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De-duplicate and add safety check to ed.level reference

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Instead of repeating 'ed.level[curlevel]' (or even worse, you type in
that giant expression inside the brackets instead of reusing
'curlevel'), why not just type 'room'? As an added bonus, I added bounds
checks so 'room' is always guaranteed to point to an existing object.

There are some levels that index 'ed.level' out of bounds, and I'd like
to make their behavior properly defined instead of being undefined. One
of the things usually true about out-of-bounds rooms is that they're
always tiles2.png (that means an edlevelclass tileset that isn't 0),
because the chance of the memory location being exactly 0 is smaller
than it being nonzero. So the out-of-bounds room has tileset 1.
This commit is contained in:
Misa 2020-07-09 02:54:23 -07:00 committed by Ethan Lee
parent 729f24d732
commit 71a989707e
1 changed files with 33 additions and 19 deletions
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52
desktop_version/src/Map.cpp
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@ -1611,10 +1611,23 @@ void mapclass::loadlevel(int rx, int ry)
#endif
#if !defined(NO_CUSTOM_LEVELS)
case 12: //Custom level
int curlevel=(rx-100)+((ry-100)*ed.maxwidth);
const int curlevel = rx-100 + (ry-100) * ed.maxwidth;
const edlevelclass* room_ptr = NULL;
if (!INBOUNDS_ARR(curlevel, ed.level))
{
static edlevelclass blank;
blank.tileset = 1;
room_ptr = ␣
}
else
{
room_ptr = &ed.level[curlevel];
}
const edlevelclass& room = *room_ptr;
game.customcol=ed.getlevelcol(curlevel)+1;
obj.customplatformtile=game.customcol*12;
switch(ed.level[curlevel].tileset){
switch(room.tileset){
case 0: //Space Station
tileset = 0;
background = 1;
@ -1626,7 +1639,7 @@ void mapclass::loadlevel(int rx, int ry)
case 2: //Lab
tileset = 1;
background = 2;
graphics.rcol = ed.level[curlevel].tilecol;
graphics.rcol = room.tilecol;
break;
case 3: //Warp Zone/intermission
tileset = 1;
@ -1647,16 +1660,16 @@ void mapclass::loadlevel(int rx, int ry)
if(redrawbg){
graphics.backgrounddrawn = false;
}
if(ed.level[curlevel].warpdir>0){
if(ed.level[curlevel].warpdir==1){
if(room.warpdir>0){
if(room.warpdir==1){
warpx=true;
background=3;
graphics.rcol = ed.getwarpbackground(rx-100,ry-100);
}else if(ed.level[curlevel].warpdir==2){
}else if(room.warpdir==2){
warpy=true;
background=4;
graphics.rcol = ed.getwarpbackground(rx-100,ry-100);
}else if(ed.level[curlevel].warpdir==3){
}else if(room.warpdir==3){
warpx=true; warpy=true;
background = 5;
graphics.rcol = ed.getwarpbackground(rx-100,ry-100);
@ -1664,8 +1677,8 @@ void mapclass::loadlevel(int rx, int ry)
}
roomname="";
if(ed.level[curlevel].roomname!=""){
roomname=ed.level[curlevel].roomname;
if(room.roomname!=""){
roomname=room.roomname;
}
extrarow = 1;
const int* tmap = ed.loadlevel(rx, ry);
@ -1689,34 +1702,35 @@ void mapclass::loadlevel(int rx, int ry)
}
const int ex = (ent.x % 40) * 8;
const int ey = (ent.y % 30) * 8;
switch(ent.t){
case 1: //Enemies
int bx1, by1, bx2, by2;
bx1=ed.level[rx-100+((ry-100)*ed.maxwidth)].enemyx1;
by1=ed.level[rx-100+((ry-100)*ed.maxwidth)].enemyy1;
bx2=ed.level[rx-100+((ry-100)*ed.maxwidth)].enemyx2;
by2=ed.level[rx-100+((ry-100)*ed.maxwidth)].enemyy2;
bx1=room.enemyx1;
by1=room.enemyy1;
bx2=room.enemyx2;
by2=room.enemyy2;
if(warpx){ if(bx1==0 && bx2==320){ bx1=-100; bx2=420; } }
if(warpy){ if(by1==0 && by2==240){ by1=-100; by2=340; } }
obj.customenemy=ed.level[tsx+((ed.maxwidth)*tsy)].enemytype;
obj.customenemy=room.enemytype;
obj.createentity(ex, ey, 56,
ent.p1, 4, bx1, by1, bx2, by2);
break;
case 2: //Platforms and Threadmills
if(ent.p1<=4){
int bx1, by1, bx2, by2;
bx1=ed.level[rx-100+((ry-100)*ed.maxwidth)].platx1;
by1=ed.level[rx-100+((ry-100)*ed.maxwidth)].platy1;
bx2=ed.level[rx-100+((ry-100)*ed.maxwidth)].platx2;
by2=ed.level[rx-100+((ry-100)*ed.maxwidth)].platy2;
bx1=room.platx1;
by1=room.platy1;
bx2=room.platx2;
by2=room.platy2;
if(warpx){ if(bx1==0 && bx2==320){ bx1=-100; bx2=420; } }
if(warpy){ if(by1==0 && by2==240){ by1=-100; by2=340; } }
obj.createentity(ex, ey, 2,
ent.p1, ed.level[rx-100+((ry-100)*ed.mapwidth)].platv, bx1, by1, bx2, by2);
ent.p1, room.platv, bx1, by1, bx2, by2);
}else if(ent.p1 >= 5 && ent.p1 <= 8){ //Threadmill
obj.createentity(ex, ey, 2,
ent.p1 + 3, 4);