# All files sync-inflate.js

75.31% Statements 61/81
62% Branches 31/50
87.5% Functions 7/8
75.31% Lines 61/81

Press n or j to go to the next uncovered block, b, p or k for the previous block.

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    40
    41
    42
    43
    44
    45
    46
    47
    48
    49
    50
    51
    52
    53
    54
    55
    56
    57
    58
    59
    60
    61
    62
    63
    64
    65
    66
    67
    68
    69
    70
    71
    72
    73
    74
    75
    76
    77
    78
    79
    80
    81
    82
    83
    84
    85
    86
    87
    88
    89
    90
    91
    92
    93
    94
    95
    96
    97
    98
    99
    100
    101
    102
    103
    104
    105
    106
    107
    108
    109
    110
    111
    112
    113
    114
    115
    116
    117
    118
    119
    120
    121
    122
    123
    124
    125
    126
    127
    128
    129
    130
    131
    132
    133
    134
    135
    136
    137
    138
    139
    140
    141
    142
    143
    144
    145
    146
    147
    148
    149
    150
    151
    152
    153
    154
    155
    156
    157
    158
    159
    160
    161
    162
    163
    164
    165
    166
    167
    168
    169

    1x
    1x
    1x

    1x

    127x

    127x
    9x

    127x

    127x
    127x

    127x
    127x

    126x

    126x

    126x
    126x

    1x
    127x

    127x

    127x
    127x
    127x
    127x

    127x
    127x

    127x
    1x

    126x

    126x
    126x

    126x
    126x
    126x

    126x
    9x

    126x
    126x
    126x

    126x
    126x

    127x

    127x
    127x

    127x

    127x
    1x

    126x

    126x
    126x

    126x

    1x

    127x

    127x

    127x
    127x

    127x

    127x

    1x
    1x
    1x
    1x
     "use strict";

    let assert = require("assert").ok;
    let zlib = require("zlib");
    let util = require("util");

    let kMaxLength = require("buffer").kMaxLength;

    function Inflate(opts) {
      Iif (!(this instanceof Inflate)) {
        return new Inflate(opts);
      }

      if (opts && opts.chunkSize < zlib.Z_MIN_CHUNK) {
        opts.chunkSize = zlib.Z_MIN_CHUNK;
      }

      zlib.Inflate.call(this, opts);

      // Node 8 --> 9 compatibility check
      this._offset = this._offset === undefined ? this._outOffset : this._offset;
      this._buffer = this._buffer || this._outBuffer;

      Eif (opts && opts.maxLength != null) {
        this._maxLength = opts.maxLength;
      }
    }

    function createInflate(opts) {
      return new Inflate(opts);
    }

    function _close(engine, callback) {
      Iif (callback) {
        process.nextTick(callback);
      }

      // Caller may invoke .close after a zlib error (which will null _handle).
      Iif (!engine._handle) {
        return;
      }

      engine._handle.close();
      engine._handle = null;
    }

    Inflate.prototype._processChunk = function (chunk, flushFlag, asyncCb) {
      Iif (typeof asyncCb === "function") {
        return zlib.Inflate._processChunk.call(this, chunk, flushFlag, asyncCb);
      }

      let self = this;

      let availInBefore = chunk && chunk.length;
      let availOutBefore = this._chunkSize - this._offset;
      let leftToInflate = this._maxLength;
      let inOff = 0;

      let buffers = [];
      let nread = 0;

      let error;
      this.on("error", function (err) {
        error = err;
      });

      function handleChunk(availInAfter, availOutAfter) {
        Iif (self._hadError) {
          return;
        }

        let have = availOutBefore - availOutAfter;
        assert(have >= 0, "have should not go down");

        Eif (have > 0) {
          let out = self._buffer.slice(self._offset, self._offset + have);
          self._offset += have;

          if (out.length > leftToInflate) {
            out = out.slice(0, leftToInflate);
          }

          buffers.push(out);
          nread += out.length;
          leftToInflate -= out.length;

          Eif (leftToInflate === 0) {
            return false;
          }
        }

        if (availOutAfter === 0 || self._offset >= self._chunkSize) {
          availOutBefore = self._chunkSize;
          self._offset = 0;
          self._buffer = Buffer.allocUnsafe(self._chunkSize);
        }

        if (availOutAfter === 0) {
          inOff += availInBefore - availInAfter;
          availInBefore = availInAfter;

          return true;
        }

        return false;
      }

      assert(this._handle, "zlib binding closed");
      let res;
      do {
        res = this._handle.writeSync(
          flushFlag,
          chunk, // in
          inOff, // in_off
          availInBefore, // in_len
          this._buffer, // out
          this._offset, //out_off
          availOutBefore
        ); // out_len
        // Node 8 --> 9 compatibility check
        res = res || this._writeState;
      } while (!this._hadError && handleChunk(res[0], res[1]));

      if (this._hadError) {
        throw error;
      }

      Iif (nread >= kMaxLength) {
        _close(this);
        throw new RangeError(
          "Cannot create final Buffer. It would be larger than 0x" +
            kMaxLength.toString(16) +
            " bytes"
        );
      }

      let buf = Buffer.concat(buffers, nread);
      _close(this);

      return buf;
    };

    util.inherits(Inflate, zlib.Inflate);

    function zlibBufferSync(engine, buffer) {
      Iif (typeof buffer === "string") {
        buffer = Buffer.from(buffer);
      }
      Iif (!(buffer instanceof Buffer)) {
        throw new TypeError("Not a string or buffer");
      }

      let flushFlag = engine._finishFlushFlag;
      Iif (flushFlag == null) {
        flushFlag = zlib.Z_FINISH;
      }

      return engine._processChunk(buffer, flushFlag);
    }

    function inflateSync(buffer, opts) {
      return zlibBufferSync(new Inflate(opts), buffer);
    }

    module.exports = exports = inflateSync;
    exports.Inflate = Inflate;
    exports.createInflate = createInflate;
    exports.inflateSync = inflateSync;