B 4\U"@sddlmZmZmZddlmZmZddlmZddl m Z m Z ddl m Z Gddde ZGd d d eZGd d d eZGd ddeZddZGdddeZGdddeZGdddeZdS))absolute_importdivisionprint_function) MIME_TYPEPNG_CHUNK_TYPE)InvalidImageStreamError) BIG_ENDIAN StreamReader)BaseImageHeaderc@s4eZdZdZeddZeddZeddZdS) Pngz, Image header parser for PNG images cCstjS)zg MIME content type for this image, unconditionally `image/png` for PNG images. )rZPNG)selfr@/var/www/html/venv/lib/python3.7/site-packages/docx/image/png.py content_typeszPng.content_typecCsdS)zJ Default filename extension, always 'png' for PNG images. Zpngr)r rrr default_extszPng.default_extcCs0t|}|j}|j}|j}|j}|||||S)zi Return a |Png| instance having header properties parsed from image in *stream*. ) _PngParserparsepx_width px_heighthorz_dpivert_dpi)clsstreamparserrrrrrrr from_streams  zPng.from_streamN) __name__ __module__ __qualname____doc__propertyrr classmethodrrrrrr s  r csheZdZdZfddZeddZeddZedd Z ed d Z ed d Z e ddZ ZS)rz\ Parses a PNG image stream to extract the image properties found in its chunks. cstt|||_dS)N)superr__init___chunks)r chunks) __class__rrr#3sz_PngParser.__init__cCst|}||S)z Return a |_PngParser| instance containing the header properties parsed from the PNG image in *stream*. )_Chunksr)rrr%rrrr7s z_PngParser.parsecCs|jj}|jS)z@ The number of pixels in each row of the image. )r$IHDRr)r r(rrrr@sz_PngParser.px_widthcCs|jj}|jS)zD The number of stacked rows of pixels in the image. )r$r(r)r r(rrrrHsz_PngParser.px_heightcCs$|jj}|dkrdS||j|jS)z Integer dots per inch for the width of this image. Defaults to 72 when not present in the file, as is often the case. NH)r$pHYs_dpiunits_specifierhorz_px_per_unit)r r*rrrrPsz_PngParser.horz_dpicCs$|jj}|dkrdS||j|jS)z Integer dots per inch for the height of this image. Defaults to 72 when not present in the file, as is often the case. Nr))r$r*r+r,vert_px_per_unit)r r*rrrr[sz_PngParser.vert_dpicCs |dkr|rtt|dSdS)zi Return dots per inch value calculated from *units_specifier* and *px_per_unit*. rg F%u?r))intround)r,Z px_per_unitrrrr+fs z_PngParser._dpi)rrrrr#r!rr rrrr staticmethodr+ __classcell__rr)r&rr.s    rcsLeZdZdZfddZeddZeddZedd Z d d Z Z S) r'zA Collection of the chunks parsed from a PNG image stream cstt|t||_dS)N)r"r'r#listr$)r Zchunk_iterable)r&rrr#usz_Chunks.__init__cCs$t|}dd|D}||S)zT Return a |_Chunks| instance containing the PNG chunks in *stream*. cSsg|]}|qSrr).0chunkrrr sz'_Chunks.from_stream..) _ChunkParserr iter_chunks)rrZ chunk_parserr%rrrrys z_Chunks.from_streamcCs&dd}||}|dkr"td|S)z) IHDR chunk in PNG image cSs |jtjkS)N) type_namerr()r5rrrz_Chunks.IHDR..Nzno IHDR chunk in PNG image) _find_firstr)r matchr(rrrr(s  z _Chunks.IHDRcCsdd}||S)zC pHYs chunk in PNG image, or |None| if not present cSs |jtjkS)N)r9rr*)r5rrrr:r;z_Chunks.pHYs..)r<)r r=rrrr*sz _Chunks.pHYscCs x|jD]}||r|SqWdS)za Return first chunk in stream order returning True for function *match*. N)r$)r r=r5rrrr<s z_Chunks._find_first) rrrrr#r!rr r(r*r<r2rr)r&rr'qs   r'cs<eZdZdZfddZeddZddZdd ZZ S) r7z1 Extracts chunks from a PNG image stream cstt|||_dS)N)r"r7r# _stream_rdr)r stream_rdr)r&rrr#sz_ChunkParser.