minigzip.py 文件源码

def compress (filename, input, output):
    output.write('\037\213\010')        # Write the header, ...
    output.write(chr(FNAME))            # ... flag byte ...

    statval = os.stat(filename)           # ... modification time ...
    mtime = statval[8]
    write32(output, mtime)
    output.write('\002')                # ... slowest compression alg. ...
    output.write('\377')                # ... OS (=unknown) ...
    output.write(filename+'\000')       # ... original filename ...

    crcval = zlib.crc32("")
    compobj = zlib.compressobj(9, zlib.DEFLATED, -zlib.MAX_WBITS,
                             zlib.DEF_MEM_LEVEL, 0)
    while True:
        data = input.read(1024)
        if data == "":
            break
        crcval = zlib.crc32(data, crcval)
        output.write(compobj.compress(data))
    output.write(compobj.flush())
    write32(output, crcval)             # ... the CRC ...
    write32(output, statval[6])         # and the file size.