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postgis/liblwgeom/lwgunparse.c

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/*
* Written by Ralph Mason ralph.mason<at>telogis.com
*
* Copyright Telogis 2004
* www.telogis.com
*
* $Id$
*/
#include <string.h>
#include <math.h>
#include <stdio.h>
/* Solaris9 does not provide stdint.h */
/* #include <stdint.h> */
#include <inttypes.h>
#include "liblwgeom.h"
#include "wktparse.h"
/*-- Typedefs ---------------------------------------------- */
typedef uint32_t int4;
typedef uchar* (*outfunc)(uchar*,int);
typedef uchar* (*outwkbfunc)(uchar*);
/*-- Prototypes -------------------------------------------- */
void ensure(int chars);
void to_end(void);
void write_str(const char* str);
void write_double(double val);
void write_int(int i);
int4 read_int(uchar** geom);
double read_double(uchar** geom);
uchar* output_point(uchar* geom,int supress);
uchar* output_single(uchar* geom,int supress);
uchar* output_collection(uchar* geom,outfunc func,int supress);
uchar* output_line_collection(uchar* geom,outfunc func,int supress);
uchar* output_polygon_collection(uchar* geom,int suppress);
uchar* output_polygon_ring_collection(uchar* geom,outfunc func,int supress);
uchar* output_triangle_collection(uchar* geom,outfunc func,int supress);
uchar* output_circstring_collection(uchar* geom,outfunc func,int supress);
uchar* output_curvepoly(uchar* geom, int supress);
uchar* output_multipoint(uchar* geom,int suppress);
uchar* output_compound(uchar* geom, int suppress);
uchar* output_multisurface(uchar* geom, int suppress);
void write_wkb_hex_bytes(uchar* ptr, uint32 cnt, size_t size);
void write_wkb_bin_bytes(uchar* ptr, uint32 cnt, size_t size);
void write_wkb_bin_flip_bytes(uchar* ptr, uint32 cnt, size_t size);
void write_wkb_hex_flip_bytes(uchar* ptr, uint32 cnt, size_t size);
void write_wkb_int(int i);
uchar* output_wkb_collection(uchar* geom,outwkbfunc func);
uchar* output_wkb_polygon_collection(uchar* geom);
uchar* output_wkb_polygon_ring_collection(uchar* geom,outwkbfunc func);
uchar* output_wkb_triangle_collection(uchar* geom,outwkbfunc func);
uchar* output_wkb_line_collection(uchar* geom,outwkbfunc func);
uchar* output_wkb_circstring_collection(uchar* geom,outwkbfunc func);
uchar* output_wkb_point(uchar* geom);
uchar* output_wkb(uchar* geom);
/*-- Globals ----------------------------------------------- */
static int unparser_ferror_occured;
static int dims;
static allocator local_malloc;
static freeor local_free;
static char* out_start;
static char* out_pos;
static int len;
static uchar endianbyte;
void (*write_wkb_bytes)(uchar* ptr,uint32 cnt,size_t size);
/*
* Unparser current instance check flags - a bitmap of flags that determine which checks are enabled during the current unparse
* (see liblwgeom.h for the related PARSER_CHECK constants)
*/
int current_unparser_check_flags;
/*
* Unparser current instance result structure - the result structure being used for the current unparse
*/
LWGEOM_UNPARSER_RESULT *current_lwg_unparser_result;
/*
* Unparser error messages
*
* IMPORTANT: Make sure the order of these messages matches the UNPARSER_ERROR constants in liblwgeom.h!
