paul@0 | 1 | #!/usr/bin/env python |
paul@0 | 2 | |
paul@0 | 3 | """ |
paul@0 | 4 | Java class file decoder. Specification found at the following URL: |
paul@0 | 5 | http://java.sun.com/docs/books/vmspec/2nd-edition/html/ClassFile.doc.html |
paul@0 | 6 | """ |
paul@0 | 7 | |
paul@4 | 8 | import struct # for general decoding of class files |
paul@0 | 9 | |
paul@1 | 10 | # Utility functions. |
paul@1 | 11 | |
paul@1 | 12 | def u1(data): |
paul@1 | 13 | return struct.unpack(">B", data[0:1])[0] |
paul@1 | 14 | |
paul@1 | 15 | def u2(data): |
paul@1 | 16 | return struct.unpack(">H", data[0:2])[0] |
paul@1 | 17 | |
paul@1 | 18 | def u4(data): |
paul@1 | 19 | return struct.unpack(">L", data[0:4])[0] |
paul@1 | 20 | |
paul@4 | 21 | def s4(data): |
paul@4 | 22 | return struct.unpack(">l", data[0:4])[0] |
paul@4 | 23 | |
paul@4 | 24 | def s8(data): |
paul@4 | 25 | return struct.unpack(">q", data[0:8])[0] |
paul@4 | 26 | |
paul@4 | 27 | def f4(data): |
paul@4 | 28 | return struct.unpack(">f", data[0:4])[0] |
paul@4 | 29 | |
paul@4 | 30 | def f8(data): |
paul@4 | 31 | return struct.unpack(">d", data[0:8])[0] |
paul@4 | 32 | |
paul@2 | 33 | # Useful mix-ins. |
paul@2 | 34 | |
paul@12 | 35 | class PythonNameUtils: |
paul@12 | 36 | def get_python_name(self): |
paul@12 | 37 | name = self.get_name() |
paul@12 | 38 | if str(name) == "<init>": |
paul@14 | 39 | return "__java_init__" |
paul@12 | 40 | else: |
paul@12 | 41 | return name |
paul@12 | 42 | |
paul@12 | 43 | class NameUtils(PythonNameUtils): |
paul@2 | 44 | def get_name(self): |
paul@2 | 45 | if self.name_index != 0: |
paul@10 | 46 | return self.class_file.constants[self.name_index - 1] |
paul@2 | 47 | else: |
paul@2 | 48 | # Some name indexes are zero to indicate special conditions. |
paul@2 | 49 | return None |
paul@2 | 50 | |
paul@12 | 51 | class NameAndTypeUtils(PythonNameUtils): |
paul@7 | 52 | def get_name(self): |
paul@7 | 53 | if self.name_and_type_index != 0: |
paul@7 | 54 | return self.class_file.constants[self.name_and_type_index - 1].get_name() |
paul@7 | 55 | else: |
paul@7 | 56 | # Some name indexes are zero to indicate special conditions. |
paul@7 | 57 | return None |
paul@7 | 58 | |
paul@7 | 59 | def get_field_descriptor(self): |
paul@7 | 60 | if self.name_and_type_index != 0: |
paul@7 | 61 | return self.class_file.constants[self.name_and_type_index - 1].get_field_descriptor() |
paul@7 | 62 | else: |
paul@7 | 63 | # Some name indexes are zero to indicate special conditions. |
paul@7 | 64 | return None |
paul@7 | 65 | |
paul@7 | 66 | def get_method_descriptor(self): |
paul@7 | 67 | if self.name_and_type_index != 0: |
paul@7 | 68 | return self.class_file.constants[self.name_and_type_index - 1].get_method_descriptor() |
paul@7 | 69 | else: |
paul@7 | 70 | # Some name indexes are zero to indicate special conditions. |
paul@7 | 71 | return None |
paul@7 | 72 | |
paul@7 | 73 | class DescriptorUtils: |
