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Utf8JsonWriterTests.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System.Buffers;
using System.Buffers.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.IO.Pipelines;
using System.Text.Encodings.Web;
using System.Text.Unicode;
using System.Threading;
using System.Threading.Tasks;
using Newtonsoft.Json;
using Xunit;
namespace System.Text.Json.Tests
{
public class Utf8JsonWriterTests
{
private const int MaxExpansionFactorWhileEscaping = 6;
private const int MaxEscapedTokenSize = 1_000_000_000; // Max size for already escaped value.
private const int MaxUnescapedTokenSize = MaxEscapedTokenSize / MaxExpansionFactorWhileEscaping; // 166_666_666 bytes
public static bool IsX64 { get; } = IntPtr.Size >= 8;
[Theory]
[InlineData(true, true)]
[InlineData(true, false)]
[InlineData(false, true)]
[InlineData(false, false)]
public void NullCtor(bool formatted, bool skipValidation)
{
var options = new JsonWriterOptions { Indented = formatted, SkipValidation = skipValidation };
Assert.Throws<ArgumentNullException>(() => new Utf8JsonWriter((Stream)null));
Assert.Throws<ArgumentNullException>(() => new Utf8JsonWriter((IBufferWriter<byte>)null));
Assert.Throws<ArgumentNullException>(() => new Utf8JsonWriter((Stream)null, options));
Assert.Throws<ArgumentNullException>(() => new Utf8JsonWriter((IBufferWriter<byte>)null, options));
}
[Theory]
[InlineData(true, true)]
[InlineData(true, false)]
[InlineData(false, true)]
[InlineData(false, false)]
public void CantWriteToNonWritableStream(bool formatted, bool skipValidation)
{
var options = new JsonWriterOptions { Indented = formatted, SkipValidation = skipValidation };
var stream = new MemoryStream();
stream.Dispose();
Assert.Throws<ArgumentException>(() => new Utf8JsonWriter(stream));
Assert.Throws<ArgumentException>(() => new Utf8JsonWriter(stream, options));
}
[Fact]
public static void WritingNullStringsWithCustomEscaping()
{
var writerOptions = new JsonWriterOptions();
WriteNullStringsHelper(writerOptions);
writerOptions = new JsonWriterOptions { Encoder = JavaScriptEncoder.Default };
WriteNullStringsHelper(writerOptions);
writerOptions = new JsonWriterOptions { Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping };
WriteNullStringsHelper(writerOptions);
}
[Fact]
public static void WritingNullStringsWithBuggyJavascriptEncoder()
{
var writerOptions = new JsonWriterOptions { Encoder = new BuggyJavaScriptEncoder() };
WriteNullStringsHelper(writerOptions);
}
private static void WriteNullStringsHelper(JsonWriterOptions writerOptions)
{
var output = new ArrayBufferWriter<byte>();
string str = null;
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue(str);
}
JsonTestHelper.AssertContents("null", output);
output.Clear();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue(str.AsSpan());
}
JsonTestHelper.AssertContents("\"\"", output);
byte[] utf8Str = null;
output.Clear();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue(utf8Str.AsSpan());
}
JsonTestHelper.AssertContents("\"\"", output);
JsonEncodedText jsonText = JsonEncodedText.Encode(utf8Str.AsSpan());
output.Clear();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue(jsonText);
}
JsonTestHelper.AssertContents("\"\"", output);
}
public class BuggyJavaScriptEncoder : JavaScriptEncoder
{
public override int MaxOutputCharactersPerInputCharacter => throw new NotImplementedException();
public override unsafe int FindFirstCharacterToEncode(char* text, int textLength)
{
// Access the text pointer even though it might be null and text length is 0.
