# All files sync-reader.js

88.89% Statements 16/18
72.73% Branches 8/11
100% Functions 3/3
88.89% Lines 16/18

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     "use strict";

    let SyncReader = (module.exports = function (buffer) {
      this._buffer = buffer;
      this._reads = [];
    });

    SyncReader.prototype.read = function (length, callback) {
      this._reads.push({
        length: Math.abs(length), // if length < 0 then at most this length
        allowLess: length < 0,
        func: callback,
      });
    };

    SyncReader.prototype.process = function () {
      // as long as there is any data and read requests
      while (this._reads.length > 0 && this._buffer.length) {
        let read = this._reads[0];

        Eif (
          this._buffer.length &&
          (this._buffer.length >= read.length || read.allowLess)
        ) {
          // ok there is any data so that we can satisfy this request
          this._reads.shift(); // == read

          let buf = this._buffer;

          this._buffer = buf.slice(read.length);

          read.func.call(this, buf.slice(0, read.length));
        } else {
          break;
        }
      }

      Iif (this._reads.length > 0) {
        return new Error("There are some read requests waitng on finished stream");
      }

      if (this._buffer.length > 0) {
        return new Error("unrecognised content at end of stream");
      }
    };