paul@7 | 74 | |
paul@7 | 75 | "Symbol parsing." |
paul@7 | 76 | |
paul@7 | 77 | def _get_method_descriptor(self, s): |
paul@7 | 78 | assert s[0] == "(" |
paul@7 | 79 | params = [] |
paul@7 | 80 | s = s[1:] |
paul@7 | 81 | while s[0] != ")": |
paul@7 | 82 | parameter_descriptor, s = self._get_parameter_descriptor(s) |
paul@7 | 83 | params.append(parameter_descriptor) |
paul@7 | 84 | if s[1] != "V": |
paul@7 | 85 | return_type, s = self._get_field_type(s[1:]) |
paul@7 | 86 | else: |
paul@7 | 87 | return_type, s = None, s[1:] |
paul@7 | 88 | return params, return_type |
paul@7 | 89 | |
paul@7 | 90 | def _get_parameter_descriptor(self, s): |
paul@7 | 91 | return self._get_field_type(s) |
paul@7 | 92 | |
paul@7 | 93 | def _get_field_descriptor(self, s): |
paul@7 | 94 | return self._get_field_type(s) |
paul@7 | 95 | |
paul@7 | 96 | def _get_component_type(self, s): |
paul@7 | 97 | return self._get_field_type(s) |
paul@7 | 98 | |
paul@7 | 99 | def _get_field_type(self, s): |
paul@7 | 100 | base_type, s = self._get_base_type(s) |
paul@7 | 101 | object_type = None |
paul@7 | 102 | array_type = None |
paul@7 | 103 | if base_type == "L": |
paul@7 | 104 | object_type, s = self._get_object_type(s) |
paul@7 | 105 | elif base_type == "[": |
paul@7 | 106 | array_type, s = self._get_array_type(s) |
paul@7 | 107 | return (base_type, object_type, array_type), s |
paul@7 | 108 | |
paul@7 | 109 | def _get_base_type(self, s): |
paul@7 | 110 | if len(s) > 0: |
paul@7 | 111 | return s[0], s[1:] |
paul@7 | 112 | else: |
paul@7 | 113 | return None, s |
paul@7 | 114 | |
paul@7 | 115 | def _get_object_type(self, s): |
paul@7 | 116 | if len(s) > 0: |
paul@7 | 117 | s_end = s.find(";") |
paul@7 | 118 | assert s_end != -1 |
paul@7 | 119 | return s[:s_end], s[s_end+1:] |
paul@7 | 120 | else: |
paul@7 | 121 | return None, s |
paul@7 | 122 | |
paul@7 | 123 | def _get_array_type(self, s): |
paul@7 | 124 | if len(s) > 0: |
paul@7 | 125 | return self._get_component_type(s) |
paul@7 | 126 | else: |
paul@7 | 127 | return None, s |
paul@7 | 128 | |
paul@0 | 129 | # Constant information. |
paul@1 | 130 | # Objects of these classes are not directly aware of the class they reside in. |
paul@0 | 131 | |
paul@2 | 132 | class ClassInfo(NameUtils): |
paul@2 | 133 | def init(self, data, class_file): |
paul@2 | 134 | self.class_file = class_file |
paul@1 | 135 | self.name_index = u2(data[0:2]) |
paul@0 | 136 | return data[2:] |
paul@0 | 137 | |
paul@7 | 138 | class RefInfo(NameAndTypeUtils): |
paul@2 | 139 | def init(self, data, class_file): |
paul@2 | 140 | self.class_file = class_file |
paul@1 | 141 | self.class_index = u2(data[0:2]) |
paul@1 | 142 | self.name_and_type_index = u2(data[2:4]) |
paul@0 | 143 | return data[4:] |
paul@0 | 144 | |
paul@0 | 145 | class FieldRefInfo(RefInfo): |
paul@7 | 146 | def get_descriptor(self): |
paul@7 | 147 | return RefInfo.get_field_descriptor(self) |
