diff --git a/LibMatrix/Extensions/CanonicalJsonSerializer.cs b/LibMatrix/Extensions/CanonicalJsonSerializer.cs
new file mode 100644
index 0000000..ae535aa
--- /dev/null
+++ b/LibMatrix/Extensions/CanonicalJsonSerializer.cs
@@ -0,0 +1,96 @@
+using System.Collections.Frozen;
+using System.Reflection;
+using System.Text.Json;
+using System.Text.Json.Nodes;
+using System.Text.Json.Serialization.Metadata;
+using ArcaneLibs.Extensions;
+
+namespace LibMatrix.Extensions;
+
+public static class CanonicalJsonSerializer {
+ // TODO: Alphabetise dictionaries
+ private static JsonSerializerOptions JsonOptions => new() {
+ WriteIndented = false,
+ Encoder = UnicodeJsonEncoder.Singleton,
+ };
+
+ private static readonly FrozenSet<PropertyInfo> JsonSerializerOptionsProperties = typeof(JsonSerializerOptions)
+ .GetProperties(BindingFlags.Public | BindingFlags.Instance)
+ .Where(x => x.SetMethod != null && x.GetMethod != null)
+ .ToFrozenSet();
+
+ private static JsonSerializerOptions MergeOptions(JsonSerializerOptions? inputOptions) {
+ var newOptions = JsonOptions;
+ if (inputOptions == null)
+ return newOptions;
+
+ foreach (var property in JsonSerializerOptionsProperties) {
+ if(property.Name == nameof(JsonSerializerOptions.Encoder))
+ continue;
+ if (property.Name == nameof(JsonSerializerOptions.WriteIndented))
+ continue;
+
+ var value = property.GetValue(inputOptions);
+ // if (value == null)
+ // continue;
+ property.SetValue(newOptions, value);
+ }
+
+ return newOptions;
+ }
+
+#region STJ API
+
+ public static String Serialize<TValue>(TValue value, JsonSerializerOptions? options = null) {
+ var newOptions = MergeOptions(options);
+
+ return JsonSerializer.SerializeToNode(value, options) // We want to allow passing custom converters for eg. double/float -> string here...
+ .SortProperties()!
+ .CanonicalizeNumbers()!
+ .ToJsonString(newOptions);
+
+
+ // System.Text.Json.JsonSerializer.SerializeToNode(System.Text.Json.JsonSerializer.Deserialize<dynamic>("{\n \"a\": -0,\n \"b\": 1e10\n}")).ToJsonString();
+
+ }
+
+ public static String Serialize(object value, Type inputType, JsonSerializerOptions? options = null) => JsonSerializer.Serialize(value, inputType, JsonOptions);
+ // public static String Serialize<TValue>(TValue value, JsonTypeInfo<TValue> jsonTypeInfo) => JsonSerializer.Serialize(value, jsonTypeInfo, _options);
+ // public static String Serialize(Object value, JsonTypeInfo jsonTypeInfo)
+
+ public static byte[] SerializeToUtf8Bytes<T>(T value, JsonSerializerOptions? options = null) {
+ var newOptions = MergeOptions(null);
+ return JsonSerializer.SerializeToNode(value, options) // We want to allow passing custom converters for eg. double/float -> string here...
+ .SortProperties()!
+ .CanonicalizeNumbers()!