return *text;
}
public override unsafe bool TryEncodeUnicodeScalar(int unicodeScalar, char* buffer, int bufferLength, out int numberOfCharactersWritten)
{
numberOfCharactersWritten = 0;
return false;
}
public override bool WillEncode(int unicodeScalar) => false;
}
[Fact]
public static void WritingStringsWithCustomEscaping()
{
var output = new ArrayBufferWriter<byte>();
var writerOptions = new JsonWriterOptions { Encoder = JavaScriptEncoder.UnsafeRelaxedJsonEscaping };
using (var writer = new Utf8JsonWriter(output))
{
writer.WriteStringValue("\u6D4B\u8A6611");
}
JsonTestHelper.AssertContents("\"\\u6D4B\\u8A6611\"", output);
output.Clear();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue("\u6D4B\u8A6611");
}
JsonTestHelper.AssertContents("\"\u6D4B\u8A6611\"", output);
output.Clear();
using (var writer = new Utf8JsonWriter(output))
{
writer.WriteStringValue("\u00E9\"");
}
JsonTestHelper.AssertContents("\"\\u00E9\\u0022\"", output);
output.Clear();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue("\u00E9\"");
}
JsonTestHelper.AssertContents("\"\u00E9\\\"\"", output);
output.Clear();
using (var writer = new Utf8JsonWriter(output))
{
writer.WriteStringValue("\u2020\"");
}
JsonTestHelper.AssertContents("\"\\u2020\\u0022\"", output);
output.Clear();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue("\u2020\"");
}
JsonTestHelper.AssertContents("\"\u2020\\\"\"", output);
}
[Theory]
[MemberData(nameof(EscapingTestData))]
public void EscapingTestWhileWriting(char replacementChar, JavaScriptEncoder encoder, bool requiresEscaping)
{
var writerOptions = new JsonWriterOptions { Encoder = encoder };
{
ReadOnlyMemory<byte> written = WriteStringHelper(writerOptions, null);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
written = WriteUtf8StringHelper(writerOptions, null);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
written = WriteStringHelper(writerOptions, string.Empty);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
written = WriteUtf8StringHelper(writerOptions, Array.Empty<byte>());
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
}
var random = new Random(42);
for (int dataLength = 0; dataLength < 50; dataLength++)
{
char[] str = new char[dataLength];
for (int i = 0; i < dataLength; i++)
{
str[i] = (char)random.Next(97, 123);
}
string baseStr = new string(str);
byte[] sourceUtf8 = Encoding.UTF8.GetBytes(baseStr);
ReadOnlyMemory<byte> written = WriteStringHelper(writerOptions, baseStr);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
for (int i = 0; i < dataLength; i++)
{
char[] changed = baseStr.ToCharArray();
changed[i] = replacementChar;
string newStr = new string(changed);
sourceUtf8 = Encoding.UTF8.GetBytes(newStr);
written = WriteStringHelper(writerOptions, newStr);
int escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(requiresEscaping ? (i + 1) : -1, escapedIndex); // Account for the start quote
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(requiresEscaping ? (i + 1) : -1, escapedIndex); // Account for the start quote
}
if (dataLength != 0)
{
char[] changed = baseStr.ToCharArray();
changed.AsSpan().Fill(replacementChar);
string newStr = new string(changed);
sourceUtf8 = Encoding.UTF8.GetBytes(newStr);
written = WriteStringHelper(writerOptions, newStr);
int escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(requiresEscaping ? 1 : -1, escapedIndex); // Account for the start quote
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(requiresEscaping ? 1 : -1, escapedIndex); // Account for the start quote
}
}
}
public static IEnumerable<object[]> EscapingTestData
{
get
{
return new List<object[]>
{
new object[] { 'a', null, false }, // ASCII not escaped
new object[] { '\u001F', null, true }, // control character within single byte range
new object[] { '\u2000', null, true }, // space character outside single byte range
new object[] { '\u00A2', null, true }, // non-ASCII but < 255
new object[] { '\uA686', null, true }, // non-ASCII above short.MaxValue
new object[] { '\u6C49', null, true }, // non-ASCII from chinese alphabet - multibyte
new object[] { '"', null, true }, // ASCII but must always be escaped in JSON
new object[] { '\\', null, true }, // ASCII but must always be escaped in JSON