paul@0 | 148 | |
paul@0 | 149 | class MethodRefInfo(RefInfo): |
paul@7 | 150 | def get_descriptor(self): |
paul@7 | 151 | return RefInfo.get_method_descriptor(self) |
paul@0 | 152 | |
paul@0 | 153 | class InterfaceMethodRefInfo(RefInfo): |
paul@7 | 154 | def get_descriptor(self): |
paul@7 | 155 | return RefInfo.get_method_descriptor(self) |
paul@0 | 156 | |
paul@7 | 157 | class NameAndTypeInfo(NameUtils, DescriptorUtils): |
paul@2 | 158 | def init(self, data, class_file): |
paul@2 | 159 | self.class_file = class_file |
paul@1 | 160 | self.name_index = u2(data[0:2]) |
paul@1 | 161 | self.descriptor_index = u2(data[2:4]) |
paul@0 | 162 | return data[4:] |
paul@0 | 163 | |
paul@7 | 164 | def get_field_descriptor(self): |
paul@7 | 165 | return self._get_field_descriptor(unicode(self.class_file.constants[self.descriptor_index - 1])) |
paul@7 | 166 | |
paul@7 | 167 | def get_method_descriptor(self): |
paul@7 | 168 | return self._get_method_descriptor(unicode(self.class_file.constants[self.descriptor_index - 1])) |
paul@7 | 169 | |
paul@0 | 170 | class Utf8Info: |
paul@2 | 171 | def init(self, data, class_file): |
paul@2 | 172 | self.class_file = class_file |
paul@1 | 173 | self.length = u2(data[0:2]) |
paul@0 | 174 | self.bytes = data[2:2+self.length] |
paul@0 | 175 | return data[2+self.length:] |
paul@0 | 176 | |
paul@0 | 177 | def __str__(self): |
paul@0 | 178 | return self.bytes |
paul@0 | 179 | |
paul@0 | 180 | def __unicode__(self): |
paul@0 | 181 | return unicode(self.bytes, "utf-8") |
paul@0 | 182 | |
paul@0 | 183 | class StringInfo: |
paul@2 | 184 | def init(self, data, class_file): |
paul@2 | 185 | self.class_file = class_file |
paul@1 | 186 | self.string_index = u2(data[0:2]) |
paul@0 | 187 | return data[2:] |
paul@0 | 188 | |
paul@0 | 189 | class SmallNumInfo: |
paul@2 | 190 | def init(self, data, class_file): |
paul@2 | 191 | self.class_file = class_file |
paul@4 | 192 | self.bytes = data[0:4] |
paul@0 | 193 | return data[4:] |
paul@0 | 194 | |
paul@0 | 195 | class IntegerInfo(SmallNumInfo): |
paul@4 | 196 | def get_value(self): |
paul@4 | 197 | return s4(self.bytes) |
paul@0 | 198 | |
paul@0 | 199 | class FloatInfo(SmallNumInfo): |
paul@4 | 200 | def get_value(self): |
paul@4 | 201 | return f4(self.bytes) |
paul@0 | 202 | |
paul@0 | 203 | class LargeNumInfo: |
paul@2 | 204 | def init(self, data, class_file): |
paul@2 | 205 | self.class_file = class_file |
paul@1 | 206 | self.high_bytes = u4(data[0:4]) |
paul@1 | 207 | self.low_bytes = u4(data[4:8]) |
paul@0 | 208 | return data[8:] |
paul@0 | 209 | |
paul@0 | 210 | class LongInfo(LargeNumInfo): |
paul@4 | 211 | def get_value(self): |
paul@4 | 212 | return s8(self.high_bytes + self.low_bytes) |
paul@0 | 213 | |
paul@0 | 214 | class DoubleInfo(LargeNumInfo): |
paul@4 | 215 | def get_value(self): |
paul@4 | 216 | return f8(self.high_bytes + self.low_bytes) |
paul@0 | 217 | |
