Merging upstream version 1.73.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 912 insertions, 0 deletions

diff --git a/vendor/httpdate/.cargo-checksum.json b/vendor/httpdate/.cargo-checksum.json
new file mode 100644
index 000000000..adaf3eceb
--- /dev/null
+++ b/vendor/httpdate/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{"Cargo.toml":"214f35d88fe24ad0bce0c89aa14912a083e7a3bd496cd6c39c915931ee32674f","LICENSE-APACHE":"4d10fe5f3aa176b05b229a248866bad70b834c173f1252a814ff4748d8a13837","LICENSE-MIT":"934887691e05d69d7c86ad3f2c360980fa30c15b035e351f3c9865e99da4debc","README.md":"26318a99a935b392b4fc7527e2376ee67e6b7bb75558882173d25c4408ce9273","benches/benchmarks.rs":"13f1208dfb86e3c02dcd67a4c08c2bae300c0a153de5df437eac4a136579ec23","src/date.rs":"bb1afb1189a9da7f8246f5fd4594d4b29c27bf8da3642fddd9bf54b7ce0b1bd8","src/lib.rs":"83e73452762adf92f4ab476276d6ad72bce9142ffbf730bd0c47549a8dff2699"},"package":"c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"}
\ No newline at end of file
diff --git a/vendor/httpdate/Cargo.toml b/vendor/httpdate/Cargo.toml
new file mode 100644
index 000000000..572ff232e
--- /dev/null
+++ b/vendor/httpdate/Cargo.toml
@@ -0,0 +1,27 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "httpdate"
+version = "1.0.2"
+authors = ["Pyfisch <pyfisch@posteo.org>"]
+description = "HTTP date parsing and formatting"
+readme = "README.md"
+keywords = ["http", "date", "time", "simple", "timestamp"]
+license = "MIT/Apache-2.0"
+repository = "https://github.com/pyfisch/httpdate"
+
+[[bench]]
+name = "benchmarks"
+harness = false
+[dev-dependencies.criterion]
+version = "0.3.5"
diff --git a/vendor/httpdate/LICENSE-APACHE b/vendor/httpdate/LICENSE-APACHE
new file mode 100644
index 000000000..cd482d897
--- /dev/null
+++ b/vendor/httpdate/LICENSE-APACHE
@@ -0,0 +1,201 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
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+whether in tort (including negligence), contract, or otherwise,
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+
+Unless required by applicable law or agreed to in writing, software
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diff --git a/vendor/httpdate/LICENSE-MIT b/vendor/httpdate/LICENSE-MIT
new file mode 100644
index 000000000..881996415
--- /dev/null
+++ b/vendor/httpdate/LICENSE-MIT
@@ -0,0 +1,19 @@
+Copyright (c) 2016 Pyfisch
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/vendor/httpdate/README.md b/vendor/httpdate/README.md
new file mode 100644
index 000000000..c90c6f425
--- /dev/null
+++ b/vendor/httpdate/README.md
@@ -0,0 +1,27 @@
+# Date and time utils for HTTP.
+
+[![Build Status](https://travis-ci.org/pyfisch/httpdate.svg?branch=master)](https://travis-ci.org/pyfisch/httpdate)
+[![Crates.io](https://img.shields.io/crates/v/httpdate.svg)](https://crates.io/crates/httpdate)
+[![Documentation](https://docs.rs/httpdate/badge.svg)](https://docs.rs/httpdate)
+
+Multiple HTTP header fields store timestamps.
+For example a response created on May 15, 2015 may contain the header
+`Date: Fri, 15 May 2015 15:34:21 GMT`. Since the timestamp does not
+contain any timezone or leap second information it is equvivalent to
+writing 1431696861 Unix time. Rust’s `SystemTime` is used to store
+these timestamps.
+
+This crate provides two public functions:
+
+* `parse_http_date` to parse a HTTP datetime string to a system time
+* `fmt_http_date` to format a system time to a IMF-fixdate
+
+In addition it exposes the `HttpDate` type that can be used to parse
+and format timestamps. Convert a sytem time to `HttpDate` and vice versa.
