Function read_i64

nodedb-query/src/msgpack_scan/reader.rs:245–266

Read an i64 from the value at `offset`. Handles all integer types. Floats return `None` — use `read_f64` for those.

(buf: &[u8], offset: usize)

/// Read an i64 from the value at `offset`. Handles all integer types.
/// Floats return `None` — use `read_f64` for those.
pub fn read_i64(buf: &[u8], offset: usize) -> Option<i64> {
    let tag = get(buf, offset)?;
    match tag {
        0x00..=0x7f => Some(tag as i64),
        0xe0..=0xff => Some((tag as i8) as i64),
        UINT8 => Some(get(buf, offset + 1)? as i64),
        UINT16 => Some(read_u16_be(buf, offset + 1)? as i64),
        UINT32 => Some(read_u32_be(buf, offset + 1)? as i64),
        UINT64 => {
            let v = read_u64_be(buf, offset + 1)?;
            Some(v as i64)
        }
        INT8 => Some(get(buf, offset + 1)? as i8 as i64),
        INT16 => Some(read_u16_be(buf, offset + 1)? as i16 as i64),
        INT32 => Some(read_u32_be(buf, offset + 1)? as i32 as i64),
        INT64 => {
            let v = read_u64_be(buf, offset + 1)?;
            Some(v as i64)
        }
        _ => None,
    }
}

/// Read a string slice from the value at `offset`. Zero-copy — borrows
/// directly from the input buffer. Returns `None` for non-string types