Update caddy, fix cross-compiling

4 files changed, 470 insertions, 0 deletions

diff --git a/vendor/github.com/x448/float16/.travis.yml b/vendor/github.com/x448/float16/.travis.yml
new file mode 100644
index 0000000..8902bda
--- /dev/null
+++ b/vendor/github.com/x448/float16/.travis.yml
@@ -0,0 +1,13 @@
+language: go
+
+go:
+  - 1.11.x
+
+env:
+  - GO111MODULE=on 
+  
+script:
+  - go test -short -coverprofile=coverage.txt -covermode=count ./...
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)  
diff --git a/vendor/github.com/x448/float16/LICENSE b/vendor/github.com/x448/float16/LICENSE
new file mode 100644
index 0000000..bf6e357
--- /dev/null
+++ b/vendor/github.com/x448/float16/LICENSE
@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2019 Montgomery Edwards⁴⁴⁸ and Faye Amacker
+
+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/github.com/x448/float16/README.md b/vendor/github.com/x448/float16/README.md
new file mode 100644
index 0000000..b524b81
--- /dev/null
+++ b/vendor/github.com/x448/float16/README.md
@@ -0,0 +1,133 @@
+# Float16 (Binary16) in Go/Golang
+[![Build Status](https://travis-ci.org/x448/float16.svg?branch=master)](https://travis-ci.org/x448/float16)
+[![codecov](https://codecov.io/gh/x448/float16/branch/master/graph/badge.svg?v=4)](https://codecov.io/gh/x448/float16)
+[![Go Report Card](https://goreportcard.com/badge/github.com/x448/float16)](https://goreportcard.com/report/github.com/x448/float16)
+[![Release](https://img.shields.io/github/release/x448/float16.svg?style=flat-square)](https://github.com/x448/float16/releases)
+[![License](http://img.shields.io/badge/license-mit-blue.svg?style=flat-square)](https://raw.githubusercontent.com/x448/float16/master/LICENSE)
+
+`float16` package provides [IEEE 754 half-precision floating-point format (binary16)](https://en.wikipedia.org/wiki/Half-precision_floating-point_format) with IEEE 754 default rounding for conversions. IEEE 754-2008 refers to this 16-bit floating-point format as binary16.
+
+IEEE 754 default rounding ("Round-to-Nearest RoundTiesToEven") is considered the most accurate and statistically unbiased estimate of the true result.
+
+All possible 4+ billion floating-point conversions with this library are verified to be correct.
+
+Lowercase "float16" refers to IEEE 754 binary16. And capitalized "Float16" refers to exported Go data type provided by this library.
+
+## Features
+Current features include:
+
+* float16 to float32 conversions use lossless conversion.
+* float32 to float16 conversions use IEEE 754-2008 "Round-to-Nearest RoundTiesToEven".
+* conversions using pure Go take about 2.65 ns/op on a desktop amd64.
+* unit tests provide 100% code coverage and check all possible 4+ billion conversions.
+* other functions include: IsInf(), IsNaN(), IsNormal(), PrecisionFromfloat32(), String(), etc.
+* all functions in this library use zero allocs except String().
+
+## Status
+This library is used by [fxamacker/cbor](https://github.com/fxamacker/cbor) and is ready for production use on supported platforms. The version number < 1.0 indicates more functions and options are planned but not yet published.
+
+Current status:
+
+* core API is done and breaking API changes are unlikely.
+* 100% of unit tests pass:
+  * short mode (`go test -short`) tests around 65765 conversions in 0.005s.  
+  * normal mode (`go test`) tests all possible 4+ billion conversions in about 95s.  
+* 100% code coverage with both short mode and normal mode.  
+* tested on amd64 but it should work on all little-endian platforms supported by Go.
+ 
+Roadmap:
+
+* add functions for fast batch conversions leveraging SIMD when supported by hardware.
+* speed up unit test when verifying all possible 4+ billion conversions.
+* test on additional platforms.
+ 
+## Float16 to Float32 Conversion
+Conversions from float16 to float32 are lossless conversions.  All 65536 possible float16 to float32 conversions (in pure Go) are confirmed to be correct.  
+
+Unit tests take a fraction of a second to check all 65536 expected values for float16 to float32 conversions.
