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What is the math for adjusting exposure in Photoshop?

I spent a lot of time on google, but could not find anything useful. I want to set the exposure value of the image, as Photoshop does. So I want to know how to change the bitmap, how to adjust the exposure of Photoshop?

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Theoretically, to modify exposure x (x is a signed floating point value, 0.0 for non-compensation), you should multiply each pixel brightness value (or each sub-pixel in RVB) by 2 ^ x.

newValue = oldValue * (2 ^ exposureCompensation);

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