private void UnlikelyWriteLargeString(byte *strBuffer, int size, int numberOfEscapeSequences, int escapeSequencePos)
{
var ptr = strBuffer;
EnsureBuffer(1);
_buffer[_pos++] = Quote;
while (numberOfEscapeSequences > 0)
{
numberOfEscapeSequences--;
var bytesToSkip = BlittableJsonReaderBase.ReadVariableSizeInt(ptr, ref escapeSequencePos);
UnlikelyWriteLargeRawString(strBuffer, bytesToSkip);
strBuffer += bytesToSkip;
size -= bytesToSkip + 1 /*for the escaped char we skip*/;
var b = *(strBuffer++);
EnsureBuffer(2);
_buffer[_pos++] = (byte)'\\';
_buffer[_pos++] = GetEscapeCharacter(b);
}
// write remaining (or full string) to the buffer in one shot
UnlikelyWriteLargeRawString(strBuffer, size);
EnsureBuffer(1);
_buffer[_pos++] = Quote;
}
private void UnlikelyWriteEscapeSequences(byte *strBuffer, int size, int numberOfEscapeSequences, int escapeSequencePos)
{
// We ensure our buffer will have enough space to deal with the whole string.
int bufferSize = 2 * numberOfEscapeSequences + size + 1;
EnsureBuffer(bufferSize);
var ptr = strBuffer;
var buffer = _buffer;
while (numberOfEscapeSequences > 0)
{
numberOfEscapeSequences--;
var bytesToSkip = BlittableJsonReaderBase.ReadVariableSizeInt(ptr, ref escapeSequencePos);
WriteRawString(strBuffer, bytesToSkip);
strBuffer += bytesToSkip;
size -= bytesToSkip + 1 /*for the escaped char we skip*/;
var b = *(strBuffer++);
int auxPos = _pos;
buffer[auxPos++] = (byte)'\\';
buffer[auxPos++] = GetEscapeCharacter(b);
_pos = auxPos;
}
// write remaining (or full string) to the buffer in one shot
WriteRawString(strBuffer, size);
}
public void WriteString(LazyCompressedStringValue str)
{
var strBuffer = str.DecompressToTempBuffer(out AllocatedMemoryData allocated, _context);
try
{
var strSrcBuffer = str.Buffer;
var size = str.UncompressedSize;
var escapeSequencePos = str.CompressedSize;
var numberOfEscapeSequences = BlittableJsonReaderBase.ReadVariableSizeInt(strSrcBuffer, ref escapeSequencePos);
// We ensure our buffer will have enough space to deal with the whole string.
int bufferSize = 2 * numberOfEscapeSequences + size + 2;
if (bufferSize >= JsonOperationContext.ManagedPinnedBuffer.Size)
{
goto WriteLargeCompressedString; // OK, do it the slow way instead.
}
EnsureBuffer(bufferSize);
_buffer[_pos++] = Quote;
while (numberOfEscapeSequences > 0)
{
numberOfEscapeSequences--;
var bytesToSkip = BlittableJsonReaderBase.ReadVariableSizeInt(strSrcBuffer, ref escapeSequencePos);
WriteRawString(strBuffer, bytesToSkip);
strBuffer += bytesToSkip;
size -= bytesToSkip + 1 /*for the escaped char we skip*/;
var b = *(strBuffer++);
var auxPos = _pos;
_buffer[auxPos++] = (byte)'\\';
_buffer[auxPos++] = GetEscapeCharacter(b);
_pos = auxPos;
}
// write remaining (or full string) to the buffer in one shot
WriteRawString(strBuffer, size);
_buffer[_pos++] = Quote;
return;
WriteLargeCompressedString:
UnlikelyWriteCompressedString(numberOfEscapeSequences, strSrcBuffer, escapeSequencePos, strBuffer, size);
}
finally
{
if (allocated != null) //precaution
{
_context.ReturnMemory(allocated);
}
}
}
private static unsafe int GetSizeIncludingEscapeSequences(byte *buffer, int size)
{
var escapeSequencePos = size;
// now need to also include the size of the escape positions
var numberOfEscapeSequences = BlittableJsonReaderBase.ReadVariableSizeInt(buffer, ref escapeSequencePos);
for (int i = 0; i < numberOfEscapeSequences; i++)
{
BlittableJsonReaderBase.ReadVariableSizeInt(buffer, ref escapeSequencePos);
}
return(escapeSequencePos);
}
private int GetSizeOfEscapePositions()
{
var escapeSequencePos = CompressedSize;
var numberOfEscapeSequences = BlittableJsonReaderBase.ReadVariableSizeInt(Buffer, ref escapeSequencePos);
while (numberOfEscapeSequences > 0)
{
numberOfEscapeSequences--;
BlittableJsonReaderBase.ReadVariableSizeInt(Buffer, ref escapeSequencePos);
}
var sizeOfEscapePositions = escapeSequencePos - CompressedSize;
return(sizeOfEscapePositions);
}
public void WriteString(LazyStringValue str, bool skipEscaping = false)
{
if (str == null)
{
WriteNull();
return;
}
var size = str.Size;
if (size == 1 && str.IsControlCodeCharacter(out var b))
{
WriteString($@"\u{b:X4}", skipEscaping: true);
return;
}
var strBuffer = str.Buffer;
var escapeSequencePos = size;
var numberOfEscapeSequences = skipEscaping ? 0 : BlittableJsonReaderBase.ReadVariableSizeInt(str.Buffer, ref escapeSequencePos);
// We ensure our buffer will have enough space to deal with the whole string.
int bufferSize = 2 * numberOfEscapeSequences + size + 1;
if (bufferSize >= JsonOperationContext.ManagedPinnedBuffer.Size)
{
UnlikelyWriteLargeString(strBuffer, size, numberOfEscapeSequences, escapeSequencePos); // OK, do it the slow way.
return;
}
EnsureBuffer(size + 2);
_buffer[_pos++] = Quote;
if (numberOfEscapeSequences == 0)
{
// PERF: Fast Path.
WriteRawString(strBuffer, size);
}
else
{
UnlikelyWriteEscapeSequences(strBuffer, size, numberOfEscapeSequences, escapeSequencePos);
}
_buffer[_pos++] = Quote;
}