+The `HttpType` (8 bytes) is smaller than `SystemTime` (16 bytes) and
+using the display impl avoids a temporary allocation.
+
+Read the [blog post](https://pyfisch.org/blog/http-datetime-handling/) to learn
+more.
+
+Fuzz it by installing *cargo-fuzz* and running `cargo fuzz run fuzz_target_1`.
diff --git a/vendor/httpdate/benches/benchmarks.rs b/vendor/httpdate/benches/benchmarks.rs
new file mode 100644
index 000000000..4f82467bd
--- /dev/null
+++ b/vendor/httpdate/benches/benchmarks.rs
@@ -0,0 +1,57 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+pub fn parse_imf_fixdate(c: &mut Criterion) {
+    c.bench_function("parse_imf_fixdate", |b| {
+        b.iter(|| {
+            let d = black_box("Sun, 06 Nov 1994 08:49:37 GMT");
+            black_box(httpdate::parse_http_date(d)).unwrap();
+        })
+    });
+}
+
+pub fn parse_rfc850_date(c: &mut Criterion) {
+    c.bench_function("parse_rfc850_date", |b| {
+        b.iter(|| {
+            let d = black_box("Sunday, 06-Nov-94 08:49:37 GMT");
+            black_box(httpdate::parse_http_date(d)).unwrap();
+        })
+    });
+}
+
+pub fn parse_asctime(c: &mut Criterion) {
+    c.bench_function("parse_asctime", |b| {
+        b.iter(|| {
+            let d = black_box("Sun Nov  6 08:49:37 1994");
+            black_box(httpdate::parse_http_date(d)).unwrap();
+        })
+    });
+}
+
+struct BlackBoxWrite;
+
+impl std::fmt::Write for BlackBoxWrite {
+    fn write_str(&mut self, s: &str) -> Result<(), std::fmt::Error> {
+        black_box(s);
+        Ok(())
+    }
+}
+
+pub fn encode_date(c: &mut Criterion) {
+    c.bench_function("encode_date", |b| {
+        let d = "Wed, 21 Oct 2015 07:28:00 GMT";
+        black_box(httpdate::parse_http_date(d)).unwrap();
+        b.iter(|| {
+            use std::fmt::Write;
+            let _ = write!(BlackBoxWrite, "{}", d);
+        })
+    });
+}
+
+criterion_group!(
+    benches,
+    parse_imf_fixdate,
+    parse_rfc850_date,
+    parse_asctime,
+    encode_date
+);
+criterion_main!(benches);
diff --git a/vendor/httpdate/src/date.rs b/vendor/httpdate/src/date.rs
new file mode 100644
index 000000000..9f780b65c
--- /dev/null
+++ b/vendor/httpdate/src/date.rs
@@ -0,0 +1,420 @@
+use std::cmp;
+use std::fmt::{self, Display, Formatter};
+use std::str::FromStr;
+use std::time::{Duration, SystemTime, UNIX_EPOCH};
+
+use crate::Error;
+
+/// HTTP timestamp type.
+///
+/// Parse using `FromStr` impl.
+/// Format using the `Display` trait.
+/// Convert timestamp into/from `SytemTime` to use.
+/// Supports comparsion and sorting.
