Split into ereader_helpers.c, faraway_island.c, and ereader_screen.c

8 files changed, 1466 insertions, 1449 deletions

diff --git a/src/ereader.c b/src/ereader.c
deleted file mode 100755
index 9941994ed..000000000
--- a/src/ereader.c
+++ /dev/null
@@ -1,1445 +0,0 @@
-#include "global.h"
-#include "alloc.h"
-#include "decompress.h"
-#include "event_data.h"
-#include "event_object_movement.h"
-#include "field_weather.h"
-#include "fieldmap.h"
-#include "link.h"
-#include "main.h"
-#include "metatile_behavior.h"
-#include "rom_8011DC0.h"
-#include "save.h"
-#include "sound.h"
-#include "sprite.h"
-#include "task.h"
-#include "strings.h"
-#include "util.h"
-#include "constants/event_objects.h"
-#include "constants/flags.h"
-#include "constants/maps.h"
-#include "constants/metatile_behaviors.h"
-#include "constants/songs.h"
-#include "constants/vars.h"
-
-struct Unk81D38FC
-{
-    u8 unk0[0x270];
-    int checksum;
-};
-
-struct Unknown030012C8
-{
-    u8 unk0[8];
-    u32 *unk8;
-    int unkC;
-    int unk10;
-    int unk14;
-};
-
-struct Unk03006370
-{
-    u16 unk0;
-    u32 unk4;
-    u32 *unk8;
-};
-
-struct Unk81D5014
-{
-    u16 unk0;
-    u16 unk2;
-    u16 unk4;
-    u16 unk6;
-    u8 unk8;
-    u8 unk9;
-    u8 unkA;
-    u8 unkB;
-    u8 unkC;
-    u8 unkD;
-    u8 unkE;
-    u8 *unk10;
-};
-
-void sub_81D41A0(void);
-static void sub_81D4170(void);
-int sub_81D3D70(u8, u32, u32*, u32*);
-void sub_81D41F4(void);
-static u16 sub_81D3EE8(u8);
-static void sub_81D413C(void);
-static void sub_81D414C(void);
-static void sub_81D3F1C(u32, u32*, u32*);
-static void sub_81D3F68(void);
-bool8 sub_81D4834(s16, s16);
-static bool8 sub_81D4C14(struct EventObject*, u8);
-static u8 sub_81D4C9C(struct EventObject*, u8);
-static u8 sub_81D4C58(struct EventObject*, u8);
-static u8 sub_81D4CE0(struct EventObject*, u8);
-static u8 sub_81D4D24(u8);
-static u8 sub_81D4890(u8);
-void sub_81D5084(u8);
-
-extern struct Unknown030012C8 gUnknown_030012C8;
-extern u16 gUnknown_030012E0;
-extern u16 gUnknown_030012E2;
-extern u16 gUnknown_030012E4;
-extern u16 gUnknown_030012E6;
-extern u32 gUnknown_030012E8;
-extern u16 gUnknown_030012EC;
-extern u16 gUnknown_030012EE;
-extern u16 gUnknown_030012F0;
-extern u16 gUnknown_030012F2;
-extern u16 gUnknown_030012F4;
-extern s16 gUnknown_030012F8;
-extern s16 gUnknown_030012FA;
-extern u8 gUnknown_030012FC[4];
-extern u8 gUnknown_0203CF50;
-extern struct Unk03006370 gUnknown_03006370;
-
-extern const u8 gUnknown_08625B6C[];
-extern const u8 gUnknown_089A3470[];
-extern const u8 gMultiBootProgram_BerryGlitchFix_Start[];
-extern const s16 gFarawayIslandRockCoords[4][2];
-
-extern const struct SpritePalette gFieldEffectObjectPaletteInfo1;
-extern const struct SpriteTemplate *const gFieldEffectObjectTemplatePointers[];
-
-static u8 sub_81D38D4(void)
-{
-    return (gSaveBlock1Ptr->trainerHill.unused + 1) % 256;
-}
-
-static bool32 sub_81D38FC(struct Unk81D38FC *arg0)
-{
-    int checksum = CalcByteArraySum(arg0->unk0, 0x270);
-    if (checksum != arg0->checksum)
-        return FALSE;
-
-    return TRUE;
-}
-
-bool8 sub_81D3920(u8 *buffer)
-{
-    u32 i;
-    u32 checksum;
-    int var0 = buffer[0];
-    if (var0 < 1 || var0 > 8)
-        return FALSE;
-
-    for (i = 0; i < var0; i++)
-    {
-        struct Unk81D38FC *var1 = (struct Unk81D38FC *)(&buffer[i * (sizeof(struct Unk81D38FC)) + 8]);
-        if (!sub_81D38FC(var1))
-            return FALSE;
-    }
-
-    checksum = CalcByteArraySum(buffer + 8, var0 * 0x274);
-    if (checksum != ((int *)buffer)[1])
-        return FALSE;
-
-    return TRUE;
-}
-
-static bool32 sub_81D396C(u8 *buffer)
-{
-    u32 checksum;
-    int var0 = buffer[0];
-    if (var0 < 1 || var0 > 8)
-        return FALSE;
-
-    checksum = CalcByteArraySum(buffer + 8, 0xEE0);
-    if (checksum != ((int *)buffer)[1])
-        return FALSE;
-
-    return TRUE;
-}
-
-static bool32 sub_81D3998(struct Unk81D38FC *arg0, u8 *buffer2)
-{
-    int i;
-    const u8 *ereaderVals;
-
-    memset(buffer2, 0, 0x1000);
-    buffer2[0] = arg0->unk0[0];
-    buffer2[1] = sub_81D38D4();
-    buffer2[2] = (arg0->unk0[0] + 1) / 2;
-
-    for (i = 0; i < arg0->unk0[0]; i++)
-    {
-        if (!(i & 1))
-        {
-            u8 *var0 = &buffer2[(i / 2) * 0x3B8];
-            u8 *var1 = arg0[i].unk0;
-            var0[8] = var1[8];
-            memcpy(&var0[0x29C], &var1[0x154], 0x124);
-            var0 += 0xC;
-            var1 += 0xC;
-            memcpy(var0, var1, 0x148);
-        }
-        else
-        {
-            u8 *var0 = &buffer2[(i / 2) * 0x3B8];
-            u8 *var1 = arg0[i].unk0;
-            var0[9] = var1[8];
-            memcpy(&var0[0x154], &var1[0xC], 0x148);
-        }
-    }
-
-    if (i & 1)
-    {
-        u8 *var0 = &buffer2[(i / 2) * 0x3B8];
-        var0 += 0x154;
-
-        ereaderVals = gUnknown_08625B6C;
-        memcpy(var0, &ereaderVals[(i / 2) * 0x148], 0x148);
-    }
-
-    ((int *)buffer2)[1] = CalcByteArraySum(buffer2 + 8, 0xEE0);
-    if (sub_8153634(SECTOR_ID_TRAINER_HILL, buffer2) != 1)
-        return FALSE;
-
-    return TRUE;
-}
-
-bool32 sub_81D3AB0(struct Unk81D38FC *arg0)
-{
-    u8 *var0 = AllocZeroed(0x1000);
-    bool32 result = sub_81D3998(arg0, var0);
-    Free(var0);
-    return result;
-}
-
-static bool32 sub_81D3AD8(u8 *arg0, u8 *arg1)
-{
-    if (TryCopySpecialSaveSection(SECTOR_ID_TRAINER_HILL, arg1) != 1)
-        return FALSE;
-
-    memcpy(arg0, arg1, 0xEE8);
-    if (!sub_81D396C(arg0))
-        return FALSE;
-
-    return TRUE;
-}
-
-static bool32 sub_81D3B0C(u8 *arg0)
-{
-    u8 *var0 = AllocZeroed(0x1000);
-    bool32 result = sub_81D3AD8(arg0, var0);
-    Free(var0);
-    return result;
-}
-
-bool32 sub_81D3B34(void)
-{
-    u8 *var0 = AllocZeroed(0x1000);
-    bool32 result = sub_81D3B0C(var0);
-    Free(var0);
-    return result;
-}
-
-static int unref_sub_81D3B54(int arg0, u32 *arg1)
-{
-    int result;
-    u16 var0;
-    int var1;
-
-    sub_81D41A0();
-    while (1)
-    {
-        sub_81D4170();
-        if (gUnknown_030012E2 & 2)
-            gShouldAdvanceLinkState = 2;
-
-        var1 = sub_81D3D70(1, arg0, arg1, NULL);
-        gUnknown_030012E4 = var1;
-        if ((gUnknown_030012E4 & 0x13) == 0x10)
-        {
-            result = 0;
-            break;
-        }
-
-        if (gUnknown_030012E4 & 0x8)
-        {
-            result = 1;
-            break;
-        }
-
-        var0 = gUnknown_030012E4 & 0x4;
-        if (var0)
-        {
-            result = 2;
-            break;
-        }
-
-        gShouldAdvanceLinkState = var0;
-        VBlankIntrWait();
-    }
-
-    CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
-    sub_81D41F4();
-    return result;
-}
-
-static int unref_sub_81D3BE8(u32 *arg0)
-{
-    int result;
-    u16 var0;
-    int var1;
-
-    sub_81D41A0();
-    while (1)
-    {
-        sub_81D4170();
-        if (gUnknown_030012E2 & 2)
-            gShouldAdvanceLinkState = 2;
-
-        var1 = sub_81D3D70(0, 0, NULL, arg0);
-        gUnknown_030012E4 = var1;
-        if ((gUnknown_030012E4 & 0x13) == 0x10)
-        {
-            result = 0;
-            break;
-        }
-
-        if (gUnknown_030012E4 & 0x8)
-        {
-            result = 1;
-            break;
-        }
-
-        var0 = gUnknown_030012E4 & 0x4;
-        if (var0)
-        {
-            result = 2;
-            break;
-        }
-
-        gShouldAdvanceLinkState = var0;
-        VBlankIntrWait();
-    }
-
-    CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
-    sub_81D41F4();
-    return result;
-}
-
-static void sub_81D3C7C(void)
-{
-    REG_IME = 0;
-    REG_IE &= ~(INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL);
-    REG_IME = 1;
-    REG_SIOCNT = 0;
-    REG_TM3CNT_H = 0;
-    REG_IF = INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL;
-}
-
-static void sub_81D3CBC(void)
-{
-    REG_IME = 0;
-    REG_IE &= ~(INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL);
-    REG_IME = 1;
-    REG_RCNT = 0;
-    REG_SIOCNT = SIO_MULTI_MODE;
-    REG_SIOCNT |= SIO_INTR_ENABLE | SIO_115200_BPS;
-    REG_IME = 0;
-    REG_IE |= INTR_FLAG_SERIAL;
-    REG_IME = 1;
-
-    if (!gUnknown_030012C8.unk0[1])
-        CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
-}
-
-static void sub_81D3D34(void)
-{
-    REG_RCNT = 0;
-    REG_SIOCNT = SIO_32BIT_MODE | SIO_INTR_ENABLE;
-    REG_SIOCNT |= SIO_MULTI_SD;
-    gShouldAdvanceLinkState = 0;
-    gUnknown_030012E6 = 0;
-    gUnknown_030012E8 = 0;
-}
-
-int sub_81D3D70(u8 arg0, u32 arg1, u32 *arg2, u32 *arg3)
-{
-    switch (gUnknown_030012C8.unk0[1])
-    {
-    case 0:
-        sub_81D3CBC();
-        gUnknown_030012C8.unk0[2] = 1;
-        gUnknown_030012C8.unk0[1] = 1;
-        break;
-    case 1:
-        if (sub_81D3EE8(arg0))
-            sub_81D413C();
-
-        if (gShouldAdvanceLinkState == 2)
-        {
-            gUnknown_030012C8.unk0[4] = 2;
-            gUnknown_030012C8.unk0[1] = 6;
-        }
-        break;
-    case 2:
-        sub_81D3D34();
-        sub_81D3F1C(arg1, arg2, arg3);
-        gUnknown_030012C8.unk0[1] = 3;
-        // fall through
-    case 3:
-        if (gShouldAdvanceLinkState == 2)
-        {
-            gUnknown_030012C8.unk0[4] = 2;
-            gUnknown_030012C8.unk0[1] = 6;
-        }
-        else
-        {
-            gUnknown_030012E6++;
-            gUnknown_030012E8++;
-            if (!gUnknown_030012C8.unk0[0] && gUnknown_030012E8 > 60)
-            {
-                gUnknown_030012C8.unk0[4] = 1;
-                gUnknown_030012C8.unk0[1] = 6;
-            }
-
-            if (gUnknown_030012C8.unk0[2] != 2)
-            {
