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postgis/loader/shpopen.c

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/******************************************************************************
* $Id$
*
* Project: Shapelib
* Purpose: Implementation of core Shapefile read/write functions.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, 2001, Frank Warmerdam
* Copyright (c) 2011-2019, Even Rouault <even dot rouault at spatialys.com>
*
* This software is available under the following "MIT Style" license,
* or at the option of the licensee under the LGPL (see COPYING). This
* option is discussed in more detail in shapelib.html.
*
* --
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
******************************************************************************/
#include "shapefil.h"
#include <math.h>
#include <limits.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <errno.h>
SHP_CVSID("$Id$")
typedef unsigned char uchar;
#if UINT_MAX == 65535
typedef unsigned long int32;
#else
typedef unsigned int int32;
#endif
#ifndef FALSE
# define FALSE 0
# define TRUE 1
#endif
#define ByteCopy( a, b, c ) memcpy( b, a, c )
#ifndef MAX
# define MIN(a,b) ((a<b) ? a : b)
# define MAX(a,b) ((a>b) ? a : b)
#endif
#ifndef USE_CPL
#if defined(_MSC_VER)
# if _MSC_VER < 1900
# define snprintf _snprintf
# endif
#elif defined(WIN32) || defined(_WIN32)
# ifndef snprintf
# define snprintf _snprintf
# endif
#endif
#endif
#ifndef CPL_UNUSED
#if defined(__GNUC__) && __GNUC__ >= 4
# define CPL_UNUSED __attribute((__unused__))
#else
# define CPL_UNUSED
#endif
#endif
#if defined(CPL_LSB)
#define bBigEndian FALSE
#elif defined(CPL_MSB)
#define bBigEndian TRUE
#else
static int bBigEndian;
#endif
#ifdef __cplusplus
#define STATIC_CAST(type,x) static_cast<type>(x)
#define SHPLIB_NULLPTR nullptr
#else
#define STATIC_CAST(type,x) ((type)(x))
#define SHPLIB_NULLPTR NULL
#endif
/************************************************************************/
/* SwapWord() */
/* */
/* Swap a 2, 4 or 8 byte word. */
/************************************************************************/
static void SwapWord( int length, void * wordP )
{
int i;
uchar temp;
for( i=0; i < length/2; i++ )
{
temp = STATIC_CAST(uchar*, wordP)[i];
STATIC_CAST(uchar*, wordP)[i] = STATIC_CAST(uchar*, wordP)[length-i-1];
STATIC_CAST(uchar*, wordP)[length-i-1] = temp;
}
}
/************************************************************************/
/* SfRealloc() */
/* */
/* A realloc cover function that will access a NULL pointer as */
/* a valid input. */
/************************************************************************/
static void * SfRealloc( void * pMem, int nNewSize )
{
if( pMem == SHPLIB_NULLPTR )
return malloc(nNewSize);
else
return realloc(pMem,nNewSize);
}
/************************************************************************/
/* SHPWriteHeader() */
/* */
/* Write out a header for the .shp and .shx files as well as the */
/* contents of the index (.shx) file. */
/************************************************************************/
void SHPAPI_CALL SHPWriteHeader( SHPHandle psSHP )
{
uchar abyHeader[100] = { 0 };
int i;
int32 i32;
double dValue;
int32 *panSHX;
if (psSHP->fpSHX == SHPLIB_NULLPTR)
{
psSHP->sHooks.Error( "SHPWriteHeader failed : SHX file is closed");
return;
}
/* -------------------------------------------------------------------- */
/* Prepare header block for .shp file. */
/* -------------------------------------------------------------------- */
abyHeader[2] = 0x27; /* magic cookie */
abyHeader[3] = 0x0a;
i32 = psSHP->nFileSize/2; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
i32 = 1000; /* version */
ByteCopy( &i32, abyHeader+28, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+28 );
i32 = psSHP->nShapeType; /* shape type */
ByteCopy( &i32, abyHeader+32, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+32 );
dValue = psSHP->adBoundsMin[0]; /* set bounds */
ByteCopy( &dValue, abyHeader+36, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+36 );
dValue = psSHP->adBoundsMin[1];
ByteCopy( &dValue, abyHeader+44, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+44 );
dValue = psSHP->adBoundsMax[0];
ByteCopy( &dValue, abyHeader+52, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+52 );
dValue = psSHP->adBoundsMax[1];
ByteCopy( &dValue, abyHeader+60, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+60 );
dValue = psSHP->adBoundsMin[2]; /* z */
ByteCopy( &dValue, abyHeader+68, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+68 );
dValue = psSHP->adBoundsMax[2];
ByteCopy( &dValue, abyHeader+76, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+76 );
dValue = psSHP->adBoundsMin[3]; /* m */
ByteCopy( &dValue, abyHeader+84, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+84 );
dValue = psSHP->adBoundsMax[3];
ByteCopy( &dValue, abyHeader+92, 8 );
if( bBigEndian ) SwapWord( 8, abyHeader+92 );
/* -------------------------------------------------------------------- */
/* Write .shp file header. */
/* -------------------------------------------------------------------- */
if( psSHP->sHooks.FSeek( psSHP->fpSHP, 0, 0 ) != 0
|| psSHP->sHooks.FWrite( abyHeader, 100, 1, psSHP->fpSHP ) != 1 )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failure writing .shp header: %s", strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
return;
}
/* -------------------------------------------------------------------- */
/* Prepare, and write .shx file header. */
/* -------------------------------------------------------------------- */
i32 = (psSHP->nRecords * 2 * sizeof(int32) + 100)/2; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
if( psSHP->sHooks.FSeek( psSHP->fpSHX, 0, 0 ) != 0
|| psSHP->sHooks.FWrite( abyHeader, 100, 1, psSHP->fpSHX ) != 1 )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failure writing .shx header: %s", strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
return;
}
/* -------------------------------------------------------------------- */
/* Write out the .shx contents. */
/* -------------------------------------------------------------------- */
panSHX = STATIC_CAST(int32 *, malloc(sizeof(int32) * 2 * psSHP->nRecords));
if( panSHX == SHPLIB_NULLPTR )
{
psSHP->sHooks.Error( "Failure allocatin panSHX" );
return;
}
for( i = 0; i < psSHP->nRecords; i++ )
{
panSHX[i*2 ] = psSHP->panRecOffset[i]/2;
panSHX[i*2+1] = psSHP->panRecSize[i]/2;
if( !bBigEndian ) SwapWord( 4, panSHX+i*2 );
if( !bBigEndian ) SwapWord( 4, panSHX+i*2+1 );
}
if( STATIC_CAST(int, psSHP->sHooks.FWrite( panSHX, sizeof(int32)*2, psSHP->nRecords, psSHP->fpSHX ))
!= psSHP->nRecords )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failure writing .shx contents: %s", strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
}
free( panSHX );
/* -------------------------------------------------------------------- */
/* Flush to disk. */
/* -------------------------------------------------------------------- */
psSHP->sHooks.FFlush( psSHP->fpSHP );
psSHP->sHooks.FFlush( psSHP->fpSHX );
}
/************************************************************************/
/* SHPOpen() */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPOpen( const char * pszLayer, const char * pszAccess )
{
SAHooks sHooks;
SASetupDefaultHooks( &sHooks );
return SHPOpenLL( pszLayer, pszAccess, &sHooks );
}
/************************************************************************/
/* SHPGetLenWithoutExtension() */
/************************************************************************/
static int SHPGetLenWithoutExtension(const char* pszBasename)
{
int i;
int nLen = STATIC_CAST(int, strlen(pszBasename));
for( i = nLen-1;
i > 0 && pszBasename[i] != '/' && pszBasename[i] != '\\';
i-- )
{
if( pszBasename[i] == '.' )
{
return i;
}
}
return nLen;
}
/************************************************************************/
/* SHPOpen() */
/* */
/* Open the .shp and .shx files based on the basename of the */
/* files or either file name. */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPOpenLL( const char * pszLayer, const char * pszAccess, SAHooks *psHooks )
{
char *pszFullname;
SHPHandle psSHP;
uchar *pabyBuf;
int i;
double dValue;
int bLazySHXLoading = FALSE;
int nLenWithoutExtension;
/* -------------------------------------------------------------------- */
/* Ensure the access string is one of the legal ones. We */
/* ensure the result string indicates binary to avoid common */
/* problems on Windows. */
/* -------------------------------------------------------------------- */
if( strcmp(pszAccess,"rb+") == 0 || strcmp(pszAccess,"r+b") == 0
|| strcmp(pszAccess,"r+") == 0 )
pszAccess = "r+b";
else
{
bLazySHXLoading = strchr(pszAccess, 'l') != SHPLIB_NULLPTR;
pszAccess = "rb";
}
/* -------------------------------------------------------------------- */
/* Establish the byte order on this machine. */
/* -------------------------------------------------------------------- */
#if !defined(bBigEndian)
i = 1;
if( *((uchar *) &i) == 1 )
bBigEndian = FALSE;
else
bBigEndian = TRUE;
#endif
/* -------------------------------------------------------------------- */
/* Initialize the info structure. */
/* -------------------------------------------------------------------- */
psSHP = STATIC_CAST(SHPHandle, calloc(sizeof(SHPInfo),1));
psSHP->bUpdated = FALSE;
memcpy( &(psSHP->sHooks), psHooks, sizeof(SAHooks) );
/* -------------------------------------------------------------------- */
/* Open the .shp and .shx files. Note that files pulled from */
/* a PC to Unix with upper case filenames won't work! */
/* -------------------------------------------------------------------- */
nLenWithoutExtension = SHPGetLenWithoutExtension(pszLayer);
pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
memcpy(pszFullname, pszLayer, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".shp", 5);
psSHP->fpSHP = psSHP->sHooks.FOpen(pszFullname, pszAccess );
if( psSHP->fpSHP == SHPLIB_NULLPTR )
{
memcpy(pszFullname + nLenWithoutExtension, ".SHP", 5);
psSHP->fpSHP = psSHP->sHooks.FOpen(pszFullname, pszAccess );
}
if( psSHP->fpSHP == SHPLIB_NULLPTR )
{
size_t nMessageLen = strlen(pszFullname)*2+256;
