If you want to encode base64 on iPhone SDK you can try the next code snippet:
(NSString )decodeBase64:(NSString )input {
NSString alphabet = @"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+-";
NSString decoded = @"";
NSString *encoded = [input stringByPaddingToLength:(ceil([input length] / 4) * 4) withString:@"A" startingAtIndex:0];
int i; char a, b, c, d; UInt32 z;
for(i = 0; i < [encoded length]; i += 4) {
a = [alphabet rangeOfString:[encoded substringWithRange:NSMakeRange(i + 0, 1)]].location;
b = [alphabet rangeOfString:[encoded substringWithRange:NSMakeRange(i + 1, 1)]].location;
c = [alphabet rangeOfString:[encoded substringWithRange:NSMakeRange(i + 2, 1)]].location;
d = [alphabet rangeOfString:[encoded substringWithRange:NSMakeRange(i + 3, 1)]].location;
z = ((UInt32)a << 26) + ((UInt32)b << 20) + ((UInt32)c << 14) + ((UInt32)d << 8);
decoded = [decoded stringByAppendingString:[NSString stringWithCString:(char *)&z]]; }
return decoded; }
The following code converts an NS Data Object to a base64 string:
(NSString )base64Encoding { NSTask task = [NSTask alloc] init] autorelease];
NSPipe inPipe = [NSPipe pipe], outPipe = [NSPipe pipe];
NSFileHandle inHandle = [inPipe fileHandleForWriting], outHandle = [outPipe fileHandleForReading];
NSData *outData = nil;
[task setLaunchPath:@"/usr/bin/openssl"];
[task setArguments:[NSArray arrayWithObjects:@"base64", @"-e", nil;
[task setStandardInput:inPipe];
[task setStandardOutput:outPipe];
[task setStandardError:outPipe];
[task launch];
[inHandle writeData:self]; [inHandle closeFile];
[task waitUntilExit];
outData = [outHandle readDataToEndOfFile];
if (outData) {
NSString *base64 = [NSString alloc] initWithData:outData encoding:NSUTF8StringEncoding] autorelease];
if (base64) return base64;
}
return nil; }
