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static Boolean PSPDFCaseInsensitiveEqualCallback(const void *a, const void *b) { | |
id objA = (__bridge id)a, objB = (__bridge id)b; | |
Boolean ret = FALSE; | |
if ([objA isKindOfClass:NSString.class] && [objB isKindOfClass:NSString.class]) { | |
ret = ([objA compare:objB options:NSCaseInsensitiveSearch|NSLiteralSearch] == NSOrderedSame); | |
}else { | |
ret = [objA isEqual:objB]; | |
} | |
return ret; | |
} | |
static CFHashCode PSPDFCaseInsensitiveHashCallback(const void *value) { | |
id idValue = (__bridge id)value; | |
CFHashCode ret = 0; | |
if ([idValue isKindOfClass:NSString.class]) { | |
ret = [[idValue lowercaseString] hash]; | |
}else { | |
ret = [(NSObject *)idValue hash]; | |
} | |
return ret; | |
} | |
- (NSDictionary *)pspdf_caseInsensitiveDictionary { | |
CFDictionaryKeyCallBacks keyCallbacks = kCFCopyStringDictionaryKeyCallBacks; | |
keyCallbacks.equal = PSPDFCaseInsensitiveEqualCallback; | |
keyCallbacks.hash = PSPDFCaseInsensitiveHashCallback; | |
void *keys = NULL, *values = NULL; | |
CFIndex count = CFDictionaryGetCount((CFDictionaryRef)self); | |
if (count) { | |
keys = malloc(count * sizeof(void *)); | |
values = malloc(count * sizeof(void *)); | |
if (!keys || !values) { | |
free(keys), free(values); | |
return self; | |
} | |
CFDictionaryGetKeysAndValues((CFDictionaryRef)self, keys, values); | |
} | |
CFDictionaryRef caseInsensitiveDict = CFDictionaryCreate(kCFAllocatorDefault, keys, values, count, &keyCallbacks, &kCFTypeDictionaryValueCallBacks); | |
free(keys); | |
free(values); | |
return CFBridgingRelease(caseInsensitiveDict); | |
} |
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实现了一个key大小写不敏感的dictionary