An explicit `1` is considered signed by compiler, if `int` is 32 bit long, a left shift `1 << 31` is undefined. Since the type of result is the type of left shift operand, make sure we shift unsigned int so that the behaviour is defined correctly. Also one fix in peep code, where it would use too big value for `item_extra_flags`.
Source directory structure
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audio
Contains files for mixing and playing music and sound.
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drawing
Low level drawing logic and palette tables.
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interface
Window and widget logic, includes high level drawing and input.
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localisation
String IDs, currency and date logic.
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network
Network and multiplayer logic, includes management of network games and downloading / uploading of content.
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management
Park management logic such as finance, marketing and research.
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peep
Guest and staff definitions and logic such as action management and pathfinding.
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platform
Compiler and operating system specific code such as type definitions, message handling and file input / output.
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ride
Data and logic for rides, vehicles and track.
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util
Utility and helper functions.
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windows
Definitions and logic for all the windows in the game.
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world
World objects and mechanics such as the climate, landscape, sprites and park.