+ .ToJsonString(newOptions).AsBytes().ToArray();
+ }
+
+#endregion
+
+ // ReSharper disable once UnusedType.Local
+ private static class JsonExtensions {
+ public static Action<JsonTypeInfo> AlphabetizeProperties(Type type) {
+ return typeInfo => {
+ if (typeInfo.Kind != JsonTypeInfoKind.Object || !type.IsAssignableFrom(typeInfo.Type))
+ return;
+ AlphabetizeProperties()(typeInfo);
+ };
+ }
+
+ public static Action<JsonTypeInfo> AlphabetizeProperties() {
+ return static typeInfo => {
+ if (typeInfo.Kind == JsonTypeInfoKind.Dictionary) { }
+
+ if (typeInfo.Kind != JsonTypeInfoKind.Object)
+ return;
+ var properties = typeInfo.Properties.OrderBy(p => p.Name, StringComparer.Ordinal).ToList();
+ typeInfo.Properties.Clear();
+ for (int i = 0; i < properties.Count; i++) {
+ properties[i].Order = i;
+ typeInfo.Properties.Add(properties[i]);
+ }
+ };
+ }
+ }
+}
\ No newline at end of file
diff --git a/LibMatrix/Extensions/EnumerableExtensions.cs b/LibMatrix/Extensions/EnumerableExtensions.cs
index 42d9491..4dcf26e 100644
--- a/LibMatrix/Extensions/EnumerableExtensions.cs
+++ b/LibMatrix/Extensions/EnumerableExtensions.cs
@@ -1,29 +1,86 @@
+using System.Collections.Frozen;
+using System.Collections.Immutable;
+
namespace LibMatrix.Extensions;
public static class EnumerableExtensions {
public static void MergeStateEventLists(this IList<StateEvent> oldState, IList<StateEvent> newState) {
- foreach (var stateEvent in newState) {
- var old = oldState.FirstOrDefault(x => x.Type == stateEvent.Type && x.StateKey == stateEvent.StateKey);
- if (old is null) {
- oldState.Add(stateEvent);
- continue;
+ // foreach (var stateEvent in newState) {
+ // var old = oldState.FirstOrDefault(x => x.Type == stateEvent.Type && x.StateKey == stateEvent.StateKey);
+ // if (old is null) {
+ // oldState.Add(stateEvent);
+ // continue;
+ // }
+ //
+ // oldState.Remove(old);
+ // oldState.Add(stateEvent);
+ // }
+
+ foreach (var e in newState) {
+ switch (FindIndex(e)) {
+ case -1:
+ oldState.Add(e);
+ break;
+ case var index:
+ oldState[index] = e;
+ break;
+ }
+ }
+
+ int FindIndex(StateEvent needle) {
+ for (int i = 0; i < oldState.Count; i++) {
+ var old = oldState[i];
+ if (old.Type == needle.Type && old.StateKey == needle.StateKey)
+ return i;
}
- oldState.Remove(old);
- oldState.Add(stateEvent);
+ return -1;
}
}
public static void MergeStateEventLists(this IList<StateEventResponse> oldState, IList<StateEventResponse> newState) {
- foreach (var stateEvent in newState) {
- var old = oldState.FirstOrDefault(x => x.Type == stateEvent.Type && x.StateKey == stateEvent.StateKey);
- if (old is null) {
- oldState.Add(stateEvent);
- continue;
+ foreach (var e in newState) {
+ switch (FindIndex(e)) {
+ case -1:
+ oldState.Add(e);
+ break;
+ case var index:
+ oldState[index] = e;
+ break;
+ }
+ }
+
+ int FindIndex(StateEventResponse needle) {
+ for (int i = 0; i < oldState.Count; i++) {
+ var old = oldState[i];
+ if (old.Type == needle.Type && old.StateKey == needle.StateKey)
+ return i;
+ }
+
+ return -1;
+ }
+ }
+
+ public static void MergeStateEventLists(this List<StateEventResponse> oldState, List<StateEventResponse> newState) {
+ foreach (var e in newState) {
+ switch (FindIndex(e)) {
+ case -1:
+ oldState.Add(e);
+ break;
+ case var index:
+ oldState[index] = e;
+ break;
+ }
+ }
+
+ int FindIndex(StateEventResponse needle) {
+ for (int i = 0; i < oldState.Count; i++) {
+ var old = oldState[i];
+ if (old.Type == needle.Type && old.StateKey == needle.StateKey)
+ return i;
}
- oldState.Remove(old);
- oldState.Add(stateEvent);
+ return -1;
}
}
}
\ No newline at end of file
diff --git a/LibMatrix/Extensions/JsonElementExtensions.cs b/LibMatrix/Extensions/JsonElementExtensions.cs
index c4ed743..dfec95b 100644
--- a/LibMatrix/Extensions/JsonElementExtensions.cs
+++ b/LibMatrix/Extensions/JsonElementExtensions.cs
@@ -126,6 +126,7 @@ public static class JsonElementExtensions {
$"Encountered dictionary {field.Name} with key type {keyType.Name} and value type {valueType.Name}!");
return field.Value.EnumerateObject()
+ // TODO: use key.Value?
