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Diffstat (limited to 'includes/jpeg_metadata_tk/pjmt_utils.php')
| -rw-r--r-- | includes/jpeg_metadata_tk/pjmt_utils.php | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/includes/jpeg_metadata_tk/pjmt_utils.php b/includes/jpeg_metadata_tk/pjmt_utils.php new file mode 100644 index 0000000..07579b3 --- /dev/null +++ b/includes/jpeg_metadata_tk/pjmt_utils.php @@ -0,0 +1,150 @@ +<?php +/****************************************************************************** +* +* Filename: pjmt_utils.php +* +* Description: Provides various utility functions for the toolkit +* +* Author: Evan Hunter +* +* Date: 20/1/2005 +* +* Project: JPEG Metadata +* +* Revision: 1.11 +* +* NOTE: This file will change with every revision update, hence will not +* be shown in the changes list +* +* URL: http://electronics.ozhiker.com +* +* Copyright: Copyright Evan Hunter 2004 +* +* License: This file is part of the PHP JPEG Metadata Toolkit. +* +* The PHP JPEG Metadata Toolkit is free software; you can +* redistribute it and/or modify it under the terms of the +* GNU General Public License as published by the Free Software +* Foundation; either version 2 of the License, or (at your +* option) any later version. +* +* The PHP JPEG Metadata Toolkit is distributed in the hope +* that it will be useful, but WITHOUT ANY WARRANTY; without +* even the implied warranty of MERCHANTABILITY or FITNESS +* FOR A PARTICULAR PURPOSE. See the GNU General Public License +* for more details. +* +* You should have received a copy of the GNU General Public +* License along with the PHP JPEG Metadata Toolkit; if not, +* write to the Free Software Foundation, Inc., 59 Temple +* Place, Suite 330, Boston, MA 02111-1307 USA +* +* If you require a different license for commercial or other +* purposes, please contact the author: evan@ozhiker.com +* +******************************************************************************/ + + +/****************************************************************************** +* +* Function: get_relative_path +* +* Description: Creates a relative path version of a file or directiroy name, +* given a directory that it will be relative to. +* +* Parameters: target - a file or directory name which will be made relative +* fromdir - the directory which the returned path is relative to +* +* Returns: output - the relative path +* +******************************************************************************/ + +function get_relative_path( $target, $fromdir ) +{ + // Check that the fromdir has a trailing slash, otherwise realpath will + // strip the last directory name off + if ( ( $fromdir[ strlen( $fromdir ) - 1 ] != "\\" ) && + ( $fromdir[ strlen( $fromdir ) - 1 ] != "/" ) ) + { + $fromdir .= "/"; + } + + // get a real directory name for each of the target and from directory + $from = realpath( $fromdir ); + $target = realpath( $target ); + $to = dirname( $target ); + + // Can't get relative path with drive in path - remove it + if ( ( $colonpos = strpos( $target, ":" ) ) != FALSE ) + { + $target = substr( $target, $colonpos+1 ); + } + if ( ( $colonpos = strpos( $from, ":" ) ) != FALSE ) + { + $from = substr( $from, $colonpos+1 ); + } + if ( ( $colonpos = strpos( $to, ":" ) ) != FALSE ) + { + $to = substr( $to, $colonpos+1 ); + } + + + $path = "../"; + $posval = 0; + // Step through the paths until a difference is found (ignore slash, backslash differences + // or the end of one is found + while ( ( ( $from[$posval] == $to[$posval] ) || + ( ( $from[$posval] == "\\" ) && ( $to[$posval] == "/" ) ) || + ( ( $from[$posval] == "/" ) && ( $to[$posval] == "\\" ) ) ) && + ( $from[$posval] && $to[$posval] ) ) + { + $posval++; + } + // Save the position of the first difference + $diffpos = $posval; + + // Check if the directories are the same or + // the if target is in a subdirectory of the fromdir + if ( ( ! $from[$posval] ) && + ( $to[$posval] == "/" || $to[$posval] == "\\" || !$to[$posval] ) ) + { + // target is in fromdir or a subdirectory + // Build relative path starting with a ./ + return ( "./" . substr( $target, $posval+1, strlen( $target ) ) ); + } + else + { + // target is outside the fromdir branch + // find out how many "../"'s are necessary + // Step through the fromdir path, checking for slashes + // each slash encountered requires a "../" + while ( $from[++$posval] ) + { + // Check for slash + if ( ( $from[$posval] == "/" ) || ( $from[$posval] == "\\" ) ) + { + // Found a slash, add a "../" + $path .= "../"; + } + } + + // Search backwards to find where the first common directory + // as some letters in the first different directory names + // may have been the same + $diffpos--; + while ( ( $to[$diffpos] != "/" ) && ( $to[$diffpos] != "\\" ) && $to[$diffpos] ) + { + $diffpos--; + } + // Build relative path to return + + return ( $path . substr( $target, $diffpos+1, strlen( $target ) ) ); + } +} + +/****************************************************************************** +* End of Function: get_relative_path +******************************************************************************/ + + +?>
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