*
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.88 2003/05/08 22:19:56 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/utils/adt/arrayfuncs.c,v 1.89 2003/05/09 23:01:45 tgl Exp $
*
*-------------------------------------------------------------------------
*/
#include "access/tupmacs.h"
#include "catalog/catalog.h"
#include "catalog/pg_type.h"
+#include "libpq/pqformat.h"
#include "parser/parse_coerce.h"
#include "utils/array.h"
#include "utils/builtins.h"
#define RETURN_NULL(type) do { *isNull = true; return (type) 0; } while (0)
+/* I/O function selector for system_cache_lookup */
+typedef enum IOFuncSelector
+{
+ IOFunc_input,
+ IOFunc_output,
+ IOFunc_receive,
+ IOFunc_send
+} IOFuncSelector;
+
static int ArrayCount(char *str, int *dim, char typdelim);
static Datum *ReadArrayStr(char *arrayStr, int nitems, int ndim, int *dim,
char typdelim,
int typlen, bool typbyval, char typalign,
int *nbytes);
+static Datum *ReadArrayBinary(StringInfo buf, int nitems,
+ FmgrInfo *receiveproc, Oid typelem,
+ int typlen, bool typbyval, char typalign,
+ int *nbytes);
static void CopyArrayEls(char *p, Datum *values, int nitems,
int typlen, bool typbyval, char typalign,
bool freedata);
-static void system_cache_lookup(Oid element_type, bool input, int *typlen,
- bool *typbyval, char *typdelim, Oid *typelem,
- Oid *proc, char *typalign);
+static void system_cache_lookup(Oid element_type, IOFuncSelector which_func,
+ int *typlen, bool *typbyval,
+ char *typdelim, Oid *typelem,
+ Oid *proc, char *typalign);
static Datum ArrayCast(char *value, bool byval, int len);
static int ArrayCastAndSet(Datum src,
int typlen, bool typbyval, char typalign,
char typalign;
/* Get info about element type, including its input conversion proc */
- system_cache_lookup(element_type, true, &typlen, &typbyval, &typdelim,
+ system_cache_lookup(element_type, IOFunc_input,
+ &typlen, &typbyval, &typdelim,
&typelem, &typinput, &typalign);
fmgr_info(typinput, &inputproc);
*dim;
element_type = ARR_ELEMTYPE(v);
- system_cache_lookup(element_type, false, &typlen, &typbyval,
- &typdelim, &typelem, &typoutput, &typalign);
+ system_cache_lookup(element_type, IOFunc_output,
+ &typlen, &typbyval, &typdelim,
+ &typelem, &typoutput, &typalign);
fmgr_info(typoutput, &outputproc);
ndim = ARR_NDIM(v);
Datum
array_recv(PG_FUNCTION_ARGS)
{
- elog(ERROR, "array_recv: not implemented yet");
- return 0;
+ StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
+ Oid spec_element_type = PG_GETARG_OID(1); /* type of an array
+ * element */
+ Oid element_type;
+ int typlen;
+ bool typbyval;
+ char typdelim;
+ Oid typreceive;
+ Oid typelem;
+ FmgrInfo receiveproc;
+ int i,
+ nitems;
+ int32 nbytes;
+ Datum *dataPtr;
+ ArrayType *retval;
+ int ndim,
+ flags,
+ dim[MAXDIM],
+ lBound[MAXDIM];
+ char typalign;
+
+ /* Get the array header information */
+ ndim = pq_getmsgint(buf, 4);
+ if (ndim < 0 || ndim > MAXDIM)
+ elog(ERROR, "array_recv: invalid number of dimensions");
+ flags = pq_getmsgint(buf, 4);
+ if (flags != 0)
+ elog(ERROR, "array_recv: invalid array flags");
+ element_type = pq_getmsgint(buf, sizeof(Oid));
+ if (element_type != spec_element_type)
+ {
+ /* XXX Can we allow taking the input element type in any cases? */
+ elog(ERROR, "array_recv: wrong element type");
+ }
+
+ for (i = 0; i < ndim; i++)
+ {
+ dim[i] = pq_getmsgint(buf, 4);
+ lBound[i] = pq_getmsgint(buf, 4);
