bool physics_file_is_m1(void)
{
bool m1_physics = false;
// check for M1 physics
OpenedFile PhysicsFile;
short SavedType, SavedError = get_game_error(&SavedType);
if (PhysicsFileSpec.Open(PhysicsFile))
{
uint32 tag = SDL_ReadBE32(PhysicsFile.GetRWops());
switch (tag)
{
case M1_MONSTER_PHYSICS_TAG:
case M1_EFFECTS_PHYSICS_TAG:
case M1_PROJECTILE_PHYSICS_TAG:
case M1_PHYSICS_PHYSICS_TAG:
case M1_WEAPONS_PHYSICS_TAG:
m1_physics = true;
break;
default:
break;
}
PhysicsFile.Close();
}
set_game_error(SavedType, SavedError);
return m1_physics;
}
SDL_Surface *WadImageCache::image_from_name(std::string& name) const
{
FileSpecifier file;
file.SetToImageCacheDir();
file.AddPart(name);
OpenedFile of;
if (!file.Open(of))
return NULL;
#ifdef HAVE_SDL_IMAGE
SDL_Surface *img = IMG_Load_RW(of.GetRWops(), 0);
#else
SDL_Surface *img = SDL_LoadBMP_RW(of.GetRWops(), 0);
#endif
return img;
}
// Determine file type
Typecode FileSpecifier::GetType()
{
// if there's an extension, assume it's correct
const char *extension = strrchr(GetPath(), '.');
if (extension) {
extension_mapping *mapping = extensions;
while (mapping->extension)
{
if (( mapping->case_sensitive && (strcmp(extension + 1, mapping->extension) == 0)) ||
(!mapping->case_sensitive && (strcasecmp(extension + 1, mapping->extension) == 0)))
{
return mapping->typecode;
}
++mapping;
}
}
// Open file
OpenedFile f;
if (!Open(f))
return _typecode_unknown;
SDL_RWops *p = f.GetRWops();
int32 file_length = 0;
f.GetLength(file_length);
// Check for Sounds file
{
f.SetPosition(0);
uint32 version = SDL_ReadBE32(p);
uint32 tag = SDL_ReadBE32(p);
if ((version == 0 || version == 1) && tag == FOUR_CHARS_TO_INT('s', 'n', 'd', '2'))
return _typecode_sounds;
}
// Check for Map/Physics file
{
f.SetPosition(0);
int version = SDL_ReadBE16(p);
int data_version = SDL_ReadBE16(p);
if ((version == 0 || version == 1 || version == 2 || version == 4) && (data_version == 0 || data_version == 1 || data_version == 2)) {
SDL_RWseek(p, 68, SEEK_CUR);
int32 directory_offset = SDL_ReadBE32(p);
if (directory_offset >= file_length)
goto not_map;
f.SetPosition(128);
uint32 tag = SDL_ReadBE32(p);
// ghs: I do not believe this list is comprehensive
// I think it's just what we've seen so far?
switch (tag) {
case LINE_TAG:
case POINT_TAG:
case SIDE_TAG:
return _typecode_scenario;
break;
case MONSTER_PHYSICS_TAG:
return _typecode_physics;
break;
}
}
not_map: ;
}
// Check for Shapes file
{
f.SetPosition(0);
for (int i=0; i<32; i++) {
uint32 status_flags = SDL_ReadBE32(p);
int32 offset = SDL_ReadBE32(p);
int32 length = SDL_ReadBE32(p);
int32 offset16 = SDL_ReadBE32(p);
int32 length16 = SDL_ReadBE32(p);
if (status_flags != 0
|| (offset != NONE && (offset >= file_length || offset + length > file_length))
|| (offset16 != NONE && (offset16 >= file_length || offset16 + length16 > file_length)))
goto not_shapes;
SDL_RWseek(p, 12, SEEK_CUR);
}
return _typecode_shapes;
not_shapes: ;
}
// Not identified
return _typecode_unknown;
}