+
+## Float32 to Float16 Conversion
+Conversions from float32 to float16 use IEEE 754 default rounding ("Round-to-Nearest RoundTiesToEven").  All 4294967296 possible float32 to float16 conversions (in pure Go) are confirmed to be correct.  
+
+Unit tests in normal mode take about 1-2 minutes to check all 4+ billion float32 input values and results for Fromfloat32(), FromNaN32ps(), and PrecisionFromfloat32(). 
+
+Unit tests in short mode use a small subset (around 229 float32 inputs) and finish in under 0.01 second while still reaching 100% code coverage.
+
+## Usage
+Install with `go get github.com/x448/float16`.
+```
+// Convert float32 to float16
+pi := float32(math.Pi)
+pi16 := float16.Fromfloat32(pi)
+
+// Convert float16 to float32
+pi32 := pi16.Float32()
+
+// PrecisionFromfloat32() is faster than the overhead of calling a function.
+// This example only converts if there's no data loss and input is not a subnormal.
+if float16.PrecisionFromfloat32(pi) == float16.PrecisionExact {
+    pi16 := float16.Fromfloat32(pi)
+}
+```
+
+## Float16 Type and API
+Float16 (capitalized) is a Go type with uint16 as the underlying state.  There are 6 exported functions and 9 exported methods.
+```
+package float16 // import "github.com/x448/float16"
+
+// Exported types and consts
+type Float16 uint16
+const ErrInvalidNaNValue = float16Error("float16: invalid NaN value, expected IEEE 754 NaN")
+
+// Exported functions
+Fromfloat32(f32 float32) Float16   // Float16 number converted from f32 using IEEE 754 default rounding
+                                      with identical results to AMD and Intel F16C hardware. NaN inputs 
+                                      are converted with quiet bit always set on, to be like F16C.
+
+FromNaN32ps(nan float32) (Float16, error)   // Float16 NaN without modifying quiet bit.
+                                            // The "ps" suffix means "preserve signaling".
+                                            // Returns sNaN and ErrInvalidNaNValue if nan isn't a NaN.
+                                 
+Frombits(b16 uint16) Float16       // Float16 number corresponding to b16 (IEEE 754 binary16 rep.)
+NaN() Float16                      // Float16 of IEEE 754 binary16 not-a-number
+Inf(sign int) Float16              // Float16 of IEEE 754 binary16 infinity according to sign
+
+PrecisionFromfloat32(f32 float32) Precision  // quickly indicates exact, ..., overflow, underflow
+                                             // (inline and < 1 ns/op)
+// Exported methods
+(f Float16) Float32() float32      // float32 number converted from f16 using lossless conversion
+(f Float16) Bits() uint16          // the IEEE 754 binary16 representation of f
+(f Float16) IsNaN() bool           // true if f is not-a-number (NaN)
+(f Float16) IsQuietNaN() bool      // true if f is a quiet not-a-number (NaN)
+(f Float16) IsInf(sign int) bool   // true if f is infinite based on sign (-1=NegInf, 0=any, 1=PosInf)
+(f Float16) IsFinite() bool        // true if f is not infinite or NaN
+(f Float16) IsNormal() bool        // true if f is not zero, infinite, subnormal, or NaN.
+(f Float16) Signbit() bool         // true if f is negative or negative zero
+(f Float16) String() string        // string representation of f to satisfy fmt.Stringer interface
+```
+See [API](https://godoc.org/github.com/x448/float16) at godoc.org for more info.
+
+## Benchmarks
+Conversions (in pure Go) are around 2.65 ns/op for float16 -> float32 and float32 -> float16 on amd64. Speeds can vary depending on input value.
+
+```
+All functions have zero allocations except float16.String().
+
+FromFloat32pi-2  2.59ns ± 0%    // speed using Fromfloat32() to convert a float32 of math.Pi to Float16
+ToFloat32pi-2    2.69ns ± 0%    // speed using Float32() to convert a float16 of math.Pi to float32
+Frombits-2       0.29ns ± 5%    // speed using Frombits() to cast a uint16 to Float16
+
+PrecisionFromFloat32-2  0.29ns ± 1%  // speed using PrecisionFromfloat32() to check for overflows, etc.
+```
+
+## System Requirements
+* Tested on Go 1.11, 1.12, and 1.13 but it should also work with older versions.