new object[] { '<', null, true }, // ASCII but escaped by default
new object[] { '>', null, true }, // ASCII but escaped by default
new object[] { '&', null, true }, // ASCII but escaped by default
new object[] { '`', null, true }, // ASCII but escaped by default
new object[] { '\'', null, true }, // ASCII but escaped by default
new object[] { '+', null, true }, // ASCII but escaped by default
new object[] { 'a', JavaScriptEncoder.Default, false },
new object[] { '\u001F', JavaScriptEncoder.Default, true },
new object[] { '\u2000', JavaScriptEncoder.Default, true },
new object[] { '\u00A2', JavaScriptEncoder.Default, true },
new object[] { '\uA686', JavaScriptEncoder.Default, true },
new object[] { '\u6C49', JavaScriptEncoder.Default, true },
new object[] { '"', JavaScriptEncoder.Default, true },
new object[] { '\\', JavaScriptEncoder.Default, true },
new object[] { '<', JavaScriptEncoder.Default, true },
new object[] { '>', JavaScriptEncoder.Default, true },
new object[] { '&', JavaScriptEncoder.Default, true },
new object[] { '`', JavaScriptEncoder.Default, true },
new object[] { '\'', JavaScriptEncoder.Default, true },
new object[] { '+', JavaScriptEncoder.Default, true },
new object[] { 'a', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), false },
new object[] { '\u001F', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '\u2000', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '\u00A2', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '\uA686', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '\u6C49', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '"', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '\\', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '<', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '>', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '&', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '`', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '\'', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '+', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { 'a', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\u001F', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\u2000', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\u00A2', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\uA686', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\u6C49', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '"', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\\', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '<', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '>', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '&', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '`', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\'', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '+', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { 'a', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\u001F', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '\u2000', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '\u00A2', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\uA686', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\u6C49', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '"', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '\\', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '<', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '>', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '&', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '`', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\'', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '+', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
};
}
}
[Theory]
[MemberData(nameof(EscapingTestData_NonAscii))]
public unsafe void WriteString_NonAscii(char replacementChar, JavaScriptEncoder encoder, bool requiresEscaping)
{
var writerOptions = new JsonWriterOptions { Encoder = encoder };
var random = new Random(42);
for (int dataLength = 1; dataLength < 50; dataLength++)
{
char[] str = new char[dataLength];
for (int i = 0; i < dataLength; i++)
{
str[i] = (char)random.Next(0x2E9B, 0x2EF4); // CJK Radicals Supplement characters
}
string baseStr = new string(str);