-                if (gUnknown_030012C8.unk0[0] && gUnknown_030012E6 > 2)
-                {
-                    sub_81D413C();
-                    gUnknown_030012C8.unk0[2] = 2;
-                }
-                else
-                {
-                    sub_81D413C();
-                    gUnknown_030012C8.unk0[2] = 2;
-                }
-            }
-        }
-        break;
-    case 4:
-        sub_81D3CBC();
-        gUnknown_030012C8.unk0[1] = 5;
-        break;
-    case 5:
-        if (gUnknown_030012C8.unk0[0] == 1 && gUnknown_030012E6 > 2)
-            sub_81D413C();
-
-        if (++gUnknown_030012E6 > 60)
-        {
-            gUnknown_030012C8.unk0[4] = 1;
-            gUnknown_030012C8.unk0[1] = 6;
-        }
-        break;
-    case 6:
-        if (gUnknown_030012C8.unk0[2])
-        {
-            sub_81D3C7C();
-            gUnknown_030012C8.unk0[2] = 0;
-        }
-        break;
-    }
-
-    return gUnknown_030012C8.unk0[2] | (gUnknown_030012C8.unk0[4] << 2) | (gUnknown_030012C8.unk0[3] << 4);
-}
-
-static u16 sub_81D3EE8(u8 arg0)
-{
-    u16 terminal = (*(vu32 *)REG_ADDR_SIOCNT) & (SIO_MULTI_SI | SIO_MULTI_SD);
-    if (terminal == SIO_MULTI_SD && arg0)
-    {
-        gUnknown_030012C8.unk0[0] = 1;
-        return 1;
-    }
-    else
-    {
-        gUnknown_030012C8.unk0[0] = 0;
-        return 0;
-    }
-}
-
-static void sub_81D3F1C(u32 arg0, u32 *arg1, u32 *arg2)
-{
-    if (gUnknown_030012C8.unk0[0])
-    {
-        REG_SIOCNT |= SIO_38400_BPS;
-        gUnknown_030012C8.unk8 = arg1;
-        REG_SIODATA32 = arg0;
-        gUnknown_030012C8.unk10 = arg0 / 4 + 1;
-        sub_81D3F68();
-    }
-    else
-    {
-        REG_SIOCNT = REG_SIOCNT;
-        gUnknown_030012C8.unk8 = arg2;
-    }
-}
-
-static void sub_81D3F68(void)
-{
-    REG_TM3CNT_L = 0xFDA7;
-    REG_TM3CNT_H = TIMER_INTR_ENABLE;
-    REG_IME = 0;
-    REG_IE |= INTR_FLAG_TIMER3;
-    REG_IME = 1;
-}
-
-void sub_81D3F9C(void)
-{
-    sub_81D414C();
-    sub_81D413C();
-}
-
-void sub_81D3FAC(void)
-{
-    u16 i, playerCount, k;
-    u32 value;
-    u16 var0;
-    u16 recvBuffer[4];
-
-    switch (gUnknown_030012C8.unk0[1])
-    {
-    case 1:
-        REG_SIOMLT_SEND = 0xCCD0; // Handshake id
-        *(u64 *)recvBuffer = REG_SIOMLT_RECV;
-        for (i = 0, playerCount = 0, k = 0; i < 4; i++)
-        {
-            if (recvBuffer[i] == 0xCCD0)
-                playerCount++;
-            else if (recvBuffer[i] != 0xFFFF)
-                k++;
-        }
-
-        if (playerCount == 2 && k == 0)
-            gUnknown_030012C8.unk0[1] = 2;
-        break;
-    case 3:
-        value = REG_SIODATA32;
-        if (!gUnknown_030012C8.unkC && !gUnknown_030012C8.unk0[0])
-            gUnknown_030012C8.unk10 = value / 4 + 1;
-
-        if (gUnknown_030012C8.unk0[0] == 1)
-        {
-            if (gUnknown_030012C8.unkC < gUnknown_030012C8.unk10)
-            {
-                REG_SIODATA32 = gUnknown_030012C8.unk8[gUnknown_030012C8.unkC];
-                gUnknown_030012C8.unk14 += gUnknown_030012C8.unk8[gUnknown_030012C8.unkC];
-            }
-            else
-            {
-                REG_SIODATA32 = gUnknown_030012C8.unk14;
-            }
-        }
-        else
-        {
-            if (gUnknown_030012C8.unkC > 0 && gUnknown_030012C8.unkC < gUnknown_030012C8.unk10 + 1)
-            {
-                gUnknown_030012C8.unk8[gUnknown_030012C8.unkC - 1] = value;
-                gUnknown_030012C8.unk14 += value;
-            }
-            else if (gUnknown_030012C8.unkC)
-            {
-                if (gUnknown_030012C8.unk14 == value)
-                    gUnknown_030012C8.unk0[3] = 1;
-                else
-                    gUnknown_030012C8.unk0[3] = 2;
-            }
-
-            gUnknown_030012E8 = 0;
-        }
-
-        if (++gUnknown_030012C8.unkC < gUnknown_030012C8.unk10 + 2)
-        {
-            if (gUnknown_030012C8.unk0[0])
-                REG_TM3CNT_H |= TIMER_ENABLE;
-            else
-                sub_81D413C();
-        }
-        else
-        {
-            gUnknown_030012C8.unk0[1] = 4;
-            gUnknown_030012E6 = 0;
-        }
-        break;
-    case 5:
-        if (!gUnknown_030012C8.unk0[0])
-            REG_SIOMLT_SEND = gUnknown_030012C8.unk0[3];
-
-        *(u64 *)recvBuffer = REG_SIOMLT_RECV;
-        var0 = recvBuffer[1] - 1;
-        if (var0 < 2)
-        {
-            if (gUnknown_030012C8.unk0[0] == 1)
-                gUnknown_030012C8.unk0[3] = recvBuffer[1];
-
-            gUnknown_030012C8.unk0[1] = 6;
-        }
-        break;
-    }
-}
-
-static void sub_81D413C(void)
-{
-    REG_SIOCNT |= SIO_ENABLE;
-}
-
-static void sub_81D414C(void)
-{
-    REG_TM3CNT_H &= ~TIMER_ENABLE;
-    REG_TM3CNT_L = 0xFDA7;
-}
-
-static void sub_81D4170(void)
-{
-    int keysMask = REG_KEYINPUT ^ KEYS_MASK;
-    gUnknown_030012E2 = keysMask & ~gUnknown_030012E0;
-    gUnknown_030012E0 = keysMask;
-}
-
-void sub_81D41A0(void)
-{
-    gUnknown_030012EC = REG_IME;
-    gUnknown_030012EE = REG_IE;
-    gUnknown_030012F0 = REG_TM3CNT_H;
-    gUnknown_030012F2 = REG_SIOCNT;
-    gUnknown_030012F4 = REG_RCNT;
-}
-
-void sub_81D41F4(void)
-{
-    REG_IME = gUnknown_030012EC;
-    REG_IE = gUnknown_030012EE;
-    REG_TM3CNT_H = gUnknown_030012F0;
-    REG_SIOCNT = gUnknown_030012F2;
-    REG_RCNT = gUnknown_030012F4;
-}
-
-void sub_81D4238(void)
-{
-    CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
-}
-
-u8 sub_81D4258(void)
-{
-    u8 eventObjectId;
-    TryGetEventObjectIdByLocalIdAndMap(1, gSaveBlock1Ptr->location.mapNum, gSaveBlock1Ptr->location.mapGroup, &eventObjectId);
-    return eventObjectId;
-}
-
-u32 sub_81D427C(void)
-{
-    u8 i;
-    int skip;
-    struct EventObject *mew = &gEventObjects[sub_81D4258()];
-
-    gUnknown_030012F8 = gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x - mew->currentCoords.x;
-    gUnknown_030012FA = gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y - mew->currentCoords.y;
-    for (i = 0; i < ARRAY_COUNT(gUnknown_030012FC); i++)
-        gUnknown_030012FC[i] = DIR_NONE;
-
-    if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x == gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x
-     && gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y == gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y)
-    {
-        return DIR_NONE;
-    }
-
-    if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 8 == 0)
-        mew->invisible = 0;
-    else
-        mew->invisible = 1;
-
-    if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 9 == 0)
-        return DIR_NONE;
-
-    for (i = 0; i < ARRAY_COUNT(gFarawayIslandRockCoords); i++)
-    {
-        if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x == gFarawayIslandRockCoords[i][0])
-        {
-            skip = 0;
-            if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y < gFarawayIslandRockCoords[i][1])
-            {
-                if (mew->currentCoords.y <= gFarawayIslandRockCoords[i][1])
-                    skip = 1;
-            }
-            else
-            {
-                if (mew->currentCoords.y >= gFarawayIslandRockCoords[i][1])
-                    skip = 1;
-            }
-
-            if (!skip)
-            {
-                if (gUnknown_030012F8 > 0)
-                {
-                    if (mew->currentCoords.x + 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
-                    {
-                        if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
-                            return DIR_EAST;
-                    }
-                }
-                else if (gUnknown_030012F8 < 0)
-                {
-                    if (mew->currentCoords.x - 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
-                    {
-                        if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
-                            return DIR_WEST;
-                    }
-                }
-
-                if (mew->currentCoords.x == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
-                {
-                    if (gUnknown_030012FA > 0)
-                    {
-                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
-                            return DIR_NORTH;
-                    }
-                    else
-                    {
-                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
-                            return DIR_SOUTH;
-                    }
-                }
-            }
-        }
-
-        if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y == gFarawayIslandRockCoords[i][1])
-        {
-            skip = 0;
-            if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x < gFarawayIslandRockCoords[i][0])
-            {
-                if (mew->currentCoords.x <= gFarawayIslandRockCoords[i][0])
-                    skip = 1;
-            }
-            else
-            {
-                if (mew->currentCoords.x >= gFarawayIslandRockCoords[i][0])
-                    skip = 1;
-            }
-
-            if (!skip)
-            {
-                if (gUnknown_030012FA > 0)
-                {
-                    if (mew->currentCoords.y + 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
-                    {
-                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
-                            return DIR_SOUTH;
-                    }
-                }
-                else if (gUnknown_030012FA < 0)
-                {
-                    if (mew->currentCoords.y - 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
-                    {
