151 lines
5.6 KiB
PHP
151 lines
5.6 KiB
PHP
<?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
|
|
******************************************************************************/
|
|
|
|
|
|
?>
|