| #Notes for developing compression spec. |
| |
| # Python zlib snippets # |
| |
| Sync flush (empty uncompressed block) |
| ``` |
| import zlib |
| c = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -zlib.MAX_WBITS) |
| b = c.compress('abcdefghijklmnopqrstuvwxyz') |
| b += c.flush(zlib.Z_SYNC_FLUSH) |
| b |
| ``` |
| |
| Finish with BFINAL |
| ``` |
| import zlib |
| c = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -zlib.MAX_WBITS) |
| b = c.compress('abcdefghijklmnopqrstuvwxyz') |
| b += c.flush(zlib.Z_FINISH) |
| b |
| ``` |
| |
| Hex printing |
| ``` |
| ' '.join(map(lambda x: '0x%02x' % ord(x), b)) |
| ``` |
| |
| Decompress |
| ``` |
| import zlib |
| d = zlib.decompressobj(-zlib.MAX_WBITS) |
| max_length = 1 |
| d.decompress(b, max_length) |
| d.decompress(d.unconsumed_tail) |
| d.unconsumed_tail |
| ``` |
