static NSRange _RangeForRequest()

in Source/TNLPseudoURLProtocol.m [453:477]

• 24 lines of code
• 9 McCabe index (conditional complexity)

static NSRange _RangeForRequest(NSURLRequest *request, NSUInteger dataLength, NSString *stringForIfRange)
{
    NSString *range = [request.allHTTPHeaderFields tnl_objectForCaseInsensitiveKey:@"Range"];
    NSString *ifRange = [request.allHTTPHeaderFields tnl_objectForCaseInsensitiveKey:@"If-Range"];
    if ((!ifRange || !stringForIfRange || [ifRange isEqualToString:stringForIfRange]) && [range hasPrefix:@"bytes="]) {
        range = [range substringFromIndex:[@"bytes=" length]];
        NSArray<NSString *> *ranges = [range componentsSeparatedByString:@","];
        if (ranges.count == 1) {
            range = ranges.firstObject;
            NSArray<NSString *> *indexes = [range componentsSeparatedByString:@"-"];
            if (indexes.count == 2) {
                const NSInteger startIndex = [indexes[0] integerValue];
                NSInteger endIndex = (NSInteger)dataLength - 1;
                if ([indexes[1] length] > 0) {
                    endIndex = [indexes[1] integerValue];
                }
                if (endIndex >= startIndex) {
                    return NSMakeRange((NSUInteger)startIndex, (NSUInteger)endIndex - (NSUInteger)startIndex);
                }
            }
        }
    }

    return NSMakeRange(NSNotFound, 0);
}