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682 lines
22 KiB
PHP
682 lines
22 KiB
PHP
<?php
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/**
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* BytesFall ShapeFiles library
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*
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* The library implements the 2D variants of the ShapeFile format as defined in
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* http://www.esri.com/library/whitepapers/pdfs/shapefile.pdf.
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* The library currently supports reading and editing of ShapeFiles and the
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* Associated information (DBF file).
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*
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* @package bfShapeFiles
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* @version 0.0.2
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* @link http://bfshapefiles.sourceforge.net/
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* @license http://www.gnu.org/licenses/gpl-2.0.html GPLv2-or-later
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*
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* Copyright 2006-2007 Ovidio <ovidio AT users.sourceforge.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, you can download one from
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* http://www.gnu.org/copyleft/gpl.html.
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*
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*/
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function loadData($type, $data) {
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if (!$data) return $data;
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$tmp = unpack($type, $data);
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return current($tmp);
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}
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function swap($binValue) {
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$result = $binValue{strlen($binValue) - 1};
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for($i = strlen($binValue) - 2; $i >= 0 ; $i--) {
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$result .= $binValue{$i};
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}
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return $result;
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}
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function packDouble($value, $mode = 'LE') {
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$value = (double)$value;
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$bin = pack("d", $value);
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//We test if the conversion of an integer (1) is done as LE or BE by default
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switch (pack ('L', 1)) {
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case pack ('V', 1): //Little Endian
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$result = ($mode == 'LE') ? $bin : swap($bin);
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break;
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case pack ('N', 1): //Big Endian
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$result = ($mode == 'BE') ? $bin : swap($bin);
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break;
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default: //Some other thing, we just return false
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$result = FALSE;
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}
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return $result;
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}
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/**
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* ShapeFile class
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*
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* @package bfShapeFiles
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*/
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class ShapeFile {
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var $FileName;
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var $SHPFile;
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var $SHXFile;
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var $DBFFile;
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var $DBFHeader;
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var $lastError = "";
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var $boundingBox = array("xmin" => 0.0, "ymin" => 0.0, "xmax" => 0.0, "ymax" => 0.0);
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var $fileLength = 0;
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var $shapeType = 0;
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var $records;
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function ShapeFile($shapeType, $boundingBox = array("xmin" => 0.0, "ymin" => 0.0, "xmax" => 0.0, "ymax" => 0.0), $FileName = NULL) {
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$this->shapeType = $shapeType;
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$this->boundingBox = $boundingBox;
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$this->FileName = $FileName;
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$this->fileLength = 50;
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}
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function loadFromFile($FileName) {
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$this->FileName = $FileName;
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if (($this->_openSHPFile()) && ($this->_openDBFFile())) {
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$this->_loadHeaders();
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$this->_loadRecords();
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$this->_closeSHPFile();
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$this->_closeDBFFile();
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} else {
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return false;
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}
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}
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function saveToFile($FileName = NULL) {
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if ($FileName != NULL) $this->FileName = $FileName;
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if (($this->_openSHPFile(TRUE)) && ($this->_openSHXFile(TRUE)) && ($this->_openDBFFile(TRUE))) {
