44 lines
999 B
Go
44 lines
999 B
Go
package Util
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import (
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"log"
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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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log.Println("INVALID_CHARACTER_ERR: DOM Exception 5")
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os.Exit(1)
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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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}
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