Function align_range_clamped 

pub fn align_range_clamped(
    byte_offset: u64,
    byte_len: u64,
    blob_size: u64,
) -> Result<AlignedRange, RangeVerifyError>

align_range, but an end past the blob clamps to the blob’s end instead of being refused: a claimed size is a hint, and the planner’s bound can overshoot it. Only byte_offset >= blob_size (for a non-empty blob) is refused, with RangeVerifyError::RangeOutOfBounds: a start past the end has no chunk group to anchor, clamped or not. (0, 0) means the whole blob, and the empty blob is addressable only as (0, 0), exactly as in align_range.

Both a node deciding what to serve and a client deciding what wire length to expect call this, so the two always agree on the served range.

Errors

RangeVerifyError::RangeOutOfBounds if byte_offset is at or past a non-empty blob’s end, or (for the empty blob) the request is not (0, 0).