Merge remote-tracking branch 'pret/master'

3 files changed, 939 insertions, 2 deletions

diff --git a/src/safari_zone.c b/src/safari_zone.c
index 37ee664cd..fdfdd961a 100644
--- a/src/safari_zone.c
+++ b/src/safari_zone.c
@@ -34,7 +34,7 @@ extern void c2_exit_to_overworld_2_switch(void);
 extern void c2_exit_to_overworld_1_continue_scripts_restart_music(void);
 extern void c2_load_new_map(void);
 extern void sub_80AF6F0(void);
-extern void script_env_2_set_ctx_paused(void);
+extern void ScriptContext1_Stop(void);
 extern void warp_in(void);
 extern void GetXYCoordsOneStepInFrontOfPlayer(s16* x, s16* y);
 extern void PlayerGetDestCoords(s16* x, s16* y);
@@ -124,7 +124,7 @@ void sub_80FC190(void)
     else if (gBattleOutcome == BATTLE_CAUGHT)
     {
         ScriptContext1_SetupScript(gUnknown_082A4B9B);
-        script_env_2_set_ctx_paused();
+        ScriptContext1_Stop();
         SetMainCallback2(c2_exit_to_overworld_1_continue_scripts_restart_music);
     }
 }
diff --git a/src/script.c b/src/script.c
new file mode 100644
index 000000000..b2809a137
--- /dev/null
+++ b/src/script.c
@@ -0,0 +1,434 @@
+#include "global.h"
+#include "script.h"
+#include "event_data.h"
+#include "util.h"
+
+#define RAM_SCRIPT_MAGIC 51
+
+extern u8* gUnknown_020375C0;
+
+extern bool32 sub_801B27C(void);
+
+// ewram bss
+IWRAM_DATA static u8 sScriptContext1Status;
+IWRAM_DATA static u32 sUnusedVariable1;
+IWRAM_DATA static struct ScriptContext sScriptContext1;
+IWRAM_DATA static u32 sUnusedVariable2;
+IWRAM_DATA static struct ScriptContext sScriptContext2;
+IWRAM_DATA static bool8 sScriptContext2Enabled;
+
+extern ScrCmdFunc gScriptCmdTable[];
+extern ScrCmdFunc gScriptCmdTableEnd[];
+extern void *gNullScriptPtr;
+
+void InitScriptContext(struct ScriptContext *ctx, void *cmdTable, void *cmdTableEnd)
+{
+    s32 i;
+
+    ctx->mode = 0;
+    ctx->scriptPtr = 0;
+    ctx->stackDepth = 0;
+    ctx->nativePtr = 0;
+    ctx->cmdTable = cmdTable;
+    ctx->cmdTableEnd = cmdTableEnd;
+
+    for (i = 0; i < 4; i++)
+        ctx->data[i] = 0;
+
+    for (i = 0; i < 20; i++)
+        ctx->stack[i] = 0;
+}
+
+u8 SetupBytecodeScript(struct ScriptContext *ctx, const u8 *ptr)
+{
+    ctx->scriptPtr = ptr;
+    ctx->mode = 1;
+    return 1;
+}
+
+void SetupNativeScript(struct ScriptContext *ctx, bool8 (*ptr)(void))
+{
+    ctx->mode = 2;
+    ctx->nativePtr = ptr;
+}
+
+void StopScript(struct ScriptContext *ctx)
+{
+    ctx->mode = 0;
+    ctx->scriptPtr = 0;
+}
+
+bool8 RunScriptCommand(struct ScriptContext *ctx)
+{
+    if (ctx->mode == 0)
+        return FALSE;
+
+    switch (ctx->mode)
+    {
+    case 0:
+        return FALSE;
+    case 2:
+        if (ctx->nativePtr)
+        {
+            if (ctx->nativePtr() == TRUE)
+                ctx->mode = 1;
+            return TRUE;
+        }
+        ctx->mode = 1;
+    case 1:
+        while (1)
+        {
+            u8 cmdCode;
+            ScrCmdFunc *func;
+
+            if (!ctx->scriptPtr)
+            {
+                ctx->mode = 0;
+                return FALSE;
+            }
+
