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Filename :
Jpeg2KImagePlugin.cpython-310.pyc
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o Z#�a�( � @ s� d dl Z d dlZd dlZddlmZmZ G dd� d�Zdd� Zdd � Zd d � Z G d d � d ej�Z dd� Z dd� Z e� e je e � e�e je � e�e jg d�� e�e jd� dS )� N� )�Image� ImageFilec @ sJ e Zd ZdZddd�Zdd� Zdd� Zd d � Zd d � Zd d� Z dd� Z dS )� 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 || _ |dk| _|| _d| _d S )Nr r )�fp� has_length�length�remaining_in_box)�selfr r � r �7/usr/lib/python3/dist-packages/PIL/Jpeg2KImagePlugin.py�__init__ s zBoxReader.__init__c C s6 | j r| j�� | | jkrdS | jdkr|| jkS dS )NFr T)r r �tellr r )r � num_bytesr r r � _can_read# s zBoxReader._can_readc C s` | � |�s td��| j�|�}t|�|k r"td|� dt|�� d���| jdkr.| j|8 _|S )NzNot enough data in headerzExpected to read z bytes but only got �.r )r � SyntaxErrorr �read�len�OSErrorr )r r �datar r r � _read_bytes- s � zBoxReader._read_bytesc C s t �|�}| �|�}t �||�S �N)�struct�calcsizer �unpack)r � field_format�sizer r r r � read_fields; s zBoxReader.read_fieldsc C s | j }| �|�}tt�|�|�S r )r r r �io�BytesIO)r r r r r r � read_boxes@ s zBoxReader.read_boxesc C s | j r| j�� | j | jk S dS )NT)r r r r 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| �|| �s7td��|| | _ |S ) Nr r z>I4sr z>Q� � zInvalid header length)r r �seek�os�SEEK_CURr r r )r �lbox�tbox�hlenr r r � next_box_typeK s zBoxReader.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|�\ }}}}}}} } } } } dg| } dg| } dg| } t| �D ]}t�d|dd| �\| |< | |< | |< q:|| || f}| d krq| d d @ d krkd }||fS d }||fS | dkr{d}||fS | dkr�d}||fS | dkr�d}||fS d}||fS )z�Parse 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& �I;16�L�LA�RGB� �RGBA)r r r � unpack_from�range)r �hdr�lsiz�siz�rsiz�xsiz�ysiz�xosiz�yosiz�_�csiz�ssiz�xrsiz�yrsiz�ir �moder r r �_parse_codestream` s: � * � ����rM c C s$ |dkrd| d| d| S dS )z�Convert 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 �rS c C s� t | �}d}d}|�� r,|�� }|dkr|�� }n|dkr(|�d�d dkr(d}|�� s d}d}d}d}d} |�� r�|�� }|dkrx|�d �\} } }}| | f}|d kr\|d @ d kr\d }nX|d krcd}nQ|dkrjd}nJ|dkrqd}nC|dkrwd}n<|dkr�|�� } | �� r�| �� } | dkr�| �d�\}}}}}}t|||�}t|||�}|dur�|dur�||f} n| �� s�|�� s:|du s�|du r�td��|||| fS )z�Parse 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 r5 r& r6 r7 r2 r8 r4 r9 r: r; s res s rescz>HHHHBBzMalformed JP2 header)r r$ r- r" r rS r )r �reader�header�mimetyper+ r rL �bpc�nc�dpi�height�width�res�tres�vrcn�vrcd�hrcn�hrcd�vrce�hrce�hres�vresr r r �_parse_jp2_header� sb � � �� rf c sF e Zd ZdZdZdd� Ze� fdd��Zejdd� �Zdd � Z � Z S ) �Jpeg2KImageFile�JPEG2000zJPEG 2000 (ISO 15444)c C s\ | j �d�}|dkrd| _t| j �\| _| _n+|| j �d� }|dkr>d| _t| j �}|\| _| _| _}|d ur=|| jd< nt d��| j d u sL| jd u rPt d ��d | _ d | _ d }d }z | j � � }t�|�j}W n1 ty� d }z| j �� }| j �d tj� | j �� }| j �|� W n ty� d }Y nw Y nw d d | j d | j| j | j ||ffg| _d S )Nr: � �O�Q�j2kr& � jP � �jp2rY znot a JPEG 2000 filez unable to determine size/moder r �jpeg2k�r r )r r �codecrM �_sizerL rf �custom_mimetype�infor r �_reduce�layers�filenor( �fstat�st_size� Exceptionr r' r �SEEK_END�tile)r �sigrU rY �fdr �posr r r �_open� sP � ��� � �zJpeg2KImageFile._openc s | j pt� jS r )rs �super�reducer# �� __class__r r r� � s zJpeg2KImageFile.reducec C s || _ d S r )rs )r �valuer r r r� s c C s� | j rO| jrOd| j> }|d? 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