a cfz@sdZdZdZddlZddlZddlZddlmZddlm Z ddl m Z m Z m Z mZmZmZmZdd lmZmZmZmZmZmZdd lmZdd lmZdd lmZdd lmZ ddlm!Z"ddlm#Z$ddlm%Z&ddl'm(Z(m)Z)m*Z*ddl+m,Z,m-Z-m.Z.m/Z/e0e0dddZ1GdddZ2GdddZ3GdddZ4GdddZ5GdddZ6Gd d!d!Z7Gd"d#d#Z8Gd$d%d%Z9Gd&d'd'Z:e ee0e;fd(d)d*ZdS)0zb Implementation of stream filters for PDF. See TABLE H.1 Abbreviations for standard filter names zMathieu Fenniakzbiziqe@mathieu.fenniak.netN) a85decode)BytesIO)AnyDictListOptionalTupleUnioncast)WHITESPACES_AS_BYTESb_deprecate_with_replacementdeprecation_no_replacementlogger_warningord_)CcittFaxDecodeParameters) ColorSpaces)FilterTypeAbbreviations) FilterTypes)ImageAttributes)LzwFilterParameters)StreamAttributes)DeprecationError PdfReadErrorPdfStreamError) ArrayObjectDictionaryObjectIndirectObject NullObjectdatareturncsz tWStjyztWYStjyttjdB}d}fddttDD],}z|||7}WqntjyYqn0qn|YYS0Yn0dS)a^ Decompress the given data using zlib. This function attempts to decompress the input data using zlib. If the decompression fails due to a zlib error, it falls back to using a decompression object with a larger window size. Args: data: The input data to be decompressed. Returns: The decompressed data. csg|]}||dqS)r .0ir!r%J/home/httpd/docs/test/DocsMgr/lib/python3.9/site-packages/pypdf/filters.py \r$zdecompress..N)zlib decompresserror decompressobj MAX_WBITSrangelen)r!dZ result_strbr%r)r*r-Ds r-c@sZeZdZed eeeeedddZeee e edddZ ed ee ed d d Z dS) FlateDecodeNr! decode_parmskwargsr"c Ksd|vrtddd|d}t|tr.tdt|}d}|rfz|dd}WnttfydYn0|dkrd}ztt |t j  }Wntt fyd}Yn0ztt |t j }Wntt fyd}Yn0ztt |t j }Wntt fy|}Yn0t|||dd} |dkr| d8} | |} t|}tt|D]0} | | | krZ|| || | d || <qZt|}n:d |krd krnnt||| }ntd ||S) a/ Decode data which is flate-encoded. Args: data: flate-encoded data. decode_parms: a dictionary of values, understanding the "/Predictor": key only Returns: The flate-decoded data. Raises: PdfReadError: decodeParms parameters4.0.0z*decode_parms as ArrayObject is depreciatedr z /Predictor z"Unsupported flatedecode predictor )r isinstancerrr-getAttributeError TypeErrorr intLZWCOLUMNS get_objectKeyErrorCOLORSZBITS_PER_COMPONENTmathceil bytearrayr1r2bytesr5_decode_png_predictionr) r!r7r8Zstr_dataZ predictorZDEFAULT_BITS_PER_COMPONENTcolumnscolorsZbits_per_component rowlengthbppr(r%r%r*decodeesZ          zFlateDecode.decode)r!rPrRr"cCst||dkrtdg}d|}|d|}tdt||D]4}t||||}|d}|dkrnn|dkrt|d|D] } || || |d|| <qn|dkrtd|D]} || || d|| <qn~|dkrdtd|dD]$} || d} || | d|| <qt|d|D]6} || |} | || d} || | d|| <q*n|dkrNtd|dD]&} || } | } || | d|| <q|t|d|D]} || |} || } || |}| | |}t|| }t|| }t||}||kr ||kr | } n||kr0| } n|} || | d|| <qntd |t|}||ddq@t|S) NrzImage data is not rectangular)rr r>r=zUnsupported PNG filter )r2rr1listabstupleextendrN)r!rPrRoutputZ prev_rowdatarSrowZrowdataZ filter_byter(floorleftupZpaethZup_leftpZ dist_leftZdist_upZ dist_up_leftr%r%r*rOsb "           z"FlateDecode._decode_png_prediction)r!levelr"cCs t||S)z Compress the input data using zlib. Args: data: The data to be compressed. level: See https://docs.python.org/3/library/zlib.html#zlib.compress Returns: The compressed data. )r,compress)r!rbr%r%r*encodes zFlateDecode.encode)N)ra) __name__ __module__ __qualname__ staticmethodrNrrrrTrErOrdr%r%r%r*r5dsN>r5c@s6eZdZdZedeeefee e edddZ dS)ASCIIHexDecodez The ASCIIHexDecode filter decodes data that has been encoded in ASCII hexadecimal form into a base-7 ASCII format. Nr6cKst|tr|}d}d}d}|t|kr6tdtq|||d}|dkrRqn|rd|d7}q||7}t|dkr|tt|ddf7}d}|d7}q|dksJ|S) a Decode an ASCII-Hex encoded data stream. Args: data: a str sequence of hexadecimal-encoded values to be converted into a base-7 ASCII string decode_parms: a string conversion in base-7 ASCII, where each of its values v is such that 0 <= ord(v) <= 127. Returns: A string conversion in base-7 ASCII, where each of its values v is such that 0 <= ord(v) <= 127. Raises: PdfStreamError: r$rz4missing EOD in ASCIIHexDecode, check if output is OKr >r=)base) rAstrrdr2rreisspacerNrE)r!r7r8retvalZhex_pairindexcharr%r%r*rTs.     zASCIIHexDecode.decode)N rerfrg__doc__rhr rmrNrrrrTr%r%r%r*ris ric@s.eZdZdZedeeeeedddZ dS)RunLengthDecodeuA The RunLengthDecode filter decodes data that has been encoded in a simple byte-oriented format based on run length. The encoded data is a sequence of runs, where each run consists of a length byte followed by 1 to 128 bytes of data. If the length byte is in the range 0 to 127, the following length + 1 (1 to 128) bytes are copied literally during decompression. If length is in the range 129 to 255, the following single byte is to be copied 257 − length (2 to 128) times during decompression. A length value of 128 denotes EOD. Nr6cKsg}d}|t|kr tdtq||}|d7}|dkrR|t|krtdqqq|dkr|d7}|||||||7}qd|}|t||f||d7}qd|S)a Decode a run length encoded data stream. Args: data: a bytes sequence of length/data decode_parms: ignored. Returns: A bytes decompressed sequence. Raises: PdfStreamError: rz5missing EOD in RunLengthDecode, check if output is OKr zearly EOD in RunLengthDecoder$)r2rrerappendrNjoin)r!r7r8lstrplengthr%r%r*rTHs*     zRunLengthDecode.decode)N) rerfrgrsrhrNrrrrTr%r%r%r*rt:s rtc@s<eZdZdZGdddZedeeee e dddZ dS) LZWDecodez Taken from: http://www.java2s.com/Open-Source/Java-Document/PDF/PDF- Renderer/com/sun/pdfview/decode/LZWDecode.java.htm c@sFeZdZeddddZddddZeddd Zedd d Z dS) zLZWDecode.DecoderNr cCsRd|_d|_||_d|_d|_dgd|_tdD]}t||j|<q2|dS)Nrvr>ri) STOP CLEARDICTr!byteposbitposdictr1chr reset_dict)selfr!r(r%r%r*__init__s  zLZWDecode.Decoder.