加入putObjectPart方法支持从内存变量上传文件分片 #57
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在调用initiateMultipartUpload取得$uploadId之后,此方法可以无需打开和seek定位文件,直接以内存中的变量作为分片上传,全部分片上传后调用completeMultipartUpload即可完成上传。
适用于分片数据来自非本地文件的情况,如打开的http网络资源,或者自定义的数据读取方法,由特定算法生成的数据输出等等。