Edit D:\xinhaisoft\crisis_new\api\node_modules\tedious\lib\tracking-buffer\writable-tracking-buffer.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _jsbi = _interopRequireDefault(require("jsbi"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const SHIFT_LEFT_32 = (1 << 16) * (1 << 16);
const SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32;
const UNKNOWN_PLP_LEN = Buffer.from([0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff]);
const ZERO_LENGTH_BUFFER = Buffer.alloc(0);

/**
  A Buffer-like class that tracks position.

As values are written, the position advances by the size of the written data.
  When writing, automatically allocates new buffers if there's not enough space.
 */
class WritableTrackingBuffer {
  constructor(initialSize, encoding, doubleSizeGrowth) {
    this.initialSize = void 0;
    this.encoding = void 0;
    this.doubleSizeGrowth = void 0;
    this.buffer = void 0;
    this.compositeBuffer = void 0;
    this.position = void 0;
    this.initialSize = initialSize;
    this.encoding = encoding || 'ucs2';
    this.doubleSizeGrowth = doubleSizeGrowth || false;
    this.buffer = Buffer.alloc(this.initialSize, 0);
    this.compositeBuffer = ZERO_LENGTH_BUFFER;
    this.position = 0;
  }

get data() {
    this.newBuffer(0);
    return this.compositeBuffer;
  }

copyFrom(buffer) {
    const length = buffer.length;
    this.makeRoomFor(length);
    buffer.copy(this.buffer, this.position);
    this.position += length;
  }

makeRoomFor(requiredLength) {
    if (this.buffer.length - this.position < requiredLength) {
      if (this.doubleSizeGrowth) {
        let size = Math.max(128, this.buffer.length * 2);

while (size < requiredLength) {
          size *= 2;
        }

this.newBuffer(size);
      } else {
        this.newBuffer(requiredLength);
      }
    }
  }

newBuffer(size) {
    const buffer = this.buffer.slice(0, this.position);
    this.compositeBuffer = Buffer.concat([this.compositeBuffer, buffer]);
    this.buffer = size === 0 ? ZERO_LENGTH_BUFFER : Buffer.alloc(size, 0);
    this.position = 0;
  }

writeUInt8(value) {
    const length = 1;
    this.makeRoomFor(length);
    this.buffer.writeUInt8(value, this.position);
    this.position += length;
  }

writeUInt16LE(value) {
    const length = 2;
    this.makeRoomFor(length);
    this.buffer.writeUInt16LE(value, this.position);
    this.position += length;
  }

writeUShort(value) {
    this.writeUInt16LE(value);
  }

writeUInt16BE(value) {
    const length = 2;
    this.makeRoomFor(length);
    this.buffer.writeUInt16BE(value, this.position);
    this.position += length;
  }

writeUInt24LE(value) {
    const length = 3;
    this.makeRoomFor(length);
    this.buffer[this.position + 2] = value >>> 16 & 0xff;
    this.buffer[this.position + 1] = value >>> 8 & 0xff;
    this.buffer[this.position] = value & 0xff;
    this.position += length;
  }

writeUInt32LE(value) {
    const length = 4;
    this.makeRoomFor(length);
    this.buffer.writeUInt32LE(value, this.position);
    this.position += length;
  }

writeBigInt64LE(value) {
    this.writeBigU_Int64LE(value);
  }

writeBigU_Int64LE(value) {
    this.makeRoomFor(8);

let lo = _jsbi.default.toNumber(_jsbi.default.bitwiseAnd(value, _jsbi.default.BigInt(0xffffffff)));

this.buffer[this.position++] = lo;
    lo = lo >> 8;
    this.buffer[this.position++] = lo;
    lo = lo >> 8;
    this.buffer[this.position++] = lo;
    lo = lo >> 8;
    this.buffer[this.position++] = lo;

let hi = _jsbi.default.toNumber(_jsbi.default.bitwiseAnd(_jsbi.default.signedRightShift(value, _jsbi.default.BigInt(32)), _jsbi.default.BigInt(0xffffffff)));

this.buffer[this.position++] = hi;
    hi = hi >> 8;
    this.buffer[this.position++] = hi;
    hi = hi >> 8;
    this.buffer[this.position++] = hi;
    hi = hi >> 8;
    this.buffer[this.position++] = hi;
  }