__init__cCst|t}||S)zv Return a |_ChunkParser| instance that can extract the chunks from the PNG image in *stream*. )r r )rrr?rrrrs z_ChunkParser.from_streamccs.x(|D]\}}t||j|}|Vq WdS)z Generate a |_Chunk| subclass instance for each chunk in this parser's PNG stream, in the order encountered in the stream. N)_iter_chunk_offsets _ChunkFactoryr>)r chunk_typeoffsetr5rrrr8sz_ChunkParser.iter_chunksccsVd}xL|j|}|jd|d}|d}||fV|dkr>P|d|d7}qWdS)z Generate a (chunk_type, chunk_offset) 2-tuple for each of the chunks in the PNG image stream. Iteration stops after the IEND chunk is returned. ZIENDN)r> read_longZread_str)r Z chunk_offsetZchunk_data_lenrBZ data_offsetrrrr@s  z _ChunkParser._iter_chunk_offsets) rrrrr#r!rr8r@r2rr)r&rr7s    r7cCs*tjttjti}||t}||||S)zs Return a |_Chunk| subclass instance appropriate to *chunk_type* parsed from *stream_rdr* at *offset*. )rr( _IHDRChunkr* _pHYsChunkget_Chunk from_offset)rBr?rCZ chunk_cls_mapZ chunk_clsrrrrAs  rAcs8eZdZdZfddZeddZeddZZ S)rJzY Base class for specific chunk types. Also serves as the default chunk type. cstt|||_dS)N)r"rJr# _chunk_type)r rB)r&rrr#sz_Chunk.__init__cCs||S)zR Return a default _Chunk instance that only knows its chunk type. r)rrBr?rCrrrrKsz_Chunk.from_offsetcCs|jS)z@ The chunk type name, e.g. 'IHDR', 'pHYs', etc. )rL)r rrrr9sz_Chunk.type_name) rrrrr#r!rKr r9r2rr)r&rrJs  rJcsDeZdZdZfddZeddZeddZedd Z Z S) rGz3 IHDR chunk, contains the image dimensions cs tt||||_||_dS)N)r"rGr# _px_width _px_height)r rBrr)r&rrr#sz_IHDRChunk.__init__cCs"||}||d}||||S)z Return an _IHDRChunk instance containing the image dimensions extracted from the IHDR chunk in *stream* at *offset*. rE)rF)rrBr?rCrrrrrrKs  z_IHDRChunk.from_offsetcCs|jS)N)rM)r rrrrsz_IHDRChunk.px_widthcCs|jS)N)rN)r rrrrsz_IHDRChunk.px_height) rrrrr#r!rKr rrr2rr)r&rrGs   rGcsPeZdZdZfddZeddZeddZedd Z ed d Z Z S) rHz8 pYHs chunk, contains the image dpi information cs&tt||||_||_||_dS)N)r"rHr#_horz_px_per_unit_vert_px_per_unit_units_specifier)r rBr-r.r,)r&rrr#sz_pHYsChunk.__init__cCs0||}||d}||d}|||||S)z Return a _pHYsChunk instance containing the image resolution extracted from the pHYs chunk in *stream* at *offset*. rErD)rFZ read_byte)rrBr?rCr-r.r,rrrrKs    z_pHYsChunk.from_offsetcCs|jS)N)rO)r rrrr-%sz_pHYsChunk.horz_px_per_unitcCs|jS)N)rP)r rrrr.)sz_pHYsChunk.vert_px_per_unitcCs|jS)N)rQ)r rrrr,-sz_pHYsChunk.units_specifier) rrrrr#r!rKr r-r.r,r2rr)r&rrH s    rHN) __future__rrr constantsrr exceptionsrZhelpersr r imager r objectrr'r7rArJrGrHrrrrs  #C/,