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# Copyright (C) 2001-2006 Python Software Foundation # Author: Barry Warsaw # Contact: email-sig@python.org """Class representing image/* type MIME documents.""" __all__ = ['MIMEImage'] from email import encoders from email.mime.nonmultipart import MIMENonMultipart class MIMEImage(MIMENonMultipart): """Class for generating image/* type MIME documents.""" def __init__(self, _imagedata, _subtype=None, _encoder=encoders.encode_base64, *, policy=None, **_params): """Create an image/* type MIME document. _imagedata contains the bytes for the raw image data. If the data type can be detected (jpeg, png, gif, tiff, rgb, pbm, pgm, ppm, rast, xbm, bmp, webp, and exr attempted), then the subtype will be automatically included in the Content-Type header. Otherwise, you can specify the specific image subtype via the _subtype parameter. _encoder is a function which will perform the actual encoding for transport of the image data. It takes one argument, which is this Image instance. It should use get_payload() and set_payload() to change the payload to the encoded form. It should also add any Content-Transfer-Encoding or other headers to the message as necessary. The default encoding is Base64. Any additional keyword arguments are passed to the base class constructor, which turns them into parameters on the Content-Type header. """ _subtype = _what(_imagedata) if _subtype is None else _subtype if _subtype is None: raise TypeError('Could not guess image MIME subtype') MIMENonMultipart.__init__(self, 'image', _subtype, policy=policy, **_params) self.set_payload(_imagedata) _encoder(self) _rules = [] # Originally from the imghdr module. def _what(data): for rule in _rules: if res := rule(data): return res else: return None def rule(rulefunc): _rules.append(rulefunc) return rulefunc @rule def _jpeg(h): """JPEG data with JFIF or Exif markers; and raw JPEG""" if h[6:10] in (b'JFIF', b'Exif'): return 'jpeg' elif h[:4] == b'\xff\xd8\xff\xdb': return 'jpeg' @rule def _png(h): if h.startswith(b'\211PNG\r\n\032\n'): return 'png' @rule def _gif(h): """GIF ('87 and '89 variants)""" if h[:6] in (b'GIF87a', b'GIF89a'): return 'gif' @rule def _tiff(h): """TIFF (can be in Motorola or Intel byte order)""" if h[:2] in (b'MM', b'II'): return 'tiff' @rule def _rgb(h): """SGI image library""" if h.startswith(b'\001\332'): return 'rgb' @rule def _pbm(h): """PBM (portable bitmap)""" if len(h) >= 3 and \ h[0] == ord(b'P') and h[1] in b'14' and h[2] in b' \t\n\r': return 'pbm' @rule def _pgm(h): """PGM (portable graymap)""" if len(h) >= 3 and \ h[0] == ord(b'P') and h[1] in b'25' and h[2] in b' \t\n\r': return 'pgm' @rule def _ppm(h): """PPM (portable pixmap)""" if len(h) >= 3 and \ h[0] == ord(b'P') and h[1] in b'36' and h[2] in b' \t\n\r': return 'ppm' @rule def _rast(h): """Sun raster file""" if h.startswith(b'\x59\xA6\x6A\x95'): return 'rast' @rule def _xbm(h): """X bitmap (X10 or X11)""" if h.startswith(b'#define '): return 'xbm' @rule def _bmp(h): if h.startswith(b'BM'): return 'bmp' @rule def _webp(h): if h.startswith(b'RIFF') and h[8:12] == b'WEBP': return 'webp' @rule def _exr(h): if h.startswith(b'\x76\x2f\x31\x01'): return 'exr'