Uploaded Test files

venv/Lib/site-packages/win32/Demos/BackupRead_BackupWrite.py

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