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ncx.h

/*
 *    Copyright 1996, University Corporation for Atmospheric Research
 *    See netcdf/COPYRIGHT file for copying and redistribution conditions.
 */
/* "$Id: ncx.h,v 1.58 2005/02/07 03:56:02 ed Exp $" */

#ifndef _NCX_H_
#define _NCX_H_

/*
 * An external data representation interface.
 *
 * This started out as a general replacement for ONC XDR,
 * specifically, the xdrmem family of functions.
 * 
 * We eventually realized that we could write more portable
 * code if we decoupled any association between the 'C' types
 * and the external types. (XDR has this association between the 'C'
 * types and the external representations, like xdr_int() takes
 * an int argument and goes to an external int representation.) 
 * So, now there is a matrix of functions.
 * 
 */

#include <config.h> /* output of 'configure' */
#include "rnd.h"
#include <stddef.h> /* size_t */
#include <errno.h>
#include <sys/types.h> /* off_t */

#if defined(_CRAY) && !defined(_CRAYIEEE)
#define CRAYFLOAT 1 /* CRAY Floating point */
#elif defined(_SX) && defined(_FLOAT2)    /* NEC SUPER-UX in CRAY mode */
#define CRAYFLOAT 1 /* CRAY Floating point */
#endif


#if defined(DLL_NETCDF) /* define when library is a DLL */
#include <io.h>
#define lseek _lseeki64
#define off_t __int64
#endif      /* defined(DLL_NETCDF) */

/*
 * The integer return code for the conversion routines
 * is 0 (ENOERR) when no error occured, or NC_ERANGE as appropriate
 * for an overflow conversion.
 */
#ifndef ENOERR
#define ENOERR 0
#endif
#ifndef NC_ERANGE
#define NC_ERANGE (-60) /* N.B. must match value in netcdf.h */
#endif
#ifndef NC_ENOMEM
#define NC_ENOMEM (-61) /* N.B. must match value in netcdf.h */
#endif


/*
 * External sizes of the primitive elements.
 */
#define X_SIZEOF_CHAR         1
#define X_SIZEOF_SHORT        2
#define X_SIZEOF_INT          4     /* xdr_int */
#if 0
#define X_SIZEOF_LONG         8 */  /* xdr_long_long */
#endif
#define X_SIZEOF_FLOAT        4
#define X_SIZEOF_DOUBLE       8

/*
 * For now, netcdf is limited to 32 bit sizes,
 * If compiled with support for "large files", then
 * netcdf will use a 64 bit off_t and it can then write a file
 * using 64 bit offsets. 
 *  see also X_SIZE_MAX, X_OFF_MAX below
 */
#define X_SIZEOF_OFF_T        (sizeof(off_t))
#define X_SIZEOF_SIZE_T       X_SIZEOF_INT

/*
 * limits of the external representation
 */
#define X_SCHAR_MIN     (-128)
#define X_SCHAR_MAX     127
#define X_UCHAR_MAX     255U
#define X_SHORT_MIN     (-32768)
#define X_SHRT_MIN      X_SHORT_MIN /* alias compatible with limits.h */
#define X_SHORT_MAX     32767
#define X_SHRT_MAX      X_SHORT_MAX /* alias compatible with limits.h */
#define X_USHORT_MAX    65535U
#define X_USHRT_MAX     X_USHORT_MAX      /* alias compatible with limits.h */
#define X_INT_MIN (-2147483647-1)
#define X_INT_MAX 2147483647
#define X_UINT_MAX      4294967295U
#define X_FLOAT_MAX     3.402823466e+38f
#define X_FLOAT_MIN     (-X_FLOAT_MAX)
#define X_FLT_MAX X_FLOAT_MAX /* alias compatible with limits.h */
#if CRAYFLOAT
/* ldexp(1. - ldexp(.5 , -46), 1024) */
#define X_DOUBLE_MAX    1.79769313486230e+308
#else
/* scalb(1. - scalb(.5 , -52), 1024) */
#define X_DOUBLE_MAX    1.7976931348623157e+308 
#endif
#define X_DOUBLE_MIN    (-X_DOUBLE_MAX)
#define X_DBL_MAX X_DOUBLE_MAX      /* alias compatible with limits.h */