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$this->_saveHeaders();
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$this->_saveRecords();
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$this->_closeSHPFile();
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$this->_closeSHXFile();
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$this->_closeDBFFile();
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} else {
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return false;
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}
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}
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function addRecord($record) {
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if ((isset($this->DBFHeader)) && (is_array($this->DBFHeader))) {
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$record->updateDBFInfo($this->DBFHeader);
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}
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$this->fileLength += ($record->getContentLength() + 4);
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$this->records[] = $record;
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$this->records[count($this->records) - 1]->recordNumber = count($this->records);
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return (count($this->records) - 1);
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}
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function deleteRecord($index) {
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if (isset($this->records[$index])) {
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$this->fileLength -= ($this->records[$index]->getContentLength() + 4);
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for ($i = $index; $i < (count($this->records) - 1); $i++) {
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$this->records[$i] = $this->records[$i + 1];
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}
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unset($this->records[count($this->records) - 1]);
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$this->_deleteRecordFromDBF($index);
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}
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}
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function getDBFHeader() {
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return $this->DBFHeader;
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}
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function setDBFHeader($header) {
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$this->DBFHeader = $header;
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for ($i = 0; $i < count($this->records); $i++) {
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$this->records[$i]->updateDBFInfo($header);
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}
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}
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function getIndexFromDBFData($field, $value) {
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$result = -1;
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for ($i = 0; $i < (count($this->records) - 1); $i++) {
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if (isset($this->records[$i]->DBFData[$field]) && (strtoupper($this->records[$i]->DBFData[$field]) == strtoupper($value))) {
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$result = $i;
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}
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}
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return $result;
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}
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function _loadDBFHeader() {
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$DBFFile = fopen(str_replace('.*', '.dbf', $this->FileName), 'r');
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$result = array();
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$buff32 = array();
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$i = 1;
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$inHeader = true;
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while ($inHeader) {
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if (!feof($DBFFile)) {
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$buff32 = fread($DBFFile, 32);
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if ($i > 1) {
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if (substr($buff32, 0, 1) == chr(13)) {
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$inHeader = false;
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} else {
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$pos = strpos(substr($buff32, 0, 10), chr(0));
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$pos = ($pos == 0 ? 10 : $pos);
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$fieldName = substr($buff32, 0, $pos);
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$fieldType = substr($buff32, 11, 1);
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$fieldLen = ord(substr($buff32, 16, 1));
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$fieldDec = ord(substr($buff32, 17, 1));
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array_push($result, array($fieldName, $fieldType, $fieldLen, $fieldDec));
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}
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}
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$i++;
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} else {
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$inHeader = false;
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}
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}
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fclose($DBFFile);
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return($result);
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}
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function _deleteRecordFromDBF($index) {
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if (@dbase_delete_record($this->DBFFile, $index)) {
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@dbase_pack($this->DBFFile);
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}
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}
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function _loadHeaders() {
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fseek($this->SHPFile, 24, SEEK_SET);
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$this->fileLength = loadData("N", fread($this->SHPFile, 4));
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fseek($this->SHPFile, 32, SEEK_SET);