char *pszMessage = STATIC_CAST(char *, malloc(nMessageLen));
pszFullname[nLenWithoutExtension] = 0;
snprintf( pszMessage, nMessageLen, "Unable to open %s.shp or %s.SHP.",
pszFullname, pszFullname );
psHooks->Error( pszMessage );
free( pszMessage );
free( psSHP );
free( pszFullname );
return SHPLIB_NULLPTR;
}
memcpy(pszFullname + nLenWithoutExtension, ".shx", 5);
psSHP->fpSHX = psSHP->sHooks.FOpen(pszFullname, pszAccess );
if( psSHP->fpSHX == SHPLIB_NULLPTR )
{
memcpy(pszFullname + nLenWithoutExtension, ".SHX", 5);
psSHP->fpSHX = psSHP->sHooks.FOpen(pszFullname, pszAccess );
}
if( psSHP->fpSHX == SHPLIB_NULLPTR )
{
size_t nMessageLen = strlen(pszFullname)*2+256;
char *pszMessage = STATIC_CAST(char *, malloc(nMessageLen));
pszFullname[nLenWithoutExtension] = 0;
snprintf( pszMessage, nMessageLen, "Unable to open %s.shx or %s.SHX. "
"Set SHAPE_RESTORE_SHX config option to YES to restore or "
"create it.", pszFullname, pszFullname );
psHooks->Error( pszMessage );
free( pszMessage );
psSHP->sHooks.FClose( psSHP->fpSHP );
free( psSHP );
free( pszFullname );
return SHPLIB_NULLPTR ;
}
free( pszFullname );
/* -------------------------------------------------------------------- */
/* Read the file size from the SHP file. */
/* -------------------------------------------------------------------- */
pabyBuf = STATIC_CAST(uchar *, malloc(100));
if( psSHP->sHooks.FRead( pabyBuf, 100, 1, psSHP->fpSHP ) != 1 )
{
psSHP->sHooks.Error( ".shp file is unreadable, or corrupt." );
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
free( pabyBuf );
free( psSHP );
return SHPLIB_NULLPTR ;
}
psSHP->nFileSize = (STATIC_CAST(unsigned int, pabyBuf[24])<<24)|(pabyBuf[25]<<16)|
(pabyBuf[26]<<8)|pabyBuf[27];
if( psSHP->nFileSize < UINT_MAX / 2 )
psSHP->nFileSize *= 2;
else
psSHP->nFileSize = (UINT_MAX / 2) * 2;
/* -------------------------------------------------------------------- */
/* Read SHX file Header info */
/* -------------------------------------------------------------------- */
if( psSHP->sHooks.FRead( pabyBuf, 100, 1, psSHP->fpSHX ) != 1
|| pabyBuf[0] != 0
|| pabyBuf[1] != 0
|| pabyBuf[2] != 0x27
|| (pabyBuf[3] != 0x0a && pabyBuf[3] != 0x0d) )
{
psSHP->sHooks.Error( ".shx file is unreadable, or corrupt." );
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
free( pabyBuf );
free( psSHP );
return SHPLIB_NULLPTR;
}
psSHP->nRecords = pabyBuf[27]|(pabyBuf[26]<<8)|(pabyBuf[25]<<16)|
((pabyBuf[24] & 0x7F)<<24);
psSHP->nRecords = (psSHP->nRecords - 50) / 4;
psSHP->nShapeType = pabyBuf[32];
if( psSHP->nRecords < 0 || psSHP->nRecords > 256000000 )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Record count in .shp header is %d, which seems\n"
"unreasonable. Assuming header is corrupt.",
psSHP->nRecords );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
free( psSHP );
free(pabyBuf);
return SHPLIB_NULLPTR;
}
/* If a lot of records are advertized, check that the file is big enough */
/* to hold them */
if( psSHP->nRecords >= 1024 * 1024 )
{
SAOffset nFileSize;
psSHP->sHooks.FSeek( psSHP->fpSHX, 0, 2 );
nFileSize = psSHP->sHooks.FTell( psSHP->fpSHX );
if( nFileSize > 100 &&
nFileSize/2 < STATIC_CAST(SAOffset, psSHP->nRecords * 4 + 50) )
{
psSHP->nRecords = STATIC_CAST(int, (nFileSize - 100) / 8);
}
psSHP->sHooks.FSeek( psSHP->fpSHX, 100, 0 );
}
/* -------------------------------------------------------------------- */
/* Read the bounds. */
/* -------------------------------------------------------------------- */
if( bBigEndian ) SwapWord( 8, pabyBuf+36 );
memcpy( &dValue, pabyBuf+36, 8 );
psSHP->adBoundsMin[0] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+44 );
memcpy( &dValue, pabyBuf+44, 8 );
psSHP->adBoundsMin[1] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+52 );
memcpy( &dValue, pabyBuf+52, 8 );
psSHP->adBoundsMax[0] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+60 );
memcpy( &dValue, pabyBuf+60, 8 );
psSHP->adBoundsMax[1] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+68 ); /* z */
memcpy( &dValue, pabyBuf+68, 8 );
psSHP->adBoundsMin[2] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+76 );
memcpy( &dValue, pabyBuf+76, 8 );
psSHP->adBoundsMax[2] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+84 ); /* z */
memcpy( &dValue, pabyBuf+84, 8 );
psSHP->adBoundsMin[3] = dValue;
if( bBigEndian ) SwapWord( 8, pabyBuf+92 );
memcpy( &dValue, pabyBuf+92, 8 );
psSHP->adBoundsMax[3] = dValue;
free( pabyBuf );
/* -------------------------------------------------------------------- */
/* Read the .shx file to get the offsets to each record in */
/* the .shp file. */
/* -------------------------------------------------------------------- */
psSHP->nMaxRecords = psSHP->nRecords;
psSHP->panRecOffset = STATIC_CAST(unsigned int *,
malloc(sizeof(unsigned int) * MAX(1,psSHP->nMaxRecords) ));
psSHP->panRecSize = STATIC_CAST(unsigned int *,
malloc(sizeof(unsigned int) * MAX(1,psSHP->nMaxRecords) ));
if( bLazySHXLoading )
pabyBuf = SHPLIB_NULLPTR;
else
pabyBuf = STATIC_CAST(uchar *, malloc(8 * MAX(1,psSHP->nRecords) ));
if (psSHP->panRecOffset == SHPLIB_NULLPTR ||
psSHP->panRecSize == SHPLIB_NULLPTR ||
(!bLazySHXLoading && pabyBuf == SHPLIB_NULLPTR))
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Not enough memory to allocate requested memory (nRecords=%d).\n"
"Probably broken SHP file",
psSHP->nRecords );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
if (psSHP->panRecOffset) free( psSHP->panRecOffset );
if (psSHP->panRecSize) free( psSHP->panRecSize );
if (pabyBuf) free( pabyBuf );
free( psSHP );
return SHPLIB_NULLPTR;
}
if( bLazySHXLoading )
{
memset(psSHP->panRecOffset, 0, sizeof(unsigned int) * MAX(1,psSHP->nMaxRecords) );
memset(psSHP->panRecSize, 0, sizeof(unsigned int) * MAX(1,psSHP->nMaxRecords) );
free( pabyBuf ); // sometimes make cppcheck happy, but
return( psSHP );
}
if( STATIC_CAST(int, psSHP->sHooks.FRead( pabyBuf, 8, psSHP->nRecords, psSHP->fpSHX ))
!= psSHP->nRecords )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failed to read all values for %d records in .shx file: %s.",
psSHP->nRecords, strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
/* SHX is short or unreadable for some reason. */
psSHP->sHooks.FClose( psSHP->fpSHP );
psSHP->sHooks.FClose( psSHP->fpSHX );
free( psSHP->panRecOffset );
free( psSHP->panRecSize );
free( pabyBuf );
free( psSHP );
return SHPLIB_NULLPTR;
}
/* In read-only mode, we can close the SHX now */
if (strcmp(pszAccess, "rb") == 0)
{
psSHP->sHooks.FClose( psSHP->fpSHX );
psSHP->fpSHX = SHPLIB_NULLPTR;
}
for( i = 0; i < psSHP->nRecords; i++ )
{
unsigned int nOffset, nLength;
memcpy( &nOffset, pabyBuf + i * 8, 4 );
if( !bBigEndian ) SwapWord( 4, &nOffset );
memcpy( &nLength, pabyBuf + i * 8 + 4, 4 );
if( !bBigEndian ) SwapWord( 4, &nLength );
if( nOffset > STATIC_CAST(unsigned int, INT_MAX) )
{
char str[128];
snprintf( str, sizeof(str),
"Invalid offset for entity %d", i);
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
SHPClose(psSHP);
free( pabyBuf );
return SHPLIB_NULLPTR;
}
if( nLength > STATIC_CAST(unsigned int, INT_MAX / 2 - 4) )
{
char str[128];
snprintf( str, sizeof(str),
"Invalid length for entity %d", i);
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
SHPClose(psSHP);
free( pabyBuf );
return SHPLIB_NULLPTR;
}
psSHP->panRecOffset[i] = nOffset*2;
psSHP->panRecSize[i] = nLength*2;
}
free( pabyBuf );
return( psSHP );
}
/************************************************************************/
/* SHPOpenLLEx() */
/* */
/* Open the .shp and .shx files based on the basename of the */
/* files or either file name. It generally invokes SHPRestoreSHX() */
/* in case when bRestoreSHX equals true. */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPOpenLLEx( const char * pszLayer, const char * pszAccess, SAHooks *psHooks,
int bRestoreSHX )
{
if ( !bRestoreSHX ) return SHPOpenLL ( pszLayer, pszAccess, psHooks );
else
{
if ( SHPRestoreSHX ( pszLayer, pszAccess, psHooks ) )
{
return SHPOpenLL ( pszLayer, pszAccess, psHooks );
}
}
return SHPLIB_NULLPTR;
}
/************************************************************************/
/* SHPRestoreSHX() */
/* */
/* Restore .SHX file using associated .SHP file. */
/* */
/************************************************************************/
int SHPAPI_CALL
SHPRestoreSHX ( const char * pszLayer, const char * pszAccess, SAHooks *psHooks )
{
char *pszFullname;
SAFile fpSHP, fpSHX;
uchar *pabyBuf;
int nLenWithoutExtension;
unsigned int nSHPFilesize;
unsigned int nCurrentSHPOffset = 100;
size_t nRealSHXContentSize = 100;
const char pszSHXAccess[] = "w+b";
char *pabySHXHeader;
char abyReadedRecord[8];
unsigned int niRecord = 0;
unsigned int nRecordLength = 0;
unsigned int nRecordOffset = 50;
/* -------------------------------------------------------------------- */
/* Ensure the access string is one of the legal ones. We */
/* ensure the result string indicates binary to avoid common */
/* problems on Windows. */
/* -------------------------------------------------------------------- */
if( strcmp(pszAccess,"rb+") == 0 || strcmp(pszAccess,"r+b") == 0
|| strcmp(pszAccess,"r+") == 0 )
pszAccess = "r+b";
else
{
pszAccess = "rb";
}
/* -------------------------------------------------------------------- */
/* Establish the byte order on this machine. */
/* -------------------------------------------------------------------- */
#if !defined(bBigEndian)
{
int i = 1;
if( *((uchar *) &i) == 1 )
bBigEndian = FALSE;
else
bBigEndian = TRUE;
}
#endif
/* -------------------------------------------------------------------- */
/* Open the .shp file. Note that files pulled from */
/* a PC to Unix with upper case filenames won't work! */
/* -------------------------------------------------------------------- */
nLenWithoutExtension = SHPGetLenWithoutExtension(pszLayer);
pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
memcpy(pszFullname, pszLayer, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".shp", 5);
fpSHP = psHooks->FOpen(pszFullname, pszAccess );
if( fpSHP == SHPLIB_NULLPTR )
{
memcpy(pszFullname + nLenWithoutExtension, ".SHP", 5);
fpSHP = psHooks->FOpen(pszFullname, pszAccess );
}
if( fpSHP == SHPLIB_NULLPTR )
{
size_t nMessageLen = strlen( pszFullname ) * 2 + 256;
