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Summarize placed-structure side-buffer patterns

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This commit is contained in:
Jan Petykiewicz 2026-04-18 11:59:47 -07:00
commit c173623692
3 changed files with 345 additions and 39 deletions
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369
crates/rrt-runtime/src/smp.rs
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@ -1796,12 +1796,17 @@ pub struct SmpSavePlacedStructureDynamicSideBufferProbe {
pub prefix_separator_byte_hex: String,
pub first_embedded_name_tag_relative_offset: usize,
pub embedded_name_tag_count: usize,
pub unique_compact_prefix_pattern_count: usize,
pub prefix_leading_dword_matching_embedded_profile_tag_count: usize,
#[serde(default)]
pub first_embedded_primary_name: Option<String>,
#[serde(default)]
pub first_embedded_secondary_name: Option<String>,
#[serde(default)]
pub embedded_name_row_samples: Vec<SmpSavePlacedStructureDynamicSideBufferSampleEntry>,
#[serde(default)]
pub compact_prefix_pattern_summaries:
Vec<SmpSavePlacedStructureDynamicSideBufferPrefixPatternSummary>,
pub evidence: Vec<String>,
}
@ -1821,6 +1826,26 @@ pub struct SmpSavePlacedStructureDynamicSideBufferSampleEntry {
pub secondary_name: Option<String>,
}
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct SmpSavePlacedStructureDynamicSideBufferPrefixPatternSummary {
pub prefix_leading_dword: u32,
pub prefix_leading_dword_hex: String,
pub prefix_trailing_word: u16,
pub prefix_trailing_word_hex: String,
pub prefix_separator_byte: u8,
pub prefix_separator_byte_hex: String,
pub count: usize,
pub first_name_tag_relative_offset: usize,
pub prefix_leading_dword_matches_embedded_profile_tag: bool,
pub section_like_primary_name_count: usize,
pub cap_like_primary_name_count: usize,
pub other_primary_name_count: usize,
#[serde(default)]
pub first_primary_name: Option<String>,
#[serde(default)]
pub first_secondary_name: Option<String>,
}
#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
pub struct SmpRt3105SaveNameTableProbe {
pub profile_family: String,
@ -2767,8 +2792,7 @@ pub struct SmpSaveCompanyChairmanAnalysisReport {
#[serde(default)]
pub placed_structure_record_triplets: Option<SmpSavePlacedStructureRecordTripletProbe>,
#[serde(default)]
pub placed_structure_dynamic_side_buffer:
Option<SmpSavePlacedStructureDynamicSideBufferProbe>,
pub placed_structure_dynamic_side_buffer: Option<SmpSavePlacedStructureDynamicSideBufferProbe>,
#[serde(default)]
pub unclassified_tagged_collection_headers: Vec<SmpSaveUnclassifiedTaggedCollectionHeaderProbe>,
#[serde(default)]
@ -3138,10 +3162,12 @@ pub fn inspect_unclassified_save_collection_headers_file(
file_extension_hint.as_deref(),
container_profile.as_ref(),
);
Ok(filter_unclassified_tagged_collection_header_probes_outside_known_spans(
probes,
&known_header_probes,
))
Ok(
filter_unclassified_tagged_collection_header_probes_outside_known_spans(
probes,
&known_header_probes,
),
)
}
pub fn inspect_save_placed_structure_dynamic_side_buffer_file(
@ -3333,8 +3359,9 @@ pub fn load_save_slice_from_report(
enabled_visible_labels: probe.enabled_visible_labels.clone(),
entries: probe.entries.clone(),
});
let placed_structure_dynamic_side_buffer_probe =
report.save_placed_structure_dynamic_side_buffer_probe.clone();
let placed_structure_dynamic_side_buffer_probe = report
.save_placed_structure_dynamic_side_buffer_probe
.clone();
let mut notes = summary.notes.clone();
if let Some(probe) = &report.save_world_selection_context_probe {
notes.push(format!(
@ -3491,15 +3518,28 @@ pub fn load_save_slice_from_report(
));
}
if let Some(probe) = &placed_structure_dynamic_side_buffer_probe {
let dominant_pattern = probe.compact_prefix_pattern_summaries.first();
notes.push(format!(
"Raw save also exposes the separate placed-structure dynamic-side-buffer candidate 0x38a5/0x38a6/0x38a7: live_record_count={}, first compact prefix=({},{},{}), first embedded names={:?}/{:?}, embedded 0x55f1 row count={}.",
"Raw save also exposes the separate placed-structure dynamic-side-buffer candidate 0x38a5/0x38a6/0x38a7: live_record_count={}, first compact prefix=({},{},{}), first embedded names={:?}/{:?}, embedded 0x55f1 row count={}, unique compact prefix patterns={}, 0x55f3-leading rows={}, dominant compact pattern={}/{}/{} x{}.",
probe.live_record_count,
probe.prefix_leading_dword_hex,
probe.prefix_trailing_word_hex,
probe.prefix_separator_byte_hex,
probe.first_embedded_primary_name.as_deref(),
probe.first_embedded_secondary_name.as_deref(),
probe.embedded_name_tag_count
probe.embedded_name_tag_count,
