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dbfopen.c
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dbfopen.c
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/******************************************************************************
*
* Project: Shapelib
* Purpose: Implementation of .dbf access API documented in dbf_api.html.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, Frank Warmerdam
* Copyright (c) 2012-2024, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
******************************************************************************/
#include "shapefil_private.h"
#include <math.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#ifdef USE_CPL
#include "cpl_string.h"
#else
#if defined(_MSC_VER)
#define STRCASECMP(a, b) (_stricmp(a, b))
#elif defined(_WIN32)
#define STRCASECMP(a, b) (stricmp(a, b))
#else
#include <strings.h>
#define STRCASECMP(a, b) (strcasecmp(a, b))
#endif
#if defined(_MSC_VER)
#if _MSC_VER < 1900
#define snprintf _snprintf
#endif
#elif defined(_WIN32)
#ifndef snprintf
#define snprintf _snprintf
#endif
#endif
#define CPLsprintf sprintf
#define CPLsnprintf snprintf
#endif
#ifndef FALSE
#define FALSE 0
#define TRUE 1
#endif
/* File header size */
#define XBASE_FILEHDR_SZ 32
#define HEADER_RECORD_TERMINATOR 0x0D
/* See http://www.manmrk.net/tutorials/database/xbase/dbf.html */
#define END_OF_FILE_CHARACTER 0x1A
#ifdef USE_CPL
CPL_INLINE static void CPL_IGNORE_RET_VAL_INT(CPL_UNUSED int unused)
{
}
#else
#define CPL_IGNORE_RET_VAL_INT(x) x
#endif
/************************************************************************/
/* 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_FILEHDR_SZ] = {0};
if (!psDBF->bNoHeader)
return;
psDBF->bNoHeader = FALSE;
/* -------------------------------------------------------------------- */
/* Initialize the file header information. */
/* -------------------------------------------------------------------- */
abyHeader[0] = 0x03; /* memo field? - just copying */
/* write out update date */
abyHeader[1] = STATIC_CAST(unsigned char, psDBF->nUpdateYearSince1900);
abyHeader[2] = STATIC_CAST(unsigned char, psDBF->nUpdateMonth);
abyHeader[3] = STATIC_CAST(unsigned char, psDBF->nUpdateDay);
/* record count preset at zero */
abyHeader[8] = STATIC_CAST(unsigned char, psDBF->nHeaderLength % 256);
abyHeader[9] = STATIC_CAST(unsigned char, psDBF->nHeaderLength / 256);
abyHeader[10] = STATIC_CAST(unsigned char, psDBF->nRecordLength % 256);
abyHeader[11] = STATIC_CAST(unsigned char, psDBF->nRecordLength / 256);
abyHeader[29] = STATIC_CAST(unsigned char, psDBF->iLanguageDriver);
/* -------------------------------------------------------------------- */
/* Write the initial 32 byte file header, and all the field */
/* descriptions. */
/* -------------------------------------------------------------------- */
psDBF->sHooks.FSeek(psDBF->fp, 0, 0);
psDBF->sHooks.FWrite(abyHeader, XBASE_FILEHDR_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 >
XBASE_FLDHDR_SZ * psDBF->nFields + XBASE_FLDHDR_SZ)
{
char cNewline = HEADER_RECORD_TERMINATOR;
psDBF->sHooks.FWrite(&cNewline, 1, 1, psDBF->fp);
}
/* -------------------------------------------------------------------- */
/* If the file is new, add a EOF character. */
/* -------------------------------------------------------------------- */
if (psDBF->nRecords == 0 && psDBF->bWriteEndOfFileChar)
{
char ch = END_OF_FILE_CHARACTER;
psDBF->sHooks.FWrite(&ch, 1, 1, psDBF->fp);
}
}
/************************************************************************/
/* DBFFlushRecord() */
/* */
/* Write out the current record if there is one. */
/************************************************************************/
