Description
Return field width from inclusive bit endpoints.
Bit positions are usually counted from the least-significant bit, while a displayed binary string has its own left-to-right indexing convention. Masks, fields and parity predicates describe a selected region or pattern; local agreement does not validate a complete encoded record.
Return field width from inclusive bit endpoints.
When to use this tool
Use Bitwise: Bitfield Width From Endpoints when checking the stated mask, field, parity or bit-index convention.
How to use the tool and how it works
- Enter lowBit, highBit, wordWidth. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read result. Expand result to inspect the returned fields.
Return field width from inclusive bit endpoints. Require wordWidth 1..128 and 0 <= lowBit <= highBit < wordWidth; width = high-low+1.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| lowBit | Low Bit | Required. Safe integer. Calculation range: 0 through wordWidth - 1, inclusive. |
| highBit | High Bit | Required. Safe integer. Calculation range: lowBit through wordWidth - 1, inclusive. |
| wordWidth | Word Width | Required. Safe integer. Calculation range: 1 through 128, inclusive. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| result | Returned calculated value or nested object under the stated output convention. | Required. Object. |
| result.width | Width under the stated bit, interval or geometry convention; apply the field-specific units and bounds. | Calculated result member: number. |
{
"input": {
"lowBit": 2,
"highBit": 5,
"wordWidth": 8
},
"output": {
"result": {
"width": 4
}
}
}Limitations and assumptions
- This requires a nonempty field and uses least-significant-based endpoint labels without extracting or moving bits.
- Outputs are nested inside result. 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
Choose an explicit bit order, word width and missing-position policy; use the complete record format and appropriate parsing or checksum methods for full validation.
References
Similar or alternative tools
- Bitwise: Field Mask From Low Bit Width
Return a shifted contiguous field mask.
- Bitfield Offset Alignment Remainder
Return offset alignment remainder and required padding.