+* Tested on amd64 but it should also work on all little-endian platforms supported by Go.
+
+## Special Thanks
+Special thanks to Kathryn Long (starkat99) for creating [half-rs](https://github.com/starkat99/half-rs), a very nice rust implementation of float16.
+
+## License
+Copyright (c) 2019 Montgomery Edwards⁴⁴⁸ and Faye Amacker
+
+Licensed under [MIT License](LICENSE)
diff --git a/vendor/github.com/x448/float16/float16.go b/vendor/github.com/x448/float16/float16.go
new file mode 100644
index 0000000..1a0e6da
--- /dev/null
+++ b/vendor/github.com/x448/float16/float16.go
@@ -0,0 +1,302 @@
+// Copyright 2019 Montgomery Edwards⁴⁴⁸ and Faye Amacker
+//
+// Special thanks to Kathryn Long for her Rust implementation
+// of float16 at github.com/starkat99/half-rs (MIT license)
+
+package float16
+
+import (
+	"math"
+	"strconv"
+)
+
+// Float16 represents IEEE 754 half-precision floating-point numbers (binary16).
+type Float16 uint16
+
+// Precision indicates whether the conversion to Float16 is
+// exact, subnormal without dropped bits, inexact, underflow, or overflow.
+type Precision int
+
+const (
+
+	// PrecisionExact is for non-subnormals that don't drop bits during conversion.
+	// All of these can round-trip.  Should always convert to float16.
+	PrecisionExact Precision = iota
+
+	// PrecisionUnknown is for subnormals that don't drop bits during conversion but
+	// not all of these can round-trip so precision is unknown without more effort.
+	// Only 2046 of these can round-trip and the rest cannot round-trip.
+	PrecisionUnknown
+
+	// PrecisionInexact is for dropped significand bits and cannot round-trip.
+	// Some of these are subnormals. Cannot round-trip float32->float16->float32.
+	PrecisionInexact
+
+	// PrecisionUnderflow is for Underflows. Cannot round-trip float32->float16->float32.
+	PrecisionUnderflow
+
+	// PrecisionOverflow is for Overflows. Cannot round-trip float32->float16->float32.
+	PrecisionOverflow
+)
+
+// PrecisionFromfloat32 returns Precision without performing
+// the conversion.  Conversions from both Infinity and NaN
+// values will always report PrecisionExact even if NaN payload
+// or NaN-Quiet-Bit is lost. This function is kept simple to
+// allow inlining and run < 0.5 ns/op, to serve as a fast filter.
+func PrecisionFromfloat32(f32 float32) Precision {
+	u32 := math.Float32bits(f32)
+
+	if u32 == 0 || u32 == 0x80000000 {
+		// +- zero will always be exact conversion
+		return PrecisionExact
+	}
+
+	const COEFMASK uint32 = 0x7fffff // 23 least significant bits
+	const EXPSHIFT uint32 = 23
+	const EXPBIAS uint32 = 127
+	const EXPMASK uint32 = uint32(0xff) << EXPSHIFT
+	const DROPMASK uint32 = COEFMASK >> 10
+
+	exp := int32(((u32 & EXPMASK) >> EXPSHIFT) - EXPBIAS)
+	coef := u32 & COEFMASK
+
+	if exp == 128 {
+		// +- infinity or NaN
+		// apps may want to do extra checks for NaN separately
+		return PrecisionExact
+	}
+
+	// https://en.wikipedia.org/wiki/Half-precision_floating-point_format says,
+	// "Decimals between 2^−24 (minimum positive subnormal) and 2^−14 (maximum subnormal): fixed interval 2^−24"
+	if exp < -24 {
+		return PrecisionUnderflow
+	}
+	if exp > 15 {
+		return PrecisionOverflow
+	}
+	if (coef & DROPMASK) != uint32(0) {
+		// these include subnormals and non-subnormals that dropped bits
+		return PrecisionInexact
+	}
+
+	if exp < -14 {
+		// Subnormals. Caller may want to test these further.
+		// There are 2046 subnormals that can successfully round-trip f32->f16->f32
+		// and 20 of those 2046 have 32-bit input coef == 0.
