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Compress and Decompress Hex String

See more Compression Examples

Imagine we have data represented as a hex string. This example demonstrates how to decode, compress, and re-encode to a smaller hex string representing the compressed data. An even better choice is to re-encode to a more compact encoding such as base64.

Note: This example requires Chilkat v9.5.0.66 or greater.

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Local $bSuccess = False

; This example assumes the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

Local $strHex = "54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A0D0A"

$oCompress = ObjCreate("Chilkat.Compression")
$oCompress.Algorithm = "deflate"

$oBinDat = ObjCreate("Chilkat.BinData")
; Load the hex string into a BinData object.
; This decodes the hexidecimal. The decoded bytes will be contained in the BinData.
$oBinDat.AppendEncoded($strHex,"hex")

; Compress the BinData.
$oCompress.CompressBd($oBinDat)

; Get the compressed data in hex format:
Local $sCompressedHex = $oBinDat.GetEncoded("hex")
ConsoleWrite("compressed hex:" & @CRLF)
ConsoleWrite($sCompressedHex & @CRLF)

; The compressed hex is: 0BC94855282CCD4CCE56482ACA2FCF5348CBAF50C82ACD2D484D51C82F4B2D522801CAE72456552AA4E4A7EBF172850C61E5BC5C00

; Even better, get the compressed data in base64 format:
; (base64url and modbase64 are other valid choices...)
Local $sCompressedBase64 = $oBinDat.GetEncoded("base64")
ConsoleWrite("compressed base64:" & @CRLF)
ConsoleWrite($sCompressedBase64 & @CRLF)

; The compressed base64 is: C8lIVSgszUzOVkgqyi/PU0jLr1DIKs0tSE1RyC9LLVIoAcrnJFZVKqTkp+vxcoUMYeW8XAA=

; Now decompress:
$oBinDat.Clear()
$oBinDat.AppendEncoded($sCompressedHex,"hex")
$oCompress.DecompressBd($oBinDat)

Local $sDecompressedHex = $oBinDat.GetEncoded("hex")
ConsoleWrite("decompressed hex:" & @CRLF)
ConsoleWrite($sDecompressedHex & @CRLF)

; The output is the original hex string:
; 54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A54686520717569636B2062726F776E20666F78206A756D706564206F76657220746865206C617A7920646F672E0D0A0D0A