'use strict';

var require$$0 = require('buffer');
var require$$0$1 = require('util');

var buffer_list;
var hasRequiredBuffer_list;

function requireBuffer_list () {
	if (hasRequiredBuffer_list) return buffer_list;
	hasRequiredBuffer_list = 1;

	function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); enumerableOnly && (symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; })), keys.push.apply(keys, symbols); } return keys; }
	function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = null != arguments[i] ? arguments[i] : {}; i % 2 ? ownKeys(Object(source), !0).forEach(function (key) { _defineProperty(target, key, source[key]); }) : Object.getOwnPropertyDescriptors ? Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)) : ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } return target; }
	function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
	function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
	function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
	function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
	function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
	function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
	var _require = require$$0,
	  Buffer = _require.Buffer;
	var _require2 = require$$0$1,
	  inspect = _require2.inspect;
	var custom = inspect && inspect.custom || 'inspect';
	function copyBuffer(src, target, offset) {
	  Buffer.prototype.copy.call(src, target, offset);
	}
	buffer_list = /*#__PURE__*/function () {
	  function BufferList() {
	    _classCallCheck(this, BufferList);
	    this.head = null;
	    this.tail = null;
	    this.length = 0;
	  }
	  _createClass(BufferList, [{
	    key: "push",
	    value: function push(v) {
	      var entry = {
	        data: v,
	        next: null
	      };
	      if (this.length > 0) this.tail.next = entry;else this.head = entry;
	      this.tail = entry;
	      ++this.length;
	    }
	  }, {
	    key: "unshift",
	    value: function unshift(v) {
	      var entry = {
	        data: v,
	        next: this.head
	      };
	      if (this.length === 0) this.tail = entry;
	      this.head = entry;
	      ++this.length;
	    }
	  }, {
	    key: "shift",
	    value: function shift() {
	      if (this.length === 0) return;
	      var ret = this.head.data;
	      if (this.length === 1) this.head = this.tail = null;else this.head = this.head.next;
	      --this.length;
	      return ret;
	    }
	  }, {
	    key: "clear",
	    value: function clear() {
	      this.head = this.tail = null;
	      this.length = 0;
	    }
	  }, {
	    key: "join",
	    value: function join(s) {
	      if (this.length === 0) return '';
	      var p = this.head;
	      var ret = '' + p.data;
	      while (p = p.next) ret += s + p.data;
	      return ret;
	    }
	  }, {
	    key: "concat",
	    value: function concat(n) {
	      if (this.length === 0) return Buffer.alloc(0);
	      var ret = Buffer.allocUnsafe(n >>> 0);
	      var p = this.head;
	      var i = 0;
	      while (p) {
	        copyBuffer(p.data, ret, i);
	        i += p.data.length;
	        p = p.next;
	      }
	      return ret;
	    }

	    // Consumes a specified amount of bytes or characters from the buffered data.
	  }, {
	    key: "consume",
	    value: function consume(n, hasStrings) {
	      var ret;
	      if (n < this.head.data.length) {
	        // `slice` is the same for buffers and strings.
	        ret = this.head.data.slice(0, n);
	        this.head.data = this.head.data.slice(n);
	      } else if (n === this.head.data.length) {
	        // First chunk is a perfect match.
	        ret = this.shift();
	      } else {
	        // Result spans more than one buffer.
	        ret = hasStrings ? this._getString(n) : this._getBuffer(n);
	      }
	      return ret;
	    }
	  }, {
	    key: "first",
	    value: function first() {
	      return this.head.data;
	    }

	    // Consumes a specified amount of characters from the buffered data.
	  }, {
	    key: "_getString",
	    value: function _getString(n) {
	      var p = this.head;
	      var c = 1;
	      var ret = p.data;
	      n -= ret.length;
	      while (p = p.next) {
	        var str = p.data;
	        var nb = n > str.length ? str.length : n;
	        if (nb === str.length) ret += str;else ret += str.slice(0, n);
	        n -= nb;
	        if (n === 0) {
	          if (nb === str.length) {
	            ++c;
	            if (p.next) this.head = p.next;else this.head = this.tail = null;
	          } else {
	            this.head = p;
	            p.data = str.slice(nb);
	          }
	          break;
	        }
	        ++c;
	      }
	      this.length -= c;
	      return ret;
	    }

	    // Consumes a specified amount of bytes from the buffered data.
	  }, {
	    key: "_getBuffer",
	    value: function _getBuffer(n) {
	      var ret = Buffer.allocUnsafe(n);
	      var p = this.head;
	      var c = 1;
	      p.data.copy(ret);
	      n -= p.data.length;
	      while (p = p.next) {
	        var buf = p.data;
	        var nb = n > buf.length ? buf.length : n;
	        buf.copy(ret, ret.length - n, 0, nb);
	        n -= nb;
	        if (n === 0) {
	          if (nb === buf.length) {
	            ++c;
	            if (p.next) this.head = p.next;else this.head = this.tail = null;
	          } else {
	            this.head = p;
	            p.data = buf.slice(nb);
	          }
	          break;
	        }
	        ++c;
	      }
	      this.length -= c;
	      return ret;
	    }

	    // Make sure the linked list only shows the minimal necessary information.
	  }, {
	    key: custom,
	    value: function value(_, options) {
	      return inspect(this, _objectSpread(_objectSpread({}, options), {}, {
	        // Only inspect one level.
	        depth: 0,
	        // It should not recurse.
	        customInspect: false
	      }));
	    }
	  }]);
	  return BufferList;
	}();
	return buffer_list;
}

exports.__require = requireBuffer_list;
