mirror of
https://github.com/swc-project/swc.git
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325 lines
8.3 KiB
TypeScript
325 lines
8.3 KiB
TypeScript
// Loaded from https://dev.jspm.io/npm:jszip@3.5.0/lib/utf8.dew.js
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import { dew as _utilsDewDew } from "./utils.dew.js";
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import { dew as _supportDewDew } from "./support.dew.js";
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import { dew as _nodejsUtilsDewDew } from "./nodejsUtils.dew.js";
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import { dew as _GenericWorkerDewDew } from "./stream/GenericWorker.dew.js";
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var exports = {},
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_dewExec = false;
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export function dew() {
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if (_dewExec) return exports;
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_dewExec = true;
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var utils = _utilsDewDew();
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var support = _supportDewDew();
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var nodejsUtils = _nodejsUtilsDewDew();
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var GenericWorker = _GenericWorkerDewDew();
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/**
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* The following functions come from pako, from pako/lib/utils/strings
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* released under the MIT license, see pako https://github.com/nodeca/pako/
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*/
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// Table with utf8 lengths (calculated by first byte of sequence)
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// Note, that 5 & 6-byte values and some 4-byte values can not be represented in JS,
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// because max possible codepoint is 0x10ffff
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var _utf8len = new Array(256);
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for (var i = 0; i < 256; i++) {
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_utf8len[i] = i >= 252 ? 6 : i >= 248 ? 5 : i >= 240 ? 4 : i >= 224 ? 3 : i >= 192 ? 2 : 1;
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}
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_utf8len[254] = _utf8len[254] = 1; // Invalid sequence start
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// convert string to array (typed, when possible)
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var string2buf = function (str) {
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var buf,
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c,
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c2,
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m_pos,
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i,
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str_len = str.length,
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buf_len = 0; // count binary size
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for (m_pos = 0; m_pos < str_len; m_pos++) {
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c = str.charCodeAt(m_pos);
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if ((c & 0xfc00) === 0xd800 && m_pos + 1 < str_len) {
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c2 = str.charCodeAt(m_pos + 1);
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if ((c2 & 0xfc00) === 0xdc00) {
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c = 0x10000 + (c - 0xd800 << 10) + (c2 - 0xdc00);
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m_pos++;
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}
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}
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buf_len += c < 0x80 ? 1 : c < 0x800 ? 2 : c < 0x10000 ? 3 : 4;
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} // allocate buffer
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if (support.uint8array) {
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buf = new Uint8Array(buf_len);
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} else {
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buf = new Array(buf_len);
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} // convert
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for (i = 0, m_pos = 0; i < buf_len; m_pos++) {
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c = str.charCodeAt(m_pos);
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if ((c & 0xfc00) === 0xd800 && m_pos + 1 < str_len) {
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c2 = str.charCodeAt(m_pos + 1);
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if ((c2 & 0xfc00) === 0xdc00) {
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c = 0x10000 + (c - 0xd800 << 10) + (c2 - 0xdc00);
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m_pos++;
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}
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}
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if (c < 0x80) {
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/* one byte */
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buf[i++] = c;
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} else if (c < 0x800) {
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/* two bytes */
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buf[i++] = 0xC0 | c >>> 6;
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buf[i++] = 0x80 | c & 0x3f;
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} else if (c < 0x10000) {
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/* three bytes */
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buf[i++] = 0xE0 | c >>> 12;
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buf[i++] = 0x80 | c >>> 6 & 0x3f;
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buf[i++] = 0x80 | c & 0x3f;
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} else {
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/* four bytes */
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buf[i++] = 0xf0 | c >>> 18;
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buf[i++] = 0x80 | c >>> 12 & 0x3f;
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buf[i++] = 0x80 | c >>> 6 & 0x3f;
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buf[i++] = 0x80 | c & 0x3f;
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}
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}
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return buf;
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}; // Calculate max possible position in utf8 buffer,
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// that will not break sequence. If that's not possible
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// - (very small limits) return max size as is.
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//
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// buf[] - utf8 bytes array
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// max - length limit (mandatory);
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var utf8border = function (buf, max) {
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var pos;
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max = max || buf.length;
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if (max > buf.length) {
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max = buf.length;
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} // go back from last position, until start of sequence found
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pos = max - 1;
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while (pos >= 0 && (buf[pos] & 0xC0) === 0x80) {
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pos--;
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} // Fuckup - very small and broken sequence,
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// return max, because we should return something anyway.
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if (pos < 0) {
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return max;
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} // If we came to start of buffer - that means vuffer is too small,
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// return max too.
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if (pos === 0) {
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return max;
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}
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return pos + _utf8len[buf[pos]] > max ? pos : max;
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}; // convert array to string
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var buf2string = function (buf) {
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var str, i, out, c, c_len;
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var len = buf.length; // Reserve max possible length (2 words per char)
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// NB: by unknown reasons, Array is significantly faster for
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// String.fromCharCode.apply than Uint16Array.
