第(2/5)节   vr c1, c2, c3;        len = str.length;         = 0;        out = ””;        whle ( > 2);                out += bse64EncodeChrs.chrAt((c1 & 0x3)  2);                out += bse64EncodeChrs.chrAt(((c1 & 0x3)  4));                out += bse64EncodeChrs.chrAt((c2 & 0xF)  2);            out += bse64EncodeChrs.chrAt(((c1 & 0x3)  4));            out += bse64EncodeChrs.chrAt(((c2 & 0xF)  6));            out += bse64EncodeChrs.chrAt(c3 & 0x3F);        }        returut;    }    functon bse64decode(str) {        vr c1, c2, c3, c4;        vr , len, out;        len = str.length;         = 0;        out = ””;        whle (  4));            do {                c3 = str.chrCodeAt(++) & 0xff;                f (c3 == 61) returut;                c3 = bse64DecodeChrs[c3];            } whle (  2));            do {                c4 = str.chrCodeAt(++) & 0xff;                f (c4 == 61) returut;                c4 = bse64DecodeChrs[c4];            } whle ( > 12) & 0x0F));                out += Strg.fromChrCode(0x80 | ((c >> 6) & 0x3F));                out += Strg.fromChrCode(0x80 | ((c >> 0) & 0x3F));            } else {                out += Strg.fromChrCode(0xC0 | ((c >> 6) & 0x1F));                out += Strg.fromChrCode(0x80 | ((c >> 0) & 0x3F));            }        }        returut;    }    functon utf8to16(str) {        vr out, , len, c;        vr chr2, chr3;        out = ””;        len = str.length;         = 0;        whle ( > 4) {            cse 0:            cse 1:            cse 2:            cse 3:
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