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shpopen.c
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/******************************************************************************
*
* Project: Shapelib
* Purpose: Implementation of core Shapefile read/write functions.
* Author: Frank Warmerdam, warmerdam@pobox.com
*
******************************************************************************
* Copyright (c) 1999, 2001, Frank Warmerdam
* Copyright (c) 2011-2024, Even Rouault <even dot rouault at spatialys.com>
*
* SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
******************************************************************************/
#include "shapefil_private.h"
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#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)
#ifndef snprintf
#define snprintf _snprintf
#endif
#endif
#endif
/* Allows customization of the message in vendored builds (such as GDAL) */
#ifndef SHP_RESTORE_SHX_HINT_MESSAGE
#define SHP_RESTORE_SHX_HINT_MESSAGE \
" Use SHPRestoreSHX() to restore or create it."
#endif
/************************************************************************/
/* 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. */
/* -------------------------------------------------------------------- */
unsigned char abyHeader[100] = {0};
abyHeader[2] = 0x27; /* magic cookie */
abyHeader[3] = 0x0a;
uint32_t i32 = psSHP->nFileSize / 2; /* file size */
ByteCopy(&i32, abyHeader + 24, 4);
#if !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(abyHeader + 24);
#endif
i32 = 1000; /* version */
ByteCopy(&i32, abyHeader + 28, 4);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP32(abyHeader + 28);
#endif
i32 = psSHP->nShapeType; /* shape type */
ByteCopy(&i32, abyHeader + 32, 4);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP32(abyHeader + 32);
#endif
double dValue = psSHP->adBoundsMin[0]; /* set bounds */
ByteCopy(&dValue, abyHeader + 36, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 36);
#endif
dValue = psSHP->adBoundsMin[1];
ByteCopy(&dValue, abyHeader + 44, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 44);
#endif
dValue = psSHP->adBoundsMax[0];
ByteCopy(&dValue, abyHeader + 52, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 52);
#endif
dValue = psSHP->adBoundsMax[1];
ByteCopy(&dValue, abyHeader + 60, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 60);
#endif
dValue = psSHP->adBoundsMin[2]; /* z */
ByteCopy(&dValue, abyHeader + 68, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 68);
#endif
dValue = psSHP->adBoundsMax[2];
ByteCopy(&dValue, abyHeader + 76, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 76);
#endif
dValue = psSHP->adBoundsMin[3]; /* m */
ByteCopy(&dValue, abyHeader + 84, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 84);
#endif
dValue = psSHP->adBoundsMax[3];
ByteCopy(&dValue, abyHeader + 92, 8);
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(abyHeader + 92);
#endif
/* -------------------------------------------------------------------- */
/* 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(uint32_t) + 100) / 2; /* file size */
ByteCopy(&i32, abyHeader + 24, 4);
#if !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(abyHeader + 24);
#endif
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. */
/* -------------------------------------------------------------------- */
uint32_t *panSHX =
STATIC_CAST(uint32_t *, malloc(sizeof(uint32_t) * 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 !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(panSHX + i * 2);
SHP_SWAP32(panSHX + i * 2 + 1);
#endif
}
if (STATIC_CAST(int, psSHP->sHooks.FWrite(panSHX, sizeof(uint32_t) * 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,
const 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";
}
/* -------------------------------------------------------------------- */
/* Initialize the info structure. */
/* -------------------------------------------------------------------- */
