array.h
上传用户:blenddy
上传日期:2007-01-07
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文件大小:5k
- /*-------------------------------------------------------------------------
- *
- * array.h
- * Utilities for the new array code. Contain prototypes from the
- * following files:
- * utils/adt/arrayfuncs.c
- * utils/adt/arrayutils.c
- * utils/adt/chunk.c
- *
- *
- * Copyright (c) 1994, Regents of the University of California
- *
- * $Id: array.h,v 1.18.2.1 1999/08/02 05:25:24 scrappy Exp $
- *
- * NOTES
- * XXX the data array should be LONGALIGN'd -- notice that the array
- * allocation code does not allocate the extra space required for this,
- * even though the array-packing code does the LONGALIGNs.
- *
- *-------------------------------------------------------------------------
- */
- #ifndef ARRAY_H
- #define ARRAY_H
- #include "utils/memutils.h"
- typedef struct
- {
- int size; /* total array size (in bytes) */
- int ndim; /* # of dimensions */
- int flags; /* implementation flags */
- } ArrayType;
- /*
- * bitmask of ArrayType flags field:
- * 1st bit - large object flag
- * 2nd bit - chunk flag (array is chunked if set)
- * 3rd,4th,&5th bit - large object type (used only if bit 1 is set)
- */
- #define ARR_LOB_FLAG (0x1)
- #define ARR_CHK_FLAG (0x2)
- #define ARR_OBJ_MASK (0x1c)
- #define ARR_FLAGS(a) ((ArrayType *) a)->flags
- #define ARR_SIZE(a) (((ArrayType *) a)->size)
- #define ARR_NDIM(a) (((ArrayType *) a)->ndim)
- #define ARR_NDIM_PTR(a) (&(((ArrayType *) a)->ndim))
- #define ARR_IS_LO(a)
- (((ArrayType *) a)->flags & ARR_LOB_FLAG)
- #define SET_LO_FLAG(f,a)
- (((ArrayType *) a)->flags |= ((f) ? ARR_LOB_FLAG : 0x0))
- #define ARR_IS_CHUNKED(a)
- (((ArrayType *) a)->flags & ARR_CHK_FLAG)
- #define SET_CHUNK_FLAG(f,a)
- (((ArrayType *) a)->flags |= ((f) ? ARR_CHK_FLAG : 0x0))
- #define ARR_OBJ_TYPE(a)
- ((ARR_FLAGS(a) & ARR_OBJ_MASK) >> 2)
- #define SET_OBJ_TYPE(f,a)
- ((ARR_FLAGS(a)&= ~ARR_OBJ_MASK), (ARR_FLAGS(a)|=((f<<2)&ARR_OBJ_MASK)))
- /*
- * ARR_DIMS returns a pointer to an array of array dimensions (number of
- * elements along the various array axes).
- *
- * ARR_LBOUND returns a pointer to an array of array lower bounds.
- *
- * That is: if the third axis of an array has elements 5 through 10, then
- * ARR_DIMS(a)[2] == 6 and ARR_LBOUND[2] == 5.
- *
- * Unlike C, the default lower bound is 1.
- */
- #define ARR_DIMS(a)
- ((int *) (((char *) a) + sizeof(ArrayType)))
- #define ARR_LBOUND(a)
- ((int *) (((char *) a) + sizeof(ArrayType) +
- (sizeof(int) * (((ArrayType *) a)->ndim))))
- /*
- * Returns a pointer to the actual array data.
- */
- #define ARR_DATA_PTR(a)
- (((char *) a) +
- MAXALIGN(sizeof(ArrayType) + 2 * (sizeof(int) * (a)->ndim)))
- /*
- * The total array header size for an array of dimension n (in bytes).
- */
- #define ARR_OVERHEAD(n)
- (MAXALIGN(sizeof(ArrayType) + 2 * (n) * sizeof(int)))
- /*------------------------------------------------------------------------
- * Miscellaneous helper definitions and routines for arrayfuncs.c
- *------------------------------------------------------------------------
- */
- #define RETURN_NULL {*isNull = true; return(0); }
- #define NAME_LEN 30
- #define MAX_BUFF_SIZE BLCKSZ
- typedef struct
- {
- char lo_name[NAME_LEN];
- int C[MAXDIM];
- } CHUNK_INFO;
- /*
- * prototypes for functions defined in arrayfuncs.c
- */
- extern char *array_in(char *string, Oid element_type, int32 typmod);
- extern char *array_out(ArrayType *v, Oid element_type);
- extern char *array_dims(ArrayType *v, bool *isNull);
- extern Datum array_ref(ArrayType *array, int n, int *indx, int reftype,
- int elmlen, int arraylen, bool *isNull);
- extern Datum array_clip(ArrayType *array, int n, int *upperIndx,
- int *lowerIndx, int reftype, int len, bool *isNull);
- extern char *array_set(ArrayType *array, int n, int *indx, char *dataPtr,
- int reftype, int elmlen, int arraylen, bool *isNull);
- extern char *array_assgn(ArrayType *array, int n, int *upperIndx,
- int *lowerIndx, ArrayType *newArr, int reftype,
- int len, bool *isNull);
- extern ArrayType *array_map(ArrayType *v, Oid type,
- char *(*fn) (),
- Oid retType, int nargs,...);
- extern int array_eq(ArrayType *array1, ArrayType *array2);
- extern int _LOtransfer(char **destfd, int size, int nitems, char **srcfd,
- int isSrcLO, int isDestLO);
- extern char *_array_newLO(int *fd, int flag);
- /*
- * prototypes for functions defined in arrayutils.c
- * [these names seem to be too generic. Add prefix for arrays? -- AY]
- */
- extern int GetOffset(int n, int *dim, int *lb, int *indx);
- extern int getNitems(int n, int *a);
- extern int compute_size(int *st, int *endp, int n, int base);
- extern void mda_get_offset_values(int n, int *dist, int *PC, int *span);
- extern void mda_get_range(int n, int *span, int *st, int *endp);
- extern void mda_get_prod(int n, int *range, int *P);
- extern int tuple2linear(int n, int *tup, int *scale);
- extern void array2chunk_coord(int n, int *C, int *a_coord, int *c_coord);
- extern int next_tuple(int n, int *curr, int *span);
- /*
- * prototypes for functions defined in chunk.c
- */
- extern char *_ChunkArray(int fd, FILE *afd, int ndim, int *dim, int baseSize,
- int *nbytes, char *chunkfile);
- extern int _ReadChunkArray(int *st, int *endp, int bsize, int fp,
- char *destfp, ArrayType *array, int isDestLO, bool *isNull);
- extern struct varlena *_ReadChunkArray1El(int *st, int bsize, int fp,
- ArrayType *array, bool *isNull);
- #endif /* ARRAY_H */