-                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
-                            return DIR_NORTH;
-                    }
-                }
-
-                if (mew->currentCoords.y == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
-                {
-                    if (gUnknown_030012F8 > 0)
-                    {
-                        if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
-                            return DIR_WEST;
-                    }
-                    else
-                    {
-                        if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
-                            return DIR_EAST;
-                    }
-                }
-            }
-        }
-    }
-
-    if (sub_81D4C14(mew, 0))
-    {
-        if (sub_81D4C58(mew, 1))
-            return sub_81D4D24(2);
-        else if (sub_81D4CE0(mew, 1))
-            return sub_81D4D24(2);
-        else
-            return DIR_NORTH;
-    }
-
-    if (sub_81D4C9C(mew, 0))
-    {
-        if (sub_81D4C58(mew, 1))
-            return sub_81D4D24(2);
-        else if (sub_81D4CE0(mew, 1))
-            return sub_81D4D24(2);
-        else
-            return DIR_SOUTH;
-    }
-
-    if (sub_81D4C58(mew, 0))
-    {
-        if (sub_81D4C14(mew, 1))
-            return sub_81D4D24(2);
-        else if (sub_81D4C9C(mew, 1))
-            return sub_81D4D24(2);
-        else
-            return DIR_EAST;
-    }
-
-    if (sub_81D4CE0(mew, 0))
-    {
-        if (sub_81D4C14(mew, 1))
-            return sub_81D4D24(2);
-        else if (sub_81D4C9C(mew, 1))
-            return sub_81D4D24(2);
-        else
-            return DIR_WEST;
-    }
-
-    if (gUnknown_030012FA == 0)
-    {
-        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y > mew->currentCoords.y)
-        {
-            if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
-                return DIR_NORTH;
-        }
-
-        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y < mew->currentCoords.y)
-        {
-            if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
-                return DIR_SOUTH;
-        }
-
-        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
-            return DIR_NORTH;
-
-        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
-            return DIR_SOUTH;
-    }
-
-    if (gUnknown_030012F8 == 0)
-    {
-        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x > mew->currentCoords.x)
-        {
-            if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
-                return DIR_WEST;
-        }
-
-        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x < mew->currentCoords.x)
-        {
-            if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
-                return DIR_EAST;
-        }
-
-        if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
-            return DIR_EAST;
-
-        if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
-            return DIR_WEST;
-    }
-
-    return sub_81D4890(DIR_NONE);
-}
-
-bool8 sub_81D4834(s16 x, s16 y)
-{
-    if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x == x
-     && gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y == y)
-    {
-        return FALSE;
-    }
-
-    return MetatileBehavior_IsPokeGrass(MapGridGetMetatileBehaviorAt(x, y));
-}
-
-static u8 sub_81D4890(u8 ignoredDir)
-{
-    u8 i;
-    u8 count = 0;
-    struct EventObject *mew = &gEventObjects[sub_81D4258()];
-
-    for (i = 0; i < ARRAY_COUNT(gUnknown_030012FC); i++)
-        gUnknown_030012FC[i] = DIR_NONE;
-
-    if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1) == TRUE && ignoredDir != DIR_NORTH)
-    {
-        gUnknown_030012FC[count] = DIR_NORTH;
-        count++;
-    }
-
-    if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y) == TRUE && ignoredDir != DIR_EAST)
-    {
-        gUnknown_030012FC[count] = DIR_EAST;
-        count++;
-    }
-
-    if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1) == TRUE && ignoredDir != DIR_SOUTH)
-    {
-        gUnknown_030012FC[count] = DIR_SOUTH;
-        count++;
-    }
-
-    if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y) == TRUE && ignoredDir != DIR_WEST)
-    {
-        gUnknown_030012FC[count] = DIR_WEST;
-        count++;
-    }
-
-    if (count > 1)
-        return gUnknown_030012FC[VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % count];
-    else
-        return gUnknown_030012FC[0];
-}
-
-void UpdateFarawayIslandStepCounter(void)
-{
-    u16 steps = VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER);
-    if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
-     && gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
-    {
-        steps++;
-        if (steps >= 9999)
-            VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, 0);
-        else
-            VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, steps);
-    }
-}
-
-bool8 EventObjectIsFarawayIslandMew(struct EventObject *eventObject)
-{
-    if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
-     && gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
-    {
-        if (eventObject->graphicsId == EVENT_OBJ_GFX_MEW)
-            return TRUE;
-    }
-
-    return FALSE;
-}
-
-bool8 IsMewPlayingHideAndSeek(void)
-{
-    if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
-     && gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
-    {
-        if (FlagGet(FLAG_CAUGHT_MEW) != TRUE && FlagGet(FLAG_HIDE_MEW) != TRUE)
-            return TRUE;
-    }
-
-    return FALSE;
-}
-
-bool8 sub_81D4A58(struct EventObject *eventObject)
-{
-    if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) != 0xFFFF
-     && VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 4 == 0)
-        return TRUE;
-
-    return FALSE;
-}
-
-void sub_81D4A90(void)
-{
-    s16 x;
-    s16 y;
-    u8 spriteId;
-    struct EventObject *mew = &gEventObjects[sub_81D4258()];
-
-    mew->invisible = 0;
-    if (gSpecialVar_0x8004 == 1)
-    {
-        mew->fixedPriority = 1;
-        gSprites[mew->spriteId].subspriteMode = SUBSPRITES_IGNORE_PRIORITY;
-        gSprites[mew->spriteId].subpriority = 1;
-    }
-    else
-    {
-        VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, 0xFFFF);
-        mew->fixedPriority = 1;
-        gSprites[mew->spriteId].subspriteMode = SUBSPRITES_IGNORE_PRIORITY;
-        if (gSpecialVar_Facing != DIR_NORTH)
-            gSprites[mew->spriteId].subpriority = 1;
-
-        LoadSpritePalette(&gFieldEffectObjectPaletteInfo1);
-        UpdateSpritePaletteWithWeather(IndexOfSpritePaletteTag(gFieldEffectObjectPaletteInfo1.tag));
-
-        x = mew->currentCoords.x;
-        y = mew->currentCoords.y;
-        sub_80930E0(&x, &y, 8, 8);
-        gUnknown_0203CF50 = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[15], x, y, gSprites[mew->spriteId].subpriority - 1);
-        if (gUnknown_0203CF50 != MAX_SPRITES)
-        {
-            struct Sprite *sprite = &gSprites[gUnknown_0203CF50];
-            sprite->coordOffsetEnabled = 1;
-            sprite->oam.priority = 2;
-            sprite->callback = SpriteCallbackDummy;
-        }
-    }
-}
-
-void sub_81D4BEC(void)
-{
-    if (gUnknown_0203CF50 != MAX_SPRITES)
-        DestroySprite(&gSprites[gUnknown_0203CF50]);
-}
-
-static bool8 sub_81D4C14(struct EventObject *mew, u8 index)
-{
-    if (gUnknown_030012FA > 0 && sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
-    {
-        gUnknown_030012FC[index] = DIR_NORTH;
-        return TRUE;
-    }
-
-    return FALSE;
-}
-
-static u8 sub_81D4C58(struct EventObject *mew, u8 index)
-{
-    if (gUnknown_030012F8 < 0 && sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
-    {
-        gUnknown_030012FC[index] = DIR_EAST;
-        return TRUE;
-    }
-
-    return FALSE;
-}
-
-static u8 sub_81D4C9C(struct EventObject *mew, u8 index)
-{
-    if (gUnknown_030012FA < 0 && sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
-    {
-        gUnknown_030012FC[index] = DIR_SOUTH;
-        return TRUE;
-    }
-
-    return FALSE;
-}
-
-static u8 sub_81D4CE0(struct EventObject *mew, u8 index)
-{
-    if (gUnknown_030012F8 > 0 && sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
-    {
-        gUnknown_030012FC[index] = DIR_WEST;
-        return TRUE;
-    }
-
-    return FALSE;
-}
-
-static u8 sub_81D4D24(u8 mod)
-{
-    return gUnknown_030012FC[VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % mod];
-}
-
-void sub_81D4D50(struct Unk03006370 *arg0, int arg1, u32 *arg2)
-{
-    volatile u16 backupIME = REG_IME;
-    REG_IME = 0;
-    gIntrTable[1] = sub_81D3FAC;
-    gIntrTable[2] = sub_81D3F9C;
-    sub_81D41A0();
-    sub_81D4238();
-    REG_IE |= INTR_FLAG_VCOUNT;
-    REG_IME = backupIME;
-    arg0->unk0 = 0;
-    arg0->unk4 = arg1;
-    arg0->unk8 = arg2;
-}
-
-void sub_81D4DB8(struct Unk03006370 *arg0)
-{
-    volatile u16 backupIME = REG_IME;
-    REG_IME = 0;
-    sub_81D4238();
-    sub_81D41F4();
-    RestoreSerialTimer3IntrHandlers();
-    REG_IME = backupIME;
-}
-
-u8 sub_81D4DE8(struct Unk03006370 *arg0)
-{
-    u8 var0 = 0;
-    arg0->unk0 = sub_81D3D70(1, arg0->unk4, arg0->unk8, NULL);
-    if ((arg0->unk0 & 0x13) == 0x10)
-        var0 = 1;
-
-    if (arg0->unk0 & 0x8)
-        var0 = 2;
-
-    if (arg0->unk0 & 0x4)
-        var0 = 3;
-
-    gShouldAdvanceLinkState = 0;
-    return var0;
-}
-
-void sub_81D4E30(void)
-{
-    memset(gDecompressionBuffer, 0, 0x2000);
-    gLinkType = 0x5503;
-    OpenLink();
-    SetSuppressLinkErrorMessage(TRUE);
-}
-
-bool32 sub_81D4E60(void)
-{
-    volatile u16 backupIME;
-    u16 sp4[4];
-
