a simpler way for verifying an whether a file is an image or not
a simpler way for verifying an whether a file is an image or not

topicdesign/topkit-server,topicdesign/topkit-server,topicdesign/topkit-server,topicdesign/topkit-builder,topicdesign/topkit-builder,topicdesign/topkit-builder,topicdesign/topkit-builder,topicdesign/topkit-server