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$this->shapeType = loadData("V", fread($this->SHPFile, 4));
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$this->boundingBox = array();
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$this->boundingBox["xmin"] = loadData("d", fread($this->SHPFile, 8));
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$this->boundingBox["ymin"] = loadData("d", fread($this->SHPFile, 8));
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$this->boundingBox["xmax"] = loadData("d", fread($this->SHPFile, 8));
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$this->boundingBox["ymax"] = loadData("d", fread($this->SHPFile, 8));
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$this->DBFHeader = $this->_loadDBFHeader();
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}
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function _saveHeaders() {
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fwrite($this->SHPFile, pack("NNNNNN", 9994, 0, 0, 0, 0, 0));
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fwrite($this->SHPFile, pack("N", $this->fileLength));
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fwrite($this->SHPFile, pack("V", 1000));
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fwrite($this->SHPFile, pack("V", $this->shapeType));
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fwrite($this->SHPFile, packDouble($this->boundingBox['xmin']));
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fwrite($this->SHPFile, packDouble($this->boundingBox['ymin']));
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fwrite($this->SHPFile, packDouble($this->boundingBox['xmax']));
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fwrite($this->SHPFile, packDouble($this->boundingBox['ymax']));
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fwrite($this->SHPFile, pack("dddd", 0, 0, 0, 0));
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fwrite($this->SHXFile, pack("NNNNNN", 9994, 0, 0, 0, 0, 0));
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fwrite($this->SHXFile, pack("N", 50 + 4*count($this->records)));
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fwrite($this->SHXFile, pack("V", 1000));
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fwrite($this->SHXFile, pack("V", $this->shapeType));
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fwrite($this->SHXFile, packDouble($this->boundingBox['xmin']));
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fwrite($this->SHXFile, packDouble($this->boundingBox['ymin']));
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fwrite($this->SHXFile, packDouble($this->boundingBox['xmax']));
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fwrite($this->SHXFile, packDouble($this->boundingBox['ymax']));
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fwrite($this->SHXFile, pack("dddd", 0, 0, 0, 0));
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}
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function _loadRecords() {
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fseek($this->SHPFile, 100);
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while (!feof($this->SHPFile)) {
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$bByte = ftell($this->SHPFile);
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$record = new ShapeRecord(-1);
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$record->loadFromFile($this->SHPFile, $this->DBFFile);
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$eByte = ftell($this->SHPFile);
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if (($eByte <= $bByte) || ($record->lastError != "")) {
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return false;
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}
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$this->records[] = $record;
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}
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}
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function _saveRecords() {
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if (file_exists(str_replace('.*', '.dbf', $this->FileName))) {
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@unlink(str_replace('.*', '.dbf', $this->FileName));
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}
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if (!($this->DBFFile = @dbase_create(str_replace('.*', '.dbf', $this->FileName), $this->DBFHeader))) {
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return $this->setError(sprintf("It wasn't possible to create the DBase file '%s'", str_replace('.*', '.dbf', $this->FileName)));
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}
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$offset = 50;
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if (is_array($this->records) && (count($this->records) > 0)) {
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reset($this->records);
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while (list($index, $record) = each($this->records)) {
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//Save the record to the .shp file
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$record->saveToFile($this->SHPFile, $this->DBFFile, $index + 1);
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//Save the record to the .shx file
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fwrite($this->SHXFile, pack("N", $offset));
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fwrite($this->SHXFile, pack("N", $record->getContentLength()));
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$offset += (4 + $record->getContentLength());
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}
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}
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@dbase_pack($this->DBFFile);
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}
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function _openSHPFile($toWrite = false) {
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$this->SHPFile = @fopen(str_replace('.*', '.shp', $this->FileName), ($toWrite ? "wb+" : "rb"));
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if (!$this->SHPFile) {
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return $this->setError(sprintf("It wasn't possible to open the Shape file '%s'", str_replace('.*', '.shp', $this->FileName)));
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}
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return TRUE;
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}
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function _closeSHPFile() {
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if ($this->SHPFile) {