#define X_SIZE_MAX      X_UINT_MAX
#define X_OFF_MAX X_INT_MAX


/* Begin ncx_len */

/*
 * ncx_len_xxx() interfaces are defined as macros below, 
 * These give the length of an array of nelems of the type.
 * N.B. The 'char' and 'short' interfaces give the X_ALIGNED length.
 */
#define X_ALIGN               4     /* a.k.a. BYTES_PER_XDR_UNIT */

#define ncx_len_char(nelems) \
      _RNDUP((nelems), X_ALIGN)

#define ncx_len_short(nelems) \
      (((nelems) + (nelems)%2)  * X_SIZEOF_SHORT)

#define ncx_len_int(nelems) \
      ((nelems) * X_SIZEOF_INT)

#define ncx_len_long(nelems) \
      ((nelems) * X_SIZEOF_LONG)

#define ncx_len_float(nelems) \
      ((nelems) * X_SIZEOF_FLOAT)

#define ncx_len_double(nelems) \
      ((nelems) * X_SIZEOF_DOUBLE)

/* End ncx_len */

#if __CHAR_UNSIGNED__
      /* 'char' is unsigned, declare ncbyte as 'signed char' */
typedef signed char schar;

#else
      /* 'char' is signed */
typedef signed char schar;

#endif      /* __CHAR_UNSIGNED__ */

/*
 * Primitive numeric conversion functions.
 * The `put' functions convert from native internal
 * type to the external type, while the `get' functions
 * convert from the external to the internal.
 *
 * These take the form
 *    int ncx_get_{external_type}_{internal_type}(
 *          const void *xp,
 *          internal_type *ip
 *    );
 *    int ncx_put_{external_type}_{internal_type}(
 *          void *xp,
 *          const internal_type *ip
 *    );
 * where
 *    `external_type' and `internal_type' chosen from
            schar
            uchar
            short
            ushort
            int
            uint
            long
            ulong
            float
            double
 *
 * Not all combinations make sense.
 * We may not implement all combinations that make sense.
 * The netcdf functions that use this ncx interface don't
 * use these primitive conversion functions. They use the
 * aggregate conversion functions declared below.
 *
 * Storage for a single element of external type is at the `void * xp'
 * argument.
 *
 * Storage for a single element of internal type is at `ip' argument.
 *
 * These functions return 0 (ENOERR) when no error occured,
 * or NC_ERANGE when the value being converted is too large.
 * When NC_ERANGE occurs, an undefined (implementation dependent)
 * conversion may have occured.
 *
 * Note that loss of precision may occur silently.
 *
 */

#if 0
extern int
ncx_get_schar_schar(const void *xp, schar *ip);
extern int
ncx_get_schar_uchar(const void *xp, uchar *ip);
extern int
ncx_get_schar_short(const void *xp, short *ip);
extern int
ncx_get_schar_int(const void *xp, int *ip);
extern int
ncx_get_schar_long(const void *xp, long *ip);
extern int
ncx_get_schar_float(const void *xp, float *ip);
extern int
ncx_get_schar_double(const void *xp, double *ip);

extern int
ncx_put_schar_schar(void *xp, const schar *ip);
extern int
ncx_put_schar_uchar(void *xp, const uchar *ip);
extern int
ncx_put_schar_short(void *xp, const short *ip);
extern int
ncx_put_schar_int(void *xp, const int *ip);
extern int
ncx_put_schar_long(void *xp, const long *ip);
extern int
ncx_put_schar_float(void *xp, const float *ip);
extern int
ncx_put_schar_double(void *xp, const double *ip);
#endif
 

