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shpopen.c
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/******************************************************************************
*
* Project: Shapelib
* Purpose: Implementation of core Shapefile read/write functions.
* Author: Frank Warmerdam, [email protected]
*
******************************************************************************
* 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 <assert.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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 bool 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 ) {
for( int i = 0; i < length/2; i++ )
{
const uchar 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;
}
}
/************************************************************************/
/* 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 ) {
if (psSHP->fpSHX == SHPLIB_NULLPTR)
{
psSHP->sHooks.Error( "SHPWriteHeader failed : SHX file is closed");
return;
}
/* -------------------------------------------------------------------- */
/* Prepare header block for .shp file. */
/* -------------------------------------------------------------------- */
uchar abyHeader[100] = { 0 };
abyHeader[2] = 0x27; /* magic cookie */
abyHeader[3] = 0x0a;
int32 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 );
double 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. */
/* -------------------------------------------------------------------- */
int32 *panSHX = STATIC_CAST(int32 *, malloc(sizeof(int32) * 2 * psSHP->nRecords));
if( panSHX == SHPLIB_NULLPTR )
{
psSHP->sHooks.Error( "Failure allocatin panSHX" );
return;
}
for( int 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)
{
const int nLen = STATIC_CAST(int, strlen(pszBasename));
for( int 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 ) {
/* -------------------------------------------------------------------- */
/* Ensure the access string is one of the legal ones. We */
/* ensure the result string indicates binary to avoid common */
/* problems on Windows. */
/* -------------------------------------------------------------------- */
bool bLazySHXLoading = false;
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)
{
int i = 1;
if( *((uchar *) &i) == 1 )
bBigEndian = false;
else
bBigEndian = true;
}
#endif
/* -------------------------------------------------------------------- */
/* Initialize the info structure. */
/* -------------------------------------------------------------------- */
SHPHandle 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! */
/* -------------------------------------------------------------------- */
const int nLenWithoutExtension = SHPGetLenWithoutExtension(pszLayer);
char *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 )
{
const 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 )
{
const 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. */
/* -------------------------------------------------------------------- */
uchar *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 .shx 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 )
{
psSHP->sHooks.FSeek( psSHP->fpSHX, 0, 2 );
const SAOffset 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. */
/* -------------------------------------------------------------------- */
double dValue;
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( int i = 0; i < psSHP->nRecords; i++ )
{
unsigned int nOffset;
memcpy( &nOffset, pabyBuf + i * 8, 4 );
if( !bBigEndian ) SwapWord( 4, &nOffset );
unsigned int nLength;
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 ) {
/* -------------------------------------------------------------------- */
/* 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! */
/* -------------------------------------------------------------------- */
const int nLenWithoutExtension = SHPGetLenWithoutExtension(pszLayer);
char *pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
memcpy(pszFullname, pszLayer, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".shp", 5);
SAFile fpSHP = psHooks->FOpen(pszFullname, pszAccess );
if( fpSHP == SHPLIB_NULLPTR )
{
memcpy(pszFullname + nLenWithoutExtension, ".SHP", 5);
fpSHP = psHooks->FOpen(pszFullname, pszAccess );
}
if( fpSHP == SHPLIB_NULLPTR )
{
const 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. */
/* -------------------------------------------------------------------- */
uchar *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 );
}
unsigned int 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);
const char pszSHXAccess[] = "w+b";
SAFile 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 );
char *pabySHXHeader = STATIC_CAST(char *, malloc ( 100 ));
memcpy( pabySHXHeader, pabyBuf, 100 );
psHooks->FWrite( pabySHXHeader, 100, 1, fpSHX );
free ( pabyBuf );
// unsigned int nCurrentRecordOffset = 0;
unsigned int nCurrentSHPOffset = 100;
unsigned int nRealSHXContentSize = 100;
unsigned int niRecord = 0;
unsigned int nRecordLength = 0;
unsigned int nRecordOffset = 50;
char abyReadedRecord[8];
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;
// nCurrentRecordOffset += 8;
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 ) {
if( psSHP == SHPLIB_NULLPTR )
return;
if( pnEntities != SHPLIB_NULLPTR )
*pnEntities = psSHP->nRecords;
if( pnShapeType != SHPLIB_NULLPTR )
*pnShapeType = psSHP->nShapeType;
for( int 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 ) {
/* -------------------------------------------------------------------- */
/* 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. */
/* -------------------------------------------------------------------- */
const int nLenWithoutExtension = SHPGetLenWithoutExtension(pszLayer);
char *pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
memcpy(pszFullname, pszLayer, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".shp", 5);
SAFile 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 );
free(pszFullname);
return NULL;
}
memcpy(pszFullname + nLenWithoutExtension, ".shx", 5);
SAFile 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 );
free(pszFullname);
psHooks->FClose(fpSHP);
return NULL;
}
free( pszFullname );
pszFullname = SHPLIB_NULLPTR;
/* -------------------------------------------------------------------- */
/* Prepare header block for .shp file. */
/* -------------------------------------------------------------------- */
uchar abyHeader[100];
memset( abyHeader, 0, sizeof(abyHeader) );
abyHeader[2] = 0x27; /* magic cookie */
abyHeader[3] = 0x0a;
int32 i32 = 50; /* file size */
ByteCopy( &i32, abyHeader+24, 4 );
if( !bBigEndian ) SwapWord( 4, abyHeader+24 );