byte[] sourceUtf8 = Encoding.UTF8.GetBytes(baseStr);
ReadOnlyMemory<byte> written = WriteStringHelper(writerOptions, baseStr);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
for (int i = 0; i < dataLength; i++)
{
string source = baseStr.Insert(i, new string(replacementChar, 1));
sourceUtf8 = Encoding.UTF8.GetBytes(source);
written = WriteStringHelper(writerOptions, source);
int escapedIndex = written.Span.IndexOf((byte)'\\');
// Each CJK character expands to 3 utf-8 bytes.
Assert.Equal(requiresEscaping ? ((i * 3) + 1) : -1, escapedIndex); // Account for the start quote
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
escapedIndex = written.Span.IndexOf((byte)'\\');
// Each CJK character expands to 3 utf-8 bytes.
Assert.Equal(requiresEscaping ? ((i * 3) + 1) : -1, escapedIndex); // Account for the start quote
}
}
}
public static IEnumerable<object[]> EscapingTestData_NonAscii
{
get
{
return new List<object[]>
{
new object[] { 'a', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\u001F', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\u2000', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\u00A2', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\uA686', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\u6C49', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '"', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\\', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '<', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '>', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '&', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '`', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '\'', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { '+', JavaScriptEncoder.Create(UnicodeRanges.All), true },
new object[] { 'a', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\u001F', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '\u2000', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '\u00A2', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\uA686', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\u6C49', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '"', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '\\', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, true },
new object[] { '<', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '>', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '&', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '`', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\'', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '+', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
};
}
}
[Theory]
[MemberData(nameof(JavaScriptEncoders))]
public void EscapingTestWhileWritingSurrogate(JavaScriptEncoder encoder)
{
char highSurrogate = '\uD801';
char lowSurrogate = '\uDC37';
var writerOptions = new JsonWriterOptions { Encoder = encoder };
var random = new Random(42);
for (int dataLength = 2; dataLength < 50; dataLength++)
{
char[] str = new char[dataLength];
for (int i = 0; i < dataLength; i++)
{
str[i] = (char)random.Next(97, 123);
}
string baseStr = new string(str);
byte[] sourceUtf8 = Encoding.UTF8.GetBytes(baseStr);
ReadOnlyMemory<byte> written = WriteStringHelper(writerOptions, baseStr);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
Assert.Equal(-1, written.Span.IndexOf((byte)'\\'));
for (int i = 0; i < dataLength - 1; i++)
{
char[] changed = baseStr.ToCharArray();
changed[i] = highSurrogate;
changed[i + 1] = lowSurrogate;
string newStr = new string(changed);
sourceUtf8 = Encoding.UTF8.GetBytes(newStr);
written = WriteStringHelper(writerOptions, newStr);
int escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(i + 1, escapedIndex); // Account for the start quote
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(i + 1, escapedIndex); // Account for the start quote
}
{
char[] changed = baseStr.ToCharArray();
for (int i = 0; i < changed.Length - 1; i += 2)
{
changed[i] = highSurrogate;
changed[i + 1] = lowSurrogate;
}
string newStr = new string(changed);
sourceUtf8 = Encoding.UTF8.GetBytes(newStr);
written = WriteStringHelper(writerOptions, newStr);
int escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(1, escapedIndex); // Account for the start quote