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Hash)]
+pub struct HttpDate {
+    /// 0...59
+    sec: u8,
+    /// 0...59
+    min: u8,
+    /// 0...23
+    hour: u8,
+    /// 1...31
+    day: u8,
+    /// 1...12
+    mon: u8,
+    /// 1970...9999
+    year: u16,
+    /// 1...7
+    wday: u8,
+}
+
+impl HttpDate {
+    fn is_valid(&self) -> bool {
+        self.sec < 60
+            && self.min < 60
+            && self.hour < 24
+            && self.day > 0
+            && self.day < 32
+            && self.mon > 0
+            && self.mon <= 12
+            && self.year >= 1970
+            && self.year <= 9999
+            && &HttpDate::from(SystemTime::from(*self)) == self
+    }
+}
+
+impl From<SystemTime> for HttpDate {
+    fn from(v: SystemTime) -> HttpDate {
+        let dur = v
+            .duration_since(UNIX_EPOCH)
+            .expect("all times should be after the epoch");
+        let secs_since_epoch = dur.as_secs();
+
+        if secs_since_epoch >= 253402300800 {
+            // year 9999
+            panic!("date must be before year 9999");
+        }
+
+        /* 2000-03-01 (mod 400 year, immediately after feb29 */
+        const LEAPOCH: i64 = 11017;
+        const DAYS_PER_400Y: i64 = 365 * 400 + 97;
+        const DAYS_PER_100Y: i64 = 365 * 100 + 24;
+        const DAYS_PER_4Y: i64 = 365 * 4 + 1;
+
+        let days = (secs_since_epoch / 86400) as i64 - LEAPOCH;
+        let secs_of_day = secs_since_epoch % 86400;
+
+        let mut qc_cycles = days / DAYS_PER_400Y;
+        let mut remdays = days % DAYS_PER_400Y;
+
+        if remdays < 0 {
+            remdays += DAYS_PER_400Y;
+            qc_cycles -= 1;
+        }
+
+        let mut c_cycles = remdays / DAYS_PER_100Y;
+        if c_cycles == 4 {
+            c_cycles -= 1;
+        }
+        remdays -= c_cycles * DAYS_PER_100Y;
+
+        let mut q_cycles = remdays / DAYS_PER_4Y;
+        if q_cycles == 25 {
+            q_cycles -= 1;
+        }
+        remdays -= q_cycles * DAYS_PER_4Y;
+
+        let mut remyears = remdays / 365;
+        if remyears == 4 {
+            remyears -= 1;
+        }
+        remdays -= remyears * 365;
+
+        let mut year = 2000 + remyears + 4 * q_cycles + 100 * c_cycles + 400 * qc_cycles;
+
+        let months = [31, 30, 31, 30, 31, 31, 30, 31, 30, 31, 31, 29];
+        let mut mon = 0;
+        for mon_len in months.iter() {
+            mon += 1;
+            if remdays < *mon_len {
+                break;
+            }
+            remdays -= *mon_len;
+        }
+        let mday = remdays + 1;
+        let mon = if mon + 2 > 12 {
+            year += 1;
+            mon - 10
+        } else {
+            mon + 2
+        };
+
+        let mut wday = (3 + days) % 7;
+        if wday <= 0 {
+            wday += 7
+        };
+
+        HttpDate {
+            sec: (secs_of_day % 60) as u8,
+            min: ((secs_of_day % 3600) / 60) as u8,
+            hour: (secs_of_day / 3600) as u8,
+            day: mday as u8,
+            mon: mon as u8,
+            year: year as u16,
+            wday: wday as u8,
+        }
+    }
+}
+
+impl From<HttpDate> for SystemTime {
+    fn from(v: HttpDate) -> SystemTime {
+        let leap_years =
+            ((v.year - 1) - 1968) / 4 - ((v.year - 1) - 1900) / 100 + ((v.year - 1) - 1600) / 400;
+        let mut ydays = match v.mon {
+            1 => 0,
+            2 => 31,
+            3 => 59,
+            4 => 90,
+            5 => 120,
+            6 => 151,
+            7 => 181,
+            8 => 212,
+            9 => 243,