-    backupIME = REG_IME;
-    REG_IME = 0;
-    *(u64 *)sp4 = *(u64 *)gLink.tempRecvBuffer;
-    REG_IME = backupIME;
-    if (sp4[0] == 0xB9A0 && sp4[1] == 0xCCD0
-     && sp4[2] == 0xFFFF && sp4[3] == 0xFFFF)
-    {
-        return TRUE;
-    }
-
-    return FALSE;
-}
-
-bool32 sub_81D4EC0(void)
-{
-    if (IsLinkMaster() && GetLinkPlayerCount_2() == 2)
-        return TRUE;
-
-    return FALSE;
-}
-
-u32 sub_81D4EE4(u8 *arg0, u16 *arg1)
-{
-    u8 var0;
-
-    var0 = *arg0 - 3;
-    if (var0 < 3 && HasLinkErrorOccurred())
-    {
-        *arg0 = 0;
-        return 3;
-    }
-
-    switch (*arg0)
-    {
-    case 0:
-        if (IsLinkMaster() && GetLinkPlayerCount_2() > 1)
-        {
-            *arg0 = 1;
-        }
-        else if (gMain.newKeys & B_BUTTON)
-        {
-            *arg0 = 0;
-            return 1;
-        }
-        break;
-    case 1:
-        if (++(*arg1) > 5)
-        {
-            *arg1 = 0;
-            *arg0 = 2;
-        }
-        break;
-    case 2:
-        if (GetLinkPlayerCount_2() == 2)
-        {
-            PlaySE(SE_PINPON);
-            CheckShouldAdvanceLinkState();
-            *arg1 = 0;
-            *arg0 = 3;
-        }
-        else if (gMain.newKeys & B_BUTTON)
-        {
-            *arg0 = 0;
-            return 1;
-        }
-        break;
-    case 3:
-        if (++(*arg1) > 30)
-        {
-            *arg0 = 0;
-            return 5;
-        }
-
-        if (IsLinkConnectionEstablished())
-        {
-            if (gReceivedRemoteLinkPlayers)
-            {
-                if (IsLinkPlayerDataExchangeComplete())
-                {
-                    *arg0 = 0;
-                    return 2;
-                }
-                else
-                {
-                    *arg0 = 4;
-                }
-            }
-            else
-            {
-                *arg0 = 3;
-            }
-        }
-        break;
-    case 4:
-        sub_800ABF4(0);
-        *arg0 = 5;
-        break;
-    case 5:
-        if (!gReceivedRemoteLinkPlayers)
-        {
-            *arg0 = 0;
-            return 4;
-        }
-        break;
-    default:
-        return 0;
-    }
-
-    return 0;
-}
-
-void sub_81D5014(void)
-{
-    int value;
-    struct Unk81D5014 *data;
-    u8 taskId = CreateTask(sub_81D5084, 0);
-    data = (struct Unk81D5014 *)gTasks[taskId].data;
-    data->unk8 = 0;
-    data->unk9 = 0;
-    data->unkA = 0;
-    data->unkB = 0;
-    data->unkC = 0;
-    data->unkD = 0;
-    data->unk0 = 0;
-    data->unk2 = 0;
-    data->unk4 = 0;
-    data->unk6 = 0;
-    data->unkE = 0;
-    data->unk10 = AllocZeroed(0x40);
-}
-
-void sub_81D505C(u16 *arg0)
-{
-    *arg0 = 0;
-}
-
-bool32 sub_81D5064(u16 *arg0, u16 arg1)
-{
-    if (++(*arg0) > arg1)
-    {
-        *arg0 = 0;
-        return TRUE;
-    }
-    
-    return FALSE;
-}
-
-void sub_81D5084(u8 taskId)
-{
-    struct Unk81D5014 *data = (struct Unk81D5014 *)gTasks[taskId].data;
-    switch (data->unk8)
-    {
-    case 0:
-        if (mevent_0814257C(&data->unk9, gUnknown_085EDFD6))
-            data->unk8 = 1;
-        break;
-    case 1:
-        sub_81D4E30();
-        sub_81D505C(&data->unk0);
-        data->unk8 = 2;
-        break;
-    case 2:
-        if (sub_81D5064(&data->unk0, 10))
-            data->unk8 = 3;
-        break;
-    case 3:
-        if (!sub_81D4EC0())
-        {
-            CloseLink();
-            data->unk8 = 4;
-        }
-        else
-        {
-            data->unk8 = 13;
-        }
-        break;
-    case 4:
-        if (mevent_0814257C(&data->unk9, gUnknown_085EDFF5))
-        {
-            sub_8018884(gUnknown_085EE014);
-            sub_81D505C(&data->unk0);
-            data->unk8 = 5;
-        }
-        break;
-    case 5:
-        if (sub_81D5064(&data->unk0, 90))
-        {
-            sub_81D4E30();
-            data->unk8 = 6;
-        }
-        else if (gMain.newKeys & B_BUTTON)
-        {
-            sub_81D505C(&data->unk0);
-            PlaySE(SE_SELECT);
-            data->unk8 = 23;
-        }
-        break;
-    case 6:
-        if (gMain.newKeys & B_BUTTON)
-        {
-            PlaySE(SE_SELECT);
-            CloseLink();
-            sub_81D505C(&data->unk0);
-            data->unk8 = 23;
-        }
-        else if (GetLinkPlayerCount_2() > 1)
-        {
-            sub_81D505C(&data->unk0);
-            CloseLink();
-            data->unk8 = 7;
-        }
-        else if (sub_81D4E60())
-        {
-            PlaySE(SE_SELECT);
-            CloseLink();
-            sub_81D505C(&data->unk0);
-            data->unk8 = 8;
-        }
-        else if (sub_81D5064(&data->unk0, 10))
-        {
-            CloseLink();
-            sub_81D4E30();
-            sub_81D505C(&data->unk0);
-        }
-        break;
-    case 7:
-        if (mevent_0814257C(&data->unk9, gUnknown_085EE05C))
-            data->unk8 = 4;
-        break;
-    case 8:
-        sub_8018884(gUnknown_085EE097);
-        // XXX: This (u32*) cast is discarding the const qualifier from gUnknown_089A3470
-        sub_81D4D50(&gUnknown_03006370, gMultiBootProgram_BerryGlitchFix_Start - gUnknown_089A3470, (u32*)gUnknown_089A3470);
-        data->unk8 = 9;
-        break;
-    case 9:
-        data->unkE = sub_81D4DE8(&gUnknown_03006370);
-        if (data->unkE)
-            data->unk8 = 10;
-        break;
-    case 10:
-        sub_81D4DB8(&gUnknown_03006370);
-        if (data->unkE == 3)
-        {
-            data->unk8 = 20;
-        }
-        else if (data->unkE == 1)
-        {
-            sub_81D505C(&data->unk0);
-            sub_8018884(gUnknown_085EE120);
-            data->unk8 = 11;
-        }
-        else
-        {
-            data->unk8 = 0;
-        }
-        break;
-    case 11:
-        if (sub_81D5064(&data->unk0, 840))
-            data->unk8 = 12;
-        break;
-    case 12:
-        sub_81D4E30();
-        sub_8018884(gUnknown_085EE0DC);
-        data->unk8 = 13;
-        break;
-    case 13:
-        switch (sub_81D4EE4(&data->unk9, &data->unk0))
-        {
-            case 0:
-                break;
-            case 2:
-                sub_8018884(gUnknown_085EE097);
-                data->unk8 = 14;
-                break;
-            case 1:
-                PlaySE(SE_SELECT);
-                CloseLink();
-                data->unk8 = 23;
-                break;
-            case 5:
-                CloseLink();
-                data->unk8 = 21;
-                break;
-            case 3:
-            case 4:
-                CloseLink();
-                data->unk8 = 20;
-                break;
-        }
-        break;
-    case 14:
-        if (HasLinkErrorOccurred())
-        {
-            CloseLink();
-            data->unk8 = 20;
-        }
-        else if (GetBlockReceivedStatus())
-        {
-            ResetBlockReceivedFlags();
-            data->unk8 = 15;
-        }
-        break;
-    case 15:
-        data->unkE = sub_81D3920(gDecompressionBuffer);
-        sub_800ABF4(data->unkE);
-        data->unk8 = 16;
-        break;
-    case 16:
-        if (!gReceivedRemoteLinkPlayers)
-        {
-            if (data->unkE == 1)
-                data->unk8 = 17;
-            else
-                data->unk8 = 20;
-        }
-        break;
-    case 17:
-        if (sub_81D3AB0((struct Unk81D38FC *)&gDecompressionBuffer))
-        {
-            sub_8018884(gUnknown_085EE0FA);
-            sub_81D505C(&data->unk0);
-            data->unk8 = 18;
-        }
-        else
-        {
-            data->unk8 = 22;
-        }
-        break;
-    case 18:
-        if (sub_81D5064(&data->unk0, 120))
-        {
-            sub_8018884(gUnknown_085EE107);
-            PlayFanfare(MUS_FANFA4);
-            data->unk8 = 19;
-        }
-        break;
-    case 19:
-        if (IsFanfareTaskInactive() && (gMain.newKeys & (A_BUTTON | B_BUTTON)))
-            data->unk8 = 26;
-        break;
-    case 23:
-        if (mevent_0814257C(&data->unk9,gUnknown_085EE06B))
-            data->unk8 = 26;
-        break;
-    case 20:
-        if (mevent_0814257C(&data->unk9, gUnknown_085EE0A3))
-            data->unk8 = 0;
-        break;
-    case 21:
-        if (mevent_0814257C(&data->unk9, gUnknown_085EE0BF))
-            data->unk8 = 0;
-        break;
-    case 22:
-        if (mevent_0814257C(&data->unk9, gUnknown_085EE12D))
-            data->unk8 = 0;
-        break;
-    case 26:
-        Free(data->unk10);
-        DestroyTask(taskId);
-        SetMainCallback2(sub_80186A4);
-        break;
-    }
-}
diff --git a/src/ereader_helpers.c b/src/ereader_helpers.c
new file mode 100755
index 000000000..6c92b676f
--- /dev/null
+++ b/src/ereader_helpers.c
@@ -0,0 +1,553 @@
+#include "global.h"
+#include "alloc.h"
+#include "decompress.h"
+#include "ereader_helpers.h"
+#include "link.h"
+#include "main.h"
+#include "rom_8011DC0.h"
+#include "save.h"
+#include "sprite.h"
+#include "task.h"
+#include "util.h"
+
+struct Unknown030012C8
+{
+    u8 unk0[8];
+    u32 *unk8;
+    int unkC;
+    int unk10;
+    int unk14;
+};
+
+static void sub_81D4170(void);
+static u16 sub_81D3EE8(u8);
+static void sub_81D413C(void);
+static void sub_81D414C(void);
+static void sub_81D3F1C(u32, u32*, u32*);
+static void sub_81D3F68(void);
+
+extern struct Unknown030012C8 gUnknown_030012C8;
+extern u16 gUnknown_030012E0;
+extern u16 gUnknown_030012E2;
+extern u16 gUnknown_030012E4;
+extern u16 gUnknown_030012E6;
+extern u32 gUnknown_030012E8;
+extern u16 gUnknown_030012EC;
+extern u16 gUnknown_030012EE;
+extern u16 gUnknown_030012F0;
+extern u16 gUnknown_030012F2;
+extern u16 gUnknown_030012F4;
+
+extern const u8 gUnknown_08625B6C[];