extern int
ncx_get_short_schar(const void *xp, schar *ip);
extern int
ncx_get_short_uchar(const void *xp, uchar *ip);
extern int
ncx_get_short_short(const void *xp, short *ip);
extern int
ncx_get_short_int(const void *xp, int *ip);
extern int
ncx_get_short_long(const void *xp, long *ip);
extern int
ncx_get_short_float(const void *xp, float *ip);
extern int
ncx_get_short_double(const void *xp, double *ip);

extern int
ncx_put_short_schar(void *xp, const schar *ip);
extern int
ncx_put_short_uchar(void *xp, const uchar *ip);
extern int
ncx_put_short_short(void *xp, const short *ip);
extern int
ncx_put_short_int(void *xp, const int *ip);
extern int
ncx_put_short_long(void *xp, const long *ip);
extern int
ncx_put_short_float(void *xp, const float *ip);
extern int
ncx_put_short_double(void *xp, const double *ip);
 

extern int
ncx_get_int_schar(const void *xp, schar *ip);
extern int
ncx_get_int_uchar(const void *xp, uchar *ip);
extern int
ncx_get_int_short(const void *xp, short *ip);
extern int
ncx_get_int_int(const void *xp, int *ip);
extern int
ncx_get_int_long(const void *xp, long *ip);
extern int
ncx_get_int_float(const void *xp, float *ip);
extern int
ncx_get_int_double(const void *xp, double *ip);

extern int
ncx_put_int_schar(void *xp, const schar *ip);
extern int
ncx_put_int_uchar(void *xp, const uchar *ip);
extern int
ncx_put_int_short(void *xp, const short *ip);
extern int
ncx_put_int_int(void *xp, const int *ip);
extern int
ncx_put_int_long(void *xp, const long *ip);
extern int
ncx_put_int_float(void *xp, const float *ip);
extern int
ncx_put_int_double(void *xp, const double *ip);
 

extern int
ncx_get_float_schar(const void *xp, schar *ip);
extern int
ncx_get_float_uchar(const void *xp, uchar *ip);
extern int
ncx_get_float_short(const void *xp, short *ip);
extern int
ncx_get_float_int(const void *xp, int *ip);
extern int
ncx_get_float_long(const void *xp, long *ip);
extern int
ncx_get_float_float(const void *xp, float *ip);
extern int
ncx_get_float_double(const void *xp, double *ip);

extern int
ncx_put_float_schar(void *xp, const schar *ip);
extern int
ncx_put_float_uchar(void *xp, const uchar *ip);
extern int
ncx_put_float_short(void *xp, const short *ip);
extern int
ncx_put_float_int(void *xp, const int *ip);
extern int
ncx_put_float_long(void *xp, const long *ip);
extern int
ncx_put_float_float(void *xp, const float *ip);
extern int
ncx_put_float_double(void *xp, const double *ip);
 

extern int
ncx_get_double_schar(const void *xp, schar *ip);
extern int
ncx_get_double_uchar(const void *xp, uchar *ip);
extern int
ncx_get_double_short(const void *xp, short *ip);
extern int
ncx_get_double_int(const void *xp, int *ip);
extern int
ncx_get_double_long(const void *xp, long *ip);
extern int
ncx_get_double_float(const void *xp, float *ip);
extern int
ncx_get_double_double(const void *xp, double *ip);

extern int
ncx_put_double_schar(void *xp, const schar *ip);
extern int
ncx_put_double_uchar(void *xp, const uchar *ip);
extern int
ncx_put_double_short(void *xp, const short *ip);
extern int
ncx_put_double_int(void *xp, const int *ip);
extern int
ncx_put_double_long(void *xp, const long *ip);
extern int
ncx_put_double_float(void *xp, const float *ip);
extern int
ncx_put_double_double(void *xp, const double *ip);
 

/*
 * Other primitive conversion functions
 * N.B. slightly different interface
 * Used by netcdf.
 */

/* ncx_get_int_size_t */
extern int
ncx_get_size_t(const void **xpp, size_t *ulp);
/* ncx_get_int_off_t */
extern int
ncx_get_off_t(const void **xpp, off_t *lp, size_t sizeof_off_t);