static bool DBFFlushRecord(DBFHandle psDBF)
{
if (psDBF->bCurrentRecordModified && psDBF->nCurrentRecord > -1)
{
psDBF->bCurrentRecordModified = FALSE;
const SAOffset nRecordOffset =
psDBF->nRecordLength *
STATIC_CAST(SAOffset, psDBF->nCurrentRecord) +
psDBF->nHeaderLength;
/* -------------------------------------------------------------------- */
/* Guard FSeek with check for whether we're already at position; */
/* no-op FSeeks defeat network filesystems' write buffering. */
/* -------------------------------------------------------------------- */
if (psDBF->bRequireNextWriteSeek ||
psDBF->sHooks.FTell(psDBF->fp) != nRecordOffset)
{
if (psDBF->sHooks.FSeek(psDBF->fp, nRecordOffset, 0) != 0)
{
char szMessage[128];
snprintf(
szMessage, sizeof(szMessage),
"Failure seeking to position before writing DBF record %d.",
psDBF->nCurrentRecord);
psDBF->sHooks.Error(szMessage);
return false;
}
}
if (psDBF->sHooks.FWrite(psDBF->pszCurrentRecord, psDBF->nRecordLength,
1, psDBF->fp) != 1)
{
char szMessage[128];
snprintf(szMessage, sizeof(szMessage),
"Failure writing DBF record %d.", psDBF->nCurrentRecord);
psDBF->sHooks.Error(szMessage);
return false;
}
/* -------------------------------------------------------------------- */
/* If next op is also a write, allow possible skipping of FSeek. */
/* -------------------------------------------------------------------- */
psDBF->bRequireNextWriteSeek = FALSE;
if (psDBF->nCurrentRecord == psDBF->nRecords - 1)
{
if (psDBF->bWriteEndOfFileChar)
{
char ch = END_OF_FILE_CHARACTER;
psDBF->sHooks.FWrite(&ch, 1, 1, psDBF->fp);
}
}
}
return true;
}
/************************************************************************/
/* DBFLoadRecord() */
/************************************************************************/
static bool DBFLoadRecord(DBFHandle psDBF, int iRecord)
{
if (psDBF->nCurrentRecord != iRecord)
{
if (!DBFFlushRecord(psDBF))
return false;
const SAOffset nRecordOffset =
psDBF->nRecordLength * STATIC_CAST(SAOffset, iRecord) +
psDBF->nHeaderLength;
if (psDBF->sHooks.FSeek(psDBF->fp, nRecordOffset, SEEK_SET) != 0)
{
char szMessage[128];
snprintf(szMessage, sizeof(szMessage),
"fseek(%ld) failed on DBF file.",
STATIC_CAST(long, nRecordOffset));
psDBF->sHooks.Error(szMessage);
return false;
}
if (psDBF->sHooks.FRead(psDBF->pszCurrentRecord, psDBF->nRecordLength,
1, psDBF->fp) != 1)
{
char szMessage[128];
snprintf(szMessage, sizeof(szMessage),
"fread(%d) failed on DBF file.", psDBF->nRecordLength);
psDBF->sHooks.Error(szMessage);
return false;
}
psDBF->nCurrentRecord = iRecord;
/* -------------------------------------------------------------------- */
/* Require a seek for next write in case of mixed R/W operations. */
/* -------------------------------------------------------------------- */
psDBF->bRequireNextWriteSeek = TRUE;
}
return true;
}
/************************************************************************/
/* DBFUpdateHeader() */
/************************************************************************/
void SHPAPI_CALL DBFUpdateHeader(DBFHandle psDBF)
{
if (psDBF->bNoHeader)
DBFWriteHeader(psDBF);
if (!DBFFlushRecord(psDBF))
return;
psDBF->sHooks.FSeek(psDBF->fp, 0, 0);
unsigned char abyFileHeader[XBASE_FILEHDR_SZ] = {0};
psDBF->sHooks.FRead(abyFileHeader, 1, sizeof(abyFileHeader), psDBF->fp);
abyFileHeader[1] = STATIC_CAST(unsigned char, psDBF->nUpdateYearSince1900);
abyFileHeader[2] = STATIC_CAST(unsigned char, psDBF->nUpdateMonth);
abyFileHeader[3] = STATIC_CAST(unsigned char, psDBF->nUpdateDay);
abyFileHeader[4] = STATIC_CAST(unsigned char, psDBF->nRecords & 0xFF);
abyFileHeader[5] =
STATIC_CAST(unsigned char, (psDBF->nRecords >> 8) & 0xFF);
