Errors in dgnread.cpp

I have found two fatal errors in dgnread.cpp the first one will cause a crash

when there appears to be attributes on the tcb which inside the 'if'  

psElement->attr_bytes gets setup as a negative number which causes the

CPLMalloc to crash.  If you would like a copy of the dgn file let me know.

My fix was not to go inside the if( psElement->properties & DGNPF_ATTRIBUTES )

if the element is a tcb.

 

The next change was causing OGRLayer::GetFeature

to not return any features.  When the DGN Index was being built the

offset was being truncated to an invalid offest by the (unsigned char)

cast.

 

My envionment is Windows XP, Microsoft Visual Studio.Net 2003.

 

 

Thanks

Steve Brooks

 

 

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$ diff clean/dgnread.cpp modified/dgnread.cpp

1093c1093

< if( psElement->properties & DGNPF_ATTRIBUTES )

---

> if( psElement->properties & DGNPF_ATTRIBUTES && psElement->type != DGNT_TCB )

1621c1621

< psEI->offset = (unsigned char) nLastOffset;

---

> psEI->offset = (long) nLastOffset;

 

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