o W_+@sddlmZmZmZddlmZmZmZddlm Z m Z m Z ddl m Z Gddde ZGdd d eZGd d d eZGd d d eZddZGdddeZGdddeZGdddeZGdddeZGdddeZdS))absolute_importdivisionprint_function) MIME_TYPETIFF_FLDTIFF_TAG) BIG_ENDIAN LITTLE_ENDIAN StreamReader)BaseImageHeaderc@s4eZdZdZeddZeddZeddZdS) Tiffzd Image header parser for TIFF images. Handles both big and little endian byte ordering. cCstjS)zm Return the MIME type of this TIFF image, unconditionally the string ``image/tiff``. )rZTIFFselfr?D:\Projects\ConvertPro\env\Lib\site-packages\docx\image\tiff.py content_typeszTiff.content_typecCdS)zL Default filename extension, always 'tiff' for TIFF images. Ztiffrrrrr default_extszTiff.default_extcCs0t|}|j}|j}|j}|j}|||||S)zk Return a |Tiff| instance containing the properties of the TIFF image in *stream*. ) _TiffParserparsepx_width px_heighthorz_dpivert_dpi)clsstreamparserrrrrrrr from_streams zTiff.from_streamN) __name__ __module__ __qualname____doc__propertyrr classmethodrrrrrr s  r cs|eZdZdZfddZeddZeddZedd Z ed d Z ed d Z eddZ ddZ eddZZS)rzu Parses a TIFF image stream to extract the image properties found in its main image file directory (IFD) ctt|||_dSN)superr__init__ _ifd_entries)r ifd_entries __class__rrr(3 z_TiffParser.__init__cCs(||}|d}t||}||S)z Return an instance of |_TiffParser| containing the properties parsed from the TIFF image in *stream*. )_make_stream_reader read_long _IfdEntriesr)rr stream_rdrZ ifd0_offsetr*rrrr7s   z_TiffParser.parsecC |tjS)z The horizontal dots per inch value calculated from the XResolution and ResolutionUnit tags of the IFD; defaults to 72 if those tags are not present. )_dpirZ X_RESOLUTIONrrrrrB z_TiffParser.horz_dpicCr3)z The vertical dots per inch value calculated from the XResolution and ResolutionUnit tags of the IFD; defaults to 72 if those tags are not present. )r4rZ Y_RESOLUTIONrrrrrKr5z_TiffParser.vert_dpicC|jtjS)z The number of stacked rows of pixels in the image, |None| if the IFD contains no ``ImageLength`` tag, the expected case when the TIFF is embeded in an Exif image. )r)getrZ IMAGE_LENGTHrrrrrTz_TiffParser.px_heightcCr6)z The number of pixels in each row in the image, |None| if the IFD contains no ``ImageWidth`` tag, the expected case when the TIFF is embeded in an Exif image. )r)r7rZ IMAGE_WIDTHrrrrr]r8z_TiffParser.px_widthcCs$|d|d}|dkrtStS)z Return either BIG_ENDIAN or LITTLE_ENDIAN depending on the endian indicator found in the TIFF *stream* header, either 'MM' or 'II'. rsMM)seekreadr r )rrZ endian_strrrr_detect_endianfs  z_TiffParser._detect_endiancCs^|j}||vr dStj|vr|tjnd}|dkrdS|dkr!dnd}||}tt||S)a) Return the dpi value calculated for *resolution_tag*, which can be either TIFF_TAG.X_RESOLUTION or TIFF_TAG.Y_RESOLUTION. The calculation is based on the values of both that tag and the TIFF_TAG.RESOLUTION_UNIT tag in this parser's |_IfdEntries| instance. Hr9rgRQ@)r)rZRESOLUTION_UNITintround)rZresolution_tagr*Zresolution_unitZunits_per_inchZ dots_per_unitrrrr4ps  z_TiffParser._dpicCs||}t||S)z Return a |StreamReader| instance with wrapping *stream* and having "endian-ness" determined by the 'MM' or 'II' indicator in the TIFF stream header. )r<r )rrZendianrrrr/s  z_TiffParser._make_stream_reader)rr r!r"r(r$rr#rrrrr<r4r/ __classcell__rrr+rr.s$        rcsFeZdZdZfddZddZddZedd Zd d d Z Z S)r1z Image File Directory for a TIFF image, having mapping (dict) semantics allowing "tag" values to be retrieved by tag code. cr%r&)r'r1r(_entries)rentriesr+rrr(r-z_IfdEntries.__init__cC |j|S)zG Provides ``in`` operator, e.g. ``tag in ifd_entries`` )rA __contains__rkeyrrrrD z_IfdEntries.__contains__cCrC)zU Provides indexed access, e.g. ``tag_value = ifd_entries[tag_code]`` )rA __getitem__rErrrrHrGz_IfdEntries.