Macintosh-Tools/python-rsrcfork
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Collapse multiple subsequent identical lines in hex dumps

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dgelessus 2019-09-13 10:40:03 +02:00
parent 752ec9e828
commit b2fa5f8b0f
2 changed files with 15 additions and 4 deletions
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2
README.rst
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@ -130,7 +130,7 @@ Changelog
Version 1.2.1 (next version)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
* (no changes yet)
* Changed ``--format=dump`` output to collapse multiple subsequent identical lines into a single ``*``.
Version 1.2.0
^^^^^^^^^^^^^

17
rsrcfork/__main__.py
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@ -155,11 +155,22 @@ def _filter_resources(rf: api.ResourceFile, filters: typing.Sequence[str]) -> ty
return list(matching.values())
def _hexdump(data: bytes):
last_line = None
asterisk_shown = False
for i in range(0, len(data), 16):
line = data[i:i + 16]
line_hex = " ".join(f"{byte:02x}" for byte in line)
line_char = line.decode(_TEXT_ENCODING).translate(_TRANSLATE_NONPRINTABLES)
print(f"{i:08x} {line_hex:<{16*2+15}} |{line_char}|")
# If the same 16-byte lines appear multiple times, print only the first one, and replace all further lines with a single line with an asterisk.
# This is unambiguous - to find out how many lines were collapsed this way, the user can compare the addresses of the lines before and after the asterisk.
if line == last_line:
if not asterisk_shown:
print("*")
asterisk_shown = True
else:
line_hex = " ".join(f"{byte:02x}" for byte in line)
line_char = line.decode(_TEXT_ENCODING).translate(_TRANSLATE_NONPRINTABLES)
print(f"{i:08x} {line_hex:<{16*2+15}} |{line_char}|")
asterisk_shown = False
last_line = line
if data:
print(f"{len(data):08x}")