char* pszMessage = STATIC_CAST(char *, malloc( nMessageLen ));
pszFullname[nLenWithoutExtension] = 0;
snprintf( pszMessage, nMessageLen, "Unable to open %s.shp or %s.SHP.",
pszFullname, pszFullname );
psHooks->Error( pszMessage );
free( pszMessage );
free( pszFullname );
return( 0 );
}
/* -------------------------------------------------------------------- */
/* Read the file size from the SHP file. */
/* -------------------------------------------------------------------- */
pabyBuf = STATIC_CAST(uchar *, malloc(100));
if( psHooks->FRead( pabyBuf, 100, 1, fpSHP ) != 1 )
{
psHooks->Error( ".shp file is unreadable, or corrupt." );
psHooks->FClose( fpSHP );
free( pabyBuf );
free( pszFullname );
return( 0 );
}
nSHPFilesize = (STATIC_CAST(unsigned int, pabyBuf[24])<<24)|(pabyBuf[25]<<16)|
(pabyBuf[26]<<8)|pabyBuf[27];
if( nSHPFilesize < UINT_MAX / 2 )
nSHPFilesize *= 2;
else
nSHPFilesize = (UINT_MAX / 2) * 2;
memcpy(pszFullname + nLenWithoutExtension, ".shx", 5);
fpSHX = psHooks->FOpen( pszFullname, pszSHXAccess );
if( fpSHX == SHPLIB_NULLPTR )
{
size_t nMessageLen = strlen( pszFullname ) * 2 + 256;
char* pszMessage = STATIC_CAST(char *, malloc( nMessageLen ));
pszFullname[nLenWithoutExtension] = 0;
snprintf( pszMessage, nMessageLen,
"Error opening file %s.shx for writing", pszFullname );
psHooks->Error( pszMessage );
free( pszMessage );
psHooks->FClose( fpSHP );
free( pabyBuf );
free( pszFullname );
return( 0 );
}
/* -------------------------------------------------------------------- */
/* Open SHX and create it using SHP file content. */
/* -------------------------------------------------------------------- */
psHooks->FSeek( fpSHP, 100, 0 );
pabySHXHeader = STATIC_CAST(char *, malloc ( 100 ));
memcpy( pabySHXHeader, pabyBuf, 100 );
psHooks->FWrite( pabySHXHeader, 100, 1, fpSHX );
free ( pabyBuf );
while( nCurrentSHPOffset < nSHPFilesize )
{
if( psHooks->FRead( &niRecord, 4, 1, fpSHP ) == 1 &&
psHooks->FRead( &nRecordLength, 4, 1, fpSHP ) == 1)
{
if( !bBigEndian ) SwapWord( 4, &nRecordOffset );
memcpy( abyReadedRecord, &nRecordOffset, 4 );
memcpy( abyReadedRecord + 4, &nRecordLength, 4 );
psHooks->FWrite( abyReadedRecord, 8, 1, fpSHX );
if ( !bBigEndian ) SwapWord( 4, &nRecordOffset );
if ( !bBigEndian ) SwapWord( 4, &nRecordLength );
nRecordOffset += nRecordLength + 4;
nCurrentSHPOffset += 8 + nRecordLength * 2;
psHooks->FSeek( fpSHP, nCurrentSHPOffset, 0 );
nRealSHXContentSize += 8;
}
else
{
psHooks->Error( "Error parsing .shp to restore .shx" );
psHooks->FClose( fpSHX );
psHooks->FClose( fpSHP );
free( pabySHXHeader );
free( pszFullname );
return( 0 );
}
}
nRealSHXContentSize /= 2; // Bytes counted -> WORDs
if( !bBigEndian ) SwapWord( 4, &nRealSHXContentSize );
psHooks->FSeek( fpSHX, 24, 0 );
psHooks->FWrite( &nRealSHXContentSize, 4, 1, fpSHX );
psHooks->FClose( fpSHP );
psHooks->FClose( fpSHX );
free ( pszFullname );
free ( pabySHXHeader );
return( 1 );
}
/************************************************************************/
/* SHPClose() */
/* */
/* Close the .shp and .shx files. */
/************************************************************************/
void SHPAPI_CALL
SHPClose(SHPHandle psSHP )
{
if( psSHP == SHPLIB_NULLPTR )
return;
/* -------------------------------------------------------------------- */
/* Update the header if we have modified anything. */
/* -------------------------------------------------------------------- */
if( psSHP->bUpdated )
SHPWriteHeader( psSHP );
/* -------------------------------------------------------------------- */
/* Free all resources, and close files. */
/* -------------------------------------------------------------------- */
free( psSHP->panRecOffset );
free( psSHP->panRecSize );
if ( psSHP->fpSHX != SHPLIB_NULLPTR)
psSHP->sHooks.FClose( psSHP->fpSHX );
psSHP->sHooks.FClose( psSHP->fpSHP );
if( psSHP->pabyRec != SHPLIB_NULLPTR )
{
free( psSHP->pabyRec );
}
if( psSHP->pabyObjectBuf != SHPLIB_NULLPTR )
{
free( psSHP->pabyObjectBuf );
}
if( psSHP->psCachedObject != SHPLIB_NULLPTR )
{
free( psSHP->psCachedObject );
}
free( psSHP );
}
/************************************************************************/
/* SHPSetFastModeReadObject() */
/************************************************************************/
/* If setting bFastMode = TRUE, the content of SHPReadObject() is owned by the SHPHandle. */
/* So you cannot have 2 valid instances of SHPReadObject() simultaneously. */
/* The SHPObject padfZ and padfM members may be NULL depending on the geometry */
/* type. It is illegal to free at hand any of the pointer members of the SHPObject structure */
void SHPAPI_CALL SHPSetFastModeReadObject( SHPHandle hSHP, int bFastMode )
{
if( bFastMode )
{
if( hSHP->psCachedObject == SHPLIB_NULLPTR )
{
hSHP->psCachedObject = STATIC_CAST(SHPObject*, calloc(1, sizeof(SHPObject)));
assert( hSHP->psCachedObject != SHPLIB_NULLPTR );
}
}
hSHP->bFastModeReadObject = bFastMode;
}
/************************************************************************/
/* SHPGetInfo() */
/* */
/* Fetch general information about the shape file. */
/************************************************************************/
void SHPAPI_CALL
SHPGetInfo(SHPHandle psSHP, int * pnEntities, int * pnShapeType,
double * padfMinBound, double * padfMaxBound )
{
int i;
if( psSHP == SHPLIB_NULLPTR )
return;
if( pnEntities != SHPLIB_NULLPTR )
*pnEntities = psSHP->nRecords;
if( pnShapeType != SHPLIB_NULLPTR )
*pnShapeType = psSHP->nShapeType;
for( i = 0; i < 4; i++ )
{
if( padfMinBound != SHPLIB_NULLPTR )
padfMinBound[i] = psSHP->adBoundsMin[i];
if( padfMaxBound != SHPLIB_NULLPTR )
padfMaxBound[i] = psSHP->adBoundsMax[i];
}
}
/************************************************************************/
/* SHPCreate() */
/* */
/* Create a new shape file and return a handle to the open */
/* shape file with read/write access. */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPCreate( const char * pszLayer, int nShapeType )
{
SAHooks sHooks;
SASetupDefaultHooks( &sHooks );
return SHPCreateLL( pszLayer, nShapeType, &sHooks );
}
/************************************************************************/
/* SHPCreate() */
/* */
/* Create a new shape file and return a handle to the open */
/* shape file with read/write access. */
/************************************************************************/
SHPHandle SHPAPI_CALL
SHPCreateLL( const char * pszLayer, int nShapeType, SAHooks *psHooks )
{
char *pszFullname;
SAFile fpSHP;
SAFile fpSHX = SHPLIB_NULLPTR;
uchar abyHeader[100];
int32 i32;
double dValue;
int nLenWithoutExtension;
/* -------------------------------------------------------------------- */
/* Establish the byte order on this system. */
/* -------------------------------------------------------------------- */
#if !defined(bBigEndian)
{
int i = 1;
if( *((uchar *) &i) == 1 )
bBigEndian = FALSE;
else
bBigEndian = TRUE;
}
#endif
/* -------------------------------------------------------------------- */
/* Open the two files so we can write their headers. */
/* -------------------------------------------------------------------- */
nLenWithoutExtension = SHPGetLenWithoutExtension(pszLayer);
pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
memcpy(pszFullname, pszLayer, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".shp", 5);
fpSHP = psHooks->FOpen(pszFullname, "wb" );
if( fpSHP == SHPLIB_NULLPTR )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failed to create file %s: %s",
pszFullname, strerror(errno) );
psHooks->Error( szErrorMsg );
goto error;
}
memcpy(pszFullname + nLenWithoutExtension, ".shx", 5);
fpSHX = psHooks->FOpen(pszFullname, "wb" );
if( fpSHX == SHPLIB_NULLPTR )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failed to create file %s: %s",
pszFullname, strerror(errno) );
psHooks->Error( szErrorMsg );
goto error;
}
free( pszFullname ); pszFullname = SHPLIB_NULLPTR;
/* -------------------------------------------------------------------- */
/* Prepare header block for .shp file. */
/* -------------------------------------------------------------------- */
memset( abyHeader, 0, sizeof(abyHeader) );
abyHeader[2] = 0x27; /* magic cookie */
abyHeader[3] = 0x0a;
i32 = 50; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
i32 = 1000; /* version */
ByteCopy( &i32, abyHeader+28, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+28 );
i32 = nShapeType; /* shape type */
ByteCopy( &i32, abyHeader+32, 4 );
if( bBigEndian ) SwapWord( 4, abyHeader+32 );
dValue = 0.0; /* set bounds */
ByteCopy( &dValue, abyHeader+36, 8 );
ByteCopy( &dValue, abyHeader+44, 8 );
ByteCopy( &dValue, abyHeader+52, 8 );
ByteCopy( &dValue, abyHeader+60, 8 );
/* -------------------------------------------------------------------- */
/* Write .shp file header. */
/* -------------------------------------------------------------------- */
if( psHooks->FWrite( abyHeader, 100, 1, fpSHP ) != 1 )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failed to write .shp header: %s", strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psHooks->Error( szErrorMsg );
goto error;
}
/* -------------------------------------------------------------------- */
/* Prepare, and write .shx file header. */
/* -------------------------------------------------------------------- */
i32 = 50; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );
if( psHooks->FWrite( abyHeader, 100, 1, fpSHX ) != 1 )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Failure writing .shx header: %s", strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psHooks->Error( szErrorMsg );
goto error;
}
/* -------------------------------------------------------------------- */
/* Close the files, and then open them as regular existing files. */
/* -------------------------------------------------------------------- */
psHooks->FClose( fpSHP );
psHooks->FClose( fpSHX );
return( SHPOpenLL( pszLayer, "r+b", psHooks ) );
error:
if (pszFullname) free(pszFullname);
if (fpSHP) psHooks->FClose( fpSHP );
if (fpSHX) psHooks->FClose( fpSHX );
return SHPLIB_NULLPTR;
}
/************************************************************************/
/* _SHPSetBounds() */
/* */
/* Compute a bounds rectangle for a shape, and set it into the */