__init__r"cCsd|_d|_dS)N )dictlen bitspercode)rr%r%r*rszLZWDecode.Decoder.reset_dictcCs|j}d}|dkr|jt|jkr&dSt|j|j}d|j}t||}||d|j|?dd|?@||>O}||8}|j|7_|jdkr d|_|jd|_q |S)Nrrar<r )rrr2r!rrmin)rZfillbitsvalueZnextbitsZ bitsfromherer%r%r* next_codes(    zLZWDecode.Decoder.next_codecCs|j}d}|}|}|dkr&td||jkr6qq ||jkrJ|q ||jkrd||j|7}q ||jkr||j|7}|j||j|d}||j|j<|jd7_n:|j||j|d}||7}||j|j<|jd7_|jd|j>dkr |jdkr |jd7_q |S)a TIFF 6.0 specification explains in sufficient details the steps to implement the LZW encode() and decode() algorithms. algorithm derived from: http://www.rasip.fer.hr/research/compress/algorithms/fund/lz/lzw.html and the PDFReference Raises: PdfReadError: If the stop code is missing r|raz"Missed the stop code in LZWDecode!rr )r~rrr}rrrr)rZcWZbaosZpWr`r%r%r*rTs6        zLZWDecode.Decoder.decode) rerfrgrNrrrErrmrTr%r%r%r*Decoders rNr6cKst|S)z Decode an LZW encoded data stream. Args: data: ``bytes`` or ``str`` text to decode. decode_parms: a dictionary of parameter values. Returns: decoded data. )r{rrTr!r7r8r%r%r*rTszLZWDecode.decode)N) rerfrgrsrrhrNrrrrmrTr%r%r%r*r{wsOr{c@s6eZdZdZedeeefee e edddZ dS) ASCII85Decodez7Decodes string ASCII85-encoded data into a byte format.Nr6cKs*t|tr|}|t}t|dtdS)z Decode an Ascii85 encoded data stream. Args: data: ``bytes`` or ``str`` text to decode. decode_parms: a dictionary of parameter values. Returns: decoded data. T)adobe ignorechars)rArmrdstripr rrr%r%r*rTs  zASCII85Decode.decode)Nrrr%r%r%r*rs rc@s*eZdZedeeeeedddZdS) DCTDecodeNr6cKs|SNr%rr%r%r*rTszDCTDecode.decode)N rerfrgrhrNrrrrTr%r%r%r*rsrc@s*eZdZedeeeeedddZdS) JPXDecodeNr6cKs|Srr%rr%r%r*rTszJPXDecode.decode)Nrr%r%r%r*rsrc@s8eZdZdZd eeeddddZeeddd ZdS) CCITParametersu;§7.4.6, optional parameters for the CCITTFaxDecode filter.rN)KrProwsr"cCs.||_d|_d|_d|_||_||_d|_dSr)r EndOfBlockZ EndOfLineZEncodedByteAlignrPrZDamagedRowsBeforeError)rrrPrr%r%r*rszCCITParameters.__init__rcCs|jdkrd}nd}|S)NrrVrU)r)rZ CCITTgroupr%r%r*groups zCCITParameters.group)rrr)rerfrgrsrErpropertyrr%r%r%r*rs rc@sReZdZdZeedeeefe e dddZ ed e e ee ee ddd ZdS) CCITTFaxDecodeu §7.4.6, CCITTFaxDecode filter (ISO 32000). Either Group 3 or Group 4 CCITT facsimile (fax) encoding. CCITT encoding is bit-oriented, not byte-oriented. §7.4.6, optional parameters for the CCITTFaxDecode filter. N)r:rr"cCsd}d}|rttttf|}t|tr`|D],}tj|vrH|tj}tj|vr0|tj}q0n(tj|vrt|tj}tj|vr|tj}t |||S)Nri) r r rrrHrACCITTrGrr)r:rkrPZparameters_unwrappedZ decode_parmr%r%r*_get_parameters3s"        zCCITTFaxDecode._get_parametersr)r!r7heightr8r"c(Ksd|vrtddd|d}t|tr2tdddt||}t|}d}t|dd d d d d d |j dd d |j ddd d ddd |j ddd ddd d t |dd d |j dd d |d&}||S)Nr9r:r;z!decode_parms being an ArrayObjectz3.15.5)Z removed_inz'<2shlhhhllhhllhhllhhllhhllhhllhhllhhllhsII*r<r>rVr rvrrUiiriii) rrArrrrr2structpackrPrrcalcsize)r!r7rr8paramsZimg_sizeZtiff_header_structZ tiff_headerr%r%r*rTMsj   +zCCITTFaxDecode.decode)Nr)rerfrgrsrhr rrrrErrrNrrrTr%r%r%r*r)s  r)streamr"cCs|tjd}t|tr&tt|}t|ts6|f}|tjift |}t|t t fsb|f}t |j }|rt||D]:\}}t|tri}|tjtjfvrt||}q||tjtjfvrt|}q||tjtjfvrt|}q||tjtjfvr t||}q||tjtj fvr(t!