X-Git-Url: https://git.artsoft.org/?p=rocksndiamonds.git;a=blobdiff_plain;f=src%2Fgame_sp%2Ffile.c;h=f841cf208ae9b43e839f5696229c23bf90672e68;hp=7a0c2c87127196c573babc546a153170b350c216;hb=e51177796149f37de339bda83558c3c49758be93;hpb=07d1e990ebdd1e5eca3d310f8e9b9a3a8411a4dd

diff --git a/src/game_sp/file.c b/src/game_sp/file.c
index 7a0c2c87..f841cf20 100644
--- a/src/game_sp/file.c
+++ b/src/game_sp/file.c
@@ -7,14 +7,22 @@
 /* functions for loading Supaplex level                                      */
 /* ------------------------------------------------------------------------- */
 
+void setTapeInfoToDefaults_SP()
+{
+  native_sp_level.demo.is_available = FALSE;
+  native_sp_level.demo.length = 0;
+}
+
 void setLevelInfoToDefaults_SP()
 {
   LevelInfoType *header = &native_sp_level.header;
   char *empty_title = "-------- EMPTY --------";
   int i, x, y;
 
-  native_sp_level.width  = SP_PLAYFIELD_WIDTH;
-  native_sp_level.height = SP_PLAYFIELD_HEIGHT;
+  native_sp_level.game_sp = &game_sp;
+
+  native_sp_level.width  = SP_STD_PLAYFIELD_WIDTH;
+  native_sp_level.height = SP_STD_PLAYFIELD_HEIGHT;
 
   for (x = 0; x < native_sp_level.width; x++)
     for (y = 0; y < native_sp_level.height; y++)
@@ -43,14 +51,73 @@ void setLevelInfoToDefaults_SP()
     port->FreezeEnemies = 0;
   }
 
-  native_sp_level.demo.is_available = FALSE;
-  native_sp_level.demo.length = 0;
+  /* set raw header bytes (used for subsequent buffer zone) to "hardware" */
+  for (i = 0; i < SP_HEADER_SIZE; i++)
+    native_sp_level.header_raw_bytes[i] = 0x20;
+
+  setTapeInfoToDefaults_SP();
 }
 
 void copyInternalEngineVars_SP()
 {
+  char *preceding_playfield_memory[] =
+  {
+    "95 89 95 89 95 89 3b 8a  3b 8a 3b 8a 3b 8a 3b 8a",	// |......;.;.;.;.;.|
+    "3b 8a 3b 8a 3b 8a e8 8a  e8 8a e8 8a e8 8a e8 8a",	// |;.;.;.è.è.è.è.è.|
+    "e8 8a e8 8a e8 8a b1 8b  b1 8b b1 8b b1 8b b1 8b",	// |è.è.è.±.±.±.±.±.|
+    "b1 8b b1 8b b1 8b 85 8c  85 8c 85 8c 85 8c 85 8c",	// |±.±.±...........|
+    "85 8c 85 8c 85 8c 5b 8d  5b 8d 5b 8d 5b 8d 5b 8d",	// |......[.[.[.[.[.|
+    "5b 8d 5b 8d 5b 8d 06 8e  06 8e 06 8e 06 8e 06 8e",	// |[.[.[...........|
+    "06 8e 06 8e 06 8e ac 8e  ac 8e ac 8e ac 8e ac 8e",	// |......¬.¬.¬.¬.¬.|
+    "ac 8e ac 8e ac 8e 59 8f  59 8f 59 8f 59 8f 59 8f",	// |¬.¬.¬.Y.Y.Y.Y.Y.|
+    "59 8f 59 8f 59 8f 00 00  70 13 00 00 00 00 e8 17",	// |Y.Y.Y...p.....è.|
+    "00 00 00 00 00 00 69 38  00 00 00 00 00 00 00 00",	// |......i8........|
+    "00 00 00 00 00 00 00 00  d0 86 00 00 b2 34 00 00",	// |........Ð...²4..|
+    "00 00 00 00 00 00 8f 8b  1d 34 00 00 00 00 00 00",	// |.........4......|
+    "00 00 00 00 23 39 09 09  00 0c 00 08 00 58 00 00",	// |....#9.......X..|
+    "00 00 00 25 77 06 7f 00  00 00 01 00 00 00 00 00",	// |...%w...........|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 ec 06 26 05 00 00 00",	// |.........ì.&....|
+    "00 00 00 01 00 00 00 00  31 32 33 34 35 36 37 38",	// |........12345678|
+    "39 30 2d 00 08 00 51 57  45 52 54 59 55 49 4f 50",	// |90-...QWERTYUIOP|
+    "00 00 0a 00 41 53 44 46  47 48 4a 4b 4c 00 00 00",	// |....ASDFGHJKL...|
+    "00 00 5a 58 43 56 42 4e  4d 00 00 00 00 00 00 20",	// |..ZXCVBNM...... |
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 2e 00  1e 00 31 00 14 00 39 00",	// |..........1...9.|
+    "1f 00 14 00 18 00 ff ff  01 00 01 4c 45 56 45 4c",	// |......ÿÿ...LEVEL|
+    "53 2e 44 41 54 00 00 00  00 00 00 00 00 00 00 00",	// |S.DAT...........|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+    "00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00",	// |................|
+
+    NULL
+  };
+  int preceding_buffer_size = 0;
+  int count;
   int i, x, y;
 