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
escapedIndex = written.Span.IndexOf((byte)'\\');
Assert.Equal(1, escapedIndex); // Account for the start quote
}
}
}
public static IEnumerable<object[]> JavaScriptEncoders
{
get
{
return new List<object[]>
{
new object[] { null },
new object[] { JavaScriptEncoder.Default },
new object[] { JavaScriptEncoder.Create(UnicodeRanges.BasicLatin) },
new object[] { JavaScriptEncoder.Create(UnicodeRanges.All) },
new object[] { JavaScriptEncoder.UnsafeRelaxedJsonEscaping },
};
}
}
[Theory]
[MemberData(nameof(InvalidEscapingTestData))]
public unsafe void WriteStringInvalidCharacter(char replacementChar, JavaScriptEncoder encoder, bool requiresEscaping)
{
var writerOptions = new JsonWriterOptions { Encoder = encoder };
var random = new Random(42);
for (int dataLength = 0; dataLength < 47; dataLength++)
{
char[] str = new char[dataLength];
for (int i = 0; i < dataLength; i++)
{
str[i] = (char)random.Next(97, 123);
}
string baseStr = new string(str);
byte[] baseStrUtf8 = Encoding.UTF8.GetBytes(baseStr);
for (int i = 0; i < dataLength; i++)
{
char[] changed = baseStr.ToCharArray();
changed[i] = replacementChar;
string source = new string(changed);
byte[] sourceUtf8 = new byte[baseStrUtf8.Length];
baseStrUtf8.AsSpan().CopyTo(sourceUtf8);
sourceUtf8[i] = 0xC3; // Invalid, first byte of a 2-byte utf-8 character
ReadOnlyMemory<byte> written = WriteStringHelper(writerOptions, source);
// Some encoders don't escape replacement character
Assert.Equal(requiresEscaping ? i + 1 : -1, written.Span.IndexOf((byte)'\\')); // Account for the start quote
written = WriteUtf8StringHelper(writerOptions, sourceUtf8);
// Some encoders don't escape replacement character
Assert.Equal(requiresEscaping ? i + 1 : -1, written.Span.IndexOf((byte)'\\')); // Account for the start quote
}
}
}
public static IEnumerable<object[]> InvalidEscapingTestData
{
get
{
return new List<object[]>
{
new object[] { '\uD801', JavaScriptEncoder.Default, true }, // Invalid, high surrogate alone
new object[] { '\uDC01', JavaScriptEncoder.Default, true }, // Invalid, low surrogate alone
new object[] { '\uD801', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\uDC01', JavaScriptEncoder.UnsafeRelaxedJsonEscaping, false },
new object[] { '\uD801', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\uDC01', JavaScriptEncoder.Create(UnicodeRanges.All), false },
new object[] { '\uD801', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
new object[] { '\uDC01', JavaScriptEncoder.Create(UnicodeRanges.BasicLatin), true },
};
}
}
private static ReadOnlyMemory<byte> WriteStringHelper(JsonWriterOptions writerOptions, string str)
{
var output = new ArrayBufferWriter<byte>();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue(str);
}
return output.WrittenMemory;
}
private static ReadOnlyMemory<byte> WriteUtf8StringHelper(JsonWriterOptions writerOptions, byte[] utf8str)
{
var output = new ArrayBufferWriter<byte>();
using (var writer = new Utf8JsonWriter(output, writerOptions))
{
writer.WriteStringValue(utf8str);
}
return output.WrittenMemory;
}
[Fact]
public void WriteJsonWritesToIBWOnDemand_Dispose()
{
var output = new ArrayBufferWriter<byte>();
var writer = new Utf8JsonWriter(output);
WriteLargeArrayOfStrings(writer, 1_000);
Assert.Equal(17347, writer.BytesCommitted);
Assert.Equal(5544, writer.BytesPending);
Assert.Equal(0, writer.CurrentDepth);
Assert.Equal(17347, output.WrittenCount);
writer.Dispose();
Assert.Equal(0, writer.BytesPending);
Assert.Equal(22891, output.WrittenCount);
JsonTestHelper.AssertContents(GetExpectedLargeArrayOfStrings(1_000), output);
}
[Fact]
public void WriteJsonOnlyWritesToStreamOnDemand_Dispose()
{
string expectedString = GetExpectedLargeArrayOfStrings(1_000);
Assert.Equal(22891, expectedString.Length);
using (var stream = new MemoryStream())
{
var writer = new Utf8JsonWriter(stream);
WriteLargeArrayOfStrings(writer, 1_000);
Assert.Equal(0, writer.BytesCommitted);
Assert.Equal(expectedString.Length, writer.BytesPending);
Assert.Equal(0, writer.CurrentDepth);
// Unless user disposes the writer or calls flush/flushasync explicitly, nothing gets written to the stream
Assert.Equal(0, stream.Position);
