diff options
Diffstat (limited to 'Demo')
| -rwxr-xr-x | Demo/zlib/minigzip.py | 43 |
1 files changed, 22 insertions, 21 deletions
diff --git a/Demo/zlib/minigzip.py b/Demo/zlib/minigzip.py index b2af7f9..52e81b9 100755 --- a/Demo/zlib/minigzip.py +++ b/Demo/zlib/minigzip.py @@ -10,10 +10,10 @@ 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)) + output.write(bytes([value & 255])) ; value=value // 256 + output.write(bytes([value & 255])) ; value=value // 256 + output.write(bytes([value & 255])) ; value=value // 256 + output.write(bytes([value & 255])) def read32(input): v = ord(input.read(1)) @@ -22,23 +22,24 @@ def read32(input): 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 ... +def compress(filename, input, output): + output.write(b'\037\213\010') # Write the header, ... + output.write(bytes([FNAME])) # ... flag byte ... - statval = os.stat(filename) # ... modification time ... + 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 ... + output.write(b'\002') # ... slowest compression alg. ... + output.write(b'\377') # ... OS (=unknown) ... + bfilename = filename.encode(sys.getfilesystemencoding()) + output.write(bfilename + b'\000') # ... original filename ... - crcval = zlib.crc32("") + crcval = zlib.crc32(b'') compobj = zlib.compressobj(9, zlib.DEFLATED, -zlib.MAX_WBITS, zlib.DEF_MEM_LEVEL, 0) while True: data = input.read(1024) - if data == "": + if data == b'': break crcval = zlib.crc32(data, crcval) output.write(compobj.compress(data)) @@ -46,9 +47,9 @@ def compress (filename, input, output): write32(output, crcval) # ... the CRC ... write32(output, statval[6]) # and the file size. -def decompress (input, output): +def decompress(input, output): magic = input.read(2) - if magic != '\037\213': + if magic != b'\037\213': print('Not a gzipped file') sys.exit(0) if ord(input.read(1)) != 8: @@ -66,21 +67,21 @@ def decompress (input, output): # Read and discard a null-terminated string containing the filename while True: s = input.read(1) - if s == '\0': break + if s == b'\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 + s = input.read(1) + if s == b'\0': break if flag & FHCRC: input.read(2) # Read & discard the 16-bit header CRC decompobj = zlib.decompressobj(-zlib.MAX_WBITS) - crcval = zlib.crc32("") + crcval = zlib.crc32(b'') length = 0 while True: - data=input.read(1024) - if data == "": + data = input.read(1024) + if data == b"": break decompdata = decompobj.decompress(data) output.write(decompdata) |