1 files changed, 98 insertions, 0 deletions
diff --git a/Foundation/GTMFourCharCode.m b/Foundation/GTMFourCharCode.m
new file mode 100644
index 0000000..6b67cae
--- /dev/null
+++ b/Foundation/GTMFourCharCode.m
@@ -0,0 +1,98 @@
+//
+//  GTMFourCharCode.m
+//  Wrapper for FourCharCodes
+//
+//  Copyright 2008 Google Inc.
+//
+//  Licensed under the Apache License, Version 2.0 (the "License"); you may not
+//  use this file except in compliance with the License.  You may obtain a copy
+//  of the License at
+// 
+//  http://www.apache.org/licenses/LICENSE-2.0
+// 
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+//  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+//  License for the specific language governing permissions and limitations under
+//  the License.
+//
+
+#import "GTMDefines.h"
+#import "GTMFourCharCode.h"
+#import "GTMGarbageCollection.h"
+#import <CoreServices/CoreServices.h>
+
+@implementation GTMFourCharCode
+
++ (id)stringWithFourCharCode:(FourCharCode)code {
+  return [GTMNSMakeCollectable(UTCreateStringForOSType(code)) autorelease];
+}
+
++ (id)fourCharCodeWithString:(NSString*)string {
+  return [[[self alloc] initWithString:string] autorelease];
+}
+
++ (id)fourCharCodeWithFourCharCode:(FourCharCode)code {
+  return [[[self alloc] initWithFourCharCode:code] autorelease];
+}
+
+- (id)initWithString:(NSString*)string {
+  NSUInteger length = [string length];
+  if (length == 0 || length > 4) {
+    [self release];
+    return nil;
+  } else {
+    return [self initWithFourCharCode:UTGetOSTypeFromString((CFStringRef)string)];
+  }
+}
+
+- (id)initWithFourCharCode:(FourCharCode)code {
+  if ((self = [super init])) {
+    code_ = code;
+  }
+  return self;
+}
+
+- (id)initWithCoder:(NSCoder *)aDecoder {
+  if ((self = [super init])) {
+    code_ = [aDecoder decodeInt32ForKey:@"FourCharCode"];
+  }
+  return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)aCoder {
+  [aCoder encodeInt32:code_ forKey:@"FourCharCode"];
+}
+
+- (id)copyWithZone:(NSZone *)zone {
+  return [[[self class] alloc] initWithFourCharCode:code_];
+}
+
+- (BOOL)isEqual:(id)object {
+  return [object isKindOfClass:[self class]] && [object fourCharCode] == code_;
+}
+
+- (NSUInteger)hash {
+  return (NSUInteger)code_;
+}
+
+- (NSString *)description {
+  return [NSString stringWithFormat:@"%@ - %@ (0x%X)", 
+          [self class],
+          [self stringValue],
+          code_];
+}
+
+- (FourCharCode)fourCharCode {
+  return code_;
+}
+
+- (NSString*)stringValue {
+  return [GTMNSMakeCollectable(UTCreateStringForOSType(code_)) autorelease];
+}
+
+- (NSNumber*)numberValue {
+  return [NSNumber numberWithUnsignedInt:code_];
+}
+
+@end