/* ncx_put_int_size_t */
extern int
ncx_put_size_t(void **xpp, const size_t *ulp);
/* ncx_put_int_off_t */
extern int
ncx_put_off_t(void **xpp, const off_t *lp, size_t sizeof_off_t);


/*
 * Aggregate numeric conversion functions.
 * Convert an array.  Replaces xdr_array(...).
 * These functions are used by netcdf. Unlike the xdr
 * interface, we optimize for aggregate conversions.
 * This functions should be implemented to take advantage
 * of multiple processor / parallel hardware where available.
 *
 * These take the form
 *    int ncx_getn_{external_type}_{internal_type}(
 *          const void *xpp,
 *          size_t nelems,
 *          internal_type *ip
 *    );
 *    int ncx_putn_{external_type}_{internal_type}(
 *          void **xpp,
 *          size_t nelems,
 *          const internal_type *ip
 *    );
 * Where the types are as in the primitive numeric conversion functions.
 *
 * The value of the pointer to pointer argument, *xpp, is
 * expected to reference storage for `nelems' of the external
 * type.  On return, it modified to reference just past the last
 * converted external element.
 *
 * The types whose external size is less than X_ALIGN also have `pad'
 * interfaces. These round (and zero fill on put) *xpp up to X_ALIGN
 * boundaries. (This is the usual xdr behavior.)
 *
 * The `ip' argument should point to an array of `nelems' of
 * internal_type.
 *
 * Range errors (NC_ERANGE) for a individual values in the array 
 * DO NOT terminate the array conversion. All elements are converted,
 * with some having undefined values.
 * If any range error occurs, the function returns NC_ERANGE.
 *
 */

extern int
ncx_getn_schar_schar(const void **xpp, size_t nelems, schar *ip);
extern int
ncx_getn_schar_uchar(const void **xpp, size_t nelems, uchar *ip);
extern int
ncx_getn_schar_short(const void **xpp, size_t nelems, short *ip);
extern int
ncx_getn_schar_int(const void **xpp, size_t nelems, int *ip);
extern int
ncx_getn_schar_long(const void **xpp, size_t nelems, long *ip);
extern int
ncx_getn_schar_float(const void **xpp, size_t nelems, float *ip);
extern int
ncx_getn_schar_double(const void **xpp, size_t nelems, double *ip);

extern int
ncx_pad_getn_schar_schar(const void **xpp, size_t nelems, schar *ip);
extern int
ncx_pad_getn_schar_uchar(const void **xpp, size_t nelems, uchar *ip);
extern int
ncx_pad_getn_schar_short(const void **xpp, size_t nelems, short *ip);
extern int
ncx_pad_getn_schar_int(const void **xpp, size_t nelems, int *ip);
extern int
ncx_pad_getn_schar_long(const void **xpp, size_t nelems, long *ip);
extern int
ncx_pad_getn_schar_float(const void **xpp, size_t nelems, float *ip);
extern int
ncx_pad_getn_schar_double(const void **xpp, size_t nelems, double *ip);

extern int
ncx_putn_schar_schar(void **xpp, size_t nelems, const schar *ip);
extern int
ncx_putn_schar_uchar(void **xpp, size_t nelems, const uchar *ip);
extern int
ncx_putn_schar_short(void **xpp, size_t nelems, const short *ip);
extern int
ncx_putn_schar_int(void **xpp, size_t nelems, const int *ip);
extern int
ncx_putn_schar_long(void **xpp, size_t nelems, const long *ip);
extern int
ncx_putn_schar_float(void **xpp, size_t nelems, const float *ip);
extern int
ncx_putn_schar_double(void **xpp, size_t nelems, const double *ip);
 
