mirror of https://github.com/hak5/ToorChat.git
287 lines
8.2 KiB
Python
287 lines
8.2 KiB
Python
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import struct
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from StringIO import StringIO
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import vstruct.primitives as vs_prims
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def isVstructType(x):
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return isinstance(x, vs_prims.v_base)
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class VStruct(vs_prims.v_base):
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def __init__(self, bigend=False):
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# A tiny bit of evil...
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object.__setattr__(self, "_vs_values", {})
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vs_prims.v_base.__init__(self)
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self._vs_name = self.__class__.__name__
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self._vs_fields = []
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self._vs_field_align = False # To toggle visual studio style packing
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self._vs_padnum = 0
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self._vs_fmtbase = '<'
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if bigend:
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self._vs_fmtbase = '>'
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def vsGetClassPath(self):
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'''
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Return the entire class name (including module path).
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'''
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return '%s.%s' % (self.__module__, self._vs_name)
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def vsParse(self, bytes, offset=0):
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"""
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For all the primitives contained within, allow them
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an opportunity to parse the given data and return the
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total offset...
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"""
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plist = self.vsGetPrims()
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fmt = self.vsGetFormat()
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size = struct.calcsize(fmt)
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vals = struct.unpack(fmt, bytes[offset:offset+size])
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for i in range(len(plist)):
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plist[i].vsSetParsedValue(vals[i])
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def vsEmit(self):
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"""
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Get back the byte sequence associated with this structure.
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"""
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fmt = self.vsGetFormat()
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r = []
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for p in self.vsGetPrims():
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r.append(p.vsGetFmtValue())
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return struct.pack(fmt, *r)
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def vsGetFormat(self):
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"""
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Return the format specifier which would then be used
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"""
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# Unpack everything little endian, let vsParseValue deal...
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ret = self._vs_fmtbase
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for p in self.vsGetPrims():
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ret += p.vsGetFormat()
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return ret
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def vsIsPrim(self):
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return False
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def vsGetFields(self):
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ret = []
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for fname in self._vs_fields:
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fobj = self._vs_values.get(fname)
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ret.append((fname,fobj))
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return ret
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def vsGetField(self, name):
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x = self._vs_values.get(name)
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if x == None:
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raise Exception("Invalid field: %s" % name)
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return x
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def vsHasField(self, name):
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return self._vs_values.get(name) != None
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def vsSetField(self, name, value):
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if isVstructType(value):
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self._vs_values[name] = value
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return
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x = self._vs_values.get(name)
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return x.vsSetValue(value)
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# FIXME implement more arithmetic for structs...
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def __ixor__(self, other):
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for name,value in other._vs_values.items():
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self._vs_values[name] ^= value
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return self
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def vsAddField(self, name, value):
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if not isVstructType(value):
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raise Exception("Added fields MUST be vstruct types!")
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# Do optional field alignment...
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if self._vs_field_align:
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# If it's a primitive, all is well, if not, pad to size of
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# the first element of the VStruct/VArray...
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if value.vsIsPrim():
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align = len(value)
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else:
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fname = value._vs_fields[0]
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align = len(value._vs_values.get(fname))
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delta = len(self) % align
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if delta != 0:
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print "PADDING %s by %d" % (name,align-delta)
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pname = "_pad%d" % self._vs_padnum
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self._vs_padnum += 1
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self._vs_fields.append(pname)
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self._vs_values[pname] = vs_prims.v_bytes(align-delta)
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self._vs_fields.append(name)
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self._vs_values[name] = value
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def vsGetPrims(self):
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"""
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return an order'd list of the primitive fields in this
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structure definition. This is recursive and will return
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the sub fields of all nested structures.
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"""
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ret = []
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for name, field in self.vsGetFields():
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if field.vsIsPrim():
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ret.append(field)
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else:
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ret.extend(field.vsGetPrims())
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return ret
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def vsGetTypeName(self):
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return self._vs_name
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def vsGetOffset(self, name):
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"""
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Return the offset of a member.