+
+static u8 sub_81D38D4(void)
+{
+    return (gSaveBlock1Ptr->trainerHill.unused + 1) % 256;
+}
+
+static bool32 sub_81D38FC(struct Unk81D38FC *arg0)
+{
+    int checksum = CalcByteArraySum(arg0->unk0, 0x270);
+    if (checksum != arg0->checksum)
+        return FALSE;
+
+    return TRUE;
+}
+
+bool8 sub_81D3920(u8 *buffer)
+{
+    u32 i;
+    u32 checksum;
+    int var0 = buffer[0];
+    if (var0 < 1 || var0 > 8)
+        return FALSE;
+
+    for (i = 0; i < var0; i++)
+    {
+        struct Unk81D38FC *var1 = (struct Unk81D38FC *)(&buffer[i * (sizeof(struct Unk81D38FC)) + 8]);
+        if (!sub_81D38FC(var1))
+            return FALSE;
+    }
+
+    checksum = CalcByteArraySum(buffer + 8, var0 * 0x274);
+    if (checksum != ((int *)buffer)[1])
+        return FALSE;
+
+    return TRUE;
+}
+
+static bool32 sub_81D396C(u8 *buffer)
+{
+    u32 checksum;
+    int var0 = buffer[0];
+    if (var0 < 1 || var0 > 8)
+        return FALSE;
+
+    checksum = CalcByteArraySum(buffer + 8, 0xEE0);
+    if (checksum != ((int *)buffer)[1])
+        return FALSE;
+
+    return TRUE;
+}
+
+static bool32 sub_81D3998(struct Unk81D38FC *arg0, u8 *buffer2)
+{
+    int i;
+    const u8 *ereaderVals;
+
+    memset(buffer2, 0, 0x1000);
+    buffer2[0] = arg0->unk0[0];
+    buffer2[1] = sub_81D38D4();
+    buffer2[2] = (arg0->unk0[0] + 1) / 2;
+
+    for (i = 0; i < arg0->unk0[0]; i++)
+    {
+        if (!(i & 1))
+        {
+            u8 *var0 = &buffer2[(i / 2) * 0x3B8];
+            u8 *var1 = arg0[i].unk0;
+            var0[8] = var1[8];
+            memcpy(&var0[0x29C], &var1[0x154], 0x124);
+            var0 += 0xC;
+            var1 += 0xC;
+            memcpy(var0, var1, 0x148);
+        }
+        else
+        {
+            u8 *var0 = &buffer2[(i / 2) * 0x3B8];
+            u8 *var1 = arg0[i].unk0;
+            var0[9] = var1[8];
+            memcpy(&var0[0x154], &var1[0xC], 0x148);
+        }
+    }
+
+    if (i & 1)
+    {
+        u8 *var0 = &buffer2[(i / 2) * 0x3B8];
+        var0 += 0x154;
+
+        ereaderVals = gUnknown_08625B6C;
+        memcpy(var0, &ereaderVals[(i / 2) * 0x148], 0x148);
+    }
+
+    ((int *)buffer2)[1] = CalcByteArraySum(buffer2 + 8, 0xEE0);
+    if (sub_8153634(SECTOR_ID_TRAINER_HILL, buffer2) != 1)
+        return FALSE;
+
+    return TRUE;
+}
+
+bool32 sub_81D3AB0(struct Unk81D38FC *arg0)
+{
+    u8 *var0 = AllocZeroed(0x1000);
+    bool32 result = sub_81D3998(arg0, var0);
+    Free(var0);
+    return result;
+}
+
+static bool32 sub_81D3AD8(u8 *arg0, u8 *arg1)
+{
+    if (TryCopySpecialSaveSection(SECTOR_ID_TRAINER_HILL, arg1) != 1)
+        return FALSE;
+
+    memcpy(arg0, arg1, 0xEE8);
+    if (!sub_81D396C(arg0))
+        return FALSE;
+
+    return TRUE;
+}
+
+static bool32 sub_81D3B0C(u8 *arg0)
+{
+    u8 *var0 = AllocZeroed(0x1000);
+    bool32 result = sub_81D3AD8(arg0, var0);
+    Free(var0);
+    return result;
+}
+
+bool32 sub_81D3B34(void)
+{
+    u8 *var0 = AllocZeroed(0x1000);
+    bool32 result = sub_81D3B0C(var0);
+    Free(var0);
+    return result;
+}
+
+static int unref_sub_81D3B54(int arg0, u32 *arg1)
+{
+    int result;
+    u16 var0;
+    int var1;
+
+    sub_81D41A0();
+    while (1)
+    {
+        sub_81D4170();
+        if (gUnknown_030012E2 & 2)
+            gShouldAdvanceLinkState = 2;
+
+        var1 = sub_81D3D70(1, arg0, arg1, NULL);
+        gUnknown_030012E4 = var1;
+        if ((gUnknown_030012E4 & 0x13) == 0x10)
+        {
+            result = 0;
+            break;
+        }
+
+        if (gUnknown_030012E4 & 0x8)
+        {
+            result = 1;
+            break;
+        }
+
+        var0 = gUnknown_030012E4 & 0x4;
+        if (var0)
+        {
+            result = 2;
+            break;
+        }
+
+        gShouldAdvanceLinkState = var0;
+        VBlankIntrWait();
+    }
+
+    CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
+    sub_81D41F4();
+    return result;
+}
+
+static int unref_sub_81D3BE8(u32 *arg0)
+{
+    int result;
+    u16 var0;
+    int var1;
+
+    sub_81D41A0();
+    while (1)
+    {
+        sub_81D4170();
+        if (gUnknown_030012E2 & 2)
+            gShouldAdvanceLinkState = 2;
+
+        var1 = sub_81D3D70(0, 0, NULL, arg0);
+        gUnknown_030012E4 = var1;
+        if ((gUnknown_030012E4 & 0x13) == 0x10)
+        {
+            result = 0;
+            break;
+        }
+
+        if (gUnknown_030012E4 & 0x8)
+        {
+            result = 1;
+            break;
+        }
+
+        var0 = gUnknown_030012E4 & 0x4;
+        if (var0)
+        {
+            result = 2;
+            break;
+        }
+
+        gShouldAdvanceLinkState = var0;
+        VBlankIntrWait();
+    }
+
+    CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
+    sub_81D41F4();
+    return result;
+}
+
+static void sub_81D3C7C(void)
+{
+    REG_IME = 0;
+    REG_IE &= ~(INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL);
+    REG_IME = 1;
+    REG_SIOCNT = 0;
+    REG_TM3CNT_H = 0;
+    REG_IF = INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL;
+}
+
+static void sub_81D3CBC(void)
+{
+    REG_IME = 0;
+    REG_IE &= ~(INTR_FLAG_TIMER3 | INTR_FLAG_SERIAL);
+    REG_IME = 1;
+    REG_RCNT = 0;
+    REG_SIOCNT = SIO_MULTI_MODE;
+    REG_SIOCNT |= SIO_INTR_ENABLE | SIO_115200_BPS;
+    REG_IME = 0;
+    REG_IE |= INTR_FLAG_SERIAL;
+    REG_IME = 1;
+
+    if (!gUnknown_030012C8.unk0[1])
+        CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
+}
+
+static void sub_81D3D34(void)
+{
+    REG_RCNT = 0;
+    REG_SIOCNT = SIO_32BIT_MODE | SIO_INTR_ENABLE;
+    REG_SIOCNT |= SIO_MULTI_SD;
+    gShouldAdvanceLinkState = 0;
+    gUnknown_030012E6 = 0;
+    gUnknown_030012E8 = 0;
+}
+
+int sub_81D3D70(u8 arg0, u32 arg1, u32 *arg2, u32 *arg3)
+{
+    switch (gUnknown_030012C8.unk0[1])
+    {
+    case 0:
+        sub_81D3CBC();
+        gUnknown_030012C8.unk0[2] = 1;
+        gUnknown_030012C8.unk0[1] = 1;
+        break;
+    case 1:
+        if (sub_81D3EE8(arg0))
+            sub_81D413C();
+
+        if (gShouldAdvanceLinkState == 2)
+        {
+            gUnknown_030012C8.unk0[4] = 2;
+            gUnknown_030012C8.unk0[1] = 6;
+        }
+        break;
+    case 2:
+        sub_81D3D34();
+        sub_81D3F1C(arg1, arg2, arg3);
+        gUnknown_030012C8.unk0[1] = 3;
+        // fall through
+    case 3:
+        if (gShouldAdvanceLinkState == 2)
+        {
+            gUnknown_030012C8.unk0[4] = 2;
+            gUnknown_030012C8.unk0[1] = 6;
+        }
+        else
+        {
+            gUnknown_030012E6++;
+            gUnknown_030012E8++;
+            if (!gUnknown_030012C8.unk0[0] && gUnknown_030012E8 > 60)
+            {
+                gUnknown_030012C8.unk0[4] = 1;
+                gUnknown_030012C8.unk0[1] = 6;
+            }
+
+            if (gUnknown_030012C8.unk0[2] != 2)
+            {
+                if (gUnknown_030012C8.unk0[0] && gUnknown_030012E6 > 2)
+                {
+                    sub_81D413C();
+                    gUnknown_030012C8.unk0[2] = 2;
+                }
+                else
+                {
+                    sub_81D413C();
+                    gUnknown_030012C8.unk0[2] = 2;
+                }
+            }
+        }
+        break;
+    case 4:
+        sub_81D3CBC();
+        gUnknown_030012C8.unk0[1] = 5;
+        break;
+    case 5:
+        if (gUnknown_030012C8.unk0[0] == 1 && gUnknown_030012E6 > 2)
+            sub_81D413C();
+
+        if (++gUnknown_030012E6 > 60)
+        {
+            gUnknown_030012C8.unk0[4] = 1;
+            gUnknown_030012C8.unk0[1] = 6;
+        }
+        break;
+    case 6:
+        if (gUnknown_030012C8.unk0[2])
+        {
+            sub_81D3C7C();
+            gUnknown_030012C8.unk0[2] = 0;
+        }
+        break;
+    }
+
+    return gUnknown_030012C8.unk0[2] | (gUnknown_030012C8.unk0[4] << 2) | (gUnknown_030012C8.unk0[3] << 4);
+}
+
+static u16 sub_81D3EE8(u8 arg0)
+{
+    u16 terminal = (*(vu32 *)REG_ADDR_SIOCNT) & (SIO_MULTI_SI | SIO_MULTI_SD);
+    if (terminal == SIO_MULTI_SD && arg0)
+    {
+        gUnknown_030012C8.unk0[0] = 1;
+        return 1;
+    }
+    else
+    {
+        gUnknown_030012C8.unk0[0] = 0;
+        return 0;
+    }
+}
+
+static void sub_81D3F1C(u32 arg0, u32 *arg1, u32 *arg2)
+{
+    if (gUnknown_030012C8.unk0[0])
+    {
+        REG_SIOCNT |= SIO_38400_BPS;
+        gUnknown_030012C8.unk8 = arg1;
+        REG_SIODATA32 = arg0;
+        gUnknown_030012C8.unk10 = arg0 / 4 + 1;
+        sub_81D3F68();
+    }
+    else
+    {
+        REG_SIOCNT = REG_SIOCNT;
+        gUnknown_030012C8.unk8 = arg2;
+    }
+}
+
+static void sub_81D3F68(void)
+{
+    REG_TM3CNT_L = 0xFDA7;
+    REG_TM3CNT_H = TIMER_INTR_ENABLE;
+    REG_IME = 0;
+    REG_IE |= INTR_FLAG_TIMER3;
+    REG_IME = 1;
+}
+
+void sub_81D3F9C(void)
+{
+    sub_81D414C();
+    sub_81D413C();
+}
+
+void sub_81D3FAC(void)
+{
+    u16 i, playerCount, k;
+    u32 value;
+    u16 var0;
+    u16 recvBuffer[4];
+
+    switch (gUnknown_030012C8.unk0[1])
+    {
+    case 1:
+        REG_SIOMLT_SEND = 0xCCD0; // Handshake id
+        *(u64 *)recvBuffer = REG_SIOMLT_RECV;
+        for (i = 0, playerCount = 0, k = 0; i < 4; i++)
+        {
+            if (recvBuffer[i] == 0xCCD0)
+                playerCount++;
+            else if (recvBuffer[i] != 0xFFFF)
+                k++;
+        }
+
+        if (playerCount == 2 && k == 0)
+            gUnknown_030012C8.unk0[1] = 2;
+        break;
+    case 3:
+        value = REG_SIODATA32;
+        if (!gUnknown_030012C8.unkC && !gUnknown_030012C8.unk0[0])
+            gUnknown_030012C8.unk10 = value / 4 + 1;
+
+        if (gUnknown_030012C8.unk0[0] == 1)