/* indicated location in the record. */
/************************************************************************/
static void _SHPSetBounds( uchar * pabyRec, SHPObject * psShape )
{
ByteCopy( &(psShape->dfXMin), pabyRec + 0, 8 );
ByteCopy( &(psShape->dfYMin), pabyRec + 8, 8 );
ByteCopy( &(psShape->dfXMax), pabyRec + 16, 8 );
ByteCopy( &(psShape->dfYMax), pabyRec + 24, 8 );
if( bBigEndian )
{
SwapWord( 8, pabyRec + 0 );
SwapWord( 8, pabyRec + 8 );
SwapWord( 8, pabyRec + 16 );
SwapWord( 8, pabyRec + 24 );
}
}
/************************************************************************/
/* SHPComputeExtents() */
/* */
/* Recompute the extents of a shape. Automatically done by */
/* SHPCreateObject(). */
/************************************************************************/
void SHPAPI_CALL
SHPComputeExtents( SHPObject * psObject )
{
int i;
/* -------------------------------------------------------------------- */
/* Build extents for this object. */
/* -------------------------------------------------------------------- */
if( psObject->nVertices > 0 )
{
psObject->dfXMin = psObject->dfXMax = psObject->padfX[0];
psObject->dfYMin = psObject->dfYMax = psObject->padfY[0];
psObject->dfZMin = psObject->dfZMax = psObject->padfZ[0];
psObject->dfMMin = psObject->dfMMax = psObject->padfM[0];
}
for( i = 0; i < psObject->nVertices; i++ )
{
psObject->dfXMin = MIN(psObject->dfXMin, psObject->padfX[i]);
psObject->dfYMin = MIN(psObject->dfYMin, psObject->padfY[i]);
psObject->dfZMin = MIN(psObject->dfZMin, psObject->padfZ[i]);
psObject->dfMMin = MIN(psObject->dfMMin, psObject->padfM[i]);
psObject->dfXMax = MAX(psObject->dfXMax, psObject->padfX[i]);
psObject->dfYMax = MAX(psObject->dfYMax, psObject->padfY[i]);
psObject->dfZMax = MAX(psObject->dfZMax, psObject->padfZ[i]);
psObject->dfMMax = MAX(psObject->dfMMax, psObject->padfM[i]);
}
}
/************************************************************************/
/* SHPCreateObject() */
/* */
/* Create a shape object. It should be freed with */
/* SHPDestroyObject(). */
/************************************************************************/
SHPObject SHPAPI_CALL1(*)
SHPCreateObject( int nSHPType, int nShapeId, int nParts,
const int * panPartStart, const int * panPartType,
int nVertices, const double *padfX, const double *padfY,
const double * padfZ, const double * padfM )
{
SHPObject *psObject;
int i, bHasM, bHasZ;
psObject = STATIC_CAST(SHPObject *, calloc(1,sizeof(SHPObject)));
psObject->nSHPType = nSHPType;
psObject->nShapeId = nShapeId;
psObject->bMeasureIsUsed = FALSE;
/* -------------------------------------------------------------------- */
/* Establish whether this shape type has M, and Z values. */
/* -------------------------------------------------------------------- */
if( nSHPType == SHPT_ARCM
|| nSHPType == SHPT_POINTM
|| nSHPType == SHPT_POLYGONM
|| nSHPType == SHPT_MULTIPOINTM )
{
bHasM = TRUE;
bHasZ = FALSE;
}
else if( nSHPType == SHPT_ARCZ
|| nSHPType == SHPT_POINTZ
|| nSHPType == SHPT_POLYGONZ
|| nSHPType == SHPT_MULTIPOINTZ
|| nSHPType == SHPT_MULTIPATCH )
{
bHasM = TRUE;
bHasZ = TRUE;
}
else
{
bHasM = FALSE;
bHasZ = FALSE;
}
/* -------------------------------------------------------------------- */
/* Capture parts. Note that part type is optional, and */
/* defaults to ring. */
/* -------------------------------------------------------------------- */
if( nSHPType == SHPT_ARC || nSHPType == SHPT_POLYGON
|| nSHPType == SHPT_ARCM || nSHPType == SHPT_POLYGONM
|| nSHPType == SHPT_ARCZ || nSHPType == SHPT_POLYGONZ
|| nSHPType == SHPT_MULTIPATCH )
{
psObject->nParts = MAX(1,nParts);
psObject->panPartStart = STATIC_CAST(int *,
calloc(sizeof(int), psObject->nParts));
psObject->panPartType = STATIC_CAST(int *,
malloc(sizeof(int) * psObject->nParts));
psObject->panPartStart[0] = 0;
psObject->panPartType[0] = SHPP_RING;
for( i = 0; i < nParts; i++ )
{
if( panPartStart != SHPLIB_NULLPTR )
psObject->panPartStart[i] = panPartStart[i];
if( panPartType != SHPLIB_NULLPTR )
psObject->panPartType[i] = panPartType[i];
else
psObject->panPartType[i] = SHPP_RING;
}
if( psObject->panPartStart[0] != 0 )
psObject->panPartStart[0] = 0;
}
/* -------------------------------------------------------------------- */
/* Capture vertices. Note that X, Y, Z and M are optional. */
/* -------------------------------------------------------------------- */
if( nVertices > 0 )
{
size_t nSize = sizeof(double) * nVertices;
psObject->padfX = STATIC_CAST(double *, padfX ? malloc(nSize) :
calloc(sizeof(double),nVertices));
psObject->padfY = STATIC_CAST(double *, padfY ? malloc(nSize) :
calloc(sizeof(double),nVertices));
psObject->padfZ = STATIC_CAST(double *, padfZ && bHasZ ? malloc(nSize) :
calloc(sizeof(double),nVertices));
psObject->padfM = STATIC_CAST(double *, padfM && bHasM ? malloc(nSize) :
calloc(sizeof(double),nVertices));
if( padfX != SHPLIB_NULLPTR )
memcpy(psObject->padfX, padfX, nSize);
if( padfY != SHPLIB_NULLPTR )
memcpy(psObject->padfY, padfY, nSize);
if( padfZ != SHPLIB_NULLPTR && bHasZ )
memcpy(psObject->padfZ, padfZ, nSize);
if( padfM != SHPLIB_NULLPTR && bHasM )
{
memcpy(psObject->padfM, padfM, nSize);
psObject->bMeasureIsUsed = TRUE;
}
}
/* -------------------------------------------------------------------- */
/* Compute the extents. */
/* -------------------------------------------------------------------- */
psObject->nVertices = nVertices;
SHPComputeExtents( psObject );
return( psObject );
}
/************************************************************************/
/* SHPCreateSimpleObject() */
/* */
/* Create a simple (common) shape object. Destroy with */
/* SHPDestroyObject(). */
/************************************************************************/
SHPObject SHPAPI_CALL1(*)
SHPCreateSimpleObject( int nSHPType, int nVertices,
const double * padfX, const double * padfY,
const double * padfZ )
{
return( SHPCreateObject( nSHPType, -1, 0, SHPLIB_NULLPTR, SHPLIB_NULLPTR,
nVertices, padfX, padfY, padfZ, SHPLIB_NULLPTR ) );
}
/************************************************************************/
/* SHPWriteObject() */
/* */
/* Write out the vertices of a new structure. Note that it is */
/* only possible to write vertices at the end of the file. */
/************************************************************************/
int SHPAPI_CALL
SHPWriteObject(SHPHandle psSHP, int nShapeId, SHPObject * psObject )
{
SAOffset nRecordOffset;
unsigned int nRecordSize=0;
int i;
uchar *pabyRec;
int32 i32;
int bAppendToLastRecord = FALSE;
int bAppendToFile = FALSE;
psSHP->bUpdated = TRUE;
/* -------------------------------------------------------------------- */
/* Ensure that shape object matches the type of the file it is */
/* being written to. */
/* -------------------------------------------------------------------- */
assert( psObject->nSHPType == psSHP->nShapeType
|| psObject->nSHPType == SHPT_NULL );
/* -------------------------------------------------------------------- */
/* Ensure that -1 is used for appends. Either blow an */
/* assertion, or if they are disabled, set the shapeid to -1 */
/* for appends. */
/* -------------------------------------------------------------------- */
assert( nShapeId == -1
|| (nShapeId >= 0 && nShapeId < psSHP->nRecords) );
if( nShapeId != -1 && nShapeId >= psSHP->nRecords )
nShapeId = -1;
/* -------------------------------------------------------------------- */
/* Add the new entity to the in memory index. */
/* -------------------------------------------------------------------- */
if( nShapeId == -1 && psSHP->nRecords+1 > psSHP->nMaxRecords )
{
int nNewMaxRecords = psSHP->nMaxRecords + psSHP->nMaxRecords / 3 + 100;
unsigned int* panRecOffsetNew;
unsigned int* panRecSizeNew;
panRecOffsetNew = STATIC_CAST(unsigned int *,
SfRealloc(psSHP->panRecOffset,sizeof(unsigned int) * nNewMaxRecords ));
if( panRecOffsetNew == SHPLIB_NULLPTR )
return -1;
psSHP->panRecOffset = panRecOffsetNew;
panRecSizeNew = STATIC_CAST(unsigned int *,
SfRealloc(psSHP->panRecSize,sizeof(unsigned int) * nNewMaxRecords ));
if( panRecSizeNew == SHPLIB_NULLPTR )
return -1;
psSHP->panRecSize = panRecSizeNew;
psSHP->nMaxRecords = nNewMaxRecords;
}
/* -------------------------------------------------------------------- */
/* Initialize record. */
/* -------------------------------------------------------------------- */
pabyRec = STATIC_CAST(uchar *, malloc(psObject->nVertices * 4 * sizeof(double)
+ psObject->nParts * 8 + 128));
if( pabyRec == SHPLIB_NULLPTR )
return -1;
/* -------------------------------------------------------------------- */
/* Extract vertices for a Polygon or Arc. */
/* -------------------------------------------------------------------- */
if( psObject->nSHPType == SHPT_POLYGON
|| psObject->nSHPType == SHPT_POLYGONZ
|| psObject->nSHPType == SHPT_POLYGONM
|| psObject->nSHPType == SHPT_ARC
|| psObject->nSHPType == SHPT_ARCZ
|| psObject->nSHPType == SHPT_ARCM
|| psObject->nSHPType == SHPT_MULTIPATCH )
{
int32 nPoints, nParts;
nPoints = psObject->nVertices;
nParts = psObject->nParts;
_SHPSetBounds( pabyRec + 12, psObject );
if( bBigEndian ) SwapWord( 4, &nPoints );
if( bBigEndian ) SwapWord( 4, &nParts );
ByteCopy( &nPoints, pabyRec + 40 + 8, 4 );
ByteCopy( &nParts, pabyRec + 36 + 8, 4 );
nRecordSize = 52;
/*
* Write part start positions.
*/
ByteCopy( psObject->panPartStart, pabyRec + 44 + 8,
4 * psObject->nParts );
for( i = 0; i < psObject->nParts; i++ )
{
if( bBigEndian ) SwapWord( 4, pabyRec + 44 + 8 + 4*i );
nRecordSize += 4;
}
/*
* Write multipatch part types if needed.
*/
if( psObject->nSHPType == SHPT_MULTIPATCH )
{
memcpy( pabyRec + nRecordSize, psObject->panPartType,
4*psObject->nParts );
for( i = 0; i < psObject->nParts; i++ )
{
if( bBigEndian ) SwapWord( 4, pabyRec + nRecordSize );
nRecordSize += 4;
}
}
/*
* Write the (x,y) vertex values.
*/
for( i = 0; i < psObject->nVertices; i++ )
{
ByteCopy( psObject->padfX + i, pabyRec + nRecordSize, 8 );
ByteCopy( psObject->padfY + i, pabyRec + nRecordSize + 8, 8 );
if( bBigEndian )
SwapWord( 8, pabyRec + nRecordSize );
if( bBigEndian )
SwapWord( 8, pabyRec + nRecordSize + 8 );
nRecordSize += 2 * 8;
}
/*
* Write the Z coordinates (if any).