paul@0 | 218 | # Other information. |
paul@1 | 219 | # Objects of these classes are generally aware of the class they reside in. |
paul@0 | 220 | |
paul@7 | 221 | class ItemInfo(NameUtils, DescriptorUtils): |
paul@0 | 222 | def init(self, data, class_file): |
paul@0 | 223 | self.class_file = class_file |
paul@1 | 224 | self.access_flags = u2(data[0:2]) |
paul@1 | 225 | self.name_index = u2(data[2:4]) |
paul@1 | 226 | self.descriptor_index = u2(data[4:6]) |
paul@0 | 227 | self.attributes, data = self.class_file._get_attributes(data[6:]) |
paul@0 | 228 | return data |
paul@0 | 229 | |
paul@0 | 230 | class FieldInfo(ItemInfo): |
paul@0 | 231 | def get_descriptor(self): |
paul@0 | 232 | return self._get_field_descriptor(unicode(self.class_file.constants[self.descriptor_index - 1])) |
paul@0 | 233 | |
paul@0 | 234 | class MethodInfo(ItemInfo): |
paul@0 | 235 | def get_descriptor(self): |
paul@0 | 236 | return self._get_method_descriptor(unicode(self.class_file.constants[self.descriptor_index - 1])) |
paul@0 | 237 | |
paul@0 | 238 | class AttributeInfo: |
paul@0 | 239 | def init(self, data, class_file): |
paul@1 | 240 | self.attribute_length = u4(data[0:4]) |
paul@0 | 241 | self.info = data[4:4+self.attribute_length] |
paul@0 | 242 | return data[4+self.attribute_length:] |
paul@0 | 243 | |
paul@0 | 244 | # NOTE: Decode the different attribute formats. |
paul@0 | 245 | |
paul@2 | 246 | class SourceFileAttributeInfo(AttributeInfo, NameUtils): |
paul@2 | 247 | def init(self, data, class_file): |
paul@2 | 248 | self.class_file = class_file |
paul@2 | 249 | self.attribute_length = u4(data[0:4]) |
paul@2 | 250 | # Permit the NameUtils mix-in. |
paul@2 | 251 | self.name_index = self.sourcefile_index = u2(data[4:6]) |
paul@0 | 252 | |
paul@0 | 253 | class ConstantValueAttributeInfo(AttributeInfo): |
paul@0 | 254 | def init(self, data, class_file): |
paul@4 | 255 | self.class_file = class_file |
paul@1 | 256 | self.attribute_length = u4(data[0:4]) |
paul@1 | 257 | self.constant_value_index = u2(data[4:6]) |
paul@0 | 258 | assert 4+self.attribute_length == 6 |
paul@0 | 259 | return data[4+self.attribute_length:] |
paul@0 | 260 | |
paul@4 | 261 | def get_value(self): |
paul@4 | 262 | return self.class_file.constants[self.constant_value_index - 1].get_value() |
paul@4 | 263 | |
paul@0 | 264 | class CodeAttributeInfo(AttributeInfo): |
paul@0 | 265 | def init(self, data, class_file): |
paul@0 | 266 | self.class_file = class_file |
paul@1 | 267 | self.attribute_length = u4(data[0:4]) |
paul@1 | 268 | self.max_stack = u2(data[4:6]) |
paul@1 | 269 | self.max_locals = u2(data[6:8]) |
paul@1 | 270 | self.code_length = u4(data[8:12]) |
paul@0 | 271 | end_of_code = 12+self.code_length |
paul@0 | 272 | self.code = data[12:end_of_code] |
paul@1 | 273 | self.exception_table_length = u2(data[end_of_code:end_of_code+2]) |
paul@0 | 274 | self.exception_table = [] |
paul@0 | 275 | data = data[end_of_code + 2:] |
