(Objective-C) Compress Text Feed to Binary

This example receives incoming text data in chunks, compresses as a stream, and accumulates the compressed binary data.

The purpose is to demonstrate the BeginCompressString, MoreCompressString, and EndCompressString methods.

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

#import <CkoBinData.h>
#import <CkoCompression.h>
#import <CkoStringBuilder.h>
#import <NSString.h>

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

BOOL success;
CkoBinData *compressedData = [[CkoBinData alloc] init];
NSData compressedBytes;

CkoCompression *compress = [[CkoCompression alloc] init];
compress.Algorithm = @"deflate";
compress.Charset = @"utf-8";

CkoStringBuilder *sbIndex = [[CkoStringBuilder alloc] init];

int i;
for (i = 0; i <= 24; i++) {
    // Note: It is possible (and normal) for a BeginCompress* or MoreCompress* method to return
    // an empty string (or 0 bytes).  When this happens, the input data is not lost.  It will be flushed
    // in a subsequent call.
    [sbIndex Clear];
    [sbIndex AppendInt: [NSNumber numberWithInt: i]];
    if (i == 0) {
        compressedBytes = [compress BeginCompressString: [sbIndex GetAsString]];
    }
    else {
        compressedBytes = [compress MoreCompressString: [sbIndex GetAsString]];
    }

    [compressedData AppendBinary: compressedBytes];
    compressedBytes = [compress MoreCompressString: @": This is a line of data to be compressed...\r\n"];
    [compressedData AppendBinary: compressedBytes];
}

// Flush any remaining output.
compressedBytes = [compress EndCompressString];
[compressedData AppendBinary: compressedBytes];

// Show the compressed data in hex format:
NSLog(@"%@",@"The hex encoded compressed text:");
NSLog(@"%@",[compressedData GetEncoded: @"hex"]);

// Now decompress in one call:
compressedBytes = [compressedData GetBinary];
NSString *originalText = [compress DecompressString: compressedBytes];
NSLog(@"%@",originalText);