+            if (ctx->scriptPtr == gNullScriptPtr)
+            {
+                while (1)
+                    asm("svc 2"); // HALT
+            }
+
+            cmdCode = *(ctx->scriptPtr);
+            ctx->scriptPtr++;
+            func = &ctx->cmdTable[cmdCode];
+
+            if (func >= ctx->cmdTableEnd)
+            {
+                ctx->mode = 0;
+                return FALSE;
+            }
+
+            if ((*func)(ctx) == 1)
+                return TRUE;
+        }
+    }
+
+    return TRUE;
+}
+
+u8 ScriptPush(struct ScriptContext *ctx, const u8 *ptr)
+{
+    if (ctx->stackDepth + 1 >= 20)
+    {
+        return 1;
+    }
+    else
+    {
+        ctx->stack[ctx->stackDepth] = ptr;
+        ctx->stackDepth++;
+        return 0;
+    }
+}
+
+const u8 *ScriptPop(struct ScriptContext *ctx)
+{
+    if (ctx->stackDepth == 0)
+        return NULL;
+
+    ctx->stackDepth--;
+    return ctx->stack[ctx->stackDepth];
+}
+
+void ScriptJump(struct ScriptContext *ctx, u8 *ptr)
+{
+    ctx->scriptPtr = ptr;
+}
+
+void ScriptCall(struct ScriptContext *ctx, u8 *ptr)
+{
+    ScriptPush(ctx, ctx->scriptPtr);
+    ctx->scriptPtr = ptr;
+}
+
+void ScriptReturn(struct ScriptContext *ctx)
+{
+    ctx->scriptPtr = ScriptPop(ctx);
+}
+
+u16 ScriptReadHalfword(struct ScriptContext *ctx)
+{
+    u16 value = *(ctx->scriptPtr++);
+    value |= *(ctx->scriptPtr++) << 8;
+    return value;
+}
+
+u32 ScriptReadWord(struct ScriptContext *ctx)
+{
+    u32 value0 = *(ctx->scriptPtr++);
+    u32 value1 = *(ctx->scriptPtr++);
+    u32 value2 = *(ctx->scriptPtr++);
+    u32 value3 = *(ctx->scriptPtr++);
+    return (((((value3 << 8) + value2) << 8) + value1) << 8) + value0;
+}
+
+void ScriptContext2_Enable(void)
+{
+    sScriptContext2Enabled = TRUE;
+}
+
+void ScriptContext2_Disable(void)
+{
+    sScriptContext2Enabled = FALSE;
+}
+
+bool8 ScriptContext2_IsEnabled(void)
+{
+    return sScriptContext2Enabled;
+}
+
+bool8 ScriptContext1_IsScriptSetUp(void)
+{
+    if (sScriptContext1Status == 0)
+        return TRUE;
+    else
+        return FALSE;
+}
+
+void ScriptContext1_Init(void)
+{
+    InitScriptContext(&sScriptContext1, gScriptCmdTable, gScriptCmdTableEnd);
+    sScriptContext1Status = 2;
+}
+
+bool8 ScriptContext2_RunScript(void)
+{
+    if (sScriptContext1Status == 2)
+        return 0;
+
+    if (sScriptContext1Status == 1)
+        return 0;
+
+    ScriptContext2_Enable();
+
+    if (!RunScriptCommand(&sScriptContext1))
+    {
+        sScriptContext1Status = 2;
+        ScriptContext2_Disable();
+        return 0;
+    }
+
+    return 1;
+}
+
+void ScriptContext1_SetupScript(const u8 *ptr)
+{
+    InitScriptContext(&sScriptContext1, gScriptCmdTable, gScriptCmdTableEnd);
+    SetupBytecodeScript(&sScriptContext1, ptr);
+    ScriptContext2_Enable();
+    sScriptContext1Status = 0;
+}
+
+void ScriptContext1_Stop(void)
+{
+    sScriptContext1Status = 1;
+}
+
+void EnableBothScriptContexts(void)
+{
+    sScriptContext1Status = 0;
+    ScriptContext2_Enable();
+}
+
+void ScriptContext2_RunNewScript(const u8 *ptr)
+{
