Add qa_update_blob() to core functions

Question

I came across the situation that I am editing an image (a blob) that is already stored on the server (file system or db) and need to update the content of the blob (file system or db).

For the DB I was using:

qa_db_blob_set_content($blobid, $content)

However, for the file system there does not seem to be such an update function (?)

 

PS: qa_write_blob_file() gives me "failed to open stream: File exists"

Comments

How were you updating the image originally, when you were using the database? You say you were calling "qa_db_blob_set_content" but was this from a custom plugin?

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Before all files were stored on DB, now I store them on the file system. Thus I discovered the missing update function.

Answer 1

I wrote this function, originated from qa_write_blob_file():

 

        function qa_update_blob_file($blobid, $content, $format)
        /*
            Update the on-disk file for blob $blobid with $content and $format. Returns true if the write succeeded, false otherwise.
        */
        {
            $written = false;

            $directory = qa_get_blob_directory($blobid);
            if (is_dir($directory))
            {
                $filename = qa_get_blob_filename($blobid, $format);

                $file = fopen($filename, 'wa+'); // xb would create a new file, however, we replace it
                if(is_resource($file))
                {
                    if(fwrite($file, $content)>=strlen($content))
                        $written = true;

                    fclose($file);

                    if(!$written)
                        unlink($filename);
                }
            }

            return $written;
        }