* The 0th element should always be empty since it is unused (error constants start from -1)
*/
const char *unparser_error_messages[] =
{
"",
"geometry requires more points",
"geometry must have an odd number of points",
"geometry contains non-closed rings"
};
/* Macro to return the error message and the current position within WKT */
#define LWGEOM_WKT_UNPARSER_ERROR(errcode) \
do { \
if (!unparser_ferror_occured) { \
unparser_ferror_occured = -1 * errcode; \
current_lwg_unparser_result->message = unparser_error_messages[errcode]; \
current_lwg_unparser_result->errlocation = (out_pos - out_start); \
} \
} while (0);
/* Macro to return the error message and the current position within WKB */
#define LWGEOM_WKB_UNPARSER_ERROR(errcode) \
do { \
if (!unparser_ferror_occured) { \
unparser_ferror_occured = -1 * errcode; \
current_lwg_unparser_result->message = unparser_error_messages[errcode]; \
current_lwg_unparser_result->errlocation = (out_pos - out_start); \
} \
} while (0);
/*---------------------------------------------------------- */
/*
* Ensure there is enough space for chars bytes.
* Reallocate memory is this is not the case.
*/
void
ensure(int chars)
{
int pos = out_pos - out_start;
if ( (pos + chars) >= len )
{
char* newp =(char*)local_malloc(len*2);
memcpy(newp,out_start,len);
local_free(out_start);
out_start = newp;
out_pos = newp + pos;
len *=2;
}
}
void
to_end(void)
{
while (*out_pos)
{
out_pos++;
}
}
void
write_str(const char* str)
{
ensure(32);
strcpy(out_pos,str);
to_end();
}
void
write_double(double val)
{
ensure(32);
sprintf(out_pos,"%.15g",val);
to_end();
}
void
write_int(int i)
{
ensure(32);
sprintf(out_pos,"%i",i);
to_end();
}
int4
read_int(uchar** geom)
{
int4 ret;
#ifdef SHRINK_INTS
if ( getMachineEndian() == NDR )
{
if ( (**geom)& 0x01)
{
ret = **geom >>1;
(*geom)++;
return ret;
}
}
else
{
if ( (**geom)& 0x80)
{
ret = **geom & ~0x80;
(*geom)++;
return ret;
}
}
#endif
memcpy(&ret,*geom,4);
#ifdef SHRINK_INTS
if ( getMachineEndian() == NDR )
{
ret >>= 1;
}
#endif
(*geom)+=4;
return ret;
}
double round(double);
double read_double(uchar** geom)
{
double ret;
memcpy(&ret, *geom, 8);
(*geom)+=8;
return ret;
}
uchar *
output_point(uchar* geom,int supress)
{
int i;
for ( i = 0 ; i < dims ; i++ )
{
write_double(read_double(&geom));
if (i +1 < dims )
write_str(" ");
}
return geom;
}
uchar *
output_single(uchar* geom,int supress)
{
write_str("(");
geom=output_point(geom,supress);
write_str(")");
return geom;
}
/* Output a standard collection */
uchar *
output_collection(uchar* geom,outfunc func,int supress)
{
int cnt = read_int(&geom);
if ( cnt == 0 )
{
write_str(" EMPTY");
}
else
{
write_str("(");
while (cnt--)
{
geom=func(geom,supress);
if ( cnt )
{
write_str(",");
}
}
write_str(")");
}
return geom;
}
/* Output a set of LINESTRING points */
uchar *
output_line_collection(uchar* geom,outfunc func,int supress)
{
int cnt = read_int(&geom);
int orig_cnt = cnt;
if ( cnt == 0 )
{
write_str(" EMPTY");
}
else
{
write_str("(");
while (cnt--)
{
geom=func(geom,supress);
if ( cnt )
{
write_str(",");
}
}
write_str(")");
}
/* Ensure that LINESTRING has a minimum of 2 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt < 2)
LWGEOM_WKT_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
return geom;
}
uchar *
output_triangle_collection(uchar* geom,outfunc func,int supress)
{
int cnt = read_int(&geom);
int orig_cnt = cnt;
if ( cnt == 0 )
{
write_str(" EMPTY");
}
else
{
write_str("((");
while (cnt--)
{
geom=func(geom,supress);
if ( cnt )
{
write_str(",");
}
}
write_str("))");
}
/* Ensure that TRIANGLE has 4 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt != 4)
LWGEOM_WKT_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
return geom;
}
/* Output an individual ring from a POLYGON */
uchar *
output_polygon_ring_collection(uchar* geom,outfunc func,int supress)
{
uchar *temp;
int dimcount;
double *first_point;
double *last_point;
int cnt;
int orig_cnt;
first_point = lwalloc(dims * sizeof(double));
last_point = lwalloc(dims * sizeof(double));
cnt = read_int(&geom);
orig_cnt = cnt;
if ( cnt == 0 )
{
write_str(" EMPTY");
}
else
{
write_str("(");
/* Store the first point of the ring (use a temp var since read_double alters
the pointer after use) */
temp = geom;
dimcount = 0;
while (dimcount < dims)
{
first_point[dimcount] = read_double(&temp);
dimcount++;
}
while (cnt--)
{
geom=func(geom,supress);
if ( cnt )
{
write_str(",");
}
}
write_str(")");
/* Store the last point of the ring (note: we will have moved past it, so we
need to count backwards) */
temp = geom - sizeof(double) * dims;
dimcount = 0;
while (dimcount < dims)
{
last_point[dimcount] = read_double(&temp);
dimcount++;
}
/* Check if they are the same...