|}q||tj"kr@t#|}q||tj$krXt%|}q||tj&kr|t'j(d}t)|||}q||dkrd|vsd|vrt*dq|t*d|q||S)a Decode the stream data based on the specified filters. This function decodes the stream data using the filters provided in the stream. It supports various filter types, including FlateDecode, ASCIIHexDecode, RunLengthDecode, LZWDecode, ASCII85Decode, DCTDecode, JPXDecode, and CCITTFaxDecode. Args: stream: The input stream object containing the data and filters. Returns: The decoded stream data. Raises: NotImplementedError: If an unsupported filter type is encountered. r%z/Cryptz/Namez/Typez3/Crypt filter with /Name or /Type not supported yetzunsupported filter )+rBSAFILTERrArr rrHZ DECODE_PARMSr2rWrYr _dataziprFT FLATE_DECODEFTAZFLr5rTZASCII_HEX_DECODEZAHxriRUN_LENGTH_DECODEZRLrt LZW_DECODErFr{ASCII_85_DECODEZA85r DCT_DECODEr JPX_DECODErCCITT_FAX_DECODEIAHEIGHTrNotImplementedError)rfiltersZ decodparmsr!Z filter_typerrr%r%r*decode_stream_datasJ             rcCstdddt|S)z#Deprecated. Use decode_stream_data.decodeStreamDatarr;)rr)rr%r%r*rs r) x_object_objr"csddlm}m}m}m}m}m}m}t|drB|durB|j }n| }t t |t jt t |t jf} |} t| tr| } t| | d| ddkr| ddkr| dd} |dd} |d t} t| trt| dkr| d} t j|vr|t jtjkrd } |d d d krL||d d d dd\} }n4|| | dkrtt| tstd| vrtdn| d\} }d}d}|tjt}t|tr|dn|}|tjtj fvr|| | | | | |\}}}}nP|tj!tj"tj#fvrX|tj!tj#fvrd}d}nd}d}z|j$t%| dd}Wn |yT|| | | }Yn0n|tj&kr|$t%| dd}}}n|tj'kr|| | | | | \}}}}n|tj#kr|j$t%| dddddf\}}}}n^| dkr|| | | dddf\}}}}n6| dkrt(d|n|| | | dddf\}}}}|t j)|j*dkrZ|tj&tj'fvsl|r|j*dkrdd gt|+ndt| t,r| dd!krdt| t,r| dd"krdd gt|+dur\t-fd#d$t.tDs\g}t.dtdD]8}||d|/fd%d$t.d&Dq|0|}t j1|vrt2|t j1d}|j3|j3krt4d'|t5nN|j*dkr|6d}|j*d(kr|6d }n|j*d)kr|6d}|7|d|vrd*}d+}nd}d}t%}z|j8||d,Wn:t9yV|6d-}d}d}t%}|j8||d,Yn0|:} z|$t%| }Wnt;yd}Yn0|| |fS).a Users need to have the pillow package installed. It's unclear if pypdf will keep this function here, hence it's private. It might get removed at any point. Args: x_object_obj: Returns: Tuple[file extension, bytes, PIL.Image.Image] r )ImageUnidentifiedImageError_extended_image_frombytes_get_imagemode _handle_flate _handle_jpx mode_str_typeindirect_referenceNrrar?z/Colorsz /ColorSpaceRGBz/BitsPerComponentr<bitr|ZGrayr=z.tiffTIFFz.pngPNG)rr)formatsZJPEGz.jpg)rFZCMYKz.tifzColorSpace field not found in Lg?gz/Indexedz /Separationc3s|]}||dkVqdS)r=Nr%r&)rTr%r* `r$z!_xobj_to_image..c3s*|]"}td|dVqdS)go@N)round)r'j)dmaxdminr%r*resr>z"image and mask size not matching: P1z.jp2ZJPEG2000)formatZRGBA)s@  $         8=l  e=