+  for (i = 0; preceding_playfield_memory[i] != NULL; i++)
+    preceding_buffer_size += 8;		/* eight 16-bit integer values */
+
+  /* needed for engine snapshots */
+  game_sp.preceding_buffer_size = preceding_buffer_size;
+
   LInfo = native_sp_level.header;
 
   FieldWidth  = native_sp_level.width;
@@ -60,63 +127,94 @@ void copyInternalEngineVars_SP()
   FieldMax = (FieldWidth * FieldHeight) + HeaderSize - 1;
   LevelMax = (FieldWidth * FieldHeight) - 1;
 
-  FileMax = FieldMax + native_sp_level.demo.length;
+  /* (add one byte for the level number stored as first byte of demo data) */
+  FileMax = FieldMax + native_sp_level.demo.length + 1;
 
-  PlayField8 = REDIM_1D(sizeof(byte), 0, FileMax + 1 - 1);
-  DisPlayField = REDIM_1D(sizeof(byte), 0, FieldMax + 1 - 1);
-  PlayField16 = REDIM_1D(sizeof(int), -FieldWidth, FieldMax);
+#if 0
+  PlayField8 = REDIM_1D(sizeof(byte), 0, FileMax);
+  DisPlayField = REDIM_1D(sizeof(byte), 0, FieldMax);
+  PlayField16 = REDIM_1D(sizeof(int), -preceding_buffer_size, FieldMax);
+#endif
 
-  for (i = 0, y = 0; y < native_sp_level.height; y++)
+  count = 0;
+  for (i = 0; preceding_playfield_memory[i] != NULL; i++)
   {
-    for (x = 0; x < native_sp_level.width; x++)
+    char *s = preceding_playfield_memory[i];
+    boolean hi_byte = FALSE;	/* little endian data => start with low byte */
+
+    while (s[0] != '\0' && s[1] != '\0')
     {
-      PlayField8[i] = native_sp_level.playfield[x][y];
+      int hi_nibble = s[0] - (s[0] > '9' ? 'a' - 10 : '0');
+      int lo_nibble = s[1] - (s[1] > '9' ? 'a' - 10 : '0');
+      int byte = (hi_nibble << 4) | lo_nibble;
 
-      PlayField16[i] = PlayField8[i];
-      DisPlayField[i] = PlayField8[i];
-      PlayField8[i] = 0;
+      if (hi_byte)
+	byte <<= 8;
 
-      i++;
+      PlayField16[-preceding_buffer_size + count] |= byte;
+
+      if (hi_byte)
+	count++;
+
+      hi_byte = !hi_byte;
+
+      s += 2;
+
+      while (*s == ' ')
+	s++;
     }
   }
 
+  count = 0;
+  for (y = 0; y < native_sp_level.height; y++)
+    for (x = 0; x < native_sp_level.width; x++)
+      PlayField8[count++] = native_sp_level.playfield[x][y];
+
+  /* add raw header bytes to subsequent playfield buffer zone */
+  for (i = 0; i < SP_HEADER_SIZE; i++)
+    PlayField8[count++] = native_sp_level.header_raw_bytes[i];
+
+  for (i = 0; i < count; i++)
+  {
+    PlayField16[i] = PlayField8[i];
+    DisPlayField[i] = PlayField8[i];
+    PlayField8[i] = 0;
+  }
+
   if (native_sp_level.demo.is_available)
   {
     DemoAvailable = True;
 