WARNING: due to various GEOS bugs related to producing rings with incorrect
3rd dimensions, the closure check here for outgoing geometries only checks on 2
dimensions. This is currently different to the parser! */
if (
(first_point[0] != last_point[0] || first_point[1] != last_point[1] ) &&
(current_unparser_check_flags & PARSER_CHECK_CLOSURE))
{
LWGEOM_WKT_UNPARSER_ERROR(UNPARSER_ERROR_UNCLOSED);
}
/* Ensure that POLYGON has a minimum of 4 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt < 4)
{
LWGEOM_WKT_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
}
}
lwfree(first_point);
lwfree(last_point);
return geom;
}
/* Ouput the points from a CIRCULARSTRING */
uchar *
output_circstring_collection(uchar* geom,outfunc func,int supress)
{
int cnt = read_int(&geom);
int orig_cnt = cnt;
if ( cnt == 0 )
{
write_str(" EMPTY");
}
else
{
write_str("(");
while (cnt--)
{
geom=func(geom,supress);
if ( cnt )
{
write_str(",");
}
}
write_str(")");
}
/* Ensure that a CIRCULARSTRING has a minimum of 3 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt < 3)
{
LWGEOM_WKT_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
}
/* Ensure that a CIRCULARSTRING has an odd number of points */
if ((current_unparser_check_flags & PARSER_CHECK_ODD) && orig_cnt % 2 != 1)
{
LWGEOM_WKT_UNPARSER_ERROR(UNPARSER_ERROR_ODDPOINTS);
}
return geom;
}
/* Output a POLYGON consisting of a number of rings */
uchar *
output_polygon_collection(uchar* geom,int suppress)
{
return output_polygon_ring_collection(geom,output_point,suppress);
}
uchar *output_wkt(uchar* geom, int supress);
/* special case for multipoint to supress extra brackets */
uchar *output_multipoint(uchar* geom,int suppress)
{
uchar type = *geom & 0x0f;
if ( type == POINTTYPE )
return output_point(++geom,suppress);
return output_wkt(geom,suppress);
}
/* Special case for compound curves: suppress the LINESTRING prefix from a curve if it appears as
a component of a COMPOUNDCURVE, but not CIRCULARSTRING */
uchar *output_compound(uchar* geom, int suppress)
{
uchar type;
LWDEBUG(2, "output_compound called.");
type=*geom;
switch (TYPE_GETTYPE(type))
{
case LINETYPE:
geom = output_wkt(geom,2);
break;
case CIRCSTRINGTYPE:
geom = output_wkt(geom,1);
break;
}
return geom;
}
/*
* Supress linestring but not circularstring and correctly handle compoundcurve
*/
uchar *output_curvepoly(uchar* geom, int supress)
{
unsigned type;
type = *geom++;
LWDEBUG(2, "output_curvepoly.");
switch (TYPE_GETTYPE(type))
{
case LINETYPE:
geom = output_collection(geom,output_point,0);
break;
case CIRCSTRINGTYPE:
write_str("CIRCULARSTRING");
geom = output_circstring_collection(geom,output_point,1);
break;
case COMPOUNDTYPE:
write_str("COMPOUNDCURVE");
geom = output_collection(geom,output_compound,1);
break;
}
return geom;
}
/* Special case for multisurfaces: suppress the POLYGON prefix from a surface if it appears as
a component of a MULTISURFACE, but not CURVEPOLYGON */
