(Unicode C) 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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#include <C_CkGzipW.h>
#include <C_CkBinDataW.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkGzipW gzip;
    HCkBinDataW bd;

    success = FALSE;

    // 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.

    gzip = CkGzipW_Create();
    bd = CkBinDataW_Create();

    // Load a .gz file into BinData:
    success = CkBinDataW_LoadFile(bd,L"example.txt.gz");
    if (success == FALSE) {
        wprintf(L"%s\n",CkBinDataW_lastErrorText(bd));
        CkGzipW_Dispose(gzip);
        CkBinDataW_Dispose(bd);
        return;
    }

    wprintf(L"Compressed size (bytes): %d\n",CkBinDataW_getNumBytes(bd));

    // Uncompress the data in-place:
    success = CkGzipW_UncompressBd(gzip,bd);
    if (success == FALSE) {
        wprintf(L"%s\n",CkGzipW_lastErrorText(gzip));
        CkGzipW_Dispose(gzip);
        CkBinDataW_Dispose(bd);
        return;
    }

    wprintf(L"Decompressed size (bytes): %d\n",CkBinDataW_getNumBytes(bd));

    // Save the uncompressed data to a file:
    success = CkBinDataW_WriteFile(bd,L"example.txt");
    if (success == FALSE) {
        wprintf(L"%s\n",CkBinDataW_lastErrorText(bd));
        CkGzipW_Dispose(gzip);
        CkBinDataW_Dispose(bd);
        return;
    }

    wprintf(L"File successfully uncompressed to example.txt\n");


    CkGzipW_Dispose(gzip);
    CkBinDataW_Dispose(bd);

    }