diff --git a/project/Aki.Common/Aki.Common.csproj b/project/Aki.Common/Aki.Common.csproj index 8826398..137a581 100644 --- a/project/Aki.Common/Aki.Common.csproj +++ b/project/Aki.Common/Aki.Common.csproj @@ -12,6 +12,7 @@ + diff --git a/project/Aki.Common/Http/Client.cs b/project/Aki.Common/Http/Client.cs new file mode 100644 index 0000000..993f1c1 --- /dev/null +++ b/project/Aki.Common/Http/Client.cs @@ -0,0 +1,161 @@ +using System; +using System.IO; +using System.Net.Http; +using Aki.Common.Http; +using Aki.Common.Utils; + +namespace Aki.Common.Http +{ + // NOTE: you do not want to dispose this, keep a reference for the lifetime + // of the application. + // NOTE: cannot be made async due to Unity's limitations. + public class Client : IDisposable + { + protected readonly HttpClient _httpv; + protected readonly string _address; + protected readonly string _accountId; + protected readonly int _retries; + + public Client(string address, string accountId, int retries = 3) + { + _address = address; + _accountId = accountId; + _retries = retries; + + var handler = new HttpClientHandler() + { + // force setting cookies in header instead of CookieContainer + UseCookies = false + }; + + _httpv = new HttpClient(handler); + } + + private HttpRequestMessage GetNewRequest(HttpMethod method, string path) + { + return new HttpRequestMessage() + { + Method = method, + RequestUri = new Uri(_address + path), + Headers = { + { "Cookie", $"PHPSESSID={_accountId}" } + } + }; + } + + protected byte[] Send(HttpMethod method, string path, byte[] data, bool compress = true) + { + HttpResponseMessage response = null; + + using (var request = GetNewRequest(method, path)) + { + if (data != null) + { + // if there is data, convert to payload + byte[] payload = (compress) + ? Zlib.Compress(data, ZlibCompression.Maximum) + : data; + + // add payload to request + request.Content = new ByteArrayContent(payload); + } + + // send request + response = _httpv.SendAsync(request).Result; + } + + if (!response.IsSuccessStatusCode) + { + // response error + throw new Exception($"Code {response.StatusCode}"); + } + + using (var ms = new MemoryStream()) + { + using (var stream = response.Content.ReadAsStreamAsync().Result) + { + // grap response payload + stream.CopyTo(ms); + var bytes = ms.ToArray(); + + if (bytes != null) + { + // payload contains data + return Zlib.IsCompressed(bytes) + ? Zlib.Decompress(bytes) + : bytes; + } + } + } + + // response returned no data + return null; + } + + public byte[] Get(string path) + { + var error = new Exception("Internal error"); + + // NOTE: <= is intentional, 0 is send, 1,2,3 is retry + for (var i = 0; i <= _retries; ++i) + { + try + { + return Send(HttpMethod.Get, path, null, false); + } + catch (Exception ex) + { + error = ex; + } + } + + throw error; + } + + public byte[] Post(string path, byte[] data, bool compressed = true) + { + var error = new Exception("Internal error"); + + // NOTE: <= is intentional, 0 is send, 1,2,3 is retry + for (var i = 0; i <= _retries; ++i) + { + try + { + return Send(HttpMethod.Post, path, data, compressed); + } + catch (Exception ex) + { + error = ex; + } + } + + throw error; + } + + public void Put(string path, byte[] data, bool compressed = true) + { + var error = new Exception("Internal error"); + + // NOTE: <= is intentional, 0 is send, 1,2,3 is retry + for (var i = 0; i <= _retries; ++i) + { + try + { + Send(HttpMethod.Put, path, data, compressed); + return; + } + catch (Exception ex) + { + error = ex; + } + } + + throw error; + } + + public void Dispose() + { + _httpv.Dispose(); + } + } +} diff --git a/project/Aki.Common/Http/Request.cs b/project/Aki.Common/Http/Request.cs index 0b9414b..0b92c5a 100644 --- a/project/Aki.Common/Http/Request.cs +++ b/project/Aki.Common/Http/Request.cs @@ -1,3 +1,5 @@ +#region DEPRECATED, REMOVE IN 3.8.1 + using System; using System.Collections.Generic; using System.IO; @@ -6,12 +8,10 @@ using Aki.Common.Utils; namespace Aki.Common.Http { + [Obsolete("Request is deprecated, please use Aki.Common.Http.Client instead.")] public