*/
if( psObject->nSHPType == SHPT_POLYGONZ
|| psObject->nSHPType == SHPT_ARCZ
|| psObject->nSHPType == SHPT_MULTIPATCH )
{
ByteCopy( &(psObject->dfZMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(psObject->dfZMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < psObject->nVertices; i++ )
{
ByteCopy( psObject->padfZ + i, pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
/*
* Write the M values, if any.
*/
if( psObject->bMeasureIsUsed
&& (psObject->nSHPType == SHPT_POLYGONM
|| psObject->nSHPType == SHPT_ARCM
#ifndef DISABLE_MULTIPATCH_MEASURE
|| psObject->nSHPType == SHPT_MULTIPATCH
#endif
|| psObject->nSHPType == SHPT_POLYGONZ
|| psObject->nSHPType == SHPT_ARCZ) )
{
ByteCopy( &(psObject->dfMMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(psObject->dfMMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < psObject->nVertices; i++ )
{
ByteCopy( psObject->padfM + i, pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
}
/* -------------------------------------------------------------------- */
/* Extract vertices for a MultiPoint. */
/* -------------------------------------------------------------------- */
else if( psObject->nSHPType == SHPT_MULTIPOINT
|| psObject->nSHPType == SHPT_MULTIPOINTZ
|| psObject->nSHPType == SHPT_MULTIPOINTM )
{
int32 nPoints;
nPoints = psObject->nVertices;
_SHPSetBounds( pabyRec + 12, psObject );
if( bBigEndian ) SwapWord( 4, &nPoints );
ByteCopy( &nPoints, pabyRec + 44, 4 );
for( i = 0; i < psObject->nVertices; i++ )
{
ByteCopy( psObject->padfX + i, pabyRec + 48 + i*16, 8 );
ByteCopy( psObject->padfY + i, pabyRec + 48 + i*16 + 8, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + 48 + i*16 );
if( bBigEndian ) SwapWord( 8, pabyRec + 48 + i*16 + 8 );
}
nRecordSize = 48 + 16 * psObject->nVertices;
if( psObject->nSHPType == SHPT_MULTIPOINTZ )
{
ByteCopy( &(psObject->dfZMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(psObject->dfZMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < psObject->nVertices; i++ )
{
ByteCopy( psObject->padfZ + i, pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
if( psObject->bMeasureIsUsed
&& (psObject->nSHPType == SHPT_MULTIPOINTZ
|| psObject->nSHPType == SHPT_MULTIPOINTM) )
{
ByteCopy( &(psObject->dfMMin), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
ByteCopy( &(psObject->dfMMax), pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
for( i = 0; i < psObject->nVertices; i++ )
{
ByteCopy( psObject->padfM + i, pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
}
/* -------------------------------------------------------------------- */
/* Write point. */
/* -------------------------------------------------------------------- */
else if( psObject->nSHPType == SHPT_POINT
|| psObject->nSHPType == SHPT_POINTZ
|| psObject->nSHPType == SHPT_POINTM )
{
ByteCopy( psObject->padfX, pabyRec + 12, 8 );
ByteCopy( psObject->padfY, pabyRec + 20, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + 12 );
if( bBigEndian ) SwapWord( 8, pabyRec + 20 );
nRecordSize = 28;
if( psObject->nSHPType == SHPT_POINTZ )
{
ByteCopy( psObject->padfZ, pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
if( psObject->bMeasureIsUsed
&& (psObject->nSHPType == SHPT_POINTZ
|| psObject->nSHPType == SHPT_POINTM) )
{
ByteCopy( psObject->padfM, pabyRec + nRecordSize, 8 );
if( bBigEndian ) SwapWord( 8, pabyRec + nRecordSize );
nRecordSize += 8;
}
}
/* -------------------------------------------------------------------- */
/* Not much to do for null geometries. */
/* -------------------------------------------------------------------- */
else if( psObject->nSHPType == SHPT_NULL )
{
nRecordSize = 12;
}
else
{
/* unknown type */
assert( FALSE );
}
/* -------------------------------------------------------------------- */
/* Establish where we are going to put this record. If we are */
/* rewriting the last record of the file, then we can update it in */
/* place. Otherwise if rewriting an existing record, and it will */
/* fit, then put it back where the original came from. Otherwise */
/* write at the end. */
/* -------------------------------------------------------------------- */
if( nShapeId != -1 && psSHP->panRecOffset[nShapeId] +
psSHP->panRecSize[nShapeId] + 8 == psSHP->nFileSize )
{
nRecordOffset = psSHP->panRecOffset[nShapeId];
bAppendToLastRecord = TRUE;
}
else if( nShapeId == -1 || psSHP->panRecSize[nShapeId] < nRecordSize-8 )
{
if( psSHP->nFileSize > UINT_MAX - nRecordSize)
{
char str[128];
snprintf( str, sizeof(str), "Failed to write shape object. "
"File size cannot reach %u + %u.",
psSHP->nFileSize, nRecordSize );
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
free( pabyRec );
return -1;
}
bAppendToFile = TRUE;
nRecordOffset = psSHP->nFileSize;
}
else
{
nRecordOffset = psSHP->panRecOffset[nShapeId];
}
/* -------------------------------------------------------------------- */
/* Set the shape type, record number, and record size. */
/* -------------------------------------------------------------------- */
i32 = (nShapeId < 0) ? psSHP->nRecords+1 : nShapeId+1; /* record # */
if( !bBigEndian ) SwapWord( 4, &i32 );
ByteCopy( &i32, pabyRec, 4 );
i32 = (nRecordSize-8)/2; /* record size */
if( !bBigEndian ) SwapWord( 4, &i32 );
ByteCopy( &i32, pabyRec + 4, 4 );
i32 = psObject->nSHPType; /* shape type */
if( bBigEndian ) SwapWord( 4, &i32 );
ByteCopy( &i32, pabyRec + 8, 4 );
/* -------------------------------------------------------------------- */
/* Write out record. */
/* -------------------------------------------------------------------- */
/* -------------------------------------------------------------------- */
/* Guard FSeek with check for whether we're already at position; */
/* no-op FSeeks defeat network filesystems' write buffering. */
/* -------------------------------------------------------------------- */
/* TOOK OUT GUARD cause causing mingw64 to fail, see https://trac.osgeo.org/postgis/ticket/4603 */
//if ( psSHP->sHooks.FTell( psSHP->fpSHP ) != nRecordOffset ) {
if( psSHP->sHooks.FSeek( psSHP->fpSHP, nRecordOffset, 0 ) != 0 )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Error in psSHP->sHooks.FSeek() while writing object to .shp file: %s",
strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
free( pabyRec );
return -1;
}
//}
if( psSHP->sHooks.FWrite( pabyRec, nRecordSize, 1, psSHP->fpSHP ) < 1 )
{
char szErrorMsg[200];
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Error in psSHP->sHooks.FWrite() while writing object of %u bytes to .shp file: %s",
nRecordSize, strerror(errno) );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
free( pabyRec );
return -1;
}
free( pabyRec );
if( bAppendToLastRecord )
{
psSHP->nFileSize = psSHP->panRecOffset[nShapeId] + nRecordSize;
}
else if( bAppendToFile )
{
if( nShapeId == -1 )
nShapeId = psSHP->nRecords++;
psSHP->panRecOffset[nShapeId] = psSHP->nFileSize;
psSHP->nFileSize += nRecordSize;
}
psSHP->panRecSize[nShapeId] = nRecordSize-8;
/* -------------------------------------------------------------------- */
/* Expand file wide bounds based on this shape. */
/* -------------------------------------------------------------------- */
if( psSHP->adBoundsMin[0] == 0.0
&& psSHP->adBoundsMax[0] == 0.0
&& psSHP->adBoundsMin[1] == 0.0
&& psSHP->adBoundsMax[1] == 0.0 )
{
if( psObject->nSHPType == SHPT_NULL || psObject->nVertices == 0 )
{
psSHP->adBoundsMin[0] = psSHP->adBoundsMax[0] = 0.0;
psSHP->adBoundsMin[1] = psSHP->adBoundsMax[1] = 0.0;
psSHP->adBoundsMin[2] = psSHP->adBoundsMax[2] = 0.0;
psSHP->adBoundsMin[3] = psSHP->adBoundsMax[3] = 0.0;
}
else
{
psSHP->adBoundsMin[0] = psSHP->adBoundsMax[0] = psObject->padfX[0];
psSHP->adBoundsMin[1] = psSHP->adBoundsMax[1] = psObject->padfY[0];
psSHP->adBoundsMin[2] = psSHP->adBoundsMax[2] = psObject->padfZ ? psObject->padfZ[0] : 0.0;
psSHP->adBoundsMin[3] = psSHP->adBoundsMax[3] = psObject->padfM ? psObject->padfM[0] : 0.0;
}
}
for( i = 0; i < psObject->nVertices; i++ )
{
psSHP->adBoundsMin[0] = MIN(psSHP->adBoundsMin[0],psObject->padfX[i]);
psSHP->adBoundsMin[1] = MIN(psSHP->adBoundsMin[1],psObject->padfY[i]);
psSHP->adBoundsMax[0] = MAX(psSHP->adBoundsMax[0],psObject->padfX[i]);
psSHP->adBoundsMax[1] = MAX(psSHP->adBoundsMax[1],psObject->padfY[i]);
if( psObject->padfZ )
{
psSHP->adBoundsMin[2] = MIN(psSHP->adBoundsMin[2],psObject->padfZ[i]);
psSHP->adBoundsMax[2] = MAX(psSHP->adBoundsMax[2],psObject->padfZ[i]);
}
if( psObject->padfM )
{
psSHP->adBoundsMin[3] = MIN(psSHP->adBoundsMin[3],psObject->padfM[i]);
psSHP->adBoundsMax[3] = MAX(psSHP->adBoundsMax[3],psObject->padfM[i]);
}
}
return( nShapeId );
}
/************************************************************************/
/* SHPAllocBuffer() */
/************************************************************************/
static void* SHPAllocBuffer(unsigned char** pBuffer, int nSize)
{
unsigned char* pRet;
if( pBuffer == SHPLIB_NULLPTR )
return calloc(1, nSize);
pRet = *pBuffer;
if( pRet == SHPLIB_NULLPTR )
return SHPLIB_NULLPTR;
(*pBuffer) += nSize;
return pRet;
}
/************************************************************************/
/* SHPReallocObjectBufIfNecessary() */
/************************************************************************/
static unsigned char* SHPReallocObjectBufIfNecessary ( SHPHandle psSHP,
int nObjectBufSize )
{
unsigned char* pBuffer;
if( nObjectBufSize == 0 )
{
nObjectBufSize = 4 * sizeof(double);
}
if( nObjectBufSize > psSHP->nObjectBufSize )
{
pBuffer = STATIC_CAST(unsigned char*, realloc( psSHP->pabyObjectBuf, nObjectBufSize ));
if( pBuffer != SHPLIB_NULLPTR )
{
psSHP->pabyObjectBuf = pBuffer;
psSHP->nObjectBufSize = nObjectBufSize;
}
}
else
pBuffer = psSHP->pabyObjectBuf;
return pBuffer;
}
/************************************************************************/
/* SHPReadObject() */
/* */
/* Read the vertices, parts, and other non-attribute information */
/* for one shape. */
/************************************************************************/
SHPObject SHPAPI_CALL1(*)
SHPReadObject( SHPHandle psSHP, int hEntity )
{
int nEntitySize, nRequiredSize;
SHPObject *psShape;
char szErrorMsg[160];
int nSHPType;
int nBytesRead;
/* -------------------------------------------------------------------- */
