(Objective-C) Decompress Gzip Data In-Place Using BinData

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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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#import <CkoGzip.h>
#import <CkoBinData.h>

BOOL success = NO;

// 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.

CkoGzip *gzip = [[CkoGzip alloc] init];
CkoBinData *bd = [[CkoBinData alloc] init];

// Load a .gz file into BinData:
success = [bd LoadFile: @"example.txt.gz"];
if (success == NO) {
    NSLog(@"%@",bd.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Compressed size (bytes): ",[bd.NumBytes intValue]);

// Uncompress the data in-place:
success = [gzip UncompressBd: bd];
if (success == NO) {
    NSLog(@"%@",gzip.LastErrorText);
    return;
}

NSLog(@"%@%d",@"Decompressed size (bytes): ",[bd.NumBytes intValue]);

// Save the uncompressed data to a file:
success = [bd WriteFile: @"example.txt"];
if (success == NO) {
    NSLog(@"%@",bd.LastErrorText);
    return;
}

NSLog(@"%@",@"File successfully uncompressed to example.txt");