Created
February 10, 2021 07:54
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reduce torrent filename length
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| from bcoding import bencode, bdecode | |
| import sys | |
| import time | |
| import os | |
| import pathlib | |
| remapped = {} | |
| rename_list = [] | |
| def shorten_filename(name, length): | |
| left = 0 | |
| right = len(name) | |
| middle = 0 | |
| while right != left and right - 1 != left: | |
| middle = int((left + right)/2) | |
| if len(name[:middle].encode('utf8')) > length: | |
| right = middle | |
| else: | |
| left = middle | |
| # print(left, right, middle, len(name[:middle].encode('utf8')), length) | |
| return name[:middle-1] | |
| bt = None | |
| with open(sys.argv[1], 'rb') as fp: | |
| bt = bdecode(fp) | |
| for file in bt['info']['files']: | |
| changed = False | |
| original = file['path'][:] | |
| for index, part in enumerate(file['path']): | |
| t = tuple(file['path'][:index+1]) | |
| if t in remapped: | |
| file['path'][index] = remapped[t] | |
| continue | |
| if len(part.encode('utf-8')) > 255: | |
| name, ext = os.path.splitext(part) | |
| capped = shorten_filename(name, 254 - len(ext.encode('utf8'))) | |
| new_name = capped + ext | |
| file['path'][index] = new_name | |
| new_t = tuple(file['path'][:index] + [new_name]) | |
| remapped[new_t] = new_name | |
| changed = True | |
| if changed: | |
| rename_list.append(("/".join(original), "/".join(file['path']))) | |
| for l, r in rename_list: | |
| print(l, '->', r) | |
| if rename_list: | |
| original = pathlib.Path(sys.argv[1]) | |
| original.rename(original.with_name(original.name + '.bak')) | |
| with open(sys.argv[1], 'wb') as fp: | |
| bencode(bt, fp) |
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Note: infohash is calculated based in info's bencode, changing name in info dictionary resulting in tracker reject modified torrent.