remove subdirectories

1 files changed, 929 insertions, 0 deletions

diff --git a/src/save.c b/src/save.c
new file mode 100644
index 000000000..0b7a3dd79
--- /dev/null
+++ b/src/save.c
@@ -0,0 +1,929 @@
+#include "global.h"
+#include "gba/gba.h"
+#include "gba/flash_internal.h"
+#include "save.h"
+#include "load_save.h"
+#include "overworld.h"
+#include "pokemon.h"
+#include "save_failed_screen.h"
+#include "ewram.h"
+
+#define FILE_SIGNATURE 0x08012025  // signature value to determine if a sector is in use
+
+//#define TOTAL_FLASH_SECTORS ((ARRAY_COUNT(sSaveBlockChunks) * 2) + (ARRAY_COUNT(sHallOfFameChunks) * 2)) // there are 2 slots, so double each array count and get the sum.
+#define TOTAL_FLASH_SECTORS 32
+
+struct SaveBlockChunk
+{
+    u8 *data;
+    u16 size;
+};
+
+struct SaveSector
+{
+    u8 data[0xFF4];
+    u16 id;
+    u16 checksum;
+    u32 signature;
+    u32 counter;
+}; // size is 0x1000
+
+// headless save section?
+struct UnkSaveSection
+{
+    u8 data[0xFF4];
+    u32 signature;
+}; // size is 0xFF8
+
+static u8 WriteSingleChunk(u16, const struct SaveBlockChunk *);
+static u8 HandleWriteSectorNBytes(u8 sector, u8 *data, u16 size);
+static u8 TryWriteSector(u8, u8 *);
+static u32 RestoreSaveBackupVarsAndIncrement(const struct SaveBlockChunk *location);
+static u32 RestoreSaveBackupVars(const struct SaveBlockChunk *location);
+static u8 sub_812550C(u16 a1, const struct SaveBlockChunk *location);
+static u8 sub_812556C(u16 a1, const struct SaveBlockChunk *location);
+static u8 sub_81255B8(u16, const struct SaveBlockChunk *location);
+static u8 WriteSomeFlashByteToPrevSector(u16 a1, const struct SaveBlockChunk *location);
+static u8 WriteSomeFlashByte0x25ToPrevSector(u16 a1, const struct SaveBlockChunk *location);
+static u8 sub_812587C(u16 a1, const struct SaveBlockChunk *location);
+static u8 sub_81258BC(u16, const struct SaveBlockChunk *location);
+static u8 GetSaveValidStatus(const struct SaveBlockChunk *location);
+static u8 ReadSomeUnknownSectorAndVerify(u8 a1, u8 *data, u16 size);
+static u8 DoReadFlashWholeSection(u8, struct SaveSector *);
+static u16 CalculateChecksum(void *, u16);
+bool8 unref_sub_8125F4C(struct UnkSaveSection *a1);
+u8 unref_sub_8125FA0(void);
+u8 unref_sub_8125FF0(u8 *data, u16 size);
+u8 unref_sub_8126068(u8 sector, u8 *data, u32 size);
+u8 unref_sub_8126080(u8 sector, u8 *data);
+
+// Sector num to begin writing save data. Sectors are rotated each time the game is saved. (possibly to avoid wear on flash memory?)
+u16 gFirstSaveSector;
+u32 gPrevSaveCounter;
+u16 gLastKnownGoodSector;
+u32 gDamagedSaveSectors;
+u32 gSaveCounter;
+struct SaveSector *gFastSaveSection; // the pointer is in fast IWRAM but may sometimes point to the slower EWRAM.
+u16 gUnknown_03005EB4;
+u16 gSaveFileStatus;
+u32 gGameContinueCallback;
+
+static EWRAM_DATA u32 gLastSaveSectorStatus = 0; // used but in an unferenced function, so unused
+
+// Each 4 KiB flash sector contains 3968 bytes of actual data followed by a 128 byte footer
+#define SECTOR_DATA_SIZE 3968
+#define SECTOR_FOOTER_SIZE 128
+
+/*
+ * Sector Layout:
+ * 
+ * Sectors 0 - 13:      Save Slot 1
+ * Sectors 14 - 27:     Save Slot 2
+ * Sectors 28 - 29:     Hall of Fame
+ * Sectors 30 - 31:     e-Reader battle tower data, maybe?