.Where(key => !valueType.IsPrimitive && valueType != typeof(string))
.Aggregate(false, (current, key) =>
current | key.FindExtraJsonPropertyFieldsByValueKind(containerType, valueType)
diff --git a/LibMatrix/Extensions/MatrixHttpClient.Multi.cs b/LibMatrix/Extensions/MatrixHttpClient.Multi.cs
index e7a2044..bf6fe63 100644
--- a/LibMatrix/Extensions/MatrixHttpClient.Multi.cs
+++ b/LibMatrix/Extensions/MatrixHttpClient.Multi.cs
@@ -1,16 +1,5 @@
#define SINGLE_HTTPCLIENT // Use a single HttpClient instance for all MatrixHttpClient instances
// #define SYNC_HTTPCLIENT // Only allow one request as a time, for debugging
-using System.Diagnostics;
-using System.Diagnostics.CodeAnalysis;
-using System.Net.Http.Headers;
-using System.Reflection;
-using System.Security.Cryptography.X509Certificates;
-using System.Text;
-using System.Text.Json;
-using System.Text.Json.Serialization;
-using ArcaneLibs;
-using ArcaneLibs.Extensions;
-
namespace LibMatrix.Extensions;
public static class HttpClientExtensions {
diff --git a/LibMatrix/Extensions/MatrixHttpClient.Single.cs b/LibMatrix/Extensions/MatrixHttpClient.Single.cs
index 39eb7e5..671566f 100644
--- a/LibMatrix/Extensions/MatrixHttpClient.Single.cs
+++ b/LibMatrix/Extensions/MatrixHttpClient.Single.cs
@@ -1,20 +1,21 @@
#define SINGLE_HTTPCLIENT // Use a single HttpClient instance for all MatrixHttpClient instances
-// #define SYNC_HTTPCLIENT // Only allow one request as a time, for debugging
+// #define SYNC_HTTPCLIENT // Only allow one request as a time, for debugging
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
+using System.Net;
using System.Net.Http.Headers;
using System.Reflection;
-using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Text.Json;
using System.Text.Json.Serialization;
using ArcaneLibs;
using ArcaneLibs.Extensions;
+using LibMatrix.Homeservers.ImplementationDetails.Synapse.Models.Requests;
namespace LibMatrix.Extensions;
#if SINGLE_HTTPCLIENT
-// TODO: Add URI wrapper for
+// TODO: Add URI wrapper for
public class MatrixHttpClient {
private static readonly HttpClient Client;
@@ -50,6 +51,7 @@ public class MatrixHttpClient {
internal SemaphoreSlim _rateLimitSemaphore { get; } = new(1, 1);
#endif
+ public static bool LogRequests = true;
public Dictionary<string, string> AdditionalQueryParameters { get; set; } = new();
public Uri? BaseAddress { get; set; }
@@ -59,7 +61,7 @@ public class MatrixHttpClient {
typeof(HttpRequestHeaders).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null, [], null)?.Invoke([]) as HttpRequestHeaders ??
throw new InvalidOperationException("Failed to create HttpRequestHeaders");
- private JsonSerializerOptions GetJsonSerializerOptions(JsonSerializerOptions? options = null) {
+ private static JsonSerializerOptions GetJsonSerializerOptions(JsonSerializerOptions? options = null) {
options ??= new JsonSerializerOptions();
options.Converters.Add(new JsonFloatStringConverter());
options.Converters.Add(new JsonDoubleStringConverter());
@@ -68,27 +70,54 @@ public class MatrixHttpClient {
return options;
}
- public async Task<HttpResponseMessage> SendUnhandledAsync(HttpRequestMessage request, CancellationToken cancellationToken) {
+ public async Task<HttpResponseMessage> SendUnhandledAsync(HttpRequestMessage request, CancellationToken cancellationToken, int attempt = 0) {
+ if (request.RequestUri is null) throw new NullReferenceException("RequestUri is null");
+ // if (!request.RequestUri.IsAbsoluteUri)
+ request.RequestUri = request.RequestUri.EnsureAbsolute(BaseAddress!);
