Integrate public as bindata optionally (#293)

* Dropped unused codekit config

* Integrated dynamic and static bindata for public

* Ignore public bindata

* Add a general generate make task

* Integrated flexible public assets into web command

* Updated vendoring, added all missiong govendor deps

* Made the linter happy with the bindata and dynamic code

* Moved public bindata definition to modules directory

* Ignoring the new bindata path now

* Updated to the new public modules import path

* Updated public bindata command and drop the new prefix

vendor/github.com/pingcap/tidb/util/codec/float.go

@@ -0,0 +1,65 @@
+// Copyright 2015 PingCAP, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package codec
+
+import (
+	"math"
+
+	"github.com/juju/errors"
+)
+
+func encodeFloatToCmpUint64(f float64) uint64 {
+	u := math.Float64bits(f)
+	if f >= 0 {
+		u |= signMask
+	} else {
+		u = ^u
+	}
+	return u
+}
+
+func decodeCmpUintToFloat(u uint64) float64 {
+	if u&signMask > 0 {
+		u &= ^signMask
+	} else {
+		u = ^u
+	}
+	return math.Float64frombits(u)
+}
+
+// EncodeFloat encodes a float v into a byte slice which can be sorted lexicographically later.
+// EncodeFloat guarantees that the encoded value is in ascending order for comparison.
+func EncodeFloat(b []byte, v float64) []byte {
+	u := encodeFloatToCmpUint64(v)
+	return EncodeUint(b, u)
+}
+
+// DecodeFloat decodes a float from a byte slice generated with EncodeFloat before.
+func DecodeFloat(b []byte) ([]byte, float64, error) {
+	b, u, err := DecodeUint(b)
+	return b, decodeCmpUintToFloat(u), errors.Trace(err)
+}
+
+// EncodeFloatDesc encodes a float v into a byte slice which can be sorted lexicographically later.
+// EncodeFloatDesc guarantees that the encoded value is in descending order for comparison.
+func EncodeFloatDesc(b []byte, v float64) []byte {
+	u := encodeFloatToCmpUint64(v)
+	return EncodeUintDesc(b, u)
+}
+
+// DecodeFloatDesc decodes a float from a byte slice generated with EncodeFloatDesc before.
+func DecodeFloatDesc(b []byte) ([]byte, float64, error) {
+	b, u, err := DecodeUintDesc(b)
+	return b, decodeCmpUintToFloat(u), errors.Trace(err)
+}