50 lines
1.7 KiB
TypeScript
50 lines
1.7 KiB
TypeScript
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export class convert {
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stringToByte(str) {
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var bytes = new Array();
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var len, c;
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len = str.length;
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for (var i = 0; i < len; i++) {
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c = str.charCodeAt(i);
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if (c >= 0x010000 && c <= 0x10FFFF) {
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bytes.push(((c >> 18) & 0x07) | 0xF0);
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bytes.push(((c >> 12) & 0x3F) | 0x80);
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bytes.push(((c >> 6) & 0x3F) | 0x80);
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bytes.push((c & 0x3F) | 0x80);
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} else if (c >= 0x000800 && c <= 0x00FFFF) {
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bytes.push(((c >> 12) & 0x0F) | 0xE0);
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bytes.push(((c >> 6) & 0x3F) | 0x80);
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bytes.push((c & 0x3F) | 0x80);
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} else if (c >= 0x000080 && c <= 0x0007FF) {
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bytes.push(((c >> 6) & 0x1F) | 0xC0);
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bytes.push((c & 0x3F) | 0x80);
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} else {
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bytes.push(c & 0xFF);
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}
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}
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return bytes;
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}
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byteToString(arr) {
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if (typeof arr === 'string') {
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return arr;
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}
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var str = '', _arr = arr;
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for (var i = 0; i < _arr.length; i++) {
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var one = _arr[i].toString(2), v = one.match(/^1+?(?=0)/);
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if (v && one.length == 8) {
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var bytesLength = v[0].length;
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var store = _arr[i].toString(2).slice(7 - bytesLength);
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for (var st = 1; st < bytesLength; st++) {
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store += _arr[st + i].toString(2).slice(2);
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}
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str += String.fromCharCode(parseInt(store, 2));
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i += bytesLength - 1;
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} else {
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str += String.fromCharCode(_arr[i]);
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}
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}
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return str;
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}
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} |