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dbfopen.c
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dbfopen.c
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/******************************************************************************
* $Id$
*
* Project: Shapelib
* Purpose: Implementation of .dbf access API documented in dbf_api.html.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
*
* This software is available under the following "MIT Style" license,
* or at the option of the licensee under the LGPL (see LICENSE.LGPL). 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.
******************************************************************************
*
* $Log: dbfopen.c,v $
* Revision 1.74 2007/12/06 07:00:25 fwarmerdam
* dbfopen now using SAHooks for fileio
*
* Revision 1.73 2007/09/03 19:48:11 fwarmerdam
* move DBFReadAttribute() static dDoubleField into dbfinfo
*
* Revision 1.72 2007/09/03 19:34:06 fwarmerdam
* Avoid use of static tuple buffer in DBFReadTuple()
*
* Revision 1.71 2006/06/22 14:37:18 fwarmerdam
* avoid memory leak if dbfopen fread fails
*
* Revision 1.70 2006/06/17 17:47:05 fwarmerdam
* use calloc() for dbfinfo in DBFCreate
*
* Revision 1.69 2006/06/17 15:34:32 fwarmerdam
* disallow creating fields wider than 255
*
* Revision 1.68 2006/06/17 15:12:40 fwarmerdam
* Fixed C++ style comments.
*
* Revision 1.67 2006/06/17 00:24:53 fwarmerdam
* Don't treat non-zero decimals values as high order byte for length
* for strings. It causes serious corruption for some files.
* http://bugzilla.remotesensing.org/show_bug.cgi?id=1202
*
* Revision 1.66 2006/03/29 18:26:20 fwarmerdam
* fixed bug with size of pachfieldtype in dbfcloneempty
*
* Revision 1.65 2006/02/15 01:14:30 fwarmerdam
* added DBFAddNativeFieldType
*
* Revision 1.64 2006/02/09 00:29:04 fwarmerdam
* Changed to put spaces into string fields that are NULL as
* per http://bugzilla.maptools.org/show_bug.cgi?id=316.
*
* Revision 1.63 2006/01/25 15:35:43 fwarmerdam
* check success on DBFFlushRecord
*
* Revision 1.62 2006/01/10 16:28:03 fwarmerdam
* Fixed typo in CPLError.
*
* Revision 1.61 2006/01/10 16:26:29 fwarmerdam
* Push loading record buffer into DBFLoadRecord.
* Implement CPL error reporting if USE_CPL defined.
*
* Revision 1.60 2006/01/05 01:27:27 fwarmerdam
* added dbf deletion mark/fetch
*
* Revision 1.59 2005/03/14 15:20:28 fwarmerdam
* Fixed last change.
*
* Revision 1.58 2005/03/14 15:18:54 fwarmerdam
* Treat very wide fields with no decimals as double. This is
* more than 32bit integer fields.
*
* Revision 1.57 2005/02/10 20:16:54 fwarmerdam
* Make the pszStringField buffer for DBFReadAttribute() static char [256]
* as per bug 306.
*
* Revision 1.56 2005/02/10 20:07:56 fwarmerdam
* Fixed bug 305 in DBFCloneEmpty() - header length problem.
*
* Revision 1.55 2004/09/26 20:23:46 fwarmerdam
* avoid warnings with rcsid and signed/unsigned stuff
*
* Revision 1.54 2004/09/15 16:26:10 fwarmerdam
* Treat all blank numeric fields as null too.