+		// RFC 7049 and 7049bis Draft 12 don't precisely define "preserves value"
+		// so some protocols and libraries will choose to handle subnormals differently
+		// when deciding to encode them to CBOR float32 vs float16.
+		return PrecisionUnknown
+	}
+
+	return PrecisionExact
+}
+
+// Frombits returns the float16 number corresponding to the IEEE 754 binary16
+// representation u16, with the sign bit of u16 and the result in the same bit
+// position. Frombits(Bits(x)) == x.
+func Frombits(u16 uint16) Float16 {
+	return Float16(u16)
+}
+
+// Fromfloat32 returns a Float16 value converted from f32. Conversion uses
+// IEEE default rounding (nearest int, with ties to even).
+func Fromfloat32(f32 float32) Float16 {
+	return Float16(f32bitsToF16bits(math.Float32bits(f32)))
+}
+
+// ErrInvalidNaNValue indicates a NaN was not received.
+const ErrInvalidNaNValue = float16Error("float16: invalid NaN value, expected IEEE 754 NaN")
+
+type float16Error string
+
+func (e float16Error) Error() string { return string(e) }
+
+// FromNaN32ps converts nan to IEEE binary16 NaN while preserving both
+// signaling and payload. Unlike Fromfloat32(), which can only return
+// qNaN because it sets quiet bit = 1, this can return both sNaN and qNaN.
+// If the result is infinity (sNaN with empty payload), then the
+// lowest bit of payload is set to make the result a NaN.
+// Returns ErrInvalidNaNValue and 0x7c01 (sNaN) if nan isn't IEEE 754 NaN.
+// This function was kept simple to be able to inline.
+func FromNaN32ps(nan float32) (Float16, error) {
+	const SNAN = Float16(uint16(0x7c01)) // signalling NaN
+
+	u32 := math.Float32bits(nan)
+	sign := u32 & 0x80000000
+	exp := u32 & 0x7f800000
+	coef := u32 & 0x007fffff
+
+	if (exp != 0x7f800000) || (coef == 0) {
+		return SNAN, ErrInvalidNaNValue
+	}
+
+	u16 := uint16((sign >> 16) | uint32(0x7c00) | (coef >> 13))
+
+	if (u16 & 0x03ff) == 0 {
+		// result became infinity, make it NaN by setting lowest bit in payload
+		u16 = u16 | 0x0001
+	}
+
+	return Float16(u16), nil
+}
+
+// NaN returns a Float16 of IEEE 754 binary16 not-a-number (NaN).
+// Returned NaN value 0x7e01 has all exponent bits = 1 with the
+// first and last bits = 1 in the significand. This is consistent
+// with Go's 64-bit math.NaN(). Canonical CBOR in RFC 7049 uses 0x7e00.
+func NaN() Float16 {
+	return Float16(0x7e01)
+}
+
+// Inf returns a Float16 with an infinity value with the specified sign.
+// A sign >= returns positive infinity.
+// A sign < 0 returns negative infinity.
+func Inf(sign int) Float16 {
+	if sign >= 0 {
+		return Float16(0x7c00)
+	}
+	return Float16(0x8000 | 0x7c00)
+}
+
+// Float32 returns a float32 converted from f (Float16).
+// This is a lossless conversion.
+func (f Float16) Float32() float32 {
+	u32 := f16bitsToF32bits(uint16(f))
+	return math.Float32frombits(u32)
+}
+
+// Bits returns the IEEE 754 binary16 representation of f, with the sign bit
+// of f and the result in the same bit position. Bits(Frombits(x)) == x.
+func (f Float16) Bits() uint16 {
+	return uint16(f)
+}
+
+// IsNaN reports whether f is an IEEE 754 binary16 “not-a-number” value.
+func (f Float16) IsNaN() bool {
+	return (f&0x7c00 == 0x7c00) && (f&0x03ff != 0)
+}
+
+// IsQuietNaN reports whether f is a quiet (non-signaling) IEEE 754 binary16
+// “not-a-number” value.
+func (f Float16) IsQuietNaN() bool {
+	return (f&0x7c00 == 0x7c00) && (f&0x03ff != 0) && (f&0x0200 != 0)
+}
+
+// IsInf reports whether f is an infinity (inf).
+// A sign > 0 reports whether f is positive inf.
+// A sign < 0 reports whether f is negative inf.
