text: #ifndef _OS_H
  #define _OS_H
  /********************************************************************
   *                                                                  *
   * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE.   *
   *                                                                  *
   * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
   * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
   * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
   *                                                                  *
   * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2002    *
   * BY THE Xiph.Org FOUNDATION http://www.xiph.org/                  *
   *                                                                  *
   ********************************************************************
  
   function: #ifdef jail to whip a few platforms into the UNIX ideal.
  
   ********************************************************************/
  
  #include <math.h>
  #include "os_types.h"
  
  #ifndef _V_IFDEFJAIL_H_
  #  define _V_IFDEFJAIL_H_
  
  #  ifdef __GNUC__
  #    define STIN static __inline__
  #  elif _WIN32
  #    define STIN static __inline
  #  endif
  #else
  #  define STIN static
  #endif
  
  #ifndef M_PI
  #  define M_PI (3.1415926536f)
  #endif
  
  #ifdef _WIN32
  #  include <malloc.h>
  #  define rint(x)   (floor((x)+0.5f)) 
  #  define NO_FLOAT_MATH_LIB
  #  define FAST_HYPOT(a, b) sqrt((a)*(a) + (b)*(b))
  #ifndef _XBOX360
  #  define LITTLE_ENDIAN 1
  #  define BYTE_ORDER LITTLE_ENDIAN
  #endif
  #endif
  
  #ifdef HAVE_ALLOCA_H
  #  include <alloca.h>
  #endif
  
  #ifdef USE_MEMORY_H
  #  include <memory.h>
  #endif
  
  #ifndef min
  #  define min(x,y)  ((x)>(y)?(y):(x))
  #endif
  
  #ifndef max
  #  define max(x,y)  ((x)<(y)?(y):(x))
  #endif
  
  #endif /* _OS_H */
  