*/
#include <grass/shapefil.h>
#include <math.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
SHP_CVSID("$Id$")
#ifndef FALSE
# define FALSE 0
# define TRUE 1
#endif
/************************************************************************/
/* SfRealloc() */
/* */
/* A realloc cover function that will access a NULL pointer as */
/* a valid input. */
/************************************************************************/
static void * SfRealloc( void * pMem, int nNewSize )
{
if( pMem == NULL )
return( (void *) malloc(nNewSize) );
else
return( (void *) realloc(pMem,nNewSize) );
}
/************************************************************************/
/* DBFWriteHeader() */
/* */
/* This is called to write out the file header, and field */
/* descriptions before writing any actual data records. This */
/* also computes all the DBFDataSet field offset/size/decimals */
/* and so forth values. */
/************************************************************************/
static void DBFWriteHeader(DBFHandle psDBF)
{
unsigned char abyHeader[XBASE_FLDHDR_SZ];
int i;
if( !psDBF->bNoHeader )
return;
psDBF->bNoHeader = FALSE;
/* -------------------------------------------------------------------- */
/* Initialize the file header information. */
/* -------------------------------------------------------------------- */
for( i = 0; i < XBASE_FLDHDR_SZ; i++ )
abyHeader[i] = 0;
abyHeader[0] = 0x03; /* memo field? - just copying */
/* write out a dummy date */
abyHeader[1] = 95; /* YY */
abyHeader[2] = 7; /* MM */
abyHeader[3] = 26; /* DD */
/* record count preset at zero */
abyHeader[8] = (unsigned char) (psDBF->nHeaderLength % 256);
abyHeader[9] = (unsigned char) (psDBF->nHeaderLength / 256);
abyHeader[10] = (unsigned char) (psDBF->nRecordLength % 256);
abyHeader[11] = (unsigned char) (psDBF->nRecordLength / 256);
/* -------------------------------------------------------------------- */
/* Write the initial 32 byte file header, and all the field */
/* descriptions. */
/* -------------------------------------------------------------------- */
psDBF->sHooks.FSeek( psDBF->fp, 0, 0 );
psDBF->sHooks.FWrite( abyHeader, XBASE_FLDHDR_SZ, 1, psDBF->fp );
psDBF->sHooks.FWrite( psDBF->pszHeader, XBASE_FLDHDR_SZ, psDBF->nFields,
psDBF->fp );
/* -------------------------------------------------------------------- */
/* Write out the newline character if there is room for it. */
/* -------------------------------------------------------------------- */
if( psDBF->nHeaderLength > 32*psDBF->nFields + 32 )
{
char cNewline;
cNewline = 0x0d;
psDBF->sHooks.FWrite( &cNewline, 1, 1, psDBF->fp );
}
}
/************************************************************************/
/* DBFFlushRecord() */
/* */
/* Write out the current record if there is one. */
/************************************************************************/
static int DBFFlushRecord( DBFHandle psDBF )
{
SAOffset nRecordOffset;
if( psDBF->bCurrentRecordModified && psDBF->nCurrentRecord > -1 )
{
psDBF->bCurrentRecordModified = FALSE;
nRecordOffset =
psDBF->nRecordLength * (SAOffset) psDBF->nCurrentRecord
+ psDBF->nHeaderLength;
if( psDBF->sHooks.FSeek( psDBF->fp, nRecordOffset, 0 ) != 0
|| psDBF->sHooks.FWrite( psDBF->pszCurrentRecord,
psDBF->nRecordLength,
1, psDBF->fp ) != 1 )
{
#ifdef USE_CPL
CPLError( CE_Failure, CPLE_FileIO,
"Failure writing DBF record %d.",
psDBF->nCurrentRecord );
#else
fprintf( stderr, "Failure writing DBF record %d.",
psDBF->nCurrentRecord );
#endif
return FALSE;
}
}
return TRUE;
}
/************************************************************************/
/* DBFLoadRecord() */
/************************************************************************/
static int DBFLoadRecord( DBFHandle psDBF, int iRecord )
{
if( psDBF->nCurrentRecord != iRecord )
{
SAOffset nRecordOffset;
if( !DBFFlushRecord( psDBF ) )
return FALSE;
nRecordOffset =
psDBF->nRecordLength * (SAOffset) iRecord + psDBF->nHeaderLength;
if( psDBF->sHooks.FSeek( psDBF->fp, nRecordOffset, SEEK_SET ) != 0 )
{
#ifdef USE_CPL
