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(AutoIt) Compress and Encrypt a Large File (Low and Constant Memory Footprint)See more Compression ExamplesDemonstrates how to compress and encrypt a large file such that the memory footprint remains low and constant. Note: This example requires Chilkat v9.5.0.99 or greater.
; This example assumes the Chilkat API to have been previously unlocked. ; See Global Unlock Sample for sample code. $oCompress = ObjCreate("Chilkat_9_5_0.Compression") $oCompress.Algorithm = "deflate" Local $bSuccess ; Set encryption params. ; The possible values are the same as for the corresponding properties in the Chilkat Crypt2 class/object. ; The encoded IV and Key must be specified as hex. $oJson = ObjCreate("Chilkat_9_5_0.JsonObject") $oJson.UpdateString("cryptAlgorithm","aes") $oJson.UpdateString("cipherMode","cbc") $oJson.UpdateInt("keyLength",128) $oJson.UpdateInt("paddingScheme",0) $oJson.UpdateString("encodedIV","000102030405060708090A0B0C0D0E0F") $oJson.UpdateString("encodedKey","000102030405060708090A0B0C0D0E0F") ; Do file-to-file compression+encryption in a single call. Local $sInPath = "qa_data/largeFile.dat" Local $sOutPath = "c:/temp/qa_output/compressed_encrypted.dat" $bSuccess = $oCompress.CompressEncryptFile($oJson,$sInPath,$sOutPath) If ($bSuccess = False) Then ConsoleWrite($oCompress.LastErrorText & @CRLF) Exit EndIf ; We can do file-to-file decrypt/decompress like this: Local $sInPath2 = $sOutPath Local $sOutPath2 = "c:/temp/qa_output/restored.dat" $bSuccess = $oCompress.DecryptDecompressFile($oJson,$sInPath2,$sOutPath2) If ($bSuccess = False) Then ConsoleWrite($oCompress.LastErrorText & @CRLF) Exit EndIf ; Note: The above decrypt + decompress is the equivalent of doing the same in these two steps: $oCrypt = ObjCreate("Chilkat_9_5_0.Crypt2") $oCrypt.CryptAlgorithm = "aes" $oCrypt.CipherMode = "cbc" $oCrypt.KeyLength = 128 $oCrypt.PaddingScheme = 0 $oCrypt.SetEncodedIV "000102030405060708090A0B0C0D0E0F","hex" $oCrypt.SetEncodedKey "000102030405060708090A0B0C0D0E0F","hex" Local $sDecryptedPath = "c:/temp/qa_output/decrypted.dat" $bSuccess = $oCrypt.CkDecryptFile($sInPath2,$sDecryptedPath) If ($bSuccess = False) Then ConsoleWrite($oCrypt.LastErrorText & @CRLF) Exit EndIf Local $sOutPath3 = "c:/temp/qa_output/restored_in_two_steps.dat" $bSuccess = $oCompress.DecompressFile($sDecryptedPath,$sOutPath3) If ($bSuccess = False) Then ConsoleWrite($oCompress.LastErrorText & @CRLF) Exit EndIf ConsoleWrite("Success." & @CRLF) |
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