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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.

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llSuccess = .F.

// 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.

loGzip = createobject("CkGzip")
loBd = createobject("CkBinData")

// Load a .gz file into BinData:
llSuccess = loBd.LoadFile("example.txt.gz")
if (llSuccess = .F.) then
    ? loBd.LastErrorText
    release loGzip
    release loBd
    return
endif

? "Compressed size (bytes): " + str(loBd.NumBytes)

// Uncompress the data in-place:
llSuccess = loGzip.UncompressBd(loBd)
if (llSuccess = .F.) then
    ? loGzip.LastErrorText
    release loGzip
    release loBd
    return
endif

? "Decompressed size (bytes): " + str(loBd.NumBytes)

// Save the uncompressed data to a file:
llSuccess = loBd.WriteFile("example.txt")
if (llSuccess = .F.) then
    ? loBd.LastErrorText
    release loGzip
    release loBd
    return
endif

? "File successfully uncompressed to example.txt"


release loGzip
release loBd