CPLError( CE_Failure, CPLE_FileIO,
"fseek(%ld) failed on DBF file.\n",
(long) nRecordOffset );
#else
fprintf( stderr, "fseek(%ld) failed on DBF file.\n",
(long) nRecordOffset );
#endif
return FALSE;
}
if( psDBF->sHooks.FRead( psDBF->pszCurrentRecord,
psDBF->nRecordLength, 1, psDBF->fp ) != 1 )
{
#ifdef USE_CPL
CPLError( CE_Failure, CPLE_FileIO,
"fread(%d) failed on DBF file.\n",
psDBF->nRecordLength );
#else
fprintf( stderr, "fread(%d) failed on DBF file.\n",
psDBF->nRecordLength );
#endif
return FALSE;
}
psDBF->nCurrentRecord = iRecord;
}
return TRUE;
}
/************************************************************************/
/* DBFUpdateHeader() */
/************************************************************************/
void SHPAPI_CALL
DBFUpdateHeader( DBFHandle psDBF )
{
unsigned char abyFileHeader[32];
if( psDBF->bNoHeader )
DBFWriteHeader( psDBF );
DBFFlushRecord( psDBF );
psDBF->sHooks.FSeek( psDBF->fp, 0, 0 );
psDBF->sHooks.FRead( abyFileHeader, 32, 1, psDBF->fp );
abyFileHeader[4] = (unsigned char) (psDBF->nRecords % 256);
abyFileHeader[5] = (unsigned char) ((psDBF->nRecords/256) % 256);
abyFileHeader[6] = (unsigned char) ((psDBF->nRecords/(256*256)) % 256);
abyFileHeader[7] = (unsigned char) ((psDBF->nRecords/(256*256*256)) % 256);
psDBF->sHooks.FSeek( psDBF->fp, 0, 0 );
psDBF->sHooks.FWrite( abyFileHeader, 32, 1, psDBF->fp );
psDBF->sHooks.FFlush( psDBF->fp );
}
/************************************************************************/
/* DBFOpen() */
/* */
/* Open a .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL
DBFOpen( const char * pszFilename, const char * pszAccess )
{
SAHooks sHooks;
SASetupDefaultHooks( &sHooks );
return DBFOpenLL( pszFilename, pszAccess, &sHooks );
}
/************************************************************************/
/* DBFOpen() */
/* */
/* Open a .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL
DBFOpenLL( const char * pszFilename, const char * pszAccess, SAHooks *psHooks )
{
DBFHandle psDBF;
unsigned char *pabyBuf;
int nFields, nHeadLen, iField, i;
char *pszBasename, *pszFullname;
/* -------------------------------------------------------------------- */
/* We only allow the access strings "rb" and "r+". */
/* -------------------------------------------------------------------- */
if( strcmp(pszAccess,"r") != 0 && strcmp(pszAccess,"r+") != 0
&& strcmp(pszAccess,"rb") != 0 && strcmp(pszAccess,"rb+") != 0
&& strcmp(pszAccess,"r+b") != 0 )
return( NULL );
if( strcmp(pszAccess,"r") == 0 )
pszAccess = "rb";
if( strcmp(pszAccess,"r+") == 0 )
pszAccess = "rb+";
/* -------------------------------------------------------------------- */
/* Compute the base (layer) name. If there is any extension */
/* on the passed in filename we will strip it off. */
/* -------------------------------------------------------------------- */
pszBasename = (char *) malloc(strlen(pszFilename)+5);
strcpy( pszBasename, pszFilename );
for( i = strlen(pszBasename)-1;
i > 0 && pszBasename[i] != '.' && pszBasename[i] != '/'
&& pszBasename[i] != '\\';
i-- ) {}
if( pszBasename[i] == '.' )
pszBasename[i] = '\0';
pszFullname = (char *) malloc(strlen(pszBasename) + 5);
sprintf( pszFullname, "%s.dbf", pszBasename );
psDBF = (DBFHandle) calloc( 1, sizeof(DBFInfo) );
psDBF->fp = psHooks->FOpen( pszFullname, pszAccess );
memcpy( &(psDBF->sHooks), psHooks, sizeof(SAHooks) );
if( psDBF->fp == NULL )
{
sprintf( pszFullname, "%s.DBF", pszBasename );
psDBF->fp = psDBF->sHooks.FOpen(pszFullname, pszAccess );
}
free( pszBasename );
free( pszFullname );
if( psDBF->fp == NULL )
{
free( psDBF );
return( NULL );
}
psDBF->bNoHeader = FALSE;
psDBF->nCurrentRecord = -1;
psDBF->bCurrentRecordModified = FALSE;
/* -------------------------------------------------------------------- */
/* Read Table Header info */
/* -------------------------------------------------------------------- */
pabyBuf = (unsigned char *) malloc(500);
if( psDBF->sHooks.FRead( pabyBuf, 32, 1, psDBF->fp ) != 1 )
{
psDBF->sHooks.FClose( psDBF->fp );
free( pabyBuf );