+ * 
+ * There are two save slots for saving the player's game data. We alternate between
+ * them each time the game is saved, so that if the current save slot is corrupt,
+ * we can load the previous one. We also rotate the sectors in each save slot
+ * so that the same data is not always being written to the same sector. This
+ * might be done to reduce wear on the flash memory, but I'm not sure, since all
+ * 14 sectors get written anyway.
+ */
+
+#define HALL_OF_FAME_SECTOR 28
+
+#define NUM_SECTORS_PER_SAVE_SLOT 14  // Number of sectors occupied by a save slot
+#define NUM_HALL_OF_FAME_SECTORS 2
+
+// Divide save blocks into individual chunks to be written to flash sectors
+
+#define SAVEBLOCK_CHUNK(structure, chunkNum)                                \
+{                                                                           \
+    (u8 *)&structure + chunkNum * SECTOR_DATA_SIZE,                         \
+    min(sizeof(structure) - chunkNum * SECTOR_DATA_SIZE, SECTOR_DATA_SIZE)  \
+}                                                                           \
+
+static const struct SaveBlockChunk sSaveBlockChunks[] =
+{
+    SAVEBLOCK_CHUNK(gSaveBlock2, 0),
+
+    SAVEBLOCK_CHUNK(gSaveBlock1, 0),
+    SAVEBLOCK_CHUNK(gSaveBlock1, 1),
+    SAVEBLOCK_CHUNK(gSaveBlock1, 2),
+    SAVEBLOCK_CHUNK(gSaveBlock1, 3),
+
+    SAVEBLOCK_CHUNK(gPokemonStorage, 0),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 1),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 2),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 3),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 4),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 5),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 6),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 7),
+    SAVEBLOCK_CHUNK(gPokemonStorage, 8),
+};
+
+static const struct SaveBlockChunk sHallOfFameChunks[] =
+{
+    SAVEBLOCK_CHUNK(*eHallOfFame, 0),
+    SAVEBLOCK_CHUNK(*eHallOfFame, 1),
+};
+
+void Save_EraseAllData(void)
+{
+    u16 i;
+
+    for (i = 0; i < NUM_SECTORS; i++)
+        EraseFlashSector(i);
+}
+
+void Save_ResetSaveCounters(void)
+{
+    gSaveCounter = 0;
+    gFirstSaveSector = 0;
+    gDamagedSaveSectors = 0;
+}
+
+enum
+{
+    SECTOR_DAMAGED,
+    SECTOR_OK,
+    SECTOR_CHECK, // unused
+};
+
+static bool32 SetSectorDamagedStatus(u8 op, u8 sectorNum)
+{
+    bool32 retVal = FALSE;
+
+    switch (op)
+    {
+    case SECTOR_DAMAGED:
+        gDamagedSaveSectors |= (1 << sectorNum);
+        break;
+    case SECTOR_OK:
+        gDamagedSaveSectors &= ~(1 << sectorNum);
+        break;
+    case SECTOR_CHECK: // unused
+        if (gDamagedSaveSectors & (1 << sectorNum))
+            retVal = TRUE;
+        break;
+    }
+
+    return retVal;
+}
+
+// If chunkId is 0xFFFF, this function will write all of the chunks pointed to by 'chunks'.
+// Otherwise, it will write a single chunk with the given 'chunkId'.
+static u8 WriteSaveBlockChunks(u16 chunkId, const struct SaveBlockChunk *chunks)
+{
+    u32 retVal;
+    u16 i;
+
+    gFastSaveSection = eSaveSection;
+
+    if (chunkId != 0xFFFF)  // write single chunk
+    {
+        retVal = WriteSingleChunk(chunkId, chunks);
+    }
+    else  // write all chunks
+    {
+        gLastKnownGoodSector = gFirstSaveSector;
+        gPrevSaveCounter = gSaveCounter;
+        gFirstSaveSector++;
+        gFirstSaveSector %= NUM_SECTORS_PER_SAVE_SLOT;
+        gSaveCounter++;
+        retVal = SAVE_STATUS_OK;
+
+        for (i = 0; i < NUM_SECTORS_PER_SAVE_SLOT; i++)
+            WriteSingleChunk(i, chunks);
+
+        // Check for any bad sectors
+        if (gDamagedSaveSectors != 0) // skip the damaged sector.
