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Re: Getting the content-type in a HTTP response


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.

It can look like this:

static Boolean caseInsensitiveCompare (const void *a, const void *b);
static CFHashCode caseInsensitiveHash (const void *value);

@implementation NSHTTPURLResponse (XYZAdditions)

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

	CFDictionaryKeyCallBacks keyCallbacks;

	keyCallbacks.retain = CFRetain;
	keyCallbacks.release = CFRelease;
	keyCallbacks.copyDescription = CFCopyDescription;
	keyCallbacks.equal = caseInsensitiveCompare;
	keyCallbacks.hash = caseInsensitiveHash;

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

	// Now copy keys and values from src to dest

	return (NSDictionary *)dest;
}

@end

static Boolean caseInsensitiveCompare (const void *a, const void *b);
{
// Assuming that keys are strings
return [(NSString *)a caseInsensitiveCompare:(NSString *)b] == NSOrderedSame;
}

static CFHashCode caseInsensitiveHash (const void *value);
{
	// Assuming that keys are strings
	return [[value lower] hash];
}


Compiles in Mail.app :-)


Example usage:

- (void)connection:(NSURLConnection*)connection didReceiveResponse: (NSURLResponse*)theResponse
{
NSString* content_type = [[(NSHTTPURLResponse*)theResponse xyzHTTPHeaders] objectForKey:@"coNtent-tyPe"];
}



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>)



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