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magic.ts

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import { BinFmt } from "./bytecode"

export const IMAGE_MIN_LENGTH = 100

function read32(buf: Uint8Array, pos: number) {

return (

(buf[pos] |

(buf[pos + 1] << 8) |

(buf[pos + 2] << 16) |

(buf[pos + 3] << 24)) >>>

0

)

}

export function checkMagic(img: Uint8Array) {

return read32(img, 0) === BinFmt.MAGIC0 && read32(img, 4) === BinFmt.MAGIC1

}