+        {
+            if (gUnknown_030012C8.unkC < gUnknown_030012C8.unk10)
+            {
+                REG_SIODATA32 = gUnknown_030012C8.unk8[gUnknown_030012C8.unkC];
+                gUnknown_030012C8.unk14 += gUnknown_030012C8.unk8[gUnknown_030012C8.unkC];
+            }
+            else
+            {
+                REG_SIODATA32 = gUnknown_030012C8.unk14;
+            }
+        }
+        else
+        {
+            if (gUnknown_030012C8.unkC > 0 && gUnknown_030012C8.unkC < gUnknown_030012C8.unk10 + 1)
+            {
+                gUnknown_030012C8.unk8[gUnknown_030012C8.unkC - 1] = value;
+                gUnknown_030012C8.unk14 += value;
+            }
+            else if (gUnknown_030012C8.unkC)
+            {
+                if (gUnknown_030012C8.unk14 == value)
+                    gUnknown_030012C8.unk0[3] = 1;
+                else
+                    gUnknown_030012C8.unk0[3] = 2;
+            }
+
+            gUnknown_030012E8 = 0;
+        }
+
+        if (++gUnknown_030012C8.unkC < gUnknown_030012C8.unk10 + 2)
+        {
+            if (gUnknown_030012C8.unk0[0])
+                REG_TM3CNT_H |= TIMER_ENABLE;
+            else
+                sub_81D413C();
+        }
+        else
+        {
+            gUnknown_030012C8.unk0[1] = 4;
+            gUnknown_030012E6 = 0;
+        }
+        break;
+    case 5:
+        if (!gUnknown_030012C8.unk0[0])
+            REG_SIOMLT_SEND = gUnknown_030012C8.unk0[3];
+
+        *(u64 *)recvBuffer = REG_SIOMLT_RECV;
+        var0 = recvBuffer[1] - 1;
+        if (var0 < 2)
+        {
+            if (gUnknown_030012C8.unk0[0] == 1)
+                gUnknown_030012C8.unk0[3] = recvBuffer[1];
+
+            gUnknown_030012C8.unk0[1] = 6;
+        }
+        break;
+    }
+}
+
+static void sub_81D413C(void)
+{
+    REG_SIOCNT |= SIO_ENABLE;
+}
+
+static void sub_81D414C(void)
+{
+    REG_TM3CNT_H &= ~TIMER_ENABLE;
+    REG_TM3CNT_L = 0xFDA7;
+}
+
+static void sub_81D4170(void)
+{
+    int keysMask = REG_KEYINPUT ^ KEYS_MASK;
+    gUnknown_030012E2 = keysMask & ~gUnknown_030012E0;
+    gUnknown_030012E0 = keysMask;
+}
+
+void sub_81D41A0(void)
+{
+    gUnknown_030012EC = REG_IME;
+    gUnknown_030012EE = REG_IE;
+    gUnknown_030012F0 = REG_TM3CNT_H;
+    gUnknown_030012F2 = REG_SIOCNT;
+    gUnknown_030012F4 = REG_RCNT;
+}
+
+void sub_81D41F4(void)
+{
+    REG_IME = gUnknown_030012EC;
+    REG_IE = gUnknown_030012EE;
+    REG_TM3CNT_H = gUnknown_030012F0;
+    REG_SIOCNT = gUnknown_030012F2;
+    REG_RCNT = gUnknown_030012F4;
+}
+
+void sub_81D4238(void)
+{
+    CpuFill32(0, &gUnknown_030012C8, sizeof(struct Unknown030012C8));
+}
diff --git a/src/ereader_screen.c b/src/ereader_screen.c
new file mode 100755
index 000000000..b15c1fd0c
--- /dev/null
+++ b/src/ereader_screen.c
@@ -0,0 +1,464 @@
+#include "global.h"
+#include "alloc.h"
+#include "decompress.h"
+#include "ereader_helpers.h"
+#include "link.h"
+#include "main.h"
+#include "rom_8011DC0.h"
+#include "save.h"
+#include "sound.h"
+#include "sprite.h"
+#include "task.h"
+#include "strings.h"
+#include "util.h"
+#include "constants/songs.h"
+
+struct Unk81D5014
+{
+    u16 unk0;
+    u16 unk2;
+    u16 unk4;
+    u16 unk6;
+    u8 unk8;
+    u8 unk9;
+    u8 unkA;
+    u8 unkB;
+    u8 unkC;
+    u8 unkD;
+    u8 unkE;
+    u8 *unk10;
+};
+
+struct Unk03006370
+{
+    u16 unk0;
+    u32 unk4;
+    u32 *unk8;
+};
+
+static void sub_81D5084(u8);
+
+extern struct Unk03006370 gUnknown_03006370;
+
+extern const u8 gUnknown_089A3470[];
+extern const u8 gMultiBootProgram_BerryGlitchFix_Start[];
+
+static void sub_81D4D50(struct Unk03006370 *arg0, int arg1, u32 *arg2)
+{
+    volatile u16 backupIME = REG_IME;
+    REG_IME = 0;
+    gIntrTable[1] = sub_81D3FAC;
+    gIntrTable[2] = sub_81D3F9C;
+    sub_81D41A0();
+    sub_81D4238();
+    REG_IE |= INTR_FLAG_VCOUNT;
+    REG_IME = backupIME;
+    arg0->unk0 = 0;
+    arg0->unk4 = arg1;
+    arg0->unk8 = arg2;
+}
+
+static void sub_81D4DB8(struct Unk03006370 *arg0)
+{
+    volatile u16 backupIME = REG_IME;
+    REG_IME = 0;
+    sub_81D4238();
+    sub_81D41F4();
+    RestoreSerialTimer3IntrHandlers();
+    REG_IME = backupIME;
+}
+
+static u8 sub_81D4DE8(struct Unk03006370 *arg0)
+{
+    u8 var0 = 0;
+    arg0->unk0 = sub_81D3D70(1, arg0->unk4, arg0->unk8, NULL);
+    if ((arg0->unk0 & 0x13) == 0x10)
+        var0 = 1;
+
+    if (arg0->unk0 & 0x8)
+        var0 = 2;
+
+    if (arg0->unk0 & 0x4)
+        var0 = 3;
+
+    gShouldAdvanceLinkState = 0;
+    return var0;
+}
+
+static void sub_81D4E30(void)
+{
+    memset(gDecompressionBuffer, 0, 0x2000);
+    gLinkType = 0x5503;
+    OpenLink();
+    SetSuppressLinkErrorMessage(TRUE);
+}
+
+static bool32 sub_81D4E60(void)
+{
+    volatile u16 backupIME;
+    u16 sp4[4];
+
+    backupIME = REG_IME;
+    REG_IME = 0;
+    *(u64 *)sp4 = *(u64 *)gLink.tempRecvBuffer;
+    REG_IME = backupIME;
+    if (sp4[0] == 0xB9A0 && sp4[1] == 0xCCD0
+     && sp4[2] == 0xFFFF && sp4[3] == 0xFFFF)
+    {
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+static bool32 sub_81D4EC0(void)
+{
+    if (IsLinkMaster() && GetLinkPlayerCount_2() == 2)
+        return TRUE;
+
+    return FALSE;
+}
+
+static u32 sub_81D4EE4(u8 *arg0, u16 *arg1)
+{
+    u8 var0;
+
+    var0 = *arg0 - 3;
+    if (var0 < 3 && HasLinkErrorOccurred())
+    {
+        *arg0 = 0;
+        return 3;
+    }
+
+    switch (*arg0)
+    {
+    case 0:
+        if (IsLinkMaster() && GetLinkPlayerCount_2() > 1)
+        {
+            *arg0 = 1;
+        }
+        else if (gMain.newKeys & B_BUTTON)
+        {
+            *arg0 = 0;
+            return 1;
+        }
+        break;
+    case 1:
+        if (++(*arg1) > 5)
+        {
+            *arg1 = 0;
+            *arg0 = 2;
+        }
+        break;
+    case 2:
+        if (GetLinkPlayerCount_2() == 2)
+        {
+            PlaySE(SE_PINPON);
+            CheckShouldAdvanceLinkState();
+            *arg1 = 0;
+            *arg0 = 3;
+        }
+        else if (gMain.newKeys & B_BUTTON)
+        {
+            *arg0 = 0;
+            return 1;
+        }
+        break;
+    case 3:
+        if (++(*arg1) > 30)
+        {
+            *arg0 = 0;
+            return 5;
+        }
+
+        if (IsLinkConnectionEstablished())
+        {
+            if (gReceivedRemoteLinkPlayers)
+            {
+                if (IsLinkPlayerDataExchangeComplete())
+                {
+                    *arg0 = 0;
+                    return 2;
+                }
+                else
+                {
+                    *arg0 = 4;
+                }
+            }
+            else
+            {
+                *arg0 = 3;
+            }
+        }
+        break;
+    case 4:
+        sub_800ABF4(0);
+        *arg0 = 5;
+        break;
+    case 5:
+        if (!gReceivedRemoteLinkPlayers)
+        {
+            *arg0 = 0;
+            return 4;
+        }
+        break;
+    default:
+        return 0;
+    }
+
+    return 0;
+}
+
+void sub_81D5014(void)
+{
+    int value;
+    struct Unk81D5014 *data;
+    u8 taskId = CreateTask(sub_81D5084, 0);
+    data = (struct Unk81D5014 *)gTasks[taskId].data;
+    data->unk8 = 0;
+    data->unk9 = 0;
+    data->unkA = 0;
+    data->unkB = 0;
+    data->unkC = 0;
+    data->unkD = 0;
+    data->unk0 = 0;
+    data->unk2 = 0;
+    data->unk4 = 0;
+    data->unk6 = 0;
+    data->unkE = 0;
+    data->unk10 = AllocZeroed(0x40);
+}
+
+static void sub_81D505C(u16 *arg0)
+{
+    *arg0 = 0;
+}
+
+static bool32 sub_81D5064(u16 *arg0, u16 arg1)
+{
+    if (++(*arg0) > arg1)
+    {
+        *arg0 = 0;
+        return TRUE;
+    }
+    
+    return FALSE;
+}
+
+static void sub_81D5084(u8 taskId)
+{
+    struct Unk81D5014 *data = (struct Unk81D5014 *)gTasks[taskId].data;
+    switch (data->unk8)
+    {
+    case 0:
+        if (mevent_0814257C(&data->unk9, gUnknown_085EDFD6))
+            data->unk8 = 1;
+        break;
+    case 1:
+        sub_81D4E30();
+        sub_81D505C(&data->unk0);
+        data->unk8 = 2;
+        break;
+    case 2:
+        if (sub_81D5064(&data->unk0, 10))
+            data->unk8 = 3;
+        break;
+    case 3:
+        if (!sub_81D4EC0())
+        {
+            CloseLink();
+            data->unk8 = 4;
+        }
+        else
+        {
+            data->unk8 = 13;
+        }
+        break;
+    case 4:
+        if (mevent_0814257C(&data->unk9, gUnknown_085EDFF5))
+        {
+            sub_8018884(gUnknown_085EE014);
+            sub_81D505C(&data->unk0);
+            data->unk8 = 5;
+        }
+        break;
+    case 5:
+        if (sub_81D5064(&data->unk0, 90))
+        {
+            sub_81D4E30();
+            data->unk8 = 6;
+        }
+        else if (gMain.newKeys & B_BUTTON)
+        {
+            sub_81D505C(&data->unk0);
+            PlaySE(SE_SELECT);
+            data->unk8 = 23;
+        }
+        break;
+    case 6:
+        if (gMain.newKeys & B_BUTTON)
+        {
+            PlaySE(SE_SELECT);
+            CloseLink();
+            sub_81D505C(&data->unk0);
+            data->unk8 = 23;
+        }
+        else if (GetLinkPlayerCount_2() > 1)
+        {
+            sub_81D505C(&data->unk0);
+            CloseLink();
+            data->unk8 = 7;
+        }
+        else if (sub_81D4E60())
+        {
+            PlaySE(SE_SELECT);
+            CloseLink();
+            sub_81D505C(&data->unk0);
+            data->unk8 = 8;
+        }
+        else if (sub_81D5064(&data->unk0, 10))
+        {
+            CloseLink();
+            sub_81D4E30();
+            sub_81D505C(&data->unk0);
+        }
+        break;
+    case 7:
+        if (mevent_0814257C(&data->unk9, gUnknown_085EE05C))
