private static void UnicodeGetLowerKeySliceAndStorageKey(JsonOperationContext context, string str,
out byte *lowerKey, out int lowerSize,
out byte *key, out int keySize)
{
// See comment in GetLowerKeySliceAndStorageKey for the format
_jsonParserState.Reset();
var byteCount = Utf8.GetMaxByteCount(str.Length);
_jsonParserState.FindEscapePositionsIn(str);
var maxKeyLenSize = JsonParserState.VariableSizeIntSize(byteCount);
var escapePositionsSize = _jsonParserState.GetEscapePositionsSize();
var buffer = context.GetNativeTempBuffer(
sizeof(char) * str.Length // for the lower calls
+ byteCount // lower key
+ maxKeyLenSize // the size of var int for the len of the key
+ byteCount // actual key
+ escapePositionsSize);
fixed(char *pChars = str)
{
var destChars = (char *)buffer;
for (var i = 0; i < str.Length; i++)
{
destChars[i] = char.ToLowerInvariant(pChars[i]);
}
lowerKey = buffer + str.Length * sizeof(char);
lowerSize = Utf8.GetBytes(destChars, str.Length, lowerKey, byteCount);
if (lowerSize > 512)
{
ThrowKeyTooBig(str);
}
key = buffer + str.Length * sizeof(char) + byteCount;
var writePos = key;
keySize = Utf8.GetBytes(pChars, str.Length, writePos + maxKeyLenSize, byteCount);
var actualKeyLenSize = JsonParserState.VariableSizeIntSize(keySize);
if (actualKeyLenSize < maxKeyLenSize)
{
var movePtr = maxKeyLenSize - actualKeyLenSize;
key += movePtr;
writePos += movePtr;
}
JsonParserState.WriteVariableSizeInt(ref writePos, keySize);
_jsonParserState.WriteEscapePositionsTo(writePos + keySize);
keySize += escapePositionsSize + maxKeyLenSize;
}
}
private void SetStringBuffer(string str)
{
// max possible size - we avoid using GetByteCount because profiling showed it to take 2% of runtime
// the buffer might be a bit longer, but we'll reuse it, and it is better than the computing cost
int size = Encoding.UTF8.GetMaxByteCount(str.Length);
_state.FindEscapePositionsIn(str);
size += _state.GetEscapePositionsSize();
_state.StringBuffer = _ctx.GetNativeTempBuffer(size);
fixed(char *pChars = str)
{
_state.StringSize = Utf8Encoding.GetBytes(pChars, str.Length, _state.StringBuffer, size);
var escapePos = _state.StringBuffer + _state.StringSize;
_state.WriteEscapePositionsTo(escapePos);
}
}
public unsafe StringCollectionValue(List <string> values, JsonOperationContext context)
{
#if DEBUG
_values = values;
#endif
if (values.Count == 0)
{
ThrowEmptyFacets();
}
_hashCode = values.Count;
_hash = (uint)values.Count;
int size = 0;
foreach (var value in values)
{
size += value.Length;
}
var buffer = context.GetNativeTempBuffer(size * sizeof(char));
var destChars = (char *)buffer;
var position = 0;
foreach (var value in values)
{
for (var i = 0; i < value.Length; i++)
{
destChars[position++] = value[i];
}
unchecked
{
_hashCode = _hashCode * 397 ^ value.GetHashCode();
}
}
_hash = Hashing.XXHash32.Calculate(buffer, size);
}
private static unsafe uint CalculateQueryFieldsHash(FacetQuery query, JsonOperationContext context)
{
int size = 0;
// ReSharper disable once LoopCanBeConvertedToQuery
foreach (var s in query.FieldsToFetch)
{
size += s.Length;
}
var buffer = context.GetNativeTempBuffer(size * sizeof(char));
var destChars = (char *)buffer;
var position = 0;
foreach (var field in query.FieldsToFetch)
{
for (var i = 0; i < field.Length; i++)
{
destChars[position++] = field[i];
}
}
return(Hashing.XXHash32.Calculate(buffer, size));
}
public static void GetLowerKeySliceAndStorageKey(JsonOperationContext context, string str, out byte *lowerKey,
out int lowerSize,
out byte *key,
out int keySize)
{
// Because we need to also store escape positions for the key when we store it
// we need to store it as a lazy string value.
// But lazy string value has two lengths, one is the string length, and the other
// is the actual data size with the escape positions
// In order to resolve this, we process the key to find escape positions, then store it
// in the table using the following format:
//
// [var int - string len, string bytes, number of escape positions, escape positions]
//
// The total length of the string is stored in the actual table (and include the var int size
// prefix.
if (_jsonParserState == null)
{
_jsonParserState = new JsonParserState();
}
_jsonParserState.Reset();
keySize = JsonParserState.VariableSizeIntSize(str.Length);
_jsonParserState.FindEscapePositionsIn(str);
var escapePositionsSize = _jsonParserState.GetEscapePositionsSize();
var buffer = context.GetNativeTempBuffer(
str.Length // lower key
+ keySize // the size of var int for the len of the key
+ str.Length // actual key
+ escapePositionsSize);
for (var i = 0; i < str.Length; i++)
{
var ch = str[i];
if (ch > 127) // not ASCII, use slower mode
{
goto UnlikelyUnicode;
}
if ((ch >= 65) && (ch <= 90))
{
buffer[i] = (byte)(ch | 0x20);
}
else
{
buffer[i] = (byte)ch;
}
buffer[i + keySize + str.Length] = (byte)ch;
}
var writePos = buffer + str.Length;
JsonParserState.WriteVariableSizeInt(ref writePos, str.Length);
_jsonParserState.WriteEscapePositionsTo(writePos + str.Length);
keySize = escapePositionsSize + str.Length + keySize;
key = buffer + str.Length;
lowerKey = buffer;
lowerSize = str.Length;
return;
UnlikelyUnicode:
UnicodeGetLowerKeySliceAndStorageKey(context, str, out lowerKey, out lowerSize, out key, out keySize);
}
