cloudfunctions/ClearingRedundantFolders/node_modules/bson/src/float_parser.ts

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// Copyright (c) 2008, Fair Oaks Labs, Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//  * Redistributions of source code must retain the above copyright notice,
//    this list of conditions and the following disclaimer.
//
//  * Redistributions in binary form must reproduce the above copyright notice,
//    this list of conditions and the following disclaimer in the documentation
//    and/or other materials provided with the distribution.
//
//  * Neither the name of Fair Oaks Labs, Inc. nor the names of its contributors
//    may be used to endorse or promote products derived from this software
//    without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//
//
// Modifications to writeIEEE754 to support negative zeroes made by Brian White

type NumericalSequence = { [index: number]: number };

export function readIEEE754(
  buffer: NumericalSequence,
  offset: number,
  endian: 'big' | 'little',
  mLen: number,
  nBytes: number
): number {
  let e: number;
  let m: number;
  const bBE = endian === 'big';
  const eLen = nBytes * 8 - mLen - 1;
  const eMax = (1 << eLen) - 1;
  const eBias = eMax >> 1;
  let nBits = -7;
  let i = bBE ? 0 : nBytes - 1;
  const d = bBE ? 1 : -1;
  let s = buffer[offset + i];

  i += d;

  e = s & ((1 << -nBits) - 1);
  s >>= -nBits;
  nBits += eLen;
  for (; nBits > 0; e = e * 256 + buffer[offset + i], i += d, nBits -= 8);

  m = e & ((1 << -nBits) - 1);