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Proof step 31 from proof inv-write-data-wl (previous step)

n0 + # buf1 = align↑(datasize(buf, n0 + # buf1), EB_PAGE_SIZE), LEB_SIZE = n1 + # buf1, LEB_SIZE = n3 + # buf1, apebs[n2] = mkpeb(aehdr, avhdr, buf0, 0, false), avhdr.valid?, aehdr.valid?, n2 < # apebs, is-aligned(# buf1, EB_PAGE_SIZE), ubi-io-inv(apebs), ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf0, 0, false)), # buf1 ≤ # buf, # buf1 ≤ LEB_SIZE, n0 + # buf1 ≤ # buf, n0 + # buf1 ≤ LEB_SIZE, ⌊err0⌋ , datasize(buf1, # buf1) < datasize(buf, n0 + # buf1) ∨ checksum(buf1 + mkempbuf(n0), datasize(buf, n0 + # buf1)) ≠ checksum(buf, datasize(buf, n0 + # buf1)) ⊦ datasize(buf, n0 + # buf1) = 0, (aehdr = empty → avhdr = empty) ∧ (aehdr ≠ garbage ∧ avhdr = empty → # buf1 = 0) ∧ subarray(mkempbuf(n1), 0, n3) = mkempbuf(n3)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 32:
n0 + # buf1 = align↑(datasize(buf, n0 + # buf1), EB_PAGE_SIZE), LEB_SIZE = n3 + # buf1, apebs[n2] = mkpeb(aehdr, avhdr, buf0, 0, false), avhdr.valid?, aehdr.valid?, n2 < # apebs, is-aligned(# buf1, EB_PAGE_SIZE), ubi-io-inv(apebs), ubi-io-peb-inv(mkpeb(aehdr, avhdr, buf0, 0, false)), # buf1 ≤ # buf, # buf1 ≤ LEB_SIZE, n0 + # buf1 ≤ # buf, n0 + # buf1 ≤ LEB_SIZE, ⌊err0⌋ , datasize(buf1, # buf1) < datasize(buf, n0 + # buf1) ∨ checksum(buf1 + mkempbuf(n0), datasize(buf, n0 + # buf1)) ≠ checksum(buf, datasize(buf, n0 + # buf1)) ⊦ datasize(buf, n0 + # buf1) = 0, (aehdr = empty → avhdr = empty) ∧ (aehdr ≠ garbage ∧ avhdr = empty → # buf1 = 0)

Rule argument

Additional information

Used simplifier rules: ⊦ mkempbuf(n) = mkempbuf(m) ↔ n = m; (s)%# buf = n ⊦ subarray(buf, 0, n) = buf; (s)%eqs: ⊦ m = n + n0 ∧ m = n + n1 → n0 = n1; (forward) from specification nat-basic%c: ⊦ m + n = n + m; from specification nat-basic%a: ⊦ (m + n0) + n1 = m + n0 + n1; from specification nat-basic% ⊦ # mkempbuf(n) = n; (s)