class Request { - /// - /// Send a request to remote endpoint and optionally receive a response body. - /// Deflate is the accepted compression format. - /// + [Obsolete("Request.Send() is deprecated, please use Aki.Common.Http.Client instead.")] public byte[] Send(string url, string method, byte[] data = null, bool compress = true, string mime = null, Dictionary headers = null) { if (!WebConstants.IsValidMethod(method)) @@ -81,3 +81,5 @@ namespace Aki.Common.Http } } } + +#endregion \ No newline at end of file diff --git a/project/Aki.Common/Http/RequestHandler.cs b/project/Aki.Common/Http/RequestHandler.cs index c62bc83..22f5d65 100644 --- a/project/Aki.Common/Http/RequestHandler.cs +++ b/project/Aki.Common/Http/RequestHandler.cs @@ -1,50 +1,46 @@ using System; using System.Collections.Generic; using System.Text; -using Aki.Common.Utils; +using System.Threading.Tasks; using BepInEx.Logging; +using Aki.Common.Utils; namespace Aki.Common.Http { public static class RequestHandler { - private static string _host; - private static Request _request; - private static Dictionary _headers; private static ManualLogSource _logger; - - public static string SessionId { get; private set; } + public static readonly Client HttpClient; + public static readonly string Host; + public static readonly string SessionId; + public static readonly bool IsLocal; static RequestHandler() { _logger = Logger.CreateLogSource(nameof(RequestHandler)); - Initialize(); - } + + // grab required info from command args + var args = Environment.GetCommandLineArgs(); - private static void Initialize() - { - _request = new Request(); - - string[] args = Environment.GetCommandLineArgs(); - - foreach (string arg in args) + foreach (var arg in args) { if (arg.Contains("BackendUrl")) { - string json = arg.Replace("-config=", string.Empty); - _host = Json.Deserialize(json).BackendUrl; + var json = arg.Replace("-config=", string.Empty); + Host = Json.Deserialize(json).BackendUrl; } if (arg.Contains("-token=")) { SessionId = arg.Replace("-token=", string.Empty); - _headers = new Dictionary() - { - { "Cookie", $"PHPSESSID={SessionId}" }, - { "SessionId", SessionId } - }; } } + + IsLocal = Host.Contains("127.0.0.1") + || Host.Contains("localhost"); + + // initialize http client + HttpClient = new Client(Host, SessionId); } private static void ValidateData(byte[] data) @@ -67,46 +63,129 @@ namespace Aki.Common.Http _logger.LogInfo($"Request was successful"); } - public static byte[] GetData(string path, bool hasHost = false) + public static byte[] GetData(string path) { - string url = (hasHost) ? path : _host + path; + _logger.LogInfo($"Request GET data: {SessionId}:{path}"); + + var data = HttpClient.Get(path); + ValidateData(data); + return data; + } + + public static string GetJson(string path) + { + _logger.LogInfo($"Request GET json: {SessionId}:{path}"); + + var payload = HttpClient.Get(path); + var body = Encoding.UTF8.GetString(payload); + + ValidateJson(body); + return body; + } + + public static string PostJson(string path, string json) + { + _logger.LogInfo($"Request POST json: {SessionId}:{path}"); + + var payload = Encoding.UTF8.GetBytes(json); + var data = HttpClient.Post(path, payload); + var body = Encoding.UTF8.GetString(data); + + ValidateJson(body); + return body; + } + + public static void PutJson(string path, string json) + { + _logger.LogInfo($"Request PUT json: {SessionId}:{path}"); + + var payload = Encoding.UTF8.GetBytes(json); + HttpClient.Put(path, payload); + } + +#region DEPRECATED, REMOVE IN 3.8.1 + [Obsolete("GetData(path, isHost) is deprecated, please use GetData(path) instead.")] + public static byte[] GetData(string path, bool hasHost) + { + var url = (hasHost) ? path : Host + path; _logger.LogInfo($"Request GET data: {SessionId}:{url}"); - byte[] result = _request.Send(url, "GET", null, headers: _headers); - ValidateData(result); - return result; + var headers = new Dictionary() + { + { "Cookie", $"PHPSESSID={SessionId}" }, + { "SessionId", SessionId } + }; + + var request = new Request(); + var data = request.Send(url, "GET", null, headers: headers); + + ValidateData(data); + return data; + } - public static string GetJson(string path, bool hasHost = false) + [Obsolete("GetJson(path, isHost) is deprecated, please use GetJson(path) instead.")] + public static string GetJson(string path, bool hasHost) { - string url = (hasHost) ? path : _host + path; - + var url = (hasHost) ? path : Host + path; _logger.LogInfo($"Request GET json: {SessionId}:{url}"); - byte[] data = _request.Send(url, "GET", headers: _headers); - string result = Encoding.UTF8.GetString(data); - ValidateJson(result); - return result; + var headers = new Dictionary() + { + { "Cookie", $"PHPSESSID={SessionId}" }, + { "SessionId", SessionId } + }; + + var request = new Request(); + var data = request.Send(url, "GET", headers: headers); + var body = Encoding.UTF8.GetString(data); + + ValidateJson(body); + return body; + } - public static string PostJson(string path, string json, bool hasHost = false) + [Obsolete("PostJson(path, json, isHost) is deprecated, please use PostJson(path, json) instead.")] + public static string PostJson(string path, string json, bool hasHost) { - string url = (hasHost) ? path : _host + path; - + var url = (hasHost) ? path : Host + path; _logger.LogInfo($"Request POST json: {SessionId}:{url}"); - byte[] data = _request.Send(url, "POST", Encoding.UTF8.GetBytes(json), true, "application/json", _headers); - string result = Encoding.UTF8.GetString(data); - ValidateJson(result); - return result; + var payload = Encoding.UTF8.GetBytes(json); + var mime = WebConstants.Mime[".json"]; + var headers = new Dictionary() + { + { "Cookie", $"PHPSESSID={SessionId}" }, + { "SessionId", SessionId } + }; + + var request = new Request(); + var data = request.Send(url, "POST", payload, true, mime, headers); + var body = Encoding.UTF8.GetString(data); + + ValidateJson(body); + return body; + } - public static void PutJson(string path, string json, bool hasHost = false) + [Obsolete("PutJson(path, json, isHost) is deprecated, please use PutJson(path, json) instead.")] + public static void PutJson(string path, string json, bool hasHost) { - string url = (hasHost) ? path : _host + path; + var url = (hasHost) ? path : Host + path; _logger.LogInfo($"Request PUT json: {SessionId}:{url}"); - _request.Send(url, "PUT", Encoding.UTF8.GetBytes(json), true, "application/json", _headers); + + var payload = Encoding.UTF8.GetBytes(json); + var mime = WebConstants.Mime[".json"]; + var headers = new Dictionary() + { + { "Cookie", $"PHPSESSID={SessionId}" }, + { "SessionId", SessionId } + }; + + var request = new Request(); + request.Send(url, "PUT", payload, true, mime, headers); } +#endregion } } diff --git a/project/Aki.Common/Http/WebConstants.cs b/project/Aki.Common/Http/WebConstants.cs index cdd0873..57b797e 100644 --- a/project/Aki.Common/Http/WebConstants.cs +++ b/project/Aki.Common/Http/WebConstants.cs @@ -1,53 +1,39 @@ -using System.Collections.Generic; +#region DEPRECATED, REMOVE IN 3.8.1 + +using System; +using System.Collections.Generic; using System.Linq; namespace Aki.Common.Http { + [Obsolete("WebConstants is deprecated, please use System.Net.Http functionality instead.")] public static class WebConstants { - /// - /// HTML GET method. - /// + [Obsolete("Get is deprecated, please use HttpMethod.Get instead.")] public const string Get = "GET"; - /// - /// HTML HEAD method. - /// + [Obsolete("Head is deprecated, please use HttpMethod.Head instead.")] public const string Head = "HEAD"; - /// - /// HTML POST method. - /// + [Obsolete("Post is deprecated, please use HttpMethod.Post instead.")] public const string Post = "POST"; - /// - /// HTML PUT method. - /// + [Obsolete("Put is deprecated, please use HttpMethod.Put instead.")] public const string Put = "PUT"; - /// - /// HTML DELETE method. - /// + [Obsolete("Delete is deprecated, please use HttpMethod.Delete instead.")] public const string Delete = "DELETE"; - /// - /// HTML CONNECT method. - /// + [Obsolete("Connect is deprecated, please use HttpMethod.Connect instead.")] public