free( psDBF );
return NULL;
}
psDBF->nRecords =
pabyBuf[4] + pabyBuf[5]*256 + pabyBuf[6]*256*256 + pabyBuf[7]*256*256*256;
psDBF->nHeaderLength = nHeadLen = pabyBuf[8] + pabyBuf[9]*256;
psDBF->nRecordLength = pabyBuf[10] + pabyBuf[11]*256;
psDBF->nFields = nFields = (nHeadLen - 32) / 32;
psDBF->pszCurrentRecord = (char *) malloc(psDBF->nRecordLength);
/* -------------------------------------------------------------------- */
/* Read in Field Definitions */
/* -------------------------------------------------------------------- */
pabyBuf = (unsigned char *) SfRealloc(pabyBuf,nHeadLen);
psDBF->pszHeader = (char *) pabyBuf;
psDBF->sHooks.FSeek( psDBF->fp, 32, 0 );
if( psDBF->sHooks.FRead( pabyBuf, nHeadLen-32, 1, psDBF->fp ) != 1 )
{
psDBF->sHooks.FClose( psDBF->fp );
free( pabyBuf );
free( psDBF->pszCurrentRecord );
free( psDBF );
return NULL;
}
psDBF->panFieldOffset = (int *) malloc(sizeof(int) * nFields);
psDBF->panFieldSize = (int *) malloc(sizeof(int) * nFields);
psDBF->panFieldDecimals = (int *) malloc(sizeof(int) * nFields);
psDBF->pachFieldType = (char *) malloc(sizeof(char) * nFields);
for( iField = 0; iField < nFields; iField++ )
{
unsigned char *pabyFInfo;
pabyFInfo = pabyBuf+iField*32;
if( pabyFInfo[11] == 'N' || pabyFInfo[11] == 'F' )
{
psDBF->panFieldSize[iField] = pabyFInfo[16];
psDBF->panFieldDecimals[iField] = pabyFInfo[17];
}
else
{
psDBF->panFieldSize[iField] = pabyFInfo[16];
psDBF->panFieldDecimals[iField] = 0;
/*
** The following seemed to be used sometimes to handle files with long
** string fields, but in other cases (such as bug 1202) the decimals field
** just seems to indicate some sort of preferred formatting, not very
** wide fields. So I have disabled this code. FrankW.
psDBF->panFieldSize[iField] = pabyFInfo[16] + pabyFInfo[17]*256;
psDBF->panFieldDecimals[iField] = 0;
*/
}
psDBF->pachFieldType[iField] = (char) pabyFInfo[11];
if( iField == 0 )
psDBF->panFieldOffset[iField] = 1;
else
psDBF->panFieldOffset[iField] =
psDBF->panFieldOffset[iField-1] + psDBF->panFieldSize[iField-1];
}
return( psDBF );
}
/************************************************************************/
/* DBFClose() */
/************************************************************************/
void SHPAPI_CALL
DBFClose(DBFHandle psDBF)
{
/* -------------------------------------------------------------------- */
/* Write out header if not already written. */
/* -------------------------------------------------------------------- */
if( psDBF->bNoHeader )
DBFWriteHeader( psDBF );
DBFFlushRecord( psDBF );
/* -------------------------------------------------------------------- */
/* Update last access date, and number of records if we have */
/* write access. */
/* -------------------------------------------------------------------- */
if( psDBF->bUpdated )
DBFUpdateHeader( psDBF );
/* -------------------------------------------------------------------- */
/* Close, and free resources. */
/* -------------------------------------------------------------------- */
psDBF->sHooks.FClose( psDBF->fp );
if( psDBF->panFieldOffset != NULL )
{
free( psDBF->panFieldOffset );
free( psDBF->panFieldSize );
free( psDBF->panFieldDecimals );
free( psDBF->pachFieldType );
}
if( psDBF->pszWorkField != NULL )
free( psDBF->pszWorkField );
free( psDBF->pszHeader );
free( psDBF->pszCurrentRecord );
free( psDBF );
}
/************************************************************************/
/* DBFCreate() */
/* */
/* Create a new .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL
DBFCreate( const char * pszFilename )
{
SAHooks sHooks;
SASetupDefaultHooks( &sHooks );
return DBFCreateLL( pszFilename, &sHooks );
}
/************************************************************************/
/* DBFCreate() */
/* */
/* Create a new .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL
DBFCreateLL( const char * pszFilename, SAHooks *psHooks )
{
DBFHandle psDBF;
SAFile fp;
char *pszFullname, *pszBasename;
int i;
char chZero = '\0';
/* -------------------------------------------------------------------- */
