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

Use Data, read http://stackoverflow.com/questions/39515173/how-to-use-unsafemutablepointer-in-swift-3 — Ludovic, Jan 06 '17 at 08:58
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, Jan 06 '17 at 11:38

score 15 · Answer 1 · answered Jan 06 '17 at 09:03

15

You can convert bytes array to base64String by using following way

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

answered Jan 06 '17 at 09:03

Usman Javed

2,437
1
17
26

What 'type' is the data object in this example? – metamonkey Aug 26 '21 at 22:18

score -1 · Answer 2 · edited Aug 14 '22 at 06:14

-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 '22 at 06:14

Mark A. Donohoe

28,442
25
137
286

answered Nov 30 '20 at 08:45

Kiran Patil

402
5
13

"Extraneous argument label 'base64:' in call" given for example 2 – metamonkey Aug 26 '21 at 22:12
can you include the `.toBase64()` function definition or documentation of where it came from – micah Nov 30 '22 at 13:15

How to convert byte array to base64 string in swift?

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