| 148 | ## PDFStream type |
| 149 | ## |
| 150 | class PDFStream(PDFObject): |
| 151 | |
| 152 | def __init__(self, attrs, rawdata, decipher=None): |
| 153 | assert isinstance(attrs, dict) |
| 154 | self.attrs = attrs |
| 155 | self.rawdata = rawdata |
| 156 | self.decipher = decipher |
| 157 | self.data = None |
| 158 | self.objid = None |
| 159 | self.genno = None |
| 160 | return |
| 161 | |
| 162 | def set_objid(self, objid, genno): |
| 163 | self.objid = objid |
| 164 | self.genno = genno |
| 165 | return |
| 166 | |
| 167 | def __repr__(self): |
| 168 | if self.data is None: |
| 169 | assert self.rawdata is not None |
| 170 | return '<PDFStream(%r): raw=%d, %r>' % (self.objid, len(self.rawdata), self.attrs) |
| 171 | else: |
| 172 | assert self.data is not None |
| 173 | return '<PDFStream(%r): len=%d, %r>' % (self.objid, len(self.data), self.attrs) |
| 174 | |
| 175 | def __contains__(self, name): |
| 176 | return name in self.attrs |
| 177 | |
| 178 | def __getitem__(self, name): |
| 179 | return self.attrs[name] |
| 180 | |
| 181 | def get(self, name, default=None): |
| 182 | return self.attrs.get(name, default) |
| 183 | |
| 184 | def get_any(self, names, default=None): |
| 185 | for name in names: |
| 186 | if name in self.attrs: |
| 187 | return self.attrs[name] |
| 188 | return default |
| 189 | |
| 190 | def get_filters(self): |
| 191 | filters = self.get_any(('F', 'Filter')) |
| 192 | if not filters: return [] |
| 193 | if isinstance(filters, list): return filters |
| 194 | return [ filters ] |
| 195 | |
| 196 | def decode(self): |
| 197 | assert self.data is None and self.rawdata != None |
| 198 | data = self.rawdata |
| 199 | if self.decipher: |
| 200 | # Handle encryption |
| 201 | data = self.decipher(self.objid, self.genno, data) |
| 202 | filters = self.get_filters() |
| 203 | if not filters: |
| 204 | self.data = data |
| 205 | self.rawdata = None |
| 206 | return |
| 207 | for f in filters: |
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