+    InitScriptContext(&sScriptContext2, &gScriptCmdTable, &gScriptCmdTableEnd);
+    SetupBytecodeScript(&sScriptContext2, ptr);
+    while (RunScriptCommand(&sScriptContext2) == TRUE);
+}
+
+u8 *mapheader_get_tagged_pointer(u8 tag)
+{
+    u8 *mapScripts = gMapHeader.mapScripts;
+
+    if (!mapScripts)
+        return NULL;
+
+    while (1)
+    {
+        if (!*mapScripts)
+            return NULL;
+        if (*mapScripts == tag)
+        {
+            mapScripts++;
+            return (u8 *)(mapScripts[0] + (mapScripts[1] << 8) + (mapScripts[2] << 16) + (mapScripts[3] << 24));
+        }
+        mapScripts += 5;
+    }
+}
+
+void mapheader_run_script_by_tag(u8 tag)
+{
+    u8 *ptr = mapheader_get_tagged_pointer(tag);
+    if (ptr)
+        ScriptContext2_RunNewScript(ptr);
+}
+
+u8 *mapheader_get_first_match_from_tagged_ptr_list(u8 tag)
+{
+    u8 *ptr = mapheader_get_tagged_pointer(tag);
+
+    if (!ptr)
+        return NULL;
+
+    while (1)
+    {
+        u16 varIndex1;
+        u16 varIndex2;
+        varIndex1 = ptr[0] | (ptr[1] << 8);
+        if (!varIndex1)
+            return NULL;
+        ptr += 2;
+        varIndex2 = ptr[0] | (ptr[1] << 8);
+        ptr += 2;
+        if (VarGet(varIndex1) == VarGet(varIndex2))
+            return (u8 *)(ptr[0] + (ptr[1] << 8) + (ptr[2] << 16) + (ptr[3] << 24));
+        ptr += 4;
+    }
+}
+
+void mapheader_run_script_with_tag_x1(void)
+{
+    mapheader_run_script_by_tag(1);
+}
+
+void mapheader_run_script_with_tag_x3(void)
+{
+    mapheader_run_script_by_tag(3);
+}
+
+void mapheader_run_script_with_tag_x5(void)
+{
+    mapheader_run_script_by_tag(5);
+}
+
+void mapheader_run_script_with_tag_x7(void)
+{
+    mapheader_run_script_by_tag(7);
+}
+
+void mapheader_run_script_with_tag_x6(void)
+{
+    mapheader_run_script_by_tag(6);
+}
+
+bool8 mapheader_run_first_tag2_script_list_match(void)
+{
+    u8 *ptr = mapheader_get_first_match_from_tagged_ptr_list(2);
+
+    if (!ptr)
+        return 0;
+
+    ScriptContext1_SetupScript(ptr);
+    return 1;
+}
+
+void mapheader_run_first_tag4_script_list_match(void)
+{
+    u8 *ptr = mapheader_get_first_match_from_tagged_ptr_list(4);
+    if (ptr)
+        ScriptContext2_RunNewScript(ptr);
+}
+
+u32 CalculateRamScriptChecksum(void)
+{
+    return CalcCRC16WithTable((u8*)(&gSaveBlock1Ptr->ramScript.data), sizeof(gSaveBlock1Ptr->ramScript.data));
+}
+
+void ClearRamScript(void)
+{
+    CpuFill32(0, &gSaveBlock1Ptr->ramScript, sizeof(struct RamScript));
+}
+
+bool8 InitRamScript(u8 *script, u16 scriptSize, u8 mapGroup, u8 mapNum, u8 objectId)
+{
+    struct RamScriptData *scriptData = &gSaveBlock1Ptr->ramScript.data;
+
+    ClearRamScript();
+
+    if (scriptSize > sizeof(scriptData->script))
+        return FALSE;
+
+    scriptData->magic = RAM_SCRIPT_MAGIC;
+    scriptData->mapGroup = mapGroup;
+    scriptData->mapNum = mapNum;
+    scriptData->objectId = objectId;
+    memcpy(scriptData->script, script, scriptSize);
+    gSaveBlock1Ptr->ramScript.checksum = CalculateRamScriptChecksum();
+    return TRUE;
+}
+
+u8 *GetRamScript(u8 objectId, u8 *script)
+{