paul@0 | 276 | for i in range(0, self.exception_table_length): |
paul@0 | 277 | exception = ExceptionInfo() |
paul@0 | 278 | data = exception.init(data) |
paul@2 | 279 | self.exception_table.append(exception) |
paul@0 | 280 | self.attributes, data = self.class_file._get_attributes(data) |
paul@0 | 281 | return data |
paul@0 | 282 | |
paul@0 | 283 | class ExceptionsAttributeInfo(AttributeInfo): |
paul@1 | 284 | def init(self, data, class_file): |
paul@1 | 285 | self.class_file = class_file |
paul@1 | 286 | self.attribute_length = u4(data[0:4]) |
paul@1 | 287 | self.number_of_exceptions = u2(data[4:6]) |
paul@1 | 288 | self.exception_index_table = [] |
paul@1 | 289 | index = 6 |
paul@1 | 290 | for i in range(0, self.number_of_exceptions): |
paul@1 | 291 | self.exception_index_table.append(u2(data[index:index+2])) |
paul@1 | 292 | index += 2 |
paul@1 | 293 | return data[index:] |
paul@1 | 294 | |
paul@1 | 295 | def get_exception(self, i): |
paul@1 | 296 | exception_index = self.exception_index_table[i] |
paul@1 | 297 | return self.class_file.constants[exception_index - 1] |
paul@0 | 298 | |
paul@0 | 299 | class InnerClassesAttributeInfo(AttributeInfo): |
paul@2 | 300 | def init(self, data, class_file): |
paul@2 | 301 | self.class_file = class_file |
paul@2 | 302 | self.attribute_length = u4(data[0:4]) |
paul@2 | 303 | self.number_of_classes = u2(data[4:6]) |
paul@2 | 304 | self.classes = [] |
paul@2 | 305 | data = data[6:] |
paul@2 | 306 | for i in range(0, self.number_of_classes): |
paul@2 | 307 | inner_class = InnerClassInfo() |
paul@2 | 308 | data = inner_class.init(data, self.class_file) |
paul@2 | 309 | self.classes.append(inner_class) |
paul@2 | 310 | return data |
paul@0 | 311 | |
paul@0 | 312 | class SyntheticAttributeInfo(AttributeInfo): |
paul@0 | 313 | pass |
paul@0 | 314 | |
paul@0 | 315 | class LineNumberAttributeInfo(AttributeInfo): |
paul@2 | 316 | def init(self, data, class_file): |
paul@2 | 317 | self.class_file = class_file |
paul@2 | 318 | self.attribute_length = u4(data[0:4]) |
paul@2 | 319 | self.line_number_table_length = u2(data[4:6]) |
paul@2 | 320 | self.line_number_table = [] |
paul@2 | 321 | data = data[6:] |
paul@2 | 322 | for i in range(0, self.line_number_table_length): |
paul@2 | 323 | line_number = LineNumberInfo() |
paul@2 | 324 | data = line_number.init(data) |
paul@2 | 325 | self.line_number_table.append(line_number) |
paul@2 | 326 | return data |
paul@0 | 327 | |
paul@0 | 328 | class LocalVariableAttributeInfo(AttributeInfo): |
paul@2 | 329 | def init(self, data, class_file): |
paul@2 | 330 | self.class_file = class_file |
paul@2 | 331 | self.attribute_length = u4(data[0:4]) |
paul@2 | 332 | self.local_variable_table_length = u2(data[4:6]) |
paul@2 | 333 | self.local_variable_table = [] |
paul@2 | 334 | data = data[6:] |
paul@2 | 335 | for i in range(0, self.local_variable_table_length): |
