Method calcSha256Hash

testutil/image_hash.go:258–279

calcSha256Hash calculates the SHA-256 hash for the given image data buffer

(buf []byte)

// calcSha256Hash calculates the SHA-256 hash for the given image data buffer
func (h *ImageHash) calcSha256Hash(buf []byte) error {
	var rgbaData unsafe.Pointer
	var rgbaSize C.size_t

	defer func() {
		if rgbaData != nil {
			C.free(rgbaData)
		}
	}()

	// Load RGBA pixels using VIPS
	bufPtr := unsafe.Pointer(unsafe.SliceData(buf))
	readErr := C.vips_rgba_image_data(bufPtr, C.size_t(len(buf)), &rgbaData, &rgbaSize)
	if readErr != 0 {
		return fmt.Errorf("failed to convert image to RGBA for hashing: %s", vipsErrorMessage())
	}

	// Calculate SHA-256 hash
	h.sha256Hash = sha256.Sum256(unsafe.Slice((*byte)(rgbaData), int(rgbaSize)))

	return nil
}