uchar *output_multisurface(uchar* geom, int suppress)
{
uchar type;
LWDEBUG(2, "output_multisurface called.");
type=*geom;
switch (TYPE_GETTYPE(type))
{
case POLYGONTYPE:
geom = output_wkt(geom,2);
break;
case CURVEPOLYTYPE:
geom = output_wkt(geom,1);
break;
}
return geom;
}
/*
* Suppress=0 -- write TYPE, M, coords
* Suppress=1 -- write TYPE, coords
* Suppress=2 -- write only coords
*/
uchar *
output_wkt(uchar* geom, int supress)
{
uchar type=*geom++;
char writeM=0;
dims = TYPE_NDIMS(type); /* ((type & 0x30) >> 4)+2; */
LWDEBUG(2, "output_wkt called.");
if ( ! supress && !TYPE_HASZ(type) && TYPE_HASM(type) ) writeM=1;
/* Skip the bounding box if there is one */
if ( TYPE_HASBBOX(type) )
{
geom+=16;
}
if ( TYPE_HASSRID(type) )
{
write_str("SRID=");
write_int(read_int(&geom));
write_str(";");
}
switch (TYPE_GETTYPE(type))
{
case POINTTYPE:
if ( supress < 2 )
{
if (writeM) write_str("POINTM");
else write_str("POINT");
}
geom=output_single(geom,0);
break;
case LINETYPE:
if ( supress < 2 )
{
if (writeM) write_str("LINESTRINGM");
else write_str("LINESTRING");
}
geom = output_line_collection(geom,output_point,0);
break;
case CIRCSTRINGTYPE:
if ( supress < 2 )
{
if (writeM) write_str("CIRCULARSTRINGM");
else write_str("CIRCULARSTRING");
}
geom = output_circstring_collection(geom,output_point,0);
break;
case POLYGONTYPE:
if ( supress < 2 )
{
if (writeM) write_str("POLYGONM");
else write_str("POLYGON");
}
geom = output_collection(geom,output_polygon_collection,0);
break;
case TRIANGLETYPE:
if ( supress < 2 )
{
if (writeM) write_str("TRIANGLEM");
else write_str("TRIANGLE");
}
geom = output_triangle_collection(geom,output_point,0);
break;
case COMPOUNDTYPE:
if ( supress < 2 )
{
if (writeM) write_str("COMPOUNDCURVEM");
else write_str("COMPOUNDCURVE");
}
geom = output_collection(geom, output_compound,1);
break;
case CURVEPOLYTYPE:
if (supress < 2)
{
if (writeM) write_str("CURVEPOLYGONM");
else write_str("CURVEPOLYGON");
}
geom = output_collection(geom, output_curvepoly,0);
break;
case MULTIPOINTTYPE:
if ( supress < 2 )
{
if (writeM) write_str("MULTIPOINTM");
else write_str("MULTIPOINT");
}
geom = output_collection(geom,output_multipoint,2);
break;
case MULTILINETYPE:
if ( supress < 2 )
{
if (writeM) write_str("MULTILINESTRINGM");
else write_str("MULTILINESTRING");
}
geom = output_collection(geom,output_wkt,2);
break;
case MULTICURVETYPE:
if ( supress < 2 )
{
if (writeM) write_str("MULTICURVEM");
else write_str("MULTICURVE");
}
geom = output_collection(geom,output_compound,2);
break;
case MULTIPOLYGONTYPE:
if ( supress < 2 )
{
if (writeM) write_str("MULTIPOLYGONM");
else write_str("MULTIPOLYGON");
}
geom = output_collection(geom,output_wkt,2);
break;
case MULTISURFACETYPE:
if ( supress < 2)
{
if (writeM) write_str("MULTISURFACEM");
else write_str("MULTISURFACE");
}
geom = output_collection(geom,output_multisurface,2);
break;
case POLYHEDRALSURFACETYPE:
if ( supress < 2)
