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Replace unsafe char->WCHAR casts with str::CastToWCHAR and fix ToUtf8Temp usage (EbookDoc, EngineImages, StrconvUtil). Add bounds and overflow checks for allocations and early returns to prevent integer/size_t overflows and invalid allocations (Screenshot, SumatraDialogs). Fix format specifiers and pointer formatting in logging (SearchAndDDE, SumatraPDF). Use the original view mode string when building DDE commands to avoid unnecessary wide-string conversion (SumatraStartup). Adjust TGA serialization to use size_t casts for safe size calculations and allocation (TgaReader). These changes address potential UB, allocation overflows and improve robustness.
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