(Objective-C) Stream a file to compression to encryption to an output file.

Runs a chain of streams to read a source file, compress, encrypt, and write an output file.

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#import <CkoCompression.h>
#import <CkoCrypt2.h>
#import <NSString.h>
#import <CkoStream.h>
#import <CkoTask.h>
#import <CkoBinData.h>

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

BOOL success;

// Initialize the compression object.
CkoCompression *compress = [[CkoCompression alloc] init];
compress.Algorithm = @"deflate";

// Initialize the encryption object.
CkoCrypt2 *crypt = [[CkoCrypt2 alloc] init];
crypt.CryptAlgorithm = @"chacha20";
crypt.KeyLength = [NSNumber numberWithInt:256];
crypt.EncodingMode = @"hex";
NSString *ivHex = @"000000000000000000000002";
[crypt SetEncodedIV: ivHex encoding: @"hex"];
crypt.InitialCount = [NSNumber numberWithInt:42];
NSString *keyHex = @"1c9240a5eb55d38af333888604f6b5f0473917c1402b80099dca5cbc207075c0";
[crypt SetEncodedKey: keyHex encoding: @"hex"];

// Setup the streams.  
// streamC is for compression
CkoStream *streamC = [[CkoStream alloc] init];
// streamE is for encryption
CkoStream *streamE = [[CkoStream alloc] init];

// The source for the compressor is a file.
streamC.SourceFile = @"qa_data/hamlet.xml";
// The source for the encryptor is the output of the compressor stream.
success = [streamE SetSourceStream: streamC];

// The sink for the encryptor is the output file.
streamE.SinkFile = @"qa_output/compressed_encrypted.dat";

// Start the compression and encryption streams in background threads..
CkoTask *taskC = [compress CompressStreamAsync: streamC];
CkoTask *taskE = [crypt EncryptStreamAsync: streamE];
success = [taskC Run];
success = [taskE Run];

// Let the streams run until finished.
// Let's make sure the background task finished.
// It should already be the case that the task is finished.
while (((taskE.Finished != YES) || (taskC.Finished != YES))) {
    [taskE SleepMs: [NSNumber numberWithInt: 20]];
}

// check for success..
if (taskE.TaskSuccess != YES) {
    NSLog(@"%@",@"async encryption failed:");
    NSLog(@"%@",taskE.ResultErrorText);
    success = NO;
}

// check for success..
if (taskC.TaskSuccess != YES) {
    NSLog(@"%@",@"async compression failed:");
    NSLog(@"%@",taskC.ResultErrorText);
    success = NO;
}

// Load the file that was produced and decrypt/decompress to verify.
CkoBinData *binData = [[CkoBinData alloc] init];
success = [binData LoadFile: @"qa_output/compressed_encrypted.dat"];
success = [crypt DecryptBd: binData];
success = [compress DecompressBd: binData];

// binData should contain the original data..
success = [binData WriteFile: @"qa_output/original_hamlet.xml"];

NSLog(@"%@",@"Finished.");