I am supposed to convert a file in to Base64 and add that String to a JSON which I am appending to a URL. The files that I am having are a .zip file and a text file with .info extension. The .info file is uploading correctly but with .zip file I am getting "Incorrect Padding" error as response from the server.
Below is my work;
- (void)uploadingData: (NSString *)fileName {
NSArray *directoryPathsArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [directoryPathsArray objectAtIndex:0];
NSString *absoluteFilePath = [NSString stringWithFormat:@"%@/%@/%@", documentsDirectory, baseDirName, fileName];
NSInputStream *inputStream = [NSInputStream inputStreamWithFileAtPath:absoluteFilePath];
[inputStream open];
uint8_t buffer[1024];
int len;
NSMutableString *total = [[NSMutableString alloc] init];
while ([inputStream hasBytesAvailable]) {
len = [inputStream read:buffer maxLength:sizeof(buffer)];
if (len > 0) {
[total appendString: [[NSString alloc] initWithBytes:buffer length:len encoding:NSASCIIStringEncoding]];
}
}
NSData *plainData = [total dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64String = [plainData base64EncodedStringWithOptions:0];
// Adding to JSON and upload goes here.
}
Where I have done the mistake?
Additionally, is there a way I can check the converted string is exactly according to Base64, before it append to JSON and upload to server?
Thanks
I have found the mistakes as well as the answer. I do not need to convert the .zip file in to NSInputStream and I haven't applied URL safe methods to the encoded string. Following is the way I have tackled it.
- (void)uploadingData: (NSString *)fileName {
NSArray *directoryPathsArray = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [directoryPathsArray objectAtIndex:0];
NSString *absoluteFilePath = [NSString stringWithFormat:@"%@/%@/%@", documentsDirectory, baseDirName, fileName];
NSData *zipFileData = [NSData dataWithContentsOfFile:absoluteFilePath];
NSString *base64String = [zipFileData base64EncodedStringWithOptions:0];
base64String = [base64String stringByReplacingOccurrencesOfString:@"/"
withString:@"_"];
base64String = [base64String stringByReplacingOccurrencesOfString:@"+"
withString:@"-"];
// Adding to JSON and upload goes here.
}
In Android there is a way to do both Base64 encoding and URL safe formatting with a single function.
byte[] bytes = Files.toByteArray(new File(sFileName));
byte[] encoded = Base64.encodeBase64URLSafe(bytes);
I have no idea whether there is a similar kind of easy way of doing it with iOS too.