abyFileHeader[6] =
STATIC_CAST(unsigned char, (psDBF->nRecords >> 16) & 0xFF);
abyFileHeader[7] =
STATIC_CAST(unsigned char, (psDBF->nRecords >> 24) & 0xFF);
psDBF->sHooks.FSeek(psDBF->fp, 0, 0);
psDBF->sHooks.FWrite(abyFileHeader, sizeof(abyFileHeader), 1, psDBF->fp);
psDBF->sHooks.FFlush(psDBF->fp);
}
/************************************************************************/
/* DBFSetLastModifiedDate() */
/************************************************************************/
void SHPAPI_CALL DBFSetLastModifiedDate(DBFHandle psDBF, int nYYSince1900,
int nMM, int nDD)
{
psDBF->nUpdateYearSince1900 = nYYSince1900;
psDBF->nUpdateMonth = nMM;
psDBF->nUpdateDay = nDD;
}
/************************************************************************/
/* DBFOpen() */
/* */
/* Open a .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL DBFOpen(const char *pszFilename, const char *pszAccess)
{
SAHooks sHooks;
SASetupDefaultHooks(&sHooks);
return DBFOpenLL(pszFilename, pszAccess, &sHooks);
}
/************************************************************************/
/* DBFGetLenWithoutExtension() */
/************************************************************************/
static int DBFGetLenWithoutExtension(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;
}
/************************************************************************/
/* DBFOpen() */
/* */
/* Open a .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL DBFOpenLL(const char *pszFilename, const char *pszAccess,
const SAHooks *psHooks)
{
/* -------------------------------------------------------------------- */
/* 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 SHPLIB_NULLPTR;
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. */
/* -------------------------------------------------------------------- */
const int nLenWithoutExtension = DBFGetLenWithoutExtension(pszFilename);
char *pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
memcpy(pszFullname, pszFilename, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".dbf", 5);
DBFHandle psDBF = STATIC_CAST(DBFHandle, calloc(1, sizeof(DBFInfo)));
psDBF->fp = psHooks->FOpen(pszFullname, pszAccess, psHooks->pvUserData);
memcpy(&(psDBF->sHooks), psHooks, sizeof(SAHooks));
if (psDBF->fp == SHPLIB_NULLPTR)
{
memcpy(pszFullname + nLenWithoutExtension, ".DBF", 5);
psDBF->fp =
psDBF->sHooks.FOpen(pszFullname, pszAccess, psHooks->pvUserData);
}
memcpy(pszFullname + nLenWithoutExtension, ".cpg", 5);
SAFile pfCPG = psHooks->FOpen(pszFullname, "r", psHooks->pvUserData);
if (pfCPG == SHPLIB_NULLPTR)
{
memcpy(pszFullname + nLenWithoutExtension, ".CPG", 5);
pfCPG = psHooks->FOpen(pszFullname, "r", psHooks->pvUserData);
}
free(pszFullname);
if (psDBF->fp == SHPLIB_NULLPTR)
{
free(psDBF);
if (pfCPG)
psHooks->FClose(pfCPG);
return SHPLIB_NULLPTR;
}
psDBF->bNoHeader = FALSE;
psDBF->nCurrentRecord = -1;
psDBF->bCurrentRecordModified = FALSE;
/* -------------------------------------------------------------------- */
/* Read Table Header info */
/* -------------------------------------------------------------------- */
const int nBufSize = 500;
unsigned char *pabyBuf = STATIC_CAST(unsigned char *, malloc(nBufSize));
if (psDBF->sHooks.FRead(pabyBuf, XBASE_FILEHDR_SZ, 1, psDBF->fp) != 1)
{
psDBF->sHooks.FClose(psDBF->fp);
if (pfCPG)
psDBF->sHooks.FClose(pfCPG);
free(pabyBuf);
free(psDBF);
return SHPLIB_NULLPTR;
}
DBFSetLastModifiedDate(psDBF, pabyBuf[1], pabyBuf[2], pabyBuf[3]);
psDBF->nRecords = pabyBuf[4] | (pabyBuf[5] << 8) | (pabyBuf[6] << 16) |
((pabyBuf[7] & 0x7f) << 24);
const int nHeadLen = pabyBuf[8] | (pabyBuf[9] << 8);
psDBF->nHeaderLength = nHeadLen;
psDBF->nRecordLength = pabyBuf[10] | (pabyBuf[11] << 8);