/* Compute the base (layer) name. If there is any extension */
/* on the passed in filename we will strip it off. */
/* -------------------------------------------------------------------- */
pszBasename = (char *) malloc(strlen(pszFilename)+5);
strcpy( pszBasename, pszFilename );
for( i = strlen(pszBasename)-1;
i > 0 && pszBasename[i] != '.' && pszBasename[i] != '/'
&& pszBasename[i] != '\\';
i-- ) {}
if( pszBasename[i] == '.' )
pszBasename[i] = '\0';
pszFullname = (char *) malloc(strlen(pszBasename) + 5);
sprintf( pszFullname, "%s.dbf", pszBasename );
free( pszBasename );
/* -------------------------------------------------------------------- */
/* Create the file. */
/* -------------------------------------------------------------------- */
fp = psHooks->FOpen( pszFullname, "wb" );
if( fp == NULL )
return( NULL );
psHooks->FWrite( &chZero, 1, 1, fp );
psHooks->FClose( fp );
fp = psHooks->FOpen( pszFullname, "rb+" );
if( fp == NULL )
return( NULL );
free( pszFullname );
/* -------------------------------------------------------------------- */
/* Create the info structure. */
/* -------------------------------------------------------------------- */
psDBF = (DBFHandle) calloc(1,sizeof(DBFInfo));
memcpy( &(psDBF->sHooks), psHooks, sizeof(SAHooks) );
psDBF->fp = fp;
psDBF->nRecords = 0;
psDBF->nFields = 0;
psDBF->nRecordLength = 1;
psDBF->nHeaderLength = 33;
psDBF->panFieldOffset = NULL;
psDBF->panFieldSize = NULL;
psDBF->panFieldDecimals = NULL;
psDBF->pachFieldType = NULL;
psDBF->pszHeader = NULL;
psDBF->nCurrentRecord = -1;
psDBF->bCurrentRecordModified = FALSE;
psDBF->pszCurrentRecord = NULL;
psDBF->bNoHeader = TRUE;
return( psDBF );
}
/************************************************************************/
/* DBFAddField() */
/* */
/* Add a field to a newly created .dbf file before any records */
/* are written. */
/************************************************************************/
int SHPAPI_CALL
DBFAddField(DBFHandle psDBF, const char * pszFieldName,
DBFFieldType eType, int nWidth, int nDecimals )
{
char chNativeType = 'C';
if( eType == FTLogical )
chNativeType = 'L';
else if( eType == FTString )
chNativeType = 'C';
else
chNativeType = 'N';
return DBFAddNativeFieldType( psDBF, pszFieldName, chNativeType,
nWidth, nDecimals );
}
/************************************************************************/
/* DBFAddField() */
/* */
/* Add a field to a newly created .dbf file before any records */
/* are written. */
/************************************************************************/
int SHPAPI_CALL
DBFAddNativeFieldType(DBFHandle psDBF, const char * pszFieldName,
char chType, int nWidth, int nDecimals )
{
char *pszFInfo;
int i;
/* -------------------------------------------------------------------- */
/* Do some checking to ensure we can add records to this file. */
/* -------------------------------------------------------------------- */
if( psDBF->nRecords > 0 )
return( -1 );
if( !psDBF->bNoHeader )
return( -1 );
if( nWidth < 1 )
return -1;
if( nWidth > 255 )
nWidth = 255;
/* -------------------------------------------------------------------- */
/* SfRealloc all the arrays larger to hold the additional field */
/* information. */
/* -------------------------------------------------------------------- */
psDBF->nFields++;
psDBF->panFieldOffset = (int *)
SfRealloc( psDBF->panFieldOffset, sizeof(int) * psDBF->nFields );
psDBF->panFieldSize = (int *)
SfRealloc( psDBF->panFieldSize, sizeof(int) * psDBF->nFields );
psDBF->panFieldDecimals = (int *)
SfRealloc( psDBF->panFieldDecimals, sizeof(int) * psDBF->nFields );
psDBF->pachFieldType = (char *)
SfRealloc( psDBF->pachFieldType, sizeof(char) * psDBF->nFields );
/* -------------------------------------------------------------------- */
/* Assign the new field information fields. */
/* -------------------------------------------------------------------- */
psDBF->panFieldOffset[psDBF->nFields-1] = psDBF->nRecordLength;
psDBF->nRecordLength += nWidth;