extern int
ncx_pad_putn_schar_schar(void **xpp, size_t nelems, const schar *ip);
extern int
ncx_pad_putn_schar_uchar(void **xpp, size_t nelems, const uchar *ip);
extern int
ncx_pad_putn_schar_short(void **xpp, size_t nelems, const short *ip);
extern int
ncx_pad_putn_schar_int(void **xpp, size_t nelems, const int *ip);
extern int
ncx_pad_putn_schar_long(void **xpp, size_t nelems, const long *ip);
extern int
ncx_pad_putn_schar_float(void **xpp, size_t nelems, const float *ip);
extern int
ncx_pad_putn_schar_double(void **xpp, size_t nelems, const double *ip);


extern int
ncx_getn_short_schar(const void **xpp, size_t nelems, schar *ip);
extern int
ncx_getn_short_uchar(const void **xpp, size_t nelems, uchar *ip);
extern int
ncx_getn_short_short(const void **xpp, size_t nelems, short *ip);
extern int
ncx_getn_short_int(const void **xpp, size_t nelems, int *ip);
extern int
ncx_getn_short_long(const void **xpp, size_t nelems, long *ip);
extern int
ncx_getn_short_float(const void **xpp, size_t nelems, float *ip);
extern int
ncx_getn_short_double(const void **xpp, size_t nelems, double *ip);

extern int
ncx_pad_getn_short_schar(const void **xpp, size_t nelems, schar *ip);
extern int
ncx_pad_getn_short_uchar(const void **xpp, size_t nelems, uchar *ip);
extern int
ncx_pad_getn_short_short(const void **xpp, size_t nelems, short *ip);
extern int
ncx_pad_getn_short_int(const void **xpp, size_t nelems, int *ip);
extern int
ncx_pad_getn_short_long(const void **xpp, size_t nelems, long *ip);
extern int
ncx_pad_getn_short_float(const void **xpp, size_t nelems, float *ip);
extern int
ncx_pad_getn_short_double(const void **xpp, size_t nelems, double *ip);

extern int
ncx_putn_short_schar(void **xpp, size_t nelems, const schar *ip);
extern int
ncx_putn_short_uchar(void **xpp, size_t nelems, const uchar *ip);
extern int
ncx_putn_short_short(void **xpp, size_t nelems, const short *ip);
extern int
ncx_putn_short_int(void **xpp, size_t nelems, const int *ip);
extern int
ncx_putn_short_long(void **xpp, size_t nelems, const long *ip);
extern int
ncx_putn_short_float(void **xpp, size_t nelems, const float *ip);
extern int
ncx_putn_short_double(void **xpp, size_t nelems, const double *ip);
 
extern int
ncx_pad_putn_short_schar(void **xpp, size_t nelems, const schar *ip);
extern int
ncx_pad_putn_short_uchar(void **xpp, size_t nelems, const uchar *ip);
extern int
ncx_pad_putn_short_short(void **xpp, size_t nelems, const short *ip);
extern int
ncx_pad_putn_short_int(void **xpp, size_t nelems, const int *ip);
extern int
ncx_pad_putn_short_long(void **xpp, size_t nelems, const long *ip);
extern int
ncx_pad_putn_short_float(void **xpp, size_t nelems, const float *ip);
extern int
ncx_pad_putn_short_double(void **xpp, size_t nelems, const double *ip);


extern int
ncx_getn_int_schar(const void **xpp, size_t nelems, schar *ip);
extern int
ncx_getn_int_uchar(const void **xpp, size_t nelems, uchar *ip);
extern int
ncx_getn_int_short(const void **xpp, size_t nelems, short *ip);
extern int
ncx_getn_int_int(const void **xpp, size_t nelems, int *ip);
extern int
ncx_getn_int_long(const void **xpp, size_t nelems, long *ip);
extern int
ncx_getn_int_float(const void **xpp, size_t nelems, float *ip);
extern int
ncx_getn_int_double(const void **xpp, size_t nelems, double *ip);

extern int
ncx_putn_int_schar(void **xpp, size_t nelems, const schar *ip);
extern int
ncx_putn_int_uchar(void **xpp, size_t nelems, const uchar *ip);
extern int
ncx_putn_int_short(void **xpp, size_t nelems, const short *ip);
extern int
ncx_putn_int_int(void **xpp, size_t nelems, const int *ip);
extern int
ncx_putn_int_long(void **xpp, size_t nelems, const long *ip);
extern int
ncx_putn_int_float(void **xpp, size_t nelems, const float *ip);
extern int
ncx_putn_int_double(void **xpp, size_t nelems, const double *ip);
 

