/**
* Rolls back a filesystem transaction, it is safe to rollback when no transaction is in progress
*
* @return void
*/
public static function rollback()
{
if (self::$rollback_operations === NULL) {
return;
}
self::$rollback_operations = array_reverse(self::$rollback_operations);
foreach (self::$rollback_operations as $operation) {
switch ($operation['action']) {
case 'append':
$current_length = filesize($operation['filename']);
$handle = fopen($operation['filename'], 'r+');
ftruncate($handle, $current_length - $operation['length']);
fclose($handle);
break;
case 'delete':
self::updateDeletedMap($operation['filename'], debug_backtrace());
unlink($operation['filename']);
fFilesystem::updateFilenameMap($operation['filename'], '*DELETED at ' . time() . ' with token ' . uniqid('', TRUE) . '* ' . $operation['filename']);
break;
case 'write':
file_put_contents($operation['filename'], $operation['old_data']);
break;
case 'rename':
fFilesystem::updateFilenameMap($operation['new_name'], $operation['old_name']);
rename($operation['new_name'], $operation['old_name']);
break;
}
}
// All files to be deleted should have their backtraces erased
foreach (self::$commit_operations as $operation) {
if (isset($operation['object'])) {
self::updateDeletedMap($operation['object']->getPath(), NULL);
fFilesystem::updateFilenameMap($operation['object']->getPath(), preg_replace('#*DELETED at \\d+ with token [\\w.]+* #', '', $operation['filename']));
}
}
self::$commit_operations = NULL;
self::$rollback_operations = NULL;
}
/**
* Rolls back a filesystem transaction, it is safe to rollback when no transaction is in progress
*
* @return void
*/
public static function rollback()
{
self::$rollback_operations = array_reverse(self::$rollback_operations);
foreach (self::$rollback_operations as $operation) {
switch ($operation['action']) {
case 'delete':
self::updateExceptionMap($operation['filename'], new fProgrammerException('The action requested can not be performed because the file has been deleted'));
unlink($operation['filename']);
break;
case 'write':
file_put_contents($operation['filename'], $operation['old_data']);
break;
case 'rename':
fFilesystem::updateFilenameMap($operation['new_name'], $operation['old_name']);
rename($operation['new_name'], $operation['old_name']);
break;
}
}
// All files to be deleted should have their exceptions erased
foreach (self::$commit_operations as $operation) {
if (isset($operation['object'])) {
self::updateExceptionMap($operation['object']->getPath(), NULL);
}
}
self::$commit_operations = NULL;
self::$rollback_operations = NULL;
}
/**
* Renames the current file
*
* If the filename already exists and the overwrite flag is set to false,
* a new filename will be created.
*
* This operation will be reverted if a filesystem transaction is in
* progress and is later rolled back.
*
* @param string $new_filename The new full path to the file or a new filename in the current directory
* @param boolean $overwrite If the new filename already exists, `TRUE` will cause the file to be overwritten, `FALSE` will cause the new filename to change
* @return fFile The file object, to allow for method chaining
*/
public function rename($new_filename, $overwrite)
{
$this->tossIfDeleted();
if (!$this->getParent()->isWritable()) {
throw new fEnvironmentException('The file, %s, can not be renamed because the directory containing it is not writable', $this->file);
}
// If the filename does not contain any folder traversal, rename the file in the current directory
if (preg_match('#^[^/\\\\]+$#D', $new_filename)) {
$new_filename = $this->getParent()->getPath() . $new_filename;
}
$info = fFilesystem::getPathInfo($new_filename);
if (!file_exists($info['dirname'])) {
throw new fProgrammerException('The new filename specified, %s, is inside of a directory that does not exist', $new_filename);
}
// Make the filename absolute
$new_filename = fDirectory::makeCanonical(realpath($info['dirname'])) . $info['basename'];
if ($this->file == $new_filename && $overwrite) {
return $this;
}
if (file_exists($new_filename) && !$overwrite) {
$new_filename = fFilesystem::makeUniqueName($new_filename);
}
if (file_exists($new_filename)) {
if (!is_writable($new_filename)) {
throw new fEnvironmentException('The new filename specified, %s, already exists, but is not writable', $new_filename);
}
if (fFilesystem::isInsideTransaction()) {
fFilesystem::recordWrite(new fFile($new_filename));
}
// Windows requires that the existing file be deleted before being replaced
unlink($new_filename);
} else {
$new_dir = new fDirectory($info['dirname']);
if (!$new_dir->isWritable()) {
throw new fEnvironmentException('The new filename specified, %s, is inside of a directory that is not writable', $new_filename);
}
}
rename($this->file, $new_filename);
// Allow filesystem transactions
if (fFilesystem::isInsideTransaction()) {
fFilesystem::recordRename($this->file, $new_filename);
}
fFilesystem::updateFilenameMap($this->file, $new_filename);
return $this;
}
/**
* Saves any changes to the image
*
* If the file type is different than the current one, removes the current
* file once the new one is created.