writeInt64LE(value) {
    this.writeBigInt64LE(_jsbi.default.BigInt(value));
  }

writeUInt32BE(value) {
    const length = 4;
    this.makeRoomFor(length);
    this.buffer.writeUInt32BE(value, this.position);
    this.position += length;
  }

writeUInt40LE(value) {
    // inspired by https://github.com/dpw/node-buffer-more-ints
    this.writeInt32LE(value & -1);
    this.writeUInt8(Math.floor(value * SHIFT_RIGHT_32));
  }

writeUInt64LE(value) {
    this.writeBigUInt64LE(_jsbi.default.BigInt(value));
  }

writeBigUInt64LE(value) {
    this.writeBigU_Int64LE(value);
  }

writeInt8(value) {
    const length = 1;
    this.makeRoomFor(length);
    this.buffer.writeInt8(value, this.position);
    this.position += length;
  }

writeInt16LE(value) {
    const length = 2;
    this.makeRoomFor(length);
    this.buffer.writeInt16LE(value, this.position);
    this.position += length;
  }

writeInt16BE(value) {
    const length = 2;
    this.makeRoomFor(length);
    this.buffer.writeInt16BE(value, this.position);
    this.position += length;
  }

writeInt32LE(value) {
    const length = 4;
    this.makeRoomFor(length);
    this.buffer.writeInt32LE(value, this.position);
    this.position += length;
  }

writeInt32BE(value) {
    const length = 4;
    this.makeRoomFor(length);
    this.buffer.writeInt32BE(value, this.position);
    this.position += length;
  }

writeFloatLE(value) {
    const length = 4;
    this.makeRoomFor(length);
    this.buffer.writeFloatLE(value, this.position);
    this.position += length;
  }

writeDoubleLE(value) {
    const length = 8;
    this.makeRoomFor(length);
    this.buffer.writeDoubleLE(value, this.position);
    this.position += length;
  }

writeString(value, encoding) {
    if (encoding == null) {
      encoding = this.encoding;
    }

const length = Buffer.byteLength(value, encoding);
    this.makeRoomFor(length); // $FlowFixMe https://github.com/facebook/flow/pull/5398

this.buffer.write(value, this.position, encoding);
    this.position += length;
  }

writeBVarchar(value, encoding) {
    this.writeUInt8(value.length);
    this.writeString(value, encoding);
  }

writeUsVarchar(value, encoding) {
    this.writeUInt16LE(value.length);
    this.writeString(value, encoding);
  } // TODO: Figure out what types are passed in other than `Buffer`

writeUsVarbyte(value, encoding) {
    if (encoding == null) {
      encoding = this.encoding;
    }

let length;

if (value instanceof Buffer) {
      length = value.length;
    } else {
      value = value.toString();
      length = Buffer.byteLength(value, encoding);
    }

this.writeUInt16LE(length);

if (value instanceof Buffer) {
      this.writeBuffer(value);
    } else {
      this.makeRoomFor(length); // $FlowFixMe https://github.com/facebook/flow/pull/5398

this.buffer.write(value, this.position, encoding);
      this.position += length;
    }
  }

writePLPBody(value, encoding) {
    if (encoding == null) {
      encoding = this.encoding;
    }

let length;

if (value instanceof Buffer) {
      length = value.length;
    } else {
      value = value.toString();
      length = Buffer.byteLength(value, encoding);
    } // Length of all chunks.
    // this.writeUInt64LE(length);
    // unknown seems to work better here - might revisit later.

this.writeBuffer(UNKNOWN_PLP_LEN); // In the UNKNOWN_PLP_LEN case, the data is represented as a series of zero or more chunks.

if (length > 0) {
      // One chunk.
      this.writeUInt32LE(length);

if (value instanceof Buffer) {
        this.writeBuffer(value);
      } else {
        this.makeRoomFor(length);
        this.buffer.write(value, this.position, encoding);
        this.position += length;
      }
    } // PLP_TERMINATOR (no more chunks).

this.writeUInt32LE(0);
  }

writeBuffer(value) {
    const length = value.length;
    this.makeRoomFor(length);
    value.copy(this.buffer, this.position);
    this.position += length;
  }

writeMoney(value) {
    this.writeInt32LE(Math.floor(value * SHIFT_RIGHT_32));
    this.writeInt32LE(value & -1);
  }

}

var _default = WritableTrackingBuffer;
exports.default = _default;
module.exports = WritableTrackingBuffer;

Ms-Dos/Windows Unix Write backup

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