+            data->unk8 = 4;
+        break;
+    case 8:
+        sub_8018884(gUnknown_085EE097);
+        // XXX: This (u32*) cast is discarding the const qualifier from gUnknown_089A3470
+        sub_81D4D50(&gUnknown_03006370, gMultiBootProgram_BerryGlitchFix_Start - gUnknown_089A3470, (u32*)gUnknown_089A3470);
+        data->unk8 = 9;
+        break;
+    case 9:
+        data->unkE = sub_81D4DE8(&gUnknown_03006370);
+        if (data->unkE)
+            data->unk8 = 10;
+        break;
+    case 10:
+        sub_81D4DB8(&gUnknown_03006370);
+        if (data->unkE == 3)
+        {
+            data->unk8 = 20;
+        }
+        else if (data->unkE == 1)
+        {
+            sub_81D505C(&data->unk0);
+            sub_8018884(gUnknown_085EE120);
+            data->unk8 = 11;
+        }
+        else
+        {
+            data->unk8 = 0;
+        }
+        break;
+    case 11:
+        if (sub_81D5064(&data->unk0, 840))
+            data->unk8 = 12;
+        break;
+    case 12:
+        sub_81D4E30();
+        sub_8018884(gUnknown_085EE0DC);
+        data->unk8 = 13;
+        break;
+    case 13:
+        switch (sub_81D4EE4(&data->unk9, &data->unk0))
+        {
+            case 0:
+                break;
+            case 2:
+                sub_8018884(gUnknown_085EE097);
+                data->unk8 = 14;
+                break;
+            case 1:
+                PlaySE(SE_SELECT);
+                CloseLink();
+                data->unk8 = 23;
+                break;
+            case 5:
+                CloseLink();
+                data->unk8 = 21;
+                break;
+            case 3:
+            case 4:
+                CloseLink();
+                data->unk8 = 20;
+                break;
+        }
+        break;
+    case 14:
+        if (HasLinkErrorOccurred())
+        {
+            CloseLink();
+            data->unk8 = 20;
+        }
+        else if (GetBlockReceivedStatus())
+        {
+            ResetBlockReceivedFlags();
+            data->unk8 = 15;
+        }
+        break;
+    case 15:
+        data->unkE = sub_81D3920(gDecompressionBuffer);
+        sub_800ABF4(data->unkE);
+        data->unk8 = 16;
+        break;
+    case 16:
+        if (!gReceivedRemoteLinkPlayers)
+        {
+            if (data->unkE == 1)
+                data->unk8 = 17;
+            else
+                data->unk8 = 20;
+        }
+        break;
+    case 17:
+        if (sub_81D3AB0((struct Unk81D38FC *)&gDecompressionBuffer))
+        {
+            sub_8018884(gUnknown_085EE0FA);
+            sub_81D505C(&data->unk0);
+            data->unk8 = 18;
+        }
+        else
+        {
+            data->unk8 = 22;
+        }
+        break;
+    case 18:
+        if (sub_81D5064(&data->unk0, 120))
+        {
+            sub_8018884(gUnknown_085EE107);
+            PlayFanfare(MUS_FANFA4);
+            data->unk8 = 19;
+        }
+        break;
+    case 19:
+        if (IsFanfareTaskInactive() && (gMain.newKeys & (A_BUTTON | B_BUTTON)))
+            data->unk8 = 26;
+        break;
+    case 23:
+        if (mevent_0814257C(&data->unk9,gUnknown_085EE06B))
+            data->unk8 = 26;
+        break;
+    case 20:
+        if (mevent_0814257C(&data->unk9, gUnknown_085EE0A3))
+            data->unk8 = 0;
+        break;
+    case 21:
+        if (mevent_0814257C(&data->unk9, gUnknown_085EE0BF))
+            data->unk8 = 0;
+        break;
+    case 22:
+        if (mevent_0814257C(&data->unk9, gUnknown_085EE12D))
+            data->unk8 = 0;
+        break;
+    case 26:
+        Free(data->unk10);
+        DestroyTask(taskId);
+        SetMainCallback2(sub_80186A4);
+        break;
+    }
+}
diff --git a/src/event_object_movement.c b/src/event_object_movement.c
index 8ebdd883f..30dffd8d7 100644
--- a/src/event_object_movement.c
+++ b/src/event_object_movement.c
@@ -3,10 +3,10 @@
 #include "battle_pyramid.h"
 #include "berry.h"
 #include "decoration.h"
-#include "ereader.h"
 #include "event_data.h"
 #include "event_object_movement.h"
 #include "event_scripts.h"
+#include "faraway_island.h"
 #include "field_camera.h"
 #include "field_effect.h"
 #include "field_effect_helpers.h"
diff --git a/src/faraway_island.c b/src/faraway_island.c
new file mode 100755
index 000000000..1c8dff14e
--- /dev/null
+++ b/src/faraway_island.c
@@ -0,0 +1,445 @@
+#include "global.h"
+#include "event_data.h"
+#include "event_object_movement.h"
+#include "field_weather.h"
+#include "fieldmap.h"
+#include "metatile_behavior.h"
+#include "sprite.h"
+#include "constants/event_objects.h"
+#include "constants/flags.h"
+#include "constants/maps.h"
+#include "constants/metatile_behaviors.h"
+#include "constants/vars.h"
+
+static u8 sub_81D4890(u8);
+static bool8 sub_81D4C14(struct EventObject*, u8);
+static u8 sub_81D4C9C(struct EventObject*, u8);
+static u8 sub_81D4C58(struct EventObject*, u8);
+static u8 sub_81D4CE0(struct EventObject*, u8);
+static u8 sub_81D4D24(u8);
+static bool8 sub_81D4834(s16, s16);
+
+extern u8 gUnknown_0203CF50;
+extern s16 gUnknown_030012F8;
+extern s16 gUnknown_030012FA;
+extern u8 gUnknown_030012FC[4];
+
+extern const struct SpritePalette gFieldEffectObjectPaletteInfo1;
+extern const struct SpriteTemplate *const gFieldEffectObjectTemplatePointers[];
+
+static const s16 sFarawayIslandRockCoords[4][2] =
+{
+    {21, 16},
+    {25, 16},
+    {16, 17},
+    {20, 20},
+};
+
+static u8 sub_81D4258(void)
+{
+    u8 eventObjectId;
+    TryGetEventObjectIdByLocalIdAndMap(1, gSaveBlock1Ptr->location.mapNum, gSaveBlock1Ptr->location.mapGroup, &eventObjectId);
+    return eventObjectId;
+}
+
+u32 sub_81D427C(void)
+{
+    u8 i;
+    int skip;
+    struct EventObject *mew = &gEventObjects[sub_81D4258()];
+
+    gUnknown_030012F8 = gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x - mew->currentCoords.x;
+    gUnknown_030012FA = gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y - mew->currentCoords.y;
+    for (i = 0; i < ARRAY_COUNT(gUnknown_030012FC); i++)
+        gUnknown_030012FC[i] = DIR_NONE;
+
+    if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x == gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x
+     && gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y == gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y)
+    {
+        return DIR_NONE;
+    }
+
+    if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 8 == 0)
+        mew->invisible = 0;
+    else
+        mew->invisible = 1;
+
+    if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 9 == 0)
+        return DIR_NONE;
+
+    for (i = 0; i < ARRAY_COUNT(sFarawayIslandRockCoords); i++)
+    {
+        if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x == sFarawayIslandRockCoords[i][0])
+        {
+            skip = 0;
+            if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y < sFarawayIslandRockCoords[i][1])
+            {
+                if (mew->currentCoords.y <= sFarawayIslandRockCoords[i][1])
+                    skip = 1;
+            }
+            else
+            {
+                if (mew->currentCoords.y >= sFarawayIslandRockCoords[i][1])
+                    skip = 1;
+            }
+
+            if (!skip)
+            {
+                if (gUnknown_030012F8 > 0)
+                {
+                    if (mew->currentCoords.x + 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
+                    {
+                        if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
+                            return DIR_EAST;
+                    }
+                }
+                else if (gUnknown_030012F8 < 0)
+                {
+                    if (mew->currentCoords.x - 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
+                    {
+                        if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
+                            return DIR_WEST;
+                    }
+                }
+
+                if (mew->currentCoords.x == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x)
+                {
+                    if (gUnknown_030012FA > 0)
+                    {
+                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
+                            return DIR_NORTH;
+                    }
+                    else
+                    {
+                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
+                            return DIR_SOUTH;
+                    }
+                }
+            }
+        }
+
+        if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y == sFarawayIslandRockCoords[i][1])
+        {
+            skip = 0;
+            if (gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.x < sFarawayIslandRockCoords[i][0])
+            {
+                if (mew->currentCoords.x <= sFarawayIslandRockCoords[i][0])
+                    skip = 1;
+            }
+            else
+            {
+                if (mew->currentCoords.x >= sFarawayIslandRockCoords[i][0])
+                    skip = 1;
+            }
+
+            if (!skip)
+            {
+                if (gUnknown_030012FA > 0)
+                {
+                    if (mew->currentCoords.y + 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
+                    {
+                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
+                            return DIR_SOUTH;
+                    }
+                }
+                else if (gUnknown_030012FA < 0)
+                {
+                    if (mew->currentCoords.y - 1 == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
+                    {
