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