--- Log opened Wed Apr 29 00:00:06 2020
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06:56 < fiatjaf> ok, so here's a new dumb question: how will I know if the second byte is part of the first integer or the second integer?
06:56 < fiatjaf> or is that encoding in the level of bits and not bytes?
06:56 < fiatjaf> anyway the question remains
06:56 < fiatjaf> sorry, I'm not used to these low level thing
06:56 < fiatjaf> s
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08:17 < fiatjaf> I mean if there's a bitstring like 1111 is it T=3, L=3 or is it T=7, L=1?
08:17 < fiatjaf> what should I read to understand this?
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10:39 <@cdecker> fiatjaf: I'm not following, in which context are you trying to decode a bitstring?
10:39 <@cdecker> (got disconnected and lost my scrollback)
10:43 < fiatjaf> cdecker: trying to parse a TLV payload
10:43 < fiatjaf> each TLV record is supposed to be T:varint, L:varint, V
10:44 < fiatjaf> I'm trying to understand how can I know when T has ended and L has started
10:44 < fiatjaf> and when L ends and V starts
10:44 <@cdecker> Oh, I see, in that case you read the first byte, if it's below 252 you're done, if it's 253 you read two more bytes that are the real number, if it's 254 you read 4 bytes and that's the number, and if it's 255 you read 8 bytes and that's the number
10:45 <@cdecker> Your single nibble / 4 bits wasn't sufficient to decide that yet :-)
10:46 <@cdecker> And you do that for both T and L values. This for example is T=3 and L=7: 00000011 00000111
10:53 < fiatjaf> great, I should probably save that for the future, thank you very much
10:56 <@cdecker> (I hope I got the constants above right, but that's what I remember)
10:57 < fiatjaf> in the case of the 253 you ignore the first byte and the number is just the second and third bytes?
10:57 <@cdecker> Exactly
10:57 < fiatjaf> for all other cases the first byte is included
10:58 < fiatjaf> ?
11:00 < fiatjaf> (by the way, my bitstring example was just because I didn't know this minimal encoding was done at the level of bytes or bits)
11:00 <@cdecker> Nope, only in the < 252 case is the first byte taken into consideration, for all others it's just a signal on how big the encoding of the actual number is
11:01 < fiatjaf> ok, now it is maximally clear
11:01 < fiatjaf> thanks a lot
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11:03 <@cdecker> Anytime. It's heavily inspired by bitcoin's CompactSize, with the exception that we use big endian encoding for multi-byte ints :-)
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--- Log closed Thu Apr 30 00:00:08 2020