__getitem__cCs(t||}tdd|D}||S)zh Return a new |_IfdEntries| instance parsed from *stream* starting at *offset*. css|] }|j|jfVqdSr&)tagvalue).0errr sz*_IfdEntries.from_stream..) _IfdParserdict iter_entries)rroffsetZ ifd_parserrBrrrrs z_IfdEntries.from_streamNcCs|j||S)zz Return value of IFD entry having tag matching *tag_code*, or *default* if no matching tag found. )rAr7)rtag_codedefaultrrrr7z_IfdEntries.getr&) rr r!r"r(rDrHr$rr7r@rrr+rr1s   r1cs4eZdZdZfddZddZeddZZS)rNzk Service object that knows how to extract directory entries from an Image File Directory (IFD) ctt|||_||_dSr&)r'rNr( _stream_rdr_offset)rr2rQr+rrr( z_IfdParser.__init__ccs:t|jD]}|jd|d}t|j|}|VqdS)zh Generate an |_IfdEntry| instance corresponding to each entry in the directory. r9 N)range _entry_countrW_IfdEntryFactoryrV)ridxZdir_entry_offsetZ ifd_entryrrrrPs  z_IfdParser.iter_entriescCs|j|jS)zU The count of directory entries, read from the top of the IFD header )rV read_shortrWrrrrr[rTz_IfdParser._entry_count) rr r!r"r(rPr#r[r@rrr+rrNs   rNcCsJtjttjttjttjti}| |d}||vr||}nt }| ||S)z~ Return an |_IfdEntry| subclass instance containing the value of the directory entry at *offset* in *stream_rdr*. r9) rASCII_AsciiIfdEntryZSHORT_ShortIfdEntryZLONG _LongIfdEntryZRATIONAL_RationalIfdEntryr^ _IfdEntryr)r2rQZifd_entry_classesZ field_typeZ entry_clsrrrr\s   r\csPeZdZdZfddZeddZeddZedd Z ed d Z Z S) rdzw Base class for IFD entry classes. Subclasses are differentiated by value type, e.g. ASCII, long int, etc. crUr&)r'rdr( _tag_code_value)rrRrJr+rrr(rXz_IfdEntry.__init__cCs>||d}||d}||d}|||||}|||S)a) Return an |_IfdEntry| subclass instance containing the tag and value of the tag parsed from *stream_rdr* at *offset*. Note this method is common to all subclasses. Override the ``_parse_value()`` method to provide distinctive behavior based on field type. rr.)r^r0 _parse_value)rr2rQrR value_count value_offsetrJrrrrs    z_IfdEntry.from_streamcCr)z Return the value of this field parsed from *stream_rdr* at *offset*. Intended to be overridden by subclasses. zUNIMPLEMENTED FIELD TYPErrr2rQrirjrrrrhsz_IfdEntry._parse_valuecC|jS)z? Short int code that identifies this IFD entry )rerrrrrI z _IfdEntry.tagcCrl)zI Value of this tag, its type being dependent on the tag. )rfrrrrrJrmz_IfdEntry.value) rr r!r"r(r$rrhr#rIrJr@rrr+rrds    rdc@eZdZdZeddZdS)r`zE IFD entry having the form of a NULL-terminated ASCII string cCs||d|S)z Return the ASCII string parsed from *stream_rdr* at *value_offset*. The length of the string, including a terminating '' (NUL) character, is in *value_count*. r)Zread_strrkrrrrhsz_AsciiIfdEntry._parse_valueNrr r!r"r$rhrrrrr`r`c@rn)raz9 IFD entry expressed as a short (2-byte) integer cC|dkr ||dSdS)z Return the short int value contained in the *value_offset* field of this entry. Only supports single values at present. rrgz)Multi-value short integer NOT IMPLEMENTED)r^rkrrrrh- z_ShortIfdEntry._parse_valueNrorrrrra)rprac@rn)rbz8 IFD entry expressed as a long (4-byte) integer cCrq)z Return the long int value contained in the *value_offset* field of this entry. Only supports single values at present. rrgz(Multi-value long integer NOT IMPLEMENTEDr0rkrrrrh=rrz_LongIfdEntry._parse_valueNrorrrrrb9rprbc@rn)rcz> IFD entry expressed as a numerator, denominator pair cCs*|dkr||}||d}||SdS)z Return the rational (numerator / denominator) value at *value_offset* in *stream_rdr* as a floating-point number. Only supports single values at present. rr.z$Multi-value Rational NOT IMPLEMENTEDrs)rr2rQrirj numerator denominatorrrrrhMs   z_RationalIfdEntry._parse_valueNrorrrrrcIrprcN)Z __future__rrr constantsrrrhelpersr r r imager r objectrr1rNr\rdr`rarbrcrrrrs $f'1