{"abstract":"Cursor excludes consumed sync prefix.","category":"PCM sample encoding","checks":8,"contract":"Read up to declared unsigned packed fields after a bit prefix; incomplete fields are ignored, and report cursor in bits from packet start.","contract_signature":"octets, width, count, prefix_bits","evaluation_group":"s3-pcm-subbyte-code-reader","failed_approach":"Reporting the whole packet as consumed loses a following unconsumed field.","family":"s3-pcm-subbyte-code-reader-reported-consumption","id":"FA-48886","implementations":{"attempt":{"sha256":"75d3e9e39ccd6d8c9fb55bd82a7c6bb10928e88df733969c55f330ed9b4072b2","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(octets, width, count, prefix_bits):\n    bits = [(byte >> (7-j)) & 1 for byte in octets for j in range(8)]\n    bits = bits[prefix_bits:]\n    available = len(bits)//width\n    count = min(count,available)\n    values=[]\n    for i in range(count):\n        values.append(sum(bits[i*width+j] << (width-1-j) for j in range(width)))\n    consumed = prefix_bits+len(octets)*8\n    return [values,consumed]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([179, 144], 3, 3, 2)), [[6, 3, 4], 11])\ncheck('oracle 2', solve(*([255], 2, 2, 0)), [[3, 3], 4])\ncheck('oracle 3', solve(*([0], 1, 8, 0)), [[0, 0, 0, 0, 0, 0, 0, 0], 8])\ncheck('oracle 4', solve(*([], 3, 0, 0)), [[], 0])\ncheck('oracle 5', solve(*([160], 3, 1, 1)), [[2], 4])\ncheck('oracle 6', solve(*([18, 52], 4, 2, 4)), [[2, 3], 12])\ncheck('oracle 7', solve(*([255], 3, 5, 1)), [[7, 7], 7])\nif N == 1: check('variant packet 1', solve(*[[179, 144, 179, 144], 3, 6, 2]), [[6, 3, 4, 4, 1, 3], 20])\nif N == 2: check('variant packet 2', solve(*[[179, 144, 179, 144, 179, 144], 3, 9, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2], 29])\nif N == 3: check('variant packet 3', solve(*[[179, 144, 179, 144, 179, 144, 179, 144], 3, 12, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4], 38])\nif N == 4: check('variant packet 4', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 15, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0], 47])\nif N == 5: check('variant packet 5', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 18, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0, 2, 6, 3], 56])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"2f53416f7590e73a50b8345c3b158d03f3acf0a08b339ed5317189e251ad2c41","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(octets, width, count, prefix_bits):\n    bits = [(byte >> (7-j)) & 1 for byte in octets for j in range(8)]\n    bits = bits[prefix_bits:]\n    available = len(bits)//width\n    count = min(count,available)\n    values=[]\n    for i in range(count):\n        values.append(sum(bits[i*width+j] << (width-1-j) for j in range(width)))\n    consumed = count*width\n    return [values,consumed]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('oracle 1', solve(*([179, 144], 3, 3, 2)), [[6, 3, 4], 11])\ncheck('oracle 2', solve(*([255], 2, 2, 0)), [[3, 3], 4])\ncheck('oracle 3', solve(*([0], 1, 8, 0)), [[0, 0, 0, 0, 0, 0, 0, 0], 8])\ncheck('oracle 4', solve(*([], 3, 0, 0)), [[], 0])\ncheck('oracle 5', solve(*([160], 3, 1, 1)), [[2], 4])\ncheck('oracle 6', solve(*([18, 52], 4, 2, 4)), [[2, 3], 12])\ncheck('oracle 7', solve(*([255], 3, 5, 1)), [[7, 7], 7])\nif N == 1: check('variant packet 1', solve(*[[179, 144, 179, 144], 3, 6, 2]), [[6, 3, 4, 4, 1, 3], 20])\nif N == 2: check('variant packet 2', solve(*[[179, 144, 179, 144, 179, 144], 3, 9, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2], 29])\nif N == 3: check('variant packet 3', solve(*[[179, 144, 179, 144, 179, 144, 179, 144], 3, 12, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4], 38])\nif N == 4: check('variant packet 4', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 15, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0], 47])\nif N == 5: check('variant packet 5', solve(*[[179, 144, 179, 144, 179, 144, 179, 144, 179, 144, 179, 144], 3, 18, 2]), [[6, 3, 4, 4, 1, 3, 1, 6, 2, 0, 5, 4, 7, 1, 0, 2, 6, 3], 56])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Stipulated finite model; no claim of hardware timing or full file-format conformance. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"s3-pcm-subbyte-code-reader-reported-consumption","generated_at":"2026-09-29T14:44:54.777230+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Offline PCM interchange uses these exact bounded packet and sample representation decisions.","root_cause":"Cursor excludes consumed sync prefix.","sha256":"51008363f680a9fbdcd2c76ecff0d913820e07aa253bce04de55364fada4f020","title":"Subbyte code reader: reported consumption · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":39.967,"exit_code":1,"observations":[{"actual":[[6,3,4],18],"check":"oracle 1","expected":[[6,3,4],11],"passed":false},{"actual":[[3,3],8],"check":"oracle 2","expected":[[3,3],4],"passed":false},{"actual":[[0,0,0,0,0,0,0,0],8],"check":"oracle 3","expected":[[0,0,0,0,0,0,0,0],8],"passed":true},{"actual":[[],0],"check":"oracle 4","expected":[[],0],"passed":true},{"actual":[[2],9],"check":"oracle 5","expected":[[2],4],"passed":false},{"actual":[[2,3],20],"check":"oracle 6","expected":[[2,3],12],"passed":false},{"actual":[[7,7],9],"check":"oracle 7","expected":[[7,7],7],"passed":false},{"actual":[[6,3,4,4,1,3],34],"check":"variant packet 1","expected":[[6,3,4,4,1,3],20],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[6, 3, 4], 18], \"expected\": [[6, 3, 4], 11], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[3, 3], 8], \"expected\": [[3, 3], 4], \"passed\": false}, {\"check\": \"oracle 3\", \"actual\": [[0, 0, 0, 0, 0, 0, 0, 0], 8], \"expected\": [[0, 0, 0, 0, 0, 0, 0, 0], 8], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[], 0], \"expected\": [[], 0], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[2], 9], \"expected\": [[2], 4], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[2, 3], 20], \"expected\": [[2, 3], 12], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[7, 7], 9], \"expected\": [[7, 7], 7], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [[6, 3, 4, 4, 1, 3], 34], \"expected\": [[6, 3, 4, 4, 1, 3], 20], \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":38.709,"exit_code":1,"observations":[{"actual":[[6,3,4],9],"check":"oracle 1","expected":[[6,3,4],11],"passed":false},{"actual":[[3,3],4],"check":"oracle 2","expected":[[3,3],4],"passed":true},{"actual":[[0,0,0,0,0,0,0,0],8],"check":"oracle 3","expected":[[0,0,0,0,0,0,0,0],8],"passed":true},{"actual":[[],0],"check":"oracle 4","expected":[[],0],"passed":true},{"actual":[[2],3],"check":"oracle 5","expected":[[2],4],"passed":false},{"actual":[[2,3],8],"check":"oracle 6","expected":[[2,3],12],"passed":false},{"actual":[[7,7],6],"check":"oracle 7","expected":[[7,7],7],"passed":false},{"actual":[[6,3,4,4,1,3],18],"check":"variant packet 1","expected":[[6,3,4,4,1,3],20],"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"oracle 1\", \"actual\": [[6, 3, 4], 9], \"expected\": [[6, 3, 4], 11], \"passed\": false}, {\"check\": \"oracle 2\", \"actual\": [[3, 3], 4], \"expected\": [[3, 3], 4], \"passed\": true}, {\"check\": \"oracle 3\", \"actual\": [[0, 0, 0, 0, 0, 0, 0, 0], 8], \"expected\": [[0, 0, 0, 0, 0, 0, 0, 0], 8], \"passed\": true}, {\"check\": \"oracle 4\", \"actual\": [[], 0], \"expected\": [[], 0], \"passed\": true}, {\"check\": \"oracle 5\", \"actual\": [[2], 3], \"expected\": [[2], 4], \"passed\": false}, {\"check\": \"oracle 6\", \"actual\": [[2, 3], 8], \"expected\": [[2, 3], 12], \"passed\": false}, {\"check\": \"oracle 7\", \"actual\": [[7, 7], 6], \"expected\": [[7, 7], 7], \"passed\": false}, {\"check\": \"variant packet 1\", \"actual\": [[6, 3, 4, 4, 1, 3], 18], \"expected\": [[6, 3, 4, 4, 1, 3], 20], \"passed\": false}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}