+        {
+            retVal = SAVE_STATUS_ERROR;
+            gFirstSaveSector = gLastKnownGoodSector;
+            gSaveCounter = gPrevSaveCounter;
+        }
+    }
+
+    return retVal;
+}
+
+static u8 WriteSingleChunk(u16 chunkId, const struct SaveBlockChunk *chunks)
+{
+    u16 i;
+    u16 sectorNum;
+    u8 *chunkData;
+    u16 chunkSize;
+
+    // select sector number
+    sectorNum = chunkId + gFirstSaveSector;
+    sectorNum %= NUM_SECTORS_PER_SAVE_SLOT;
+    // select save slot
+    sectorNum += NUM_SECTORS_PER_SAVE_SLOT * (gSaveCounter % 2);
+
+    chunkData = chunks[chunkId].data;
+    chunkSize = chunks[chunkId].size;
+
+    // clear save section.
+    for (i = 0; i < sizeof(struct SaveSector); i++)
+        ((u8 *)gFastSaveSection)[i] = 0;
+
+    gFastSaveSection->id = chunkId;
+    gFastSaveSection->signature = FILE_SIGNATURE;
+    gFastSaveSection->counter = gSaveCounter;
+    for (i = 0; i < chunkSize; i++)
+        gFastSaveSection->data[i] = chunkData[i];
+    gFastSaveSection->checksum = CalculateChecksum(chunkData, chunkSize);
+
+    return TryWriteSector(sectorNum, gFastSaveSection->data);
+}
+
+static u8 HandleWriteSectorNBytes(u8 sectorNum, u8 *data, u16 size)
+{
+    u16 i;
+    struct SaveSector *section = eSaveSection;
+
+    for (i = 0; i < sizeof(struct SaveSector); i++)
+        ((char *)section)[i] = 0;
+
+    section->signature = FILE_SIGNATURE;
+    for (i = 0; i < size; i++)
+        section->data[i] = data[i];
+    section->id = CalculateChecksum(data, size); // though this appears to be incorrect, it might be some sector checksum instead of a whole save checksum and only appears to be relevent to HOF data, if used.
+
+    return TryWriteSector(sectorNum, section->data);
+}
+
+static u8 TryWriteSector(u8 sectorNum, u8 *data)
+{
+    if (ProgramFlashSectorAndVerify(sectorNum, data) != 0) // is damaged?
+    {
+        SetSectorDamagedStatus(SECTOR_DAMAGED, sectorNum); // set damaged sector bits.
+        return SAVE_STATUS_ERROR;
+    }
+    else
+    {
+        SetSectorDamagedStatus(SECTOR_OK, sectorNum); // unset damaged sector bits. it's safe now.
+        return SAVE_STATUS_OK;
+    }
+}
+
+static u32 RestoreSaveBackupVarsAndIncrement(const struct SaveBlockChunk *chunk) // chunk is unused
+{
+    gFastSaveSection = eSaveSection;
+    gLastKnownGoodSector = gFirstSaveSector;
+    gPrevSaveCounter = gSaveCounter;
+    gFirstSaveSector++;
+    gFirstSaveSector %= NUM_SECTORS_PER_SAVE_SLOT;
+    gSaveCounter++;
+    gUnknown_03005EB4 = 0;
+    gDamagedSaveSectors = 0;
+    return 0;
+}
+
+static u32 RestoreSaveBackupVars(const struct SaveBlockChunk *chunk) // chunk is unused
+{
+    gFastSaveSection = eSaveSection;
+    gLastKnownGoodSector = gFirstSaveSector;
+    gPrevSaveCounter = gSaveCounter;
+    gUnknown_03005EB4 = 0;
+    gDamagedSaveSectors = 0;
+    return 0;
+}
+
+static u8 sub_812550C(u16 a1, const struct SaveBlockChunk *chunk)
+{
+    u8 retVal;
+
+    if (gUnknown_03005EB4 < a1 - 1)
+    {
+        retVal = SAVE_STATUS_OK;
+        WriteSingleChunk(gUnknown_03005EB4, chunk);
+        gUnknown_03005EB4++;
+        if (gDamagedSaveSectors)
+        {
+            retVal = SAVE_STATUS_ERROR;
+            gFirstSaveSector = gLastKnownGoodSector;
+            gSaveCounter = gPrevSaveCounter;
+        }
+    }
+    else
+    {
+        retVal = SAVE_STATUS_ERROR;
+    }
+
+    return retVal;
+}
+
+static u8 sub_812556C(u16 a1, const struct SaveBlockChunk *chunk)
+{
+    u8 retVal = SAVE_STATUS_OK;
+
+    sub_81255B8(a1 - 1, chunk);
+
+    if (gDamagedSaveSectors)
+    {
+        retVal = SAVE_STATUS_ERROR;
+        gFirstSaveSector = gLastKnownGoodSector;
+        gSaveCounter = gPrevSaveCounter;
+    }
+    return retVal;
+}
+
+static u8 sub_81255B8(u16 chunkId, const struct SaveBlockChunk *chunks)
+{
+    u16 i;
+    u16 sector;
+    u8 *data;
+    u16 size;
+    u8 status;
+
+    // select sector number
+    sector = chunkId + gFirstSaveSector;
+    sector %= NUM_SECTORS_PER_SAVE_SLOT;
+    // select save slot
+    sector += NUM_SECTORS_PER_SAVE_SLOT * (gSaveCounter % 2);
+
+    data = chunks[chunkId].data;
+    size = chunks[chunkId].size;
+
+    // clear temp save section.
