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Add reserved code range for private use by applications #191

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Aug 28, 2020
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Add reserved code range for private use by applications #191

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11 changes: 11 additions & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
- [Multicodec table](#multicodec-table)
- [Adding new multicodecs to the table](#adding-new-multicodecs-to-the-table)
- [Implementations](#implementations)
- [Reserved Code Ranges](#reserved-code-ranges)
- [FAQ](#faq)
- [Contribute](#contribute)
- [License](#license)
Expand Down Expand Up @@ -62,6 +63,16 @@ The `validate.py` script can be used to validate the table once it's edited.
- [Ruby](https://github.com/sleeplessbyte/ruby-multicodec)
- [Add yours today!](https://github.com/multiformats/multicodec/edit/master/table.csv)

## Reserved Code Ranges

The following code ranges have special meaning and may only have meanings assigned to as specified in their description:

### Private Use Area

*Range*: `0x300000 – 0x3FFFFF`

Codes in this range are reserved for internal use by applications and will never be assigned any meaning as part of the Multicodec specification.

## FAQ

> Why varints?
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6 changes: 6 additions & 0 deletions validate.py
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Expand Up @@ -72,6 +72,12 @@ class CheckError(Exception):
)
else:
codes[code] = name

# Reserved Code Range: Private Use Area – Do not permit any codes in this range
if code in range(0x300000, 0x400000):
raise CheckError(
f"found code in Private Use Area: {hex(code)} with name '{name}'"
)
except CheckError as e:
success = False
print(f"row {line}: {e}", file=sys.stderr)
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