+    struct RamScriptData *scriptData = &gSaveBlock1Ptr->ramScript.data;
+    gUnknown_020375C0 = NULL;
+    if (scriptData->magic != RAM_SCRIPT_MAGIC)
+        return script;
+    if (scriptData->mapGroup != gSaveBlock1Ptr->location.mapGroup)
+        return script;
+    if (scriptData->mapNum != gSaveBlock1Ptr->location.mapNum)
+        return script;
+    if (scriptData->objectId != objectId)
+        return script;
+    if (CalculateRamScriptChecksum() != gSaveBlock1Ptr->ramScript.checksum)
+    {
+        ClearRamScript();
+        return script;
+    }
+    else
+    {
+        gUnknown_020375C0 = script;
+        return scriptData->script;
+    }
+}
+
+bool32 sub_80991F8(void)
+{
+    struct RamScriptData *scriptData = &gSaveBlock1Ptr->ramScript.data;
+    if (scriptData->magic != RAM_SCRIPT_MAGIC)
+        return FALSE;
+    if (scriptData->mapGroup != 0xFF)
+        return FALSE;
+    if (scriptData->mapNum != 0xFF)
+        return FALSE;
+    if (scriptData->objectId != 0xFF)
+        return FALSE;
+    if (CalculateRamScriptChecksum() != gSaveBlock1Ptr->ramScript.checksum)
+        return FALSE;
+    return TRUE;
+}
+
+u8 *sub_8099244(void)
+{
+    struct RamScriptData *scriptData = &gSaveBlock1Ptr->ramScript.data;
+    if (!sub_801B27C())
+        return NULL;
+    if (scriptData->magic != RAM_SCRIPT_MAGIC)
+        return NULL;
+    if (scriptData->mapGroup != 0xFF)
+        return NULL;
+    if (scriptData->mapNum != 0xFF)
+        return NULL;
+    if (scriptData->objectId != 0xFF)
+        return NULL;
+    if (CalculateRamScriptChecksum() != gSaveBlock1Ptr->ramScript.checksum)
+    {
+        ClearRamScript();
+        return NULL;
+    }
+    else
+    {
+        return scriptData->script;
+    }
+}
+
+void sub_80992A0(u8 *script, u16 scriptSize)
+{
+    if (scriptSize > sizeof(gSaveBlock1Ptr->ramScript.data.script))
+        scriptSize = sizeof(gSaveBlock1Ptr->ramScript.data.script);
+    InitRamScript(script, scriptSize, 0xFF, 0xFF, 0xFF);
+}
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 000000000..27b7c5ee5
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,503 @@
+#include "global.h"
+#include "util.h"
+#include "sprite.h"
+
+const u32 gBitTable[] =
+{
+    1 << 0,
+    1 << 1,
+    1 << 2,
+    1 << 3,
+    1 << 4,
+    1 << 5,
+    1 << 6,
+    1 << 7,
+    1 << 8,
+    1 << 9,
+    1 << 10,
+    1 << 11,
+    1 << 12,
+    1 << 13,
+    1 << 14,
+    1 << 15,
+    1 << 16,
+    1 << 17,
+    1 << 18,
+    1 << 19,
+    1 << 20,
+    1 << 21,
+    1 << 22,
+    1 << 23,
+    1 << 24,
+    1 << 25,
+    1 << 26,
+    1 << 27,
+    1 << 28,
+    1 << 29,
+    1 << 30,
+    1 << 31,
+};
+
+static const struct SpriteTemplate sInvisibleSpriteTemplate =
+{
+    .tileTag = 0,
+    .paletteTag = 0,
+    .oam = &gDummyOamData,
+    .anims = gDummySpriteAnimTable,
+    .images = NULL,
+    .affineAnims = gDummySpriteAffineAnimTable,
+    .callback = SpriteCallbackDummy,
+};
+
+static const u8 sSpriteDimensions[3][4][2] =
+{
+    // square
+    {
+        {1, 1},
+        {2, 2},
+        {4, 4},
+        {8, 8},