writer.Dispose();
Assert.Equal(0, writer.BytesPending);
Assert.Equal(expectedString.Length, stream.Position);
JsonTestHelper.AssertContents(expectedString, stream);
}
}
[Fact]
public async Task WriteJsonOnlyWritesToStreamOnDemand_DisposeAsync()
{
string expectedString = GetExpectedLargeArrayOfStrings(1_000);
Assert.Equal(22891, expectedString.Length);
using (var stream = new MemoryStream())
{
var writer = new Utf8JsonWriter(stream);
WriteLargeArrayOfStrings(writer, 1_000);
Assert.Equal(0, writer.BytesCommitted);
Assert.Equal(expectedString.Length, writer.BytesPending);
Assert.Equal(0, writer.CurrentDepth);
// Unless user disposes the writer or calls flush/flushasync explicitly, nothing gets written to the stream
Assert.Equal(0, stream.Position);
await writer.DisposeAsync();
Assert.Equal(0, writer.BytesPending);
Assert.Equal(expectedString.Length, stream.Position);
JsonTestHelper.AssertContents(expectedString, stream);
}
}
[Fact]
public void WriteJsonOnlyWritesToStreamOnDemand_Flush()
{
string expectedString = GetExpectedLargeArrayOfStrings(1_000);
Assert.Equal(22891, expectedString.Length);
using (var stream = new MemoryStream())
{
var writer = new Utf8JsonWriter(stream);
WriteLargeArrayOfStrings(writer, 1_000);
Assert.Equal(0, writer.BytesCommitted);
Assert.Equal(expectedString.Length, writer.BytesPending);
Assert.Equal(0, writer.CurrentDepth);
// Unless user disposes the writer or calls flush/flushasync explicitly, nothing gets written to the stream
Assert.Equal(0, stream.Position);
writer.Flush();
Assert.Equal(0, writer.BytesPending);
Assert.Equal(expectedString.Length, stream.Position);
writer.Dispose();
Assert.Equal(0, writer.BytesPending);
Assert.Equal(expectedString.Length, stream.Position);
JsonTestHelper.AssertContents(expectedString, stream);
}
}
[Fact]
public async Task WriteJsonOnlyWritesToStreamOnDemand_FlushAsync()
{
string expectedString = GetExpectedLargeArrayOfStrings(1_000);
Assert.Equal(22891, expectedString.Length);
using (var stream = new MemoryStream())
{
var writer = new Utf8JsonWriter(stream);
WriteLargeArrayOfStrings(writer, 1_000);
Assert.Equal(0, writer.BytesCommitted);
Assert.Equal(expectedString.Length, writer.BytesPending);
Assert.Equal(0, writer.CurrentDepth);
// Unless user disposes the writer or calls flush/flushasync explicitly, nothing gets written to the stream
Assert.Equal(0, stream.Position);
await writer.FlushAsync();
Assert.Equal(0, writer.BytesPending);
Assert.Equal(expectedString.Length, stream.Position);
await writer.DisposeAsync();
Assert.Equal(0, writer.BytesPending);
Assert.Equal(expectedString.Length, stream.Position);
JsonTestHelper.AssertContents(expectedString, stream);
}
}
private static void WriteLargeArrayOfStrings(Utf8JsonWriter writer, int length)
{
writer.WriteStartArray();
for (int i = 0; i < length; i++)
{
writer.WriteStringValue($"some array value {i}");
}
writer.WriteEndArray();
}
private static string GetExpectedLargeArrayOfStrings(int length)
{
var stringBuilder = new StringBuilder();
using (TextWriter stringWriter = new StringWriter(stringBuilder))
using (var json = new JsonTextWriter(stringWriter))
{
json.Formatting = Formatting.None;
json.WriteStartArray();
for (int i = 0; i < length; i++)
{
json.WriteValue($"some array value {i}");
}
json.WriteEnd();
}
return stringBuilder.ToString();
}
// NOTE: WritingTooLargeProperty test is constrained to run on Windows and MacOSX because it causes
// problems on Linux due to the way deferred memory allocation works. On Linux, the allocation can
// succeed even if there is not enough memory but then the test may get killed by the OOM killer at the
// time the memory is accessed which triggers the full memory allocation.
[PlatformSpecific(TestPlatforms.Windows | TestPlatforms.OSX)]
[ConditionalFact(nameof(IsX64))]
[OuterLoop]
public void WriteLargeJsonToStreamWithoutFlushing()
{
var largeArray = new char[150_000_000];
largeArray.AsSpan().Fill('a');
// Text size chosen so that after several doublings of the underlying buffer we reach ~2 GB (but don't go over)
JsonEncodedText text1 = JsonEncodedText.Encode(largeArray.AsSpan(0, 7_500));
JsonEncodedText text2 = JsonEncodedText.Encode(largeArray.AsSpan(0, 5_000));
