public static ByteStringContext <ByteStringMemoryCache> .ExternalScope GetSliceFromKey <TTransaction>(
TransactionOperationContext <TTransaction> context, string key, out Slice keySlice)
where TTransaction : RavenTransaction
{
var byteCount = Utf8.GetMaxByteCount(key.Length);
var buffer = context.GetNativeTempBuffer(
byteCount // this buffer is allocated to also serve the GetSliceFromUnicodeKey
+ sizeof(char) * key.Length);
if (key.Length > 512)
{
ThrowKeyTooBig(key);
}
for (var i = 0; i < key.Length; i++)
{
var ch = key[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;
}
}
return(Slice.External(context.Allocator, buffer, (ushort)key.Length, out keySlice));
UnlikelyUnicode:
return(GetSliceFromUnicodeKey(context, key, out keySlice, buffer, byteCount));
}