File manager - Edit - /opt/gsutil/third_party/crcmod/python3/crcmod/__pycache__/crcmod.cpython-39.pyc
Back
a �*L�@ � @ sF d Z d�� ZzddlmZ dZW n" eyB ddlm Z dZY n0 ddl Z ddl Z G dd� d�Z d%d d �Z d d � Zd d� Zdd� Zdd� Zdd� Zdd� Zejejgejejgejejgejejgej ej gd�Z i Z d�� D ]<Z dddd d ��!e �"e �d�Z#e#dur�e#e vr�d e e e#< q�e d e d < [ [#d d!� Z$d"d#� Z%d$Z&dS )&ay crcmod is a Python module for gererating objects that compute the Cyclic Redundancy Check. Any 8, 16, 24, 32, or 64 bit polynomial can be used. The following are the public components of this module. Crc -- a class that creates instances providing the same interface as the algorithms in the hashlib module in the Python standard library. These instances also provide a method for generating a C/C++ function to compute the CRC. mkCrcFun -- create a Python function to compute the CRC using the specified polynomial and initial value. This provides a much simpler interface if all you need is a function for CRC calculation. z mkCrcFun Crc � NTFc @ sV e Zd ZdZddd�Zdd� Zdd d �Zd d � Zdd� Zdd� Z dd� Z ddd�Z d S )�Crca� Compute a Cyclic Redundancy Check (CRC) using the specified polynomial. Instances of this class have the same interface as the algorithms in the hashlib module in the Python standard library. See the documentation of this module for examples of how to use a Crc instance. The string representation of a Crc instance identifies the polynomial, initial value, XOR out value, and the current CRC value. The print statement can be used to output this information. If you need to generate a C/C++ function for use in another application, use the generateCode method. If you need to generate code for another language, subclass Crc and override the generateCode method. The following are the parameters supplied to the constructor. poly -- The generator polynomial to use in calculating the CRC. The value is specified as a Python integer. The bits in this integer are the coefficients of the polynomial. The only polynomials allowed are those that generate 8, 16, 24, 32, or 64 bit CRCs. initCrc -- Initial value used to start the CRC calculation. This initial value should be the initial shift register value XORed with the final XOR value. That is equivalent to the CRC result the algorithm should return for a zero-length string. Defaults to all bits set because that starting value will take leading zero bytes into account. Starting with zero will ignore all leading zero bytes. rev -- A flag that selects a bit reversed algorithm when True. Defaults to True because the bit reversed algorithms are more efficient. xorOut -- Final value to XOR with the calculated CRC value. Used by some CRC algorithms. Defaults to zero. ���Tr c C sh |sd S t |||�\}}}|d | _|| _|| _|| _|| _t|||||�\}}|| _|| _| j| _ d S )N� ) � _verifyParams� digest_size�initCrc�xorOut�poly�reverse� _mkCrcFun�_crc�table�crcValue) �selfr r �revr � initialize�sizeBits�crcfunr � r �7/opt/gsutil/third_party/crcmod/python3/crcmod/crcmod.py�__init__Y s z Crc.__init__c C sx g }|� d| j � |� d| j � d| jd }|� d|| j � |� d|| j � |� d|| j � d�|�S ) Nz poly = 0x%Xz reverse = %s�0x%%0%dX� z initCrc = %sz xorOut = %sz crcValue = %s� )�appendr r r r r r �join)r �lst�fmtr r r �__str__m s z Crc.__str__Nc C sb t ddd�}| j|_| j|_| j|_| j|_| j|_| j|_| j|_| j|_|dur^|� |� |S )a Create a new instance of the Crc class initialized to the same values as the original instance. The current CRC is set to the initial value. If a string is provided in the optional arg parameter, it is passed to the update method. NF)r r ) r r r r r r r r r �update)r �arg�nr r r �neww s zCrc.newc C s | � � }| j|_|S )z�Create a new instance of the Crc class initialized to the same values as the original instance. The current CRC is set to the current value. This allows multiple CRC calculations using a common initial string. )r" r )r �cr r r �copy� s zCrc.copyc C s | � || j�| _dS )z_Update the current CRC value using the string specified as the data parameter. N)r r )r �datar r r r � s z Crc.updatec C sH | j }| j}g }|dkr8|�|d@ � |d? }|d8 }q|�� t|�S )z�Return