paul@2 | 336 | local_variable = LocalVariableInfo() |
paul@2 | 337 | data = local_variable.init(data) |
paul@2 | 338 | self.local_variable_table.append(local_variable) |
paul@2 | 339 | return data |
paul@0 | 340 | |
paul@0 | 341 | class DeprecatedAttributeInfo(AttributeInfo): |
paul@0 | 342 | pass |
paul@0 | 343 | |
paul@2 | 344 | # Child classes of the attribute information classes. |
paul@2 | 345 | |
paul@0 | 346 | class ExceptionInfo: |
paul@0 | 347 | def init(self, data): |
paul@1 | 348 | self.start_pc = u2(data[0:2]) |
paul@1 | 349 | self.end_pc = u2(data[2:4]) |
paul@1 | 350 | self.handler_pc = u2(data[4:6]) |
paul@1 | 351 | self.catch_type = u2(data[6:8]) |
paul@0 | 352 | return data[8:] |
paul@0 | 353 | |
paul@2 | 354 | class InnerClassInfo(NameUtils): |
paul@2 | 355 | def init(self, data, class_file): |
paul@2 | 356 | self.class_file = class_file |
paul@2 | 357 | self.inner_class_info_index = u2(data[0:2]) |
paul@2 | 358 | self.outer_class_info_index = u2(data[2:4]) |
paul@2 | 359 | # Permit the NameUtils mix-in. |
paul@2 | 360 | self.name_index = self.inner_name_index = u2(data[4:6]) |
paul@2 | 361 | self.inner_class_access_flags = u2(data[6:8]) |
paul@2 | 362 | return data[8:] |
paul@2 | 363 | |
paul@2 | 364 | class LineNumberInfo: |
paul@2 | 365 | def init(self, data): |
paul@2 | 366 | self.start_pc = u2(data[0:2]) |
paul@2 | 367 | self.line_number = u2(data[2:4]) |
paul@2 | 368 | return data[4:] |
paul@2 | 369 | |
paul@2 | 370 | class LocalVariableInfo(NameUtils): |
paul@2 | 371 | def init(self, data, class_file): |
paul@2 | 372 | self.class_file = class_file |
paul@2 | 373 | self.start_pc = u2(data[0:2]) |
paul@2 | 374 | self.length = u2(data[2:4]) |
paul@2 | 375 | self.name_index = u2(data[4:6]) |
paul@2 | 376 | self.descriptor_index = u2(data[6:8]) |
paul@2 | 377 | self.index = u2(data[8:10]) |
paul@2 | 378 | return data[10:] |
paul@2 | 379 | |
paul@2 | 380 | def get_descriptor(self): |
paul@2 | 381 | return self._get_field_descriptor(unicode(self.class_file.constants[self.descriptor_index - 1])) |
paul@2 | 382 | |
paul@2 | 383 | # Exceptions. |
paul@2 | 384 | |
paul@0 | 385 | class UnknownTag(Exception): |
paul@0 | 386 | pass |
paul@0 | 387 | |
paul@0 | 388 | class UnknownAttribute(Exception): |
paul@0 | 389 | pass |
paul@0 | 390 | |
paul@0 | 391 | # Abstractions for the main structures. |
paul@0 | 392 | |
paul@0 | 393 | class ClassFile: |
paul@0 | 394 | |
paul@0 | 395 | "A class representing a Java class file." |
paul@0 | 396 | |
paul@0 | 397 | def __init__(self, s): |
paul@0 | 398 | |
paul@0 | 399 | """ |
paul@0 | 400 | Process the given string 's', populating the object with the class |
paul@0 | 401 | file's details. |
paul@0 | 402 | """ |
paul@0 | 403 | |
paul@0 | 404 | self.constants, s = self._get_constants(s[8:]) |
paul@0 | 405 | self.access_flags, s = self._get_access_flags(s) |
paul@0 | 406 | self.this_class, s = self._get_this_class(s) |