+                        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
+                            return DIR_NORTH;
+                    }
+                }
+
+                if (mew->currentCoords.y == gEventObjects[gPlayerAvatar.eventObjectId].previousCoords.y)
+                {
+                    if (gUnknown_030012F8 > 0)
+                    {
+                        if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
+                            return DIR_WEST;
+                    }
+                    else
+                    {
+                        if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
+                            return DIR_EAST;
+                    }
+                }
+            }
+        }
+    }
+
+    if (sub_81D4C14(mew, 0))
+    {
+        if (sub_81D4C58(mew, 1))
+            return sub_81D4D24(2);
+        else if (sub_81D4CE0(mew, 1))
+            return sub_81D4D24(2);
+        else
+            return DIR_NORTH;
+    }
+
+    if (sub_81D4C9C(mew, 0))
+    {
+        if (sub_81D4C58(mew, 1))
+            return sub_81D4D24(2);
+        else if (sub_81D4CE0(mew, 1))
+            return sub_81D4D24(2);
+        else
+            return DIR_SOUTH;
+    }
+
+    if (sub_81D4C58(mew, 0))
+    {
+        if (sub_81D4C14(mew, 1))
+            return sub_81D4D24(2);
+        else if (sub_81D4C9C(mew, 1))
+            return sub_81D4D24(2);
+        else
+            return DIR_EAST;
+    }
+
+    if (sub_81D4CE0(mew, 0))
+    {
+        if (sub_81D4C14(mew, 1))
+            return sub_81D4D24(2);
+        else if (sub_81D4C9C(mew, 1))
+            return sub_81D4D24(2);
+        else
+            return DIR_WEST;
+    }
+
+    if (gUnknown_030012FA == 0)
+    {
+        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y > mew->currentCoords.y)
+        {
+            if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
+                return DIR_NORTH;
+        }
+
+        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y < mew->currentCoords.y)
+        {
+            if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
+                return DIR_SOUTH;
+        }
+
+        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
+            return DIR_NORTH;
+
+        if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
+            return DIR_SOUTH;
+    }
+
+    if (gUnknown_030012F8 == 0)
+    {
+        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x > mew->currentCoords.x)
+        {
+            if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
+                return DIR_WEST;
+        }
+
+        if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x < mew->currentCoords.x)
+        {
+            if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
+                return DIR_EAST;
+        }
+
+        if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
+            return DIR_EAST;
+
+        if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
+            return DIR_WEST;
+    }
+
+    return sub_81D4890(DIR_NONE);
+}
+
+static bool8 sub_81D4834(s16 x, s16 y)
+{
+    if (gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.x == x
+     && gEventObjects[gPlayerAvatar.eventObjectId].currentCoords.y == y)
+    {
+        return FALSE;
+    }
+
+    return MetatileBehavior_IsPokeGrass(MapGridGetMetatileBehaviorAt(x, y));
+}
+
+static u8 sub_81D4890(u8 ignoredDir)
+{
+    u8 i;
+    u8 count = 0;
+    struct EventObject *mew = &gEventObjects[sub_81D4258()];
+
+    for (i = 0; i < ARRAY_COUNT(gUnknown_030012FC); i++)
+        gUnknown_030012FC[i] = DIR_NONE;
+
+    if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1) == TRUE && ignoredDir != DIR_NORTH)
+    {
+        gUnknown_030012FC[count] = DIR_NORTH;
+        count++;
+    }
+
+    if (sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y) == TRUE && ignoredDir != DIR_EAST)
+    {
+        gUnknown_030012FC[count] = DIR_EAST;
+        count++;
+    }
+
+    if (sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1) == TRUE && ignoredDir != DIR_SOUTH)
+    {
+        gUnknown_030012FC[count] = DIR_SOUTH;
+        count++;
+    }
+
+    if (sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y) == TRUE && ignoredDir != DIR_WEST)
+    {
+        gUnknown_030012FC[count] = DIR_WEST;
+        count++;
+    }
+
+    if (count > 1)
+        return gUnknown_030012FC[VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % count];
+    else
+        return gUnknown_030012FC[0];
+}
+
+void UpdateFarawayIslandStepCounter(void)
+{
+    u16 steps = VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER);
+    if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
+     && gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
+    {
+        steps++;
+        if (steps >= 9999)
+            VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, 0);
+        else
+            VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, steps);
+    }
+}
+
+bool8 EventObjectIsFarawayIslandMew(struct EventObject *eventObject)
+{
+    if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
+     && gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
+    {
+        if (eventObject->graphicsId == EVENT_OBJ_GFX_MEW)
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
+bool8 IsMewPlayingHideAndSeek(void)
+{
+    if (gSaveBlock1Ptr->location.mapNum == MAP_NUM(FARAWAY_ISLAND_INTERIOR)
+     && gSaveBlock1Ptr->location.mapGroup == MAP_GROUP(FARAWAY_ISLAND_INTERIOR))
+    {
+        if (FlagGet(FLAG_CAUGHT_MEW) != TRUE && FlagGet(FLAG_HIDE_MEW) != TRUE)
+            return TRUE;
+    }
+
+    return FALSE;
+}
+
+bool8 sub_81D4A58(struct EventObject *eventObject)
+{
+    if (VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) != 0xFFFF
+     && VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % 4 == 0)
+        return TRUE;
+
+    return FALSE;
+}
+
+void sub_81D4A90(void)
+{
+    s16 x;
+    s16 y;
+    u8 spriteId;
+    struct EventObject *mew = &gEventObjects[sub_81D4258()];
+
+    mew->invisible = 0;
+    if (gSpecialVar_0x8004 == 1)
+    {
+        mew->fixedPriority = 1;
+        gSprites[mew->spriteId].subspriteMode = SUBSPRITES_IGNORE_PRIORITY;
+        gSprites[mew->spriteId].subpriority = 1;
+    }
+    else
+    {
+        VarSet(VAR_FARAWAY_ISLAND_STEP_COUNTER, 0xFFFF);
+        mew->fixedPriority = 1;
+        gSprites[mew->spriteId].subspriteMode = SUBSPRITES_IGNORE_PRIORITY;
+        if (gSpecialVar_Facing != DIR_NORTH)
+            gSprites[mew->spriteId].subpriority = 1;
+
+        LoadSpritePalette(&gFieldEffectObjectPaletteInfo1);
+        UpdateSpritePaletteWithWeather(IndexOfSpritePaletteTag(gFieldEffectObjectPaletteInfo1.tag));
+
+        x = mew->currentCoords.x;
+        y = mew->currentCoords.y;
+        sub_80930E0(&x, &y, 8, 8);
+        gUnknown_0203CF50 = CreateSpriteAtEnd(gFieldEffectObjectTemplatePointers[15], x, y, gSprites[mew->spriteId].subpriority - 1);
+        if (gUnknown_0203CF50 != MAX_SPRITES)
+        {
+            struct Sprite *sprite = &gSprites[gUnknown_0203CF50];
+            sprite->coordOffsetEnabled = 1;
+            sprite->oam.priority = 2;
+            sprite->callback = SpriteCallbackDummy;
+        }
+    }
+}
+
+void sub_81D4BEC(void)
+{
+    if (gUnknown_0203CF50 != MAX_SPRITES)
+        DestroySprite(&gSprites[gUnknown_0203CF50]);
+}
+
+static bool8 sub_81D4C14(struct EventObject *mew, u8 index)
+{
+    if (gUnknown_030012FA > 0 && sub_81D4834(mew->currentCoords.x, mew->currentCoords.y - 1))
+    {
+        gUnknown_030012FC[index] = DIR_NORTH;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+static u8 sub_81D4C58(struct EventObject *mew, u8 index)
+{
+    if (gUnknown_030012F8 < 0 && sub_81D4834(mew->currentCoords.x + 1, mew->currentCoords.y))
+    {
+        gUnknown_030012FC[index] = DIR_EAST;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+static u8 sub_81D4C9C(struct EventObject *mew, u8 index)
+{
+    if (gUnknown_030012FA < 0 && sub_81D4834(mew->currentCoords.x, mew->currentCoords.y + 1))
+    {
+        gUnknown_030012FC[index] = DIR_SOUTH;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+static u8 sub_81D4CE0(struct EventObject *mew, u8 index)
+{
+    if (gUnknown_030012F8 > 0 && sub_81D4834(mew->currentCoords.x - 1, mew->currentCoords.y))
+    {
+        gUnknown_030012FC[index] = DIR_WEST;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+static u8 sub_81D4D24(u8 mod)
+{
+    return gUnknown_030012FC[VarGet(VAR_FARAWAY_ISLAND_STEP_COUNTER) % mod];
+}
diff --git a/src/field_control_avatar.c b/src/field_control_avatar.c
index b28052ee2..6735df3a0 100644
--- a/src/field_control_avatar.c
+++ b/src/field_control_avatar.c
@@ -3,7 +3,7 @@
 #include "bike.h"
 #include "coord_event_weather.h"
 #include "daycare.h"
-#include "ereader.h"
+#include "faraway_island.h"
 #include "event_data.h"
 #include "event_object_movement.h"
 #include "event_scripts.h"
diff --git a/src/fldeff_cut.c b/src/fldeff_cut.c
index f1a65cf8c..3da1a9217 100644
--- a/src/fldeff_cut.c
+++ b/src/fldeff_cut.c
@@ -1,7 +1,7 @@
 #include "global.h"
-#include "ereader.h"
 #include "event_obj_lock.h"
 #include "event_object_movement.h"
+#include "faraway_island.h"
 #include "field_camera.h"
 #include "field_effect.h"
 #include "field_player_avatar.h"
diff --git a/src/trainer_hill.c b/src/trainer_hill.c
index 7bb1b997a..eafd1eb3d 100644
--- a/src/trainer_hill.c
+++ b/src/trainer_hill.c
@@ -3,7 +3,7 @@
 #include "battle.h"
 #include "battle_tower.h"
 #include "battle_setup.h"
-#include "ereader.h"
+#include "ereader_helpers.h"
 #include "event_data.h"
 #include "event_scripts.h"
 #include "fieldmap.h"