const string Connect = "CONNECT"; - /// - /// HTML OPTIONS method. - /// + [Obsolete("Options is deprecated, please use HttpMethod.Options instead.")] public const string Options = "OPTIONS"; - /// - /// HTML TRACE method. - /// + [Obsolete("Trace is deprecated, please use HttpMethod.Trace instead.")] public const string Trace = "TRACE"; - /// - /// HTML MIME types. - /// + [Obsolete("Mime is deprecated, there is sadly no replacement.")] public static Dictionary Mime { get; private set; } static WebConstants() @@ -68,9 +54,7 @@ namespace Aki.Common.Http }; } - /// - /// Is HTML method valid? - /// + [Obsolete("IsValidMethod is deprecated, please check against HttpMethod entries instead.")] public static bool IsValidMethod(string method) { return method == Get @@ -83,12 +67,12 @@ namespace Aki.Common.Http || method == Trace; } - /// - /// Is MIME type valid? - /// + [Obsolete("isValidMime is deprecated, there is sadly no replacement available.")] public static bool IsValidMime(string mime) { return Mime.Any(x => x.Value == mime); } } } + +#endregion \ No newline at end of file diff --git a/project/Aki.Custom/Models/BundleInfo.cs b/project/Aki.Custom/Models/BundleInfo.cs index b3026e5..b393746 100644 --- a/project/Aki.Custom/Models/BundleInfo.cs +++ b/project/Aki.Custom/Models/BundleInfo.cs @@ -1,5 +1,10 @@ -namespace Aki.Custom.Models +#region DEPRECATED, REMOVE IN 3.8.1 + +using System; + +namespace Aki.Custom.Models { + [Obsolete("BundleInfo is deprecated, please use BundleItem instead.")] public class BundleInfo { public string Key { get; } @@ -14,3 +19,5 @@ } } } + +#endregion \ No newline at end of file diff --git a/project/Aki.Custom/Models/BundleItem.cs b/project/Aki.Custom/Models/BundleItem.cs index 0b5b963..62ccd26 100644 --- a/project/Aki.Custom/Models/BundleItem.cs +++ b/project/Aki.Custom/Models/BundleItem.cs @@ -1,9 +1,29 @@ -namespace Aki.Custom.Models +using System.Runtime.Serialization; + +namespace Aki.Custom.Models { + [DataContract] public struct BundleItem { + [DataMember(Name = "filename")] public string FileName; + + [DataMember(Name = "crc")] public uint Crc; + + [DataMember(Name = "dependencies")] public string[] Dependencies; + + // exclusive to aki, ignored in EscapeFromTarkov_Data/StreamingAssets/Windows/Windows.json + [DataMember(Name = "modpath")] + public string ModPath; + + public BundleItem(string filename, uint crc, string[] dependencies, string modpath = "") + { + FileName = filename; + Crc = crc; + Dependencies = dependencies; + ModPath = modpath; + } } } diff --git a/project/Aki.Custom/Patches/EasyAssetsPatch.cs b/project/Aki.Custom/Patches/EasyAssetsPatch.cs index a9a3c3f..7f4fa16 100644 --- a/project/Aki.Custom/Patches/EasyAssetsPatch.cs +++ b/project/Aki.Custom/Patches/EasyAssetsPatch.cs @@ -72,7 +72,6 @@ namespace Aki.Custom.Patches var bundleNames = manifest.GetAllAssetBundles() .Union(BundleManager.Bundles.Keys) .ToArray(); - var bundles = (IEasyBundle[])Array.CreateInstance(EasyBundleHelper.Type, bundleNames.Length); // create bundle lock if (bundleLock == null) @@ -81,6 +80,8 @@ namespace Aki.Custom.Patches } // create bundle of obfuscated type + var bundles = (IEasyBundle[])Array.CreateInstance(EasyBundleHelper.Type, bundleNames.Length); + for (var i = 0; i < bundleNames.Length; i++) { bundles[i] = (IEasyBundle)Activator.CreateInstance(EasyBundleHelper.Type, new object[] diff --git a/project/Aki.Custom/Patches/EasyBundlePatch.cs b/project/Aki.Custom/Patches/EasyBundlePatch.cs index 5bf7c3f..f5e727c 100644 --- a/project/Aki.Custom/Patches/EasyBundlePatch.cs +++ b/project/Aki.Custom/Patches/EasyBundlePatch.cs @@ -27,26 +27,26 @@ namespace Aki.Custom.Patches [PatchPostfix] private static void PatchPostfix(object __instance, string key, string rootPath, CompatibilityAssetBundleManifest manifest, IBundleLock bundleLock) { - var path = rootPath + key; - var dependencyKeys = manifest.GetDirectDependencies(key) ?? Array.Empty(); + var filepath = rootPath + key; + var dependencies = manifest.GetDirectDependencies(key) ?? Array.Empty(); - if (BundleManager.Bundles.TryGetValue(key, out