Created
August 2, 2018 01:41
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MacOS resource fork parser
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| #!/usr/bin/env python3 | |
| # Parses out classic MacOS resource fork data into files | |
| # See https://developer.apple.com/library/archive/documentation/mac/pdf/MoreMacintoshToolbox.pdf | |
| import os | |
| import struct | |
| import sys | |
| def CharConst(n): | |
| return chr((n & 0xFF000000) >> 24) + chr((n & 0x00FF0000) >> 16) + chr((n & 0x0000FF00) >> 8) + chr(n & 0x000000FF) | |
| if len(sys.argv) != 3: | |
| print('Usage: forker.py <rsrc_file> <output_dir>') | |
| sys.exit(1) | |
| os.makedirs(sys.argv[2], exist_ok=True) | |
| data = open(sys.argv[1], 'rb').read() | |
| # resource header | |
| data_offset, map_offset, data_len, map_len = struct.unpack('!4L', data[:16]) | |
| # resource map | |
| fork_attrs, type_list_offset, name_list_offset, num_types = struct.unpack('!4H', data[map_offset+22:map_offset+30]) | |
| offset = map_offset + type_list_offset + 2 # already read num_types above | |
| for i in range(num_types + 1): | |
| # type list entry | |
| rsrc_type, num_resources, rsrc_list_offset = struct.unpack('!LHH', data[offset:offset+8]) | |
| rsrc_offset = map_offset + type_list_offset + rsrc_list_offset | |
| for k in range(num_resources): | |
| # reference list entry | |
| rsrc_id, name_offset, rsrc_info = struct.unpack('!HHL', data[rsrc_offset:rsrc_offset+8]) | |
| rsrc_attrs = rsrc_info >> 24 | |
| rsrc_data_offset = data_offset + (rsrc_info & 0x00FFFFFF) | |
| rsrc_data_len = struct.unpack('!L', data[rsrc_data_offset:rsrc_data_offset+4])[0] | |
| rsrc_data = data[rsrc_data_offset+4:rsrc_data_offset+4+rsrc_data_len] | |
| rsrc_dir = os.path.join(sys.argv[2], CharConst(rsrc_type)) | |
| rsrc_path = os.path.join(rsrc_dir, str(rsrc_id)) | |
| print('{} #{} ({} bytes) --> {}'.format(CharConst(rsrc_type), rsrc_id, rsrc_data_len, rsrc_path)) | |
| os.makedirs(rsrc_dir, exist_ok=True) | |
| with open(rsrc_path, 'wb') as f: | |
| f.write(rsrc_data) | |
| rsrc_offset += 12 | |
| offset += 8 |
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