janwas
85a8d217de
byte_order: use config.h defines (avoids pulling in sdl.h everywhere) precompiled: now include *all* C++ headers This was SVN commit r2436.
25 lines
915 B
C
25 lines
915 B
C
#include "config.h"
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// converts 4 character string to u32 for easy comparison
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// can't pass code as string, and use s[0]..s[3], because
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// VC6/7 don't realize the macro is constant
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// (it should be useable as a switch{} expression)
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//
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// these casts are ugly but necessary. u32 is required because u8 << 8 == 0;
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// the additional u8 cast ensures each character is treated as unsigned
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// (otherwise, they'd be promoted to signed int before the u32 cast,
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// which would break things).
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#ifdef BIG_ENDIAN
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#define FOURCC(a,b,c,d) ( ((u32)(u8)a) << 24 | ((u32)(u8)b) << 16 | \
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((u32)(u8)c) << 8 | ((u32)(u8)d) << 0 )
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#else
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#define FOURCC(a,b,c,d) ( ((u32)(u8)a) << 0 | ((u32)(u8)b) << 8 | \
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((u32)(u8)c) << 16 | ((u32)(u8)d) << 24 )
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#endif
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extern u16 read_le16(const void* p);
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extern u32 read_le32(const void* p);
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extern u16 read_be16(const void* p);
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extern u32 read_be32(const void* p);
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