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fclose($this->SHPFile);
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$this->SHPFile = NULL;
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}
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}
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function _openSHXFile($toWrite = false) {
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$this->SHXFile = @fopen(str_replace('.*', '.shx', $this->FileName), ($toWrite ? "wb+" : "rb"));
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if (!$this->SHXFile) {
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return $this->setError(sprintf("It wasn't possible to open the Index file '%s'", str_replace('.*', '.shx', $this->FileName)));
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}
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return TRUE;
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}
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function _closeSHXFile() {
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if ($this->SHXFile) {
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fclose($this->SHXFile);
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$this->SHXFile = NULL;
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}
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}
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function _openDBFFile($toWrite = false) {
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$checkFunction = $toWrite ? "is_writable" : "is_readable";
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if (($toWrite) && (!file_exists(str_replace('.*', '.dbf', $this->FileName)))) {
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if (!@dbase_create(str_replace('.*', '.dbf', $this->FileName), $this->DBFHeader)) {
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return $this->setError(sprintf("It wasn't possible to create the DBase file '%s'", str_replace('.*', '.dbf', $this->FileName)));
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}
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}
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if ($checkFunction(str_replace('.*', '.dbf', $this->FileName))) {
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$this->DBFFile = dbase_open(str_replace('.*', '.dbf', $this->FileName), ($toWrite ? 2 : 0));
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if (!$this->DBFFile) {
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return $this->setError(sprintf("It wasn't possible to open the DBase file '%s'", str_replace('.*', '.dbf', $this->FileName)));
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}
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} else {
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return $this->setError(sprintf("It wasn't possible to find the DBase file '%s'", str_replace('.*', '.dbf', $this->FileName)));
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}
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return TRUE;
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}
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function _closeDBFFile() {
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if ($this->DBFFile) {
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dbase_close($this->DBFFile);
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$this->DBFFile = NULL;
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}
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}
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function setError($error) {
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$this->lastError = $error;
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return false;
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}
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}
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class ShapeRecord {
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var $SHPFile = NULL;
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var $DBFFile = NULL;
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var $recordNumber = NULL;
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var $shapeType = NULL;
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var $lastError = "";
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var $SHPData = array();
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var $DBFData = array();
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function ShapeRecord($shapeType) {
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$this->shapeType = $shapeType;
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}
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function loadFromFile(&$SHPFile, &$DBFFile) {
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$this->SHPFile = $SHPFile;
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$this->DBFFile = $DBFFile;
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$this->_loadHeaders();
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switch ($this->shapeType) {
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case 0:
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$this->_loadNullRecord();
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break;
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case 1:
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$this->_loadPointRecord();
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break;
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case 3:
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$this->_loadPolyLineRecord();
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break;
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case 5:
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$this->_loadPolygonRecord();
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break;
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case 8:
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$this->_loadMultiPointRecord();
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break;
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default:
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$this->setError(sprintf("The Shape Type '%s' is not supported.", $this->shapeType));
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break;
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}
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$this->_loadDBFData();
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}
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function saveToFile(&$SHPFile, &$DBFFile, $recordNumber) {
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$this->SHPFile = $SHPFile;