+    },
+
+    // horizontal rectangle
+    {
+        {2, 1},
+        {4, 1},
+        {4, 2},
+        {8, 4},
+    },
+
+    // vertical rectangle
+    {
+        {1, 2},
+        {1, 4},
+        {2, 4},
+        {4, 8},
+    },
+};
+
+static const u16 sCrc16Table[] =
+{
+    0x0000, 0x1189, 0x2312, 0x329B, 0x4624, 0x57AD, 0x6536, 0x74BF,
+    0x8C48, 0x9DC1, 0xAF5A, 0xBED3, 0xCA6C, 0xDBE5, 0xE97E, 0xF8F7,
+    0x1081, 0x0108, 0x3393, 0x221A, 0x56A5, 0x472C, 0x75B7, 0x643E,
+    0x9CC9, 0x8D40, 0xBFDB, 0xAE52, 0xDAED, 0xCB64, 0xF9FF, 0xE876,
+    0x2102, 0x308B, 0x0210, 0x1399, 0x6726, 0x76AF, 0x4434, 0x55BD,
+    0xAD4A, 0xBCC3, 0x8E58, 0x9FD1, 0xEB6E, 0xFAE7, 0xC87C, 0xD9F5,
+    0x3183, 0x200A, 0x1291, 0x0318, 0x77A7, 0x662E, 0x54B5, 0x453C,
+    0xBDCB, 0xAC42, 0x9ED9, 0x8F50, 0xFBEF, 0xEA66, 0xD8FD, 0xC974,
+    0x4204, 0x538D, 0x6116, 0x709F, 0x0420, 0x15A9, 0x2732, 0x36BB,
+    0xCE4C, 0xDFC5, 0xED5E, 0xFCD7, 0x8868, 0x99E1, 0xAB7A, 0xBAF3,
+    0x5285, 0x430C, 0x7197, 0x601E, 0x14A1, 0x0528, 0x37B3, 0x263A,
+    0xDECD, 0xCF44, 0xFDDF, 0xEC56, 0x98E9, 0x8960, 0xBBFB, 0xAA72,
+    0x6306, 0x728F, 0x4014, 0x519D, 0x2522, 0x34AB, 0x0630, 0x17B9,
+    0xEF4E, 0xFEC7, 0xCC5C, 0xDDD5, 0xA96A, 0xB8E3, 0x8A78, 0x9BF1,
+    0x7387, 0x620E, 0x5095, 0x411C, 0x35A3, 0x242A, 0x16B1, 0x0738,
+    0xFFCF, 0xEE46, 0xDCDD, 0xCD54, 0xB9EB, 0xA862, 0x9AF9, 0x8B70,
+    0x8408, 0x9581, 0xA71A, 0xB693, 0xC22C, 0xD3A5, 0xE13E, 0xF0B7,
+    0x0840, 0x19C9, 0x2B52, 0x3ADB, 0x4E64, 0x5FED, 0x6D76, 0x7CFF,
+    0x9489, 0x8500, 0xB79B, 0xA612, 0xD2AD, 0xC324, 0xF1BF, 0xE036,
+    0x18C1, 0x0948, 0x3BD3, 0x2A5A, 0x5EE5, 0x4F6C, 0x7DF7, 0x6C7E,
+    0xA50A, 0xB483, 0x8618, 0x9791, 0xE32E, 0xF2A7, 0xC03C, 0xD1B5,
+    0x2942, 0x38CB, 0x0A50, 0x1BD9, 0x6F66, 0x7EEF, 0x4C74, 0x5DFD,
+    0xB58B, 0xA402, 0x9699, 0x8710, 0xF3AF, 0xE226, 0xD0BD, 0xC134,
+    0x39C3, 0x284A, 0x1AD1, 0x0B58, 0x7FE7, 0x6E6E, 0x5CF5, 0x4D7C,
+    0xC60C, 0xD785, 0xE51E, 0xF497, 0x8028, 0x91A1, 0xA33A, 0xB2B3,
+    0x4A44, 0x5BCD, 0x6956, 0x78DF, 0x0C60, 0x1DE9, 0x2F72, 0x3EFB,
+    0xD68D, 0xC704, 0xF59F, 0xE416, 0x90A9, 0x8120, 0xB3BB, 0xA232,
+    0x5AC5, 0x4B4C, 0x79D7, 0x685E, 0x1CE1, 0x0D68, 0x3FF3, 0x2E7A,
+    0xE70E, 0xF687, 0xC41C, 0xD595, 0xA12A, 0xB0A3, 0x8238, 0x93B1,
+    0x6B46, 0x7ACF, 0x4854, 0x59DD, 0x2D62, 0x3CEB, 0x0E70, 0x1FF9,
+    0xF78F, 0xE606, 0xD49D, 0xC514, 0xB1AB, 0xA022, 0x92B9, 0x8330,
+    0x7BC7, 0x6A4E, 0x58D5, 0x495C, 0x3DE3, 0x2C6A, 0x1EF1, 0x0F78,
+};
+
+const u8 gMiscBlank_Gfx[] = INCBIN_U8("graphics/interface/blank.4bpp"); // unused in Emerald
+
+u8 CreateInvisibleSpriteWithCallback(void (*callback)(struct Sprite *))
+{
+    u8 sprite = CreateSprite(&sInvisibleSpriteTemplate, 248, 168, 14);
+    gSprites[sprite].invisible = TRUE;
+    gSprites[sprite].callback = callback;
+    return sprite;
+}
+
+void StoreWordInTwoHalfwords(u16 *h, u32 w)
+{
+    h[0] = (u16)(w);
+    h[1] = (u16)(w >> 16);
+}
+
+void LoadWordFromTwoHalfwords(u16 *h, u32 *w)
+{
+    *w = h[0] | (s16)h[1] << 16;
+}
+