+    for (i = 0; i < sizeof(struct SaveSector); i++)
+        ((char *)gFastSaveSection)[i] = 0;
+
+    gFastSaveSection->id = chunkId;
+    gFastSaveSection->signature = FILE_SIGNATURE;
+    gFastSaveSection->counter = gSaveCounter;
+
+    // set temp section's data.
+    for (i = 0; i < size; i++)
+        gFastSaveSection->data[i] = data[i];
+
+    // calculate checksum.
+    gFastSaveSection->checksum = CalculateChecksum(data, size);
+
+    EraseFlashSector(sector);
+
+    status = SAVE_STATUS_OK;
+
+    for (i = 0; i < sizeof(struct UnkSaveSection); i++)
+    {
+        if (ProgramFlashByte(sector, i, gFastSaveSection->data[i]))
+        {
+            status = SAVE_STATUS_ERROR;
+            break;
+        }
+    }
+
+    if (status == SAVE_STATUS_ERROR)
+    {
+        SetSectorDamagedStatus(SECTOR_DAMAGED, sector);
+        return SAVE_STATUS_ERROR;
+    }
+    else
+    {
+        status = SAVE_STATUS_OK;
+
+        for (i = 0; i < 7; i++)
+        {
+            if (ProgramFlashByte(sector, 0xFF9 + i, ((u8 *)gFastSaveSection)[0xFF9 + i]))
+            {
+                status = SAVE_STATUS_ERROR;
+                break;
+            }
+        }
+
+        if (status == SAVE_STATUS_ERROR)
+        {
+            SetSectorDamagedStatus(SECTOR_DAMAGED, sector);
+            return SAVE_STATUS_ERROR;
+        }
+        else
+        {
+            SetSectorDamagedStatus(SECTOR_OK, sector);
+            return SAVE_STATUS_OK;
+        }
+    }
+}
+
+static u8 WriteSomeFlashByteToPrevSector(u16 a1, const struct SaveBlockChunk *chunk)
+{
+    u16 sector;
+
+    // select sector number
+    sector = a1 + gFirstSaveSector - 1;
+    sector %= NUM_SECTORS_PER_SAVE_SLOT;
+    // select save slot
+    sector += NUM_SECTORS_PER_SAVE_SLOT * (gSaveCounter % 2);
+
+    if (ProgramFlashByte(sector, sizeof(struct UnkSaveSection), ((u8 *)gFastSaveSection)[sizeof(struct UnkSaveSection)]))
+    {
+        // sector is damaged, so enable the bit in gDamagedSaveSectors and restore the last written sector and save counter.
+        SetSectorDamagedStatus(SECTOR_DAMAGED, sector);
+        gFirstSaveSector = gLastKnownGoodSector;
+        gSaveCounter = gPrevSaveCounter;
+        return SAVE_STATUS_ERROR;
+    }
+    else
+    {
+        SetSectorDamagedStatus(SECTOR_OK, sector);
+        return SAVE_STATUS_OK;
+    }
+}
+
+static u8 WriteSomeFlashByte0x25ToPrevSector(u16 a1, const struct SaveBlockChunk *chunk)
+{
+    u16 sector;
+
+    sector = a1 + gFirstSaveSector - 1;
+    sector %= NUM_SECTORS_PER_SAVE_SLOT;
+    sector += NUM_SECTORS_PER_SAVE_SLOT * (gSaveCounter % 2);
+
+    if (ProgramFlashByte(sector, sizeof(struct UnkSaveSection), 0x25))
+    {
+        // sector is damaged, so enable the bit in gDamagedSaveSectors and restore the last written sector and save counter.
