mirror of
https://github.com/elliotnunn/macresources.git
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66 lines
1.9 KiB
Python
Executable File
66 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python3
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import argparse
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import macresources
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import sys
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def fourcc(s):
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b = s.encode('mac_roman').ljust(4, b' ')
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if len(b) != 4:
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raise ValueError('wrong length')
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return b
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def seemshex(s):
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s = s.lower()
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if not s: return False
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return all(c in '0123456789abcdef' for c in s)
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def seemsdec(s):
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if not s: return False
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return all(c in '0123456789' for c in s)
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def resid(s):
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s = s.lower()
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if s.startswith('0x') and seemshex(s[2:]):
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thenum = int(s[2:], 16)
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if thenum > 0x7fff: thenum -= 0x8000
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elif s.startswith('$') and seemshex(s[1:]):
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thenum = int(s[1:], 16)
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if thenum > 0x7fff: thenum -= 0x8000
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else:
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thenum = int(s)
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if not (-0x8000 <= thenum <= 0x7fff): raise ValueError
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return thenum
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parser = argparse.ArgumentParser(description='''
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Copy a single MacOS resource from a source file to the standard
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output. If the source filename ends with `.r' or `.rdump', then it
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is parsed using the `SimpleRez' subset of the Rez language. TODO:
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find a way to specify null characters so that desk accessories can
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be looked up by name.
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''')
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parser.add_argument('srcfile', help='resource file or Rez file')
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parser.add_argument('type', type=fourcc, help='four-byte type of resource (converted to Mac Roman pre-lookup)')
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parser.add_argument('id', type=resid, help='ID number of resource (-32768 to 32767)')
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args = parser.parse_args()
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with open(args.srcfile, 'rb') as f:
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raw = f.read()
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if args.srcfile.endswith('.r') or args.srcfile.endswith('.rdump'):
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resources = macresources.parse_rez_code(raw)
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else:
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resources = macresources.parse_file(raw)
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for r in resources:
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if r.type == args.type and r.id == args.id:
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try:
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sys.stdout.buffer.write(r.data)
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except BrokenPipeError:
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pass
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break
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else:
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raise ValueError(args.type, args.id)
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