string GetExistingStringImpl(char[] buffer, int start, int length, StringHash hash)
{
var cursor = GetSearchCursor(hash);
while (cursor.MightHaveMore)
{
var value = cursor.NextString();
if (value != null && UnsafeStringComparer.AreEqual(value, buffer, start, length))
{
return(value);
}
}
return(null);
}
/// <summary>
/// Uses the characters from a buffer to check whether a string exists in the set, and retrieve it if so.
/// </summary>
/// <param name="chars">A pointer to the string to search for.</param>
/// <param name="count">The length of the string (in chars).</param>
/// <param name="knownHashValue">(optional) If the StringHash has already been calculated, you can provide it here to save re-calculation.</param>
/// <returns>If found in the set, the existing string is returned. If not found, null is returned.</returns>
public unsafe string GetExistingString(char *chars, int count, StringHash knownHashValue = default(StringHash))
{
if (knownHashValue == default(StringHash))
{
knownHashValue = StringHash.GetHash(chars, count);
}
var cursor = GetSearchCursor(knownHashValue);
while (cursor.MightHaveMore)
{
var value = cursor.NextString();
if (value != null && UnsafeStringComparer.AreEqual(value, chars, count))
{
return(value);
}
}
return(null);
}