+        SetSectorDamagedStatus(SECTOR_DAMAGED, sector);
+        gFirstSaveSector = gLastKnownGoodSector;
+        gSaveCounter = gPrevSaveCounter;
+        return SAVE_STATUS_ERROR;
+    }
+    else
+    {
+        SetSectorDamagedStatus(SECTOR_OK, sector);
+        return SAVE_STATUS_OK;
+    }
+}
+
+static u8 sub_812587C(u16 a1, const struct SaveBlockChunk *chunk)
+{
+    u8 retVal;
+    gFastSaveSection = eSaveSection;
+    if (a1 != 0xFFFF)
+    {
+        retVal = SAVE_STATUS_ERROR;
+    }
+    else
+    {
+        retVal = GetSaveValidStatus(chunk);
+        sub_81258BC(0xFFFF, chunk);
+    }
+
+    return retVal;
+}
+
+static u8 sub_81258BC(u16 a1, const struct SaveBlockChunk *chunks)
+{
+    u16 i;
+    u16 checksum;
+    u16 sector = NUM_SECTORS_PER_SAVE_SLOT * (gSaveCounter % 2);
+    u16 id;
+
+    for (i = 0; i < NUM_SECTORS_PER_SAVE_SLOT; i++)
+    {
+        DoReadFlashWholeSection(i + sector, gFastSaveSection);
+        id = gFastSaveSection->id;
+        if (id == 0)
+            gFirstSaveSector = i;
+        checksum = CalculateChecksum(gFastSaveSection->data, chunks[id].size);
+        if (gFastSaveSection->signature == FILE_SIGNATURE
+         && gFastSaveSection->checksum == checksum)
+        {
+            u16 j;
+            for (j = 0; j < chunks[id].size; j++)
+                chunks[id].data[j] = gFastSaveSection->data[j];
+        }
+    }
+
+    return 1;
+}
+
+static u8 GetSaveValidStatus(const struct SaveBlockChunk *chunks)
+{
+    u16 sector;
+    bool8 signatureValid;
+    u16 checksum;
+    u32 slot1saveCounter = 0;
+    u32 slot2saveCounter = 0;
+    u8 slot1Status;
+    u8 slot2Status;
+    u32 validSectors;
+    const u32 ALL_SECTORS = (1 << NUM_SECTORS_PER_SAVE_SLOT) - 1;  // bitmask of all saveblock sectors
+
+    // check save slot 1.
+    validSectors = 0;
+    signatureValid = FALSE;
+    for (sector = 0; sector < NUM_SECTORS_PER_SAVE_SLOT; sector++)
+    {
+        DoReadFlashWholeSection(sector, gFastSaveSection);
+        if (gFastSaveSection->signature == FILE_SIGNATURE)
+        {
+            signatureValid = TRUE;
+            checksum = CalculateChecksum(gFastSaveSection->data, chunks[gFastSaveSection->id].size);
+            if (gFastSaveSection->checksum == checksum)
+            {
+                slot1saveCounter = gFastSaveSection->counter;
+                validSectors |= 1 << gFastSaveSection->id;
+            }
+        }
+    }
+
+    if (signatureValid)
+    {
+        if (validSectors == ALL_SECTORS)
+            slot1Status = SAVE_STATUS_OK;
+        else
+            slot1Status = SAVE_STATUS_ERROR;
+    }
+    else
+    {
+        slot1Status = SAVE_STATUS_EMPTY;
+    }
+
+    // check save slot 2.