+#if 0
+    /* !!! NEVER USED !!! */
     PlayField8[FieldMax + 1] = native_sp_level.demo.level_nr;
 
+    /* !!! NEVER USED !!! */
     for (i = 0; i < native_sp_level.demo.length; i++)
-      PlayField8[FieldMax + i + 2] = native_sp_level.demo.data[i];
+      PlayField8[FieldMax + 2 + i] = native_sp_level.demo.data[i];
+#endif
   }
 
+#if 0
   AnimationPosTable = REDIM_1D(sizeof(int), 0, LevelMax - 2 * FieldWidth);
   AnimationSubTable = REDIM_1D(sizeof(byte), 0, LevelMax - 2 * FieldWidth);
-  TerminalState = REDIM_1D(sizeof(byte), 0, FieldMax + 1 - 1);
-
-  DemoPointer = FieldMax + 1;
-  DemoOffset = DemoPointer;
-  DemoKeyRepeatCounter = 0;
+  TerminalState = REDIM_1D(sizeof(byte), 0, FieldMax);
+#endif
 
   GravityFlag = LInfo.InitialGravity;
   FreezeZonks = LInfo.InitialFreezeZonks;
 
 #if 1
-  /* set by main game tape code directly */
+  /* this is set by main game tape code to native random generator directly */
 #else
-
-#if 1
-  printf("::: file.c: copyInternalEngineVars_SP(): RandomSeed = LInfo.DemoRandomSeed\n");
-#endif
-
   RandomSeed = LInfo.DemoRandomSeed;
-
 #endif
 
   LevelLoaded = True;
 }
 
-static void LoadNativeLevelFromFileStream_SP(FILE *file, boolean demo_available)
+static void LoadNativeLevelFromFileStream_SP(FILE *file, int width, int height,
+					     boolean demo_available)
 {
   LevelInfoType *header = &native_sp_level.header;
   int i, x, y;
@@ -124,13 +222,22 @@ static void LoadNativeLevelFromFileStream_SP(FILE *file, boolean demo_available)
   /* for details of the Supaplex level format, see Herman Perk's Supaplex
      documentation file "SPFIX63.DOC" from his Supaplex "SpeedFix" package */
 
-  native_sp_level.width  = SP_PLAYFIELD_WIDTH;
-  native_sp_level.height = SP_PLAYFIELD_HEIGHT;
+  native_sp_level.width  = MIN(width,  SP_MAX_PLAYFIELD_WIDTH);
+  native_sp_level.height = MIN(height, SP_MAX_PLAYFIELD_HEIGHT);
 
   /* read level playfield (width * height == 60 * 24 tiles == 1440 bytes) */
-  for (y = 0; y < native_sp_level.height; y++)
-    for (x = 0; x < native_sp_level.width; x++)
-      native_sp_level.playfield[x][y] = getFile8Bit(file);
+  /* (MPX levels may have non-standard playfield size -- check max. size) */
+  for (y = 0; y < height; y++)
+  {
+    for (x = 0; x < width; x++)
+    {
+      byte element = getFile8Bit(file);
+
+      if (x < SP_MAX_PLAYFIELD_WIDTH &&
+	  y < SP_MAX_PLAYFIELD_HEIGHT)
+	native_sp_level.playfield[x][y] = element;
+    }
+  }
 
   /* read level header (96 bytes) */
 
@@ -157,10 +264,6 @@ static void LoadNativeLevelFromFileStream_SP(FILE *file, boolean demo_available)
   /* number of special ("gravity") port entries below (maximum 10 allowed) */
   header->SpecialPortCount = getFile8Bit(file);
 
-#if 0
-  printf("::: num_special_ports == %d\n", header->SpecialPortCount);
-#endif
-
   /* database of properties of up to 10 special ports (6 bytes per port) */
   for (i = 0; i < SP_MAX_SPECIAL_PORTS; i++)
   {
@@ -173,16 +276,6 @@ static void LoadNativeLevelFromFileStream_SP(FILE *file, boolean demo_available)
        which is 2 bytes per tile) */
     port->PortLocation = getFile16BitBE(file);		/* yes, big endian */
 