SHPHandle psSHP = STATIC_CAST(SHPHandle, calloc(1, sizeof(SHPInfo)));
if (!psSHP)
return SHPLIB_NULLPTR;
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));
if (!pszFullname)
{
free(psSHP);
return SHPLIB_NULLPTR;
}
memcpy(pszFullname, pszLayer, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".shp", 5);
psSHP->fpSHP =
psSHP->sHooks.FOpen(pszFullname, pszAccess, psSHP->sHooks.pvUserData);
if (psSHP->fpSHP == SHPLIB_NULLPTR)
{
memcpy(pszFullname + nLenWithoutExtension, ".SHP", 5);
psSHP->fpSHP = psSHP->sHooks.FOpen(pszFullname, pszAccess,
psSHP->sHooks.pvUserData);
}
if (psSHP->fpSHP == SHPLIB_NULLPTR)
{
const size_t nMessageLen = strlen(pszFullname) * 2 + 256;
char *pszMessage = STATIC_CAST(char *, malloc(nMessageLen));
if (pszMessage)
{
pszFullname[nLenWithoutExtension] = 0;
snprintf(pszMessage, nMessageLen,
"Unable to open %s.shp or %s.SHP in %s mode.", pszFullname,
pszFullname, pszAccess);
psHooks->Error(pszMessage);
free(pszMessage);
}
free(psSHP);
free(pszFullname);
return SHPLIB_NULLPTR;
}
memcpy(pszFullname + nLenWithoutExtension, ".shx", 5);
psSHP->fpSHX =
psSHP->sHooks.FOpen(pszFullname, pszAccess, psSHP->sHooks.pvUserData);
if (psSHP->fpSHX == SHPLIB_NULLPTR)
{
memcpy(pszFullname + nLenWithoutExtension, ".SHX", 5);
psSHP->fpSHX = psSHP->sHooks.FOpen(pszFullname, pszAccess,
psSHP->sHooks.pvUserData);
}
if (psSHP->fpSHX == SHPLIB_NULLPTR)
{
const size_t nMessageLen =
64 + strlen(pszFullname) * 2 + strlen(SHP_RESTORE_SHX_HINT_MESSAGE);
char *pszMessage = STATIC_CAST(char *, malloc(nMessageLen));
if (pszMessage)
{
pszFullname[nLenWithoutExtension] = 0;
snprintf(
pszMessage, nMessageLen,
"Unable to open %s.shx or %s.SHX." SHP_RESTORE_SHX_HINT_MESSAGE,
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. */
/* -------------------------------------------------------------------- */
unsigned char *pabyBuf = STATIC_CAST(unsigned char *, malloc(100));
if (!pabyBuf || 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 defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 36);
#endif
memcpy(&dValue, pabyBuf + 36, 8);
psSHP->adBoundsMin[0] = dValue;
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 44);
#endif
memcpy(&dValue, pabyBuf + 44, 8);
psSHP->adBoundsMin[1] = dValue;
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 52);
#endif
memcpy(&dValue, pabyBuf + 52, 8);
psSHP->adBoundsMax[0] = dValue;
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 60);
#endif
memcpy(&dValue, pabyBuf + 60, 8);
psSHP->adBoundsMax[1] = dValue;
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 68); /* z */
#endif
memcpy(&dValue, pabyBuf + 68, 8);
psSHP->adBoundsMin[2] = dValue;
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 76);
#endif
memcpy(&dValue, pabyBuf + 76, 8);
psSHP->adBoundsMax[2] = dValue;
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 84); /* z */
#endif
memcpy(&dValue, pabyBuf + 84, 8);
psSHP->adBoundsMin[3] = dValue;
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP64(pabyBuf + 92);
#endif
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(unsigned char *, 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 !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(&nOffset);
#endif
unsigned int nLength;
memcpy(&nLength, pabyBuf + i * 8 + 4, 4);
#if !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(&nLength);
#endif
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,
const 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,
const 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";
}
/* -------------------------------------------------------------------- */
/* 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));
if (!pszFullname)
return 0;
memcpy(pszFullname, pszLayer, nLenWithoutExtension);
memcpy(pszFullname + nLenWithoutExtension, ".shp", 5);
SAFile fpSHP = psHooks->FOpen(pszFullname, pszAccess, psHooks->pvUserData);
if (fpSHP == SHPLIB_NULLPTR)
{
memcpy(pszFullname + nLenWithoutExtension, ".SHP", 5);