JsonEncodedText text3 = JsonEncodedText.Encode(largeArray.AsSpan(0, 150_000_000));
using (var output = new MemoryStream())
using (var writer = new Utf8JsonWriter(output))
{
writer.WriteStartArray();
writer.WriteStringValue(text1);
Assert.Equal(7_503, writer.BytesPending);
for (int i = 0; i < 30_000; i++)
{
writer.WriteStringValue(text2);
}
Assert.Equal(150_097_503, writer.BytesPending);
for (int i = 0; i < 6; i++)
{
writer.WriteStringValue(text3);
}
Assert.Equal(1_050_097_521, writer.BytesPending);
// Next write forces a grow beyond 2 GB
Assert.Throws<OutOfMemoryException>(() => writer.WriteStringValue(text3));
Assert.Equal(1_050_097_521, writer.BytesPending);
var text4 = JsonEncodedText.Encode(largeArray.AsSpan(0, 1));
for (int i = 0; i < 10_000_000; i++)
{
writer.WriteStringValue(text4);
}
Assert.Equal(1_050_097_521 + (4 * 10_000_000), writer.BytesPending);
}
}
[Theory]
[InlineData(true, true)]
[InlineData(true, false)]
[InlineData(false, true)]
[InlineData(false, false)]
public void InitialState(bool formatted, bool skipValidation)
{
var options = new JsonWriterOptions { Indented = formatted, SkipValidation = skipValidation };
var stream = new MemoryStream();
using (var writer = new Utf8JsonWriter(stream, options))
{
Assert.Equal(0, writer.BytesCommitted);
Assert.Equal(0, writer.BytesPending);
Assert.Equal(0, writer.CurrentDepth);
Assert.Null(writer.Options.Encoder);
Assert.Equal(formatted, writer.Options.Indented);
Assert.Equal(skipValidation, writer.Options.SkipValidation);
Assert.Equal(0, stream.Position);
}
var output = new FixedSizedBufferWriter(0);
using (var writer = new Utf8JsonWriter(output, options))
{
Assert.Equal(0, writer.BytesCommitted);
Assert.Equal(0, writer.BytesPending);
Assert.Equal(0, writer.CurrentDepth);
Assert.Null(writer.Options.Encoder);
Assert.Equal(formatted, writer.Options.Indented);
Assert.Equal(skipValidation, writer.Options.SkipValidation);
Assert.Equal(0, output.FormattedCount);
}
}
[Theory]
[InlineData(true, true)]
[InlineData(true, false)]
[InlineData(false, true)]
[InlineData(false, false)]
public void Reset(bool formatted, bool skipValidation)
{
var options = new JsonWriterOptions { Indented = formatted, SkipValidation = skipValidation };
var stream = new MemoryStream();
using var writeToStream = new Utf8JsonWriter(stream, options);
writeToStream.WriteNumberValue(1);
writeToStream.Flush();
Assert.True(writeToStream.BytesCommitted != 0);
writeToStream.Reset();
Assert.Equal(0, writeToStream.BytesCommitted);
Assert.Equal(0, writeToStream.BytesPending);
Assert.Equal(0, writeToStream.CurrentDepth);
Assert.Null(writeToStream.Options.Encoder);
Assert.Equal(formatted, writeToStream.Options.Indented);
Assert.Equal(skipValidation, writeToStream.Options.SkipValidation);
Assert.True(stream.Position != 0);
long previousWritten = stream.Position;
writeToStream.Flush();
Assert.Equal(previousWritten, stream.Position);
var output = new FixedSizedBufferWriter(256);
using var writeToIBW = new Utf8JsonWriter(output, options);
writeToIBW.WriteNumberValue(1);
writeToIBW.Flush();
Assert.True(writeToIBW.BytesCommitted != 0);
writeToIBW.Reset();
Assert.Equal(0, writeToIBW.BytesCommitted);
Assert.Equal(0, writeToIBW.BytesPending);
Assert.Equal(0, writeToIBW.CurrentDepth);
Assert.Null(writeToIBW.Options.Encoder);
Assert.Equal(formatted, writeToIBW.Options.Indented);
Assert.Equal(skipValidation, writeToIBW.Options.SkipValidation);
Assert.True(output.FormattedCount != 0);
previousWritten = output.FormattedCount;
writeToIBW.Flush();
Assert.Equal(previousWritten, output.FormattedCount);
}
[Theory]
[InlineData(true, true)]
[InlineData(true, false)]
[InlineData(false, true)]
[InlineData(false, false)]
public void ResetWithSameOutput(bool formatted, bool skipValidation)
{
var options = new JsonWriterOptions { Indented = formatted, SkipValidation = skipValidation };
var stream = new MemoryStream();
using var writeToStream = new Utf8JsonWriter(stream, options);
writeToStream.WriteNumberValue(1);
writeToStream.Flush();
Assert.True(writeToStream.BytesCommitted != 0);
writeToStream.Reset(stream);
Assert.Equal(0, writeToStream.BytesCommitted);
Assert.Equal(0, writeToStream.BytesPending);
Assert.Equal(0, writeToStream.CurrentDepth);
Assert.Null(writeToStream.Options.Encoder);
