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216 lines (171 loc) · 5.94 KB
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Copy pathencoder.py
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216 lines (171 loc) · 5.94 KB
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class WriteEncoder:
def __init__(self, tokenDictionary):
self.tokenDictionary = tokenDictionary
def protocolTreeNodeToBytes(self, node):
outBytes = [0] # flags
self.writeInternal(node, outBytes)
return outBytes
def writeInternal(self, node, data):
x = 1 + \
(0 if node.attributes is None else len(node.attributes) * 2) + \
(0 if not node.hasChildren() else 1) + \
(0 if node.data is None else 1)
self.writeListStart(x, data)
self.writeString(node.tag, data)
self.writeAttributes(node.attributes, data);
if node.data is not None:
self.writeBytes(node.data, data)
if node.hasChildren():
self.writeListStart(len(node.children), data);
for c in node.children:
self.writeInternal(c, data);
def writeAttributes(self, attributes, data):
if attributes is not None:
for key, value in attributes.items():
self.writeString(key, data);
self.writeString(value, data, True);
def writeBytes(self, bytes_, data, packed = False):
bytes__ = []
for b in bytes_:
if type(b) is int:
bytes__.append(b)
else:
bytes__.append(ord(b))
size = len(bytes__)
toWrite = bytes__
if size >= 0x100000:
data.append(254)
self.writeInt31(size, data)
elif size >= 0x100:
data.append(253)
self.writeInt20(size, data)
else:
r = None
if packed:
if size < 128:
r = self.tryPackAndWriteHeader(255, bytes__, data)
if r is None:
r = self.tryPackAndWriteHeader(251, bytes__, data)
if r is None:
data.append(252)
self.writeInt8(size, data)
else:
toWrite = r
data.extend(toWrite)
def writeInt8(self, v, data):
data.append(v & 0xFF)
def writeInt16(self, v, data):
data.append((v & 0xFF00) >> 8);
data.append((v & 0xFF) >> 0);
def writeInt20(self, v, data):
data.append((0xF0000 & v) >> 16)
data.append((0xFF00 & v) >> 8)
data.append((v & 0xFF) >> 0)
def writeInt24(self, v, data):
data.append((v & 0xFF0000) >> 16)
data.append((v & 0xFF00) >> 8)
data.append((v & 0xFF) >> 0)
def writeInt31(self, v, data):
data.append((0x7F000000 & v) >> 24)
data.append((0xFF0000 & v) >> 16)
data.append((0xFF00 & v) >> 8)
data.append((v & 0xFF) >> 0)
def writeListStart(self, i, data):
if i == 0:
data.append(0)
elif i < 256:
data.append(248)
self.writeInt8(i, data)
else:
data.append(249)
self.writeInt16(i, data)
def writeToken(self, token, data):
if token <= 255 and token >=0:
data.append(token)
else:
raise ValueError("Invalid token: %s" % token)
def writeString(self, tag, data, packed = False):
tok = self.tokenDictionary.getIndex(tag)
if tok:
index, secondary = tok
if not secondary:
self.writeToken(index, data)
else:
quotient = index // 256
if quotient == 0:
double_byte_token = 236
elif quotient == 1:
double_byte_token = 237
elif quotient == 2:
double_byte_token = 238
elif quotient == 3:
double_byte_token = 239
else:
raise ValueError("Double byte dictionary token out of range")
self.writeToken(double_byte_token, data)
self.writeToken(index % 256, data)
else:
at = '@'.encode() if type(tag) == bytes else '@'
try:
atIndex = tag.index(at)
if atIndex < 1:
raise ValueError("atIndex < 1")
else:
server = tag[atIndex+1:]
user = tag[0:atIndex]
self.writeJid(user, server, data)
except ValueError:
self.writeBytes(self.encodeString(tag), data, packed)
def encodeString(self, string):
res = []
if type(string) == bytes:
for char in string:
res.append(char)
else:
for char in string:
res.append(ord(char))
return res;
def writeJid(self, user, server, data):
data.append(250)
if user is not None:
self.writeString(user, data, True)
else:
self.writeToken(0, data)
self.writeString(server, data)
def tryPackAndWriteHeader(self, v, headerData, data):
size = len(headerData)
if size >= 128:
return None
arr = [0] * int((size + 1) / 2)
for i in range(0, size):
packByte = self.packByte(v, headerData[i])
if packByte == -1:
arr = []
break
n2 = int(i / 2)
arr[n2] |= (packByte << 4 * (1 - i % 2))
if len(arr) > 0:
if size % 2 == 1:
arr[-1] |= 15 #0xF
data.append(v)
self.writeInt8(size %2 << 7 | len(arr), data)
return arr
return None
def packByte(self, v, n2):
if v == 251:
return self.packHex(n2)
if v == 255:
return self.packNibble(n2)
return -1
def packHex(self, n):
if n in range(48, 58):
return n - 48
if n in range(65, 71):
return 10 + (n - 65)
return -1
def packNibble(self, n):
if n in (45, 46):
return 10 + (n - 45)
if n in range(48, 58):
return n - 48
return -1