/* Validate the record/entity number. */
/* -------------------------------------------------------------------- */
if( hEntity < 0 || hEntity >= psSHP->nRecords )
return SHPLIB_NULLPTR;
/* -------------------------------------------------------------------- */
/* Read offset/length from SHX loading if necessary. */
/* -------------------------------------------------------------------- */
if( psSHP->panRecOffset[hEntity] == 0 && psSHP->fpSHX != SHPLIB_NULLPTR )
{
unsigned int nOffset, nLength;
if( psSHP->sHooks.FSeek( psSHP->fpSHX, 100 + 8 * hEntity, 0 ) != 0 ||
psSHP->sHooks.FRead( &nOffset, 1, 4, psSHP->fpSHX ) != 4 ||
psSHP->sHooks.FRead( &nLength, 1, 4, psSHP->fpSHX ) != 4 )
{
char str[128];
snprintf( str, sizeof(str),
"Error in fseek()/fread() reading object from .shx file at offset %d",
100 + 8 * hEntity);
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
return SHPLIB_NULLPTR;
}
if( !bBigEndian ) SwapWord( 4, &nOffset );
if( !bBigEndian ) SwapWord( 4, &nLength );
if( nOffset > STATIC_CAST(unsigned int, INT_MAX) )
{
char str[128];
snprintf( str, sizeof(str),
"Invalid offset for entity %d", hEntity);
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
return SHPLIB_NULLPTR;
}
if( nLength > STATIC_CAST(unsigned int, INT_MAX / 2 - 4) )
{
char str[128];
snprintf( str, sizeof(str),
"Invalid length for entity %d", hEntity);
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
return SHPLIB_NULLPTR;
}
psSHP->panRecOffset[hEntity] = nOffset*2;
psSHP->panRecSize[hEntity] = nLength*2;
}
/* -------------------------------------------------------------------- */
/* Ensure our record buffer is large enough. */
/* -------------------------------------------------------------------- */
nEntitySize = psSHP->panRecSize[hEntity]+8;
if( nEntitySize > psSHP->nBufSize )
{
uchar* pabyRecNew;
int nNewBufSize = nEntitySize;
if( nNewBufSize < INT_MAX - nNewBufSize / 3 )
nNewBufSize += nNewBufSize / 3;
else
nNewBufSize = INT_MAX;
/* Before allocating too much memory, check that the file is big enough */
/* and do not trust the file size in the header the first time we */
/* need to allocate more than 10 MB */
if( nNewBufSize >= 10 * 1024 * 1024 )
{
if( psSHP->nBufSize < 10 * 1024 * 1024 )
{
SAOffset nFileSize;
psSHP->sHooks.FSeek( psSHP->fpSHP, 0, 2 );
nFileSize = psSHP->sHooks.FTell(psSHP->fpSHP);
if( nFileSize >= UINT_MAX )
psSHP->nFileSize = UINT_MAX;
else
psSHP->nFileSize = STATIC_CAST(unsigned int, nFileSize);
}
if( psSHP->panRecOffset[hEntity] >= psSHP->nFileSize ||
/* We should normally use nEntitySize instead of*/
/* psSHP->panRecSize[hEntity] in the below test, but because of */
/* the case of non conformant .shx files detailed a bit below, */
/* let be more tolerant */
psSHP->panRecSize[hEntity] > psSHP->nFileSize - psSHP->panRecOffset[hEntity] )
{
char str[128];
snprintf( str, sizeof(str),
"Error in fread() reading object of size %d at offset %u from .shp file",
nEntitySize, psSHP->panRecOffset[hEntity] );
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
return SHPLIB_NULLPTR;
}
}
pabyRecNew = STATIC_CAST(uchar *, SfRealloc(psSHP->pabyRec,nNewBufSize));
if (pabyRecNew == SHPLIB_NULLPTR)
{
snprintf( szErrorMsg, sizeof(szErrorMsg),
"Not enough memory to allocate requested memory (nNewBufSize=%d). "
"Probably broken SHP file", nNewBufSize);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
return SHPLIB_NULLPTR;
}
/* Only set new buffer size after successful alloc */
psSHP->pabyRec = pabyRecNew;
psSHP->nBufSize = nNewBufSize;
}
/* In case we were not able to reallocate the buffer on a previous step */
if (psSHP->pabyRec == SHPLIB_NULLPTR)
{
return SHPLIB_NULLPTR;
}
/* -------------------------------------------------------------------- */
/* Read the record. */
/* -------------------------------------------------------------------- */
if( psSHP->sHooks.FSeek( psSHP->fpSHP, psSHP->panRecOffset[hEntity], 0 ) != 0 )
{
/*
* TODO - mloskot: Consider detailed diagnostics of shape file,
* for example to detect if file is truncated.
*/
char str[128];
snprintf( str, sizeof(str),
"Error in fseek() reading object from .shp file at offset %u",
psSHP->panRecOffset[hEntity]);
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
return SHPLIB_NULLPTR;
}
nBytesRead = STATIC_CAST(int, psSHP->sHooks.FRead( psSHP->pabyRec, 1, nEntitySize, psSHP->fpSHP ));
/* Special case for a shapefile whose .shx content length field is not equal */
/* to the content length field of the .shp, which is a violation of "The */
/* content length stored in the index record is the same as the value stored in the main */
/* file record header." (http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf, page 24) */
/* Actually in that case the .shx content length is equal to the .shp content length + */
/* 4 (16 bit words), representing the 8 bytes of the record header... */
if( nBytesRead >= 8 && nBytesRead == nEntitySize - 8 )
{
/* Do a sanity check */
int nSHPContentLength;
memcpy( &nSHPContentLength, psSHP->pabyRec + 4, 4 );
if( !bBigEndian ) SwapWord( 4, &(nSHPContentLength) );
if( nSHPContentLength < 0 ||
nSHPContentLength > INT_MAX / 2 - 4 ||
2 * nSHPContentLength + 8 != nBytesRead )
{
char str[128];
snprintf( str, sizeof(str),
"Sanity check failed when trying to recover from inconsistent .shx/.shp with shape %d",
hEntity );
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
return SHPLIB_NULLPTR;
}
}
else if( nBytesRead != nEntitySize )
{
/*
* TODO - mloskot: Consider detailed diagnostics of shape file,
* for example to detect if file is truncated.
*/
char str[128];
snprintf( str, sizeof(str),
"Error in fread() reading object of size %d at offset %u from .shp file",
nEntitySize, psSHP->panRecOffset[hEntity] );
str[sizeof(str)-1] = '\0';
psSHP->sHooks.Error( str );
return SHPLIB_NULLPTR;
}
if ( 8 + 4 > nEntitySize )
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : nEntitySize = %d",
hEntity, nEntitySize);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
return SHPLIB_NULLPTR;
}
memcpy( &nSHPType, psSHP->pabyRec + 8, 4 );
if( bBigEndian ) SwapWord( 4, &(nSHPType) );
/* -------------------------------------------------------------------- */
/* Allocate and minimally initialize the object. */
/* -------------------------------------------------------------------- */
if( psSHP->bFastModeReadObject )
{
if( psSHP->psCachedObject->bFastModeReadObject )
{
psSHP->sHooks.Error( "Invalid read pattern in fast read mode. "
"SHPDestroyObject() should be called." );
return SHPLIB_NULLPTR;
}
psShape = psSHP->psCachedObject;
memset(psShape, 0, sizeof(SHPObject));
}
else
psShape = STATIC_CAST(SHPObject *, calloc(1,sizeof(SHPObject)));
psShape->nShapeId = hEntity;
psShape->nSHPType = nSHPType;
psShape->bMeasureIsUsed = FALSE;
psShape->bFastModeReadObject = psSHP->bFastModeReadObject;
/* ==================================================================== */
/* Extract vertices for a Polygon or Arc. */
/* ==================================================================== */
if( psShape->nSHPType == SHPT_POLYGON || psShape->nSHPType == SHPT_ARC
|| psShape->nSHPType == SHPT_POLYGONZ
|| psShape->nSHPType == SHPT_POLYGONM
|| psShape->nSHPType == SHPT_ARCZ
|| psShape->nSHPType == SHPT_ARCM
|| psShape->nSHPType == SHPT_MULTIPATCH )
{
int32 nPoints, nParts;
int i, nOffset;
unsigned char* pBuffer = SHPLIB_NULLPTR;
unsigned char** ppBuffer = SHPLIB_NULLPTR;
if ( 40 + 8 + 4 > nEntitySize )
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : nEntitySize = %d",
hEntity, nEntitySize);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
/* -------------------------------------------------------------------- */
/* Get the X/Y bounds. */
/* -------------------------------------------------------------------- */
memcpy( &(psShape->dfXMin), psSHP->pabyRec + 8 + 4, 8 );
memcpy( &(psShape->dfYMin), psSHP->pabyRec + 8 + 12, 8 );
memcpy( &(psShape->dfXMax), psSHP->pabyRec + 8 + 20, 8 );
memcpy( &(psShape->dfYMax), psSHP->pabyRec + 8 + 28, 8 );
if( bBigEndian ) SwapWord( 8, &(psShape->dfXMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfYMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfXMax) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfYMax) );
/* -------------------------------------------------------------------- */
/* Extract part/point count, and build vertex and part arrays */
/* to proper size. */
/* -------------------------------------------------------------------- */
memcpy( &nPoints, psSHP->pabyRec + 40 + 8, 4 );
memcpy( &nParts, psSHP->pabyRec + 36 + 8, 4 );
if( bBigEndian ) SwapWord( 4, &nPoints );
if( bBigEndian ) SwapWord( 4, &nParts );
/* nPoints and nParts are unsigned */
if (/* nPoints < 0 || nParts < 0 || */
nPoints > 50 * 1000 * 1000 || nParts > 10 * 1000 * 1000)
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d, nPoints=%u, nParts=%u.",
hEntity, nPoints, nParts);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
/* With the previous checks on nPoints and nParts, */
/* we should not overflow here and after */
/* since 50 M * (16 + 8 + 8) = 1 600 MB */
nRequiredSize = 44 + 8 + 4 * nParts + 16 * nPoints;
if ( psShape->nSHPType == SHPT_POLYGONZ
|| psShape->nSHPType == SHPT_ARCZ
|| psShape->nSHPType == SHPT_MULTIPATCH )
{
nRequiredSize += 16 + 8 * nPoints;
}
if( psShape->nSHPType == SHPT_MULTIPATCH )
{
nRequiredSize += 4 * nParts;
}
if (nRequiredSize > nEntitySize)
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d, nPoints=%u, nParts=%u, nEntitySize=%d.",
hEntity, nPoints, nParts, nEntitySize);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
if( psShape->bFastModeReadObject )
{
int nObjectBufSize = 4 * sizeof(double) * nPoints + 2 * sizeof(int) * nParts;
pBuffer = SHPReallocObjectBufIfNecessary(psSHP, nObjectBufSize);
ppBuffer = &pBuffer;
}
psShape->nVertices = nPoints;
psShape->padfX = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
psShape->padfY = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
psShape->padfZ = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
psShape->padfM = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
psShape->nParts = nParts;
psShape->panPartStart = STATIC_CAST(int *, SHPAllocBuffer(ppBuffer, nParts * sizeof(int)));
psShape->panPartType = STATIC_CAST(int *, SHPAllocBuffer(ppBuffer, nParts * sizeof(int)));
