Xbase++

Decompress Gzip Data In-Place Using BinData

See more Gzip Examples

This example demonstrates how to use the UncompressBd method to decompress Gzip data stored in a BinData object.

The compressed .gz file is first loaded into memory. The UncompressBd method then decompresses the data in-place, meaning the original compressed bytes in the BinData object are replaced with the uncompressed data.

After decompression, the example writes the resulting data to a file. This approach is useful when working entirely in memory before saving or further processing the uncompressed data.

Xbase++

LOCAL nSuccess
LOCAL oGzip
LOCAL oBd

nSuccess := 0

//  This example demonstrates how to decompress Gzip data stored in a BinData object.
//  The decompression is done in-place, replacing the compressed data with the original data.

oGzip := CreateObject("Chilkat.Gzip")
oBd := CreateObject("Chilkat.BinData")

//  Load a .gz file into BinData:
nSuccess := oBd:LoadFile("example.txt.gz")
IF (nSuccess == 0)
    ? oBd:LastErrorText
    oGzip:destroy()
    oBd:destroy()
    RETURN
ENDIF

? "Compressed size (bytes): " + Str(oBd:NumBytes)

//  Uncompress the data in-place:
nSuccess := oGzip:UncompressBd(oBd)
IF (nSuccess == 0)
    ? oGzip:LastErrorText
    oGzip:destroy()
    oBd:destroy()
    RETURN
ENDIF

? "Decompressed size (bytes): " + Str(oBd:NumBytes)

//  Save the uncompressed data to a file:
nSuccess := oBd:WriteFile("example.txt")
IF (nSuccess == 0)
    ? oBd:LastErrorText
    oGzip:destroy()
    oBd:destroy()
    RETURN
ENDIF

? "File successfully uncompressed to example.txt"

oGzip:destroy()
oBd:destroy()