Thursday, July 21, 2022

Sizes of Windows integral types

While developing WinSafe, it’s very common to convert the Windows integral data types to their Rust equivalent. Care must be taken, however, when it comes to pointer size, which varies according to the architecture. Since WinSafe is aimed to both 32 and 64-bit Windows, I must pay attention.

For reference, below is the table I’m using to figure out the sizes:

Signed C Signed Rust Unsigned C Unsigned Rust 32-bit 64-bit
CHAR
 
 
i8 UCHAR
BYTE
BOOLEAN
u8 8 bit (1 byte)
SHORT
 
 
i16 USHORT
WCHAR
WORD
u16 16 bit (2 byte)
BOOL
INT
LONG
 
i32  
UINT
ULONG
DWORD
u32 32 bit (4 byte)
INT_PTR
LONG_PTR
LPARAM
 
isize UINT_PTR
ULONG_PTR
WPARAM
SIZE_T
usize 32 bit (4 byte) 64 bit (8 byte)
LARGE_INTEGER
LONG64
LONGLONG
 
 
i64 ULARGE_INTEGER
ULONG64
ULONGLONG
DWORD64
DWORDLONG
QWORD
u64 64 bit (8 byte)

The table above is an extension of this one.

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