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var utf16buf = new Array(len * 2);
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for (out = 0, i = 0; i < len;) {
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c = buf[i++]; // quick process ascii
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if (c < 0x80) {
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utf16buf[out++] = c;
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continue;
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}
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c_len = _utf8len[c]; // skip 5 & 6 byte codes
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if (c_len > 4) {
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utf16buf[out++] = 0xfffd;
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i += c_len - 1;
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continue;
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} // apply mask on first byte
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c &= c_len === 2 ? 0x1f : c_len === 3 ? 0x0f : 0x07; // join the rest
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while (c_len > 1 && i < len) {
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c = c << 6 | buf[i++] & 0x3f;
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c_len--;
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} // terminated by end of string?
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if (c_len > 1) {
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utf16buf[out++] = 0xfffd;
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continue;
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}
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if (c < 0x10000) {
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utf16buf[out++] = c;
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} else {
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c -= 0x10000;
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utf16buf[out++] = 0xd800 | c >> 10 & 0x3ff;
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utf16buf[out++] = 0xdc00 | c & 0x3ff;
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}
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} // shrinkBuf(utf16buf, out)
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if (utf16buf.length !== out) {
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if (utf16buf.subarray) {
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utf16buf = utf16buf.subarray(0, out);
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} else {
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utf16buf.length = out;
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}
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} // return String.fromCharCode.apply(null, utf16buf);
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return utils.applyFromCharCode(utf16buf);
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}; // That's all for the pako functions.
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/**
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* Transform a javascript string into an array (typed if possible) of bytes,
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* UTF-8 encoded.
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* @param {String} str the string to encode
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* @return {Array|Uint8Array|Buffer} the UTF-8 encoded string.
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*/
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exports.utf8encode = function utf8encode(str) {
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if (support.nodebuffer) {
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return nodejsUtils.newBufferFrom(str, "utf-8");
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}
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return string2buf(str);
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};
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/**
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* Transform a bytes array (or a representation) representing an UTF-8 encoded
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* string into a javascript string.
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* @param {Array|Uint8Array|Buffer} buf the data de decode
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* @return {String} the decoded string.
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*/
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exports.utf8decode = function utf8decode(buf) {
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if (support.nodebuffer) {
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return utils.transformTo("nodebuffer", buf).toString("utf-8");
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}
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buf = utils.transformTo(support.uint8array ? "uint8array" : "array", buf);
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return buf2string(buf);
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};
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/**
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* A worker to decode utf8 encoded binary chunks into string chunks.
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* @constructor
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*/
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function Utf8DecodeWorker() {
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GenericWorker.call(this, "utf-8 decode"); // the last bytes if a chunk didn't end with a complete codepoint.
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this.leftOver = null;
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}
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utils.inherits(Utf8DecodeWorker, GenericWorker);
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/**
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* @see GenericWorker.processChunk
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*/
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Utf8DecodeWorker.prototype.processChunk = function (chunk) {
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var data = utils.transformTo(support.uint8array ? "uint8array" : "array", chunk.data); // 1st step, re-use what's left of the previous chunk
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if (this.leftOver && this.leftOver.length) {
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if (support.uint8array) {
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var previousData = data;
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data = new Uint8Array(previousData.length + this.leftOver.length);
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data.set(this.leftOver, 0);
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data.set(previousData, this.leftOver.length);
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} else {
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data = this.leftOver.concat(data);
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}
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this.leftOver = null;
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}
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var nextBoundary = utf8border(data);
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var usableData = data;
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if (nextBoundary !== data.length) {
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if (support.uint8array) {
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usableData = data.subarray(0, nextBoundary);
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this.leftOver = data.subarray(nextBoundary, data.length);
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} else {
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usableData = data.slice(0, nextBoundary);
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this.leftOver = data.slice(nextBoundary, data.length);
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}
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}
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this.push({
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data: exports.utf8decode(usableData),
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meta: chunk.meta
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});
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};
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/**
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* @see GenericWorker.flush
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*/
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Utf8DecodeWorker.prototype.flush = function () {
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if (this.leftOver && this.leftOver.length) {
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this.push({
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data: exports.utf8decode(this.leftOver),
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meta: {}
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});
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this.leftOver = null;
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}
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};
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exports.Utf8DecodeWorker = Utf8DecodeWorker;
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/**
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* A worker to endcode string chunks into utf8 encoded binary chunks.
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* @constructor
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*/
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function Utf8EncodeWorker() {
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GenericWorker.call(this, "utf-8 encode");
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}
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utils.inherits(Utf8EncodeWorker, GenericWorker);
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/**
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* @see GenericWorker.processChunk
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*/
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Utf8EncodeWorker.prototype.processChunk = function (chunk) {
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this.push({
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data: exports.utf8encode(chunk.data),
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meta: chunk.meta
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});
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};
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exports.Utf8EncodeWorker = Utf8EncodeWorker;
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return exports;
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} |