(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_CkGzip.h>
#include <C_CkBinData.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkGzip gzip;
    HCkBinData 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 = CkGzip_Create();
    bd = CkBinData_Create();

    // Load a .gz file into BinData:
    success = CkBinData_LoadFile(bd,"example.txt.gz");
    if (success == FALSE) {
        printf("%s\n",CkBinData_lastErrorText(bd));
        CkGzip_Dispose(gzip);
        CkBinData_Dispose(bd);
        return;
    }

    printf("Compressed size (bytes): %d\n",CkBinData_getNumBytes(bd));

    // Uncompress the data in-place:
    success = CkGzip_UncompressBd(gzip,bd);
    if (success == FALSE) {
        printf("%s\n",CkGzip_lastErrorText(gzip));
        CkGzip_Dispose(gzip);
        CkBinData_Dispose(bd);
        return;
    }

    printf("Decompressed size (bytes): %d\n",CkBinData_getNumBytes(bd));

    // Save the uncompressed data to a file:
    success = CkBinData_WriteFile(bd,"example.txt");
    if (success == FALSE) {
        printf("%s\n",CkBinData_lastErrorText(bd));
        CkGzip_Dispose(gzip);
        CkBinData_Dispose(bd);
        return;
    }

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


    CkGzip_Dispose(gzip);
    CkBinData_Dispose(bd);

    }