【杜林的秘密】（7）

4, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);functon bse64encode(str) {vr out, , len;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));}