Function decode

nodedb-codec/src/fastlanes/mod.rs:71–103

Decode FOR + bit-packed bytes back to i64 values.

(data: &[u8])

/// Decode FOR + bit-packed bytes back to i64 values.
pub fn decode(data: &[u8]) -> Result<Vec<i64>, CodecError> {
    if data.len() < GLOBAL_HEADER_SIZE {
        return Err(CodecError::Truncated {
            expected: GLOBAL_HEADER_SIZE,
            actual: data.len(),
        });
    }

    let total_count = u32::from_le_bytes([data[0], data[1], data[2], data[3]]) as usize;
    let block_count = u16::from_le_bytes([data[4], data[5]]) as usize;

    if total_count == 0 {
        return Ok(Vec::new());
    }

    let mut values = Vec::with_capacity(total_count);
    let mut offset = GLOBAL_HEADER_SIZE;

    for block_idx in 0..block_count {
        offset = decode_block(data, offset, &mut values, block_idx)?;
    }

    if values.len() != total_count {
        return Err(CodecError::Corrupt {
            detail: format!(
                "value count mismatch: header says {total_count}, decoded {}",
                values.len()
            ),
        });
    }

    Ok(values)
}

/// Compute byte offsets for each block in an encoded stream.
///