TinyFrame, Python version
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PonyFrame/PayloadBuilder.py

61 lines
1.8 KiB

import struct
class PayloadBuilder:
"""
Utility for building binary payloads
"""
def __init__(self, endian='little'):
self.buf = bytearray()
self.endian = endian
def close(self):
""" Get the byte buffer """
return self.buf
def u8(self, num):
""" Add a uint8_t """
self.buf.extend(num.to_bytes(length=1, byteorder=self.endian, signed=False))
def u16(self, num):
""" Add a uint16_t """
self.buf.extend(num.to_bytes(length=2, byteorder=self.endian, signed=False))
def u32(self, num):
""" Add a uint32_t """
self.buf.extend(num.to_bytes(length=4, byteorder=self.endian, signed=False))
def i8(self, num):
""" Add a int8_t """
self.buf.extend(num.to_bytes(length=1, byteorder=self.endian, signed=True))
def i16(self, num):
""" Add a int16_t """
self.buf.extend(num.to_bytes(length=2, byteorder=self.endian, signed=True))
def i32(self, num):
""" Add a int32_t """
self.buf.extend(num.to_bytes(length=4, byteorder=self.endian, signed=True))
def float(self, num):
""" Add a float (4 bytes) """
fmt = '<f' if self.endian == 'little' else '>f'
self.buf.extend(struct.pack(fmt, num))
def double(self, num):
""" Add a double (8 bytes) """
fmt = '<d' if self.endian == 'little' else '>d'
self.buf.extend(struct.pack(fmt, num))
def bool(self, num):
""" Add a bool (0 or 1) """
self.buf.append(1 if num != False else 0)
def str(self, string):
""" Add a 0-terminated string """
self.buf.extend(string.encode('utf-8'))
self.buf.append(0)
def blob(self, blob):
""" Ad an arbitrary blob (bytearray or binary string) """
self.buf.extend(blob)