mirror of
https://git.osgeo.org/gitea/postgis/postgis
synced 2024-10-25 17:42:38 +00:00
175b49b4fe
git-svn-id: http://svn.osgeo.org/postgis/trunk@1189 b70326c6-7e19-0410-871a-916f4a2858ee
527 lines
12 KiB
C
527 lines
12 KiB
C
#include "postgres.h"
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#include <math.h>
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#include <float.h>
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#include <string.h>
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#include <stdio.h>
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#include <errno.h>
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#include <sys/param.h>
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#include <sys/types.h>
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#include "access/gist.h"
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#include "access/itup.h"
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#include "access/rtree.h"
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#include "fmgr.h"
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#include "utils/elog.h"
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#if USE_VERSION > 73
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# include "lib/stringinfo.h" // for binary input
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#endif
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#include "liblwgeom.h"
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#include "stringBuffer.h"
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//#define DEBUG 1
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#include "lwgeom_pg.h"
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#include "wktparse.h"
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void elog_ERROR(const char* string);
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Datum LWGEOM_in(PG_FUNCTION_ARGS);
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Datum LWGEOM_out(PG_FUNCTION_ARGS);
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Datum LWGEOM_to_text(PG_FUNCTION_ARGS);
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Datum LWGEOM_to_bytea(PG_FUNCTION_ARGS);
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Datum LWGEOM_from_bytea(PG_FUNCTION_ARGS);
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Datum parse_WKT_lwgeom(PG_FUNCTION_ARGS);
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#if USE_VERSION > 73
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Datum LWGEOM_recv(PG_FUNCTION_ARGS);
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Datum LWGEOM_send(PG_FUNCTION_ARGS);
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#endif
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// included here so we can be independent from postgis
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// WKB structure -- exactly the same as TEXT
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typedef struct Well_known_bin {
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int32 size; // total size of this structure
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unsigned char data[1]; //THIS HOLD VARIABLE LENGTH DATA
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} WellKnownBinary;
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// LWGEOM_in(cstring)
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// format is '[SRID=#;]wkt|wkb'
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// LWGEOM_in( 'SRID=99;POINT(0 0)')
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// LWGEOM_in( 'POINT(0 0)') --> assumes SRID=-1
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// LWGEOM_in( 'SRID=99;0101000000000000000000F03F000000000000004')
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// returns a PG_LWGEOM object
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PG_FUNCTION_INFO_V1(LWGEOM_in);
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Datum LWGEOM_in(PG_FUNCTION_ARGS)
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{
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char *str = PG_GETARG_CSTRING(0);
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char *semicolonLoc,start;
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//determine if its WKB or WKT
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semicolonLoc = strchr(str,';');
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if (semicolonLoc == NULL)
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{
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start=str[0];
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}
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else
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{
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start=semicolonLoc[1]; // one in
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}
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// this is included just for redundancy (new parser can handle wkt and wkb)
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if ( ( (start >= '0') && (start <= '9') ) ||
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( (start >= 'A') && (start <= 'F') ))
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{
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//its WKB
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//PG_RETURN_POINTER(parse_lwgeom_serialized_form(str));
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// this function handles wkt and wkb (in hex-form)
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PG_RETURN_POINTER( parse_lwgeom_wkt(str) );
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}
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else if ( (start == 'P') || (start == 'L') || (start == 'M') ||
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(start == 'G') || (start == 'p') || (start == 'l') ||
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(start == 'm') || (start == 'g'))
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{
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// its WKT
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// this function handles wkt and wkb (in hex-form)
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PG_RETURN_POINTER( parse_lwgeom_wkt(str) );
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}
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else
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{
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elog(ERROR,"couldnt determine if input lwgeom is WKB or WKT");
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PG_RETURN_NULL();
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}
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}
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// LWGEOM_out(lwgeom) --> cstring
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// output is 'SRID=#;<wkb in hex form>'
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// ie. 'SRID=-99;0101000000000000000000F03F0000000000000040'
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// WKB is machine endian
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// if SRID=-1, the 'SRID=-1;' will probably not be present.
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PG_FUNCTION_INFO_V1(LWGEOM_out);
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Datum LWGEOM_out(PG_FUNCTION_ARGS)
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{
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PG_LWGEOM *lwgeom;
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char *result;
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init_pg_func();
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lwgeom = (PG_LWGEOM *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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result = unparse_WKB(SERIALIZED_FORM(lwgeom),lwalloc,lwfree,-1);
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PG_RETURN_CSTRING(result);
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}
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// LWGEOM_to_text(lwgeom) --> text
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// output is 'SRID=#;<wkb in hex form>'
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// ie. 'SRID=-99;0101000000000000000000F03F0000000000000040'
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// WKB is machine endian
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// if SRID=-1, the 'SRID=-1;' will probably not be present.
