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- Do not crash when reading ATAG chunks on processors that don't like unaligned accesses. 

SVN r3991 (trunk)
This commit is contained in:
Randy Heit 2012-12-21 22:47:55 +00:00
parent e8731c7571
commit 2022d64ee2
1 changed files with 22 additions and 15 deletions
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37
src/p_acs.cpp
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@ -173,6 +173,27 @@ TArray<FString>
#define STRINGBUILDER_START(Builder) if (Builder.IsNotEmpty() || ACS_StringBuilderStack.Size()) { ACS_StringBuilderStack.Push(Builder); Builder = ""; }
#define STRINGBUILDER_FINISH(Builder) if (!ACS_StringBuilderStack.Pop(Builder)) { Builder = ""; }
//============================================================================
//
// uallong
//
// Read a possibly unaligned four-byte little endian integer from memory.
//
//============================================================================
#if defined(_M_IX86) || defined(_M_X64) || defined(__i386__)
inline int uallong(const int &foo)
{
return foo;
}
#else
inline int uallong(const int &foo)
{
const unsigned char *bar = (const unsigned char *)&foo;
return bar[0] | (bar[1] << 8) | (bar[2] << 16) | (bar[3] << 24);
}
#endif
//============================================================================
//
// ScriptPresentation
@ -1259,7 +1280,7 @@ FBehavior::FBehavior (int lumpnum, FileReader * fr, int len)
// First byte is version, it should be 0
if(*chunkData++ == 0)
{
int arraynum = MapVarStore[LittleLong(*(const DWORD*)(chunkData))];
int arraynum = MapVarStore[uallong(*(const int*)(chunkData))];
chunkData += 4;
if ((unsigned)arraynum < (unsigned)NumArrays)
{
@ -4010,20 +4031,6 @@ inline int getshort (int *&pc)
return res;
}
// Read a possibly unaligned four-byte little endian integer.
#if defined(_M_IX86) || defined(_M_X64) || defined(__i386__)
inline int uallong(int &foo)
{
return foo;
}
#else
inline int uallong(int &foo)
{
unsigned char *bar = (unsigned char *)&foo;
return bar[0] | (bar[1] << 8) | (bar[2] << 16) | (bar[3] << 24);
}
#endif
int DLevelScript::RunScript ()
{
DACSThinker *controller = DACSThinker::ActiveThinker;