Assert.Equal(formatted, writeToStream.Options.Indented);
Assert.Equal(skipValidation, writeToStream.Options.SkipValidation);
Assert.True(stream.Position != 0);
long previousWritten = stream.Position;
writeToStream.Flush();
Assert.Equal(previousWritten, stream.Position);
writeToStream.WriteNumberValue(1);
writeToStream.Flush();
Assert.NotEqual(previousWritten, stream.Position);
Assert.Equal("11", Encoding.UTF8.GetString(stream.ToArray()));
var output = new FixedSizedBufferWriter(257);
using var writeToIBW = new Utf8JsonWriter(output, options);
writeToIBW.WriteNumberValue(1);
writeToIBW.Flush();
Assert.True(writeToIBW.BytesCommitted != 0);
writeToIBW.Reset(output);
Assert.Equal(0, writeToIBW.BytesCommitted);
Assert.Equal(0, writeToIBW.BytesPending);
Assert.Equal(0, writeToIBW.CurrentDepth);
Assert.Null(writeToIBW.Options.Encoder);
Assert.Equal(formatted, writeToIBW.Options.Indented);
Assert.Equal(skipValidation, writeToIBW.Options.SkipValidation);
Assert.True(output.FormattedCount != 0);
previousWritten = output.FormattedCount;
writeToIBW.Flush();
Assert.Equal(previousWritten, output.FormattedCount);
writeToIBW.WriteNumberValue(1);
writeToIBW.Flush();
Assert.NotEqual(previousWritten, output.FormattedCount);
Assert.Equal("11", Encoding.UTF8.GetString(output.Formatted));
}
[Theory]
[InlineData(true, true)]
[InlineData(true, false)]
[InlineData(false, true)]
[InlineData(false, false)]
public void ResetChangeOutputMode(bool formatted, bool skipValidation)
{
var options = new JsonWriterOptions { Indented = formatted, SkipValidation = skipValidation };
var stream = new MemoryStream();
using var writeToStream = new Utf8JsonWriter(stream, options);
writeToStream.WriteNumberValue(1);
writeToStream.Flush();
Assert.True(writeToStream.BytesCommitted != 0);
var output = new FixedSizedBufferWriter(256);
writeToStream.Reset(output);
Assert.Equal(0, writeToStream.BytesCommitted);
Assert.Equal(0, writeToStream.BytesPending);
Assert.Equal(0, writeToStream.CurrentDepth);
Assert.Null(writeToStream.Options.Encoder);
Assert.Equal(formatted, writeToStream.Options.Indented);
Assert.Equal(skipValidation, writeToStream.Options.SkipValidation);
Assert.True(stream.Position != 0);
long previousWrittenStream = stream.Position;
long previousWrittenIBW = output.FormattedCount;
Assert.Equal(0, previousWrittenIBW);
writeToStream.Flush();
Assert.Equal(previousWrittenStream, stream.Position);
Assert.Equal(previousWrittenIBW, output.FormattedCount);
writeToStream.WriteNumberValue(1);
writeToStream.Flush();
Assert.True(writeToStream.BytesCommitted != 0);
Assert.Equal(previousWrittenStream, stream.Position);
Assert.True(output.FormattedCount != 0);
output = new FixedSizedBufferWriter(256);
using var writeToIBW = new Utf8JsonWriter(output, options);
writeToIBW.WriteNumberValue(1);
writeToIBW.Flush();
Assert.True(writeToIBW.BytesCommitted != 0);
stream = new MemoryStream();
writeToIBW.Reset(stream);
Assert.Equal(0, writeToIBW.BytesCommitted);
Assert.Equal(0, writeToIBW.BytesPending);
Assert.Equal(0, writeToIBW.CurrentDepth);
Assert.Null(writeToIBW.Options.Encoder);
Assert.Equal(formatted, writeToIBW.Options.Indented);
Assert.Equal(skipValidation, writeToIBW.Options.SkipValidation);
Assert.True(output.FormattedCount != 0);
previousWrittenStream = stream.Position;
previousWrittenIBW = output.FormattedCount;
Assert.Equal(0, previousWrittenStream);
writeToIBW.Flush();
Assert.Equal(previousWrittenStream, stream.Position);
Assert.Equal(previousWrittenIBW, output.FormattedCount);
writeToIBW.WriteNumberValue(1);
writeToIBW.Flush();
Assert.True(writeToIBW.BytesCommitted != 0);
Assert.Equal(previousWrittenIBW, output.FormattedCount);
Assert.True(stream.Position != 0);
}
[Theory]
[InlineData(true, true)]
[InlineData(true, false)]
[InlineData(false, true)]
[InlineData(false, false)]
public void InvalidReset(bool formatted, bool skipValidation)
{
var options = new JsonWriterOptions { Indented = formatted, SkipValidation = skipValidation };
var stream = new MemoryStream();
using var writeToStream = new Utf8JsonWriter(stream, options);
Assert.Throws<ArgumentNullException>(() => writeToStream.Reset((Stream)null));
Assert.Throws<ArgumentNullException>(() => writeToStream.Reset((IBufferWriter<byte>)null));