public static void GetChars_Encoding_ReadOnlySpan_IBufferWriter_ParamChecks()
{
IBufferWriter <char> writer = new ArrayBufferWriter <char>();
Assert.Throws <ArgumentNullException>("encoding", () => EncodingExtensions.GetChars((Encoding)null, ReadOnlySpan <byte> .Empty, writer));
Assert.Throws <ArgumentNullException>("writer", () => EncodingExtensions.GetChars(Encoding.UTF8, ReadOnlySpan <byte> .Empty, (IBufferWriter <char>)null));
}
public static void GetChars_Encoding_ReadOnlySpan_IBufferWriter()
{
ArrayBufferWriter <char> writer = new ArrayBufferWriter <char>();
// First, a small input that goes through the one-shot code path.
ReadOnlySpan <byte> inputData = Encoding.UTF8.GetBytes("Hello");
long charsWritten = EncodingExtensions.GetChars(Encoding.UTF8, inputData, writer);
Assert.Equal(5, charsWritten);
Assert.Equal("Hello", writer.WrittenSpan.ToString());
// Then, a large input that goes through the chunked path.
// We use U+1234 because it's a 3-byte UTF-8 sequence, which means it'll be split in
// several locations by the internal GetBytes chunking logic. This helps us test
// that we're flowing the 'flush' parameter through the system correctly.
writer = new ArrayBufferWriter <char>();
inputData = Encoding.UTF8.GetBytes(new string('\u1234', 5_000_000)).Concat(new byte[] { 0xE0 }).ToArray();
charsWritten = EncodingExtensions.GetChars(Encoding.UTF8, inputData, writer);
Assert.Equal(5_000_001, charsWritten); // 5 MM for data, 1 for replacement char at end
// Now make sure all of the data was decoded properly.
Assert.Equal(
expected: new string('\u1234', 5_000_000) + '\ufffd',
actual: writer.WrittenSpan.ToString());
}
public static void GetChars_Encoding_ReadOnlySequence_IBufferWriter_ParamChecks()
{
ReadOnlySequence <byte> sequence = new ReadOnlySequence <byte>(new byte[0]);
IBufferWriter <char> writer = new ArrayBufferWriter <char>();
Assert.Throws <ArgumentNullException>("encoding", () => EncodingExtensions.GetChars((Encoding)null, sequence, writer));
Assert.Throws <ArgumentNullException>("writer", () => EncodingExtensions.GetChars(Encoding.UTF8, sequence, (IBufferWriter <char>)null));
}
public static void GetChars_Encoding_ReadOnlySequence_IBufferWriter_SingleSegment()
{
ReadOnlySequence <byte> sequence = new ReadOnlySequence <byte>(Encoding.UTF8.GetBytes("Hello"));
ArrayBufferWriter <char> writer = new ArrayBufferWriter <char>();
long charsWritten = EncodingExtensions.GetChars(Encoding.UTF8, sequence, writer);
Assert.Equal(5, charsWritten);
Assert.Equal("Hello", writer.WrittenSpan.ToString());
}
[OuterLoop] // this test takes ~10 seconds on modern hardware since it operates over GBs of data
public static void GetChars_Encoding_ReadOnlySequence_IBufferWriter_LargeMultiSegment()
{
ReadOnlySequence <byte> sequence = GetLargeRepeatingReadOnlySequence <byte>(AllScalarsAsUtf8, 1500); // ~ 6.5bn bytes of UTF-8 input
RepeatingValidatingBufferWriter <char> writer = new RepeatingValidatingBufferWriter <char>(AllScalarsAsUtf16);
long expectedCharsWritten = 1500 * (long)AllScalarsAsUtf16.Length;
long actualCharsWritten = EncodingExtensions.GetChars(Encoding.UTF8, sequence, writer);
Assert.Equal(expectedCharsWritten, actualCharsWritten);
Assert.Equal(expectedCharsWritten, writer.TotalElementsWritten); // our writer will validate as data is written to it
}
public static void GetChars_Encoding_ReadOnlySequence_Span()
{
Span <char> destination = stackalloc char[32];
// First try the single-segment code path.
ReadOnlySequence <byte> sequence = new ReadOnlySequence <byte>(Encoding.UTF8.GetBytes("Hello!"));
Assert.Equal("Hello!", destination.Slice(0, EncodingExtensions.GetChars(Encoding.UTF8, sequence, destination)).ToString());
// Next try the multi-segment code path.
// We've intentionally split multi-byte subsequences here to test flushing mechanisms.
sequence = SequenceFactory.Create(
new byte[] { 0x20 }, // U+0020
new byte[] { 0x61, 0xC2 }, // U+0061 and U+0080 (continues on next line)
new byte[] { 0x80, 0xED }, // (cont.) + U+D7FF (continues on next line)
new byte[] { }, // empty segment, just to make sure we handle it correctly
new byte[] { 0x9F, 0xBF, 0xF4, 0x80 }, // (cont.) + U+100000 (continues on next line)
new byte[] { 0x80, 0x80 }, // (cont.)
new byte[] { 0xC2 }); // leftover data (should be replaced)
Assert.Equal("\u0020\u0061\u0080\ud7ff\U00100000\ufffd", destination.Slice(0, EncodingExtensions.GetChars(Encoding.UTF8, sequence, destination)).ToString());
}
public static void GetChars_Encoding_ReadOnlySequence_Span_ParamChecks()
{
ReadOnlySequence <byte> sequence = new ReadOnlySequence <byte>(new byte[0]);
Assert.Throws <ArgumentNullException>("encoding", () => EncodingExtensions.GetChars((Encoding)null, sequence, Span <char> .Empty));
}