the current CRC value as a string of bytes. The length of this string is specified in the digest_size attribute. r � r � )r r r r �bytes�r r! �crcr r r r �digest� s z Crc.digestc C sN | j }| j}g }|dkr<|�d|d@ � |d? }|d8 }q|�� d�|�S )z�Return the current CRC value as a string of hex digits. The length of this string is twice the digest_size attribute. r z%02Xr& r r' � )r r r r r r) r r r � hexdigest� s z Crc.hexdigestc C s| |du r d}|du r2d| j }|dkr*d}d| }| j dkrBd}n"| jrNd }nd| j d }d | }d d | j }| j d kr�|d }n|d }ddd d d d�| j } g } t| j�D ],\} } | | dkr�| �d� | �|| � q�d| j } | jr�| d } | j�r d|dd� | j }|}nd}d}| j dk�rJ| j�rB|d7 }n|d7 }||||| d�| �| ||d�}|�t | � dS )a( Generate a C/C++ function. functionName -- String specifying the name of the function. out -- An open file-like object with a write method. This specifies where the generated code is written. dataType -- An optional parameter specifying the data type of the input data to the function. Defaults to UINT8. crcType -- An optional parameter specifying the data type of the CRC value. Defaults to one of UINT8, UINT16, UINT32, or UINT64 depending on the size of the CRC value. NZUINT8r � � zUINT%dr' ztable[*data ^ (%s)crc]z#table[*data ^ (%s)crc] ^ (crc >> 8)z,table[*data ^ (%%s)(crc >> %d)] ^ (crc << 8)r r � zU,zULL,)r' r � r0 r r z zpolynomial: 0x%Xz, bit reverse algorithmz crc = crc ^ %s;r r, r1 z crc = crc & 0xFFFFFFU;)�dataType�crcType�name�crcAlgorZcrcTabler � preCondition� postCondition) r r � enumerater r r r r �write� _codeTemplate)r Z functionName�outr2 r3 �sizer5 �shiftr r! r �i�valr r6 r7 Zparmsr r r � generateCode� sZ � zCrc.generateCode)r Tr T)N)NN) �__name__� __module__� __qualname__�__doc__r r r" r$ r r+ r- r@ r r r r r 6 s " r r c C s& t | ||�\}}}t| ||||�d S )a Return a function that computes the CRC using the specified polynomial. poly -- integer representation of the generator polynomial initCrc -- default initial CRC value rev -- when true, indicates that the data is processed bit reversed. xorOut -- the final XOR value The returned function has the following user interface def crcfun(data, crc=initCrc): r )r r )r r r r r r r r �mkCrcFun s rE c C sJ d}dD ]4}d|> }|d }|| kr0|k rn q| S qt |��d S )Nz8The degree of the polynomial must be 8, 16, 24, 32 or 64�r � r. r/ �@ r' r )� ValueError)r �msgr! �low�highr r r � _verifyPoly' s rM c C s. d}t |�D ] }|d> | d@ B }| d? } q |S )Nr r' ��range)�xr! �yr> r r r �_bitrev3 s rR c C sP d|d > }t d�D ]"}| |@ r.| d> |A } q| d> } qd|> d }| |@ } | S )Nr' r rN )r* r r! �maskr> r r r �_bytecrc? s rT c C sD t d�D ]"}| d@ r"| d? |A } q| d? } qd|> d }| |@ } | S )Nr r' rN )r* r r! r> rS r r r � _bytecrc_rJ s rU c s0 d� > d }�|@ �� �fdd�t d�D �}|S )Nr' c s g | ]}t |� d > �� ��qS )r )rT ��.0r> �r! r r r � <listcomp>_ � z _mkTable.<locals>.<listcomp>� rN �r r! rS r r rX r �_mkTable\ s r] c s6 d� > d }t �|@ � ��� �fdd�td�D �}|S )Nr' c s g | ]}t |�� ��qS r )rU rV rX r r rY e rZ z _mkTable_r.<locals>.<listcomp>r[ )rR rO r\ r rX r � _mkTable_rb s r^ rF z B H I L Qr rG r/ rH )r' r r0 r z256%sr. c C s. t | �}d|> d }||@ }||@ }|||fS )Nr' )rM )r r r r rS r r r r � s r c s� |r t | |�}t| d }nt| |�}t| d }|}trPtjt| g|�R � }� dkrj|||fdd�}n|||f� fdd� }||fS )Nr' r c S s || ||�S �Nr �r% r* r Zfunr r r r � s z_mkCrcFun.<locals>.crcfunc s � || � |A |�A S r_ r r` �r r r r � s )r^ �_sizeMapr] �_usingExtension�struct�pack�_sizeToTypeCode) r r r r r Z tableListZ_funZ_tabler r ra r r � s r aK // Automatically generated CRC function // %(poly)s %(crcType)s %(name)s(%(dataType)s *data, int len, %(crcType)s crc) { static const %(crcType)s table[256] = {%(crcTable)s }; %(preCondition)s while (len > 0) { crc = %(crcAlgor)s; data++; len--; }%(postCondition)s return crc; } )r Tr )'rD �split�__all__Zcrcmod._crcfunextZ _crcfunextZ_crcfunrc � ImportErrorZcrcmod._crcfunpyZ _crcfunpy�sysrd r rE rM rR rT rU r] r^ Z_crc8Z_crc8rZ_crc16Z_crc16rZ_crc24Z_crc24rZ_crc32Z_crc32rZ_crc64Z_crc64rrb rf ZtypeCode�get�calcsizer< r r r: r r r r �<module> sB X �
| ver. 1.4 |
Github
|
.
| PHP 8.2.28 | Generation time: 0.02 |
proxy
|
phpinfo
|
Settings