if (psShape->padfX == SHPLIB_NULLPTR ||
psShape->padfY == SHPLIB_NULLPTR ||
psShape->padfZ == SHPLIB_NULLPTR ||
psShape->padfM == SHPLIB_NULLPTR ||
psShape->panPartStart == SHPLIB_NULLPTR ||
psShape->panPartType == SHPLIB_NULLPTR)
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Not enough memory to allocate requested memory (nPoints=%u, nParts=%u) for shape %d. "
"Probably broken SHP file", nPoints, nParts, hEntity );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
for( i = 0; STATIC_CAST(int32, i) < nParts; i++ )
psShape->panPartType[i] = SHPP_RING;
/* -------------------------------------------------------------------- */
/* Copy out the part array from the record. */
/* -------------------------------------------------------------------- */
memcpy( psShape->panPartStart, psSHP->pabyRec + 44 + 8, 4 * nParts );
for( i = 0; STATIC_CAST(int32, i) < nParts; i++ )
{
if( bBigEndian ) SwapWord( 4, psShape->panPartStart+i );
/* We check that the offset is inside the vertex array */
if (psShape->panPartStart[i] < 0
|| (psShape->panPartStart[i] >= psShape->nVertices
&& psShape->nVertices > 0)
|| (psShape->panPartStart[i] > 0 && psShape->nVertices == 0) )
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : panPartStart[%d] = %d, nVertices = %d",
hEntity, i, psShape->panPartStart[i], psShape->nVertices);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
if (i > 0 && psShape->panPartStart[i] <= psShape->panPartStart[i-1])
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : panPartStart[%d] = %d, panPartStart[%d] = %d",
hEntity, i, psShape->panPartStart[i], i - 1, psShape->panPartStart[i - 1]);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
}
nOffset = 44 + 8 + 4*nParts;
/* -------------------------------------------------------------------- */
/* If this is a multipatch, we will also have parts types. */
/* -------------------------------------------------------------------- */
if( psShape->nSHPType == SHPT_MULTIPATCH )
{
memcpy( psShape->panPartType, psSHP->pabyRec + nOffset, 4*nParts );
for( i = 0; STATIC_CAST(int32, i) < nParts; i++ )
{
if( bBigEndian ) SwapWord( 4, psShape->panPartType+i );
}
nOffset += 4*nParts;
}
/* -------------------------------------------------------------------- */
/* Copy out the vertices from the record. */
/* -------------------------------------------------------------------- */
for( i = 0; STATIC_CAST(int32, i) < nPoints; i++ )
{
memcpy(psShape->padfX + i,
psSHP->pabyRec + nOffset + i * 16,
8 );
memcpy(psShape->padfY + i,
psSHP->pabyRec + nOffset + i * 16 + 8,
8 );
if( bBigEndian ) SwapWord( 8, psShape->padfX + i );
if( bBigEndian ) SwapWord( 8, psShape->padfY + i );
}
nOffset += 16*nPoints;
/* -------------------------------------------------------------------- */
/* If we have a Z coordinate, collect that now. */
/* -------------------------------------------------------------------- */
if( psShape->nSHPType == SHPT_POLYGONZ
|| psShape->nSHPType == SHPT_ARCZ
|| psShape->nSHPType == SHPT_MULTIPATCH )
{
memcpy( &(psShape->dfZMin), psSHP->pabyRec + nOffset, 8 );
memcpy( &(psShape->dfZMax), psSHP->pabyRec + nOffset + 8, 8 );
if( bBigEndian ) SwapWord( 8, &(psShape->dfZMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfZMax) );
for( i = 0; STATIC_CAST(int32, i) < nPoints; i++ )
{
memcpy( psShape->padfZ + i,
psSHP->pabyRec + nOffset + 16 + i*8, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfZ + i );
}
nOffset += 16 + 8*nPoints;
}
else if( psShape->bFastModeReadObject )
{
psShape->padfZ = SHPLIB_NULLPTR;
}
/* -------------------------------------------------------------------- */
/* If we have a M measure value, then read it now. We assume */
/* that the measure can be present for any shape if the size is */
/* big enough, but really it will only occur for the Z shapes */
/* (options), and the M shapes. */
/* -------------------------------------------------------------------- */
if( nEntitySize >= STATIC_CAST(int, nOffset + 16 + 8*nPoints) )
{
memcpy( &(psShape->dfMMin), psSHP->pabyRec + nOffset, 8 );
memcpy( &(psShape->dfMMax), psSHP->pabyRec + nOffset + 8, 8 );
if( bBigEndian ) SwapWord( 8, &(psShape->dfMMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfMMax) );
for( i = 0; STATIC_CAST(int32, i) < nPoints; i++ )
{
memcpy( psShape->padfM + i,
psSHP->pabyRec + nOffset + 16 + i*8, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfM + i );
}
psShape->bMeasureIsUsed = TRUE;
}
else if( psShape->bFastModeReadObject )
{
psShape->padfM = SHPLIB_NULLPTR;
}
}
/* ==================================================================== */
/* Extract vertices for a MultiPoint. */
/* ==================================================================== */
else if( psShape->nSHPType == SHPT_MULTIPOINT
|| psShape->nSHPType == SHPT_MULTIPOINTM
|| psShape->nSHPType == SHPT_MULTIPOINTZ )
{
int32 nPoints;
int i, nOffset;
unsigned char* pBuffer = SHPLIB_NULLPTR;
unsigned char** ppBuffer = SHPLIB_NULLPTR;
if ( 44 + 4 > nEntitySize )
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : nEntitySize = %d",
hEntity, nEntitySize);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
memcpy( &nPoints, psSHP->pabyRec + 44, 4 );
if( bBigEndian ) SwapWord( 4, &nPoints );
/* nPoints is unsigned */
if (/* nPoints < 0 || */ nPoints > 50 * 1000 * 1000)
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : nPoints = %u",
hEntity, nPoints);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
nRequiredSize = 48 + nPoints * 16;
if( psShape->nSHPType == SHPT_MULTIPOINTZ )
{
nRequiredSize += 16 + nPoints * 8;
}
if (nRequiredSize > nEntitySize)
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : nPoints = %u, nEntitySize = %d",
hEntity, nPoints, nEntitySize);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
if( psShape->bFastModeReadObject )
{
int nObjectBufSize = 4 * sizeof(double) * nPoints;
pBuffer = SHPReallocObjectBufIfNecessary(psSHP, nObjectBufSize);
ppBuffer = &pBuffer;
}
psShape->nVertices = nPoints;
psShape->padfX = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
psShape->padfY = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
psShape->padfZ = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
psShape->padfM = STATIC_CAST(double *, SHPAllocBuffer(ppBuffer, sizeof(double) * nPoints));
if (psShape->padfX == SHPLIB_NULLPTR ||
psShape->padfY == SHPLIB_NULLPTR ||
psShape->padfZ == SHPLIB_NULLPTR ||
psShape->padfM == SHPLIB_NULLPTR)
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Not enough memory to allocate requested memory (nPoints=%u) for shape %d. "
"Probably broken SHP file", nPoints, hEntity );
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
for( i = 0; STATIC_CAST(int32, i) < nPoints; i++ )
{
memcpy(psShape->padfX+i, psSHP->pabyRec + 48 + 16 * i, 8 );
memcpy(psShape->padfY+i, psSHP->pabyRec + 48 + 16 * i + 8, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfX + i );
if( bBigEndian ) SwapWord( 8, psShape->padfY + i );
}
nOffset = 48 + 16*nPoints;
/* -------------------------------------------------------------------- */
/* Get the X/Y bounds. */
/* -------------------------------------------------------------------- */
memcpy( &(psShape->dfXMin), psSHP->pabyRec + 8 + 4, 8 );
memcpy( &(psShape->dfYMin), psSHP->pabyRec + 8 + 12, 8 );
memcpy( &(psShape->dfXMax), psSHP->pabyRec + 8 + 20, 8 );
memcpy( &(psShape->dfYMax), psSHP->pabyRec + 8 + 28, 8 );
if( bBigEndian ) SwapWord( 8, &(psShape->dfXMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfYMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfXMax) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfYMax) );
/* -------------------------------------------------------------------- */
/* If we have a Z coordinate, collect that now. */
/* -------------------------------------------------------------------- */
if( psShape->nSHPType == SHPT_MULTIPOINTZ )
{
memcpy( &(psShape->dfZMin), psSHP->pabyRec + nOffset, 8 );
memcpy( &(psShape->dfZMax), psSHP->pabyRec + nOffset + 8, 8 );
if( bBigEndian ) SwapWord( 8, &(psShape->dfZMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfZMax) );
for( i = 0; STATIC_CAST(int32, i) < nPoints; i++ )
{
memcpy( psShape->padfZ + i,
psSHP->pabyRec + nOffset + 16 + i*8, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfZ + i );
}
nOffset += 16 + 8*nPoints;
}
else if( psShape->bFastModeReadObject )
psShape->padfZ = SHPLIB_NULLPTR;
/* -------------------------------------------------------------------- */
/* If we have a M measure value, then read it now. We assume */
/* that the measure can be present for any shape if the size is */
/* big enough, but really it will only occur for the Z shapes */
/* (options), and the M shapes. */
/* -------------------------------------------------------------------- */
if( nEntitySize >= STATIC_CAST(int, nOffset + 16 + 8*nPoints) )
{
memcpy( &(psShape->dfMMin), psSHP->pabyRec + nOffset, 8 );
memcpy( &(psShape->dfMMax), psSHP->pabyRec + nOffset + 8, 8 );
if( bBigEndian ) SwapWord( 8, &(psShape->dfMMin) );
if( bBigEndian ) SwapWord( 8, &(psShape->dfMMax) );
for( i = 0; STATIC_CAST(int32, i) < nPoints; i++ )
{
memcpy( psShape->padfM + i,
psSHP->pabyRec + nOffset + 16 + i*8, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfM + i );
}
psShape->bMeasureIsUsed = TRUE;
}
else if( psShape->bFastModeReadObject )
psShape->padfM = SHPLIB_NULLPTR;
}
/* ==================================================================== */
/* Extract vertices for a point. */
/* ==================================================================== */
else if( psShape->nSHPType == SHPT_POINT
|| psShape->nSHPType == SHPT_POINTM
|| psShape->nSHPType == SHPT_POINTZ )
{
int nOffset;
psShape->nVertices = 1;
if( psShape->bFastModeReadObject )
{
psShape->padfX = &(psShape->dfXMin);
psShape->padfY = &(psShape->dfYMin);
psShape->padfZ = &(psShape->dfZMin);
psShape->padfM = &(psShape->dfMMin);
psShape->padfZ[0] = 0.0;
psShape->padfM[0] = 0.0;
}
else
{
psShape->padfX = STATIC_CAST(double *, calloc(1,sizeof(double)));
psShape->padfY = STATIC_CAST(double *, calloc(1,sizeof(double)));
psShape->padfZ = STATIC_CAST(double *, calloc(1,sizeof(double)));
psShape->padfM = STATIC_CAST(double *, calloc(1,sizeof(double)));
}
