Fix usage of deprecated method stringByAddingPercentEscapesUsingEncoding:.

src/common/mac/HTTPMultipartUpload.m

 // Copyright (c) 2006, Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 12 matching lines @@
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #import "HTTPMultipartUpload.h"
 #import "GTMDefines.h"
 
+// As -[NSString stringByAddingPercentEscapesUsingEncoding:] has been
+// deprecated with iOS 9.0 / OS X 10.11 SDKs, this function re-implements it
+// using -[NSString stringByAddingPercentEncodingWithAllowedCharacters:] when
+// using those SDKs.
+static NSString *PercentEncodeNSString(NSString *key) {
+#if (defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && defined(__IPHONE_9_0) &&     \
+     __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_9_0) ||                      \
+    (defined(MAC_OS_X_VERSION_MIN_REQUIRED) &&                                 \
+     defined(MAC_OS_X_VERSION_10_11) &&                                        \
+     MAC_OS_X_VERSION_MIN_REQUIRED >= MAC_OS_X_VERSION_10_11)
+  return [key stringByAddingPercentEncodingWithAllowedCharacters:
+                  [NSCharacterSet URLQueryAllowedCharacterSet]];
+#else
+  return [key stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+#endif
+}
+
 @interface HTTPMultipartUpload(PrivateMethods)
 - (NSString *)multipartBoundary;
 // Each of the following methods will append the starting multipart boundary,
 // but not the ending one.
 - (NSData *)formDataForKey:(NSString *)key value:(NSString *)value;
 - (NSData *)formDataForFileContents:(NSData *)contents name:(NSString *)name;
 - (NSData *)formDataForFile:(NSString *)file name:(NSString *)name;
 @end
 
 @implementation HTTPMultipartUpload
 //=============================================================================
 #pragma mark -
 #pragma mark || Private ||
 //=============================================================================
 - (NSString *)multipartBoundary {
   // The boundary has 27 '-' characters followed by 16 hex digits
   return [NSString stringWithFormat:@"---------------------------%08X%08X",
     rand(), rand()];
 }
 
 //=============================================================================
 - (NSData *)formDataForKey:(NSString *)key value:(NSString *)value {
-  NSString *escaped =
-    [key stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+  NSString *escaped = PercentEncodeNSString(key);
   NSString *fmt =
     @"--%@\r\nContent-Disposition: form-data; name=\"%@\"\r\n\r\n%@\r\n";
   NSString *form = [NSString stringWithFormat:fmt, boundary_, escaped, value];
 
   return [form dataUsingEncoding:NSUTF8StringEncoding];
 }
 
 //=============================================================================
 - (NSData *)formDataForFileContents:(NSData *)contents name:(NSString *)name {
   NSMutableData *data = [NSMutableData data];
-  NSString *escaped =
-    [name stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
+  NSString *escaped = PercentEncodeNSString(name);
   NSString *fmt = @"--%@\r\nContent-Disposition: form-data; name=\"%@\"; "
     "filename=\"minidump.dmp\"\r\nContent-Type: application/octet-stream\r\n\r\n";
   NSString *pre = [NSString stringWithFormat:fmt, boundary_, escaped];
 
   [data appendData:[pre dataUsingEncoding:NSUTF8StringEncoding]];
   [data appendData:contents];
 
   return data;
 }
 
@@ skipping 126 matching lines @@
 
   return data;
 }
 
 //=============================================================================
 - (NSHTTPURLResponse *)response {
   return response_;
 }
 
 @end