+void SetBgAffineStruct(struct BgAffineSrcData *src, u32 texX, u32 texY, s16 scrX, s16 scrY, s16 sx, s16 sy, u16 alpha)
+{
+    src->texX = texX;
+    src->texY = texY;
+    src->scrX = scrX;
+    src->scrY = scrY;
+    src->sx = sx;
+    src->sy = sy;
+    src->alpha = alpha;
+}
+
+void DoBgAffineSet(struct BgAffineDstData *dest, u32 texX, u32 texY, s16 scrX, s16 scrY, s16 sx, s16 sy, u16 alpha)
+{
+    struct BgAffineSrcData src;
+
+    SetBgAffineStruct(&src, texX, texY, scrX, scrY, sx, sy, alpha);
+    BgAffineSet(&src, dest, 1);
+}
+
+#ifdef NONMATCHING
+
+// Functionally equivalent.
+// Only the two yflip loops don't match.
+void CopySpriteTiles(u8 shape, u8 size, u8 *tiles, u16 *tilemap, u8 *output)
+{
+    u8 x, y;
+    s8 i, j;
+    u8 xflip[32];
+    u8 h = sSpriteDimensions[shape][size][1];
+    u8 w = sSpriteDimensions[shape][size][0];
+
+    for (y = 0; y < h; y++)
+    {
+        int filler = 32 - w;
+
+        for (x = 0; x < w; x++)
+        {
+            int tile = (*tilemap & 0x3ff) * 32;
+            int attr = *tilemap & 0xc00;
+
+            if (attr == 0)
+            {
+                void *src = tiles + tile;
+                void *dest = output;
+                int length = 32;
+                DmaCopy32(3, src, dest, length);
+            }
+            else if (attr == 0x800)  // yflip
+            {
+                for (i = 0; i < 8; i++)
+                {
+                    void *src = tiles;
+                    void *dest = output;
+                    int length = 4;
+                    // this is likely wrong, but makes it closer to matching
+                    src += tile + (7 - i) * 4;
+                    dest += i * 4;
+                    DmaCopy32(3, src, dest, length);
+                }
+            }
+            else  // xflip
+            {
+                for (i = 0; i < 8; i++)
+                {
+                    for (j = 0; j < 4; j++)
+                    {
+                        u8 i2 = i * 4;
+                        xflip[i2 + (3-j)] = (tiles[tile + i2 + j] & 0xf) << 4;
+                        xflip[i2 + (3-j)] |= tiles[tile + i2 + j] >> 4;
+                    }
+                }
+                if (*tilemap & 0x800)  // yflip
+                {
+                    for (i = 0; i < 8; i++)
+                    {
+                        void *src = xflip + (7-i) * 4;
+                        void *dest = output + i*4;
+                        int length = 4;
+                        DmaCopy32(3, src, dest, length);
+                    }
+                }
+                else
+                {
+                    void *src = xflip;
+                    void *dest = output;
+                    int length = 32;
+                    DmaCopy32(3, src, dest, length);
+                }
+            }
+            tilemap++;
+            output += 32;
+        }
+        tilemap += filler;
+    }
+}
+
+#else
+__attribute__((naked)) void CopySpriteTiles(u8 shape, u8 size, u8 *tiles, u16 *tilemap, u8 *output)
+{
+    asm("\n\
+        .syntax unified\n\
+        push {r4-r7,lr}\n\
+        mov r7, r10\n\
