B
    zb(              	   @   s   d dl Z d dlZd dlZddlmZmZ G dd dZdd Zdd	 Zd
d Z	G dd dejZ
dd Zdd Zee
je
e ee
je ee
jddddddg ee
jd dS )    N   )Image	ImageFilec               @   sJ   e Zd ZdZdddZdd Zdd Zd	d
 Zdd Zdd Z	dd Z
dS )	BoxReaderz}
    A small helper class to read fields stored in JPEG2000 header boxes
    and to easily step into and read sub-boxes.
    c             C   s    || _ |dk| _|| _d| _d S )Nr   r   )fp
has_lengthlengthremaining_in_box)selfr   r	    r   4lib/python3.7/site-packages/PIL/Jpeg2KImagePlugin.py__init__   s    
zBoxReader.__init__c             C   s:   | j r| j | | jkrdS | jdkr2|| jkS dS d S )NFr   T)r   r   tellr	   r
   )r   	num_bytesr   r   r   	_can_read#   s
    

zBoxReader._can_readc             C   s`   |  |std| j|}t||k rDtd| dt| d| jdkr\|  j|8  _|S )NzNot enough data in headerzExpected to read z bytes but only got .r   )r   SyntaxErrorr   readlenOSErrorr
   )r   r   datar   r   r   _read_bytes-   s    

zBoxReader._read_bytesc             C   s    t |}| |}t ||S )N)structZcalcsizer   unpack)r   Zfield_formatsizer   r   r   r   read_fields;   s    

zBoxReader.read_fieldsc             C   s    | j }| |}tt||S )N)r
   r   r   ioBytesIO)r   r   r   r   r   r   
read_boxes@   s    
zBoxReader.read_boxesc             C   s$   | j r| j | j | jk S dS d S )NT)r   r   r   r
   r	   )r   r   r   r   has_next_boxE   s    zBoxReader.has_next_boxc             C   s|   | j dkr| j| j tj d| _ | d\}}|dkrL| dd }d}nd}||k sf| || sntd|| | _ |S )	Nr   r   z>I4sr   z>Q      zInvalid header length)r
   r   seekosSEEK_CURr   r   r   )r   ZlboxtboxZhlenr   r   r   next_box_typeK   s    

zBoxReader.next_box_typeN)r   )__name__
__module____qualname____doc__r   r   r   r   r   r    r'   r   r   r   r   r      s   

r   c             C   s  |  d}td|d }||  |d  }td|\}}}}}}}	}	}	}	}
dg|
 }dg|
 }dg|
 }x8t|
D ],}td|dd|  \||< ||< ||< qvW || || f}|
d	kr|d d
@ dkrd}nd}n0|
dkrd}n"|
dkrd}n|
dkrd}nd}||fS )zParse the JPEG 2000 codestream to extract the size and component
    count from the SIZ marker segment, returning a PIL (size, mode) tuple.   z>Hr   z>HHIIIIIIIIHNz>BBB$      r      r"   zI;16LLARGB   RGBA)r   r   r   Zunpack_fromrange)r   ZhdrZlsizZsizZrsizZxsizZysizZxosizZyosiz_ZcsizZssizZxrsizZyrsizir   moder   r   r   _parse_codestream`   s.    



,
r9   c             C   s$   |dkr d|  d|  d|  S dS )zConvert JPEG2000's (numerator, denominator, exponent-base-10) resolution,
    calculated as (num / denom) * 10^exp and stored in dots per meter,
    to floating-point dots per inch.r      
   i'  Nr   )ZnumZdenomZexpr   r   r   _res_to_dpi   s    r<   c             C   s  t | }d}d}xF| rV| }|dkr6| }P q|dkr|dd dkrd}qW d}d}d}d}d}	x
| rx| }|dkr|d	\}
}}}||
f}|d
kr|d@ dkrd}n6|d
krd}n(|dkrd}n|dkrd}n|dkrd}qp|dkrp| }xn| rt| }|dkr|d\}}}}}}t|||}t|||}|dk	rn|dk	rn||f}	P qW qpW |dks|dkrtd||||	fS )zParse the JP2 header box to extract size, component count,
    color space information, and optionally DPI information,
    returning a (size, mode, mimetype, dpi) tuple.Ns   jp2hs   ftypz>4sr   s   jpx z	image/jpxs   ihdrz>IIHBr   r/   r"   zI;16r0   r,   r1   r.   r2   r3   r4   s   res s   rescz>HHHHBBzMalformed JP2 header)r   r    r'   r   r   r<   r   )r   readerheaderZmimetyper&   r   r8   ZbpcZncdpiZheightwidthZresZtresZvrcnZvrcdZhrcnZhrcdZvrceZhrceZhresZvresr   r   r   _parse_jp2_header   sZ    