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PG_FUNCTION_INFO_V1(LWGEOM_to_text);
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Datum LWGEOM_to_text(PG_FUNCTION_ARGS)
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{
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PG_LWGEOM *lwgeom;
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char *result;
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text *text_result;
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init_pg_func();
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lwgeom = (PG_LWGEOM *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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result = unparse_WKB(SERIALIZED_FORM(lwgeom),lwalloc,lwfree,-1);
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text_result = palloc(strlen(result)+VARHDRSZ);
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memcpy(VARDATA(text_result),result,strlen(result));
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VARATT_SIZEP(text_result) = strlen(result)+VARHDRSZ;
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pfree(result);
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PG_RETURN_POINTER(text_result);
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}
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// LWGEOMFromWKB(wkb, [SRID] )
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// NOTE: wkb is in *binary* not hex form.
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//
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// NOTE: this function is unoptimized, as it convert binary
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// form to hex form and then calls the unparser ...
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//
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PG_FUNCTION_INFO_V1(LWGEOMFromWKB);
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Datum LWGEOMFromWKB(PG_FUNCTION_ARGS)
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{
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WellKnownBinary *wkb_input;
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char *wkb_srid_hexized;
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int size_result,size_header;
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int SRID = -1;
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char sridText[100];
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char *loc;
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PG_LWGEOM *lwgeom;
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int t;
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wkb_input = (WellKnownBinary *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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if ( ( PG_NARGS()>1) && ( ! PG_ARGISNULL(1) ))
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SRID = PG_GETARG_INT32(1);
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else
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SRID = -1;
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#ifdef DEBUG
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elog(NOTICE,"LWGEOMFromWKB: entry with SRID=%i",SRID);
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#endif
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// convert WKB to hexized WKB string
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size_header = sprintf(sridText,"SRID=%i;",SRID);
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//SRID text size + wkb size (+1 = NULL term)
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size_result = size_header + 2*(wkb_input->size-4) + 1;
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wkb_srid_hexized = palloc(size_result);
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wkb_srid_hexized[0] = 0; // empty
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strcpy(wkb_srid_hexized, sridText);
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loc = wkb_srid_hexized + size_header; // points to null in "SRID=#;"
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for (t=0; t< (wkb_input->size -4); t++)
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{
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deparse_hex( ((unsigned char *) wkb_input)[4 + t], &loc[t*2]);
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}
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wkb_srid_hexized[size_result-1] = 0; // null term
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#ifdef DEBUG
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elog(NOTICE,"size_header = %i",size_header);
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elog(NOTICE,"size_result = %i", size_result);
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elog(NOTICE,"LWGEOMFromWKB :: '%s'", wkb_srid_hexized);
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#endif
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lwgeom = (PG_LWGEOM *)parse_lwgeom_wkt(wkb_srid_hexized);
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pfree(wkb_srid_hexized);
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#ifdef DEBUG
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elog(NOTICE, "LWGEOMFromWKB returning %s", unparse_WKB(SERIALIZED_FORM(lwgeom), pg_alloc, pg_free, -1));
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#endif
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PG_RETURN_POINTER(lwgeom);
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}
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// WKBFromLWGEOM(lwgeom) --> wkb
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// this will have no 'SRID=#;'
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PG_FUNCTION_INFO_V1(WKBFromLWGEOM);
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Datum WKBFromLWGEOM(PG_FUNCTION_ARGS)
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{
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PG_LWGEOM *lwgeom_input; // SRID=#;<hexized wkb>
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char *hexized_wkb_srid;
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char *hexized_wkb; // hexized_wkb_srid w/o srid
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char *result; //wkb
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int len_hexized_wkb;
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int size_result;
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char *semicolonLoc;
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int t;
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text *type;
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unsigned int byteorder=-1;
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init_pg_func();
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if ( (PG_NARGS()>1) && (!PG_ARGISNULL(1)) )
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{
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type = PG_GETARG_TEXT_P(1);
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if (VARSIZE(type) < 7)
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{
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elog(ERROR,"asbinary(geometry, <type>) - type should be 'XDR' or 'NDR'. type length is %i",VARSIZE(type) -4);
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PG_RETURN_NULL();
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}
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if ( ! strncmp(VARDATA(type), "xdr", 3) ||
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! strncmp(VARDATA(type), "XDR", 3) )
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{
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byteorder = XDR;
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}
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else
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{
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byteorder = NDR;
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}
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}
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lwgeom_input = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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hexized_wkb_srid = unparse_WKB(SERIALIZED_FORM(lwgeom_input),
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lwalloc, lwfree, byteorder);
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//elog(NOTICE, "in WKBFromLWGEOM with WKB = '%s'", hexized_wkb_srid);
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hexized_wkb = hexized_wkb_srid;
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semicolonLoc = strchr(hexized_wkb_srid,';');
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if (semicolonLoc != NULL)
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{
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hexized_wkb = (semicolonLoc+1);
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}
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//elog(NOTICE, "in WKBFromLWGEOM with WKB (with no 'SRID=#;' = '%s'", hexized_wkb);
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len_hexized_wkb = strlen(hexized_wkb);
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size_result = len_hexized_wkb/2 + 4;
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result = palloc(size_result);
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memcpy(result, &size_result,4); // size header
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// have a hexized string, want to make it binary
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for (t=0; t< (len_hexized_wkb/2); t++)
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{
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((unsigned char *) result +4)[t] = parse_hex( hexized_wkb + (t*2) );
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}
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pfree(hexized_wkb_srid);
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PG_RETURN_POINTER(result);
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}
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// puts a bbox inside the geometry
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PG_FUNCTION_INFO_V1(LWGEOM_addBBOX);
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Datum LWGEOM_addBBOX(PG_FUNCTION_ARGS)
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{
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PG_LWGEOM *lwgeom = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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PG_LWGEOM *result;
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BOX2DFLOAT4 box;
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unsigned char old_type;
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int size;
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//elog(NOTICE,"in LWGEOM_addBBOX");
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if (lwgeom_hasBBOX( lwgeom->type ) )
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{
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//elog(NOTICE,"LWGEOM_addBBOX -- already has bbox");
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// easy - already has one. Just copy!
