node/lib/internal/querystring.js at 78dc5c42e5da7265ba9ef5416c018997f58aee9e · nodejs/node · GitHub

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'use strict';

const {
  Array,
  ArrayPrototypeJoin,
  ArrayPrototypePush,
  Int8Array,
  NumberPrototypeToString,
  StringPrototypeCharCodeAt,
  StringPrototypeSlice,
  StringPrototypeToUpperCase,
} = primordials;

const { ERR_INVALID_URI } = require('internal/errors').codes;

const hexTable = new Array(256);
for (let i = 0; i < 256; ++i)
  hexTable[i] = '%' +
                StringPrototypeToUpperCase((i < 16 ? '0' : '') +
                                           NumberPrototypeToString(i, 16));

const isHexTable = new Int8Array([
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 0 - 15
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 16 - 31
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 32 - 47
  1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 48 - 63
  0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 64 - 79
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80 - 95
  0, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 96 - 111
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 112 - 127
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 128 ...
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // ... 256
]);

/**
 * @param {string} str
 * @param {Int8Array} noEscapeTable
 * @param {string[]} hexTable
 * @returns {string}
 */
function encodeStr(str, noEscapeTable, hexTable) {
  const len = str.length;
  if (len === 0)
    return '';

  if (len < 10) {
    let out = '';
    let lastPos = 0;
    for (let i = 0; i < len; i++) {
      const c = StringPrototypeCharCodeAt(str, i);
      if (c < 0x80) {
        if (noEscapeTable[c] !== 1) {
          if (lastPos < i)
            out += StringPrototypeSlice(str, lastPos, i);
          lastPos = i + 1;
          out += hexTable[c];
        }
      } else {
        out = undefined;
        break;
      }
    }
    if (out !== undefined) {
      if (lastPos === 0)
        return str;
      if (lastPos < len)
        out += StringPrototypeSlice(str, lastPos);
      return out;
    }
  }

  let out = [];
  let lastPos = 0;
  let i = 0;

  outer:
  for (; i < len; i++) {
    let c = StringPrototypeCharCodeAt(str, i);

    // ASCII
    while (c < 0x80) {
      if (noEscapeTable[c] !== 1) {
        if (lastPos < i)
          ArrayPrototypePush(out, StringPrototypeSlice(str, lastPos, i));
        lastPos = i + 1;
        ArrayPrototypePush(out, hexTable[c]);
      }

      if (++i === len)
        break outer;

      c = StringPrototypeCharCodeAt(str, i);
    }

    if (lastPos < i)
      ArrayPrototypePush(out, StringPrototypeSlice(str, lastPos, i));

    // Multi-byte characters ...
    if (c < 0x800) {
      lastPos = i + 1;
      ArrayPrototypePush(out, hexTable[0xC0 | (c >> 6)]);
      ArrayPrototypePush(out, hexTable[0x80 | (c & 0x3F)]);
      continue;
    }
    if (c < 0xD800 || c >= 0xE000) {
      lastPos = i + 1;
      ArrayPrototypePush(out, hexTable[0xE0 | (c >> 12)]);
      ArrayPrototypePush(out, hexTable[0x80 | ((c >> 6) & 0x3F)]);
      ArrayPrototypePush(out, hexTable[0x80 | (c & 0x3F)]);
      continue;
    }
    // Surrogate pair
    ++i;

    // This branch should never happen because all URLSearchParams entries
    // should already be converted to USVString. But, included for
    // completion's sake anyway.
    if (i >= len)
      throw new ERR_INVALID_URI();

    const c2 = StringPrototypeCharCodeAt(str, i) & 0x3FF;

    lastPos = i + 1;
    c = 0x10000 + (((c & 0x3FF) << 10) | c2);
    ArrayPrototypePush(out, hexTable[0xF0 | (c >> 18)]);
    ArrayPrototypePush(out, hexTable[0x80 | ((c >> 12) & 0x3F)]);
    ArrayPrototypePush(out, hexTable[0x80 | ((c >> 6) & 0x3F)]);
    ArrayPrototypePush(out, hexTable[0x80 | (c & 0x3F)]);
  }
  if (lastPos === 0)
    return str;
  if (lastPos < len)
    ArrayPrototypePush(out, StringPrototypeSlice(str, lastPos));
  return ArrayPrototypeJoin(out, '');
}

module.exports = {
  encodeStr,
  hexTable,
  isHexTable,
};