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$this->DBFFile = $DBFFile;
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$this->recordNumber = $recordNumber;
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$this->_saveHeaders();
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switch ($this->shapeType) {
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case 0:
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$this->_saveNullRecord();
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break;
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case 1:
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$this->_savePointRecord();
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break;
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case 3:
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$this->_savePolyLineRecord();
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break;
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case 5:
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$this->_savePolygonRecord();
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break;
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case 8:
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$this->_saveMultiPointRecord();
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break;
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default:
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$this->setError(sprintf("The Shape Type '%s' is not supported.", $this->shapeType));
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break;
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}
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$this->_saveDBFData();
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}
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function updateDBFInfo($header) {
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$tmp = $this->DBFData;
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unset($this->DBFData);
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$this->DBFData = array();
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reset($header);
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while (list($key, $value) = each($header)) {
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$this->DBFData[$value[0]] = (isset($tmp[$value[0]])) ? $tmp[$value[0]] : "";
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}
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}
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function _loadHeaders() {
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$this->recordNumber = loadData("N", fread($this->SHPFile, 4));
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$tmp = loadData("N", fread($this->SHPFile, 4)); //We read the length of the record
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$this->shapeType = loadData("V", fread($this->SHPFile, 4));
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}
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function _saveHeaders() {
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fwrite($this->SHPFile, pack("N", $this->recordNumber));
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fwrite($this->SHPFile, pack("N", $this->getContentLength()));
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fwrite($this->SHPFile, pack("V", $this->shapeType));
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}
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function _loadPoint() {
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$data = array();
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$data["x"] = loadData("d", fread($this->SHPFile, 8));
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$data["y"] = loadData("d", fread($this->SHPFile, 8));
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return $data;
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}
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function _savePoint($data) {
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fwrite($this->SHPFile, packDouble($data["x"]));
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fwrite($this->SHPFile, packDouble($data["y"]));
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}
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function _loadNullRecord() {
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$this->SHPData = array();
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}
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function _saveNullRecord() {
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//Don't save anything
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}
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function _loadPointRecord() {
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$this->SHPData = $this->_loadPoint();
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}
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function _savePointRecord() {
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$this->_savePoint($this->SHPData);
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}
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function _loadMultiPointRecord() {
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$this->SHPData = array();
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$this->SHPData["xmin"] = loadData("d", fread($this->SHPFile, 8));
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$this->SHPData["ymin"] = loadData("d", fread($this->SHPFile, 8));
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$this->SHPData["xmax"] = loadData("d", fread($this->SHPFile, 8));
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$this->SHPData["ymax"] = loadData("d", fread($this->SHPFile, 8));
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$this->SHPData["numpoints"] = loadData("V", fread($this->SHPFile, 4));
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for ($i = 0; $i <= $this->SHPData["numpoints"]; $i++) {
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$this->SHPData["points"][] = $this->_loadPoint();
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}
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}
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function _saveMultiPointRecord() {
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fwrite($this->SHPFile, pack("dddd", $this->SHPData["xmin"], $this->SHPData["ymin"], $this->SHPData["xmax"], $this->SHPData["ymax"]));
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fwrite($this->SHPFile, pack("V", $this->SHPData["numpoints"]));
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for ($i = 0; $i <= $this->SHPData["numpoints"]; $i++) {
|
|
$this->_savePoint($this->SHPData["points"][$i]);
