82 lines
3.5 KiB
Python
82 lines
3.5 KiB
Python
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## demonstrates using BackupRead and BackupWrite to copy all of a file's data streams
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import win32file, win32api, win32con, win32security, ntsecuritycon
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from win32com import storagecon
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import pythoncom, pywintypes
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import struct, traceback
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from pywin32_testutil import str2bytes, ob2memory
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all_sd_info=win32security.DACL_SECURITY_INFORMATION|win32security.DACL_SECURITY_INFORMATION| \
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win32security.OWNER_SECURITY_INFORMATION|win32security.GROUP_SECURITY_INFORMATION
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tempdir=win32api.GetTempPath()
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tempfile=win32api.GetTempFileName(tempdir,'bkr')[0]
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outfile=win32api.GetTempFileName(tempdir,'out')[0]
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print('Filename:',tempfile,'Output file:',outfile)
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f=open(tempfile,'w')
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f.write('some random junk'+'x'*100)
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f.close()
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## add a couple of alternate data streams
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f=open(tempfile+':streamdata','w')
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f.write('data written to alternate stream'+'y'*100)
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f.close()
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f=open(tempfile+':anotherstream','w')
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f.write('z'*100)
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f.close()
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## add Summary Information, which is stored as a separate stream
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m=storagecon.STGM_READWRITE | storagecon.STGM_SHARE_EXCLUSIVE |storagecon.STGM_DIRECT
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pss=pythoncom.StgOpenStorageEx(tempfile, m, storagecon.STGFMT_FILE, 0 , pythoncom.IID_IPropertySetStorage,None)
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ps=pss.Create(pythoncom.FMTID_SummaryInformation,pythoncom.IID_IPropertyStorage,0,storagecon.STGM_READWRITE|storagecon.STGM_SHARE_EXCLUSIVE)
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ps.WriteMultiple((storagecon.PIDSI_KEYWORDS,storagecon.PIDSI_COMMENTS),('keywords','comments'))
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ps=None
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pss=None
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## add a custom security descriptor to make sure we don't
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## get a default that would always be the same for both files in temp dir
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new_sd=pywintypes.SECURITY_DESCRIPTOR()
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sid=win32security.LookupAccountName('','EveryOne')[0]
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acl=pywintypes.ACL()
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acl.AddAccessAllowedAce(1, win32con.GENERIC_READ, sid)
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acl.AddAccessAllowedAce(1, ntsecuritycon.FILE_APPEND_DATA, sid)
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acl.AddAccessAllowedAce(1, win32con.GENERIC_WRITE, sid)
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acl.AddAccessAllowedAce(1, ntsecuritycon.FILE_ALL_ACCESS, sid)
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new_sd.SetSecurityDescriptorDacl(True, acl, False)
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win32security.SetFileSecurity(tempfile,win32security.DACL_SECURITY_INFORMATION,new_sd)
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sa=pywintypes.SECURITY_ATTRIBUTES()
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sa.bInheritHandle=True
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h=win32file.CreateFile(tempfile, win32con.GENERIC_ALL ,win32con.FILE_SHARE_READ,
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sa, win32con.OPEN_EXISTING, win32file.FILE_FLAG_BACKUP_SEMANTICS , None)
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outh=win32file.CreateFile(outfile, win32con.GENERIC_ALL ,win32con.FILE_SHARE_READ|win32con.FILE_SHARE_WRITE,
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sa, win32con.OPEN_EXISTING, win32file.FILE_FLAG_BACKUP_SEMANTICS , None)
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ctxt=0
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outctxt=0
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buf=None
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readsize=100
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while 1:
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bytes_read, buf, ctxt=win32file.BackupRead(h, readsize, buf, False, True, ctxt)
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if bytes_read==0:
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break
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bytes_written, outctxt=win32file.BackupWrite(outh, bytes_read, buf, False, True, outctxt)
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print('Written:',bytes_written,'Context:',outctxt)
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win32file.BackupRead(h, 0, buf, True, True, ctxt)
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win32file.BackupWrite(outh, 0, str2bytes(''), True, True, outctxt)
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win32file.CloseHandle(h)
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win32file.CloseHandle(outh)
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assert open(tempfile).read()==open(outfile).read(),"File contents differ !"
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assert open(tempfile+':streamdata').read()==open(outfile+':streamdata').read(),"streamdata contents differ !"
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assert open(tempfile+':anotherstream').read()==open(outfile+':anotherstream').read(),"anotherstream contents differ !"
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assert ob2memory(win32security.GetFileSecurity(tempfile,all_sd_info))[:]== \
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ob2memory(win32security.GetFileSecurity(outfile, all_sd_info))[:], "Security descriptors are different !"
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## also should check Summary Info programatically
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