combined-buf.js•3.58 kB
"use strict";
/**
* Copyright (c) "Neo4j"
* Neo4j Sweden AB [https://neo4j.com]
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var __extends = (this && this.__extends) || (function () {
var extendStatics = function (d, b) {
extendStatics = Object.setPrototypeOf ||
({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
return extendStatics(d, b);
};
return function (d, b) {
if (typeof b !== "function" && b !== null)
throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
extendStatics(d, b);
function __() { this.constructor = d; }
d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
};
})();
Object.defineProperty(exports, "__esModule", { value: true });
var buf_1 = require("../buf");
var channel_buf_1 = require("./channel-buf");
/**
* Buffer that combines multiple buffers, exposing them as one single buffer.
*/
var CombinedBuffer = /** @class */ (function (_super) {
__extends(CombinedBuffer, _super);
function CombinedBuffer(buffers) {
var _this = this;
var length = 0;
for (var i = 0; i < buffers.length; i++) {
length += buffers[i].length;
}
_this = _super.call(this, length) || this;
_this._buffers = buffers;
return _this;
}
CombinedBuffer.prototype.getUInt8 = function (position) {
// Surely there's a faster way to do this.. some sort of lookup table thing?
for (var i = 0; i < this._buffers.length; i++) {
var buffer = this._buffers[i];
// If the position is not in the current buffer, skip the current buffer
if (position >= buffer.length) {
position -= buffer.length;
}
else {
return buffer.getUInt8(position);
}
}
};
CombinedBuffer.prototype.getInt8 = function (position) {
// Surely there's a faster way to do this.. some sort of lookup table thing?
for (var i = 0; i < this._buffers.length; i++) {
var buffer = this._buffers[i];
// If the position is not in the current buffer, skip the current buffer
if (position >= buffer.length) {
position -= buffer.length;
}
else {
return buffer.getInt8(position);
}
}
};
CombinedBuffer.prototype.getFloat64 = function (position) {
// At some point, a more efficient impl. For now, we copy the 8 bytes
// we want to read and depend on the platform impl of IEEE 754.
var b = (0, channel_buf_1.alloc)(8);
for (var i = 0; i < 8; i++) {
b.putUInt8(i, this.getUInt8(position + i));
}
return b.getFloat64(0);
};
return CombinedBuffer;
}(buf_1.BaseBuffer));
exports.default = CombinedBuffer;