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result = palloc (lwgeom->size);
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memcpy(result, lwgeom, lwgeom->size);
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PG_RETURN_POINTER(result);
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}
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//elog(NOTICE,"LWGEOM_addBBOX -- giving it a bbox");
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//construct new one
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getbox2d_p(SERIALIZED_FORM(lwgeom), &box);
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old_type = lwgeom->type;
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size = lwgeom->size+sizeof(BOX2DFLOAT4);
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result = palloc(size);// 16 for bbox2d
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memcpy(result,&size,4); // size
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result->type = lwgeom_makeType_full(
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TYPE_HASZ(old_type),
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TYPE_HASM(old_type),
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lwgeom_hasSRID(old_type), lwgeom_getType(old_type), 1);
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// copy in bbox
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memcpy(result->data, &box, sizeof(BOX2DFLOAT4));
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//lwnotice("result->type hasbbox: %d", TYPE_HASBBOX(result->type));
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//elog(NOTICE,"LWGEOM_addBBOX -- about to copy serialized form");
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// everything but the type and length
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memcpy(result->data+sizeof(BOX2DFLOAT4), lwgeom->data, lwgeom->size-5);
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PG_RETURN_POINTER(result);
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}
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// removes a bbox from a geometry
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PG_FUNCTION_INFO_V1(LWGEOM_dropBBOX);
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Datum LWGEOM_dropBBOX(PG_FUNCTION_ARGS)
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{
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PG_LWGEOM *lwgeom = (PG_LWGEOM *)PG_DETOAST_DATUM(PG_GETARG_DATUM(0));
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PG_LWGEOM *result;
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unsigned char old_type;
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int size;
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//elog(NOTICE,"in LWGEOM_dropBBOX");
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if (!lwgeom_hasBBOX( lwgeom->type ) )
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{
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//elog(NOTICE,"LWGEOM_dropBBOX -- doesnt have a bbox already");
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result = palloc (lwgeom->size);
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memcpy(result, lwgeom, lwgeom->size);
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PG_RETURN_POINTER(result);
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}
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//elog(NOTICE,"LWGEOM_dropBBOX -- dropping the bbox");
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//construct new one
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old_type = lwgeom->type;
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size = lwgeom->size-sizeof(BOX2DFLOAT4);
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result = palloc(size);// 16 for bbox2d
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memcpy(result,&size,4); // size
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result->type = lwgeom_makeType_full(
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TYPE_HASZ(old_type),
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TYPE_HASM(old_type),
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lwgeom_hasSRID(old_type), lwgeom_getType(old_type), 0);
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// everything but the type and length
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memcpy(result->data, lwgeom->data+sizeof(BOX2DFLOAT4), lwgeom->size-5-sizeof(BOX2DFLOAT4));
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PG_RETURN_POINTER(result);
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}
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//for the wkt parser
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void elog_ERROR(const char* string)
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{
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elog(ERROR,string);
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}
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// parse WKT input
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// parse_WKT_lwgeom(TEXT) -> LWGEOM
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PG_FUNCTION_INFO_V1(parse_WKT_lwgeom);
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Datum parse_WKT_lwgeom(PG_FUNCTION_ARGS)
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{
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const char *wkt_input = (char *) PG_DETOAST_DATUM(PG_GETARG_DATUM(0)); // text
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char *serialized_form; //with length
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char *wkt;
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int wkt_size ;
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init_pg_func();
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wkt_size = (*(int*) wkt_input) -4; // actual letters
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wkt = palloc( wkt_size+1); //+1 for null
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memcpy(wkt, wkt_input+4, wkt_size );
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wkt[wkt_size] = 0; // null term
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//elog(NOTICE,"in parse_WKT_lwgeom");