{
if (writeM) write_str("POLYHEDRALSURFACEM");
else write_str("POLYHEDRALSURFACE");
}
geom = output_collection(geom,output_wkt,2);
break;
case TINTYPE:
if ( supress < 2)
{
if (writeM) write_str("TINM");
else write_str("TIN");
}
geom = output_collection(geom,output_wkt,2);
break;
case COLLECTIONTYPE:
if ( supress < 2 )
{
if (writeM) write_str("GEOMETRYCOLLECTIONM");
else write_str("GEOMETRYCOLLECTION");
}
geom = output_collection(geom,output_wkt,1);
break;
}
return geom;
}
int
unparse_WKT(LWGEOM_UNPARSER_RESULT *lwg_unparser_result, uchar* serialized, allocator alloc, freeor free, int flags)
{
LWDEBUGF(2, "unparse_WKT called with parser flags %d.", flags);
if (serialized==NULL)
return 0;
/* Setup the inital parser flags and empty the return struct */
current_lwg_unparser_result = lwg_unparser_result;
current_unparser_check_flags = flags;
lwg_unparser_result->wkoutput = NULL;
lwg_unparser_result->size = 0;
lwg_unparser_result->serialized_lwgeom = serialized;
unparser_ferror_occured = 0;
local_malloc=alloc;
local_free=free;
len = 128;
out_start = out_pos = alloc(len);
output_wkt(serialized, 0);
/* Store the result in the struct */
lwg_unparser_result->wkoutput = out_start;
lwg_unparser_result->size = strlen(out_start);
return unparser_ferror_occured;
}
static char outchr[]=
{
"0123456789ABCDEF"
};
/* Write HEX bytes flipping */
void
write_wkb_hex_flip_bytes(uchar* ptr, uint32 cnt, size_t size)
{
uint32 bc; /* byte count */
ensure(cnt*2*size);
while (cnt--)
{
for (bc=size; bc; bc--)
{
*out_pos++ = outchr[ptr[bc-1]>>4];
*out_pos++ = outchr[ptr[bc-1]&0x0F];
}
ptr+=size;
}
}
/* Write HEX bytes w/out flipping */
void
write_wkb_hex_bytes(uchar* ptr, uint32 cnt, size_t size)
{
uint32 bc; /* byte count */
ensure(cnt*2*size);
while (cnt--)
{
for (bc=0; bc<size; bc++)
{
*out_pos++ = outchr[ptr[bc]>>4];
*out_pos++ = outchr[ptr[bc]&0x0F];
}
ptr+=size;
}
}
/* Write BIN bytes flipping */
void
write_wkb_bin_flip_bytes(uchar* ptr, uint32 cnt, size_t size)
{
uint32 bc; /* byte count */
ensure(cnt*size);
while (cnt--)
{
for (bc=size; bc; bc--)
*out_pos++ = ptr[bc-1];
ptr+=size;
}
}
/* Write BIN bytes w/out flipping */
void
write_wkb_bin_bytes(uchar* ptr, uint32 cnt, size_t size)
{
uint32 bc; /* byte count */
ensure(cnt*size);
/* Could just use a memcpy here ... */
while (cnt--)
{
for (bc=0; bc<size; bc++)
*out_pos++ = ptr[bc];
ptr+=size;
}
}
uchar *
output_wkb_point(uchar* geom)
{
write_wkb_bytes(geom,dims,8);
return geom + (8*dims);
}
void
write_wkb_int(int i)
{
write_wkb_bytes((uchar*)&i,1,4);
}
/* Output a standard collection */
uchar *
output_wkb_collection(uchar* geom,outwkbfunc func)
{
int cnt = read_int(&geom);
LWDEBUGF(2, "output_wkb_collection: %d iterations loop", cnt);
write_wkb_int(cnt);
while (cnt--) geom=func(geom);
return geom;
}
/* Output a set of LINESTRING points */
uchar *
output_wkb_line_collection(uchar* geom,outwkbfunc func)
{
int cnt = read_int(&geom);
int orig_cnt = cnt;
