mirror of
https://github.com/d0k3/GodMode9.git
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fa741b265b
Why does this work? We are writing flash memories without erasing them, and writing pages without regard to alignment. Yet it works?
109 lines
4.1 KiB
C
109 lines
4.1 KiB
C
#include "vcart.h"
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#include "gamecart.h"
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#define FAT_LIMIT 0x100000000
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#define VFLAG_JEDECID_AND_SRFG (1UL<<29)
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#define VFLAG_SAVEGAME (1UL<<30)
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#define VFLAG_PRIV_HDR (1UL<<31)
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static CartData* cdata = NULL;
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static bool cart_init = false;
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static bool cart_checked = false;
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u32 InitVCartDrive(void) {
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if (!cart_checked) cart_checked = true;
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if (!cdata) cdata = (CartData*) malloc(sizeof(CartData));
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cart_init = (cdata && (InitCartRead(cdata) == 0) && (cdata->cart_size <= FAT_LIMIT));
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if (!cart_init && cdata) {
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free(cdata);
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cdata = NULL;
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}
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return cart_init ? cdata->cart_id : 0;
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}
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bool ReadVCartDir(VirtualFile* vfile, VirtualDir* vdir) {
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if ((vdir->index < 0) && !cart_init)
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InitVCartDrive();
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if (!cart_init) return false;
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const char* ext = (cdata->cart_type & CART_CTR) ? "3ds" : "nds";
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char name[24];
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GetCartName(name, cdata);
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memset(vfile, 0, sizeof(VirtualFile));
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vfile->keyslot = 0xFF; // unused
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vfile->flags = VFLAG_READONLY;
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while (++vdir->index <= 7) {
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if ((vdir->index == 0) && (cdata->data_size < FAT_LIMIT)) { // standard full rom
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snprintf(vfile->name, 32, "%s.%s", name, ext);
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vfile->size = cdata->cart_size;
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if (vfile->size == FAT_LIMIT) vfile->size--;
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return true;
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} else if ((vdir->index == 1) && (cdata->data_size < FAT_LIMIT) && cdata->data_size) { // trimmed rom
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snprintf(vfile->name, 32, "%s.trim.%s", name, ext);
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vfile->size = cdata->data_size;
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return true;
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} else if ((vdir->index == 3) && (cdata->cart_size == FAT_LIMIT)) { // split rom .000
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snprintf(vfile->name, 32, "%s.split.000", name);
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vfile->size = (FAT_LIMIT / 2);
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return true;
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} else if ((vdir->index == 4) && (cdata->cart_size == FAT_LIMIT)) { // split rom .001
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snprintf(vfile->name, 32, "%s.split.001", name);
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vfile->size = (FAT_LIMIT / 2);
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vfile->offset = (FAT_LIMIT / 2);
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return true;
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} else if ((vdir->index == 5) && (cdata->cart_type & CART_CTR)) { // private header
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snprintf(vfile->name, 32, "%s-priv.bin", name);
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vfile->size = PRIV_HDR_SIZE;
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vfile->flags |= VFLAG_PRIV_HDR;
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return true;
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} else if ((vdir->index == 6) && (cdata->save_size > 0)) { // savegame
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snprintf(vfile->name, 32, "%s.sav", name);
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vfile->size = cdata->save_size;
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vfile->flags = VFLAG_SAVEGAME;
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return true;
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} else if (vdir->index == 7) { // JEDEC id and status register
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strcpy(vfile->name, "jedecid_and_sreg.bin");
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vfile->size = JEDECID_AND_SREG_SIZE;
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vfile->flags |= VFLAG_JEDECID_AND_SRFG;
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return true;
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}
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}
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return false;
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}
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int ReadVCartFile(const VirtualFile* vfile, void* buffer, u64 offset, u64 count) {
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u32 foffset = vfile->offset + offset;
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if (!cdata) return -1;
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if (vfile->flags & VFLAG_PRIV_HDR)
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return ReadCartPrivateHeader(buffer, foffset, count, cdata);
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else if (vfile->flags & VFLAG_SAVEGAME)
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return ReadCartSave(buffer, foffset, count, cdata);
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else if (vfile->flags & VFLAG_JEDECID_AND_SRFG)
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return ReadCartSaveJedecId(buffer, foffset, count, cdata);
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else return ReadCartBytes(buffer, foffset, count, cdata);
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}
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int WriteVCartFile(const VirtualFile* vfile, const void* buffer, u64 offset, u64 count) {
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if (!cdata) return -1;
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if (vfile->flags & VFLAG_SAVEGAME) {
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return WriteCartSave(buffer, offset, count, cdata);
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}
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return -1;
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}
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u64 GetVCartDriveSize(void) {
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return cart_init ? cdata->cart_size : 0;
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}
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void GetVCartTypeString(char* typestr) {
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// typestr needs to be at least 11 + 1 chars big
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if (!cart_init || !cdata) sprintf(typestr, cart_checked ? "EMPTY" : "INIT");
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else sprintf(typestr, "%s%08lX",
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(cdata->cart_type & CART_CTR) ? "CTR" :
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(cdata->cart_type & CART_TWL) ? "TWL" :
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(cdata->cart_type & CART_NTR) ? "NTR" : "???",
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cdata->cart_id);
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}
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