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//elog(NOTICE,"in parse_WKT_lwgeom with input: '%s'",wkt);
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serialized_form = parse_lwg((const char *)wkt, (allocator)lwalloc, (report_error)elog_ERROR);
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//elog(NOTICE,"parse_WKT_lwgeom:: finished parse");
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pfree (wkt);
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if (serialized_form == NULL)
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elog(ERROR,"parse_WKT:: couldnt parse!");
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// printBYTES(serialized_form+4,*((int*) serialized_form)-4);
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// result = palloc( (*((int*) serialized_form)));
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// memcpy(result, serialized_form, *((int*) serialized_form));
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// free(serialized_form);
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// PG_RETURN_POINTER(result);
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//PG_RETURN_NULL();
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PG_RETURN_POINTER(serialized_form);
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}
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#if USE_VERSION > 73
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/*
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* This function must advance the StringInfo.cursor pointer
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* and leave it at the end of StringInfo.buf. If it fails
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* to do so the backend will raise an exception with message:
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* ERROR: incorrect binary data format in bind parameter #
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*
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*/
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PG_FUNCTION_INFO_V1(LWGEOM_recv);
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Datum LWGEOM_recv(PG_FUNCTION_ARGS)
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{
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StringInfo buf = (StringInfo) PG_GETARG_POINTER(0);
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bytea *wkb;
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PG_LWGEOM *result;
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#ifdef DEBUG
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elog(NOTICE, "LWGEOM_recv start");
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#endif
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/* Add VARLENA size info to make it a valid varlena object */
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wkb = (bytea *)palloc(buf->len+VARHDRSZ);
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VARATT_SIZEP(wkb) = buf->len+VARHDRSZ;
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memcpy(VARATT_DATA(wkb), buf->data, buf->len);
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#ifdef DEBUG
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elog(NOTICE, "LWGEOM_recv calling LWGEOMFromWKB");
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#endif
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/* Call LWGEOM_from_bytea function... */
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result = (PG_LWGEOM *)DatumGetPointer(DirectFunctionCall1(
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LWGEOMFromWKB, PointerGetDatum(wkb)));
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#ifdef DEBUG
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elog(NOTICE, "LWGEOM_recv advancing StringInfo buffer");
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#endif
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#ifdef DEBUG
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elog(NOTICE, "LWGEOM_from_bytea returned %s", unparse_WKB(SERIALIZED_FORM(result),pg_alloc,pg_free,-1));
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#endif
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/* Set cursor to the end of buffer (so the backend is happy) */
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buf->cursor = buf->len;
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#ifdef DEBUG
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elog(NOTICE, "LWGEOM_recv returning");
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#endif
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PG_RETURN_POINTER(result);
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}
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PG_FUNCTION_INFO_V1(LWGEOM_send);
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Datum LWGEOM_send(PG_FUNCTION_ARGS)
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{
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bytea *result;
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#ifdef DEBUG
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elog(NOTICE, "LWGEOM_send called");
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#endif
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result = (bytea *)DatumGetPointer(DirectFunctionCall1(
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WKBFromLWGEOM, PG_GETARG_DATUM(0)));
|
|
|
|
PG_RETURN_POINTER(result);
|
|
}
|
|
|
|
PG_FUNCTION_INFO_V1(LWGEOM_to_bytea);
|
|
Datum LWGEOM_to_bytea(PG_FUNCTION_ARGS)
|
|
{
|
|
bytea *result;
|
|
|
|
#ifdef DEBUG
|
|
elog(NOTICE, "LWGEOM_to_bytea called");
|
|
#endif
|
|
|
|
result = (bytea *)DatumGetPointer(DirectFunctionCall1(
|
|
WKBFromLWGEOM, PG_GETARG_DATUM(0)));
|
|
|
|
PG_RETURN_POINTER(result);
|
|
}
|
|
|
|
PG_FUNCTION_INFO_V1(LWGEOM_from_bytea);
|
|
Datum LWGEOM_from_bytea(PG_FUNCTION_ARGS)
|
|
{
|
|
PG_LWGEOM *result;
|
|
|
|
#ifdef DEBUG
|
|
elog(NOTICE, "LWGEOM_from_bytea start");
|
|
#endif
|
|
|
|
result = (PG_LWGEOM *)DatumGetPointer(DirectFunctionCall1(
|
|
LWGEOMFromWKB, PG_GETARG_DATUM(0)));
|
|
|
|
PG_RETURN_POINTER(result);
|
|
}
|
|
|
|
#endif // USE_VERSION > 73
|