message_string_table.cpp

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#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 gMessageStringTable;


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];
}

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