+ }
+ nitems = ArrayGetNItems(ndim, dim);
+
+ if (nitems == 0)
+ {
+ /* Return empty array */
+ retval = (ArrayType *) palloc0(sizeof(ArrayType));
+ retval->size = sizeof(ArrayType);
+ retval->elemtype = element_type;
+ PG_RETURN_ARRAYTYPE_P(retval);
+ }
+
+ /* Get info about element type, including its receive conversion proc */
+ system_cache_lookup(element_type, IOFunc_receive,
+ &typlen, &typbyval, &typdelim,
+ &typelem, &typreceive, &typalign);
+ if (!OidIsValid(typreceive))
+ elog(ERROR, "No binary input function available for type %s",
+ format_type_be(element_type));
+ fmgr_info(typreceive, &receiveproc);
+
+ dataPtr = ReadArrayBinary(buf, nitems, &receiveproc, typelem,
+ typlen, typbyval, typalign,
+ &nbytes);
+ nbytes += ARR_OVERHEAD(ndim);
+
+ retval = (ArrayType *) palloc0(nbytes);
+ retval->size = nbytes;
+ retval->ndim = ndim;
+ retval->elemtype = element_type;
+ memcpy((char *) ARR_DIMS(retval), (char *) dim,
+ ndim * sizeof(int));
+ memcpy((char *) ARR_LBOUND(retval), (char *) lBound,
+ ndim * sizeof(int));
+
+ CopyArrayEls(ARR_DATA_PTR(retval), dataPtr, nitems,
+ typlen, typbyval, typalign, true);
+ pfree(dataPtr);
+
+ PG_RETURN_ARRAYTYPE_P(retval);
+}
+
+/*---------------------------------------------------------------------------
+ * ReadArrayBinary:
+ * collect the data elements of an array being read in binary style.
+ * result :
+ * returns a palloc'd array of Datum representations of the array elements.
+ * If element type is pass-by-ref, the Datums point to palloc'd values.
+ * *nbytes is set to the amount of data space needed for the array,
+ * including alignment padding but not including array header overhead.
+ *---------------------------------------------------------------------------
+ */
+static Datum *
+ReadArrayBinary(StringInfo buf,
+ int nitems,
+ FmgrInfo *receiveproc,
+ Oid typelem,
+ int typlen,
+ bool typbyval,
+ char typalign,
+ int *nbytes)
+{
+ Datum *values;
+ int i;
+
+ values = (Datum *) palloc(nitems * sizeof(Datum));
+
+ for (i = 0; i < nitems; i++)
+ {
+ int itemlen;
+ StringInfoData elem_buf;
+ char csave;
+
+ /* Get and check the item length */
+ itemlen = pq_getmsgint(buf, 4);
+ if (itemlen < 0 || itemlen > (buf->len - buf->cursor))
+ elog(ERROR, "insufficient data left in message");
+
+ /*
+ * Rather than copying data around, we just set up a phony
+ * StringInfo pointing to the correct portion of the input
+ * buffer. We assume we can scribble on the input buffer
+ * so as to maintain the convention that StringInfos have
+ * a trailing null.
+ */
+ elem_buf.data = &buf->data[buf->cursor];
+ elem_buf.maxlen = itemlen + 1;
+ elem_buf.len = itemlen;
+ elem_buf.cursor = 0;
+
+ buf->cursor += itemlen;
+
+ csave = buf->data[buf->cursor];
+ buf->data[buf->cursor] = '\0';
+
+ /* Now call the element's receiveproc */
+ values[i] = FunctionCall2(receiveproc,
+ PointerGetDatum(&elem_buf),
+ ObjectIdGetDatum(typelem));
+
+ /* Trouble if it didn't eat the whole buffer */
+ if (elem_buf.cursor != itemlen)
+ elog(ERROR, "Improper binary format in array element %d",
+ i + 1);
+
+ buf->data[buf->cursor] = csave;
+ }
+
+ /*
+ * Compute total data space needed
+ */
+ if (typlen > 0)
+ {
+ *nbytes = nitems * att_align(typlen, typalign);
+ }
+ else
+ {
+ Assert(!typbyval);
+ *nbytes = 0;
+ for (i = 0; i < nitems; i++)
+ {
+ /* let's just make sure data is not toasted */
+ if (typlen == -1)