+ var swWait = Stopwatch.StartNew();
#if SYNC_HTTPCLIENT
await _rateLimitSemaphore.WaitAsync(cancellationToken);
#endif
- Console.WriteLine($"Sending {request.Method} {BaseAddress}{request.RequestUri} ({Util.BytesToString(request.Content?.Headers.ContentLength ?? 0)})");
-
if (request.RequestUri is null) throw new NullReferenceException("RequestUri is null");
- if (!request.RequestUri.IsAbsoluteUri) request.RequestUri = new Uri(BaseAddress, request.RequestUri);
+ if (!request.RequestUri.IsAbsoluteUri)
+ request.RequestUri = new Uri(BaseAddress ?? throw new InvalidOperationException("Relative URI passed, but no BaseAddress is specified!"), request.RequestUri);
+ swWait.Stop();
+ var swExec = Stopwatch.StartNew();
+
foreach (var (key, value) in AdditionalQueryParameters) request.RequestUri = request.RequestUri.AddQuery(key, value);
- foreach (var (key, value) in DefaultRequestHeaders) request.Headers.Add(key, value);
+ foreach (var (key, value) in DefaultRequestHeaders) {
+ if (request.Headers.Contains(key)) continue;
+ request.Headers.Add(key, value);
+ }
request.Options.Set(new HttpRequestOptionsKey<bool>("WebAssemblyEnableStreamingResponse"), true);
+ if (LogRequests)
+ Console.WriteLine("Sending " + request.Summarise(includeHeaders: true, includeQuery: true, includeContentIfText: false, hideHeaders: ["Accept"]));
+
HttpResponseMessage? responseMessage;
try {
responseMessage = await Client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken);
}
catch (Exception e) {
- Console.WriteLine(
- $"Failed to send request {request.Method} {BaseAddress}{request.RequestUri} ({Util.BytesToString(request.Content?.Headers.ContentLength ?? 0)}):\n{e}");
+ // if (attempt >= 5) {
+ // Console.WriteLine(
+ // $"Failed to send request {request.Method} {BaseAddress}{request.RequestUri} ({Util.BytesToString(request.Content?.Headers.ContentLength ?? 0)}):\n{e}");
+ // throw;
+ // }
+ //
+ // if (e is TaskCanceledException or TimeoutException or HttpRequestException) {
+ // if (request.Method == HttpMethod.Get && !cancellationToken.IsCancellationRequested) {
+ // await Task.Delay(Random.Shared.Next(100, 1000), cancellationToken);
+ // request.ResetSendStatus();
+ // return await SendUnhandledAsync(request, cancellationToken, attempt + 1);
+ // }
+ // }
+ // else if (!e.ToString().StartsWith("TypeError: NetworkError"))
+ // Console.WriteLine(
+ // $"Failed to send request {request.Method} {BaseAddress}{request.RequestUri} ({Util.BytesToString(request.Content?.Headers.ContentLength ?? 0)}):\n{e}");
+
throw;
}
#if SYNC_HTTPCLIENT
@@ -97,8 +126,26 @@ public class MatrixHttpClient {
}
#endif
- Console.WriteLine(
- $"Sending {request.Method} {request.RequestUri} ({Util.BytesToString(request.Content?.Headers.ContentLength ?? 0)}) -> {(int)responseMessage.StatusCode} {responseMessage.StatusCode} ({Util.BytesToString(responseMessage.Content.Headers.ContentLength ?? 0)})");
+ // Console.WriteLine($"Sending {request.Method} {request.RequestUri} ({Util.BytesToString(request.Content?.Headers.ContentLength ?? 0)}) -> {(int)responseMessage.StatusCode} {responseMessage.StatusCode} ({Util.BytesToString(responseMessage.GetContentLength())}, WAIT={swWait.ElapsedMilliseconds}ms, EXEC={swExec.ElapsedMilliseconds}ms)");
+ if (LogRequests)
+ Console.WriteLine("Received " + responseMessage.Summarise(includeHeaders: true, includeContentIfText: false, hideHeaders: [
+ "Server",
+ "Date",
+ "Transfer-Encoding",
+ "Connection",
+ "Vary",
+ "Content-Length",
+ "Access-Control-Allow-Origin",
+ "Access-Control-Allow-Methods",
