o
    6d.                     @   s   d dl Z d dlZd dlZddlmZ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g d eejd dS )    N   )Image	ImageFile_binaryc                   @   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   lC:\Users\jesus\OneDrive\Desktop\erpjis_fastapi\backend\jisbackend\Lib\site-packages\PIL/Jpeg2KImagePlugin.py__init__   s   

zBoxReader.__init__c                 C   s6   | j r| j | | jkrdS | jdkr|| jkS dS )NFr   T)r	   r   tellr
   r   )r   	num_bytesr   r   r   	_can_read#   s
   

zBoxReader._can_readc                 C   sh   |  |sd}t|| j|}t||k r&d| dt| d}t|| jdkr2|  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   msgdatar   r   r   _read_bytes-   s   

zBoxReader._read_bytesc                 C   s    t |}| |}t ||S N)structcalcsizer   unpack)r   Zfield_formatsizer   r   r   r   read_fields;   s   

zBoxReader.read_fieldsc                 C   s    | j }| |}tt||S r   )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 )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r&| dd }d}nd}||k s3| || s9d}t||| | _ |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   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$  |  d}t|}||  |d  }td|\}}}}}}}	}	}	}	}
dg|
 }dg|
 }dg|
 }t|
D ]}td|dd|  \||< ||< ||< q7|| || f}|
dkrn|d d	@ d
krhd}||fS d}||fS |
dkrxd}||fS |
dkrd}||fS |
dkrd}||fS d}||fS )zParse the JPEG 2000 codestream to extract the size and component
    count from the SIZ marker segment, returning a PIL (size, mode) tuple.   z>HHIIIIIIIIHNz>BBB$      r   r      r'   I;16LLARGB   RGBA)r   r   i16ber   unpack_fromrange)r   hdrZlsizZsizZrsizZxsizZysizZxosizZyosiz_ZcsizZssizZxrsizZyrsizir   moder   r   r   _parse_codestreama   s:   




*
rB   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   )numdenomexpr   r   r   _res_to_dpi   s   rH   c                 C   s  t | }d}d}| r,| }|dkr| }n|dkr(|dd dkr(d}| sd}d}d}d}d}	| r| }|dkrx|d	\}
}}}||
f}|d
kr\|d@ dkr\d}nX|d
krcd}nQ|dkrjd}nJ|dkrqd}nC|dkrwd}n<|dkr| }| r| }|dkr|d\}}}}}}t|||}t|||}|dur|dur||f}	n| s| s:|du s|du rd}t|||||	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   r4   r'   r5   r6   r1   r7   r3   r8   r9   r:   s   res s   rescz>HHHHBBzMalformed JP2 header)r   r%   r,   r#   r    rH   r   )r   readerheadermimetyper+   r   rA   ZbpcncdpiheightwidthresZtresZvrcnZvrcdZhrcnZhrcdZvrceZhrceZhresZvresr   r   r   r   _parse_jp2_header   sd   
rQ   c                       sN   e Zd ZdZdZd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   s~  | j d}|dkrd| _t| j \| _| _n:|| j d }|dkrKd| _t| j }|\| _| _| _}|d ur=|| jd< | j d	d	rJ| 
  nd
}t|| jd u s[| jd u rad}t|d| _d| _d}d}z| j  }t|j}W n1 ty   d}z| j  }| j dtj | j  }| j | W n ty   d}Y nw Y nw dd| j d| j| j| j||ffg| _d S )Nr9      OQj2kr'         jP  

jp2rM      s   jp2cOQznot a JPEG 2000 filezunable to determine size/moder   r   jpeg2kr   r   )r   r   codecrB   _sizerA   rQ   Zcustom_mimetypeinfoendswith_parse_commentr   r   _reducelayersfilenor)   fstatst_size	Exceptionr   r(   r!   SEEK_ENDtile)r   sigrJ   rM   r   fdr
   posr   r   r   _open   sX   





zJpeg2KImageFile._openc                 C   s   | j d}t|}| j |d tj 	 | j d}|s d S |d }|dv r*d S | j d}t|}|dkrJ| j |d dd  | jd< d S | j |d tj q)Nr1   Tr   )      d   comment)r   r   r   r;   r(   r)   r*   r\   )r   r>   r
   markertypr   r   r   r^     s"   

zJpeg2KImageFile._parse_commentc                    s   | j pt jS r   )r_   superreducer$   	__class__r   r   rr     s   zJpeg2KImageFile.reducec                 C   s
   || _ d S r   )r_   )r   valuer   r   r   rr      s   
c                 C   s   | j rO| jrOd| j> }|d? }t| jd | | t| jd | | f| _| j d }|d d | j| j|d d |d d f}|d d| j |d |fg| _ tj| S )Nr   r   r3   r9   rY   r1   )rf   r_   intr   r[   r`   r   load)r   poweradjusttt3r   r   r   rw   $  s   

*zJpeg2KImageFile.load)r-   r.   r/   formatformat_descriptionrj   r^   propertyrr   setterrw   __classcell__r   r   rs   r   rR      s    4
rR   c                 C   s    | d d dkp| d d dkS )Nr9   rS   rW   rU   r   )prefixr   r   r   _accept5  s   r   c                 C   s  | j }|ds|ddrd}nd}|dd }|dd }|dd }|d	d
}|dd }	|	d urKt|	ttfrEtdd |	D sKd}
t|
|dd}|dd }|dd }|dd}|dd}|dd}|dd}|dd}|d}t|tr|	 }|dd}d}t
|drz| }W n ty   d}Y nw |||||	|||||||||||f| _t| |dd| j d|fg d S ) N.j2kZno_jp2FrT   rV   offsettile_offset	tile_sizequality_modeZratesquality_layersc                 S   s   g | ]	}t |ttfqS r   )
isinstancerv   float).0Zquality_layerr   r   r   
<listcomp>Q  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_modenomctsignedrn   pltr   ra   rX   rY   )Zencoderinfor]   getr   listtupleall
ValueErrorstrencodehasattrra   rd   Zencoderconfigr   _saver   )Zimr   filenamer\   kindr   r   r   r   r   r   r   Z	cblk_sizer   r   r   r   r   r   rn   r   rh   r   r   r   r   @  sr   	


"r   )z.jp2r   z.jpcz.jpfz.jpxz.j2cz	image/jp2)r!   r)   r    r   r   r   r   rB   rH   rQ   rR   r   r   Zregister_openr|   Zregister_saveZregister_extensionsZregister_mimer   r   r   r   <module>   s"   J"@jH
