43 lines
948 B
Go
43 lines
948 B
Go
package Util
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import (
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"fmt"
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"os"
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)
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func getbyte(a byte)int{
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x := int(a)
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if x > 255 {
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fmt.Println("INVALID_CHARACTER_ERR: DOM Exception 5")
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os.Exit(3)
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}
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return x
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}
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func Base64(s []byte)string{
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const ALPHA = "LVoJPiCN2R8G90yg+hmFHuacZ1OWMnrsSTXkYpUq/3dlbfKwv6xztjI7DeBE45QA"
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const PADCHAR = "="
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i:=0
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b10:=0
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var x []byte
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imax:=len(s)-len(s)%3
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if len(s)==0{
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return ""
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}
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for i:=0;i<imax;i+=3{
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b10=(getbyte(s[i])<<16)|(getbyte(s[i+1]) << 8)|(getbyte(s[i+2]))
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x=append(x,ALPHA[(b10>>18)])
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x=append(x,ALPHA[((b10 >> 12) & 63)])
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x=append(x,ALPHA[((b10 >> 6) & 63)])
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x=append(x,ALPHA[(b10 & 63)])
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}
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i=imax
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if len(s)-imax==1{
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b10=getbyte(s[i])<<16
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x=append(x,ALPHA[(b10 >> 18)],ALPHA[((b10 >> 12) & 63)],PADCHAR[0],PADCHAR[0])
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}else if len(s)-imax ==2{
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b10=(getbyte(s[i])<<16)|(getbyte(s[i+1])<<8)
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x=append(x,ALPHA[(b10 >> 18)],ALPHA[((b10 >> 12) & 63)],ALPHA[((b10 >> 6) & 63)],PADCHAR[0])
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}
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return string(x)
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} |