fpSHP = psHooks->FOpen(pszFullname, pszAccess, psHooks->pvUserData);
}
if (fpSHP == SHPLIB_NULLPTR)
{
const size_t nMessageLen = strlen(pszFullname) * 2 + 256;
char *pszMessage = STATIC_CAST(char *, malloc(nMessageLen));
if (pszMessage)
{
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. */
/* -------------------------------------------------------------------- */
unsigned char *pabyBuf = STATIC_CAST(unsigned char *, 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, psHooks->pvUserData);
if (fpSHX == SHPLIB_NULLPTR)
{
size_t nMessageLen = strlen(pszFullname) * 2 + 256;
char *pszMessage = STATIC_CAST(char *, malloc(nMessageLen));
if (pszMessage)
{
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));
if (!pabySHXHeader)
{
psHooks->FClose(fpSHP);
free(pabyBuf);
free(pszFullname);
return (0);
}
memcpy(pabySHXHeader, pabyBuf, 100);
psHooks->FWrite(pabySHXHeader, 100, 1, fpSHX);
free(pabyBuf);
// unsigned int nCurrentRecordOffset = 0;
unsigned int nCurrentSHPOffset = 100;
unsigned int nRealSHXContentSize = 100;
int nRetCode = TRUE;
unsigned int nRecordOffset = 50;
while (nCurrentSHPOffset < nSHPFilesize)
{
unsigned int niRecord = 0;
unsigned int nRecordLength = 0;
int nSHPType;
if (psHooks->FRead(&niRecord, 4, 1, fpSHP) == 1 &&
psHooks->FRead(&nRecordLength, 4, 1, fpSHP) == 1 &&
psHooks->FRead(&nSHPType, 4, 1, fpSHP) == 1)
{
char abyReadRecord[8];
unsigned int nRecordOffsetBE = nRecordOffset;
#if !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(&nRecordOffsetBE);
#endif
memcpy(abyReadRecord, &nRecordOffsetBE, 4);
memcpy(abyReadRecord + 4, &nRecordLength, 4);
#if !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(&nRecordLength);
#endif
#if defined(SHP_BIG_ENDIAN)
SHP_SWAP32(&nSHPType);
#endif
// Sanity check on record length
if (nRecordLength < 1 ||
nRecordLength > (nSHPFilesize - (nCurrentSHPOffset + 8)) / 2)
{
char szErrorMsg[200];
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Error parsing .shp to restore .shx. "
"Invalid record length = %u at record starting at "
"offset %u",
nRecordLength, nCurrentSHPOffset);
psHooks->Error(szErrorMsg);
nRetCode = FALSE;
break;
}
// Sanity check on record type
if (nSHPType != SHPT_NULL && nSHPType != SHPT_POINT &&
nSHPType != SHPT_ARC && nSHPType != SHPT_POLYGON &&
nSHPType != SHPT_MULTIPOINT && nSHPType != SHPT_POINTZ &&
nSHPType != SHPT_ARCZ && nSHPType != SHPT_POLYGONZ &&
nSHPType != SHPT_MULTIPOINTZ && nSHPType != SHPT_POINTM &&
nSHPType != SHPT_ARCM && nSHPType != SHPT_POLYGONM &&
nSHPType != SHPT_MULTIPOINTM && nSHPType != SHPT_MULTIPATCH)
{
char szErrorMsg[200];
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Error parsing .shp to restore .shx. "
"Invalid shape type = %d at record starting at "
"offset %u",
nSHPType, nCurrentSHPOffset);
psHooks->Error(szErrorMsg);
nRetCode = FALSE;
break;
}
psHooks->FWrite(abyReadRecord, 8, 1, fpSHX);
nRecordOffset += nRecordLength + 4;
// nCurrentRecordOffset += 8;
nCurrentSHPOffset += 8 + nRecordLength * 2;
psHooks->FSeek(fpSHP, nCurrentSHPOffset, 0);
nRealSHXContentSize += 8;
}
else
{
char szErrorMsg[200];
snprintf(szErrorMsg, sizeof(szErrorMsg),
"Error parsing .shp to restore .shx. "
"Cannot read first bytes of record starting at "
"offset %u",
nCurrentSHPOffset);
psHooks->Error(szErrorMsg);
nRetCode = FALSE;
break;
}
}
if (nRetCode && nCurrentSHPOffset != nSHPFilesize)
{
psHooks->Error("Error parsing .shp to restore .shx. "
"Not expected number of bytes");
nRetCode = FALSE;
}
nRealSHXContentSize /= 2; // Bytes counted -> WORDs
#if !defined(SHP_BIG_ENDIAN)
SHP_SWAP32(&nRealSHXContentSize);
#endif
psHooks->FSeek(fpSHX, 24, 0);
psHooks->FWrite(&nRealSHXContentSize, 4, 1, fpSHX);
psHooks->FClose(fpSHP);
psHooks->FClose(fpSHX);
free(pszFullname);
free(pabySHXHeader);
return nRetCode;
}
/************************************************************************/
/* 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(const 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);
}