+    validSectors = 0;
+    signatureValid = FALSE;
+    for (sector = 0; sector < NUM_SECTORS_PER_SAVE_SLOT; sector++)
+    {
+        DoReadFlashWholeSection(NUM_SECTORS_PER_SAVE_SLOT + sector, gFastSaveSection);
+        if (gFastSaveSection->signature == FILE_SIGNATURE)
+        {
+            signatureValid = TRUE;
+            checksum = CalculateChecksum(gFastSaveSection->data, chunks[gFastSaveSection->id].size);
+            if (gFastSaveSection->checksum == checksum)
+            {
+                slot2saveCounter = gFastSaveSection->counter;
+                validSectors |= 1 << gFastSaveSection->id;
+            }
+        }
+    }
+
+    if (signatureValid)
+    {
+        if (validSectors == ALL_SECTORS)
+            slot2Status = SAVE_STATUS_OK;
+        else
+            slot2Status = SAVE_STATUS_ERROR;
+    }
+    else
+    {
+        slot2Status = SAVE_STATUS_EMPTY;
+    }
+
+    if (slot1Status == SAVE_STATUS_OK && slot2Status == SAVE_STATUS_OK)
+    {
+        // Choose counter of the most recent save file
+        if ((slot1saveCounter == -1 && slot2saveCounter == 0) || (slot1saveCounter == 0 && slot2saveCounter == -1))
+        {
+            if ((unsigned)(slot1saveCounter + 1) < (unsigned)(slot2saveCounter + 1))
+                gSaveCounter = slot2saveCounter;
+            else
+                gSaveCounter = slot1saveCounter;
+        }
+        else
+        {
+            if (slot1saveCounter < slot2saveCounter)
+                gSaveCounter = slot2saveCounter;
+            else
+                gSaveCounter = slot1saveCounter;
+        }
+        return SAVE_STATUS_OK;
+    }
+
+    if (slot1Status == SAVE_STATUS_OK)
+    {
+        gSaveCounter = slot1saveCounter;
+        if (slot2Status == SAVE_STATUS_ERROR)
+            return SAVE_STATUS_ERROR;
+        else
+            return SAVE_STATUS_OK;
+    }
+
+    if (slot2Status == SAVE_STATUS_OK)
+    {
+        gSaveCounter = slot2saveCounter;
+        if (slot1Status == SAVE_STATUS_ERROR)
+            return SAVE_STATUS_ERROR;
+        else
+            return SAVE_STATUS_OK;
+    }
+
+    if (slot1Status == SAVE_STATUS_EMPTY && slot2Status == SAVE_STATUS_EMPTY)
+    {
+        gSaveCounter = 0;
+        gFirstSaveSector = 0;
+        return SAVE_STATUS_EMPTY;
+    }
+
+    gSaveCounter = 0;
+    gFirstSaveSector = 0;
+    return 2;
+}
+
+static u8 ReadSomeUnknownSectorAndVerify(u8 sector, u8 *data, u16 size)
+{
+    u16 i;
+    struct SaveSector *section = eSaveSection;
+
+    DoReadFlashWholeSection(sector, section);
+    if (section->signature == FILE_SIGNATURE)
+    {
+        u16 checksum = CalculateChecksum(section->data, size);
+        if (section->id == checksum)
+        {
+            for (i = 0; i < size; i++)
+                data[i] = section->data[i];
+            return SAVE_STATUS_OK;
+        }
+        else
+        {
+            return 2;
+        }
+    }
+    else
+    {
+        return SAVE_STATUS_EMPTY;
+    }
+}
+
+static u8 DoReadFlashWholeSection(u8 sector, struct SaveSector *section)
+{
+    ReadFlash(sector, 0, section->data, sizeof(struct SaveSector));
+    return 1;
+}
+
+static u16 CalculateChecksum(void *data, u16 size)
+{
+    u16 i;
+    u32 checksum = 0;
+
+    for (i = 0; i < (size / 4); i++)
+        checksum += *((u32 *)data)++;
+
+    return ((checksum >> 16) + checksum);
+}
+
+#if DEBUG
+void sub_813B79C(void)
+{
+    struct SaveSector *sbSector;
+    struct SaveSector *hofSector;
+    const struct SaveBlockChunk *sbChunks;
+    const struct SaveBlockChunk *hofChunks;
+    u16 i;
+
+    sbSector = eSaveSection;
+    sbChunks = sSaveBlockChunks;
+    for (i = 0; i < NUM_SECTORS_PER_SAVE_SLOT * 2; i++)
+    {
+        DoReadFlashWholeSection(i, sbSector);
+        sbSector->checksum = CalculateChecksum(sbSector, sbChunks[sbSector->id].size);
+        ProgramFlashSectorAndVerify(i, sbSector->data);
+    }
+
+    hofSector = eSaveSection;
+    hofChunks = sHallOfFameChunks;
+    for (i = 0; i < NUM_HALL_OF_FAME_SECTORS; i++)
+    {
+        DoReadFlashWholeSection(HALL_OF_FAME_SECTOR + i, hofSector);
+        hofSector->id = CalculateChecksum(hofSector, hofChunks[i].size);  // why id?
