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#!/usr/bin/env python2
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
from . import globals
import struct
from xml.sax.saxutils import quoteattr
class BinaryStream:
"""Represents a binary stream, e.g. 'WordDocument' in an [MS-DOC] file."""
def __init__(self, bytes, params=None, name=None, mainStream=None, doc=None):
self.bytes = bytes
self.size = len(self.bytes)
self.pos = 0
self.params = params
self.name = name
self.mainStream = mainStream
self.doc = doc
def printAndSet(self, key, value, hexdump=True, end=True, offset=False, silent=False, dict=None, default=None):
setattr(self, key, value)
if silent:
return
attrs = ""
if dict:
if value in dict or default is None:
attrs += ' name="%s"' % dict[value]
else:
attrs += ' name="%s"' % default
if hexdump and type(value) != float:
value = hex(value)
if offset:
attrs += ' offset="%s"' % hex(self.pos)
if end:
print('<%s value="%s"%s/>' % (key, value, attrs))
else:
print('<%s value="%s"%s>' % (key, value, attrs))
def quoteAttr(self, value):
"""Wrapper around xml.sax.saxutils.quoteattr, assumes the caller will put " around the result."""
if globals.PY3:
if isinstance(value, bytes):
# can't have bytes here, crashes later in saxutils
value = value.decode('cp1252')
ret = quoteattr("'" + value + "'")
return ret[2:len(ret) - 2]
def getuInt8(self, bytes=None, pos=None):
if not bytes:
bytes = self.bytes
if not pos:
pos = self.pos
return struct.unpack("<B", bytes[pos:pos + 1])[0]
def readuInt8(self):
ret = self.getuInt8()
self.pos += 1
return ret
def getuInt16(self, bytes=None, pos=None):
if not bytes:
bytes = self.bytes
if not pos:
pos = self.pos
return struct.unpack("<H", bytes[pos:pos + 2])[0]
def readuInt16(self):
ret = self.getuInt16()
self.pos += 2
return ret
def getInt16(self, bytes=None, pos=None):
if not bytes:
bytes = self.bytes
if not pos:
pos = self.pos
return struct.unpack("<h", bytes[pos:pos + 2])[0]
def readInt16(self):
ret = self.getInt16()
self.pos += 2
return ret
def getuInt24(self):
return struct.unpack("<I", self.bytes[self.pos:self.pos + 3] + b"\x00")[0]
def getuInt32(self, bytes=None, pos=None):
if not bytes:
bytes = self.bytes
if not pos:
pos = self.pos
return struct.unpack("<I", bytes[pos:pos + 4])[0]
def readuInt32(self):
ret = self.getuInt32()
self.pos += 4
return ret
def getInt32(self, bytes=None, pos=None):
if not bytes:
bytes = self.bytes
if not pos:
pos = self.pos
return struct.unpack("<i", bytes[pos:pos + 4])[0]
def readInt32(self):
ret = self.getInt32()
self.pos += 4
return ret
def getFloat32(self, bytes=None, pos=None):
if not bytes:
bytes = self.bytes
if not pos:
pos = self.pos
return struct.unpack("<f", bytes[pos:pos + 4])[0]
def readFloat32(self):
ret = self.getFloat32()
self.pos += 4
return ret
def getuInt64(self, bytes=None, pos=None):
if not bytes:
bytes = self.bytes
if not pos:
pos = self.pos
return struct.unpack("<Q", bytes[pos:pos + 8])[0]
def readuInt64(self):
ret = self.getuInt64()
self.pos += 8
return ret
def __getString(self, limit):
bytes = []
count = 0
pos = self.pos
while True:
if (limit is not None) and count == limit:
break
i = self.getuInt8(pos=pos)
pos += 1
j = self.getuInt8(pos=pos)
pos += 1
if i != 0 or j != 0:
bytes.append(i)
bytes.append(j)
else:
break
count += 1
return (self.quoteAttr(globals.encodeName(globals.getUTF8FromUTF16("".join(map(lambda x: chr(x), bytes))))), pos)
def getString(self, limit=None):
return self.__getString(limit)[0]
def readString(self, limit=None):
ret, pos = self.__getString(limit)
self.pos = pos
return ret
def getBit(self, byte, bitNumber):
return (byte & (1 << bitNumber)) >> bitNumber
def dump(self):
print('<stream name="%s" size="%s"/>' % (self.quoteAttr(globals.encodeName(self.name)), self.size))
# compat methods to make msodraw happy
def readUnsignedInt(self, size):
if size == 1:
return self.readuInt8()
elif size == 2:
return self.readuInt16()
elif size == 4:
return self.readuInt32()
raise Exception
def readSignedInt(self, size):
if size == 4:
return self.readInt32()
raise Exception
def readBytes(self, length):
r = self.bytes[self.pos:self.pos + length]
self.pos += length
return r
def moveForward(self, byteCount):
self.pos += byteCount
def appendLine(self, line):
print("%s" % line)
# vim:set filetype=python shiftwidth=4 softtabstop=4 expandtab:
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