extern int
ncx_getn_float_schar(const void **xpp, size_t nelems, schar *ip);
extern int
ncx_getn_float_uchar(const void **xpp, size_t nelems, uchar *ip);
extern int
ncx_getn_float_short(const void **xpp, size_t nelems, short *ip);
extern int
ncx_getn_float_int(const void **xpp, size_t nelems, int *ip);
extern int
ncx_getn_float_long(const void **xpp, size_t nelems, long *ip);
extern int
ncx_getn_float_float(const void **xpp, size_t nelems, float *ip);
extern int
ncx_getn_float_double(const void **xpp, size_t nelems, double *ip);

extern int
ncx_putn_float_schar(void **xpp, size_t nelems, const schar *ip);
extern int
ncx_putn_float_uchar(void **xpp, size_t nelems, const uchar *ip);
extern int
ncx_putn_float_short(void **xpp, size_t nelems, const short *ip);
extern int
ncx_putn_float_int(void **xpp, size_t nelems, const int *ip);
extern int
ncx_putn_float_long(void **xpp, size_t nelems, const long *ip);
extern int
ncx_putn_float_float(void **xpp, size_t nelems, const float *ip);
extern int
ncx_putn_float_double(void **xpp, size_t nelems, const double *ip);
 

extern int
ncx_getn_double_schar(const void **xpp, size_t nelems, schar *ip);
extern int
ncx_getn_double_uchar(const void **xpp, size_t nelems, uchar *ip);
extern int
ncx_getn_double_short(const void **xpp, size_t nelems, short *ip);
extern int
ncx_getn_double_int(const void **xpp, size_t nelems, int *ip);
extern int
ncx_getn_double_long(const void **xpp, size_t nelems, long *ip);
extern int
ncx_getn_double_float(const void **xpp, size_t nelems, float *ip);
extern int
ncx_getn_double_double(const void **xpp, size_t nelems, double *ip);

extern int
ncx_putn_double_schar(void **xpp, size_t nelems, const schar *ip);
extern int
ncx_putn_double_uchar(void **xpp, size_t nelems, const uchar *ip);
extern int
ncx_putn_double_short(void **xpp, size_t nelems, const short *ip);
extern int
ncx_putn_double_int(void **xpp, size_t nelems, const int *ip);
extern int
ncx_putn_double_long(void **xpp, size_t nelems, const long *ip);
extern int
ncx_putn_double_float(void **xpp, size_t nelems, const float *ip);
extern int
ncx_putn_double_double(void **xpp, size_t nelems, const double *ip);
 

/*
 * Other aggregate conversion functions.
 */

/* read ASCII characters */
extern int
ncx_getn_text(const void **xpp, size_t nchars, char *cp);
extern int
ncx_pad_getn_text(const void **xpp, size_t nchars, char *cp);

/* write ASCII characters */
extern int
ncx_putn_text(void **xpp, size_t nchars, const char *cp);
extern int
ncx_pad_putn_text(void **xpp, size_t nchars, const char *cp);

/* for symmetry */
#define ncx_getn_char_char(xpp, nelems, fillp) ncx_getn_text(xpp, nelems, fillp)
#define ncx_putn_char_char(xpp, nelems, fillp) ncx_putn_text(xpp, nelems, fillp)

/* read opaque data */
extern int
ncx_getn_void(const void **xpp, size_t nchars, void *vp);
extern int
ncx_pad_getn_void(const void **xpp, size_t nchars, void *vp);

/* write opaque data */
extern int
ncx_putn_void(void **xpp, size_t nchars, const void *vp);
extern int
ncx_pad_putn_void(void **xpp, size_t nchars, const void *vp);

#endif /* _NCX_H_ */

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