THRIFT-821. Add a method to get a copy of the TMemoryBuffer's buffer.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@966385 13f79535-47bb-0310-9956-ffa450edef68

lib/cocoa/src/transport/TMemoryBuffer.h

@@ -25,4 +25,5 @@
 	NSUInteger mOffset;
 }
 - (id)initWithData:(NSData *)data;
+- (NSData *)getBuffer;
 @end

lib/cocoa/src/transport/TMemoryBuffer.m

@@ -23,6 +23,14 @@
 #define GARBAGE_BUFFER_SIZE 4096 // 4KiB
 
 @implementation TMemoryBuffer
+- (id)init {
+	if (self = [super init]) {
+		mBuffer = [[NSMutableData alloc] init];
+		mOffset = 0;
+	}
+	return self;
+}
+
 - (id)initWithData:(NSData *)data {
 	if (self = [super init]) {
 		mBuffer = [data mutableCopy];
@@ -52,6 +60,10 @@
 	// noop
 }
 
+- (NSData *)getBuffer {
+	return [[mBuffer copy] autorelease];
+}
+
 - (void)dealloc {
 	[mBuffer release];
 	[super dealloc];