedIntsVersion);
EncodedSizes = new int[33];
Encoders = new PackedInts.Encoder[33];
Decoders = new PackedInts.Decoder[33];
Iterations = new int[33];
for (int bpv = 1; bpv <= 32; ++bpv)
{
int code = @in.ReadVInt();
int formatId = (int)((uint)code >> 5);
int bitsPerValue = (code & 31) + 1;
PackedInts.Format format = PackedInts.Format.ById(formatId);
Debug.Assert(format.IsSupported(bitsPerValue));
EncodedSizes[bpv] = EncodedSize(format, packedIntsVersion, bitsPerValue);
Encoders[bpv] = PackedInts.GetEncoder(format, packedIntsVersion, bitsPerValue);
Decoders[bpv] = PackedInts.GetDecoder(format, packedIntsVersion, bitsPerValue);
Iterations[bpv] = ComputeIterations(Decoders[bpv]);
}
}