paul@0 | 407 | self.super_class, s = self._get_super_class(s) |
paul@0 | 408 | self.interfaces, s = self._get_interfaces(s) |
paul@0 | 409 | self.fields, s = self._get_fields(s) |
paul@0 | 410 | self.methods, s = self._get_methods(s) |
paul@0 | 411 | self.attributes, s = self._get_attributes(s) |
paul@0 | 412 | |
paul@0 | 413 | def _decode_const(self, s): |
paul@1 | 414 | tag = u1(s[0:1]) |
paul@0 | 415 | if tag == 1: |
paul@0 | 416 | const = Utf8Info() |
paul@0 | 417 | elif tag == 3: |
paul@0 | 418 | const = IntegerInfo() |
paul@0 | 419 | elif tag == 4: |
paul@0 | 420 | const = FloatInfo() |
paul@0 | 421 | elif tag == 5: |
paul@0 | 422 | const = LongInfo() |
paul@0 | 423 | elif tag == 6: |
paul@0 | 424 | const = DoubleInfo() |
paul@0 | 425 | elif tag == 7: |
paul@0 | 426 | const = ClassInfo() |
paul@0 | 427 | elif tag == 8: |
paul@0 | 428 | const = StringInfo() |
paul@0 | 429 | elif tag == 9: |
paul@0 | 430 | const = FieldRefInfo() |
paul@0 | 431 | elif tag == 10: |
paul@0 | 432 | const = MethodRefInfo() |
paul@0 | 433 | elif tag == 11: |
paul@0 | 434 | const = InterfaceMethodRefInfo() |
paul@0 | 435 | elif tag == 12: |
paul@0 | 436 | const = NameAndTypeInfo() |
paul@0 | 437 | else: |
paul@0 | 438 | raise UnknownTag, tag |
paul@2 | 439 | |
paul@2 | 440 | # Initialise the constant object. |
paul@2 | 441 | |
paul@2 | 442 | s = const.init(s[1:], self) |
paul@0 | 443 | return const, s |
paul@0 | 444 | |
paul@0 | 445 | def _get_constants_from_table(self, count, s): |
paul@0 | 446 | l = [] |
paul@0 | 447 | # Have to skip certain entries specially. |
paul@0 | 448 | i = 1 |
paul@0 | 449 | while i < count: |
paul@0 | 450 | c, s = self._decode_const(s) |
paul@0 | 451 | l.append(c) |
paul@0 | 452 | # Add a blank entry after "large" entries. |
paul@0 | 453 | if isinstance(c, LargeNumInfo): |
paul@0 | 454 | l.append(None) |
paul@0 | 455 | i += 1 |
paul@0 | 456 | i += 1 |
paul@0 | 457 | return l, s |
paul@0 | 458 | |
paul@0 | 459 | def _get_items_from_table(self, cls, number, s): |
paul@0 | 460 | l = [] |
paul@0 | 461 | for i in range(0, number): |
paul@0 | 462 | f = cls() |
paul@0 | 463 | s = f.init(s, self) |
paul@0 | 464 | l.append(f) |
paul@0 | 465 | return l, s |
paul@0 | 466 | |
paul@0 | 467 | def _get_methods_from_table(self, number, s): |
paul@0 | 468 | return self._get_items_from_table(MethodInfo, number, s) |
paul@0 | 469 | |
paul@0 | 470 | def _get_fields_from_table(self, number, s): |
paul@0 | 471 | return self._get_items_from_table(FieldInfo, number, s) |
paul@0 | 472 | |
paul@0 | 473 | def _get_attribute_from_table(self, s): |
paul@1 | 474 | attribute_name_index = u2(s[0:2]) |
paul@0 | 475 | constant_name = self.constants[attribute_name_index - 1].bytes |
paul@0 | 476 | if constant_name == "SourceFile": |
paul@0 | 477 | attribute = SourceFileAttributeInfo() |
paul@0 | 478 | elif constant_name == "ConstantValue": |