BundleInfo bundle)) + if (BundleManager.Bundles.TryGetValue(key, out BundleItem bundle)) { // server bundle - dependencyKeys = (dependencyKeys.Length > 0) - ? dependencyKeys.Union(bundle.DependencyKeys).ToArray() - : bundle.DependencyKeys; + dependencies = (dependencies.Length > 0) + ? dependencies.Union(bundle.Dependencies).ToArray() + : bundle.Dependencies; - // set path to either cachedpath (HTTP) or modpath (local) - path = bundle.Path; + // set path to either cache (HTTP) or mod (local) + filepath = BundleManager.GetBundlePath(bundle); } _ = new EasyBundleHelper(__instance) { Key = key, - Path = path, + Path = filepath, KeyWithoutExtension = Path.GetFileNameWithoutExtension(key), - DependencyKeys = dependencyKeys, + DependencyKeys = dependencies, LoadState = new BindableState(ELoadState.Unloaded, null), BundleLock = bundleLock }; diff --git a/project/Aki.Custom/Utils/BundleManager.cs b/project/Aki.Custom/Utils/BundleManager.cs index 95e0d83..caf11ac 100644 --- a/project/Aki.Custom/Utils/BundleManager.cs +++ b/project/Aki.Custom/Utils/BundleManager.cs @@ -1,50 +1,109 @@ -using System.Collections.Generic; -using System.Text.RegularExpressions; +using System.Collections.Concurrent; +using System.Threading.Tasks; +using BepInEx.Logging; +using Newtonsoft.Json; using Aki.Common.Http; using Aki.Common.Utils; using Aki.Custom.Models; -using Newtonsoft.Json.Linq; namespace Aki.Custom.Utils { public static class BundleManager { - public const string CachePath = "user/cache/bundles/"; - public static Dictionary Bundles { get; private set; } + private static ManualLogSource _logger; + public static readonly ConcurrentDictionary Bundles; + public static string CachePath; static BundleManager() { - Bundles = new Dictionary(); + _logger = Logger.CreateLogSource(nameof(BundleManager)); + Bundles = new ConcurrentDictionary(); + CachePath = "user/cache/bundles/"; + } - if (VFS.Exists(CachePath)) - { - VFS.DeleteDirectory(CachePath); - } + public static string GetBundlePath(BundleItem bundle) + { + return RequestHandler.IsLocal + ? $"{bundle.ModPath}/bundles/{bundle.FileName}" + : CachePath + bundle.FileName; } public static void GetBundles() { + // get bundles var json = RequestHandler.GetJson("/singleplayer/bundles"); - var jArray = JArray.Parse(json); + var bundles = JsonConvert.DeserializeObject(json); - foreach (var jObj in jArray) + // register bundles + var toDownload = new ConcurrentBag(); + + Parallel.ForEach(bundles, (bundle) => { - var key = jObj["key"].ToString(); - var path = jObj["path"].ToString(); - var bundle = new BundleInfo(key, path, jObj["dependencyKeys"].ToObject()); + Bundles.TryAdd(bundle.FileName, bundle); - if (path.Contains("http")) + if (ShouldReaquire(bundle)) { - var filepath = CachePath + Regex.Split(path, "bundle/", RegexOptions.IgnoreCase)[1]; - var data = RequestHandler.GetData(path, true); - VFS.WriteFile(filepath, data); - bundle.Path = filepath; + // mark for download + toDownload.Add(bundle); } + }); - Bundles.Add(key, bundle); + if (RequestHandler.IsLocal) + { + // loading from local mods + _logger.LogInfo("CACHE: Loading all bundles from mods on disk."); + return; + } + else + { + // download bundles + // NOTE: assumes bundle keys to be unique + Parallel.ForEach(toDownload, (bundle) => + { + // download bundle + var filepath = GetBundlePath(bundle); + var data = RequestHandler.GetData($"/files/bundle/{bundle.FileName}"); + VFS.WriteFile(filepath, data); + }); + } + } + + private static bool ShouldReaquire(BundleItem bundle) + { + if (RequestHandler.IsLocal) + { + // only handle remote bundles + return false; } - VFS.WriteTextFile(CachePath + "bundles.json", Json.Serialize>(Bundles)); + // read cache + var filepath = CachePath + bundle.FileName; + + if (VFS.Exists(filepath)) + { + // calculate hash + var data = VFS.ReadFile(filepath); + var crc = Crc32.Compute(data); + + if (crc == bundle.Crc) + { + // file is up-to-date + _logger.LogInfo($"CACHE: Loading locally {bundle.FileName}"); + return false; + } + else + { + // crc doesn't match, reaquire the