+ values[i] = PointerGetDatum(PG_DETOAST_DATUM(values[i]));
+ *nbytes = att_addlength(*nbytes, typlen, values[i]);
+ *nbytes = att_align(*nbytes, typalign);
+ }
+ }
+
+ return values;
}
+
/*-------------------------------------------------------------------------
* array_send :
* takes the internal representation of an array and returns a bytea
Datum
array_send(PG_FUNCTION_ARGS)
{
- elog(ERROR, "array_send: not implemented yet");
- return 0;
+ ArrayType *v = PG_GETARG_ARRAYTYPE_P(0);
+ Oid element_type;
+ int typlen;
+ bool typbyval;
+ char typdelim;
+ Oid typsend,
+ typelem;
+ FmgrInfo sendproc;
+ char typalign;
+ char *p;
+ int nitems,
+ i;
+ int ndim,
+ *dim;
+ StringInfoData buf;
+
+ /* Get information about the element type and the array dimensions */
+ element_type = ARR_ELEMTYPE(v);
+ system_cache_lookup(element_type, IOFunc_send, &typlen, &typbyval,
+ &typdelim, &typelem, &typsend, &typalign);
+ if (!OidIsValid(typsend))
+ elog(ERROR, "No binary output function available for type %s",
+ format_type_be(element_type));
+ fmgr_info(typsend, &sendproc);
+
+ ndim = ARR_NDIM(v);
+ dim = ARR_DIMS(v);
+ nitems = ArrayGetNItems(ndim, dim);
+
+ pq_begintypsend(&buf);
+
+ /* Send the array header information */
+ pq_sendint(&buf, ndim, 4);
+ pq_sendint(&buf, v->flags, 4);
+ pq_sendint(&buf, element_type, sizeof(Oid));
+ for (i = 0; i < ndim; i++)
+ {
+ pq_sendint(&buf, ARR_DIMS(v)[i], 4);
+ pq_sendint(&buf, ARR_LBOUND(v)[i], 4);
+ }
+
+ /* Send the array elements using the element's own sendproc */
+ p = ARR_DATA_PTR(v);
+ for (i = 0; i < nitems; i++)
+ {
+ Datum itemvalue;
+ bytea *outputbytes;
+
+ itemvalue = fetch_att(p, typbyval, typlen);
+
+ outputbytes = DatumGetByteaP(FunctionCall2(&sendproc,
+ itemvalue,
+ ObjectIdGetDatum(typelem)));
+ /* We assume the result will not have been toasted */
+ pq_sendint(&buf, VARSIZE(outputbytes) - VARHDRSZ, 4);
+ pq_sendbytes(&buf, VARDATA(outputbytes),
+ VARSIZE(outputbytes) - VARHDRSZ);
+ pfree(outputbytes);
+
+ p = att_addlength(p, typlen, PointerGetDatum(p));
+ p = (char *) att_align(p, typalign);
+ }
+
+ PG_RETURN_BYTEA_P(pq_endtypsend(&buf));
}
/*-------------------------------------------------------------------------
PG_RETURN_ARRAYTYPE_P(v);
/* Lookup source and result types. Unneeded variables are reused. */
- system_cache_lookup(inpType, false, &inp_typlen, &inp_typbyval,
+ system_cache_lookup(inpType, IOFunc_input, &inp_typlen, &inp_typbyval,
&typdelim, &typelem, &proc, &inp_typalign);
- system_cache_lookup(retType, false, &typlen, &typbyval,
+ system_cache_lookup(retType, IOFunc_input, &typlen, &typbyval,
&typdelim, &typelem, &proc, &typalign);
/* Allocate temporary array for new values */
static void
system_cache_lookup(Oid element_type,
- bool input,
+ IOFuncSelector which_func,
int *typlen,
bool *typbyval,
char *typdelim,
*typdelim = typeStruct->typdelim;
*typelem = typeStruct->typelem;
*typalign = typeStruct->typalign;
- if (input)
- *proc = typeStruct->typinput;
- else
- *proc = typeStruct->typoutput;
+ switch (which_func)
+ {
+ case IOFunc_input:
+ *proc = typeStruct->typinput;
+ break;
+ case IOFunc_output:
+ *proc = typeStruct->typoutput;
+ break;
+ case IOFunc_receive:
+ *proc = typeStruct->typreceive;
+ break;
+ case IOFunc_send:
+ *proc = typeStruct->typsend;
+ break;
+ }
ReleaseSysCache(typeTuple);
}
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