"""Local File System product"""
__doc__="""Local File System product"""

from ZPublisher.Iterators import filestream_iterator
from OFS.Image import File

class StreamingFile(File):
    """ wrapper around OFS.Image.File that does streaming from the file"""
    def index_html(self, REQUEST, RESPONSE):
	"""    XXX FIXME: this doesn't have range support etc.
               Note: this relies on _wrap_ob(self) having been called by now.
	"""
	threshold = 2 << 16 # 128 kb
	if self.size < threshold or RESPONSE is None:
	    try:
		f = open(self._local_path, 'rb')
		return f.read()
	    finally:
		f.close()
	else:
	    RESPONSE.setHeader('Content-Length', self.size)
	    RESPONSE.setHeader('Content-Type', self.content_type)
	    return filestream_iterator(self._local_path, 'rb')