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<? |
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/* |
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* Phormation |
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* - A library of PHP code to make development of database-driven |
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* html forms easy and quick |
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* |
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* Copyright (C) 2000 Jason D. Hildebrand |
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* PeaceWorks Computer Consulting |
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* |
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* jason@peaceworks.ca |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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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, write to the Free Software |
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* Foundation, Inc., 59 Temple Street #330, Boston, MA 02111-1307, USA. |
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*/ |
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|
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|
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|
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// if "pg_process_hook" is specified as the process_hook parameter for a |
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// file upload widget, this function will be called when a new file is |
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// uploaded |
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|
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// processparm [in] - is a user-defined parameter which can be specified in the type array |
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// tmpfilename [in] - the temporary filepath/name of the uploaded file (stored on the server) |
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// filename [in] - the original name of the uploaded file |
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// targetdir [in] - the target directory |
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|
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// the function must return a unique filename (without path). Phormation will |
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// prepend the target directory to this filename and then move the uploaded |
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// file to this destination |
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|
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function default_image_process_hook( $processparm, $tmpfilename, $filename, $targetdir ) |
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{ |
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// first generate the unique filename |
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$filename = default_process_hook( $processparm, $tmpfilename, $filename, $targetdir ); |
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|
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// now try to figure out what kind of image was uploaded, so that we can |
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// add an extension to the filename |
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$ext = determine_image_type( $tmpfilename ); |
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$filename .= "." . $ext; |
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|
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return( $filename ); |
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} |
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|
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function default_process_hook( $processparm, $tmpfilename, $filename, $targetdir ) |
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{ |
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global $DB; |
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if( $DB == "mysql" ) { |
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$filename = mysql_process_hook( $processparm, $tmpfilename, $filename, $targetdir ); |
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} else if( $DB == "pgsql" ) { |
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$filename = pgsql_process_hook( $processparm, $tmpfilename, $filename, $targetdir ); |
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} else { |
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make_error( "DB type is not valid." ); |
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} |
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return( $filename ); |
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} |
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|
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function pgsql_process_hook( $processparm, $tmpfilename, $filename, $targetdir ) |
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{ |
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global $conn; // connection to a database |
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|
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// this hook expects the name of a database 'sequence' to be given in the |
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// $processparm parameter |
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|
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$query = "select nextval('$processparm')"; |
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$result = false; |
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for( $i = 0; !$result && $i < 5; $i++ ) { |
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$result = dbi_exec( $conn, $query ); |
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} |
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$array = dbi_fetch_array( $result, 0 ); |
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$num = $array[0]; |
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$filename = 'file' . $num; |
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return( $filename ); |
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} |
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|
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function mysql_process_hook( $processparm, $tmpfilename, $filename, $targetdir ) |
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{ |
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global $conn; // connection to a database |
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|
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// this hook expects the name of a database table to be given in the |
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// $processparm parameter, which will be used as a counter to generate |
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// unique filenames |
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|
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// lock the counter table |
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dbi_exec( $conn, "lock tables $processparm write" ); |
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|
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// get the value of the counter |
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$result = dbi_exec( $conn, "select num from $processparm where id='cntr'" ); |
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|
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if( dbi_numrows( $result ) == 0 ) { |
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// if the counter doesn't yet exist in the table, use the value 0 for |
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// this call, and insert 1 into the table (for the next time) |
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$num = 0; |
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$filename = 'file' . $num; |
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dbi_exec( $conn, "insert into $processparm (id,num) values ('cntr', 1 )" ); |
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} else { |
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// otherwise use the current value, and increment the value |
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$array = dbi_fetch_array( $result, 0 ); |
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$num = $array[0]; |
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$filename = 'file' . $num; |
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dbi_exec( $conn, "update $processparm set num = num + 1 where id='cntr'" ); |
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} |
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|
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// release all table locks |
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dbi_exec( $conn, "unlock tables" ); |
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return( $filename ); |
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} |
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|
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function determine_image_type( $filename ) |
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{ |
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// thanks to H. Peter Anvin <hpa@zytor.com> (author of magicfilter) for the magic! |
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$fd = fopen( $filename, "r" ); |
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if( $fd ) { |
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$string = fread( $fd, 20 ); |
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fclose( $fd ); |
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|
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$str2 = substr( $string, 6 ); |
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|
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if( strncmp( $string, "GIF89a", 6 ) == 0 || strncmp( $string, "GIF87a", 6 ) == 0 ) { |
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$ext = "gif"; |
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} else if( |
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( strncmp( $string, "\377\330\377\340", 4 ) == 0 && strncmp( $str2, "JFIF\0", 5 ) == 0 ) |
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|| ( strncmp( $string, "\377\330\377\341", 4 ) == 0 && strncmp( $str2, "Exif\0", 5 ) == 0 ) ) { |
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$ext = "jpg"; |
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} else if( strncmp( $string, "\x89PNG", 4 ) == 0 ) { |
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$ext = "png"; |
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} else if( strncmp( $string, "MM\0\x2a", 4 ) == 0 || strncmp( $string, "II\x2a\0", 4 ) == 0 ) { |
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$ext = "tiff"; |
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} |
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} |
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return( $ext ); |
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} |
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|
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|
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?> |
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