gistfile1.m

-(NSMutableData*) createHTTPPostBodyWithParameters:(NSDictionary*)params boundary:(NSString*)boundary
{
  NSAutoreleasePool *pool = [NSAutoreleasePool new];

  NSMutableArray *paramsArray = [NSMutableArray  array];
  NSMutableData  *paramsData  = [NSMutableData     new];
  NSString       *enter       = @"\r\n";

  for(id key in params) {
    [paramsArray addObject:[NSString stringWithFormat:@"--%@%@", boundary, enter]];
    [paramsArray addObject:[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"", key]];

    // File
    if(key == @"file") {
      id filePath = [params valueForKey:key];
      id fileName = [filePath lastPathComponent];
      id fileData = [NSData dataWithContentsOfFile:filePath];

      [paramsArray addObject:[NSString stringWithFormat:@"; filename=\"%@\"%@", fileName, enter]];
      [paramsArray addObject:[NSString stringWithFormat:@"Content-Type: application/octet-stream%@%@", enter, enter]];
      [paramsArray addObject:fileData];
    // not File
    } else {
      [paramsArray addObject:[NSString stringWithFormat:@"%@%@", enter, enter]];
      [paramsArray addObject:[params valueForKey:key]];
    }   
    [paramsArray addObject:[NSString stringWithFormat:@"%@", enter]];
  }

  // source
  [paramsArray addObject:[NSString stringWithFormat:@"--%@%@", boundary, enter]];
  [paramsArray addObject:@"Content-Disposition: form-data; name=\"source\""];
  [paramsArray addObject:[NSString stringWithFormat:@"%@%@", enter, enter]];
  [paramsArray addObject:[NSString stringWithFormat:@"%@%@", [USER_AGENT valueForKey:@"name"], enter]];

  // term
  [paramsArray addObject:[NSString stringWithFormat:@"--%@--", boundary]];

  for(id obj in paramsArray) {
    if([obj isKindOfClass:[NSString class]]) {
      [paramsData appendData:[obj dataUsingEncoding:NSUTF8StringEncoding]];
    } else {
      if(![obj isKindOfClass:[NSData class]]) continue;
      [paramsData appendData:obj];
    }   
  }

  [pool release];

  return [paramsData autorelease];
}