How to convert byte array to base64 string in swift?

Question

Here is my sample code in objective C

 -(NSString *)getImageString : (unsigned char *) charValue : (unsigned long) sizeOfBytes {                   

    uint8_t commandbyte[]={ };          

    uint8_t _allBytes[(sizeOfBytes + sizeof(commandbyte))];
    memcpy(_allBytes, charValue, sizeOfBytes);

    NSMutableData *ImageData = [[NSMutableData alloc]init];
    [ImageData appendBytes:_allBytes length:sizeof(_allBytes)];

    NSString *base64String=[self base64forData:ImageData];

    return base64String;                     
}                  

- (NSString*)base64forData:(NSData*)theData {           

    const uint8_t* input = (const uint8_t*)[theData bytes];
    NSInteger length = [theData length];

    static char table[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

    NSMutableData* data = [NSMutableData dataWithLength:((length + 2) / 3) * 4];
    uint8_t* output = (uint8_t*)data.mutableBytes;

    NSInteger i;
    for (i=0; i < length; i += 3) {
        NSInteger value = 0;
        NSInteger j;

        for (j = i; j < (i + 3); j++) {
            value <<= 8;

            if (j < length) {
                value |= (0xFF & input[j]);
            }
        }

        NSInteger theIndex = (i / 3) * 4;
        output[theIndex + 0] = table[(value >> 18) & 0x3F];
        output[theIndex + 1] = table[(value >> 12) & 0x3F];
        output[theIndex + 2] = (i + 1) < length ? table[(value >> 6)  & 0x3F] : '=';
        output[theIndex + 3] = (i + 2) < length ? table[(value >> 0)  & 0x3F] : '=';
    }

    return [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
}

In this example i used to get the bytes using the sizeOfBytes and then appendBytes to NSMutableData.

Below method is used to convert data to base64:

- (NSString*)base64forData:(NSData*)theData

It is very simple in objective C, but when i tried in swift there other concepts for pointers like UnsafeMutablePointer, UnsafePointer etc.

How to convert to swift 3.0 ??

Can you Guys please suggest me the usage of pointers in swift

What's your actual purpose? You want to practice how to work with Swift Data and pointers, even if you know you can use the base64EncodedString method? — OOPer
– OOPer, Commented Jan 6, 2017 at 11:38

Usman Javed · Accepted Answer · 2017-01-06 09:03:12Z

14

You can convert bytes array to base64String by using following way

let base64String = data!.base64EncodedString(options: NSData.Base64EncodingOptions(rawValue: 0))

answered Jan 6, 2017 at 9:03

Usman Javed

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1 Comment

metamonkey Over a year ago

What 'type' is the data object in this example?

Mark A. Donohoe · Accepted Answer · 2022-08-14 06:14:55Z

-1

Swift 5 Convert bytes array to base64String using following ways

Example 1

let plainText = "Hello world!"
print("Plain Text:", plainText)
print("Base64String:", Array(plainText.utf8).toBase64()!)

Output Example 1

Plain Text: Hello world!
Base64String: SGVsbG8gd29ybGQh

Example 2

let ivBase64str = "AbcnmWikMkW4c7+mHtwtfw=="
let iv = [UInt8](base64: ivBase64str)
print("BytesArray:", iv)
print("Base64String:", iv.toBase64()!)

Output Example 2

BytesArray: [1, 183, 39, 153, 104, 164, 50, 69, 184, 115, 191, 166, 30, 220, 45, 127]
Base64String: AbcnmWikMkW4c7+mHtwtfw==

edited Aug 14, 2022 at 6:14

Mark A. Donohoe

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answered Nov 30, 2020 at 8:45

Kiran Patil

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2 Comments

metamonkey Over a year ago

"Extraneous argument label 'base64:' in call" given for example 2

micah Over a year ago

can you include the .toBase64() function definition or documentation of where it came from

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