-#if 0
-    {
-      int port_x = (port->PortLocation / 2) % SP_PLAYFIELD_WIDTH;
-      int port_y = (port->PortLocation / 2) / SP_PLAYFIELD_WIDTH;
-
-      printf("::: %d: port_location == %d => (%d, %d)\n",
-	     i, port->PortLocation, port_x, port_y);
-    }
-#endif
-
     /* change gravity: 1 == "turn on", anything else (0) == "turn off" */
     port->Gravity = getFile8Bit(file);
 
@@ -204,10 +297,6 @@ static void LoadNativeLevelFromFileStream_SP(FILE *file, boolean demo_available)
   /* random seed used for recorded demos */
   header->DemoRandomSeed = getFile16BitLE(file);	/* yes, little endian */
 
-#if 0
-  printf("::: file.c: DemoRandomSeed == %d\n", header->DemoRandomSeed);
-#endif
-
   /* auto-determine number of infotrons if it was stored as "0" -- see above */
   if (header->InfotronsNeeded == 0)
   {
@@ -219,7 +308,13 @@ static void LoadNativeLevelFromFileStream_SP(FILE *file, boolean demo_available)
     header->InfotronsNeeded &= 0xff;	/* only use low byte -- see above */
   }
 
-  /* also load demo tape, if available */
+  /* read raw level header bytes (96 bytes) */
+
+  fseek(file, -(SP_HEADER_SIZE), SEEK_CUR);	/* rewind file */
+  for (i = 0; i < SP_HEADER_SIZE; i++)
+    native_sp_level.header_raw_bytes[i] = fgetc(file);
+
+  /* also load demo tape, if available (only in single level files) */
 
   if (demo_available)
   {
@@ -248,7 +343,7 @@ static void LoadNativeLevelFromFileStream_SP(FILE *file, boolean demo_available)
   }
 }
 
-boolean LoadNativeLevel_SP(char *filename, int pos)
+boolean LoadNativeLevel_SP(char *filename, int level_pos)
 {
   FILE *file;
   int i, l, x, y;
@@ -260,8 +355,13 @@ boolean LoadNativeLevel_SP(char *filename, int pos)
   boolean reading_multipart_level = FALSE;
   boolean use_empty_level = FALSE;
   LevelInfoType *header = &native_sp_level.header;
-  boolean demo_available = (strSuffix(filename, ".sp") ||
-			    strSuffix(filename, ".SP"));
+  boolean is_single_level_file = (strSuffixLower(filename, ".sp") ||
+				  strSuffixLower(filename, ".mpx"));
+  boolean demo_available = is_single_level_file;
+  boolean is_mpx_file = strSuffixLower(filename, ".mpx");
+  int file_seek_pos = level_pos * SP_STD_LEVEL_SIZE;
+  int level_width  = SP_STD_PLAYFIELD_WIDTH;
+  int level_height = SP_STD_PLAYFIELD_HEIGHT;
 
   /* always start with reliable default values */
   setLevelInfoToDefaults_SP();
@@ -269,13 +369,76 @@ boolean LoadNativeLevel_SP(char *filename, int pos)
 
   if (!(file = fopen(filename, MODE_READ)))
   {
-    Error(ERR_WARN, "cannot open level '%s' -- using empty level", filename);
+    Error(ERR_WARN, "cannot open file '%s' -- using empty level", filename);
 