psDBF->iLanguageDriver = pabyBuf[29];
if (psDBF->nRecordLength == 0 || nHeadLen < XBASE_FILEHDR_SZ)
{
psDBF->sHooks.FClose(psDBF->fp);
if (pfCPG)
psDBF->sHooks.FClose(pfCPG);
free(pabyBuf);
free(psDBF);
return SHPLIB_NULLPTR;
}
const int nFields = (nHeadLen - XBASE_FILEHDR_SZ) / XBASE_FLDHDR_SZ;
psDBF->nFields = nFields;
/* coverity[tainted_data] */
psDBF->pszCurrentRecord = STATIC_CAST(char *, malloc(psDBF->nRecordLength));
/* -------------------------------------------------------------------- */
/* Figure out the code page from the LDID and CPG */
/* -------------------------------------------------------------------- */
psDBF->pszCodePage = SHPLIB_NULLPTR;
if (pfCPG)
{
memset(pabyBuf, 0, nBufSize);
psDBF->sHooks.FRead(pabyBuf, 1, nBufSize - 1, pfCPG);
const size_t n = strcspn(REINTERPRET_CAST(char *, pabyBuf), "\n\r");
if (n > 0)
{
pabyBuf[n] = '\0';
psDBF->pszCodePage = STATIC_CAST(char *, malloc(n + 1));
memcpy(psDBF->pszCodePage, pabyBuf, n + 1);
}
psDBF->sHooks.FClose(pfCPG);
}
if (psDBF->pszCodePage == SHPLIB_NULLPTR && pabyBuf[29] != 0)
{
snprintf(REINTERPRET_CAST(char *, pabyBuf), nBufSize, "LDID/%d",
psDBF->iLanguageDriver);
psDBF->pszCodePage = STATIC_CAST(
char *, malloc(strlen(REINTERPRET_CAST(char *, pabyBuf)) + 1));
strcpy(psDBF->pszCodePage, REINTERPRET_CAST(char *, pabyBuf));
}
/* -------------------------------------------------------------------- */
/* Read in Field Definitions */
/* -------------------------------------------------------------------- */
pabyBuf = STATIC_CAST(unsigned char *, realloc(pabyBuf, nHeadLen));
psDBF->pszHeader = REINTERPRET_CAST(char *, pabyBuf);
psDBF->sHooks.FSeek(psDBF->fp, XBASE_FILEHDR_SZ, 0);
if (psDBF->sHooks.FRead(pabyBuf, nHeadLen - XBASE_FILEHDR_SZ, 1,
psDBF->fp) != 1)
{
psDBF->sHooks.FClose(psDBF->fp);
free(pabyBuf);
free(psDBF->pszCurrentRecord);
free(psDBF->pszCodePage);
free(psDBF);
return SHPLIB_NULLPTR;
}
psDBF->panFieldOffset = STATIC_CAST(int *, malloc(sizeof(int) * nFields));
psDBF->panFieldSize = STATIC_CAST(int *, malloc(sizeof(int) * nFields));
psDBF->panFieldDecimals = STATIC_CAST(int *, malloc(sizeof(int) * nFields));
psDBF->pachFieldType = STATIC_CAST(char *, malloc(sizeof(char) * nFields));
for (int iField = 0; iField < nFields; iField++)
{
const unsigned char *pabyFInfo = pabyBuf + iField * XBASE_FLDHDR_SZ;
if (pabyFInfo[0] == HEADER_RECORD_TERMINATOR)
{
psDBF->nFields = iField;
break;
}
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] = STATIC_CAST(char, pabyFInfo[11]);
if (iField == 0)
psDBF->panFieldOffset[iField] = 1;
else
psDBF->panFieldOffset[iField] = psDBF->panFieldOffset[iField - 1] +
psDBF->panFieldSize[iField - 1];
}
/* Check that the total width of fields does not exceed the record width */
if (psDBF->nFields > 0 && psDBF->panFieldOffset[psDBF->nFields - 1] +
psDBF->panFieldSize[psDBF->nFields - 1] >
psDBF->nRecordLength)
{
DBFClose(psDBF);
return SHPLIB_NULLPTR;
}
DBFSetWriteEndOfFileChar(psDBF, TRUE);
psDBF->bRequireNextWriteSeek = TRUE;
return (psDBF);
}
/************************************************************************/
/* DBFClose() */
/************************************************************************/
void SHPAPI_CALL DBFClose(DBFHandle psDBF)
{
if (psDBF == SHPLIB_NULLPTR)
return;
/* -------------------------------------------------------------------- */
/* Write out header if not already written. */
/* -------------------------------------------------------------------- */
if (psDBF->bNoHeader)
DBFWriteHeader(psDBF);
CPL_IGNORE_RET_VAL_INT(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 != SHPLIB_NULLPTR)
{
free(psDBF->panFieldOffset);
free(psDBF->panFieldSize);