if (20 + 8 + (( psShape->nSHPType == SHPT_POINTZ ) ? 8 : 0)> nEntitySize)
{
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Corrupted .shp file : shape %d : nEntitySize = %d",
hEntity, nEntitySize);
szErrorMsg[sizeof(szErrorMsg)-1] = '\0';
psSHP->sHooks.Error( szErrorMsg );
SHPDestroyObject(psShape);
return SHPLIB_NULLPTR;
}
memcpy( psShape->padfX, psSHP->pabyRec + 12, 8 );
memcpy( psShape->padfY, psSHP->pabyRec + 20, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfX );
if( bBigEndian ) SwapWord( 8, psShape->padfY );
nOffset = 20 + 8;
/* -------------------------------------------------------------------- */
/* If we have a Z coordinate, collect that now. */
/* -------------------------------------------------------------------- */
if( psShape->nSHPType == SHPT_POINTZ )
{
memcpy( psShape->padfZ, psSHP->pabyRec + nOffset, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfZ );
nOffset += 8;
}
/* -------------------------------------------------------------------- */
/* If we have a M measure value, then read it now. We assume */
/* that the measure can be present for any shape if the size is */
/* big enough, but really it will only occur for the Z shapes */
/* (options), and the M shapes. */
/* -------------------------------------------------------------------- */
if( nEntitySize >= nOffset + 8 )
{
memcpy( psShape->padfM, psSHP->pabyRec + nOffset, 8 );
if( bBigEndian ) SwapWord( 8, psShape->padfM );
psShape->bMeasureIsUsed = TRUE;
}
/* -------------------------------------------------------------------- */
/* Since no extents are supplied in the record, we will apply */
/* them from the single vertex. */
/* -------------------------------------------------------------------- */
psShape->dfXMin = psShape->dfXMax = psShape->padfX[0];
psShape->dfYMin = psShape->dfYMax = psShape->padfY[0];
psShape->dfZMin = psShape->dfZMax = psShape->padfZ[0];
psShape->dfMMin = psShape->dfMMax = psShape->padfM[0];
}
return( psShape );
}
/************************************************************************/
/* SHPTypeName() */
/************************************************************************/
const char SHPAPI_CALL1(*)
SHPTypeName( int nSHPType )
{
switch( nSHPType )
{
case SHPT_NULL:
return "NullShape";
case SHPT_POINT:
return "Point";
case SHPT_ARC:
return "Arc";
case SHPT_POLYGON:
return "Polygon";
case SHPT_MULTIPOINT:
return "MultiPoint";
case SHPT_POINTZ:
return "PointZ";
case SHPT_ARCZ:
return "ArcZ";
case SHPT_POLYGONZ:
return "PolygonZ";
case SHPT_MULTIPOINTZ:
return "MultiPointZ";
case SHPT_POINTM:
return "PointM";
case SHPT_ARCM:
return "ArcM";
case SHPT_POLYGONM:
return "PolygonM";
case SHPT_MULTIPOINTM:
return "MultiPointM";
case SHPT_MULTIPATCH:
return "MultiPatch";
default:
return "UnknownShapeType";
}
}
/************************************************************************/
/* SHPPartTypeName() */
/************************************************************************/
const char SHPAPI_CALL1(*)
SHPPartTypeName( int nPartType )
{
switch( nPartType )
{
case SHPP_TRISTRIP:
return "TriangleStrip";
case SHPP_TRIFAN:
return "TriangleFan";
case SHPP_OUTERRING:
return "OuterRing";
case SHPP_INNERRING:
return "InnerRing";
case SHPP_FIRSTRING:
return "FirstRing";
case SHPP_RING:
return "Ring";
default:
return "UnknownPartType";
}
}
/************************************************************************/
/* SHPDestroyObject() */
/************************************************************************/
void SHPAPI_CALL
SHPDestroyObject( SHPObject * psShape )
{
if( psShape == SHPLIB_NULLPTR )
return;
if( psShape->bFastModeReadObject )
{
psShape->bFastModeReadObject = FALSE;
return;
}
if( psShape->padfX != SHPLIB_NULLPTR )
free( psShape->padfX );
if( psShape->padfY != SHPLIB_NULLPTR )
free( psShape->padfY );
if( psShape->padfZ != SHPLIB_NULLPTR )
free( psShape->padfZ );
if( psShape->padfM != SHPLIB_NULLPTR )
free( psShape->padfM );
if( psShape->panPartStart != SHPLIB_NULLPTR )
free( psShape->panPartStart );
if( psShape->panPartType != SHPLIB_NULLPTR )
free( psShape->panPartType );
free( psShape );
}
/************************************************************************/
/* SHPGetPartVertexCount() */
/************************************************************************/
static int SHPGetPartVertexCount( const SHPObject * psObject, int iPart )
{
if( iPart == psObject->nParts-1 )
return psObject->nVertices - psObject->panPartStart[iPart];
else
return psObject->panPartStart[iPart+1] - psObject->panPartStart[iPart];
}
/************************************************************************/
/* SHPRewindIsInnerRing() */
/************************************************************************/
/* Return -1 in case of ambiguity */
static int SHPRewindIsInnerRing( const SHPObject * psObject,
int iOpRing,
double dfTestX, double dfTestY )
{
/* -------------------------------------------------------------------- */
/* Determine if this ring is an inner ring or an outer ring */
/* relative to all the other rings. For now we assume the */
/* first ring is outer and all others are inner, but eventually */
/* we need to fix this to handle multiple island polygons and */
/* unordered sets of rings. */
/* */
/* -------------------------------------------------------------------- */
int bInner = FALSE;
int iCheckRing;
for( iCheckRing = 0; iCheckRing < psObject->nParts; iCheckRing++ )
{
int nVertStartCheck, nVertCountCheck;
int iEdge;
if( iCheckRing == iOpRing )
continue;
nVertStartCheck = psObject->panPartStart[iCheckRing];
nVertCountCheck = SHPGetPartVertexCount(psObject, iCheckRing);
for( iEdge = 0; iEdge < nVertCountCheck; iEdge++ )
{
int iNext;
if( iEdge < nVertCountCheck-1 )
iNext = iEdge+1;
else
iNext = 0;
/* Rule #1:
* Test whether the edge 'straddles' the horizontal ray from
* the test point (dfTestY,dfTestY)
* The rule #1 also excludes edges colinear with the ray.
*/
if ( ( psObject->padfY[iEdge+nVertStartCheck] < dfTestY
&& dfTestY <= psObject->padfY[iNext+nVertStartCheck] )
|| ( psObject->padfY[iNext+nVertStartCheck] < dfTestY
&& dfTestY <= psObject->padfY[iEdge+nVertStartCheck] ) )
{
/* Rule #2:
* Test if edge-ray intersection is on the right from the
* test point (dfTestY,dfTestY)
*/
double const intersect =
( psObject->padfX[iEdge+nVertStartCheck]
+ ( dfTestY - psObject->padfY[iEdge+nVertStartCheck] )
/ ( psObject->padfY[iNext+nVertStartCheck] -
psObject->padfY[iEdge+nVertStartCheck] )
* ( psObject->padfX[iNext+nVertStartCheck] -
psObject->padfX[iEdge+nVertStartCheck] ) );
if (intersect < dfTestX)
{
bInner = !bInner;
}
else if( intersect == dfTestX )
{
/* Potential shared edge */
return -1;
}
}
}
} /* for iCheckRing */
return bInner;
}
/************************************************************************/
/* SHPRewindObject() */
/* */
/* Reset the winding of polygon objects to adhere to the */
/* specification. */
/************************************************************************/
int SHPAPI_CALL
SHPRewindObject( CPL_UNUSED SHPHandle hSHP,
SHPObject * psObject )
{
int iOpRing, bAltered = 0;
/* -------------------------------------------------------------------- */
/* Do nothing if this is not a polygon object. */
/* -------------------------------------------------------------------- */
if( psObject->nSHPType != SHPT_POLYGON
&& psObject->nSHPType != SHPT_POLYGONZ
&& psObject->nSHPType != SHPT_POLYGONM )
return 0;
if( psObject->nVertices == 0 || psObject->nParts == 0 )
return 0;
/* -------------------------------------------------------------------- */
/* Process each of the rings. */
/* -------------------------------------------------------------------- */
for( iOpRing = 0; iOpRing < psObject->nParts; iOpRing++ )
{
int bInner = FALSE;
int iVert;
double dfSum;
const int nVertStart = psObject->panPartStart[iOpRing];
const int nVertCount = SHPGetPartVertexCount(psObject, iOpRing);
if (nVertCount < 2)
continue;
for( iVert = nVertStart; iVert + 1 < nVertStart + nVertCount; ++iVert )
{
/* Use point in the middle of segment to avoid testing
* common points of rings.
*/
const double dfTestX = ( psObject->padfX[iVert] +
psObject->padfX[iVert + 1] ) / 2;
const double dfTestY = ( psObject->padfY[iVert] +
psObject->padfY[iVert + 1] ) / 2;
bInner = SHPRewindIsInnerRing(psObject, iOpRing, dfTestX, dfTestY);
if( bInner >= 0 )
break;
}
if( bInner < 0 )
{
/* Completely degenerate case. Do not bother touching order. */
continue;
}
/* -------------------------------------------------------------------- */
/* Determine the current order of this ring so we will know if */
/* it has to be reversed. */
/* -------------------------------------------------------------------- */
dfSum = psObject->padfX[nVertStart] *
(psObject->padfY[nVertStart+1] -
psObject->padfY[nVertStart+nVertCount-1]);
for( iVert = nVertStart + 1; iVert < nVertStart+nVertCount-1; iVert++ )
{
dfSum += psObject->padfX[iVert] * (psObject->padfY[iVert+1] -
psObject->padfY[iVert-1]);
}
dfSum += psObject->padfX[iVert] * (psObject->padfY[nVertStart] -
psObject->padfY[iVert-1]);
/* -------------------------------------------------------------------- */
/* Reverse if necessary. */
/* -------------------------------------------------------------------- */
if( (dfSum < 0.0 && bInner) || (dfSum > 0.0 && !bInner) )
{
int i;
bAltered++;
for( i = 0; i < nVertCount/2; i++ )
{
double dfSaved;
/* Swap X */
dfSaved = psObject->padfX[nVertStart+i];
psObject->padfX[nVertStart+i] =
psObject->padfX[nVertStart+nVertCount-i-1];
psObject->padfX[nVertStart+nVertCount-i-1] = dfSaved;
/* Swap Y */
dfSaved = psObject->padfY[nVertStart+i];
psObject->padfY[nVertStart+i] =
psObject->padfY[nVertStart+nVertCount-i-1];
psObject->padfY[nVertStart+nVertCount-i-1] = dfSaved;
/* Swap Z */
if( psObject->padfZ )
{
dfSaved = psObject->padfZ[nVertStart+i];
psObject->padfZ[nVertStart+i] =
psObject->padfZ[nVertStart+nVertCount-i-1];
psObject->padfZ[nVertStart+nVertCount-i-1] = dfSaved;
}
/* Swap M */
if( psObject->padfM )
{
dfSaved = psObject->padfM[nVertStart+i];
psObject->padfM[nVertStart+i] =
psObject->padfM[nVertStart+nVertCount-i-1];
psObject->padfM[nVertStart+nVertCount-i-1] = dfSaved;
}
}
}
}
return bAltered;
}
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