probe.unique_compact_prefix_pattern_count,
probe.prefix_leading_dword_matching_embedded_profile_tag_count,
dominant_pattern
.map(|pattern| pattern.prefix_leading_dword_hex.as_str())
.unwrap_or("0x00000000"),
dominant_pattern
.map(|pattern| pattern.prefix_trailing_word_hex.as_str())
.unwrap_or("0x0000"),
dominant_pattern
.map(|pattern| pattern.prefix_separator_byte_hex.as_str())
.unwrap_or("0x00"),
dominant_pattern.map(|pattern| pattern.count).unwrap_or_default()
));
}
if let Some(roster) = &report.save_company_roster_probe {
@ -3936,6 +3976,25 @@ pub fn inspect_save_company_and_chairman_analysis_bytes(
triplets.entries.first().map(|entry| entry.profile_status_kind.as_str())
));
}
if let Some(side_buffer) = placed_structure_dynamic_side_buffer.as_ref() {
let dominant_pattern = side_buffer.compact_prefix_pattern_summaries.first();
notes.push(format!(
"Placed-structure analysis now also exports the separate 0x38a5 dynamic side-buffer owner seam with {} embedded name rows, {} unique compact prefix patterns, {} rows whose leading dword matches 0x55f3, and dominant compact pattern={}/{}/{} x{}.",
side_buffer.embedded_name_tag_count,
side_buffer.unique_compact_prefix_pattern_count,
side_buffer.prefix_leading_dword_matching_embedded_profile_tag_count,
dominant_pattern
.map(|pattern| pattern.prefix_leading_dword_hex.as_str())
.unwrap_or("0x00000000"),
dominant_pattern
.map(|pattern| pattern.prefix_trailing_word_hex.as_str())
.unwrap_or("0x0000"),
dominant_pattern
.map(|pattern| pattern.prefix_separator_byte_hex.as_str())
.unwrap_or("0x00"),
dominant_pattern.map(|pattern| pattern.count).unwrap_or_default()
));
}
if let Some(candidate) = unclassified_tagged_collection_headers.first() {
notes.push(format!(
"Generic save-side tagged collection scan also found {} unclassified candidate families; largest current candidate uses tags {}/{}/{} with live_record_count={} stride=0x{:x} records_span_len=0x{:x}.",
@ -10609,6 +10668,27 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
file_extension_hint: Option<&str>,
container_profile: Option<&SmpContainerProfile>,
) -> Option<SmpSavePlacedStructureDynamicSideBufferProbe> {
#[derive(Clone)]
struct EmbeddedNameRow {
name_tag_relative_offset: usize,
prefix_leading_dword: u32,
prefix_trailing_word: u16,
prefix_separator_byte: u8,
primary_name: Option<String>,
secondary_name: Option<String>,
}
#[derive(Default)]
struct PrefixPatternAccumulator {
count: usize,
first_name_tag_relative_offset: usize,
first_primary_name: Option<String>,
first_secondary_name: Option<String>,
section_like_primary_name_count: usize,
cap_like_primary_name_count: usize,
other_primary_name_count: usize,
}
if file_extension_hint != Some("gms") {
return None;
}
@ -10630,13 +10710,15 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
let Some(records_tag_offset) = records_offsets
.iter()
.copied()
.find(|offset| *offset > metadata_tag_offset) else {
.find(|offset| *offset > metadata_tag_offset)
else {
continue;
};
let Some(close_tag_offset) = close_offsets
.iter()
.copied()
.find(|offset| *offset > records_tag_offset) else {
.find(|offset| *offset > records_tag_offset)
else {
continue;
};
let Some(payload) = bytes.get(metadata_tag_offset + 4..records_tag_offset) else {
@ -10647,7 +10729,8 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
}
let Some(header_words) = (0..INDEXED_COLLECTION_SERIALIZED_HEADER_DWORD_COUNT)
.map(|index| read_u32_at(payload, index * 4))
.collect::<Option<Vec<_>>>() else {
.collect::<Option<Vec<_>>>()
else {
continue;
};
let Some(header_words): Option<[u32; INDEXED_COLLECTION_SERIALIZED_HEADER_DWORD_COUNT]> =
@ -10683,10 +10766,12 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
};
let embedded_name_tag_offsets =
find_u16_le_offsets(records_payload, SAVE_REGION_RECORD_NAME_TAG);
let Some(&first_embedded_name_tag_relative_offset) = embedded_name_tag_offsets.first() else {
let Some(&first_embedded_name_tag_relative_offset) = embedded_name_tag_offsets.first()
else {
continue;
};
let Some(prefix_payload) = records_payload.get(..first_embedded_name_tag_relative_offset) else {
let Some(prefix_payload) = records_payload.get(..first_embedded_name_tag_relative_offset)
else {
continue;
};
if prefix_payload.len() < 7 {
@ -10704,7 +10789,8 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
let mut parsed_embedded_names = None;
for relative_name_offset in [4usize, 6usize] {
let Some(name_payload) = records_payload
.get(first_embedded_name_tag_relative_offset + relative_name_offset..) else {
.get(first_embedded_name_tag_relative_offset + relative_name_offset..)
