public static bool UnpackString(ReadBuffer rb, ref string value)
{
byte t = rb.MoveNext();
if (t == 0xc0)
{
value = null;
return(true);
}
if (t > 0x9f && t < 0xc0)
{
int slen = t & 0x1f;
if (rb.Left() < slen)
{
Console.WriteLine("UnpackString fixed str failed");
return(false);
}
value = rb.CopyString(slen);
rb.MoveOffset(slen);
return(true);
}
switch (t)
{
case 0xd9: // str8
{
if (rb.Left() < 1)
{
Console.WriteLine("UnpackString str8 length failed");
return(false);
}
byte slen = rb.MoveNext();
if (rb.Left() < slen)
{
Console.WriteLine("UnpackString str8 failed");
return(false);
}
value = rb.CopyString(slen);
rb.MoveOffset(slen);
break;
}
case 0xda: // str16
{
ushort slen = 0;
if (rb.Left() < 2)
{
Console.WriteLine("UnpackString str16 length failed");
return(false);
}
ReadNumber(rb.Data(), rb.Offset(), ref slen);
rb.MoveOffset(2);
if (rb.Left() < slen)
{
Console.WriteLine("UnpackString str16 failed");
return(false);
}
value = rb.CopyString(slen);
rb.MoveOffset(slen);
break;
}
case 0xdb: // str32
{
uint slen = 0;
if (rb.Left() < 4)
{
Console.WriteLine("UnpackString str32 length failed");
return(false);
}
ReadNumber(rb.Data(), rb.Offset(), ref slen);
rb.MoveOffset(4);
if (rb.Left() < slen)
{
Console.WriteLine("UnpackString str32 failed");
return(false);
}
value = rb.CopyString((int)slen);
rb.MoveOffset((int)slen);
break;
}
default:
{
Console.WriteLine("UnpackString unknown type " + t.ToString());
return(false);
}
}
return(true);
}