Function decode_f64

nodedb-codec/src/pcodec.rs:48–84

Decompress Pcodec f64 data.

(data: &[u8])

/// Decompress Pcodec f64 data.
pub fn decode_f64(data: &[u8]) -> Result<Vec<f64>, CodecError> {
    if data.len() < 5 {
        return Err(CodecError::Truncated {
            expected: 5,
            actual: data.len(),
        });
    }

    let tag = data[0];
    if tag != TAG_F64 {
        return Err(CodecError::Corrupt {
            detail: format!("pcodec expected f64 tag (0), got {tag}"),
        });
    }

    let count = u32::from_le_bytes([data[1], data[2], data[3], data[4]]) as usize;
    if count == 0 {
        return Ok(Vec::new());
    }

    let values: Vec<f64> = pco::standalone::simple_decompress(&data[5..]).map_err(|e| {
        CodecError::DecompressFailed {
            detail: format!("pcodec f64: {e}"),
        }
    })?;

    if values.len() != count {
        return Err(CodecError::Corrupt {
            detail: format!(
                "pcodec f64 count mismatch: header says {count}, got {}",
                values.len()
            ),
        });
    }

    Ok(values)
}

// ---------------------------------------------------------------------------
// i64 encode / decode