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Edit File : minigzip.py \| Size : 4.20 KB
#! /usr/bin/python2.7 # Demo program for zlib; it compresses or decompresses files, but doesn't # delete the original. This doesn't support all of gzip's options. # # The 'gzip' module in the standard library provides a more complete # implementation of gzip-format files. import zlib, sys, os FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16 def write32(output, value): output.write(chr(value & 255)) ; value=value // 256 output.write(chr(value & 255)) ; value=value // 256 output.write(chr(value & 255)) ; value=value // 256 output.write(chr(value & 255)) def read32(input): v = ord(input.read(1)) v += (ord(input.read(1)) << 8 ) v += (ord(input.read(1)) << 16) v += (ord(input.read(1)) << 24) return v 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. def decompress (input, output): magic = input.read(2) if magic != '\037\213': print 'Not a gzipped file' sys.exit(0) if ord(input.read(1)) != 8: print 'Unknown compression method' sys.exit(0) flag = ord(input.read(1)) input.read(4+1+1) # Discard modification time, # extra flags, and OS byte. if flag & FEXTRA: # Read & discard the extra field, if present xlen = ord(input.read(1)) xlen += 256*ord(input.read(1)) input.read(xlen) if flag & FNAME: # Read and discard a null-terminated string containing the filename while True: s = input.read(1) if s == '\0': break if flag & FCOMMENT: # Read and discard a null-terminated string containing a comment while True: s=input.read(1) if s=='\0': break if flag & FHCRC: input.read(2) # Read & discard the 16-bit header CRC decompobj = zlib.decompressobj(-zlib.MAX_WBITS) crcval = zlib.crc32("") length = 0 while True: data=input.read(1024) if data == "": break decompdata = decompobj.decompress(data) output.write(decompdata) length += len(decompdata) crcval = zlib.crc32(decompdata, crcval) decompdata = decompobj.flush() output.write(decompdata) length += len(decompdata) crcval = zlib.crc32(decompdata, crcval) # We've read to the end of the file, so we have to rewind in order # to reread the 8 bytes containing the CRC and the file size. The # decompressor is smart and knows when to stop, so feeding it # extra data is harmless. input.seek(-8, 2) crc32 = read32(input) isize = read32(input) if crc32 != crcval: print 'CRC check failed.' if isize != length: print 'Incorrect length of data produced' def main(): if len(sys.argv)!=2: print 'Usage: minigzip.py <filename>' print ' The file will be compressed or decompressed.' sys.exit(0) filename = sys.argv[1] if filename.endswith('.gz'): compressing = False outputname = filename[:-3] else: compressing = True outputname = filename + '.gz' input = open(filename, 'rb') output = open(outputname, 'wb') if compressing: compress(filename, input, output) else: decompress(input, output) input.close() output.close() if __name__ == '__main__': main() Back

Edit File : minigzip.py | Size : 4.20 KB

#! /usr/bin/python2.7
# Demo program for zlib; it compresses or decompresses files, but *doesn't*
# delete the original.  This doesn't support all of gzip's options.
#
# The 'gzip' module in the standard library provides a more complete
# implementation of gzip-format files.

import zlib, sys, os

FTEXT, FHCRC, FEXTRA, FNAME, FCOMMENT = 1, 2, 4, 8, 16

def write32(output, value):
    output.write(chr(value & 255)) ; value=value // 256
    output.write(chr(value & 255)) ; value=value // 256
    output.write(chr(value & 255)) ; value=value // 256
    output.write(chr(value & 255))

def read32(input):
    v = ord(input.read(1))
    v += (ord(input.read(1)) << 8 )
    v += (ord(input.read(1)) << 16)
    v += (ord(input.read(1)) << 24)
    return v

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.

def decompress (input, output):
    magic = input.read(2)
    if magic != '\037\213':
        print 'Not a gzipped file'
        sys.exit(0)
    if ord(input.read(1)) != 8:
        print 'Unknown compression method'
        sys.exit(0)
    flag = ord(input.read(1))
    input.read(4+1+1)                   # Discard modification time,
                                        # extra flags, and OS byte.
    if flag & FEXTRA:
        # Read & discard the extra field, if present
        xlen = ord(input.read(1))
        xlen += 256*ord(input.read(1))
        input.read(xlen)
    if flag & FNAME:
        # Read and discard a null-terminated string containing the filename
        while True:
            s = input.read(1)
            if s == '\0': break
    if flag & FCOMMENT:
        # Read and discard a null-terminated string containing a comment
        while True:
            s=input.read(1)
            if s=='\0': break
    if flag & FHCRC:
        input.read(2)                   # Read & discard the 16-bit header CRC

decompobj = zlib.decompressobj(-zlib.MAX_WBITS)
    crcval = zlib.crc32("")
    length = 0
    while True:
        data=input.read(1024)
        if data == "":
            break
        decompdata = decompobj.decompress(data)
        output.write(decompdata)
        length += len(decompdata)
        crcval = zlib.crc32(decompdata, crcval)

decompdata = decompobj.flush()
    output.write(decompdata)
    length += len(decompdata)
    crcval = zlib.crc32(decompdata, crcval)

# We've read to the end of the file, so we have to rewind in order
    # to reread the 8 bytes containing the CRC and the file size.  The
    # decompressor is smart and knows when to stop, so feeding it
    # extra data is harmless.
    input.seek(-8, 2)
    crc32 = read32(input)
    isize = read32(input)
    if crc32 != crcval:
        print 'CRC check failed.'
    if isize != length:
        print 'Incorrect length of data produced'

def main():
    if len(sys.argv)!=2:
        print 'Usage: minigzip.py <filename>'
        print '  The file will be compressed or decompressed.'
        sys.exit(0)

filename = sys.argv[1]
    if filename.endswith('.gz'):
        compressing = False
        outputname = filename[:-3]
    else:
        compressing = True
        outputname = filename + '.gz'

input = open(filename, 'rb')
    output = open(outputname, 'wb')

if compressing:
        compress(filename, input, output)
    else:
        decompress(input, output)

input.close()
    output.close()

if __name__ == '__main__':
    main()

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