+        mov r6, r9\n\
+        mov r5, r8\n\
+        push {r5-r7}\n\
+        sub sp, 0x38\n\
+        str r2, [sp, 0x20]\n\
+        adds r4, r3, 0\n\
+        ldr r7, [sp, 0x58]\n\
+        lsls r0, 24\n\
+        lsls r1, 24\n\
+        ldr r2, =sSpriteDimensions\n\
+        lsrs r1, 23\n\
+        lsrs r0, 21\n\
+        adds r1, r0\n\
+        adds r0, r2, 0x1\n\
+        adds r0, r1, r0\n\
+        ldrb r0, [r0]\n\
+        str r0, [sp, 0x24]\n\
+        adds r1, r2\n\
+        ldrb r1, [r1]\n\
+        str r1, [sp, 0x28]\n\
+        movs r0, 0\n\
+        b _0806F88C\n\
+        .pool\n\
+    _0806F740:\n\
+        movs r5, 0\n\
+        adds r0, 0x1\n\
+        str r0, [sp, 0x30]\n\
+        b _0806F874\n\
+    _0806F748:\n\
+        ldrh r0, [r4]\n\
+        ldr r2, =0x000003ff\n\
+        adds r1, r2, 0\n\
+        ands r1, r0\n\
+        lsls r1, 5\n\
+        mov r8, r1\n\
+        movs r2, 0xC0\n\
+        lsls r2, 4\n\
+        adds r1, r2, 0\n\
+        ands r1, r0\n\
+        mov r2, sp\n\
+        strh r0, [r2, 0x34]\n\
+        cmp r1, 0\n\
+        bne _0806F788\n\
+        ldr r0, [sp, 0x20]\n\
+        add r0, r8\n\
+        adds r1, r7, 0\n\
+        ldr r2, =0x04000008\n\
+        bl CpuSet\n\
+        adds r4, 0x2\n\
+        str r4, [sp, 0x2C]\n\
+        adds r7, 0x20\n\
+        mov r10, r7\n\
+        adds r5, 0x1\n\
+        mov r9, r5\n\
+        b _0806F86A\n\
+        .pool\n\
+    _0806F788:\n\
+        movs r0, 0x80\n\
+        lsls r0, 4\n\
+        cmp r1, r0\n\
+        bne _0806F7CC\n\
+        movs r1, 0\n\
+        adds r4, 0x2\n\
+        str r4, [sp, 0x2C]\n\
+        movs r2, 0x20\n\
+        adds r2, r7\n\
+        mov r10, r2\n\
+        adds r5, 0x1\n\
+        mov r9, r5\n\
+    _0806F7A0:\n\
+        lsls r4, r1, 24\n\
+        asrs r4, 24\n\
+        movs r0, 0x7\n\
+        subs r0, r4\n\
+        lsls r0, 2\n\
+        add r0, r8\n\
+        ldr r1, [sp, 0x20]\n\
+        adds r0, r1, r0\n\
+        lsls r1, r4, 2\n\
+        adds r1, r7, r1\n\
+        ldr r2, =0x04000001\n\
+        bl CpuSet\n\
+        adds r4, 0x1\n\
+        lsls r4, 24\n\
+        lsrs r1, r4, 24\n\
+        asrs r4, 24\n\
+        cmp r4, 0x7\n\
+        ble _0806F7A0\n\
+        b _0806F86A\n\
+        .pool\n\
+    _0806F7CC:\n\
+        movs r1, 0\n\
+        adds r4, 0x2\n\
+        str r4, [sp, 0x2C]\n\
+        movs r2, 0x20\n\
+        adds r2, r7\n\
+        mov r10, r2\n\
+        adds r5, 0x1\n\
+        mov r9, r5\n\
+        movs r0, 0xF\n\
+        mov r12, r0\n\
+    _0806F7E0:\n\
+        movs r2, 0\n\
+        lsls r4, r1, 24\n\
+        lsls r0, r4, 2\n\
+        lsrs r0, 24\n\
+        adds r6, r0, 0x3\n\
+        mov r1, r8\n\
+        adds r5, r1, r0\n\
+    _0806F7EE:\n\
+        lsls r1, r2, 24\n\
+        asrs r1, 24\n\
+        subs r0, r6, r1\n\
+        mov r2, sp\n\
+        adds r3, r2, r0\n\
+        adds r0, r5, r1\n\
+        ldr r2, [sp, 0x20]\n\
+        adds r0, r2, r0\n\
+        ldrb r2, [r0]\n\
+        mov r0, r12\n\
+        ands r0, r2\n\
+        lsls r0, 4\n\