+        ProgramFlashSectorAndVerify(HALL_OF_FAME_SECTOR + i, hofSector->data);
+    }
+}
+#endif
+
+u8 Save_WriteDataInternal(u8 saveType)
+{
+    u8 i;
+
+    switch (saveType)
+    {
+    case SAVE_HALL_OF_FAME_ERASE_BEFORE: // wipes all hall of fame data, then saves hall of fame. unused
+        for (i = HALL_OF_FAME_SECTOR; i < TOTAL_FLASH_SECTORS; i++)
+            EraseFlashSector(i);
+        // fall through
+    case SAVE_HALL_OF_FAME: // hall of fame.
+        if (GetGameStat(GAME_STAT_ENTERED_HOF) < 999)
+            IncrementGameStat(GAME_STAT_ENTERED_HOF);
+        for (i = 0; i < NUM_HALL_OF_FAME_SECTORS; i++)
+            HandleWriteSectorNBytes(HALL_OF_FAME_SECTOR + i, sHallOfFameChunks[i].data, sHallOfFameChunks[i].size);
+        SaveSerializedGame();
+        WriteSaveBlockChunks(0xFFFF, sSaveBlockChunks);
+        break;
+    case SAVE_NORMAL: // normal save. also called by overwriting your own save.
+    default:
+        SaveSerializedGame();
+        WriteSaveBlockChunks(0xFFFF, sSaveBlockChunks);
+        break;
+    case SAVE_LINK: // link save. updates only gSaveBlock1 and gSaveBlock2.
+        SaveSerializedGame();
+        for (i = 0; i < 5; i++)
+            WriteSaveBlockChunks(i, sSaveBlockChunks);
+        break;
+    case SAVE_EREADER: // used in mossdeep "game corner" before/after battling old man e-reader trainer
+        SaveSerializedGame();
+        WriteSaveBlockChunks(0, sSaveBlockChunks);
+        break;
+    case SAVE_OVERWRITE_DIFFERENT_FILE: // there is a different file, so overwrite it completely.
+        // Erase Hall of Fame.
+        for (i = HALL_OF_FAME_SECTOR; i < TOTAL_FLASH_SECTORS; i++)
+            EraseFlashSector(i);
+        SaveSerializedGame();
+        WriteSaveBlockChunks(0xFFFF, sSaveBlockChunks);
+        break;
+    }
+    return 0;
+}
+
+#if DEBUG
+extern u32 gUnknown_Debug_03004BD0;
+#endif
+
+u8 Save_WriteData(u8 saveType) // TrySave
+{
+    if (gFlashMemoryPresent != TRUE)
+        return SAVE_STATUS_ERROR;
+
+    Save_WriteDataInternal(saveType);
+    if (!gDamagedSaveSectors
+#if DEBUG
+        && gUnknown_Debug_03004BD0 == 0
+#endif
+        )
+        return SAVE_STATUS_OK;
+
+    DoSaveFailedScreen(saveType);
+    return SAVE_STATUS_ERROR;
+}
+
+u8 sub_8125D80(void) // trade.s save
+{
+    if (gFlashMemoryPresent != TRUE)
+        return 1;
+    SaveSerializedGame();
+    RestoreSaveBackupVarsAndIncrement(sSaveBlockChunks);
+    return 0;
+}
+
+bool8 sub_8125DA8(void) // trade.s save
+{
+    u8 retVal = sub_812550C(ARRAY_COUNT(sSaveBlockChunks), sSaveBlockChunks);
+    if (gDamagedSaveSectors)
+        DoSaveFailedScreen(0);
+    if (retVal == SAVE_STATUS_ERROR)
+        return 1;
+    else
+        return 0;
+}
+
+u8 sub_8125DDC(void) // trade.s save
+{
+    sub_812556C(ARRAY_COUNT(sSaveBlockChunks), sSaveBlockChunks);
+    if (gDamagedSaveSectors)
+        DoSaveFailedScreen(0);
+    return 0;
+}
+
+u8 sub_8125E04(void) // trade.s save
+{
+    WriteSomeFlashByteToPrevSector(ARRAY_COUNT(sSaveBlockChunks), sSaveBlockChunks);
+    if (gDamagedSaveSectors)
+        DoSaveFailedScreen(0);
+    return 0;
+}
+
+u8 sub_8125E2C(void)
+{
+    if (gFlashMemoryPresent != TRUE)
+        return 1;
+
+    SaveSerializedGame();
+    RestoreSaveBackupVars(sSaveBlockChunks);
+    sub_812556C(gUnknown_03005EB4 + 1, sSaveBlockChunks);
+    return 0;
+}
+
+// something to do with multiplayer. Possibly record mizing?
