BH - ItemData->prefix/suffix lookup

[calm cedar]

D2Structs.h

struct ItemData {
    ...
    WORD wRarePrefix;                //0x32
    WORD wRareSuffix;                //0x34
    WORD wAutoPrefix;                //0x36
    WORD wPrefix[3];                //0x38
    WORD wSuffix[3];                //0x3E
    ...
};

It's used here for instance:

item/ItemDisplay.cpp

line 2903: if ((itemData->wPrefix[0] - PREFIX_OFFSET > 0) ? IntegerCompare(itemData->wPrefix[0] - PREFIX_OFFSET, operation, prefixID1, prefixID2) : false)

The PREFIX_OFFSET is initialised here:

item/Item.cpp

line 637
void GetAffixOffsets()
 {
     D2MagicAffixDataTbl* pMagicAffixInfo = D2COMMON_10492_DATATBLS_GetMagicAffixDataTables();
     PREFIX_OFFSET = ((int)pMagicAffixInfo->pMagicPrefix - (int)pMagicAffixInfo->pMagicAffixTxt) / sizeof(AutoMagicTxt);
     AUTOMOD_OFFSET = ((int)pMagicAffixInfo->pAutoMagic - (int)pMagicAffixInfo->pMagicAffixTxt) / sizeof(AutoMagicTxt);
 }

D2DataTables.h

struct D2MagicAffixDataTbl                        //sgptDataTable + 0xEC8
{
    int nMagicAffixTxtRecordCount;                //0x00
    AutoMagicTxt* pMagicAffixTxt;                //0x04
    AutoMagicTxt* pMagicSuffix;                    //0x08
    AutoMagicTxt* pMagicPrefix;                    //0x0C
    AutoMagicTxt* pAutoMagic;                    //0x10
};

[elder heron]

D2COMMON_10492_DATATBLS_GetMagicAffixDataTables is from FUNCPTR(D2COMMON, 10492_DATATBLS_GetMagicAffixDataTables, D2MagicAffixDataTbl* __stdcall, (), -10492); in D2Ptrs.h:353, these are static locations reverse engineered from the game dlls

https://github.com/ThePhrozenKeep/D2MOO/blob/master/source/D2Common/include/DataTbls/ItemsTbls.h#L545 for the structure info in 1.10f

if you want to see the affix tables in human readable form you need to extract MagicPrefix.txt and MagicSuffix.txt in pd2data.mpq using an mpq editor/extractor