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.svn/pristine/d8/d85a410b3f753b8db98c4342a8078aa3838834fa.svn-base

@@ -0,0 +1,119 @@
+/*
+一个处理不同进制的工具包；用于将十进制和其它进制进行互相转换
+*/
+package baseUtil
+
+import (
+	"fmt"
+	"math"
+)
+
+// 进制对象定义
+type Base struct {
+	elementList []string
+	base        uint64
+}
+
+// 将10进制的uint64类型数据转换为字符串形式
+// source:10进制的uint64类型数据
+// 返回值:
+// 对应进制的字符串形式
+func (this *Base) Transform(source uint64) (result string) {
+	quotient, remainder := uint64(0), source
+
+	for {
+		quotient, remainder = remainder/this.base, remainder%this.base
+		result = this.elementList[remainder] + result
+		if quotient == 0 {
+			break
+		}
+		remainder = quotient
+	}
+
+	return
+}
+
+// 将字符串解析为10进制的uint64类型
+// source:对应进制的字符串形式
+// 返回值:10进制的uint64类型数据
+func (this *Base) Parse(source string) (result uint64) {
+	if source == "" {
+		return
+	}
+
+	sourceList := make([]string, 0, len(source))
+	for _, v := range source {
+		sourceList = append(sourceList, string(v))
+	}
+
+	for idx, exp := len(sourceList)-1, 0; idx >= 0; idx, exp = idx-1, exp+1 {
+		sourceItem := sourceList[idx]
+
+		// Find the source item in the elementList
+		for i, v := range this.elementList {
+			if sourceItem == v {
+				result += uint64(float64(i) * math.Pow(float64(this.base), float64(exp)))
+				break
+			}
+		}
+	}
+
+	return
+}
+
+// 以指定的任意非重复的数组，来指定基于的进制数
+func New(elements string) (baseObj *Base, err error) {
+	if len(elements) == 0 {
+		err = fmt.Errorf("输入的字符数串为空")
+		return
+	}
+
+	elementList := make([]string, 0, len(elements))
+	elementMap := make(map[rune]struct{}, len(elements))
+	for _, v := range elements {
+		if _, exist := elementMap[v]; exist {
+			err = fmt.Errorf("输入的字符串中含有重复的字符:%s", string(v))
+			return
+		} else {
+			elementMap[v] = struct{}{}
+			elementList = append(elementList, string(v))
+		}
+	}
+
+	baseObj = &Base{
+		elementList: elementList,
+		base:        uint64(len(elementList)),
+	}
+
+	return
+}
+
+// 包含01
+func NewBase2() (baseObj *Base, err error) {
+	return New("01")
+}
+
+// 包含0-7
+func NewBase8() (baseObj *Base, err error) {
+	return New("01234567")
+}
+
+// 包含0-9,a-x
+func NewBase16() (baseObj *Base, err error) {
+	return New("0123456789abcdef")
+}
+
+// 包含a-z
+func NewBase26() (baseObj *Base, err error) {
+	return New("abcdefghijklmnopqrstuvwxyz")
+}
+
+// 包含0-9,a-z
+func NewBase36() (baseObj *Base, err error) {
+	return New("0123456789abcdefghijklmnopqrstuvwxyz")
+}
+
+// 包含0-9,a-z,A-Z
+func NewBase62() (baseObj *Base, err error) {
+	return New("0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+}