     return FALSE;
   }
 
+  if (is_mpx_file)
+  {
+    char mpx_chunk_name[4 + 1];
+    int mpx_version;
+    int mpx_level_count;
+    LevelDescriptor *mpx_level_desc;
+
+    getFileChunkBE(file, mpx_chunk_name, NULL);
+
+    if (!strEqual(mpx_chunk_name, "MPX "))
+    {
+      Error(ERR_WARN, "cannot find MPX ID in file '%s' -- using empty level",
+	    filename);
+
+      return FALSE;
+    }
+
+    mpx_version = getFile16BitLE(file);
+
+    if (mpx_version != 1)
+    {
+      Error(ERR_WARN, "unknown MPX version in file '%s' -- using empty level",
+	    filename);
+
+      return FALSE;
+    }
+
+    mpx_level_count = getFile16BitLE(file);
+
+    if (mpx_level_count < 1)
+    {
+      Error(ERR_WARN, "no MPX levels found in file '%s' -- using empty level",
+	    filename);
+
+      return FALSE;
+    }
+
+    if (level_pos >= mpx_level_count)
+    {
+      Error(ERR_WARN, "MPX level not found in file '%s' -- using empty level",
+	    filename);
+
+      return FALSE;
+    }
+
+    mpx_level_desc = checked_calloc(mpx_level_count * sizeof(LevelDescriptor));
+
+    for (i = 0; i < mpx_level_count; i++)
+    {
+      LevelDescriptor *ldesc = &mpx_level_desc[i];
+
+      ldesc->Width  = getFile16BitLE(file);
+      ldesc->Height = getFile16BitLE(file);
+      ldesc->OffSet = getFile32BitLE(file);	/* starts with 1, not with 0 */
+      ldesc->Size   = getFile32BitLE(file);
+    }
+
+    level_width  = mpx_level_desc[level_pos].Width;
+    level_height = mpx_level_desc[level_pos].Height;
+
+    file_seek_pos = mpx_level_desc[level_pos].OffSet - 1;
+  }
+
   /* position file stream to the requested level (in case of level package) */
-  if (fseek(file, pos * SP_LEVEL_SIZE, SEEK_SET) != 0)
+  if (fseek(file, file_seek_pos, SEEK_SET) != 0)
   {
     Error(ERR_WARN, "cannot fseek in file '%s' -- using empty level", filename);
 
@@ -290,12 +453,16 @@ boolean LoadNativeLevel_SP(char *filename, int pos)
      of the level name, the multi-part level consists of only horizontal or
      vertical parts */
 
-  for (l = pos; l < SP_NUM_LEVELS_PER_PACKAGE; l++)
+  for (l = level_pos; l < SP_NUM_LEVELS_PER_PACKAGE; l++)
   {
-    LoadNativeLevelFromFileStream_SP(file, demo_available);
+    LoadNativeLevelFromFileStream_SP(file, level_width, level_height,
+				     demo_available);
 
     /* check if this level is a part of a bigger multi-part level */
 
+    if (is_single_level_file)
+      break;
+
     name_first = header->LevelTitle[0];
     name_last  = header->LevelTitle[SP_LEVEL_NAME_LEN - 1];
 
@@ -307,13 +474,20 @@ boolean LoadNativeLevel_SP(char *filename, int pos)
       ((name_first == '?' || name_first == '1') &&
        (name_last  == '?' || name_last  == '1'));
 
-    /* correct leading multipart level meta information in level name */
-    for (i = 0; i < SP_LEVEL_NAME_LEN && header->LevelTitle[i] == name_first; i++)
-      header->LevelTitle[i] = '-';
-
-    /* correct trailing multipart level meta information in level name */
-    for (i = SP_LEVEL_NAME_LEN - 1; i >= 0 && header->LevelTitle[i] == name_last; i--)
-      header->LevelTitle[i] = '-';
+    if (is_multipart_level)
+    {
+      /* correct leading multipart level meta information in level name */
+      for (i = 0;
+	   i < SP_LEVEL_NAME_LEN && header->LevelTitle[i] == name_first;
+	   i++)
+	header->LevelTitle[i] = '-';
+
+      /* correct trailing multipart level meta information in level name */
+      for (i = SP_LEVEL_NAME_LEN - 1;
+	   i >= 0 && header->LevelTitle[i] == name_last;
+	   i--)
+	header->LevelTitle[i] = '-';
+    }
 
     /* ---------- check for normal single level ---------- */
 
@@ -380,8 +554,8 @@ boolean LoadNativeLevel_SP(char *filename, int pos)
 	   multipart_xpos, multipart_ypos, multipart_level.header.LevelTitle);
 #endif
 
