【战场的女武神】（26-30）

t ””;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:cse 4:cse 5:cse 6:cse 7:out + str.chrat( - 1);brek;cse 12:cse 13:chr2 str.ch