mIN_copy_name_str.c

#define NULL 0

extern void* _JW_GetResourceAram(unsigned int aramAddress, unsigned char* outBuffer, int dmaSize);
extern void memcopy(unsigned char* outBuffer, unsigned char* sourceBuffer, int copySize);

void mIN_copy_name_str(unsigned char* outBuffer, unsigned short itemId) {

    struct s_itemNameInfo {
        unsigned short beginingItemId;
        unsigned short endingItemId;
        unsigned short itemNameFileOffset;
    };

    unsigned int itemNameFileAddress = 0x9738E0; // JC_JKRAramArchive_getAramAddress_byName(archivePointer, dataString, itemNamesFileName);
    unsigned int itemNameIndexFileAddress = 0x973860; // JC_JKRAramArchive_getAramAddress_byName(archivePointer, dataString, itemNameIndexFileName);

    unsigned char* nameDMAPointer = (unsigned char*) 0x817F0000;
    struct s_itemNameInfo* indexFilePointer = (struct s_itemNameInfo *) 0x817F0000;
    _JW_GetResourceAram(itemNameIndexFileAddress, (unsigned char*) indexFilePointer, 0x80);

    // Item Id Index Table structure:
    //  0: unsigned short beginItemId
    //  2: unsigned short endItemId
    //  4: unsigned short itemNameFileOffset

    unsigned int itemNameFileOffset;
    struct s_itemNameInfo* itemNameInfo = NULL;

    for (int i = 0; i < 18; i++, indexFilePointer++) {
        if (itemId >= indexFilePointer->beginingItemId && itemId <= indexFilePointer->endingItemId) {
            itemNameInfo = indexFilePointer;
            itemNameFileOffset = indexFilePointer->itemNameFileOffset;
            break;
        }
    }

    if (itemNameInfo == NULL) {
        itemNameFileOffset = 0x9B90;
    }
    else if (itemNameInfo->beginingItemId >= 0x2000 && itemNameInfo->beginingItemId < 0x3000) {
        itemNameFileOffset += (itemId - itemNameInfo->beginingItemId) << 4; // or * 16.
    }
    else { // Must be furniture.
        itemNameFileOffset += ((itemId & ~3) - itemNameInfo->beginingItemId) << 2; // only * 4 here since each item is already in increments of four.
    }

    unsigned int itemNameAramAddress = itemNameFileAddress + itemNameFileOffset;

    // Check to see if the ARAM address is 32-bit aligned. If it isn't, it'll cause a DMA exception, so we must align it.
    unsigned int outBufferAdjust = itemNameAramAddress & 0x1F; // Save the remaining offset.
    itemNameAramAddress &= ~0x1F; // Align it to 32 bits.

    _JW_GetResourceAram(itemNameAramAddress, nameDMAPointer, 0x20); // Copy two item names (16 characters each).
    memcopy(outBuffer, nameDMAPointer + outBufferAdjust, 16); // Copy the DMA'd item name into the original output buffer.
}