mbirth/gcd-parser
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Code Issues 5 Pull Requests Activity

Use MAX_BLOCK_LENGTH instead of hardcoded value.

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This commit is contained in:
Markus Birth 2018-12-10 02:59:28 +01:00
parent 47450ffdce
commit e07338c882
Signed by: mbirth
GPG Key ID: A9928D7A098C3A9A
1 changed files with 3 additions and 3 deletions
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grmn/gcd.py
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@ -10,7 +10,7 @@ GCD_SIG = b"G\x41RM\x49Nd\00"
DEFAULT_COPYRIGHT = b"Copyright 1996-2017 by G\x61rm\x69n Ltd. or its subsidiaries." DEFAULT_COPYRIGHT = b"Copyright 1996-2017 by G\x61rm\x69n Ltd. or its subsidiaries."
DEFAULT_FIRST_PADDING = 21 DEFAULT_FIRST_PADDING = 21
DEFAULT_ALIGN = 0x1000 # second padding block pads until 0x1000 DEFAULT_ALIGN = 0x1000 # second padding block pads until 0x1000
MAX_BLOCK_LENGTH = 0xff00 # binary blocks max len MAX_BLOCK_LENGTH = 0xff00 # binary blocks max len (0xff40 for some blocks)
# Typical structure: # Typical structure:
# first 0x1000 Bytes: GCD_SIG > 0x0001 > 0x0002 > 0x0003 > 0x0005 > 0x0001 > 0x0002 # first 0x1000 Bytes: GCD_SIG > 0x0001 > 0x0002 > 0x0003 > 0x0005 > 0x0001 > 0x0002
@ -199,12 +199,12 @@ class Gcd:
running_count = 0 running_count = 0
with open(filename, "rb") as bf: with open(filename, "rb") as bf:
while True: while True:
read_bytes = bf.read(0xff00) read_bytes = bf.read(MAX_BLOCK_LENGTH)
btlv = TLVbinary(file_type_id, len(read_bytes)) btlv = TLVbinary(file_type_id, len(read_bytes))
btlv.value = read_bytes btlv.value = read_bytes
gcd.struct.append(btlv) gcd.struct.append(btlv)
running_count += len(read_bytes) running_count += len(read_bytes)
if len(read_bytes) < 0xff00: if len(read_bytes) < MAX_BLOCK_LENGTH:
break break
bf.close() bf.close()
tlv7.set_binary_length(running_count) tlv7.set_binary_length(running_count)