Description
Left-align significant tail bits in a five-bit Base32 symbol and report the zero-fill count.
A positional encoding separates numeric digit values, alphabet symbols and final-block padding. An alphabet lookup is not a whole-stream codec, and character count can differ from the number of source bytes represented.
Left-align significant tail bits in a five-bit Base32 symbol and report the zero-fill count.
When to use this tool
Use Base32 Zero Tail Padbit Writer when checking one alphabet mapping or bounded encoding-padding term.
How to use the tool and how it works
- Enter significantValue, significantBits. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read symbolValue, zeroPadBits. Use the output convention below.
Require whole significantBits in [1,5] and significantValue in [0,2^significantBits-1]. symbolValue = significantValue*2^(5-significantBits); zeroPadBits = 5-significantBits.1
Alphabet, tail pad bits and written padding depend on the selected base encoding. This tool handles only its stated local component.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| significantValue | Significant Value | Required. Safe integer; minimum 0. |
| significantBits | Significant Bits | Required. Safe integer; minimum 1; maximum 5. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| symbolValue | Symbol Value | Required. Safe integer. |
| zeroPadBits | Zero Pad Bits | Required. Safe integer. |
{
"input": {
"significantValue": 3,
"significantBits": 2
},
"output": {
"symbolValue": 24,
"zeroPadBits": 3
}
}Limitations and assumptions
- The significant bits occupy the high end of one five-bit Base32 symbol. This writes tail zero bits only, without alphabet mapping or equals-sign padding.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use the complete codec matching the intended alphabet and padding policy for real payloads and interoperability checks.
References
-
Calculation and input contract: encode/base32-zero-tail-padbit-writer — tool.io
-
Base16, Base32 and Base64: RFC 4648 — Internet Engineering Task Force
Similar or alternative tools
- Encoding: Base32 Pad Character Count
padCharacters is [0,6,4,3,1][byteCount modulo 5]; encodedLength = 8*ceil(byteCount/5).
- Base64 Tail Pad Bit Count
Calculate Base64 tail-byte remainder, written padding count and unused pad-bit count.