+ "Access-Control-Allow-Headers",
+ "Access-Control-Expose-Headers",
+ "Cache-Control",
+ "Cross-Origin-Resource-Policy",
+ "X-Content-Security-Policy",
+ "Referrer-Policy",
+ "X-Robots-Tag",
+ "Content-Security-Policy"
+ ]));
return responseMessage;
}
@@ -107,6 +154,12 @@ public class MatrixHttpClient {
var responseMessage = await SendUnhandledAsync(request, cancellationToken);
if (responseMessage.IsSuccessStatusCode) return responseMessage;
+ //retry on gateway timeout
+ // if (responseMessage.StatusCode == HttpStatusCode.GatewayTimeout) {
+ // request.ResetSendStatus();
+ // return await SendAsync(request, cancellationToken);
+ // }
+
//error handling
var content = await responseMessage.Content.ReadAsStringAsync(cancellationToken);
if (content.Length == 0)
@@ -114,10 +167,15 @@ public class MatrixHttpClient {
ErrorCode = "M_UNKNOWN",
Error = "Unknown error, server returned no content"
};
- if (!content.StartsWith('{')) throw new InvalidDataException("Encountered invalid data:\n" + content);
+
+ // if (!content.StartsWith('{')) throw new InvalidDataException("Encountered invalid data:\n" + content);
+ if (!content.TrimStart().StartsWith('{')) {
+ responseMessage.EnsureSuccessStatusCode();
+ throw new InvalidDataException("Encountered invalid data:\n" + content);
+ }
//we have a matrix error
- MatrixException? ex = null;
+ MatrixException? ex;
try {
ex = JsonSerializer.Deserialize<MatrixException>(content);
}
@@ -131,7 +189,7 @@ public class MatrixHttpClient {
Debug.Assert(ex != null, nameof(ex) + " != null");
ex.RawContent = content;
// Console.WriteLine($"Failed to send request: {ex}");
- if (ex?.RetryAfterMs is null) throw ex!;
+ if (ex.RetryAfterMs is null) throw ex!;
//we have a ratelimit error
await Task.Delay(ex.RetryAfterMs.Value, cancellationToken);
request.ResetSendStatus();
@@ -170,7 +228,7 @@ public class MatrixHttpClient {
}
// GetStreamAsync
- public new async Task<Stream> GetStreamAsync(string requestUri, CancellationToken cancellationToken = default) {
+ public async Task<Stream> GetStreamAsync(string requestUri, CancellationToken cancellationToken = default) {
var request = new HttpRequestMessage(HttpMethod.Get, requestUri);
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
var response = await SendAsync(request, cancellationToken);
@@ -209,7 +267,7 @@ public class MatrixHttpClient {
await foreach (var resp in result) yield return resp;
}
- public async Task<bool> CheckSuccessStatus(string url) {
+ public static async Task<bool> CheckSuccessStatus(string url) {
//cors causes failure, try to catch
try {
var resp = await Client.GetAsync(url);
@@ -227,5 +285,17 @@ public class MatrixHttpClient {
};
return await SendAsync(request, cancellationToken);
}
+
+ public async Task<HttpResponseMessage> DeleteAsync(string url) {
+ var request = new HttpRequestMessage(HttpMethod.Delete, url);
+ return await SendAsync(request);
+ }
+
+ public async Task<HttpResponseMessage> DeleteAsJsonAsync<T>(string url, T payload) {
+ var request = new HttpRequestMessage(HttpMethod.Delete, url) {
+ Content = new StringContent(JsonSerializer.Serialize(payload), Encoding.UTF8, "application/json")
+ };
+ return await SendAsync(request);
+ }
}
#endif
\ No newline at end of file
diff --git a/LibMatrix/Extensions/UnicodeJsonEncoder.cs b/LibMatrix/Extensions/UnicodeJsonEncoder.cs
new file mode 100644
index 0000000..ae58263
--- /dev/null
+++ b/LibMatrix/Extensions/UnicodeJsonEncoder.cs
@@ -0,0 +1,173 @@
+// LibMatrix: File sourced from https://github.com/dotnet/runtime/pull/87147/files under the MIT license.
