Parse text encoding from Content-Type header when supplied

Thanks to Shaun Harrison for this suggestion!

@@ -166,6 +166,9 @@ typedef enum _ASINetworkErrorType {
 	BOOL haveBuiltPostBody;
 	
 	unsigned long long uploadBufferSize;
+	
+	NSStringEncoding defaultResponseEncoding;
+	NSStringEncoding responseEncoding;
 }
 
 #pragma mark init / dealloc
@@ -305,4 +308,6 @@ typedef enum _ASINetworkErrorType {
 @property (assign) BOOL showAccurateProgress;
 @property (assign,readonly) unsigned long long totalBytesRead;
 @property (assign) unsigned long long uploadBufferSize;
+@property (assign) NSStringEncoding defaultResponseEncoding;
+@property (assign) NSStringEncoding responseEncoding;
 @end

@@ -72,6 +72,7 @@ static NSError *ASIUnableToCreateRequestError;
 	requestAuthentication = NULL;
 	haveBuiltPostBody = NO;
 	request = NULL;
+	[self setDefaultResponseEncoding:NSISOLatin1StringEncoding];
 	[self setUploadBufferSize:0];
 	[self setResponseHeaders:nil];
 	[self setTimeOutSeconds:10];
@@ -171,7 +172,8 @@ static NSError *ASIUnableToCreateRequestError;
 	if (!receivedData) {
 		return nil;
 	}
-	return [[[NSString alloc] initWithBytes:[receivedData bytes] length:[receivedData length] encoding:NSUTF8StringEncoding] autorelease];
+	
+	return [[[NSString alloc] initWithBytes:[receivedData bytes] length:[receivedData length] encoding:[self responseEncoding]] autorelease];
 }
 
 
@@ -738,6 +740,22 @@ static NSError *ASIUnableToCreateRequestError;
 				}
 			}
 			
+			// Handle response text encoding
+			// If the Content-Type header specified an encoding, we'll use that, otherwise we use defaultStringEncoding (which defaults to NSISOLatin1StringEncoding)
+			NSString *contentType = [[self responseHeaders] objectForKey:@"Content-Type"];
+			NSStringEncoding encoding = [self defaultResponseEncoding];
+			if (contentType) {
+				NSArray *parts = [contentType componentsSeparatedByString:@"="];
+				NSString *IANAEncoding = [parts objectAtIndex:[parts count]-1];
+				if (IANAEncoding) {
+					CFStringEncoding cfEncoding = CFStringConvertIANACharSetNameToEncoding((CFStringRef)IANAEncoding);
+					if (cfEncoding != kCFStringEncodingInvalidId) {
+						encoding = CFStringConvertEncodingToNSStringEncoding(cfEncoding);
+					}
+				}
+			}
+			[self setResponseEncoding:encoding];
+			
 			// Handle cookies
 			NSArray *cookies = [NSHTTPCookie cookiesWithResponseHeaderFields:responseHeaders forURL:url];
 			[self setResponseCookies:cookies];
@@ -1182,4 +1200,6 @@ static NSError *ASIUnableToCreateRequestError;
 @synthesize showAccurateProgress;
 @synthesize totalBytesRead;
 @synthesize uploadBufferSize;
+@synthesize defaultResponseEncoding;
+@synthesize responseEncoding;
 @end

@@ -24,5 +24,6 @@
 - (void)testCookies;
 - (void)testBasicAuthentication;
 - (void)testDigestAuthentication;
+- (void)testCharacterEncoding;
 
 @end

@@ -53,9 +53,31 @@
 	STAssertTrue(success,@"Failed to generate an error for a bad host");
 }
 
+- (void)testCharacterEncoding
+{
+	
+	NSArray *IANAEncodings = [NSArray arrayWithObjects:@"UTF-8",@"US-ASCII",@"ISO-8859-1",@"UTF-16",nil];
+	NSUInteger NSStringEncodings[] = {NSUTF8StringEncoding,NSASCIIStringEncoding,NSISOLatin1StringEncoding,NSUnicodeStringEncoding};
+	
+	int i;
+	for (i=0; i<[IANAEncodings count]; i++) {
+		NSURL *url = [[[NSURL alloc] initWithString:[NSString stringWithFormat:@"http://allseeing-i.com/ASIHTTPRequest/tests/Character-Encoding/%@",[IANAEncodings objectAtIndex:i]]] autorelease];
+		ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:url] autorelease];
+		[request start];
+		BOOL success = [request responseEncoding] == NSStringEncodings[i];
+		STAssertTrue(success,[NSString stringWithFormat:@"Failed to use the correct text encoding for %@i",[IANAEncodings objectAtIndex:i]]);
+	}
+					 
+	NSURL *url = [[[NSURL alloc] initWithString:@"http://allseeing-i.com/ASIHTTPRequest/tests/Character-Encoding/Something-else"] autorelease];
+	ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:url] autorelease];
+	[request setDefaultResponseEncoding:NSWindowsCP1251StringEncoding];
+	[request start];
+	BOOL success = [request responseEncoding] == [request defaultResponseEncoding];
+	STAssertTrue(success,[NSString stringWithFormat:@"Failed to use the default string encoding"]);
+}
+
 - (void)testTimeOut
 {
-	//Grab data
 	NSURL *url = [[[NSURL alloc] initWithString:@"http://allseeing-i.com"] autorelease];
 	ASIHTTPRequest *request = [[[ASIHTTPRequest alloc] initWithURL:url] autorelease];
 	[request setTimeOutSeconds:0.0001]; //It's pretty unlikely we will be able to grab the data this quickly, so the request should timeout