59 lines
2.4 KiB
JavaScript
59 lines
2.4 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.encode = exports.encodeTe = exports.encodeNative = exports.encodeFrom = exports.encodeUtf8Write = void 0;
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const hasBuffer = typeof Buffer !== undefined;
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const utf8Write = hasBuffer
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? Buffer.prototype.utf8Write
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: null;
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const from = hasBuffer ? Buffer.from : null;
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const encodeUtf8Write = (arr, str, pos, maxLength) => utf8Write.call(arr, str, pos, maxLength);
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exports.encodeUtf8Write = encodeUtf8Write;
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const encodeFrom = (arr, str, pos, maxLength) => {
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const offset = arr.byteOffset + pos;
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const buf = from(arr.buffer).subarray(offset, offset + maxLength);
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return buf.write(str, 0, maxLength, 'utf8');
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};
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exports.encodeFrom = encodeFrom;
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const encodeNative = (arr, str, pos, maxLength) => {
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const length = str.length;
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const start = pos;
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let curr = 0;
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while (curr < length) {
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let value = str.charCodeAt(curr++);
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if ((value & 0xffffff80) === 0) {
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arr[pos++] = value;
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continue;
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}
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else if ((value & 0xfffff800) === 0) {
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arr[pos++] = ((value >> 6) & 0x1f) | 0xc0;
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}
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else {
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if (value >= 0xd800 && value <= 0xdbff) {
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if (curr < length) {
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const extra = str.charCodeAt(curr);
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if ((extra & 0xfc00) === 0xdc00) {
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curr++;
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value = ((value & 0x3ff) << 10) + (extra & 0x3ff) + 0x10000;
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}
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}
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}
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if ((value & 0xffff0000) === 0) {
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arr[pos++] = ((value >> 12) & 0x0f) | 0xe0;
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arr[pos++] = ((value >> 6) & 0x3f) | 0x80;
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}
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else {
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arr[pos++] = ((value >> 18) & 0x07) | 0xf0;
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arr[pos++] = ((value >> 12) & 0x3f) | 0x80;
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arr[pos++] = ((value >> 6) & 0x3f) | 0x80;
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}
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}
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arr[pos++] = (value & 0x3f) | 0x80;
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}
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return pos - start;
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};
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exports.encodeNative = encodeNative;
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const textEncoder = typeof TextEncoder !== 'undefined' ? new TextEncoder() : null;
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const encodeTe = (arr, str, pos, maxLength) => textEncoder.encodeInto(str, arr.subarray(pos, pos + maxLength)).written;
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exports.encodeTe = encodeTe;
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exports.encode = utf8Write ? exports.encodeUtf8Write : from ? exports.encodeFrom : exports.encodeNative;
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//# sourceMappingURL=encode.js.map
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