ó
 šxTc           @   s÷   d  d l  m Z d  d l Z d Z d Z d  d l m Z d „  Z d „  Z d „  Z	 e
 d	 k ró d  d l Z x… e j d
 D]s Z e e ƒ \ Z Z Z Z Z d e e e e f GHe j e d ƒ j e ƒ Z e	 e e ƒ Z e rç e GHqy d GHqy Wn  d S(   iÿÿÿÿ(   t   divisionNiÒ  iá  (   t   Formatc         C   s    t  j |  d ƒ j d ƒ } d | d  k rU t j d | d ƒ d d k sQ t ‚ t Sd | d  k r� t j d	 | d ƒ d d k s‹ t ‚ t St d
 |  ‚ d S(   s]   Determine the byte order for the file from the magic numbers at the
  very start of the file.t   rbi   t   IIi   s   <Hi    i*   t   MMs   >Hs   %s not recognised as TIFFN(	   R   t	   open_filet   readt   structt   unpackt   AssertionErrort   LITTLE_ENDIANt
   BIG_ENDIANt   RuntimeError(   t   filenamet
   four_bytes(    (    sL   /public2/ftp/pub/ccp4/6.5/ccp4-6.5/lib/py2/dxtbx/format/FormatTIFFHelpers.pyt   tiff_byte_order   s    &&c         C   s'  d } d } d } d } d } t |  ƒ } t j |  d ƒ j d ƒ } | t k r` d } d } n d } d } t j | | d d !ƒ d	 }	 t j | | |	 |	 d
 !ƒ d	 }
 |	 d
 } x]t |
 ƒ D]O} t j | | | | d
 !ƒ d	 } | d
 7} t j | | | | d
 !ƒ d	 } | d
 7} t j | | | | d !ƒ d	 } | d 7} | d k r‚t j | | | | d !ƒ d	 } | d 7} n: | d k r¼t j | | | | d
 !ƒ d	 } | d 7} n  | d k rÑ| } qÁ | d k ræ| } qÁ | d k rû| } qÁ | d k rÁ | } qÁ qÁ W| | | | | f S(   sY   Read the TIFF header (assuming for the moment a 4k header...) and
  return ... something.R   i   s   <Is   <Hs   >Is   >Hi   i   i    i   i   i   i  i  i  N(	   t   NoneR   R   R   R   R
   R   R   t   range(   R   t   image_widtht   image_heightt   image_deptht   header_sizet
   byte_ordert   tiff_headert   _It   _Ht   offsett   ntagst   startt   jt	   type_desct	   type_typet	   type_sizet   type_offset_or_value(    (    sL   /public2/ftp/pub/ccp4/6.5/ccp4-6.5/lib/py2/dxtbx/format/FormatTIFFHelpers.pyt   read_basic_tiff_header"   sN    	!
!
!
!
			c         C   sñ  | t  k r d } d } n d } d } t j | |  d d !ƒ d } t j | |  | | d !ƒ d } | d } d } xut | ƒ D]g} t j | |  | | d !ƒ d }	 | d 7} t j | |  | | d !ƒ d }
 | d 7} t j | |  | | d !ƒ d } | d 7} |
 d k rCt j | |  | | d !ƒ d } | d 7} nt |
 d	 k r}t j | |  | | d !ƒ d } | d 7} n: |
 d k r·t j | |  | | d !ƒ d } | d 7} n  |	 d
 k r‚ | } | | } |  | | !j ƒ  } q‚ q‚ W| S(   s0   Search the TIFF header for an image description.s   <Is   <Hs   >Is   >Hi   i   i    i   i   i  N(   R
   R   R   R   R   t   strip(   R   R   R   R   R   R   R   t   header_textR   R   R   R    R!   t   end(    (    sL   /public2/ftp/pub/ccp4/6.5/ccp4-6.5/lib/py2/dxtbx/format/FormatTIFFHelpers.pyt   read_tiff_image_descriptionZ   sB    	!
!
!
!

t   __main__i   s   (%d x %d) @ %d + %dR   s   No text found(   t
   __future__R    R   R
   R   t   dxtbx.format.FormatR   R   R"   R&   t   __name__t   syst   argvt   argt   widtht   heightt   deptht   headert   orderR   R   R   t   text(    (    (    sL   /public2/ftp/pub/ccp4/6.5/ccp4-6.5/lib/py2/dxtbx/format/FormatTIFFHelpers.pyt   <module>   s"   		8	-