+            10 => 273,
+            11 => 304,
+            12 => 334,
+            _ => unreachable!(),
+        } + v.day as u64
+            - 1;
+        if is_leap_year(v.year) && v.mon > 2 {
+            ydays += 1;
+        }
+        let days = (v.year as u64 - 1970) * 365 + leap_years as u64 + ydays;
+        UNIX_EPOCH
+            + Duration::from_secs(
+                v.sec as u64 + v.min as u64 * 60 + v.hour as u64 * 3600 + days * 86400,
+            )
+    }
+}
+
+impl FromStr for HttpDate {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<HttpDate, Error> {
+        if !s.is_ascii() {
+            return Err(Error(()));
+        }
+        let x = s.trim().as_bytes();
+        let date = parse_imf_fixdate(x)
+            .or_else(|_| parse_rfc850_date(x))
+            .or_else(|_| parse_asctime(x))?;
+        if !date.is_valid() {
+            return Err(Error(()));
+        }
+        Ok(date)
+    }
+}
+
+impl Display for HttpDate {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        let wday = match self.wday {
+            1 => b"Mon",
+            2 => b"Tue",
+            3 => b"Wed",
+            4 => b"Thu",
+            5 => b"Fri",
+            6 => b"Sat",
+            7 => b"Sun",
+            _ => unreachable!(),
+        };
+
+        let mon = match self.mon {
+            1 => b"Jan",
+            2 => b"Feb",
+            3 => b"Mar",
+            4 => b"Apr",
+            5 => b"May",
+            6 => b"Jun",
+            7 => b"Jul",
+            8 => b"Aug",
+            9 => b"Sep",
+            10 => b"Oct",
+            11 => b"Nov",
+            12 => b"Dec",
+            _ => unreachable!(),
+        };
+
+        let mut buf: [u8; 29] = *b"   , 00     0000 00:00:00 GMT";
+        buf[0] = wday[0];
+        buf[1] = wday[1];
+        buf[2] = wday[2];
+        buf[5] = b'0' + (self.day / 10) as u8;
+        buf[6] = b'0' + (self.day % 10) as u8;
+        buf[8] = mon[0];
+        buf[9] = mon[1];
+        buf[10] = mon[2];
+        buf[12] = b'0' + (self.year / 1000) as u8;
+        buf[13] = b'0' + (self.year / 100 % 10) as u8;
+        buf[14] = b'0' + (self.year / 10 % 10) as u8;
+        buf[15] = b'0' + (self.year % 10) as u8;
+        buf[17] = b'0' + (self.hour / 10) as u8;
+        buf[18] = b'0' + (self.hour % 10) as u8;
+        buf[20] = b'0' + (self.min / 10) as u8;
+        buf[21] = b'0' + (self.min % 10) as u8;
+        buf[23] = b'0' + (self.sec / 10) as u8;
+        buf[24] = b'0' + (self.sec % 10) as u8;
+        f.write_str(std::str::from_utf8(&buf[..]).unwrap())
+    }
+}
+
+impl Ord for HttpDate {
+    fn cmp(&self, other: &HttpDate) -> cmp::Ordering {
+        SystemTime::from(*self).cmp(&SystemTime::from(*other))
+    }
+}
+
+impl PartialOrd for HttpDate {
+    fn partial_cmp(&self, other: &HttpDate) -> Option<cmp::Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+fn toint_1(x: u8) -> Result<u8, Error> {
+    let result = x.wrapping_sub(b'0');
+    if result < 10 {
+        Ok(result)
+    } else {
+        Err(Error(()))
+    }
+}
+
+fn toint_2(s: &[u8]) -> Result<u8, Error> {
+    let high = s[0].wrapping_sub(b'0');
+    let low = s[1].wrapping_sub(b'0');
+
+    if high < 10 && low < 10 {
+        Ok(high * 10 + low)
+    } else {
+        Err(Error(()))
+    }
+}
+
+#[allow(clippy::many_single_char_names)]
+fn toint_4(s: &[u8]) -> Result<u16, Error> {
+    let a = u16::from(s[0].wrapping_sub(b'0'));
+    let b = u16::from(s[1].wrapping_sub(b'0'));
+    let c = u16::from(s[2].wrapping_sub(b'0'));
