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Proof step 3 from proof decode-node (previous step)

m = m1, m0 = n ⊦ ⟪if m < 2 * NODE_HEADER_SIZE then {debug#("persistence: decode_node expected size wrong"); err := EINVAL} else if ¬ m0 + m ≤ # buf then {debug#("persistence: decode_node buffer insufficient"); err := EINVAL} else let ndhd = ? in {decode_header#(m0, buf; ndhd; err); if err = ESUCCESS ∧ ndhd.ispadding then {debug#("persistence: decode_node got padding node"); err := EIO}; if err = ESUCCESS ∧ align↑(ndhd.size, 2 * NODE_HEADER_SIZE) + 2 * NODE_HEADER_SIZE ≠ m then {debug#("persistence: decode_node node of wrong size"); err := EIO}; if err = ESUCCESS then {decode_node_headerless#(m0 + NODE_HEADER_SIZE, buf; nd, m; err); if err ≠ ESUCCESS then debug#("persistence: decode_node decoding failed") else if m ≠ ndhd.size then {debug#("persistence: decode_node size of node unexpected"); err := EINVAL}}; if err = ESUCCESS ∧ ¬ range=(buf, m0 + NODE_HEADER_SIZE + align↑(ndhd.size, 2 * NODE_HEADER_SIZE), validtrailer, 0, NODE_HEADER_SIZE) then {debug#("persistence: decode_node no validtrailer"); err := EIO}}⟫ ( (err = ESUCCESS ∨ ⌊err⌋ ) ∧ ( err = ESUCCESS → (∃ buf0, buf1. subarray(buf, n, 2 * NODE_HEADER_SIZE + nd.alignedsize) = buf0 + buf1 + validtrailer ∧ is-encoded(nodeheader(node-size-headerless(nd), false), buf0) ∧ is-encoded(nd, subarray(buf1, 0, node-size-headerless(nd))) ∧ # buf1 = nd.alignedsize) ∧ m1 = 2 * NODE_HEADER_SIZE + nd.alignedsize ∧ n + 2 * NODE_HEADER_SIZE + nd.alignedsize ≤ # buf))

Heuristic symbolic execution applied rule if right

And obtained the following new goals

Rule argument

pos: right 1

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