rA   c                   sF   e Zd ZdZdZdd Ze fddZejdd Zdd	 Z	  Z
S )
Jpeg2KImageFileZJPEG2000zJPEG 2000 (ISO 15444)c             C   sd  | j d}|dkr.d| _t| j \| _| _nV|| j d }|dkr|d| _t| j }|\| _| _| _}|d k	r|| jd< nt	d| j
d ks| jd krt	d	d
| _d
| _d}d}y| j  }t|j}W nj tk
r8   d}y4| j  }| j d
tj | j  }| j | W n tk
r2   d}Y nX Y nX dd| j
 d
| j| j| j||ffg| _d S )Nr3   s   OQj2kr"   s      jP  

jp2r?   znot a JPEG 2000 filezunable to determine size/moder   r   jpeg2k)r   r   )r   r   codecr9   _sizer8   rA   Zcustom_mimetypeinfor   r   _reducelayersfilenor$   fstatst_size	Exceptionr   r#   r   SEEK_ENDtile)r   Zsigr>   r?   fdr	   posr   r   r   _open   sD    



zJpeg2KImageFile._openc                s   | j pt jS )N)rI   superreduce)r   )	__class__r   r   rU      s    zJpeg2KImageFile.reducec             C   s
   || _ d S )N)rI   )r   valuer   r   r   rU     s    c             C   s   | j r| jrd| j> }|d? }t| jd | | t| jd | | f| _| j d }|d d | j| j|d d |d d f}|d d| j |d |fg| _ tj| S )Nr   r   r.   r3   )r   r   r,   )rP   rI   intr   rG   rJ   r   load)r   ZpowerZadjusttZt3r   r   r   rY     s    

*zJpeg2KImageFile.load)r(   r)   r*   formatZformat_descriptionrS   propertyrU   setterrY   __classcell__r   r   )rV   r   rB      s   0rB   c             C   s    | d d dkp| d d dkS )Nr3   s   OQ   s      jP  

r   )prefixr   r   r   _accept  s    ra   c             C   s`  | j }|ds|ddr"d}nd}|dd }|dd }|dd }|d	d
}|dd }	|	d k	rt|	ttfrtdd |	D std|dd}
|dd }|dd }|dd}|dd}|dd}|dd}d}t|dry|	 }W n t
k
r   d}Y nX |||||	|
|||||||f| _t| |dd| j d|fg d S )Nz.j2kZno_jp2FrC   rD   offsettile_offset	tile_sizequality_modeZratesquality_layersc             S   s   g | ]}t |ttfqS r   )
isinstancerX   float).0Zquality_layerr   r   r   
<listcomp>6  s   z_save.<locals>.<listcomp>z,quality_layers must be a sequence of numbersnum_resolutionsr   Zcodeblock_sizeprecinct_sizeirreversibleprogressionZLRCPcinema_modeZnomctr   rK   rE   )r   r   )Zencoderinfoendswithgetrg   listtupleall
ValueErrorhasattrrK   rN   Zencoderconfigr   _saver   )Zimr   filenamerH   Zkindrb   rc   rd   re   rf   rk   Z	cblk_sizerl   rm   rn   ro   rp   rQ   r   r   r   rx   $  sT    

rx   z.jp2z.j2kz.jpcz.jpfz.jpxz.j2cz	image/jp2)r   r$   r    r   r   r   r9   r<   rA   rB   ra   rx   Zregister_openr[   Zregister_saveZregister_extensionsZregister_mimer   r   r   r   <module>   s   I"?P?