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##############################################################################
#
# Copyright (c) 1996-1998, Digital Creations, Fredericksburg, VA, USA.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# o Redistributions of source code must retain the above copyright
# notice, this list of conditions, and the disclaimer that follows.
#
# o Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions, and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
#
# o Neither the name of Digital Creations nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
#
# THIS SOFTWARE IS PROVIDED BY DIGITAL CREATIONS AND CONTRIBUTORS *AS IS*
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL DIGITAL
# CREATIONS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
# DAMAGE.
#
#
# If you have questions regarding this software, contact:
#
# Digital Creations, L.C.
# 910 Princess Ann Street
# Fredericksburge, Virginia 22401
#
# info@digicool.com
#
# (540) 371-6909
#
##############################################################################
__doc__='''Version 2 to version 3 file conversion routines.
$Id: SimpleDB23.py,v 1.5 1998/10/23 21:43:02 jim Exp $'''
__version__='$Revision: 1.5 $'[11:-2]
from SimpleDB import * # I'm a lazy bum.
def convert23(file,file_name):
import os
dest_name=file_name+'.v3'
dest=open(dest_name,'wb')
convert23_(file,dest)
file.close()
dest.close()
os.rename(file_name, file_name+'.v2')
os.rename(dest_name, file_name)
def convert23_(src,dest, debug=None):
"""\
Copy a MultipleRevision Rev 2.0 simple database
Also getting rid of unwanted records.
This is harder than it at first appears due to the simple format
of the file. I can't know till fairly late in the game whether a
record should appear in the output. I actually have to build up a
list of records to be kept and then sort these before wring the
file. :-(.
""" #'
kept_records=[]
index={}
dpos=pos=len(MultipleRevision.packed_version2)
hs2=len(pack("iidi",0,0,0.0,0))
sseek=src.seek
dseek=dest.seek
read=src.read
write=dest.write
while 1:
sseek(pos)
h=read(hs2)
if len(h) != hs2: break
oid,prev,start,plen=unpack("iidi",h)
if debug: debug("r %d: %d %16.16g %d\n" %
(src.tell(),oid,start,plen))
newpos=pos+hs2+plen
if oid:
if prev: kept_records.append(index[oid])
index[oid]=start,pos
pos=newpos
kept_records=kept_records+index.values()
index={}
kept_records.sort()
dseek(0)
write(MultipleRevision.packed_version)
for start,pos in kept_records:
sseek(pos)
h=read(hs2)
oid,prev,start,plen=unpack("iidi",h)
tlen=28+plen
p=read(plen)
if plen==0:
plen=-1
try: prev=index[oid]
except: prev=0
h=pack(">iidii",oid,prev,start,tlen,plen)
dseek(dpos)
write(h)
write(p)
write(h[16:20])
dpos=dpos+tlen
dest.flush()
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