+bool8 sub_8125E6C(void)
+{
+    u8 retVal = FALSE;
+    u16 val = ++gUnknown_03005EB4;
+    if (val <= 4)
+    {
+        sub_812556C(gUnknown_03005EB4 + 1, sSaveBlockChunks);
+        WriteSomeFlashByte0x25ToPrevSector(val, sSaveBlockChunks);
+    }
+    else
+    {
+        WriteSomeFlashByte0x25ToPrevSector(val, sSaveBlockChunks);
+        retVal = TRUE;
+    }
+    if (gDamagedSaveSectors)
+        DoSaveFailedScreen(1);
+    return retVal;
+}
+
+u8 Save_LoadGameData(u8 saveType)
+{
+    u8 result;
+
+    if (gFlashMemoryPresent != TRUE)
+    {
+        gSaveFileStatus = SAVE_STATUS_NO_FLASH;
+        return SAVE_STATUS_ERROR;
+    }
+
+    switch (saveType)
+    {
+    case SAVE_NORMAL:
+    default:
+        result = sub_812587C(0xFFFF, sSaveBlockChunks);
+        LoadSerializedGame();
+        gSaveFileStatus = result;
+        gGameContinueCallback = 0;
+        break;
+    case SAVE_HALL_OF_FAME:
+        result = ReadSomeUnknownSectorAndVerify(HALL_OF_FAME_SECTOR, sHallOfFameChunks[0].data, sHallOfFameChunks[0].size);
+        if (result == SAVE_STATUS_OK)
+            result = ReadSomeUnknownSectorAndVerify(HALL_OF_FAME_SECTOR + 1, sHallOfFameChunks[1].data, sHallOfFameChunks[1].size);
+        break;
+    }
+
+    return result;
+}
+
+const u8 sUnusedFlashSectors[] = { 30, 31 };
+
+bool8 unref_sub_8125F4C(struct UnkSaveSection *a1)
+{
+    u16 i;
+    char *raw = (char *)a1;
+
+    for (i = 0; i < sizeof(struct SaveSector); i++)
+        raw[i] = 0;
+
+    ReadFlash(sUnusedFlashSectors[0], 0, a1->data, 4096);
+
+    if (a1->signature != FILE_SIGNATURE)
+        return FALSE;
+
+    return TRUE;
+}
+
+u8 unref_sub_8125FA0(void)
+{
+    u16 i;
+    u8 status = Save_WriteData(SAVE_NORMAL);
+
+    for (i = 0; i < 2; i++)
+        EraseFlashSector(sUnusedFlashSectors[i]);
+
+    if (status == SAVE_STATUS_ERROR)
+    {
+        return 3;
+    }
+    else if (status == 3)
+    {
+        return 2;
+    }
+    else
+    {
+        Save_LoadGameData(SAVE_NORMAL);
+        return 1;
+    }
+}
+
+u8 unref_sub_8125FF0(u8 *data, u16 size)
+{
+    u16 i;
+    struct UnkSaveSection *section = (struct UnkSaveSection *)eSaveSection;
+
+    for (i = 0; i < sizeof(struct SaveSector); i++)
+        ((char *)section)[i] = 0;
+
+    section->signature = FILE_SIGNATURE;
+
+    for (i = 0; i < size; i++)
+        section->data[i] = data[i];
+
+    gLastSaveSectorStatus = ProgramFlashSectorAndVerifyNBytes(sUnusedFlashSectors[0], section, sizeof(struct SaveSector));
+
+    if (gLastSaveSectorStatus)
+        return SAVE_STATUS_ERROR;
+    else
+        return SAVE_STATUS_OK;
+}
+
+u8 unref_sub_8126068(u8 sector, u8 *data, u32 size)
+{
+    if (ProgramFlashSectorAndVerify(sector, data))
+        return SAVE_STATUS_ERROR;
+    else
+        return SAVE_STATUS_OK;
+}
+
+u8 unref_sub_8126080(u8 sector, u8 *data)
+{
+    ReadFlash(sector, 0, data, sizeof(struct SaveSector));
+    return 1;
+}