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Clarify that the presence of a value with weight 1 is required

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elasota 2023-11-08 23:25:00 -05:00 • committed by Nick Terrell
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doc/zstd_compression_format.md
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@ -1252,7 +1252,7 @@ Number_of_Bits = Weight ? (Max_Number_of_Bits + 1 - Weight) : 0
```
When a literal value is not present, it receives a `Weight` of 0.
The least frequent symbol receives a `Weight` of 1.
Consequently, the `Weight` 1 is necessarily present.
If no symbol has a `Weight` of 1, then the data is considered corrupted.
The most frequent symbol receives a `Weight` anywhere between 1 and 11 (max).
The last symbol's `Weight` is deduced from previously retrieved Weights,
by completing to the nearest power of 2. It's necessarily non 0.