+    let d = u16::from(s[3].wrapping_sub(b'0'));
+
+    if a < 10 && b < 10 && c < 10 && d < 10 {
+        Ok(a * 1000 + b * 100 + c * 10 + d)
+    } else {
+        Err(Error(()))
+    }
+}
+
+fn parse_imf_fixdate(s: &[u8]) -> Result<HttpDate, Error> {
+    // Example: `Sun, 06 Nov 1994 08:49:37 GMT`
+    if s.len() != 29 || &s[25..] != b" GMT" || s[16] != b' ' || s[19] != b':' || s[22] != b':' {
+        return Err(Error(()));
+    }
+    Ok(HttpDate {
+        sec: toint_2(&s[23..25])?,
+        min: toint_2(&s[20..22])?,
+        hour: toint_2(&s[17..19])?,
+        day: toint_2(&s[5..7])?,
+        mon: match &s[7..12] {
+            b" Jan " => 1,
+            b" Feb " => 2,
+            b" Mar " => 3,
+            b" Apr " => 4,
+            b" May " => 5,
+            b" Jun " => 6,
+            b" Jul " => 7,
+            b" Aug " => 8,
+            b" Sep " => 9,
+            b" Oct " => 10,
+            b" Nov " => 11,
+            b" Dec " => 12,
+            _ => return Err(Error(())),
+        },
+        year: toint_4(&s[12..16])?,
+        wday: match &s[..5] {
+            b"Mon, " => 1,
+            b"Tue, " => 2,
+            b"Wed, " => 3,
+            b"Thu, " => 4,
+            b"Fri, " => 5,
+            b"Sat, " => 6,
+            b"Sun, " => 7,
+            _ => return Err(Error(())),
+        },
+    })
+}
+
+fn parse_rfc850_date(s: &[u8]) -> Result<HttpDate, Error> {
+    // Example: `Sunday, 06-Nov-94 08:49:37 GMT`
+    if s.len() < 23 {
+        return Err(Error(()));
+    }
+
+    fn wday<'a>(s: &'a [u8], wday: u8, name: &'static [u8]) -> Option<(u8, &'a [u8])> {
+        if &s[0..name.len()] == name {
+            return Some((wday, &s[name.len()..]));
+        }
+        None
+    }
+    let (wday, s) = wday(s, 1, b"Monday, ")
+        .or_else(|| wday(s, 2, b"Tuesday, "))
+        .or_else(|| wday(s, 3, b"Wednesday, "))
+        .or_else(|| wday(s, 4, b"Thursday, "))
+        .or_else(|| wday(s, 5, b"Friday, "))
+        .or_else(|| wday(s, 6, b"Saturday, "))
+        .or_else(|| wday(s, 7, b"Sunday, "))
+        .ok_or(Error(()))?;
+    if s.len() != 22 || s[12] != b':' || s[15] != b':' || &s[18..22] != b" GMT" {
+        return Err(Error(()));
+    }
+    let mut year = u16::from(toint_2(&s[7..9])?);
+    if year < 70 {
+        year += 2000;
+    } else {
+        year += 1900;
+    }
+    Ok(HttpDate {
+        sec: toint_2(&s[16..18])?,
+        min: toint_2(&s[13..15])?,
+        hour: toint_2(&s[10..12])?,
+        day: toint_2(&s[0..2])?,
+        mon: match &s[2..7] {
+            b"-Jan-" => 1,
+            b"-Feb-" => 2,
+            b"-Mar-" => 3,
+            b"-Apr-" => 4,
+            b"-May-" => 5,
+            b"-Jun-" => 6,
+            b"-Jul-" => 7,
+            b"-Aug-" => 8,
+            b"-Sep-" => 9,
+            b"-Oct-" => 10,
+            b"-Nov-" => 11,
+            b"-Dec-" => 12,
+            _ => return Err(Error(())),
+        },
+        year,
+        wday,
+    })
+}
+
+fn parse_asctime(s: &[u8]) -> Result<HttpDate, Error> {
+    // Example: `Sun Nov  6 08:49:37 1994`
+    if s.len() != 24 || s[10] != b' ' || s[13] != b':' || s[16] != b':' || s[19] != b' ' {
+        return Err(Error(()));
+    }
+    Ok(HttpDate {
+        sec: toint_2(&s[17..19])?,
+        min: toint_2(&s[14..16])?,
+        hour: toint_2(&s[11..13])?,
+        day: {
+            let x = &s[8..10];
+            {
+                if x[0] == b' ' {
+                    toint_1(x[1])
+                } else {
+                    toint_2(x)
+                }
+            }?
