Snippets
Created by
Alexander Hanel
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# quick hack for using aplib (http://www.ibsensoftware.com/products_aPLib.html)
# put aplib.dll in %PATH% or same dir as this script
# on *nix it might require LD_LIBRARY_PATH set depending on where libaplib.so is
#
# 20161001 - added 'dnh' option to decompress data with no aplib header - alexander hanel
import os
from ctypes import *
################################################################################
__all__ = [ 'pack', 'pack_safe', 'depack', 'depack_safe', 'CB_COMPRESS']
################################################################################
if os.name == 'nt':
CB_COMPRESS = WINFUNCTYPE(c_uint, c_uint, c_uint, c_uint, c_void_p)
_aplib = windll.aplib
else:
CB_COMPRESS = CFUNCTYPE(c_uint, c_uint, c_uint, c_uint, c_void_p)
# might require LD_LIBRARY_PATH set
_aplib = CDLL("libaplib.so")
def _ratio(inpos, insize):
return (inpos * 100) / insize
def _cbCompress(insize, inpos, outpos, cbparam):
print "compressed %u -> %u bytes (%u%% done)" % \
( inpos, outpos, _ratio(inpos, insize))
return 1
_cbCompressFunc = CB_COMPRESS(_cbCompress)
################################################################################
def pack(src, cb=None):
srclen = len(src)
if srclen <= 0:
raise ValueError('Invalid input.')
dstlen = _aplib.aP_max_packed_size(srclen)
dst = create_string_buffer(dstlen)
wrkmem = create_string_buffer(_aplib.aP_workmem_size(srclen))
dstlen = _aplib.aP_pack(src, dst, srclen, wrkmem, cb, 0)
if dstlen == -1:
raise ValueError('Compression error.')
return buffer(dst, 0, dstlen)
def pack_safe(src, cb=None):
srclen = len(src)
if srclen <= 0:
raise ValueError('Invalid input.')
dstlen = _aplib.aP_max_packed_size(srclen)
dst = create_string_buffer(dstlen)
wrkmem = create_string_buffer(_aplib.aP_workmem_size(srclen))
dstlen = _aplib.aPsafe_pack(src, dst, srclen, wrkmem, cb, 0)
if dstlen == -1:
raise ValueError('Compression error.')
return buffer(dst, 0, dstlen)
################################################################################
def depack(src, dstlen):
srclen = len(src)
if srclen <= 0 or dstlen <= 0:
raise ValueError('Invalid input.')
dst = create_string_buffer(dstlen)
dstlen = _aplib.aP_depack_asm_safe(src, srclen, dst, dstlen)
if dstlen == -1:
raise ValueError('Decompression error.')
return buffer(dst, 0, dstlen)
def depack_safe(src):
srclen = len(src)
if srclen <= 0:
raise ValueError('Invalid input.')
dstlen = _aplib.aPsafe_get_orig_size(src)
dst = create_string_buffer(dstlen)
dstlen = _aplib.aPsafe_depack(src, srclen, dst, dstlen)
if dstlen == -1:
raise ValueError('Decompression error.')
return buffer(dst, 0, dstlen)
def depack_no_header(src):
# uses aP_depack_asm_fast to decompress buffer
srclen = len(src)
# probably could allocate less but don't really care
dstlen = 50 * srclen
if srclen <= 0 or dstlen <= 0:
raise ValueError('Invalid input.')
dst = create_string_buffer(dstlen)
dstlen = _aplib.aP_depack_asm_fast(src, dst)
if dstlen == -1:
raise ValueError('Decompression error.')
return buffer(dst, 0, dstlen)
################################################################################
if __name__ == "__main__":
import optparse
parser = optparse.OptionParser(
usage='%prog [-h] [-v] -m c|d infile outfile'
)
parser.add_option(
'-m', '--mode',
action="store",
type="string",
dest='mode',
help='c for compress, d for decompress')
parser.add_option(
'-v', '--verbose',
action="store_true",
dest='verbose')
options, args = parser.parse_args()
if not options.mode in ['c', 'd', 'dnh']:
parser.error('You must give a valid --mode')
if not len(args) == 2:
parser.error('You must give in- and outfile')
infile = args[0]
outfile = args[1]
src = open(infile, 'rb').read()
if options.mode == 'c':
print "Compressing '%s' to '%s'" % (infile, outfile)
if options.verbose:
dst = pack_safe(src, _cbCompressFunc)
else:
print "called"
dst = pack_safe(src)
open(outfile, 'wb').write(dst)
print "Compressed '%s' from %u to %u bytes (%u%%)" \
% (infile, len(src), len(dst), _ratio(len(dst), len(src)))
elif options.mode == 'd':
print "Decompressing '%s' to '%s'" % (infile, outfile)
dst = depack_safe(src)
open(outfile, 'wb').write(dst)
print "Decompressed '%s' from %u to %u bytes (%u%%)" \
% (infile, len(src), len(dst), _ratio(len(dst), len(src)))
elif options.mode == 'dnh':
print "Decompressing '%s' to '%s'" % (infile, outfile)
dst = depack_no_header(src)
open(outfile, 'wb').write(dst)
print "Decompressed '%s' from %u to %u bytes (%u%%)" \
% (infile, len(src), len(dst), _ratio(len(dst), len(src)))
################################################################################
|
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