Jpeg2KImagePlugin.pyc
1 o 2 Y��c�* � @ s� d dl Z d dlZd dlZddlmZmZ G dd� d�Zdd� Zdd � Zd 3 d � Z G d d � d ej�Z 4 dd� Z dd� Z e� e 5 je 6 e � e�e 7 je � e�e 8 jg d�� e�e 9 jd� dS )� N� )�Image� ImageFilec @ sJ e Zd ZdZddd�Zdd� Zdd� Zd d 10 � Zd d � Zd d� Z dd� Z 11 dS )� BoxReaderz} 12 A small helper class to read fields stored in JPEG2000 header boxes 13 and to easily step into and read sub-boxes. 14 �����c C s || _ |dk| _|| _d| _d S )Nr r )�fp� 15 has_length�length�remaining_in_box)�selfr r � r ��C:\Users\Jacks.GUTTSPC\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.10_qbz5n2kfra8p0\LocalCache\local-packages\Python310\site-packages\PIL\Jpeg2KImagePlugin.py�__init__ s 16 17 zBoxReader.__init__c C s6 | j r| j�� | | jkrdS | jdkr|| jkS dS )NFr T)r r �tellr r 18 )r � num_bytesr r r � _can_read# s 19 20 21 zBoxReader._can_readc C sh | � |�s d}t|��| j�|�}t|�|k r&d|� dt|�� d�}t|��| jdkr2| j|8 _|S )NzNot enough data in headerzExpected to read z bytes but only got �.r )r � SyntaxErrorr �read�len�OSErrorr 22 )r r �msg�datar r r � _read_bytes- s 23 24 zBoxReader._read_bytesc C s t �|�}| �|�}t �||�S �N)�struct�calcsizer �unpack)r Z field_format�sizer r r r � read_fields; s 25 26 zBoxReader.read_fieldsc C s | j }| �|�}tt�|�|�S r )r 27 r r �io�BytesIO)r r r r r r � 28 read_boxes@ s 29 zBoxReader.read_boxesc C s | j r| j�� | j | jk S dS )NT)r r r r 30 r �r r r r � has_next_boxE s zBoxReader.has_next_boxc C s� | j dkr| j�| j tj� d| _ | �d�\}}|dkr&| �d�d }d}nd}||k s3| �|| �s9d}t|��|| | _ |S ) Nr r z>I4sr z>Q� � zInvalid header length)r 31 r �seek�os�SEEK_CURr r r )r Zlbox�tbox�hlenr r r r � next_box_typeK s 32 33 zBoxReader.next_box_typeN)r ) �__name__� 34 __module__� __qualname__�__doc__r r r r r" r$ r, r r r r r s 35 36 r c C s* | � d�}t�d|�d }|| � |d � }t�d|�\ }}}}}}} } } } } 37 dg| 38 } dg| 39 } dg| 40 } t| 41 �D ]}t�d|dd| �\| |< | |< | |< q:|| || f}| 42 d krq| d d 43 @ d krkd }||fS d }||fS | 44 dkr{d}||fS | 45 dkr�d}||fS | 46 dkr�d}||fS d}||fS )z�Parse the JPEG 2000 codestream to extract the size and component 47 count from the SIZ marker segment, returning a PIL (size, mode) tuple.� z>Hr z >HHIIIIIIIIHNz>BBB�$ � r � r& �I;16�L�LA�RGB� �RGBA)r r r � unpack_from�range)r �hdrZlsizZsizZrsizZxsizZysizZxosizZyosiz�_ZcsizZssizZxrsizZyrsiz�ir �moder r r �_parse_codestreama s: 48 � 49 50 51 * � 52 ����rA c C s$ |dkrd| d| d| S dS )z�Convert JPEG2000's (numerator, denominator, exponent-base-10) resolution, 53 calculated as (num / denom) * 10^exp and stored in dots per meter, 54 to floating-point dots per inch.r �� � 55 i' Nr )�num�denom�expr r r � _res_to_dpi� s �rG c C s� t | �}d}d}|�� r,|�� }|dkr|�� }n|dkr(|�d�d dkr(d}|�� s d}d}d}d}d} |�� r�|�� }|dkrx|�d �\} 56 } }}| | 57 f}|d 58 kr\|d @ d kr\d }nX|d 59 krcd}nQ|dkrjd}nJ|dkrqd}nC|dkrwd}n<|dkr�|�� } | �� r�| �� } | dkr�| �d�\}}}}}}t|||�}t|||�}|dur�|dur�||f} n| �� s�|�� s:|du s�|du r�d}t|��|||| fS )z�Parse the JP2 header box to extract size, component count, 60 color space information, and optionally DPI information, 61 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>HHHHBBzMalformed JP2 header)r r$ r, r" r rG r )r �reader�header�mimetyper* r r@ �bpc�nc�dpi�height�width�resZtresZvrcnZvrcdZhrcnZhrcdZvrceZhrceZhresZvresr r r r �_parse_jp2_header� sd � 62 � �� rQ c sF e Zd ZdZdZdd� Ze� fdd��Zejdd� �Zdd � Z � Z 63 S ) 64 �Jpeg2KImageFileZJPEG2000zJPEG 2000 (ISO 15444)c C sd | j �d�}|dkrd| _t| j �\| _| _n-|| j �d� }|dkr>d| _t| j �}|\| _| _| _}|d ur=|| jd< nd}t |��| j 65 d u sN| jd u rTd }t |��d 66 | _ d 67 | _ d }d }z | j � � }t�|�j}W n1 ty� d }z| j �� }| j �d 68 tj� | j �� }| j �|� W n ty� d }Y nw Y nw d d | j 69 d 70 | j| j | j ||ffg| _d S )Nr9 � �O�Q�j2kr& � jP 71 � 72 �jp2rM znot a JPEG 2000 filez unable to determine size/moder r �jpeg2k�r r )r r �codecrA �_sizer@ rQ �custom_mimetype�infor r �_reduce�layers�filenor( �fstat�st_size� Exceptionr r' r �SEEK_END�tile)r �sigrI rM r �fdr �posr r r �_open� sT 73 74 � 75 76 77 ��� � 78 �zJpeg2KImageFile._openc s | j pt� jS r )r] �super�reducer# �� __class__r r rj s zJpeg2KImageFile.reducec C s 79 || _ d S r )r] )r �valuer r r rj s 80 c C s� | j rO| jrOd| j> }|d? 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