GodMode9/source/virtual/vcart.c

#include "vcart.h"
#include "gamecart.h"

#define VFLAG_PRIV_HDR  (1<<31)

static CartData* cdata = (CartData*) VCART_BUFFER; // 128kB reserved (~64kB required)
static bool cart_init = false;

u32 InitVCartDrive(void) {
    cart_init = (InitCardRead(cdata) == 0);
    return cart_init ? cdata->cart_id : 0;
}

bool ReadVCartDir(VirtualFile* vfile, VirtualDir* vdir) {
    if ((vdir->index < 0) && !cart_init)
        InitVCartDrive();
    
    if (++vdir->index < 3) {
        if (!cart_init) return false;
        char name[24];
        GetCartName(name, cdata);
        memset(vfile, 0, sizeof(VirtualFile));
        vfile->keyslot = 0xFF; // unused
        
        if (vdir->index == 2) { // private header
            if (!(cdata->cart_type & CART_CTR)) return false;
            snprintf(vfile->name, 32, "%s-private.bin", name);
            vfile->size = PRIV_HDR_SIZE;
            vfile->flags = VFLAG_PRIV_HDR;
        } else {
            const char* ext = (cdata->cart_type & CART_CTR) ? "3ds" : "nds";
            snprintf(vfile->name, 32, "%s%s.%s", name, (vdir->index == 1) ? ".trim" : "", ext);
            vfile->size = (vdir->index == 1) ? cdata->data_size : cdata->cart_size;
        }
        
        return true;
    }
    
    return false;
}

int ReadVCartFile(const VirtualFile* vfile, u8* buffer, u32 offset, u32 count) {
    if (vfile->flags & VFLAG_PRIV_HDR)
        return ReadCartPrivateHeader(buffer, offset, count, cdata);
    else return ReadCartBytes(buffer, offset, count, cdata);
}

u64 GetVCartDriveSize(void) {
    return cart_init ? cdata->cart_size : 0;
}