/indra/llmessage/message_string_table.cpp

/** 
 * @file message_string_table.cpp
 * @brief static string table for message template
 *
 * $LicenseInfo:firstyear=2001&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2010, Linden Research, Inc.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "linden_common.h"

#include "llerror.h"
#include "message.h"

inline U32	message_hash_my_string(const char *str)
{
	U32 retval = 0;
	while (*str++)
	{
		retval += *str;
		retval <<= 1;
	}
	return (retval % MESSAGE_NUMBER_OF_HASH_BUCKETS);
}



LLMessageStringTable::LLMessageStringTable()
:	mUsed(0)
{
	for (U32 i = 0; i < MESSAGE_NUMBER_OF_HASH_BUCKETS; i++)
	{
		mEmpty[i] = TRUE;
		mString[i][0] = 0;
	}
}


LLMessageStringTable::~LLMessageStringTable()
{ }


char* LLMessageStringTable::getString(const char *str)
{
	U32 hash_value = message_hash_my_string(str);
	while (!mEmpty[hash_value])
	{
		if (!strncmp(str, mString[hash_value], MESSAGE_MAX_STRINGS_LENGTH))
		{
			return mString[hash_value];
		}
		else
		{
			hash_value++;
			hash_value %= MESSAGE_NUMBER_OF_HASH_BUCKETS;
		}
	}
	// not found, so add!
	strncpy(mString[hash_value], str, MESSAGE_MAX_STRINGS_LENGTH);	/* Flawfinder: ignore */
	mString[hash_value][MESSAGE_MAX_STRINGS_LENGTH - 1] = 0;
	mEmpty[hash_value] = FALSE;
	mUsed++;
	if (mUsed >= MESSAGE_NUMBER_OF_HASH_BUCKETS - 1)
	{
		U32 i;
		llinfos << "Dumping string table before crashing on HashTable full!" << llendl;
		for (i = 0; i < MESSAGE_NUMBER_OF_HASH_BUCKETS; i++)
		{
			llinfos << "Entry #" << i << ": " << mString[i] << llendl;
		}
	}
	return mString[hash_value];
}