*
* This operation will be reverted by a filesystem transaction being rolled
* back. If a transaction is in progress and the new image type causes a
* new file to be created, the old file will not be deleted until the
* transaction is committed.
*
* @param string $new_image_type The new file format for the image: 'NULL` (no change), `'jpg'`, `'gif'`, `'png'`
* @param integer $jpeg_quality The quality setting to use for JPEG images - this may be ommitted
* @param boolean $overwrite If an existing file with the same name and extension should be overwritten
* @param string :$new_image_type
* @param boolean :$overwrite
* @return fImage The image object, to allow for method chaining
*/
public function saveChanges($new_image_type = NULL, $jpeg_quality = 90, $overwrite = FALSE)
{
// This allows ommitting the $jpeg_quality parameter, which is very useful for non-jpegs
$args = func_get_args();
if (count($args) == 2 && is_bool($args[1])) {
$overwrite = $args[1];
$jpeg_quality = 90;
}
$this->tossIfDeleted();
self::determineProcessor();
if (self::$processor == 'none') {
throw new fEnvironmentException("The changes to the image can't be saved because neither the GD extension or ImageMagick appears to be installed on the server");
}
$type = self::getImageType($this->file);
if ($type == 'tif' && self::$processor == 'gd') {
throw new fEnvironmentException('The image specified, %s, is a TIFF file and the GD extension can not handle TIFF files. Please install ImageMagick if you wish to manipulate TIFF files.', $this->file);
}
$valid_image_types = array('jpg', 'gif', 'png');
if ($new_image_type !== NULL && !in_array($new_image_type, $valid_image_types)) {
throw new fProgrammerException('The new image type specified, %1$s, is invalid. Must be one of: %2$s.', $new_image_type, join(', ', $valid_image_types));
}
if (is_numeric($jpeg_quality)) {
$jpeg_quality = (int) round($jpeg_quality);
}
if (!is_integer($jpeg_quality) || $jpeg_quality < 1 || $jpeg_quality > 100) {
throw new fProgrammerException('The JPEG quality specified, %1$s, is either not an integer, less than %2$s or greater than %3$s.', $jpeg_quality, 1, 100);
}
if ($new_image_type && fFilesystem::getPathInfo($this->file, 'extension') != $new_image_type) {
if ($overwrite) {
$path_info = fFilesystem::getPathInfo($this->file);
$output_file = $path_info['dirname'] . $path_info['filename'] . '.' . $new_image_type;
} else {
$output_file = fFilesystem::makeUniqueName($this->file, $new_image_type);
}
if (file_exists($output_file)) {
if (!is_writable($output_file)) {
throw new fEnvironmentException('Changes to the image can not be saved because the file, %s, is not writable', $output_file);
}
} else {
$output_dir = dirname($output_file);
if (!is_writable($output_dir)) {
throw new fEnvironmentException('Changes to the image can not be saved because the directory to save the new file, %s, is not writable', $output_dir);
}
}
} else {
$output_file = $this->file;
if (!is_writable($output_file)) {
throw new fEnvironmentException('Changes to the image can not be saved because the file, %s, is not writable', $output_file);
}
}
// If we don't have any changes and no name change, just exit
if (!$this->pending_modifications && $output_file == $this->file) {
return $this;
}
// Wrap changes to the image into the filesystem transaction
if ($output_file == $this->file && fFilesystem::isInsideTransaction()) {
fFilesystem::recordWrite($this);
}
if (self::$processor == 'gd') {
$this->processWithGD($output_file, $jpeg_quality);
} elseif (self::$processor == 'imagemagick') {
$this->processWithImageMagick($output_file, $jpeg_quality);
}
$old_file = $this->file;
fFilesystem::updateFilenameMap($this->file, $output_file);
// If we created a new image, delete the old one
if ($output_file != $old_file) {
$old_image = new fImage($old_file);
$old_image->delete();
}
$this->pending_modifications = array();
return $this;
}