+        },
+        mon: match &s[4..8] {
+            b"Jan " => 1,
+            b"Feb " => 2,
+            b"Mar " => 3,
+            b"Apr " => 4,
+            b"May " => 5,
+            b"Jun " => 6,
+            b"Jul " => 7,
+            b"Aug " => 8,
+            b"Sep " => 9,
+            b"Oct " => 10,
+            b"Nov " => 11,
+            b"Dec " => 12,
+            _ => return Err(Error(())),
+        },
+        year: toint_4(&s[20..24])?,
+        wday: match &s[0..4] {
+            b"Mon " => 1,
+            b"Tue " => 2,
+            b"Wed " => 3,
+            b"Thu " => 4,
+            b"Fri " => 5,
+            b"Sat " => 6,
+            b"Sun " => 7,
+            _ => return Err(Error(())),
+        },
+    })
+}
+
+fn is_leap_year(y: u16) -> bool {
+    y % 4 == 0 && (y % 100 != 0 || y % 400 == 0)
+}
diff --git a/vendor/httpdate/src/lib.rs b/vendor/httpdate/src/lib.rs
new file mode 100644
index 000000000..32603d630
--- /dev/null
+++ b/vendor/httpdate/src/lib.rs
@@ -0,0 +1,160 @@
+//! Date and time utils for HTTP.
+//!
+//! Multiple HTTP header fields store timestamps.
+//! For example a response created on May 15, 2015 may contain the header
+//! `Date: Fri, 15 May 2015 15:34:21 GMT`. Since the timestamp does not
+//! contain any timezone or leap second information it is equvivalent to
+//! writing 1431696861 Unix time. Rust’s `SystemTime` is used to store
+//! these timestamps.
+//!
+//! This crate provides two public functions:
+//!
+//! * `parse_http_date` to parse a HTTP datetime string to a system time
+//! * `fmt_http_date` to format a system time to a IMF-fixdate
+//!
+//! In addition it exposes the `HttpDate` type that can be used to parse
+//! and format timestamps. Convert a sytem time to `HttpDate` and vice versa.
+//! The `HttpType` (8 bytes) is smaller than `SystemTime` (16 bytes) and
+//! using the display impl avoids a temporary allocation.
+#![forbid(unsafe_code)]
+
+use std::error;
+use std::fmt::{self, Display, Formatter};
+use std::io;
+use std::time::SystemTime;
+
+pub use date::HttpDate;
+
+mod date;
+
+/// An opaque error type for all parsing errors.
+#[derive(Debug)]
+pub struct Error(());
+
+impl error::Error for Error {}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter) -> Result<(), fmt::Error> {
+        f.write_str("string contains no or an invalid date")
+    }
+}
+
+impl From<Error> for io::Error {
+    fn from(e: Error) -> io::Error {
+        io::Error::new(io::ErrorKind::Other, e)
+    }
+}
+
+/// Parse a date from an HTTP header field.
+///
+/// Supports the preferred IMF-fixdate and the legacy RFC 805 and
+/// ascdate formats. Two digit years are mapped to dates between
+/// 1970 and 2069.
+pub fn parse_http_date(s: &str) -> Result<SystemTime, Error> {
+    s.parse::<HttpDate>().map(|d| d.into())
+}
+
+/// Format a date to be used in a HTTP header field.
+///
+/// Dates are formatted as IMF-fixdate: `Fri, 15 May 2015 15:34:21 GMT`.
