Determine internal format of given astc compressed image through its header!!

Hi Sean Ellis

I am writing a webgl based html application that uses astc compressed textures to be loaded on my triangle. I would like to know that does there exists a way to know whether the internal format of the compressed astc image(that in my case might be located on a remote web server) is linear or srgb encoded, by parsing the astc header. I can then use that internalFormat information obtained to pass my astc texture to glCompressedTexImage2D(). In other words, for eg. I want to know whether my internal format is "COMPRESSED_RGBA_ASTC_4x4_KHR" or "COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR" from the header of any astc compressed image. Any clues?

Thank you

Regards,

Deepak