free(psDBF->panFieldDecimals);
free(psDBF->pachFieldType);
}
if (psDBF->pszWorkField != SHPLIB_NULLPTR)
free(psDBF->pszWorkField);
free(psDBF->pszHeader);
free(psDBF->pszCurrentRecord);
free(psDBF->pszCodePage);
free(psDBF);
}
/************************************************************************/
/* DBFCreate() */
/* */
/* Create a new .dbf file with default code page LDID/87 (0x57) */
/************************************************************************/
DBFHandle SHPAPI_CALL DBFCreate(const char *pszFilename)
{
return DBFCreateEx(pszFilename, "LDID/87"); // 0x57
}
/************************************************************************/
/* DBFCreateEx() */
/* */
/* Create a new .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL DBFCreateEx(const char *pszFilename,
const char *pszCodePage)
{
SAHooks sHooks;
SASetupDefaultHooks(&sHooks);
return DBFCreateLL(pszFilename, pszCodePage, &sHooks);
}
/************************************************************************/
/* DBFCreate() */
/* */
/* Create a new .dbf file. */
/************************************************************************/
DBFHandle SHPAPI_CALL DBFCreateLL(const char *pszFilename,
const char *pszCodePage,
const SAHooks *psHooks)
{
/* -------------------------------------------------------------------- */
/* Compute the base (layer) name. If there is any extension */
/* on the passed in filename we will strip it off. */
/* -------------------------------------------------------------------- */
const int nLenWithoutExtension = DBFGetLenWithoutExtension(pszFilename);
char *pszFullname = STATIC_CAST(char *, malloc(nLenWithoutExtension + 5));
memcpy(pszFullname, pszFilename, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".dbf", 5);
/* -------------------------------------------------------------------- */
/* Create the file. */
/* -------------------------------------------------------------------- */
SAFile fp = psHooks->FOpen(pszFullname, "wb+", psHooks->pvUserData);
if (fp == SHPLIB_NULLPTR)
{
free(pszFullname);
return SHPLIB_NULLPTR;
}
memcpy(pszFullname + nLenWithoutExtension, ".cpg", 5);
int ldid = -1;
if (pszCodePage != SHPLIB_NULLPTR)
{
if (strncmp(pszCodePage, "LDID/", 5) == 0)
{
ldid = atoi(pszCodePage + 5);
if (ldid > 255)
ldid = -1; // don't use 0 to indicate out of range as LDID/0 is
// a valid one
}
if (ldid < 0)
{
SAFile fpCPG =
psHooks->FOpen(pszFullname, "w", psHooks->pvUserData);
psHooks->FWrite(
CONST_CAST(void *, STATIC_CAST(const void *, pszCodePage)),
strlen(pszCodePage), 1, fpCPG);
psHooks->FClose(fpCPG);
}
}
if (pszCodePage == SHPLIB_NULLPTR || ldid >= 0)
{
psHooks->Remove(pszFullname, psHooks->pvUserData);
}
free(pszFullname);
/* -------------------------------------------------------------------- */
/* Create the info structure. */
/* -------------------------------------------------------------------- */
DBFHandle psDBF = STATIC_CAST(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 =
XBASE_FILEHDR_SZ + 1; /* + 1 for HEADER_RECORD_TERMINATOR */
psDBF->panFieldOffset = SHPLIB_NULLPTR;
psDBF->panFieldSize = SHPLIB_NULLPTR;
psDBF->panFieldDecimals = SHPLIB_NULLPTR;
psDBF->pachFieldType = SHPLIB_NULLPTR;
psDBF->pszHeader = SHPLIB_NULLPTR;
psDBF->nCurrentRecord = -1;
psDBF->bCurrentRecordModified = FALSE;
psDBF->pszCurrentRecord = SHPLIB_NULLPTR;
psDBF->bNoHeader = TRUE;
psDBF->iLanguageDriver = ldid > 0 ? ldid : 0;
psDBF->pszCodePage = SHPLIB_NULLPTR;
if (pszCodePage)
{
psDBF->pszCodePage =
STATIC_CAST(char *, malloc(strlen(pszCodePage) + 1));
strcpy(psDBF->pszCodePage, pszCodePage);
}
DBFSetLastModifiedDate(psDBF, 95, 7, 26); /* dummy date */
DBFSetWriteEndOfFileChar(psDBF, TRUE);