|
|
}
|
|
}
|
|
|
|
function _loadPolyLineRecord() {
|
|
$this->SHPData = array();
|
|
$this->SHPData["xmin"] = loadData("d", fread($this->SHPFile, 8));
|
|
$this->SHPData["ymin"] = loadData("d", fread($this->SHPFile, 8));
|
|
$this->SHPData["xmax"] = loadData("d", fread($this->SHPFile, 8));
|
|
$this->SHPData["ymax"] = loadData("d", fread($this->SHPFile, 8));
|
|
|
|
$this->SHPData["numparts"] = loadData("V", fread($this->SHPFile, 4));
|
|
$this->SHPData["numpoints"] = loadData("V", fread($this->SHPFile, 4));
|
|
|
|
for ($i = 0; $i < $this->SHPData["numparts"]; $i++) {
|
|
$this->SHPData["parts"][$i] = loadData("V", fread($this->SHPFile, 4));
|
|
}
|
|
|
|
$firstIndex = ftell($this->SHPFile);
|
|
$readPoints = 0;
|
|
reset($this->SHPData["parts"]);
|
|
while (list($partIndex, $partData) = each($this->SHPData["parts"])) {
|
|
if (!isset($this->SHPData["parts"][$partIndex]["points"]) || !is_array($this->SHPData["parts"][$partIndex]["points"])) {
|
|
$this->SHPData["parts"][$partIndex] = array();
|
|
$this->SHPData["parts"][$partIndex]["points"] = array();
|
|
}
|
|
while (!in_array($readPoints, $this->SHPData["parts"]) && ($readPoints < ($this->SHPData["numpoints"])) && !feof($this->SHPFile)) {
|
|
$this->SHPData["parts"][$partIndex]["points"][] = $this->_loadPoint();
|
|
$readPoints++;
|
|
}
|
|
}
|
|
|
|
fseek($this->SHPFile, $firstIndex + ($readPoints*16));
|
|
}
|
|
|
|
function _savePolyLineRecord() {
|
|
fwrite($this->SHPFile, pack("dddd", $this->SHPData["xmin"], $this->SHPData["ymin"], $this->SHPData["xmax"], $this->SHPData["ymax"]));
|
|
|
|
fwrite($this->SHPFile, pack("VV", $this->SHPData["numparts"], $this->SHPData["numpoints"]));
|
|
|
|
for ($i = 0; $i < $this->SHPData["numparts"]; $i++) {
|
|
fwrite($this->SHPFile, pack("V", count($this->SHPData["parts"][$i])));
|
|
}
|
|
|
|
reset($this->SHPData["parts"]);
|
|
foreach ($this->SHPData["parts"] as $partData){
|
|
reset($partData["points"]);
|
|
while (list($pointIndex, $pointData) = each($partData["points"])) {
|
|
$this->_savePoint($pointData);
|
|
}
|
|
}
|
|
}
|
|
|
|
function _loadPolygonRecord() {
|
|
$this->_loadPolyLineRecord();
|
|
}
|
|
|
|
function _savePolygonRecord() {
|
|
$this->_savePolyLineRecord();
|
|
}
|
|
|
|
function addPoint($point, $partIndex = 0) {
|
|
switch ($this->shapeType) {
|
|
case 0:
|
|
//Don't add anything
|
|
break;
|
|
case 1:
|
|
//Substitutes the value of the current point
|
|
$this->SHPData = $point;
|
|
break;
|
|
case 3:
|
|
case 5:
|
|
//Adds a new point to the selected part
|
|
if (!isset($this->SHPData["xmin"]) || ($this->SHPData["xmin"] > $point["x"])) $this->SHPData["xmin"] = $point["x"];
|
|
if (!isset($this->SHPData["ymin"]) || ($this->SHPData["ymin"] > $point["y"])) $this->SHPData["ymin"] = $point["y"];
|
|
if (!isset($this->SHPData["xmax"]) || ($this->SHPData["xmax"] < $point["x"])) $this->SHPData["xmax"] = $point["x"];
|
|
if (!isset($this->SHPData["ymax"]) || ($this->SHPData["ymax"] < $point["y"])) $this->SHPData["ymax"] = $point["y"];
|
|
|
|
$this->SHPData["parts"][$partIndex]["points"][] = $point;
|
|
|
|
$this->SHPData["numparts"] = count($this->SHPData["parts"]);
|
|
$this->SHPData["numpoints"]++;
|
|
break;
|
|
case 8:
|
|
//Adds a new point
|
|
if (!isset($this->SHPData["xmin"]) || ($this->SHPData["xmin"] > $point["x"])) $this->SHPData["xmin"] = $point["x"];
|
|
if (!isset($this->SHPData["ymin"]) || ($this->SHPData["ymin"] > $point["y"])) $this->SHPData["ymin"] = $point["y"];
|
|
if (!isset($this->SHPData["xmax"]) || ($this->SHPData["xmax"] < $point["x"])) $this->SHPData["xmax"] = $point["x"];
|
|
if (!isset($this->SHPData["ymax"]) || ($this->SHPData["ymax"] < $point["y"])) $this->SHPData["ymax"] = $point["y"];
|
|
|
|
$this->SHPData["points"][] = $point;
|
|
$this->SHPData["numpoints"]++;
|
|
break;
|
|
default:
|
|
$this->setError(sprintf("The Shape Type '%s' is not supported.", $this->shapeType));
|
|
break;
|
|
}
|
|
}
|
|
|
|
function deletePoint($pointIndex = 0, $partIndex = 0) {
|
|
switch ($this->shapeType) {
|
|
case 0:
|
|
//Don't delete anything
|
|
break;
|
|
case 1:
|
|
//Sets the value of the point to zero
|
|
$this->SHPData["x"] = 0.0;
|
|
$this->SHPData["y"] = 0.0;
|
|
break;
|
|
case 3:
|
|
case 5:
|
|
//Deletes the point from the selected part, if exists
|
|
if (isset($this->SHPData["parts"][$partIndex]) && isset($this->SHPData["parts"][$partIndex]["points"][$pointIndex])) {
|
|
for ($i = $pointIndex; $i < (count($this->SHPData["parts"][$partIndex]["points"]) - 1); $i++) {
|
|
$this->SHPData["parts"][$partIndex]["points"][$i] = $this->SHPData["parts"][$partIndex]["points"][$i + 1];
|
|
}
|
|
unset($this->SHPData["parts"][$partIndex]["points"][count($this->SHPData["parts"][$partIndex]["points"]) - 1]);
|
|
|
|
$this->SHPData["numparts"] = count($this->SHPData["parts"]);
|
|
$this->SHPData["numpoints"]--;
|
|
}
|
|
break;
|
|
case 8:
|
|
//Deletes the point, if exists
|
|
if (isset($this->SHPData["points"][$pointIndex])) {
|
|
for ($i = $pointIndex; $i < (count($this->SHPData["points"]) - 1); $i++) {
|
|
$this->SHPData["points"][$i] = $this->SHPData["points"][$i + 1];
|
|
}
|
|
unset($this->SHPData["points"][count($this->SHPData["points"]) - 1]);
|
|
|
|
$this->SHPData["numpoints"]--;
|
|
}
|
|
break;
|
|
default:
|
|
$this->setError(sprintf("The Shape Type '%s' is not supported.", $this->shapeType));
|
|
break;
|
|
}
|
|
}
|
|
|
|
function getContentLength() {
|
|
switch ($this->shapeType) {
|
|
case 0:
|
|
$result = 0;
|
|
break;
|
|
case 1:
|
|
$result = 10;
|
|
break;
|
|
case 3:
|
|
case 5:
|
|
$result = 22 + 2*count($this->SHPData["parts"]);
|
|
for ($i = 0; $i < count($this->SHPData["parts"]); $i++) {
|
|
$result += 8*count($this->SHPData["parts"][$i]["points"]);
|
|
}
|
|
break;
|
|
case 8:
|
|
$result = 20 + 8*count($this->SHPData["points"]);
|
|
break;
|
|
default:
|
|
$result = false;
|
|
$this->setError(sprintf("The Shape Type '%s' is not supported.", $this->shapeType));
|
|
break;
|
|
}
|
|
return $result;
|
|
}
|
|
|
|
function _loadDBFData() {
|
|
$this->DBFData = @dbase_get_record_with_names($this->DBFFile, $this->recordNumber);
|
|
unset($this->DBFData["deleted"]);
|
|
}
|
|
|
|
function _saveDBFData() {
|
|
unset($this->DBFData["deleted"]);
|
|
if ($this->recordNumber <= dbase_numrecords($this->DBFFile)) {
|
|
if (!dbase_replace_record($this->DBFFile, array_values($this->DBFData), $this->recordNumber)) {
|
|
$this->setError("I wasn't possible to update the information in the DBF file.");
|
|
}
|
|
} else {
|
|
if (!dbase_add_record($this->DBFFile, array_values($this->DBFData))) {
|
|
$this->setError("I wasn't possible to add the information to the DBF file.");
|
|
}
|
|
}
|
|
}
|
|
|
|
function setError($error) {
|
|
$this->lastError = $error;
|
|
return false;
|
|
}
|
|
}
|
|
|
|
?>
|