Initial import.

RSXML/RSXMLInternal.m

@@ -0,0 +1,83 @@
+//
+//  RSXMLInternal.m
+//  RSXML
+//
+//  Created by Brent Simmons on 12/26/16.
+//  Copyright © 2016 Ranchero Software, LLC. All rights reserved.
+//
+
+#import <CommonCrypto/CommonDigest.h>
+#import "RSXMLInternal.h"
+
+
+static BOOL RSXMLIsNil(id obj) {
+	
+	return obj == nil || obj == [NSNull null];
+}
+
+BOOL RSXMLIsEmpty(id obj) {
+	
+	if (RSXMLIsNil(obj)) {
+		return YES;
+	}
+	
+	if ([obj respondsToSelector:@selector(count)]) {
+		return [obj count] < 1;
+	}
+	
+	if ([obj respondsToSelector:@selector(length)]) {
+		return [obj length] < 1;
+	}
+	
+	return NO; /*Shouldn't get here very often.*/
+}
+
+BOOL RSXMLStringIsEmpty(NSString *s) {
+	
+	return RSXMLIsNil(s) || s.length < 1;
+}
+
+
+@implementation NSString (RSXMLInternal)
+
+- (NSData *)rsxml_md5Hash {
+	
+	NSData *data = [self dataUsingEncoding:NSUTF8StringEncoding];
+	unsigned char hash[CC_MD5_DIGEST_LENGTH];
+	CC_MD5(data.bytes, (CC_LONG)data.length, hash);
+	
+	return [NSData dataWithBytes:(const void *)hash length:CC_MD5_DIGEST_LENGTH];
+}
+
+- (NSString *)rsxml_md5HashString {
+	
+	NSData *md5Data = [self rsxml_md5Hash];
+	const Byte *bytes = md5Data.bytes;
+	return [NSString stringWithFormat:@"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7], bytes[8], bytes[9], bytes[10], bytes[11], bytes[12], bytes[13], bytes[14], bytes[15]];
+}
+
+@end
+
+
+@implementation NSDictionary (RSXMLInternal)
+
+
+- (nullable id)rsxml_objectForCaseInsensitiveKey:(NSString *)key {
+	
+	id obj = self[key];
+	if (obj) {
+		return obj;
+	}
+	
+	for (NSString *oneKey in self.allKeys) {
+		
+		if ([oneKey isKindOfClass:[NSString class]] && [key caseInsensitiveCompare:oneKey] == NSOrderedSame) {
+			return self[oneKey];
+		}
+	}
+	
+	return nil;
+}
+
+
+@end