psDBF->bRequireNextWriteSeek = TRUE;
return (psDBF);
}
/************************************************************************/
/* DBFAddField() */
/* */
/* Add a field to a newly created .dbf or to an existing one */
/************************************************************************/
int SHPAPI_CALL DBFAddField(DBFHandle psDBF, const char *pszFieldName,
DBFFieldType eType, int nWidth, int nDecimals)
{
char chNativeType;
if (eType == FTLogical)
chNativeType = 'L';
else if (eType == FTDate)
chNativeType = 'D';
else if (eType == FTString)
chNativeType = 'C';
else
chNativeType = 'N';
return DBFAddNativeFieldType(psDBF, pszFieldName, chNativeType, nWidth,
nDecimals);
}
/************************************************************************/
/* DBFGetNullCharacter() */
/************************************************************************/
static char DBFGetNullCharacter(char chType)
{
switch (chType)
{
case 'N':
case 'F':
return '*';
case 'D':
return '0';
case 'L':
return '?';
default:
return ' ';
}
}
/************************************************************************/
/* 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)
{
/* make sure that everything is written in .dbf */
if (!DBFFlushRecord(psDBF))
return -1;
if (psDBF->nHeaderLength + XBASE_FLDHDR_SZ > 65535)
{
char szMessage[128];
snprintf(szMessage, sizeof(szMessage),
"Cannot add field %s. Header length limit reached "
"(max 65535 bytes, 2046 fields).",
pszFieldName);
psDBF->sHooks.Error(szMessage);
return -1;
}
/* -------------------------------------------------------------------- */
/* Do some checking to ensure we can add records to this file. */
/* -------------------------------------------------------------------- */
if (nWidth < 1)
return -1;
if (nWidth > XBASE_FLD_MAX_WIDTH)
nWidth = XBASE_FLD_MAX_WIDTH;
if (psDBF->nRecordLength + nWidth > 65535)
{
char szMessage[128];
snprintf(szMessage, sizeof(szMessage),
"Cannot add field %s. Record length limit reached "
"(max 65535 bytes).",
pszFieldName);
psDBF->sHooks.Error(szMessage);
return -1;
}
const int nOldRecordLength = psDBF->nRecordLength;
const int nOldHeaderLength = psDBF->nHeaderLength;
/* -------------------------------------------------------------------- */
/* realloc all the arrays larger to hold the additional field */
/* information. */
/* -------------------------------------------------------------------- */
psDBF->nFields++;
psDBF->panFieldOffset = STATIC_CAST(
int *, realloc(psDBF->panFieldOffset, sizeof(int) * psDBF->nFields));
psDBF->panFieldSize = STATIC_CAST(
int *, realloc(psDBF->panFieldSize, sizeof(int) * psDBF->nFields));
psDBF->panFieldDecimals = STATIC_CAST(
int *, realloc(psDBF->panFieldDecimals, sizeof(int) * psDBF->nFields));
psDBF->pachFieldType = STATIC_CAST(
char *, realloc(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 += XBASE_FLDHDR_SZ;
psDBF->bUpdated = FALSE;
psDBF->pszHeader = STATIC_CAST(
char *, realloc(psDBF->pszHeader, psDBF->nFields * XBASE_FLDHDR_SZ));
char *pszFInfo = psDBF->pszHeader + XBASE_FLDHDR_SZ * (psDBF->nFields - 1);
for (int i = 0; i < XBASE_FLDHDR_SZ; i++)
pszFInfo[i] = '\0';
strncpy(pszFInfo, pszFieldName, XBASE_FLDNAME_LEN_WRITE);
pszFInfo[11] = psDBF->pachFieldType[psDBF->nFields - 1];
if (chType == 'C')
{
pszFInfo[16] = STATIC_CAST(unsigned char, nWidth % 256);
pszFInfo[17] = STATIC_CAST(unsigned char, nWidth / 256);
}
else
{
pszFInfo[16] = STATIC_CAST(unsigned char, nWidth);
pszFInfo[17] = STATIC_CAST(unsigned char, nDecimals);
}
/* -------------------------------------------------------------------- */
/* Make the current record buffer appropriately larger. */
/* -------------------------------------------------------------------- */
