fix line endings
This commit is contained in:
128
youtube/proto.py
128
youtube/proto.py
@@ -1,65 +1,65 @@
|
||||
from math import ceil
|
||||
import base64
|
||||
|
||||
def byte(n):
|
||||
return bytes((n,))
|
||||
|
||||
|
||||
def varint_encode(offset):
|
||||
'''In this encoding system, for each 8-bit byte, the first bit is 1 if there are more bytes, and 0 is this is the last one.
|
||||
The next 7 bits are data. These 7-bit sections represent the data in Little endian order. For example, suppose the data is
|
||||
aaaaaaabbbbbbbccccccc (each of these sections is 7 bits). It will be encoded as:
|
||||
1ccccccc 1bbbbbbb 0aaaaaaa
|
||||
|
||||
This encoding is used in youtube parameters to encode offsets and to encode the length for length-prefixed data.
|
||||
See https://developers.google.com/protocol-buffers/docs/encoding#varints for more info.'''
|
||||
needed_bytes = ceil(offset.bit_length()/7) or 1 # (0).bit_length() returns 0, but we need 1 in that case.
|
||||
encoded_bytes = bytearray(needed_bytes)
|
||||
for i in range(0, needed_bytes - 1):
|
||||
encoded_bytes[i] = (offset & 127) | 128 # 7 least significant bits
|
||||
offset = offset >> 7
|
||||
encoded_bytes[-1] = offset & 127 # leave first bit as zero for last byte
|
||||
|
||||
return bytes(encoded_bytes)
|
||||
|
||||
|
||||
def varint_decode(encoded):
|
||||
decoded = 0
|
||||
for i, byte in enumerate(encoded):
|
||||
decoded |= (byte & 127) << 7*i
|
||||
|
||||
if not (byte & 128):
|
||||
break
|
||||
return decoded
|
||||
|
||||
|
||||
def string(field_number, data):
|
||||
data = as_bytes(data)
|
||||
return _proto_field(2, field_number, varint_encode(len(data)) + data)
|
||||
nested = string
|
||||
|
||||
def uint(field_number, value):
|
||||
return _proto_field(0, field_number, varint_encode(value))
|
||||
|
||||
|
||||
|
||||
|
||||
def _proto_field(wire_type, field_number, data):
|
||||
''' See https://developers.google.com/protocol-buffers/docs/encoding#structure '''
|
||||
return varint_encode( (field_number << 3) | wire_type) + data
|
||||
|
||||
|
||||
|
||||
def percent_b64encode(data):
|
||||
return base64.urlsafe_b64encode(data).replace(b'=', b'%3D')
|
||||
|
||||
|
||||
def unpadded_b64encode(data):
|
||||
return base64.urlsafe_b64encode(data).replace(b'=', b'')
|
||||
|
||||
def as_bytes(value):
|
||||
if isinstance(value, str):
|
||||
return value.encode('ascii')
|
||||
return value
|
||||
|
||||
from math import ceil
|
||||
import base64
|
||||
|
||||
def byte(n):
|
||||
return bytes((n,))
|
||||
|
||||
|
||||
def varint_encode(offset):
|
||||
'''In this encoding system, for each 8-bit byte, the first bit is 1 if there are more bytes, and 0 is this is the last one.
|
||||
The next 7 bits are data. These 7-bit sections represent the data in Little endian order. For example, suppose the data is
|
||||
aaaaaaabbbbbbbccccccc (each of these sections is 7 bits). It will be encoded as:
|
||||
1ccccccc 1bbbbbbb 0aaaaaaa
|
||||
|
||||
This encoding is used in youtube parameters to encode offsets and to encode the length for length-prefixed data.
|
||||
See https://developers.google.com/protocol-buffers/docs/encoding#varints for more info.'''
|
||||
needed_bytes = ceil(offset.bit_length()/7) or 1 # (0).bit_length() returns 0, but we need 1 in that case.
|
||||
encoded_bytes = bytearray(needed_bytes)
|
||||
for i in range(0, needed_bytes - 1):
|
||||
encoded_bytes[i] = (offset & 127) | 128 # 7 least significant bits
|
||||
offset = offset >> 7
|
||||
encoded_bytes[-1] = offset & 127 # leave first bit as zero for last byte
|
||||
|
||||
return bytes(encoded_bytes)
|
||||
|
||||
|
||||
def varint_decode(encoded):
|
||||
decoded = 0
|
||||
for i, byte in enumerate(encoded):
|
||||
decoded |= (byte & 127) << 7*i
|
||||
|
||||
if not (byte & 128):
|
||||
break
|
||||
return decoded
|
||||
|
||||
|
||||
def string(field_number, data):
|
||||
data = as_bytes(data)
|
||||
return _proto_field(2, field_number, varint_encode(len(data)) + data)
|
||||
nested = string
|
||||
|
||||
def uint(field_number, value):
|
||||
return _proto_field(0, field_number, varint_encode(value))
|
||||
|
||||
|
||||
|
||||
|
||||
def _proto_field(wire_type, field_number, data):
|
||||
''' See https://developers.google.com/protocol-buffers/docs/encoding#structure '''
|
||||
return varint_encode( (field_number << 3) | wire_type) + data
|
||||
|
||||
|
||||
|
||||
def percent_b64encode(data):
|
||||
return base64.urlsafe_b64encode(data).replace(b'=', b'%3D')
|
||||
|
||||
|
||||
def unpadded_b64encode(data):
|
||||
return base64.urlsafe_b64encode(data).replace(b'=', b'')
|
||||
|
||||
def as_bytes(value):
|
||||
if isinstance(value, str):
|
||||
return value.encode('ascii')
|
||||
return value
|
||||
|
||||
|
||||
Reference in New Issue
Block a user