49 lines
1.4 KiB
Python
49 lines
1.4 KiB
Python
import sys
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import array
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__all__ = ["SDL_LIL_ENDIAN", "SDL_BIG_ENDIAN", "SDL_BYTEORDER", "SDL_Swap16",
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"SDL_Swap32", "SDL_Swap64", "SDL_SwapFloat", "SDL_SwapLE16",
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"SDL_SwapLE32", "SDL_SwapLE64", "SDL_SwapFloatLE", "SDL_SwapBE16",
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"SDL_SwapBE32", "SDL_SwapBE64", "SDL_SwapFloatBE"
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]
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SDL_LIL_ENDIAN = 1234
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SDL_BIG_ENDIAN = 4321
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if sys.byteorder == "little":
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SDL_BYTEORDER = SDL_LIL_ENDIAN
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else:
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SDL_BYTEORDER = SDL_BIG_ENDIAN
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SDL_Swap16 = lambda x: ((x << 8 & 0xFF00) | (x >> 8 & 0x00FF))
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SDL_Swap32 = lambda x: (((x << 24) & 0xFF000000) |
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((x << 8) & 0x00FF0000) |
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((x >> 8) & 0x0000FF00) |
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((x >> 24) & 0x000000FF))
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SDL_Swap64 = lambda x: ((SDL_Swap32(x & 0xFFFFFFFF) << 32) |
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(SDL_Swap32(x >> 32 & 0xFFFFFFFF)))
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def SDL_SwapFloat(x):
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ar = array.array("d", (x,))
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ar.byteswap()
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return ar[0]
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def _nop(x):
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return x
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if SDL_BYTEORDER == SDL_LIL_ENDIAN:
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SDL_SwapLE16 = _nop
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SDL_SwapLE32 = _nop
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SDL_SwapLE64 = _nop
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SDL_SwapFloatLE = _nop
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SDL_SwapBE16 = SDL_Swap16
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SDL_SwapBE32 = SDL_Swap32
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SDL_SwapBE64 = SDL_Swap64
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SDL_SwapFloatBE = SDL_SwapFloat
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else:
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SDL_SwapLE16 = SDL_Swap16
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SDL_SwapLE32 = SDL_Swap32
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SDL_SwapLE64 = SDL_Swap64
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SDL_SwapFloatLE = SDL_SwapFloat
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SDL_SwapBE16 = _nop
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SDL_SwapBE32 = _nop
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SDL_SwapBE64 = _nop
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SDL_SwapFloatBE = _nop
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