psDBF->pszCurrentRecord = STATIC_CAST(
char *, realloc(psDBF->pszCurrentRecord, psDBF->nRecordLength));
/* we're done if dealing with new .dbf */
if (psDBF->bNoHeader)
return (psDBF->nFields - 1);
/* -------------------------------------------------------------------- */
/* For existing .dbf file, shift records */
/* -------------------------------------------------------------------- */
/* alloc record */
char *pszRecord =
STATIC_CAST(char *, malloc(sizeof(char) * psDBF->nRecordLength));
const char chFieldFill = DBFGetNullCharacter(chType);
SAOffset nRecordOffset;
for (int i = psDBF->nRecords - 1; i >= 0; --i)
{
nRecordOffset =
nOldRecordLength * STATIC_CAST(SAOffset, i) + nOldHeaderLength;
/* load record */
psDBF->sHooks.FSeek(psDBF->fp, nRecordOffset, 0);
if (psDBF->sHooks.FRead(pszRecord, nOldRecordLength, 1, psDBF->fp) != 1)
{
free(pszRecord);
return -1;
}
/* set new field's value to NULL */
memset(pszRecord + nOldRecordLength, chFieldFill, nWidth);
nRecordOffset = psDBF->nRecordLength * STATIC_CAST(SAOffset, i) +
psDBF->nHeaderLength;
/* move record to the new place*/
psDBF->sHooks.FSeek(psDBF->fp, nRecordOffset, 0);
psDBF->sHooks.FWrite(pszRecord, psDBF->nRecordLength, 1, psDBF->fp);
}
if (psDBF->bWriteEndOfFileChar)
{
char ch = END_OF_FILE_CHARACTER;
nRecordOffset =
psDBF->nRecordLength * STATIC_CAST(SAOffset, psDBF->nRecords) +
psDBF->nHeaderLength;
psDBF->sHooks.FSeek(psDBF->fp, nRecordOffset, 0);
psDBF->sHooks.FWrite(&ch, 1, 1, psDBF->fp);
}
/* free record */
free(pszRecord);
/* force update of header with new header, record length and new field */
psDBF->bNoHeader = TRUE;
DBFUpdateHeader(psDBF);
psDBF->nCurrentRecord = -1;
psDBF->bCurrentRecordModified = FALSE;
psDBF->bUpdated = TRUE;
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)
{
/* -------------------------------------------------------------------- */
/* Verify selection. */
/* -------------------------------------------------------------------- */
if (hEntity < 0 || hEntity >= psDBF->nRecords)
return SHPLIB_NULLPTR;
if (iField < 0 || iField >= psDBF->nFields)
return SHPLIB_NULLPTR;
/* -------------------------------------------------------------------- */
/* Have we read the record? */
/* -------------------------------------------------------------------- */
if (!DBFLoadRecord(psDBF, hEntity))
return SHPLIB_NULLPTR;
const unsigned char *pabyRec =
REINTERPRET_CAST(const 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 == SHPLIB_NULLPTR)
psDBF->pszWorkField =
STATIC_CAST(char *, malloc(psDBF->nWorkFieldLength));
else
psDBF->pszWorkField = STATIC_CAST(
char *, realloc(psDBF->pszWorkField, psDBF->nWorkFieldLength));
}
/* -------------------------------------------------------------------- */
/* Extract the requested field. */
/* -------------------------------------------------------------------- */
memcpy(psDBF->pszWorkField,
REINTERPRET_CAST(const char *, pabyRec) +
psDBF->panFieldOffset[iField],
psDBF->panFieldSize[iField]);
psDBF->pszWorkField[psDBF->panFieldSize[iField]] = '\0';
void *pReturnField = psDBF->pszWorkField;
/* -------------------------------------------------------------------- */
/* Decode the field. */
/* -------------------------------------------------------------------- */
if (chReqType == 'I')
{
psDBF->fieldValue.nIntField = atoi(psDBF->pszWorkField);
pReturnField = &(psDBF->fieldValue.nIntField);
}
else if (chReqType == 'N')
{
psDBF->fieldValue.dfDoubleField =
psDBF->sHooks.Atof(psDBF->pszWorkField);
pReturnField = &(psDBF->fieldValue.dfDoubleField);
}
/* -------------------------------------------------------------------- */
/* Should we trim white space off the string attribute value? */