server: Move all the top level files into cmd folder. (#2490)

This change brings a change which was done for the 'mc'
package to allow for clean repo and have a cleaner
github drop in experience.

cmd/strconv-bytes.go

@@ -0,0 +1,117 @@
+/*
+ * Minio Cloud Storage, (C) 2016 Minio, 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,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package cmd
+
+import (
+	"fmt"
+	"math"
+	"strconv"
+	"strings"
+	"unicode"
+)
+
+// IEC Sizes, kibis of bits
+const (
+	Byte = 1 << (iota * 10)
+	KiByte
+	MiByte
+	GiByte
+	TiByte
+	PiByte
+	EiByte
+)
+
+// Scientific notation Sizes.
+const (
+	IByte = 1
+	KByte = IByte * 1000
+	MByte = KByte * 1000
+	GByte = MByte * 1000
+	TByte = GByte * 1000
+	PByte = TByte * 1000
+	EByte = PByte * 1000
+)
+
+// This table represents both IEC and SI notations with their corresponding values.
+var bytesSizeTable = map[string]uint64{
+	"b":   Byte,
+	"kib": KiByte,
+	"kb":  KByte,
+	"mib": MiByte,
+	"mb":  MByte,
+	"gib": GiByte,
+	"gb":  GByte,
+	"tib": TiByte,
+	"tb":  TByte,
+	"pib": PiByte,
+	"pb":  PByte,
+	"eib": EiByte,
+	"eb":  EByte,
+	// Without suffix
+	"":   Byte,
+	"ki": KiByte,
+	"k":  KByte,
+	"mi": MiByte,
+	"m":  MByte,
+	"gi": GiByte,
+	"g":  GByte,
+	"ti": TiByte,
+	"t":  TByte,
+	"pi": PiByte,
+	"p":  PByte,
+	"ei": EiByte,
+	"e":  EByte,
+}
+
+// strconvBytes parses a string representation of bytes into the number
+// of bytes it represents.
+//
+// See Also: Bytes, IBytes.
+//
+// ParseBytes("42MB") -> 42000000, nil
+// ParseBytes("42mib") -> 44040192, nil
+func strconvBytes(s string) (uint64, error) {
+	lastDigit := 0
+	// Calculates the final integer value.
+	for _, r := range s {
+		// This supports decimals as well.
+		if !(unicode.IsDigit(r) || r == '.') {
+			break
+		}
+		lastDigit++
+	}
+
+	// Float parsing to deal with decimal inputs.
+	f, err := strconv.ParseFloat(s[:lastDigit], 64)
+	if err != nil {
+		return 0, err
+	}
+
+	// Fetch the corresponding byte size for notation.
+	byteSize := strings.ToLower(strings.TrimSpace(s[lastDigit:]))
+	size, ok := bytesSizeTable[byteSize]
+	if !ok {
+		return 0, fmt.Errorf("Unrecognized size notation name: %v", byteSize)
+	}
+	f *= float64(size)
+	// Return an error if final value overflows uint64 max.
+	if f >= math.MaxUint64 {
+		return 0, fmt.Errorf("too large: %v", s)
+	}
+	// Success.
+	return uint64(f), nil
+}