typedefs.h

音频编解码库的具体实现,分析流程清晰,编译测试通过

/*
********************************************************************************
*
*      GSM AMR speech codec   Version 2.0.0   February 8, 1999
*
********************************************************************************
*
*      File             : typedefs.h
*      Description      : Definition of platform independent data
*                         types and constants
*
*
*      The following platform independent data types and corresponding
*      preprocessor (#define) constants are defined:
*
*        defined type  meaning           corresponding constants
*        ----------------------------------------------------------
*        Char          character         (none)
*        Bool          boolean           true, false
*        Word8         8-bit signed      minWord8,   maxWord8
*        UWord8        8-bit unsigned    minUWord8,  maxUWord8
*        Word16        16-bit signed     minWord16,  maxWord16
*        UWord16       16-bit unsigned   minUWord16, maxUWord16
*        Word32        32-bit signed     minWord32,  maxWord32
*        UWord32       32-bit unsigned   minUWord32, maxUWord32
*
*
*      The following compile switches are #defined:
*
*        PLATFORM      string indicating platform progam is compiled on
*                      possible values: "OSF", "PC", "SUN"
*
*        OSF           only defined if the current platform is an Alpha
*        PC            only defined if the current platform is a PC
*        SUN           only defined if the current platform is a Sun
*        
*        LSBFIRST      is defined if the byte order on this platform is
*                      "least significant byte first" -> defined on DEC Alpha
*                      and PC, undefined on Sun
*
********************************************************************************
*/
#ifndef typedefs_h
#define typedefs_h "$Id $"

/*
********************************************************************************
*                         INCLUDE FILES
********************************************************************************
*/
#include <limits.h>



/*
********************************************************************************
*                         DEFINITION OF CONSTANTS 
********************************************************************************
*/
/*
 ********* define char type
 */
typedef char Char;
/*
 ********* define Flag type
 */
typedef int Flag;

/*
 ********* define 8 bit signed/unsigned types & constants
 */
#if SCHAR_MAX == 127
typedef signed char Word8;
#define minWord8  SCHAR_MIN
#define maxWord8  SCHAR_MAX

typedef unsigned char UWord8;
#define minUWord8 0
#define maxUWord8 UCHAR_MAX
#else
#error cannot find 8-bit type
#endif


/*
 ********* define 16 bit signed/unsigned types & constants
 */
#if INT_MAX == 32767
typedef int Word16;
#define minWord16     INT_MIN
#define maxWord16     INT_MAX
typedef unsigned int UWord16;
#define minUWord16    0
#define maxUWord16    UINT_MAX
#elif SHRT_MAX == 32767
typedef short Word16;
#define minWord16     SHRT_MIN
#define maxWord16     SHRT_MAX
typedef unsigned short UWord16;
#define minUWord16    0
#define maxUWord16    USHRT_MAX
#else
#error cannot find 16-bit type
#endif


/*
 ********* define 32 bit signed/unsigned types & constants
 */
#if INT_MAX == 2147483647L
typedef int Word32;
#define minWord32     INT_MIN
#define maxWord32     INT_MAX
typedef unsigned int UWord32;
#define minUWord32    0
#define maxUWord32    UINT_MAX
#elif LONG_MAX == 2147483647L
typedef long Word32;
#define minWord32     LONG_MIN
#define maxWord32     LONG_MAX
typedef unsigned long UWord32;
#define minUWord32    0
#define maxUWord32    ULONG_MAX
#endif


/*
 ********* define boolean type
 */
typedef int Bool;
#define false 0
#define true 1

/*
 ********* Check current platform
 */
#if defined(__MSDOS__)
#define PC
#define PLATFORM "PC"
#define LSBFIRST
#elif defined(__osf__)
#define OSF
#define PLATFORM "OSF"
#define LSBFIRST
#elif defined(__sun__)
#define SUN
#define PLATFORM "SUN"
#undef LSBFIRST
#elif defined(linux) && defined(i386)
#define PC
#define PLATFORM "PC"
#define LSBFIRST
#endif

#endif