LWDEBUGF(2, "output_wkb_line_collection: %d iterations loop", cnt);
write_wkb_int(cnt);
while (cnt--) geom=func(geom);
/* Ensure that LINESTRING has a minimum of 2 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt < 2)
{
LWGEOM_WKB_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
}
return geom;
}
/* Output an individual ring from a POLYGON */
uchar *
output_wkb_polygon_ring_collection(uchar* geom,outwkbfunc func)
{
uchar *temp;
int dimcount;
double *first_point;
double *last_point;
int cnt;
int orig_cnt;
first_point = lwalloc(dims * sizeof(double));
last_point = lwalloc(dims * sizeof(double));
cnt = read_int(&geom);
orig_cnt = cnt;
LWDEBUGF(2, "output_wkb_polygon_ring_collection: %d iterations loop", cnt);
write_wkb_int(cnt);
/* Store the first point of the ring (use a temp var since read_double alters
the pointer after use) */
temp = geom;
dimcount = 0;
while (dimcount < dims)
{
first_point[dimcount] = read_double(&temp);
dimcount++;
}
while (cnt--) geom=func(geom);
/* Store the last point of the ring (note: we will have moved past it, so we
need to count backwards) */
temp = geom - sizeof(double) * dims;
dimcount = 0;
while (dimcount < dims)
{
last_point[dimcount] = read_double(&temp);
dimcount++;
}
/* Check if they are the same... */
if (((first_point[0] != last_point[0]) ||
(first_point[1] != last_point[1])) &&
(current_unparser_check_flags & PARSER_CHECK_CLOSURE))
{
LWGEOM_WKB_UNPARSER_ERROR(UNPARSER_ERROR_UNCLOSED);
}
/* Ensure that POLYGON has a minimum of 4 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt < 4)
{
LWGEOM_WKB_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
}
lwfree(first_point);
lwfree(last_point);
return geom;
}
/* Output a POLYGON consisting of a number of rings */
uchar *
output_wkb_polygon_collection(uchar* geom)
{
LWDEBUG(2, "output_wkb_polygon_collection");
return output_wkb_polygon_ring_collection(geom,output_wkb_point);
}
/* Output a set of TRIANGLE points */
uchar *
output_wkb_triangle_collection(uchar* geom,outwkbfunc func)
{
int cnt = read_int(&geom);
int orig_cnt = cnt;
LWDEBUGF(2, "output_wkb_triangle_collection: %d iterations loop", cnt);
write_wkb_int(cnt);
while (cnt--) geom=func(geom);
/* Ensure that TRIANGLE has exactly 4 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt !=4)
{
LWGEOM_WKB_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
}
return geom;
}
/* Output an individual ring from a POLYGON */
/* Ouput the points from a CIRCULARSTRING */
uchar *
output_wkb_circstring_collection(uchar* geom,outwkbfunc func)
{
int cnt = read_int(&geom);
int orig_cnt = cnt;
LWDEBUGF(2, "output_wkb_curve_collection: %d iterations loop", cnt);
write_wkb_int(cnt);
while (cnt--) geom=func(geom);
/* Ensure that a CIRCULARSTRING has a minimum of 3 points */
if ((current_unparser_check_flags & PARSER_CHECK_MINPOINTS) && orig_cnt < 3)
{
LWGEOM_WKB_UNPARSER_ERROR(UNPARSER_ERROR_MOREPOINTS);
}
