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nip45: a mike dilger fix and a change inspired by a mike dilger fix.

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fiatjaf 2024-11-11 22:12:37 -03:00
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45.md
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@ -43,11 +43,11 @@ This is so it enables merging results from multiple relays and yielding a reason
This section describes the steps a relay should take in order to return HLL values to clients. This section describes the steps a relay should take in order to return HLL values to clients.
1. Upon receiving a filter, if it has a single `#e`, `#p`, `#a` or `#q` item, read its 32th ascii character as a byte and take its modulo over 24 to obtain an `offset` -- in the unlikely case that the filter doesn't meet these conditions, set `offset` to the number 16; 1. Upon receiving a filter, if it has a single `#e`, `#p`, `#a` or `#q` item, read its 32th ascii character as a nibble (a half-byte, a number between 0 and 16) and add `8` to it to obtain an `offset` -- in the unlikely case that the filter doesn't meet these conditions, set `offset` to the number `16`;
2. Initialize 256 registers to 0 for the HLL value; 2. Initialize 256 registers to `0` for the HLL value;
3. For all the events that are to be counted according to the filter, do this: 3. For all the events that are to be counted according to the filter, do this:
1. Read byte at position `offset` of the event `pubkey`, its value will be the register index `ri`; 1. Read byte at position `offset` of the event `pubkey`, its value will be the register index `ri`;
2. Count the number of leading zero bits starting at position `offset+1` of the event `pubkey`; 2. Count the number of leading zero bits starting at position `offset+1` of the event `pubkey` and add `1`;
3. Compare that with the value stored at register `ri`, if the new number is bigger, store it. 3. Compare that with the value stored at register `ri`, if the new number is bigger, store it.
That is all that has to be done on the relay side, and therefore the only part needed for interoperability. That is all that has to be done on the relay side, and therefore the only part needed for interoperability.