+pub fn fmt_http_date(d: SystemTime) -> String {
+    format!("{}", HttpDate::from(d))
+}
+
+#[cfg(test)]
+mod tests {
+    use std::str;
+    use std::time::{Duration, UNIX_EPOCH};
+
+    use super::{fmt_http_date, parse_http_date, HttpDate};
+
+    #[test]
+    fn test_rfc_example() {
+        let d = UNIX_EPOCH + Duration::from_secs(784111777);
+        assert_eq!(
+            d,
+            parse_http_date("Sun, 06 Nov 1994 08:49:37 GMT").expect("#1")
+        );
+        assert_eq!(
+            d,
+            parse_http_date("Sunday, 06-Nov-94 08:49:37 GMT").expect("#2")
+        );
+        assert_eq!(d, parse_http_date("Sun Nov  6 08:49:37 1994").expect("#3"));
+    }
+
+    #[test]
+    fn test2() {
+        let d = UNIX_EPOCH + Duration::from_secs(1475419451);
+        assert_eq!(
+            d,
+            parse_http_date("Sun, 02 Oct 2016 14:44:11 GMT").expect("#1")
+        );
+        assert!(parse_http_date("Sun Nov 10 08:00:00 1000").is_err());
+        assert!(parse_http_date("Sun Nov 10 08*00:00 2000").is_err());
+        assert!(parse_http_date("Sunday, 06-Nov-94 08+49:37 GMT").is_err());
+    }
+
+    #[test]
+    fn test3() {
+        let mut d = UNIX_EPOCH;
+        assert_eq!(d, parse_http_date("Thu, 01 Jan 1970 00:00:00 GMT").unwrap());
+        d += Duration::from_secs(3600);
+        assert_eq!(d, parse_http_date("Thu, 01 Jan 1970 01:00:00 GMT").unwrap());
+        d += Duration::from_secs(86400);
+        assert_eq!(d, parse_http_date("Fri, 02 Jan 1970 01:00:00 GMT").unwrap());
+        d += Duration::from_secs(2592000);
+        assert_eq!(d, parse_http_date("Sun, 01 Feb 1970 01:00:00 GMT").unwrap());
+        d += Duration::from_secs(2592000);
+        assert_eq!(d, parse_http_date("Tue, 03 Mar 1970 01:00:00 GMT").unwrap());
+        d += Duration::from_secs(31536005);
+        assert_eq!(d, parse_http_date("Wed, 03 Mar 1971 01:00:05 GMT").unwrap());
+        d += Duration::from_secs(15552000);
+        assert_eq!(d, parse_http_date("Mon, 30 Aug 1971 01:00:05 GMT").unwrap());
+        d += Duration::from_secs(6048000);
+        assert_eq!(d, parse_http_date("Mon, 08 Nov 1971 01:00:05 GMT").unwrap());
+        d += Duration::from_secs(864000000);
+        assert_eq!(d, parse_http_date("Fri, 26 Mar 1999 01:00:05 GMT").unwrap());
+    }
+
+    #[test]
+    fn test_fmt() {
+        let d = UNIX_EPOCH;
+        assert_eq!(fmt_http_date(d), "Thu, 01 Jan 1970 00:00:00 GMT");
+        let d = UNIX_EPOCH + Duration::from_secs(1475419451);
+        assert_eq!(fmt_http_date(d), "Sun, 02 Oct 2016 14:44:11 GMT");
+    }
+
+    #[allow(dead_code)]
+    fn testcase(data: &[u8]) {
+        if let Ok(s) = str::from_utf8(data) {
+            println!("{:?}", s);
+            if let Ok(d) = parse_http_date(s) {
+                let o = fmt_http_date(d);
+                assert!(!o.is_empty());
+            }
+        }
+    }
+
+    #[test]
+    fn size_of() {
+        assert_eq!(::std::mem::size_of::<HttpDate>(), 8);
+    }
+
+    #[test]
+    fn test_date_comparison() {
+        let a = UNIX_EPOCH + Duration::from_secs(784111777);
+        let b = a + Duration::from_secs(30);
+        assert!(a < b);
+        let a_date: HttpDate = a.into();
+        let b_date: HttpDate = b.into();
+        assert!(a_date < b_date);
+        assert_eq!(a_date.cmp(&b_date), ::std::cmp::Ordering::Less)
+    }
+
+    #[test]
+    fn test_parse_bad_date() {
+        // 1994-11-07 is actually a Monday
+        let parsed = "Sun, 07 Nov 1994 08:48:37 GMT".parse::<HttpDate>();
+        assert!(parsed.is_err())
+    }
+}