+// A sign == 0 reports whether f is either inf.
+func (f Float16) IsInf(sign int) bool {
+	return ((f == 0x7c00) && sign >= 0) ||
+		(f == 0xfc00 && sign <= 0)
+}
+
+// IsFinite returns true if f is neither infinite nor NaN.
+func (f Float16) IsFinite() bool {
+	return (uint16(f) & uint16(0x7c00)) != uint16(0x7c00)
+}
+
+// IsNormal returns true if f is neither zero, infinite, subnormal, or NaN.
+func (f Float16) IsNormal() bool {
+	exp := uint16(f) & uint16(0x7c00)
+	return (exp != uint16(0x7c00)) && (exp != 0)
+}
+
+// Signbit reports whether f is negative or negative zero.
+func (f Float16) Signbit() bool {
+	return (uint16(f) & uint16(0x8000)) != 0
+}
+
+// String satisfies the fmt.Stringer interface.
+func (f Float16) String() string {
+	return strconv.FormatFloat(float64(f.Float32()), 'f', -1, 32)
+}
+
+// f16bitsToF32bits returns uint32 (float32 bits) converted from specified uint16.
+func f16bitsToF32bits(in uint16) uint32 {
+	// All 65536 conversions with this were confirmed to be correct
+	// by Montgomery Edwards⁴⁴⁸ (github.com/x448).
+
+	sign := uint32(in&0x8000) << 16 // sign for 32-bit
+	exp := uint32(in&0x7c00) >> 10  // exponenent for 16-bit
+	coef := uint32(in&0x03ff) << 13 // significand for 32-bit
+
+	if exp == 0x1f {
+		if coef == 0 {
+			// infinity
+			return sign | 0x7f800000 | coef
+		}
+		// NaN
+		return sign | 0x7fc00000 | coef
+	}
+
+	if exp == 0 {
+		if coef == 0 {
+			// zero
+			return sign
+		}
+
+		// normalize subnormal numbers
+		exp++
+		for coef&0x7f800000 == 0 {
+			coef <<= 1
+			exp--
+		}
+		coef &= 0x007fffff
+	}
+
+	return sign | ((exp + (0x7f - 0xf)) << 23) | coef
+}
+
+// f32bitsToF16bits returns uint16 (Float16 bits) converted from the specified float32.
+// Conversion rounds to nearest integer with ties to even.
+func f32bitsToF16bits(u32 uint32) uint16 {
+	// Translated from Rust to Go by Montgomery Edwards⁴⁴⁸ (github.com/x448).
+	// All 4294967296 conversions with this were confirmed to be correct by x448.
+	// Original Rust implementation is by Kathryn Long (github.com/starkat99) with MIT license.
+
+	sign := u32 & 0x80000000
+	exp := u32 & 0x7f800000
+	coef := u32 & 0x007fffff
+
+	if exp == 0x7f800000 {
+		// NaN or Infinity
+		nanBit := uint32(0)
+		if coef != 0 {
+			nanBit = uint32(0x0200)
+		}
+		return uint16((sign >> 16) | uint32(0x7c00) | nanBit | (coef >> 13))
+	}
+
+	halfSign := sign >> 16
+
+	unbiasedExp := int32(exp>>23) - 127
+	halfExp := unbiasedExp + 15
+
+	if halfExp >= 0x1f {
+		return uint16(halfSign | uint32(0x7c00))
+	}
+
+	if halfExp <= 0 {
+		if 14-halfExp > 24 {
+			return uint16(halfSign)
+		}
+		coef := coef | uint32(0x00800000)
+		halfCoef := coef >> uint32(14-halfExp)
+		roundBit := uint32(1) << uint32(13-halfExp)
+		if (coef&roundBit) != 0 && (coef&(3*roundBit-1)) != 0 {
+			halfCoef++
+		}
+		return uint16(halfSign | halfCoef)
+	}
+
+	uHalfExp := uint32(halfExp) << 10
+	halfCoef := coef >> 13
+	roundBit := uint32(0x00001000)
+	if (coef&roundBit) != 0 && (coef&(3*roundBit-1)) != 0 {
+		return uint16((halfSign | uHalfExp | halfCoef) + 1)
+	}
+	return uint16(halfSign | uHalfExp | halfCoef)
+}