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Theorem read

ebm_read#(VOLID, LNUM, OFFSET, N0, N, AVOLS; BUF; ERR) {if VOLID ∈ AVOLS ∧ LNUM < # AVOLS[VOLID] ∧ OFFSET + N ≤ LEB_SIZE ∧ N0 + N ≤ # BUF then {fail_or_success#(; ; ERR); if ERR = ESUCCESS then if ¬ AVOLS[VOLID][LNUM].mapped? then BUF := fill(BUF, empty, N0, N) else BUF := copy(AVOLS[VOLID][LNUM].data, OFFSET, BUF, N0, N) else choose BUF0 with # BUF0 = # BUF ∧ range=(BUF0, 0, BUF, 0, N0) ∧ range=(BUF0, N0 + N, BUF, N0 + N, # BUF - N0 + N) in BUF := BUF0} else abort }