Function BuildFileTable_HetBet

3rdParty/StormLib/src/SBaseFileTable.cpp:2423–2532

#ifdef FULL
static int BuildFileTable_HetBet(TMPQArchive * ha)
{
    TMPQHetTable * pHetTable = ha->pHetTable;
    TMPQBetTable * pBetTable;
    TFileEntry * pFileEntry = ha->pFileTable;
    TBitArray * pBitArray;
    DWORD dwBitPosition = 0;
    DWORD i;
    int nError = ERROR_FILE_CORRUPT;

    // Load the BET table from the MPQ
    pBetTable = LoadBetTable(ha);
    if(pBetTable != NULL)
    {
        // Verify the size of NameHash2 in the BET table.
        // It has to be 8 bits less than the information in HET table
        if((pBetTable->dwBitCount_NameHash2 + 8) != pHetTable->dwNameHashBitSize)
        {
            FreeBetTable(pBetTable);
            return ERROR_FILE_CORRUPT;
        }

        // Step one: Fill the name indexes
        for(i = 0; i < pHetTable->dwTotalCount; i++)
        {
            DWORD dwFileIndex = 0;

            // Is the entry in the HET table occupied?
            if(pHetTable->pNameHashes[i] != HET_ENTRY_FREE)
            {
                // Load the index to the BET table
                GetBits(pHetTable->pBetIndexes, pHetTable->dwIndexSizeTotal * i,
                                                pHetTable->dwIndexSize,
                                               &dwFileIndex,
                                                4);
                // Overflow test
                if(dwFileIndex < pBetTable->dwEntryCount)
                {
                    ULONGLONG NameHash1 = pHetTable->pNameHashes[i];
                    ULONGLONG NameHash2 = 0;

                    // Load the BET hash
                    GetBits(pBetTable->pNameHashes, pBetTable->dwBitTotal_NameHash2 * dwFileIndex,
                                                    pBetTable->dwBitCount_NameHash2,
                                                   &NameHash2,
                                                    8);

                    // Combine both part of the name hash and put it to the file table
                    pFileEntry = ha->pFileTable + dwFileIndex;
                    pFileEntry->FileNameHash = (NameHash1 << pBetTable->dwBitCount_NameHash2) | NameHash2;
                }
            }
        }

        // Go through the entire BET table and convert it to the file table.
        pFileEntry = ha->pFileTable;
        pBitArray = pBetTable->pFileTable;
        for(i = 0; i < pBetTable->dwEntryCount; i++)