fixed zero-length appendData bug and added appendPartWithStreamingURL method

AFNetworking/AFHTTPClient.h

@@ -498,6 +498,19 @@ extern NSString * AFQueryStringFromParametersWithEncoding(NSDictionary *paramete
  */
 - (BOOL)appendPartWithFileURL:(NSURL *)fileURL name:(NSString *)name error:(NSError **)error;
 
+/**
+ Appends the HTTP header `Content-Disposition: file; filename=#{generated filename}; name=#{name}"` and `Content-Type: #{mimeType}`, followed by the encoded file data and the multipart form boundary, using NSInputStream to read input.
+ 
+ @param fileURL The URL corresponding to the file whose content will be appended to the form.
+ @param name The name to be associated with the specified data. This parameter must not be `nil`.
+ @param mimeType The MIME type of the specified data. (For example, the MIME type for a JPEG image is image/jpeg.) For a list of valid MIME types, see http://www.iana.org/assignments/media-types/. This parameter must not be `nil`.
+  
+ @discussion The filename is generated from the last component of the streamingURL parameter. The size of the buffer used to copy from streamingURL to the output stream is defined by the constant kAFStreamToStreamBufferSize.
+ */
+- (void)appendPartWithStreamingURL:(NSURL *)streamingURL
+                              name:(NSString *)name 
+                          mimeType:(NSString *)mimeType;
+
 /**
  Appends encoded data to the form data.
  

AFNetworking/AFHTTPClient.m

@@ -680,6 +680,8 @@ static NSString * const kAFMultipartFormBoundary = @"Boundary+0xAbCdEfGbOuNdArY"
 
 static NSString * const kAFMultipartFormCRLF = @"\r\n";
 
+static NSInteger const kAFStreamToStreamBufferSize = 1024*1024; //1 meg default
+
 static inline NSString * AFMultipartFormInitialBoundary() {
     return [NSString stringWithFormat:@"--%@%@", kAFMultipartFormBoundary, kAFMultipartFormCRLF];
 }
@@ -751,10 +753,10 @@ static inline NSString * AFMultipartFormFinalBoundary() {
     
     [self.request setValue:[NSString stringWithFormat:@"multipart/form-data; boundary=%@", kAFMultipartFormBoundary] forHTTPHeaderField:@"Content-Type"];
     [self.request setValue:[[self.outputStream propertyForKey:NSStreamFileCurrentOffsetKey] stringValue] forHTTPHeaderField:@"Content-Length"];
-    [self.request setHTTPBodyStream:[NSInputStream inputStreamWithFileAtPath:self.temporaryFilePath]];
     
     [self.outputStream close];
-    
+    [self.request setHTTPBodyStream:[NSInputStream inputStreamWithFileAtPath:self.temporaryFilePath]];
+
     return self.request;
 }
 
@@ -790,16 +792,45 @@ static inline NSString * AFMultipartFormFinalBoundary() {
     [self appendPartWithHeaders:mutableHeaders body:data];
 }
 
+- (NSMutableDictionary *)fileHeadersWithName:(NSString *)name 
+                                    fileName:(NSString *)fileName 
+                                    mimeType:(NSString *)mimeType {
+  NSMutableDictionary *mutableHeaders = [NSMutableDictionary dictionary];
+  [mutableHeaders setValue:[NSString stringWithFormat:@"form-data; name=\"%@\"; filename=\"%@\"", name, fileName] forKey:@"Content-Disposition"];
+  [mutableHeaders setValue:mimeType forKey:@"Content-Type"];
+  return mutableHeaders;
+}
+
 - (void)appendPartWithFileData:(NSData *)data 
                           name:(NSString *)name 
                       fileName:(NSString *)fileName 
                       mimeType:(NSString *)mimeType
 {    
-    NSMutableDictionary *mutableHeaders = [NSMutableDictionary dictionary];
-    [mutableHeaders setValue:[NSString stringWithFormat:@"form-data; name=\"%@\"; filename=\"%@\"", name, fileName] forKey:@"Content-Disposition"];
-    [mutableHeaders setValue:mimeType forKey:@"Content-Type"];
     
-    [self appendPartWithHeaders:mutableHeaders body:data];
+  [self appendPartWithHeaders:[self fileHeadersWithName:name fileName:fileName mimeType:mimeType] body:data];
+}
+
+- (void)appendPartWithStreamingURL:(NSURL *)streamingURL
+                              name:(NSString *)name 
+                          mimeType:(NSString *)mimeType
+{
+  
+  NSString * fileName = [[streamingURL pathComponents] objectAtIndex:([[streamingURL pathComponents] count] - 1)];
+  [self appendPartWithHeaders:[self fileHeadersWithName:name fileName:fileName mimeType:mimeType] body:nil];
+
+  NSInputStream * inputStream = [NSInputStream inputStreamWithURL:streamingURL];
+  [inputStream scheduleInRunLoop:[NSRunLoop currentRunLoop] 
+                         forMode:NSRunLoopCommonModes];
+  [inputStream open];
+
+  void * dataBuffer = malloc(kAFStreamToStreamBufferSize);
+  NSInteger bytesRead = [inputStream read:dataBuffer maxLength:kAFStreamToStreamBufferSize];
+  while (bytesRead > 0) {
+    NSData * tempData = [NSData dataWithBytesNoCopy:dataBuffer length:bytesRead freeWhenDone:NO];
+    [self appendData:tempData];
+    bytesRead = [inputStream read:dataBuffer maxLength:kAFStreamToStreamBufferSize];
+  }  
+  free(dataBuffer);
 }
 
 - (BOOL)appendPartWithFileURL:(NSURL *)fileURL 
@@ -837,9 +868,14 @@ static inline NSString * AFMultipartFormFinalBoundary() {
 }
 
 - (void)appendData:(NSData *)data {
+    if ([data length] == 0) {
+      return;
+    }
     if ([self.outputStream hasSpaceAvailable]) {
         const uint8_t *dataBuffer = (uint8_t *) [data bytes];
         [self.outputStream write:&dataBuffer[0] maxLength:[data length]];
+    } else {
+      NSLog(@"Failed to append to outputStream!");
     }
 }