-    if (multipart_xpos * SP_PLAYFIELD_WIDTH  > SP_MAX_PLAYFIELD_WIDTH ||
-	multipart_ypos * SP_PLAYFIELD_HEIGHT > SP_MAX_PLAYFIELD_HEIGHT)
+    if (multipart_xpos * SP_STD_PLAYFIELD_WIDTH  > SP_MAX_PLAYFIELD_WIDTH ||
+	multipart_ypos * SP_STD_PLAYFIELD_HEIGHT > SP_MAX_PLAYFIELD_HEIGHT)
     {
       Error(ERR_WARN, "multi-part level is too big -- ignoring part of it");
 
@@ -389,17 +563,17 @@ boolean LoadNativeLevel_SP(char *filename, int pos)
     }
 
     multipart_level.width  = MAX(multipart_level.width,
-				 multipart_xpos * SP_PLAYFIELD_WIDTH);
+				 multipart_xpos * SP_STD_PLAYFIELD_WIDTH);
     multipart_level.height = MAX(multipart_level.height,
-				 multipart_ypos * SP_PLAYFIELD_HEIGHT);
+				 multipart_ypos * SP_STD_PLAYFIELD_HEIGHT);
 
     /* copy level part at the right position of multi-part level */
-    for (x = 0; x < SP_PLAYFIELD_WIDTH; x++)
+    for (x = 0; x < SP_STD_PLAYFIELD_WIDTH; x++)
     {
-      for (y = 0; y < SP_PLAYFIELD_HEIGHT; y++)
+      for (y = 0; y < SP_STD_PLAYFIELD_HEIGHT; y++)
       {
-	int start_x = (multipart_xpos - 1) * SP_PLAYFIELD_WIDTH;
-	int start_y = (multipart_ypos - 1) * SP_PLAYFIELD_HEIGHT;
+	int start_x = (multipart_xpos - 1) * SP_STD_PLAYFIELD_WIDTH;
+	int start_y = (multipart_ypos - 1) * SP_STD_PLAYFIELD_HEIGHT;
 
 	multipart_level.playfield[start_x + x][start_y + y] =
 	  native_sp_level.playfield[x][y];
@@ -423,3 +597,64 @@ boolean LoadNativeLevel_SP(char *filename, int pos)
 
   return TRUE;
 }
+
+void SaveNativeLevel_SP(char *filename)
+{
+  LevelInfoType *header = &native_sp_level.header;
+  FILE *file;
+  int i, x, y;
+
+  if (!(file = fopen(filename, MODE_WRITE)))
+  {
+    Error(ERR_WARN, "cannot save native level file '%s'", filename);
+
+    return;
+  }
+
+  /* write level playfield (width * height == 60 * 24 tiles == 1440 bytes) */
+  for (y = 0; y < native_sp_level.height; y++)
+    for (x = 0; x < native_sp_level.width; x++)
+      putFile8Bit(file, native_sp_level.playfield[x][y]);
+
+  /* write level header (96 bytes) */
+
+  WriteUnusedBytesToFile(file, 4);
+
+  putFile8Bit(file, header->InitialGravity);
+  putFile8Bit(file, header->Version);
+
+  for (i = 0; i < SP_LEVEL_NAME_LEN; i++)
+    putFile8Bit(file, header->LevelTitle[i]);
+
+  putFile8Bit(file, header->InitialFreezeZonks);
+  putFile8Bit(file, header->InfotronsNeeded);
+  putFile8Bit(file, header->SpecialPortCount);
+
+  for (i = 0; i < SP_MAX_SPECIAL_PORTS; i++)
+  {
+    SpecialPortType *port = &header->SpecialPort[i];
+
+    putFile16BitBE(file, port->PortLocation);
+    putFile8Bit(file, port->Gravity);
+    putFile8Bit(file, port->FreezeZonks);
+    putFile8Bit(file, port->FreezeEnemies);
+
+    WriteUnusedBytesToFile(file, 1);
+  }
+
+  putFile8Bit(file, header->SpeedByte);
+  putFile8Bit(file, header->CheckSumByte);
+  putFile16BitLE(file, header->DemoRandomSeed);
+
+  /* also save demo tape, if available */
+
+  if (native_sp_level.demo.is_available)
+  {
+    putFile8Bit(file, native_sp_level.demo.level_nr);
+
+    for (i = 0; i < native_sp_level.demo.length; i++)
+      putFile8Bit(file, native_sp_level.demo.data[i]);
+  }
+
+  fclose(file);
+}