/* Ensure that a CIRCULARSTRING has an odd number of points */
if ((current_unparser_check_flags & PARSER_CHECK_ODD) && orig_cnt % 2 != 1)
{
LWGEOM_WKB_UNPARSER_ERROR(UNPARSER_ERROR_ODDPOINTS);
}
return geom;
}
uchar *
output_wkb(uchar* geom)
{
uchar type=*geom++;
int4 wkbtype;
dims = TYPE_NDIMS(type);
LWDEBUGF(2, "output_wkb: dims set to %d", dims);
/* Skip the bounding box */
if ( TYPE_HASBBOX(type) )
{
geom+=16;
}
wkbtype = TYPE_GETTYPE(type);
if ( TYPE_HASZ(type) )
wkbtype |= WKBZOFFSET;
if ( TYPE_HASM(type) )
wkbtype |= WKBMOFFSET;
if ( TYPE_HASSRID(type) )
{
wkbtype |= WKBSRIDFLAG;
}
/* Write byteorder (as from WKB specs...) */
write_wkb_bytes(&endianbyte,1,1);
write_wkb_int(wkbtype);
if ( TYPE_HASSRID(type) )
{
write_wkb_int(read_int(&geom));
}
switch (TYPE_GETTYPE(type))
{
case POINTTYPE:
geom=output_wkb_point(geom);
break;
case LINETYPE:
geom=output_wkb_line_collection(geom,output_wkb_point);
break;
case CIRCSTRINGTYPE:
geom=output_wkb_circstring_collection(geom,output_wkb_point);
break;
case POLYGONTYPE:
geom=output_wkb_collection(geom,output_wkb_polygon_collection);
break;
case TRIANGLETYPE:
geom=output_wkb_triangle_collection(geom,output_wkb_point);
break;
case COMPOUNDTYPE:
geom=output_wkb_collection(geom,output_wkb);
break;
case CURVEPOLYTYPE:
geom=output_wkb_collection(geom,output_wkb);
break;
case MULTICURVETYPE:
case MULTISURFACETYPE:
case MULTIPOINTTYPE:
case MULTILINETYPE:
case MULTIPOLYGONTYPE:
case POLYHEDRALSURFACETYPE:
case TINTYPE:
case COLLECTIONTYPE:
geom = output_wkb_collection(geom,output_wkb);
break;
}
return geom;
}
int
unparse_WKB(LWGEOM_UNPARSER_RESULT *lwg_unparser_result, uchar* serialized, allocator alloc, freeor free, int flags, char endian, uchar hex)
{
LWDEBUGF(2, "unparse_WKB(%p,...) called with parser flags %d", serialized, flags);
if (serialized==0)
return 0;
/* Setup the inital parser flags and empty the return struct */
current_lwg_unparser_result = lwg_unparser_result;
current_unparser_check_flags = flags;
lwg_unparser_result->wkoutput = NULL;
lwg_unparser_result->size = 0;
lwg_unparser_result->serialized_lwgeom = serialized;
unparser_ferror_occured = 0;
local_malloc=alloc;
local_free=free;
len = 128;
out_start = out_pos = alloc(len);
if ( endian == (char)-1 )
{
endianbyte = getMachineEndian();
if ( hex ) write_wkb_bytes = write_wkb_hex_bytes;
else write_wkb_bytes = write_wkb_bin_bytes;
}
else
{
endianbyte = endian;
if ( endianbyte != getMachineEndian() )
{
if ( hex ) write_wkb_bytes = write_wkb_hex_flip_bytes;
else write_wkb_bytes = write_wkb_bin_flip_bytes;
}
else
{
if ( hex ) write_wkb_bytes = write_wkb_hex_bytes;
else write_wkb_bytes = write_wkb_bin_bytes;
}
}
output_wkb(serialized);
if ( hex )
{
ensure(1);
*out_pos=0;
}
/* Store the result in the struct */
lwg_unparser_result->wkoutput = out_start;
lwg_unparser_result->size = (out_pos-out_start);
return unparser_ferror_occured;
}
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