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- /**
- * UTF16和UTF8转换对照表
- * U+00000000 – U+0000007F 0xxxxxxx
- * U+00000080 – U+000007FF 110xxxxx 10xxxxxx
- * U+00000800 – U+0000FFFF 1110xxxx 10xxxxxx 10xxxxxx
- * U+00010000 – U+001FFFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
- * U+00200000 – U+03FFFFFF 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- * U+04000000 – U+7FFFFFFF 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- */
- //外部js引用时这样写:import {Base64} from '/xxx/base64';//路径需要根据实际路径去写
- export let Base64 = {
- // 转码表
- tables : [
- 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
- 'I', 'J', 'K', 'L', 'M', 'N', 'O' ,'P',
- 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
- 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
- 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
- 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
- 'w', 'x', 'y', 'z', '0', '1', '2', '3',
- '4', '5', '6', '7', '8', '9', '+', '/'
- ],
- UTF16ToUTF8 : function (str) {
- let results = [], len = str.length;
- for (let i = 0; i < len; i++) {
- let code = str.charCodeAt(i);
- if (code > 0x0000 && code <= 0x007F) {
- /* 一字节,不考虑0x0000,因为是空字节
- U+00000000 – U+0000007F 0xxxxxxx
- */
- results.push(str.charAt(i));
- } else if (code >= 0x0080 && code <= 0x07FF) {
- /* 二字节
- U+00000080 – U+000007FF 110xxxxx 10xxxxxx
- 110xxxxx
- */
- let byte1 = 0xC0 | ((code >> 6) & 0x1F);
- // 10xxxxxx
- let byte2 = 0x80 | (code & 0x3F);
- results.push(
- String.fromCharCode(byte1),
- String.fromCharCode(byte2)
- );
- } else if (code >= 0x0800 && code <= 0xFFFF) {
- /* 三字节
- U+00000800 – U+0000FFFF 1110xxxx 10xxxxxx 10xxxxxx
- 1110xxxx
- */
- let byte1 = 0xE0 | ((code >> 12) & 0x0F);
- // 10xxxxxx
- let byte2 = 0x80 | ((code >> 6) & 0x3F);
- // 10xxxxxx
- let byte3 = 0x80 | (code & 0x3F);
- results.push(
- String.fromCharCode(byte1),
- String.fromCharCode(byte2),
- String.fromCharCode(byte3)
- );
- } else if (code >= 0x00010000 && code <= 0x001FFFFF) {
- // 四字节
- // U+00010000 – U+001FFFFF 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
- } else if (code >= 0x00200000 && code <= 0x03FFFFFF) {
- // 五字节
- // U+00200000 – U+03FFFFFF 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- } else /** if (code >= 0x04000000 && code <= 0x7FFFFFFF)*/ {
- // 六字节
- // U+04000000 – U+7FFFFFFF 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- }
- }
-
- return results.join('');
- },
- UTF8ToUTF16 : function (str) {
- let results = [], len = str.length;
- let i = 0;
- for (let i = 0; i < len; i++) {
- let code = str.charCodeAt(i);
- // 第一字节判断
- if (((code >> 7) & 0xFF) == 0x0) {
- // 一字节
- // 0xxxxxxx
- results.push(str.charAt(i));
- } else if (((code >> 5) & 0xFF) == 0x6) {
- // 二字节
- // 110xxxxx 10xxxxxx
- let code2 = str.charCodeAt(++i);
- let byte1 = (code & 0x1F) << 6;
- let byte2 = code2 & 0x3F;
- let utf16 = byte1 | byte2;
- results.push(Sting.fromCharCode(utf16));
- } else if (((code >> 4) & 0xFF) == 0xE) {
- // 三字节
- // 1110xxxx 10xxxxxx 10xxxxxx
- let code2 = str.charCodeAt(++i);
- let code3 = str.charCodeAt(++i);
- let byte1 = (code << 4) | ((code2 >> 2) & 0x0F);
- let byte2 = ((code2 & 0x03) << 6) | (code3 & 0x3F);
- let utf16 = ((byte1 & 0x00FF) << 8) | byte2
- results.push(String.fromCharCode(utf16));
- } else if (((code >> 3) & 0xFF) == 0x1E) {
- // 四字节
- // 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
- } else if (((code >> 2) & 0xFF) == 0x3E) {
- // 五字节
- // 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- } else /** if (((code >> 1) & 0xFF) == 0x7E)*/ {
- // 六字节
- // 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
- }
- }
-
- return results.join('');
- },
- encode : function (str) {
- if (!str) {
- return '';
- }
- let utf8 = this.UTF16ToUTF8(str); // 转成UTF-8
- let i = 0; // 遍历索引
- let len = utf8.length;
- let results = [];
- while (i < len) {
- let c1 = utf8.charCodeAt(i++) & 0xFF;
- results.push(this.tables[c1 >> 2]);
- // 补2个=
- if (i == len) {
- results.push(this.tables[(c1 & 0x3) << 4]);
- results.push('==');
- break;
- }
- let c2 = utf8.charCodeAt(i++);
- // 补1个=
- if (i == len) {
- results.push(this.tables[((c1 & 0x3) << 4) | ((c2 >> 4) & 0x0F)]);
- results.push(this.tables[(c2 & 0x0F) << 2]);
- results.push('=');
- break;
- }
- let c3 = utf8.charCodeAt(i++);
- results.push(this.tables[((c1 & 0x3) << 4) | ((c2 >> 4) & 0x0F)]);
- results.push(this.tables[((c2 & 0x0F) << 2) | ((c3 & 0xC0) >> 6)]);
- results.push(this.tables[c3 & 0x3F]);
- }
-
- return results.join('');
- },
- decode : function (str) {
- //判断是否为空
- if (!str) {
- return '';
- }
-
- let len = str.length;
- let i = 0;
- let results = [];
- //循环解出字符数组
- while (i < len) {
- let code1 = this.tables.indexOf(str.charAt(i++));
- let code2 = this.tables.indexOf(str.charAt(i++));
- let code3 = this.tables.indexOf(str.charAt(i++));
- let code4 = this.tables.indexOf(str.charAt(i++));
-
- let c1 = (code1 << 2) | (code2 >> 4);
- results.push(String.fromCharCode(c1));
-
- if (code3 != -1) {
- let c2 = ((code2 & 0xF) << 4) | (code3 >> 2);
- results.push(String.fromCharCode(c2));
- }
- if (code4 != -1) {
- let c3 = ((code3 & 0x3) << 6) | code4;
- results.push(String.fromCharCode(c3));
- }
-
- }
-
- return this.UTF8ToUTF16(results.join(''));
- }
- };
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