psDBF->panFieldSize[psDBF->nFields-1] = nWidth;
psDBF->panFieldDecimals[psDBF->nFields-1] = nDecimals;
psDBF->pachFieldType[psDBF->nFields-1] = chType;
/* -------------------------------------------------------------------- */
/* Extend the required header information. */
/* -------------------------------------------------------------------- */
psDBF->nHeaderLength += 32;
psDBF->bUpdated = FALSE;
psDBF->pszHeader = (char *) SfRealloc(psDBF->pszHeader,psDBF->nFields*32);
pszFInfo = psDBF->pszHeader + 32 * (psDBF->nFields-1);
for( i = 0; i < 32; i++ )
pszFInfo[i] = '\0';
if( (int) strlen(pszFieldName) < 10 )
strncpy( pszFInfo, pszFieldName, strlen(pszFieldName));
else
strncpy( pszFInfo, pszFieldName, 10);
pszFInfo[11] = psDBF->pachFieldType[psDBF->nFields-1];
if( chType == 'C' )
{
pszFInfo[16] = (unsigned char) (nWidth % 256);
pszFInfo[17] = (unsigned char) (nWidth / 256);
}
else
{
pszFInfo[16] = (unsigned char) nWidth;
pszFInfo[17] = (unsigned char) nDecimals;
}
/* -------------------------------------------------------------------- */
/* Make the current record buffer appropriately larger. */
/* -------------------------------------------------------------------- */
psDBF->pszCurrentRecord = (char *) SfRealloc(psDBF->pszCurrentRecord,
psDBF->nRecordLength);
return( psDBF->nFields-1 );
}
/************************************************************************/
/* DBFReadAttribute() */
/* */
/* Read one of the attribute fields of a record. */
/************************************************************************/
static void *DBFReadAttribute(DBFHandle psDBF, int hEntity, int iField,
char chReqType )
{
unsigned char *pabyRec;
void *pReturnField = NULL;
/* -------------------------------------------------------------------- */
/* Verify selection. */
/* -------------------------------------------------------------------- */
if( hEntity < 0 || hEntity >= psDBF->nRecords )
return( NULL );
if( iField < 0 || iField >= psDBF->nFields )
return( NULL );
/* -------------------------------------------------------------------- */
/* Have we read the record? */
/* -------------------------------------------------------------------- */
if( !DBFLoadRecord( psDBF, hEntity ) )
return NULL;
pabyRec = (unsigned char *) psDBF->pszCurrentRecord;
/* -------------------------------------------------------------------- */
/* Ensure we have room to extract the target field. */
/* -------------------------------------------------------------------- */
if( psDBF->panFieldSize[iField] >= psDBF->nWorkFieldLength )
{
psDBF->nWorkFieldLength = psDBF->panFieldSize[iField] + 100;
if( psDBF->pszWorkField == NULL )
psDBF->pszWorkField = (char *) malloc(psDBF->nWorkFieldLength);
else
psDBF->pszWorkField = (char *) realloc(psDBF->pszWorkField,
psDBF->nWorkFieldLength);
}
/* -------------------------------------------------------------------- */
/* Extract the requested field. */
/* -------------------------------------------------------------------- */
strncpy( psDBF->pszWorkField,
((const char *) pabyRec) + psDBF->panFieldOffset[iField],
psDBF->panFieldSize[iField] );
psDBF->pszWorkField[psDBF->panFieldSize[iField]] = '\0';
pReturnField = psDBF->pszWorkField;
/* -------------------------------------------------------------------- */
/* Decode the field. */
/* -------------------------------------------------------------------- */
if( chReqType == 'N' )
{
psDBF->dfDoubleField = atof(psDBF->pszWorkField);
pReturnField = &(psDBF->dfDoubleField);
}
/* -------------------------------------------------------------------- */
/* Should we trim white space off the string attribute value? */
/* -------------------------------------------------------------------- */
#ifdef TRIM_DBF_WHITESPACE
else
{
char *pchSrc, *pchDst;
pchDst = pchSrc = psDBF->pszWorkField;
while( *pchSrc == ' ' )
pchSrc++;
while( *pchSrc != '\0' )
*(pchDst++) = *(pchSrc++);
*pchDst = '\0';
while( pchDst != psDBF->pszWorkField && *(--pchDst) == ' ' )
*pchDst = '\0';
}
#endif
return( pReturnField );
}
