Copy files inside a zip into another zip file without uncompress it ahead, improve the speed,

copy_file_in_zip.py

#!/usr/bin/env python

"""
Copy files inside a zip into another zip file without uncompress it ahead, improve the speed,
"""

import zipfile


def zipfile_get_entry(source, name):
    """Read a file entry pair (zipinfo, zipextfile) from a zip file"""
    return source.getinfo(name), source.open(name)


def zipfile_write_entry(target, zipinfo, zipextfile):
    """Direct copy the file entry from source into target without uncompression."""
    # Create ZipInfo instance to store file information
    zinfo = zipinfo
    zinfo.header_offset = target.fp.tell()  # Start of header bytes

    target._writecheck(zinfo)
    target._didModify = True

    # Read all compressed content for source file
    buf = zipextfile._fileobj.read(zipextfile._compress_size)

    target.fp.write(zinfo.FileHeader())
    target.fp.write(buf)

    target.filelist.append(zinfo)
    target.NameToInfo[zinfo.filename] = zinfo


def main():
    source = zipfile.ZipFile('blade.zip', 'r')
    with zipfile.ZipFile('out.zip', 'w') as out:
        for name in source.namelist():
            zi, ze = zipfile_get_entry(source, name)
            zipfile_write_entry(out, zi, ze)


if __name__ == '__main__':
    main()

将zip文件中的文件复制到另一个zip文件中，而无需提前对其进行解压缩，从而提高了速度。