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Fix crash when trying to open unreadable IWAD files

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Cacodemon345 2021-02-12 11:52:26 +06:00 committed by Christoph Oelckers
parent 0a30c19138
commit 349a2e9235
3 changed files with 20 additions and 2 deletions
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17
src/common/utility/cmdlib.cpp
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@ -165,6 +165,23 @@ bool FileExists (const char *filename)
return res && !isdir;
}
//==========================================================================
//
// FileReadable
//
// Returns true if the file can be read.
//
//==========================================================================
bool FileReadable(const char *filename)
{
#ifndef _WIN32
return access (filename, R_OK) == 0;
#else
return _access (filename, 4) == 0;
#endif
}
//==========================================================================
//
// DirExists

1
src/common/utility/cmdlib.h
View file

@ -33,6 +33,7 @@ char(&_ArraySizeHelper(T(&array)[N]))[N];
#define myoffsetof(type,identifier) ((size_t)&((type *)alignof(type))->identifier - alignof(type))
bool FileExists (const char *filename);
bool FileReadable (const char *filename);
bool DirExists(const char *filename);
bool DirEntryExists (const char *pathname, bool *isdir = nullptr);
bool GetFileInfo(const char* pathname, size_t* size, time_t* time);

4
src/d_iwad.cpp
View file

@ -577,10 +577,10 @@ int FIWadManager::IdentifyVersion (TArray<FString> &wadfiles, const char *iwad,
// -iwad not found or not specified. Revert back to standard behavior.
if (mFoundWads.Size() == numFoundWads) iwadparm = nullptr;
// Check for symbolic links leading to non-existent files.
// Check for symbolic links leading to non-existent files and for files that are unreadable.
for (unsigned int i = 0; i < mFoundWads.Size(); i++)
{
if (!FileExists(mFoundWads[i].mFullPath)) mFoundWads.Delete(i);
if (!FileExists(mFoundWads[i].mFullPath) || !FileReadable(mFoundWads[i].mFullPath)) mFoundWads.Delete(i);
}
// Now check if what got collected actually is an IWAD.