/************************************************************************/
/* DBFReadIntAttribute() */
/* */
/* Read an integer attribute. */
/************************************************************************/
int SHPAPI_CALL
DBFReadIntegerAttribute( DBFHandle psDBF, int iRecord, int iField )
{
double *pdValue;
pdValue = (double *) DBFReadAttribute( psDBF, iRecord, iField, 'N' );
if( pdValue == NULL )
return 0;
else
return( (int) *pdValue );
}
/************************************************************************/
/* DBFReadDoubleAttribute() */
/* */
/* Read a double attribute. */
/************************************************************************/
double SHPAPI_CALL
DBFReadDoubleAttribute( DBFHandle psDBF, int iRecord, int iField )
{
double *pdValue;
pdValue = (double *) DBFReadAttribute( psDBF, iRecord, iField, 'N' );
if( pdValue == NULL )
return 0.0;
else
return( *pdValue );
}
/************************************************************************/
/* DBFReadStringAttribute() */
/* */
/* Read a string attribute. */
/************************************************************************/
const char SHPAPI_CALL1(*)
DBFReadStringAttribute( DBFHandle psDBF, int iRecord, int iField )
{
return( (const char *) DBFReadAttribute( psDBF, iRecord, iField, 'C' ) );
}
/************************************************************************/
/* DBFReadLogicalAttribute() */
/* */
/* Read a logical attribute. */
/************************************************************************/
const char SHPAPI_CALL1(*)
DBFReadLogicalAttribute( DBFHandle psDBF, int iRecord, int iField )
{
return( (const char *) DBFReadAttribute( psDBF, iRecord, iField, 'L' ) );
}
/************************************************************************/
/* DBFIsAttributeNULL() */
/* */
/* Return TRUE if value for field is NULL. */
/* */
/* Contributed by Jim Matthews. */
/************************************************************************/
int SHPAPI_CALL
DBFIsAttributeNULL( DBFHandle psDBF, int iRecord, int iField )
{
const char *pszValue;
int i;
pszValue = DBFReadStringAttribute( psDBF, iRecord, iField );
if( pszValue == NULL )
return TRUE;
switch(psDBF->pachFieldType[iField])
{
case 'N':
case 'F':
/*
** We accept all asterisks or all blanks as NULL
** though according to the spec I think it should be all
** asterisks.
*/
if( pszValue[0] == '*' )
return TRUE;
for( i = 0; pszValue[i] != '\0'; i++ )
{
if( pszValue[i] != ' ' )
return FALSE;
}
return TRUE;
case 'D':
/* NULL date fields have value "00000000" */
return strncmp(pszValue,"00000000",8) == 0;
case 'L':
/* NULL boolean fields have value "?" */
return pszValue[0] == '?';
default:
/* empty string fields are considered NULL */
return strlen(pszValue) == 0;
}
}
/************************************************************************/
/* DBFGetFieldCount() */
/* */
/* Return the number of fields in this table. */
/************************************************************************/
int SHPAPI_CALL
DBFGetFieldCount( DBFHandle psDBF )
{
return( psDBF->nFields );
}
/************************************************************************/
/* DBFGetRecordCount() */
/* */
/* Return the number of records in this table. */
/************************************************************************/
int SHPAPI_CALL
DBFGetRecordCount( DBFHandle psDBF )
{
return( psDBF->nRecords );
}
/************************************************************************/
/* DBFGetFieldInfo() */
/* */
/* Return any requested information about the field. */
/************************************************************************/
DBFFieldType SHPAPI_CALL
DBFGetFieldInfo( DBFHandle psDBF, int iField, char * pszFieldName,
int * pnWidth, int * pnDecimals )
{
if( iField < 0 || iField >= psDBF->nFields )
return( FTInvalid );
if( pnWidth != NULL )
*pnWidth = psDBF->panFieldSize[iField];
if( pnDecimals != NULL )
*pnDecimals = psDBF->panFieldDecimals[iField];
if( pszFieldName != NULL )
{
int i;
strncpy( pszFieldName, (char *) psDBF->pszHeader+iField*32, 11 );