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- made GL nodes loader more resilient to broken data

Browse source 
https://forum.zdoom.org/viewtopic.php?t=66086
This commit is contained in:
alexey.lysiuk 2019-10-12 12:41:14 +03:00
parent 09dcb247cf
commit b40e0ae38d
1 changed files with 68 additions and 17 deletions
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83
src/maploader/glnodes.cpp
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@ -206,6 +206,8 @@ bool MapLoader::LoadGLVertexes(FileReader &lump)
lump.Seek(0, FileReader::SeekSet);
auto glbuf = lump.Read();
auto gllen=lump.GetLength();
if (gllen < 4)
return false;
auto gldata = glbuf.Data();
if (*(int *)gldata == gNd5)
@ -279,28 +281,51 @@ bool MapLoader::LoadGLSegs(FileReader &lump)
lump.Seek(0, FileReader::SeekSet);
auto data = lump.Read();
int numsegs = (int)lump.GetLength();
if (numsegs < 4)
return false;
auto &segs = Level->segs;
const unsigned numverts = Level->vertexes.Size();
const unsigned numlines = Level->lines.Size();
if (!format5 && memcmp(data.Data(), "gNd3", 4))
{
numsegs/=sizeof(glseg_t);
Level->segs.Alloc(numsegs);
segs.Alloc(numsegs);
memset(&segs[0],0,sizeof(seg_t)*numsegs);
glseg_t * ml = (glseg_t*)data.Data();
for(i = 0; i < numsegs; i++)
{
// check for gl-vertices
segs[i].v1 = &Level->vertexes[checkGLVertex(LittleShort(ml->v1))];
segs[i].v2 = &Level->vertexes[checkGLVertex(LittleShort(ml->v2))];
segs[i].PartnerSeg = ml->partner == 0xFFFF ? nullptr : &segs[LittleShort(ml->partner)];
const unsigned v1idx = checkGLVertex(LittleShort(ml->v1));
if (v1idx >= numverts)
return false;
segs[i].v1 = &Level->vertexes[v1idx];
const unsigned v2idx = checkGLVertex(LittleShort(ml->v2));
if (v2idx >= numverts)
return false;
segs[i].v2 = &Level->vertexes[v2idx];
const int partner = LittleShort(ml->partner);
if (partner == 0xFFFF)
segs[i].PartnerSeg = nullptr;
else if (partner >= numsegs)
return false;
else
segs[i].PartnerSeg = &segs[partner];
if(ml->linedef != 0xffff)
{
ldef = &Level->lines[LittleShort(ml->linedef)];
const unsigned lineidx = LittleShort(ml->linedef);
if (lineidx >= numlines)
return false;
ldef = &Level->lines[lineidx];
segs[i].linedef = ldef;
ml->side=LittleShort(ml->side);
if (ml->side > 1)
return false;
segs[i].sidedef = ldef->sidedef[ml->side];
if (ldef->sidedef[ml->side] != nullptr)
{
@ -336,25 +361,42 @@ bool MapLoader::LoadGLSegs(FileReader &lump)
{
if (!format5) numsegs-=4;
numsegs/=sizeof(glseg3_t);
Level->segs.Alloc(numsegs);
segs.Alloc(numsegs);
memset(&segs[0],0,sizeof(seg_t)*numsegs);
glseg3_t * ml = (glseg3_t*)(data.Data() + (format5? 0:4));
for(i = 0; i < numsegs; i++)
{ // check for gl-vertices
segs[i].v1 = &Level->vertexes[checkGLVertex3(LittleLong(ml->v1))];
segs[i].v2 = &Level->vertexes[checkGLVertex3(LittleLong(ml->v2))];
const unsigned v1idx = checkGLVertex3(LittleLong(ml->v1));
if (v1idx >= numverts)
return false;
segs[i].v1 = &Level->vertexes[v1idx];
const unsigned v2idx = checkGLVertex3(LittleLong(ml->v2));
if (v2idx >= numverts)
return false;
segs[i].v2 = &Level->vertexes[v2idx];
const uint32_t partner = LittleLong(ml->partner);
segs[i].PartnerSeg = UINT_MAX == partner ? nullptr : &segs[partner];
if (partner == UINT_MAX)
segs[i].PartnerSeg = nullptr;
else if (partner >= (uint32_t)numsegs)
return false;
else
segs[i].PartnerSeg = &segs[partner];
if(ml->linedef != 0xffff) // skip minisegs
{
ldef = &Level->lines[LittleLong(ml->linedef)];
const unsigned lineidx = LittleShort(ml->linedef);
if (lineidx >= numlines)
return false;
ldef = &Level->lines[lineidx];
segs[i].linedef = ldef;
ml->side=LittleShort(ml->side);
if (ml->side > 1)
return false;
segs[i].sidedef = ldef->sidedef[ml->side];
if (ldef->sidedef[ml->side] != nullptr)
{
@ -400,8 +442,11 @@ bool MapLoader::LoadGLSubsectors(FileReader &lump)
int i;
int numsubsectors = (int)lump.GetLength();
if (numsubsectors < 4)
return false;
lump.Seek(0, FileReader::SeekSet);
auto datab = lump.Read();
const unsigned numsegs = Level->segs.Size();
if (numsubsectors == 0)
{
@ -419,12 +464,15 @@ bool MapLoader::LoadGLSubsectors(FileReader &lump)
for (i=0; i<numsubsectors; i++)
{
subsectors[i].numlines = LittleShort(data[i].numsegs );
subsectors[i].firstline = &Level->segs[LittleShort(data[i].firstseg)];
if (subsectors[i].numlines == 0)
{
return false;
}
const unsigned firstseg = LittleShort(data[i].firstseg);
if (firstseg >= numsegs)
return false;
subsectors[i].firstline = &Level->segs[firstseg];
}
}
else
@ -438,12 +486,15 @@ bool MapLoader::LoadGLSubsectors(FileReader &lump)
for (i=0; i<numsubsectors; i++)
{
subsectors[i].numlines = LittleLong(data[i].numsegs );
subsectors[i].firstline = &Level->segs[LittleLong(data[i].firstseg)];
if (subsectors[i].numlines == 0)
{
return false;
}
const unsigned firstseg = LittleLong(data[i].firstseg);
if (firstseg >= numsegs)
return false;
subsectors[i].firstline = &Level->segs[firstseg];
}
}
@ -774,7 +825,7 @@ bool MapLoader::LoadGLNodes(MapData * map)
const int idcheck1b = MAKE_ID('X','G','L','N');
const int idcheck2b = MAKE_ID('X','G','L','2');
const int idcheck3b = MAKE_ID('X','G','L','3');
int id;
int id = 0;
auto &file = map->Reader(ML_GLZNODES);
file.Read (&id, 4);