Code coverage report for sync-inflate.js

# All files sync-inflate.js

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

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     "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;