上傳大文件 NSInputStream

/**
 *  @method + (NSString *)uploadVideoFilePath:(NSString *)filePath withFileName:(NSString *)fileName withFileExt:(NSString *)fileExt withErrorCode:(NSInteger *)errorCode
 *
 *  @abstract 上傳文件
 *
 *  @param fileData   文件數據
 *  @param errorCode  [out]錯誤代碼
 *
 *  @return 如果上傳成功則返回資源路徑
 */
+ (NSString *)uploadVideoFilePath:(NSString *)filePath
                     withFileName:(NSString *)fileName
                      withFileExt:(NSString *)fileExt
                    withErrorCode:(NSInteger *)errorCode
{
    NSMutableString * uploadFileURL = [[NSMutableString alloc] initWithCapacity:20];
    [uploadFileURL appendFormat:@"http://%@/upload_file",UPLOAD_HOST];
    [uploadFileURL appendFormat:@"?%@",[self getURLSuffixWithURL]];

    //創建Request對象
    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
    [request setURL:[NSURL URLWithString:uploadFileURL]];
    [request setHTTPMethod:@"POST"];
    NSMutableData *body = [NSMutableData data];

    //設置表單項分隔符
    NSString *boundary = @"---------------------------20140601chrrsmusic1703";

    //設置內容類型
    NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",boundary];
    [request addValue:contentType forHTTPHeaderField: @"Content-Type"];

    //寫入圖片的內容
    NSString * fileFullName = [NSString stringWithFormat:@"%@.%@",fileName,fileExt];
    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"%@\"\r\n",fileName,fileFullName] dataUsingEncoding:NSUTF8StringEncoding]];
    NSString * contentTypeStr = [NSString stringWithFormat:@"Content-Type: video/%@\r\n\r\n",fileExt];
    [body appendData:[contentTypeStr dataUsingEncoding:NSUTF8StringEncoding]];
    //    NSString * appendDataStr = [[NSString alloc] initWithData:body encoding:NSUTF8StringEncoding]];
    //    DELOG(@"appendDataStr: \r\n%@",appendDataStr);

    // 視頻數據
    NSInputStream * fileStream = [[NSInputStream alloc] initWithFileAtPath:filePath];
    [fileStream open];
    NSInteger maxLength = 128;
    uint8_t readBuffer [maxLength];
    BOOL endOfStreamReached = NO;
    while (! endOfStreamReached)
    {
        NSInteger bytesRead = [fileStream read:readBuffer maxLength:maxLength];
        if (bytesRead == 0)
        {//文件讀取到最後
            endOfStreamReached = YES;
        }else if (bytesRead == -1)
        {//文件讀取錯誤
            endOfStreamReached = YES;
        }else
        {
            [body appendBytes:readBuffer length:bytesRead];
        }
    }
    [fileStream close];

    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

    //寫入尾部內容
    [body appendData:[[NSString stringWithFormat:@"--%@--\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];

    [request setHTTPBody:body];

    NSHTTPURLResponse *urlResponese = nil;
    NSError *error = [[NSError alloc]init];
    NSData* resultData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponese error:&error];
    if (!resultData) {
        *errorCode = -1;
        return nil;
    }
    NSDictionary *jsonData = [NSJSONSerialization JSONObjectWithData:resultData options:NSJSONReadingMutableLeaves error:nil];
    NSInteger statusCode = [[NSString ensureStringFor:[jsonData objectForKey:@"state"]] integerValue];
    *errorCode = statusCode;
    if (statusCode == 402) {
        // 發出需要登錄的通知
        dispatch_async(dispatch_get_main_queue(), ^{
            [[NSNotificationCenter defaultCenter] postNotificationName:NOTIFICATION_NEED_LOGINTOKEN
                                                                object:nil];
        });
    }

    if (statusCode != 0) {
        *errorCode = statusCode;
        return nil;
    }else{
        NSDictionary * data = [jsonData objectForKey:@"data"];
        if (![data isKindOfClass:[NSDictionary class]]) {
            return nil;
        }else{
            NSString * fileURL = [NSString ensureStringFor:[data objectForKey:@"uri"]];
            return fileURL;
        }
    }
}