优化64进制转换
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@@ -1,6 +1,8 @@
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package convx
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import (
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"errors"
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"fmt"
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"strings"
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)
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@@ -8,13 +10,17 @@ import (
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// 10进制的数字转换为64进制的字符串,用于生成短链接
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// 64进制的字符集,可以自定义
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const base64 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz+/"
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const base64 = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz#*"
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// DecToBase64 将10进制的数字转换为64进制的字符串
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func Encode10To64(n int) string {
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if n == 0 {
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return "0"
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func Encode10To64(n int64) (string, error) {
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if n < 0 {
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return "", fmt.Errorf("n must be positive")
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}
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if n == 0 {
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return "0", nil
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}
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s := ""
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for n > 0 {
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// 取余数,作为64进制的一位
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@@ -26,22 +32,21 @@ func Encode10To64(n int) string {
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// 除以64,继续下一轮循环
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n = n / 64
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}
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return s
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return s, nil
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}
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// Base64ToDec 将64进制的字符串转换为10进制的数字
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func Decode64To10(s string) int {
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n := 0
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func Decode64To10(s string) (int64, error) {
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n := int64(0)
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// 遍历字符串的每个字符
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for _, c := range s {
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// 在字符集中找到字符的索引,作为64进制的一位
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i := strings.Index(base64, string(c))
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if i == -1 {
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// 如果字符不在字符集中,返回-1表示错误
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return -1
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return 0, errors.New("invalid character: " + string(c))
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}
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// 累加到结果数字中,每次乘以64
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n = n*64 + i
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n = n*64 + int64(i)
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}
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return n
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return n, nil
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}
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