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67 lines
1.7 KiB
Python
67 lines
1.7 KiB
Python
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#!/usr/bin/python
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import struct, sys
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class Cpio:
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"""cpio archive small files in memory, using new style portable header format"""
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def __init__(self):
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self.cpio = ''
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def add(self, name=None, content=None):
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namesize = len(name) + 1
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if namesize % 2:
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name += '\0'
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filesize = len(content)
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c = []
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c.append('070701') # magic
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c.append('%08X' % 0) # inode
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c.append('%08X' % 0) # mode
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c.append('%08X' % 0) # uid
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c.append('%08X' % 0) # gid
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c.append('%08X' % 0) # nlink
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c.append('%08X' % 0) # mtime
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c.append('%08X' % filesize)
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c.append('%08X' % 0) # major
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c.append('%08X' % 0) # minor
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c.append('%08X' % 0) # rmajor
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c.append('%08X' % 0) # rminor
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c.append('%08X' % namesize)
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c.append('%08X' % 0) # checksum
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c.append(name + '\0')
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c.append('\0' * (len(''.join(c)) % 4))
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c.append(content)
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c = ''.join(c)
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sys.stderr.write('%s\n' % len(c))
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if len(c) % 4:
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c += '\0' * (4 - len(c) % 4)
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sys.stderr.write('%s\n\n' % len(c))
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self.cpio += c
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def add_padding(self):
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if len(self.cpio) % 512:
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self.cpio += '\0' * (512 - len(self.cpio) % 512)
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def get(self):
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self.add('TRAILER!!!', '')
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self.add_padding()
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return ''.join(self.cpio)
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def main():
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cpio = Cpio()
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cpio.add(name='asdf', content='123\n')
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cpio.add(name='bar', content='foo1\n')
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cpio.add(name='services', content=open('/etc/services').read())
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sys.stdout.write(cpio.get())
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if __name__ == '__main__':
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main()
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