paul@0 | 479 | attribute = ConstantValueAttributeInfo() |
paul@0 | 480 | elif constant_name == "Code": |
paul@0 | 481 | attribute = CodeAttributeInfo() |
paul@0 | 482 | elif constant_name == "Exceptions": |
paul@0 | 483 | attribute = ExceptionsAttributeInfo() |
paul@0 | 484 | elif constant_name == "InnerClasses": |
paul@0 | 485 | attribute = InnerClassesAttributeInfo() |
paul@0 | 486 | elif constant_name == "Synthetic": |
paul@0 | 487 | attribute = SyntheticAttributeInfo() |
paul@0 | 488 | elif constant_name == "LineNumberTable": |
paul@0 | 489 | attribute = LineNumberAttributeInfo() |
paul@0 | 490 | elif constant_name == "LocalVariableTable": |
paul@0 | 491 | attribute = LocalVariableAttributeInfo() |
paul@0 | 492 | elif constant_name == "Deprecated": |
paul@0 | 493 | attribute = DeprecatedAttributeInfo() |
paul@0 | 494 | else: |
paul@0 | 495 | raise UnknownAttribute, constant_name |
paul@0 | 496 | s = attribute.init(s[2:], self) |
paul@0 | 497 | return attribute, s |
paul@0 | 498 | |
paul@0 | 499 | def _get_attributes_from_table(self, number, s): |
paul@0 | 500 | attributes = [] |
paul@0 | 501 | for i in range(0, number): |
paul@0 | 502 | attribute, s = self._get_attribute_from_table(s) |
paul@0 | 503 | attributes.append(attribute) |
paul@0 | 504 | return attributes, s |
paul@0 | 505 | |
paul@0 | 506 | def _get_constants(self, s): |
paul@1 | 507 | count = u2(s[0:2]) |
paul@0 | 508 | return self._get_constants_from_table(count, s[2:]) |
paul@0 | 509 | |
paul@0 | 510 | def _get_access_flags(self, s): |
paul@1 | 511 | return u2(s[0:2]), s[2:] |
paul@0 | 512 | |
paul@0 | 513 | def _get_this_class(self, s): |
paul@1 | 514 | index = u2(s[0:2]) |
paul@0 | 515 | return self.constants[index - 1], s[2:] |
paul@0 | 516 | |
paul@0 | 517 | _get_super_class = _get_this_class |
paul@0 | 518 | |
paul@0 | 519 | def _get_interfaces(self, s): |
paul@0 | 520 | interfaces = [] |
paul@1 | 521 | number = u2(s[0:2]) |
paul@0 | 522 | s = s[2:] |
paul@0 | 523 | for i in range(0, number): |
paul@1 | 524 | index = u2(s[0:2]) |
paul@0 | 525 | interfaces.append(self.constants[index - 1]) |
paul@0 | 526 | s = s[2:] |
paul@0 | 527 | return interfaces, s |
paul@0 | 528 | |
paul@0 | 529 | def _get_fields(self, s): |
paul@1 | 530 | number = u2(s[0:2]) |
paul@0 | 531 | return self._get_fields_from_table(number, s[2:]) |
paul@0 | 532 | |
paul@0 | 533 | def _get_attributes(self, s): |
paul@1 | 534 | number = u2(s[0:2]) |
paul@0 | 535 | return self._get_attributes_from_table(number, s[2:]) |
paul@0 | 536 | |
paul@0 | 537 | def _get_methods(self, s): |
paul@1 | 538 | number = u2(s[0:2]) |
paul@0 | 539 | return self._get_methods_from_table(number, s[2:]) |
paul@0 | 540 | |
paul@0 | 541 | if __name__ == "__main__": |
paul@0 | 542 | import sys |
paul@0 | 543 | f = open(sys.argv[1]) |
paul@0 | 544 | c = ClassFile(f.read()) |
paul@0 | 545 | |
paul@0 | 546 | # vim: tabstop=4 expandtab shiftwidth=4 |