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"""
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offset = 0
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for fname in self._vs_fields:
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if name == fname:
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return offset
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x = self._vs_values.get(fname)
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offset += len(x)
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raise Exception("Invalid Field Specified!")
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def vsGetPrintInfo(self, offset=0, indent=0, top=True):
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ret = []
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if top:
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ret.append((offset, indent, self._vs_name, self))
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indent += 1
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for fname in self._vs_fields:
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x = self._vs_values.get(fname)
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off = offset + self.vsGetOffset(fname)
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if isinstance(x, VStruct):
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ret.append((off, indent, fname, x))
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ret.extend(x.vsGetPrintInfo(offset=off, indent=indent, top=False))
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else:
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ret.append((off, indent, fname, x))
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return ret
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def __len__(self):
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fmt = self.vsGetFormat()
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return struct.calcsize(fmt)
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def __getattr__(self, name):
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# Gotta do this for pickle issues...
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vsvals = self.__dict__.get("_vs_values")
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if vsvals == None:
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vsvals = {}
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self.__dict__["_vs_values"] = vsvals
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r = vsvals.get(name)
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if r is None:
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raise AttributeError(name)
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if isinstance(r, vs_prims.v_prim):
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return r.vsGetValue()
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return r
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def __setattr__(self, name, value):
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# If we have this field, asign to it
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x = self._vs_values.get(name, None)
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if x != None:
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return self.vsSetField(name, value)
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# If it's a vstruct type, create a new field
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if isVstructType(value):
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return self.vsAddField(name, value)
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# Fail over to standard object attribute behavior
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return object.__setattr__(self, name, value)
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def __iter__(self):
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# Our iteration returns name,field pairs
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ret = []
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for name in self._vs_fields:
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ret.append((name, self._vs_values.get(name)))
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return iter(ret)
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def __repr__(self):
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return self._vs_name
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def tree(self, va=0, reprmax=None):
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ret = ""
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for off, indent, name, field in self.vsGetPrintInfo():
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rstr = field.vsGetTypeName()
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if isinstance(field, vs_prims.v_number):
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val = field.vsGetValue()
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rstr = '0x%.8x (%d)' % (val,val)
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elif isinstance(field, vs_prims.v_prim):
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rstr = repr(field)
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if reprmax != None and len(rstr) > reprmax:
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rstr = rstr[:reprmax] + '...'
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ret += "%.8x (%.2d)%s %s: %s\n" % (va+off, len(field), " "*(indent*2),name,rstr)
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return ret
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class VArray(VStruct):
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def __init__(self, elems=()):
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VStruct.__init__(self)
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for e in elems:
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self.vsAddElement(e)
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def vsAddElement(self, elem):
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"""
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Used to add elements to an array
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"""
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idx = len(self._vs_fields)
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self.vsAddField("%d" % idx, elem)
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def __getitem__(self, index):
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return self.vsGetField("%d" % index)
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#FIXME slice asignment
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def resolve(impmod, nameparts):
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"""
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Resolve the given (potentially nested) object
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from within a module.
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"""
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if not nameparts:
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return None
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m = impmod
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for nname in nameparts:
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m = getattr(m, nname, None)
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if m == None:
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break
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return m
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# NOTE: Gotta import this *after* VStruct/VSArray defined
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import vstruct.defs as vs_defs
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def getStructure(sname):
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"""
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Return an instance of the specified structure. The
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structure name may be a definition that was added with
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addStructure() or a python path (ie. win32.TEB) of a
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definition from within vstruct.defs.
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"""
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x = resolve(vs_defs, sname.split("."))
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if x != None:
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return x()
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return None
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def getModuleNames():
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return [x for x in dir(vs_defs) if not x.startswith("__")]
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def getStructNames(modname):
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ret = []
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mod = resolve(vs_defs, modname)
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if mod == None:
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return ret
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for n in dir(mod):
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x = getattr(mod, n)
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if issubclass(x, VStruct):
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ret.append(n)
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return ret
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