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Re: Getting the content-type in a HTTP response


On Jan 27, 2008, at 00:44, Nir Soffer wrote:


On Jan 26, 2008, at 01:57, Dave Carrigan wrote:

So my next question is if it's possible to override NSDictionary's comparison operator to be case insensitive (a la STL's maps) or if I should just create a new dictionary that copies the old dictionary with downcased keys. The former would be more bulletproof since it wouldn't require other programmers to remember to downcase all their dictionary lookups.

NSDictionary uses -isEqual: - you probably can't change it. You can create a CFMutableDictionaryRef with CFDictionaryKeyCallBacks that will do case insensitive compare, then copy the original keys and values to this dictionary and use it for accessing the values. 


Here is a working example:

////////  NSHTTPURLResponse_XYZAdditions.h

#import <Foundation/Foundation.h>

@interface NSHTTPURLResponse (XYZAdditions)
- (NSDictionary *)xyzHTTPHeaders;
@end

////////  NSHTTPURLResponse_XYZAdditions.m

#import "NSHTTPURLResponse_XYZAdditions.h"


static Boolean caseInsensitiveEqual (const void *a, const void *b)
{
    return [(id)a compare:(id)b options:
        NSCaseInsensitiveSearch | NSLiteralSearch] == NSOrderedSame;
}

static CFHashCode caseInsensitiveHash (const void *value)
{
    return [[(id)value lowercaseString] hash];
}

@implementation NSHTTPURLResponse (XYZAdditions)

- (NSDictionary *)xyzHTTPHeaders;
{
	NSDictionary *src = [self allHeaderFields];

	CFDictionaryKeyCallBacks keyCallbacks = kCFTypeDictionaryKeyCallBacks;
	keyCallbacks.equal = caseInsensitiveEqual;
	keyCallbacks.hash = caseInsensitiveHash;

	CFMutableDictionaryRef dest = CFDictionaryCreateMutable (
		kCFAllocatorDefault,
   		[src count], // capacity
   		&keyCallbacks,
   		&kCFTypeDictionaryValueCallBacks
	);

	NSEnumerator *enumerator = [src keyEnumerator];
        id key = nil;
        while (key = [enumerator nextObject]) {
        id value = [src objectForKey:key];
        [(NSMutableDictionary *)dest setObject:value forKey:key];
    }

	return (NSDictionary *)dest;
}

@end


Example usage:

- (void)connection:(NSURLConnection *)con didReceiveResponse: (NSURLResponse *)response
{
NSDictionary *headers = [(NSHTTPURLResponse*)response xyzHTTPHeaders];
NSLog(@"content-type: %@", [headers objectForKey:@"coNtent-tyPe"]);
}


See also this thread: http://www.cocoabuilder.com/archive/message/ cocoa/2002/10/10/70653


Best Regards,

Nir Soffer

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References: 
 >Getting the content-type in a HTTP response (From: Dave Carrigan <email@hidden>)
 >Re: Getting the content-type in a HTTP response (From: Bill Garrison <email@hidden>)
 >Re: Getting the content-type in a HTTP response (From: Dave Carrigan <email@hidden>)
 >Re: Getting the content-type in a HTTP response (From: Nir Soffer <email@hidden>)



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