+
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Text;
+using System.Text.Encodings.Web;
+
+namespace LibMatrix.Extensions;
+
+internal sealed class UnicodeJsonEncoder : JavaScriptEncoder
+{
+ internal static readonly UnicodeJsonEncoder Singleton = new UnicodeJsonEncoder();
+
+ private readonly bool _preferHexEscape;
+ private readonly bool _preferUppercase;
+
+ public UnicodeJsonEncoder()
+ : this(preferHexEscape: false, preferUppercase: false)
+ {
+ }
+
+ public UnicodeJsonEncoder(bool preferHexEscape, bool preferUppercase)
+ {
+ _preferHexEscape = preferHexEscape;
+ _preferUppercase = preferUppercase;
+ }
+
+ public override int MaxOutputCharactersPerInputCharacter => 6; // "\uXXXX" for a single char ("\uXXXX\uYYYY" [12 chars] for supplementary scalar value)
+
+ public override unsafe int FindFirstCharacterToEncode(char* text, int textLength)
+ {
+ for (int index = 0; index < textLength; ++index)
+ {
+ char value = text[index];
+
+ if (NeedsEncoding(value))
+ {
+ return index;
+ }
+ }
+
+ return -1;
+ }
+
+ public override unsafe bool TryEncodeUnicodeScalar(int unicodeScalar, char* buffer, int bufferLength, out int numberOfCharactersWritten)
+ {
+ bool encode = WillEncode(unicodeScalar);
+
+ if (!encode)
+ {
+ Span<char> span = new Span<char>(buffer, bufferLength);
+ int spanWritten;
+ bool succeeded = new Rune(unicodeScalar).TryEncodeToUtf16(span, out spanWritten);
+ numberOfCharactersWritten = spanWritten;
+ return succeeded;
+ }
+
+ if (!_preferHexEscape && unicodeScalar <= char.MaxValue && HasTwoCharacterEscape((char)unicodeScalar))
+ {
+ if (bufferLength < 2)
+ {
+ numberOfCharactersWritten = 0;
+ return false;
+ }
+
+ buffer[0] = '\\';
+ buffer[1] = GetTwoCharacterEscapeSuffix((char)unicodeScalar);
+ numberOfCharactersWritten = 2;
+ return true;
+ }
+ else
+ {
+ if (bufferLength < 6)
+ {
+ numberOfCharactersWritten = 0;
+ return false;
+ }
+
+ buffer[0] = '\\';
+ buffer[1] = 'u';
+ buffer[2] = '0';
+ buffer[3] = '0';
+ buffer[4] = ToHexDigit((unicodeScalar & 0xf0) >> 4, _preferUppercase);
+ buffer[5] = ToHexDigit(unicodeScalar & 0xf, _preferUppercase);
+ numberOfCharactersWritten = 6;
+ return true;
+ }
+ }
+
+ public override bool WillEncode(int unicodeScalar)
+ {
+ if (unicodeScalar > char.MaxValue)
+ {
+ return false;
+ }
+
+ return NeedsEncoding((char)unicodeScalar);
+ }
+
+ // https://datatracker.ietf.org/doc/html/rfc8259#section-7
+ private static bool NeedsEncoding(char value)
+ {
+ if (value == '"' || value == '\\')
+ {
+ return true;
+ }
+
+ return value <= '\u001f';
+ }
+
+ private static bool HasTwoCharacterEscape(char value)
+ {
+ // RFC 8259, Section 7, "char = " BNF
+ switch (value)
+ {
+ case '"':
+ case '\\':
+ case '/':
+ case '\b':
+ case '\f':
+ case '\n':
+ case '\r':
+ case '\t':
+ return true;
+ default:
+ return false;
+ }
+ }
+
+ private static char GetTwoCharacterEscapeSuffix(char value)
+ {
+ // RFC 8259, Section 7, "char = " BNF
+ switch (value)
+ {
+ case '"':
+ return '"';
+ case '\\':
+ return '\\';
+ case '/':
+ return '/';
+ case '\b':
+ return 'b';
+ case '\f':
+ return 'f';
+ case '\n':
+ return 'n';
+ case '\r':
+ return 'r';
+ case '\t':
+ return 't';
+ default:
+ throw new ArgumentOutOfRangeException(nameof(value));
+ }
+ }
+
+ private static char ToHexDigit(int value, bool uppercase)
+ {
+ if (value > 0xf)
+ {
+ throw new ArgumentOutOfRangeException(nameof(value));
+ }
+
+ if (value < 10)
+ {
+ return (char)(value + '0');
+ }
+ else
+ {
+ return (char)(value - 0xa + (uppercase ? 'A' : 'a'));
+ }
+ }
+}
\ No newline at end of file
|