+        lsrs r2, 4\n\
+        orrs r0, r2\n\
+        strb r0, [r3]\n\
+        adds r1, 0x1\n\
+        lsls r1, 24\n\
+        lsrs r2, r1, 24\n\
+        asrs r1, 24\n\
+        cmp r1, 0x3\n\
+        ble _0806F7EE\n\
+        movs r1, 0x80\n\
+        lsls r1, 17\n\
+        adds r0, r4, r1\n\
+        lsrs r1, r0, 24\n\
+        asrs r0, 24\n\
+        cmp r0, 0x7\n\
+        ble _0806F7E0\n\
+        mov r2, sp\n\
+        ldrh r0, [r2, 0x34]\n\
+        movs r2, 0x80\n\
+        lsls r2, 4\n\
+        ands r0, r2\n\
+        cmp r0, 0\n\
+        beq _0806F860\n\
+        movs r1, 0\n\
+    _0806F836:\n\
+        lsls r4, r1, 24\n\
+        asrs r4, 24\n\
+        movs r0, 0x7\n\
+        subs r0, r4\n\
+        lsls r0, 2\n\
+        add r0, sp\n\
+        lsls r1, r4, 2\n\
+        adds r1, r7, r1\n\
+        ldr r2, =0x04000001\n\
+        bl CpuSet\n\
+        adds r4, 0x1\n\
+        lsls r4, 24\n\
+        lsrs r1, r4, 24\n\
+        asrs r4, 24\n\
+        cmp r4, 0x7\n\
+        ble _0806F836\n\
+        b _0806F86A\n\
+        .pool\n\
+    _0806F860:\n\
+        mov r0, sp\n\
+        adds r1, r7, 0\n\
+        ldr r2, =0x04000008\n\
+        bl CpuSet\n\
+    _0806F86A:\n\
+        ldr r4, [sp, 0x2C]\n\
+        mov r7, r10\n\
+        mov r1, r9\n\
+        lsls r0, r1, 24\n\
+        lsrs r5, r0, 24\n\
+    _0806F874:\n\
+        ldr r2, [sp, 0x28]\n\
+        cmp r5, r2\n\
+        bcs _0806F87C\n\
+        b _0806F748\n\
+    _0806F87C:\n\
+        movs r0, 0x20\n\
+        ldr r1, [sp, 0x28]\n\
+        subs r0, r1\n\
+        lsls r0, 1\n\
+        adds r4, r0\n\
+        ldr r2, [sp, 0x30]\n\
+        lsls r0, r2, 24\n\
+        lsrs r0, 24\n\
+    _0806F88C:\n\
+        ldr r1, [sp, 0x24]\n\
+        cmp r0, r1\n\
+        bcs _0806F894\n\
+        b _0806F740\n\
+    _0806F894:\n\
+        add sp, 0x38\n\
+        pop {r3-r5}\n\
+        mov r8, r3\n\
+        mov r9, r4\n\
+        mov r10, r5\n\
+        pop {r4-r7}\n\
+        pop {r0}\n\
+        bx r0\n\
+        .pool\n\
+        .syntax divided");
+}
+
+#endif // NONMATCHING
+
+int CountTrailingZeroBits(u32 value)
+{
+    u8 i;
+
+    for (i = 0; i < 32; i++)
+    {
+        if ((value & 1) == 0)
+            value >>= 1;
+        else
+            return i;
+    }
+    return 0;
+}
+
+u16 CalcCRC16(u8 *data, s32 length)
+{
+    u16 i, j;
+    u16 crc = 0x1121;
+
+    for (i = 0; i < length; i++)
+    {
+        crc ^= data[i];
+        for (j = 0; j < 8; j++)
+        {
+            if (crc & 1)
+                crc = (crc >> 1) ^ 0x8408;
+            else
+                crc >>= 1;
+        }
+    }
+    return ~crc;
+}
+
+u16 CalcCRC16WithTable(u8 *data, u32 length)
+{
+    u16 i;
+    u16 crc = 0x1121;
+    u8 byte;
+
+    for (i = 0; i < length; i++)
+    {
+        byte = crc >> 8;
+        crc ^= data[i];
+        crc = byte ^ sCrc16Table[(u8)crc];
+    }
+    return ~crc;
+}
+
+u32 CalcByteArraySum(const u8* data, u32 length)
+{
+    u32 sum, i;
+    for (sum = 0, i = 0; i < length; i++)
+        sum += data[i];
+    return sum;
+}