/// <inheritdoc/>
public override int GetCharCount(ReadOnlySpan <byte> bytes)
{
var encoder = new QpEncoder(Settings);
Span <char> outputBuffer = stackalloc char[1024];
int inputOffset = 0;
int inputCount = bytes.Length;
int outputLength = 0;
ConvertStatus convertStatus;
do
{
convertStatus = encoder.ConvertData(bytes, inputOffset, inputCount,
outputBuffer, 0, outputBuffer.Length,
true,
out var inputUsed,
out var outputUsed);
outputLength += outputUsed;
inputOffset += inputUsed;
inputCount -= inputUsed;
} while (!convertStatus);
return(outputLength);
}
/// <inheritdoc/>
public override char[] GetChars(ReadOnlySpan <byte> bytes)
{
// GetChars process the data in two passes, in order to avoid allocating
// temporary storage for the result (which would have to be resized)
int charsRequired = GetCharCount(bytes);
if (charsRequired == 0)
{
return(Array.Empty <char>());
}
var outputChars = new char[charsRequired];
var encoder = new QpEncoder(Settings);
var convertStatus = encoder.ConvertData(bytes, 0, bytes.Length,
outputChars.AsSpan(), 0, outputChars.Length,
true,
out var inputUsed,
out var outputUsed);
System.Diagnostics.Debug.Assert(convertStatus);
System.Diagnostics.Debug.Assert(inputUsed == bytes.Length);
System.Diagnostics.Debug.Assert(outputUsed == outputChars.Length);
return(outputChars);
}
/// <inheritdoc/>
public override unsafe string GetString(ReadOnlySpan <byte> bytes)
{
var encoder = new QpEncoder(Settings);
Span <char> outputBuffer = stackalloc char[1024];
StringBuilder sb = new StringBuilder();
int inputOffset = 0;
int inputCount = bytes.Length;
ConvertStatus convertStatus;
do
{
convertStatus = encoder.ConvertData(bytes, inputOffset, inputCount,
outputBuffer, 0, outputBuffer.Length,
true,
out var inputUsed,
out var outputUsed);
if (outputUsed > 0)
{
fixed(char *charPtr = &outputBuffer[0])
sb.Append(charPtr, outputUsed);
}
inputOffset += inputUsed;
inputCount -= inputUsed;
} while (!convertStatus);
return(sb.ToString());
}
protected override ConvertStatus ConvertData(ReadOnlySpan <byte> inputData, int inputIndex, int inputCount, Span <char> outputData, int outputIndex, int outputCount, bool flush, out int inputUsed, out int outputUsed)
{
return(_encoder.ConvertData(inputData, inputIndex, inputCount,
outputData, outputIndex, outputCount,
flush,
out inputUsed,
out outputUsed));
}