// it could only distinguish unsigned varint32 and varint8
public static byte[] ToVarint(uint value, VarintType type)
{
if (type == VarintType.Varint8)
{
return(VarintBitConverter.GetVarintBytes((byte)value));
}
else
{
return(VarintBitConverter.GetVarintBytes(value));
}
}
// it could only distinguish unsigned varint32 and varint8
public static (byte[], VarintType) ToVarint(uint value)
{
if (value < 0x80)
{
return(VarintBitConverter.GetVarintBytes((byte)value), VarintType.Varint8);
}
else
{
return(VarintBitConverter.GetVarintBytes(value), VarintType.Varint32);
}
}
public static int GetVarintSize(uint number)
{
(byte[] _, VarintType type) = VarintBitConverter.ToVarint(number);
if (type == VarintType.Varint8)
{
return(1);
}
else if (type == VarintType.Varint32)
{
return(4);
}
else
{
throw new Exception($"Varint type {type} does not exist");
}
}
// it could only distinguish unsigned varint32 and varint8
public static (uint, VarintType) FromVarint(byte[] data, int startIndex)
{
VarintType type;
uint value;
// most significant bit is 1
if ((data[startIndex] & 0x80) != 0)
{
type = VarintType.Varint32;
value = VarintBitConverter.ToUInt32(data, startIndex);
}
// most significant bit is 0
else
{
type = VarintType.Varint8;
value = data[startIndex];
}
return(value, type);
}