pub fn to_satisfiable_range(&self, full_length: u64) -> Option<(u64, u64)> {
        // If the full length is zero, there is no satisfiable end-inclusive range.
        if full_length == 0 {
            return None;
        }
        match self {
            &ByteRangeSpec::FromTo(from, to) => {
                if from < full_length && from <= to {
                    Some((from, ::std::cmp::min(to, full_length - 1)))
                } else {
                    None
                }
            }
            &ByteRangeSpec::AllFrom(from) => {
                if from < full_length {
                    Some((from, full_length - 1))
                } else {
                    None
                }
            }
            &ByteRangeSpec::Last(last) => {
                if last > 0 {
                    // From the RFC: If the selected representation is shorter
                    // than the specified suffix-length,
                    // the entire representation is used.
                    if last > full_length {
                        Some((0, full_length - 1))
                    } else {
                        Some((full_length - last, full_length - 1))
                    }
                } else {
                    None
                }
            }
        }
    }
/// Given the full length of the entity, attempt to normalize the byte range
/// into an satisfiable end-inclusive (from, to) range.
///
/// The resulting range is guaranteed to be a satisfiable range within the
/// bounds of `0 <= from <= to < full_length`.
///
/// If the byte range is deemed unsatisfiable, `None` is returned.
/// An unsatisfiable range is generally cause for a server to either reject
/// the client request with a `416 Range Not Satisfiable` status code, or to
/// simply ignore the range header and serve the full entity using a `200
/// OK` status code.
///
/// This function closely follows [RFC 7233][1] section 2.1.
/// As such, it considers ranges to be satisfiable if they meet the
/// following conditions:
///
/// > If a valid byte-range-set includes at least one byte-range-spec with
/// a first-byte-pos that is less than the current length of the
/// representation, or at least one suffix-byte-range-spec with a
/// non-zero suffix-length, then the byte-range-set is satisfiable.
/// Otherwise, the byte-range-set is unsatisfiable.
///
/// The function also computes remainder ranges based on the RFC:
///
/// > If the last-byte-pos value is
/// absent, or if the value is greater than or equal to the current
/// length of the representation data, the byte range is interpreted as
/// the remainder of the representation (i.e., the server replaces the
/// value of last-byte-pos with a value that is one less than the current
/// length of the selected representation).
///
/// [1]: https://tools.ietf.org/html/rfc7233
Given the full length of the entity, attempt to normalize the byte range
into an satisfiable end-inclusive (from, to) range.

The resulting range is guaranteed to be a satisfiable range within the
bounds of `0 <= from <= to < full_length`.

If the byte range is deemed unsatisfiable, `None` is returned.
An unsatisfiable range is generally cause for a server to either reject
the client request with a `416 Range Not Satisfiable` status code, or to
simply ignore the range header and serve the full entity using a `200
OK` status code.

This function closely follows [RFC 7233][1] section 2.1.
As such, it considers ranges to be satisfiable if they meet the
following conditions.



The function also computes remainder ranges based on the RFC.

> If the last-byte-pos value is
absent, or if the value is greater than or equal to the current
length of the representation data, the byte range is interpreted as
the remainder of the representation .


Given the full length of the entity attempt to normalize the byte range into an satisfiable end - inclusive ( from to ) range . The resulting range is guaranteed to be a satisfiable range within the bounds of ` 0 < = from < = to < full_length ` . If the byte range is deemed unsatisfiable ` None ` is returned . An unsatisfiable range is generally cause for a server to either reject the client request with a ` 416 Range Not Satisfiable ` status code or to simply ignore the range header and serve the full entity using a ` 200 OK ` status code . This function closely follows [ RFC 7233 ] [ 1 ] section 2 . 1 . As such it considers ranges to be satisfiable if they meet the following conditions . The function also computes remainder ranges based on the RFC . > If the last - byte - pos value is absent or if the value is greater than or equal to the current length of the representation data the byte range is interpreted as the remainder of the representation .
pub fn to_satisfiable_range(&self, full_length: u64) -> Option<(u64, u64)> {
        // If the full length is zero, there is no satisfiable end-inclusive range.
        if full_length == 0 {
            return None;
        }
        match self {
            &ByteRangeSpec::FromTo(from, to) => {
                if from < full_length && from <= to {
                    Some((from, ::std::cmp::min(to, full_length - 1)))
                } else {
                    None
                }
            }
            &ByteRangeSpec::AllFrom(from) => {
                if from < full_length {
                    Some((from, full_length - 1))
                } else {
                    None
                }
            }
            &ByteRangeSpec::Last(last) => {
                if last > 0 {
                    // From the RFC: If the selected representation is shorter
                    // than the specified suffix-length,
                    // the entire representation is used.
                    if last > full_length {
                        Some((0, full_length - 1))
                    } else {
                        Some((full_length - last, full_length - 1))
                    }
                } else {
                    None
                }
            }
        }
    }
pub fn to_satisfiable_range ( & self , full_length : u64 ) -> Option < ( u64 , u64 ) > { // If the full length is zero, there is no satisfiable end-inclusive range. if full_length == 0 { return None ; } match self { & ByteRangeSpec :: FromTo ( from , to ) => { if from < full_length && from <= to { Some ( ( from , :: std :: cmp :: min ( to , full_length - 1 ) ) ) } else { None } } & ByteRangeSpec :: AllFrom ( from ) => { if from < full_length { Some ( ( from , full_length - 1 ) ) } else { None } } & ByteRangeSpec :: Last ( last ) => { if last > 0 { // From the RFC: If the selected representation is shorter // than the specified suffix-length, // the entire representation is used. if last > full_length { Some ( ( 0 , full_length - 1 ) ) } else { Some ( ( full_length - last , full_length - 1 ) ) } } else { None } } } }
Given the full length of the entity, attempt to normalize the byte range
into an satisfiable end-inclusive (from, to) range.
Given the full length of the entity attempt to normalize the byte range into an satisfiable end - inclusive ( from to ) range .
&self
full_length
u64
&self
full_length
u64