file + _logger.LogInfo($"CACHE: Bundle is invalid, (re-)acquiring {bundle.FileName}"); + return true; + } + } + else + { + // file doesn't exist in cache + _logger.LogInfo($"CACHE: Bundle is missing, (re-)acquiring {bundle.FileName}"); + return true; + } } } } diff --git a/project/Aki.Custom/Utils/Crc32.cs b/project/Aki.Custom/Utils/Crc32.cs new file mode 100644 index 0000000..afbc858 --- /dev/null +++ b/project/Aki.Custom/Utils/Crc32.cs @@ -0,0 +1,80 @@ +/* + By Senko-san (Merijn Hendriks) + Taken from https://github.com/spt-haru/haru +*/ + +using System; + +namespace Aki.Custom.Utils +{ + public class Crc32 + { + private static readonly uint[] _lookupTable = new uint[] + { + 0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, + 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832, 0x79DCB8A4, + 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, + 0x90BF1D91, 0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE, + 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, + 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC, 0x14015C4F, 0x63066CD9, + 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, + 0xA2677172, 0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, + 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3, + 0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, + 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423, 0xCFBA9599, + 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, + 0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D, 0x76DC4190, + 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, + 0x9FBFE4A5, 0xE8B8D433, 0x7807C9A2, 0x0F00F934, 0x9609A88E, + 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, + 0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, + 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950, + 0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, + 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2, + 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, + 0x346ED9FC, 0xAD678846, 0xDA60B8D0, 0x44042D73, 0x33031DE5, + 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, + 0xC90C2086, 0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F, + 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, + 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, + 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615, + 0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, + 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1, 0xF00F9344, + 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, + 0x196C3671, 0x6E6B06E7, 0xFED41B76, 0x89D32BE0, 0x10DA7A5A, + 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, + 0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, + 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, + 0x36034AF6, 0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, + 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236, + 0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, + 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7, 0xB5D0CF31, + 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, + 0x026D930A, 0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713, + 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, + 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, + 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, + 0x18B74777, 0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, + 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278, + 0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, + 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, + 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, + 0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6, 0xBAD03605, + 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, + 0x5D681B02, 0x2A6F2B94, 0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, + 0x2D02EF8D + }; + + public static uint Compute(byte[] bytes) + { + var crc = uint.MaxValue; + + foreach (var octet in bytes) + { + crc = _lookupTable[(crc ^ octet) & byte.MaxValue] ^ crc >> 8; + } + + return ~crc; + } + } +}