else {
continue;
};
if let Some(names) = parse_save_len_prefixed_ascii_name_pair(name_payload) {
@ -10717,11 +10803,10 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
else {
continue;
};
let embedded_name_row_samples = embedded_name_tag_offsets
let embedded_name_rows = embedded_name_tag_offsets
.iter()
.copied()
.enumerate()
.filter_map(|(sample_index, name_tag_relative_offset)| {
.filter_map(|name_tag_relative_offset| {
let prefix_payload = records_payload.get(..name_tag_relative_offset)?;
if prefix_payload.len() < 7 {
return None;
@ -10731,8 +10816,9 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
let prefix_separator_byte = *prefix_payload.last()?;
let mut parsed_names = None;
for relative_name_offset in [4usize, 6usize] {
let Some(name_payload) = records_payload
.get(name_tag_relative_offset + relative_name_offset..) else {
let Some(name_payload) =
records_payload.get(name_tag_relative_offset + relative_name_offset..)
else {
continue;
};
if let Some(names) = parse_save_len_prefixed_ascii_name_pair(name_payload) {
@ -10741,21 +10827,108 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
}
}
let (primary_name, secondary_name) = parsed_names.unwrap_or_default();
Some(SmpSavePlacedStructureDynamicSideBufferSampleEntry {
sample_index,
Some(EmbeddedNameRow {
name_tag_relative_offset,
prefix_leading_dword,
prefix_leading_dword_hex: format!("0x{prefix_leading_dword:08x}"),
prefix_trailing_word,
prefix_trailing_word_hex: format!("0x{prefix_trailing_word:04x}"),
prefix_separator_byte,
prefix_separator_byte_hex: format!("0x{prefix_separator_byte:02x}"),
primary_name: (!primary_name.is_empty()).then_some(primary_name),
secondary_name: (!secondary_name.is_empty()).then_some(secondary_name),
})
})
.take(8)
.collect::<Vec<_>>();
let embedded_name_row_samples = embedded_name_rows
.iter()
.take(8)
.enumerate()
.map(
|(sample_index, row)| SmpSavePlacedStructureDynamicSideBufferSampleEntry {
sample_index,
name_tag_relative_offset: row.name_tag_relative_offset,
prefix_leading_dword: row.prefix_leading_dword,
prefix_leading_dword_hex: format!("0x{:08x}", row.prefix_leading_dword),
prefix_trailing_word: row.prefix_trailing_word,
prefix_trailing_word_hex: format!("0x{:04x}", row.prefix_trailing_word),
prefix_separator_byte: row.prefix_separator_byte,
prefix_separator_byte_hex: format!("0x{:02x}", row.prefix_separator_byte),
primary_name: row.primary_name.clone(),
secondary_name: row.secondary_name.clone(),
},
)
.collect::<Vec<_>>();
let mut compact_prefix_pattern_map =
BTreeMap::<(u32, u16, u8), PrefixPatternAccumulator>::new();
for row in &embedded_name_rows {
let entry = compact_prefix_pattern_map
.entry((
row.prefix_leading_dword,
row.prefix_trailing_word,
row.prefix_separator_byte,
))
.or_insert_with(|| PrefixPatternAccumulator {
first_name_tag_relative_offset: row.name_tag_relative_offset,
first_primary_name: row.primary_name.clone(),
first_secondary_name: row.secondary_name.clone(),
..Default::default()
});
entry.count += 1;
match row.primary_name.as_deref() {
Some(name) if name.ends_with("_Section.3dp") => {
entry.section_like_primary_name_count += 1;
}
Some(name) if name.ends_with("_Cap.3dp") => {
entry.cap_like_primary_name_count += 1;
}
_ => {
entry.other_primary_name_count += 1;
}
}
}
let prefix_leading_dword_matching_embedded_profile_tag_count = embedded_name_rows
.iter()
.filter(|row| row.prefix_leading_dword == u32::from(SAVE_REGION_RECORD_PROFILE_TAG))
.count();
let mut compact_prefix_pattern_summaries = compact_prefix_pattern_map
.into_iter()
.map(
|(
(prefix_leading_dword, prefix_trailing_word, prefix_separator_byte),
accumulator,
)| {
SmpSavePlacedStructureDynamicSideBufferPrefixPatternSummary {
prefix_leading_dword,
prefix_leading_dword_hex: format!("0x{prefix_leading_dword:08x}"),
prefix_trailing_word,
prefix_trailing_word_hex: format!("0x{prefix_trailing_word:04x}"),
prefix_separator_byte,
prefix_separator_byte_hex: format!("0x{prefix_separator_byte:02x}"),
count: accumulator.count,
first_name_tag_relative_offset: accumulator.first_name_tag_relative_offset,
prefix_leading_dword_matches_embedded_profile_tag: prefix_leading_dword
== u32::from(SAVE_REGION_RECORD_PROFILE_TAG),
section_like_primary_name_count: accumulator
.section_like_primary_name_count,
cap_like_primary_name_count: accumulator.cap_like_primary_name_count,
other_primary_name_count: accumulator.other_primary_name_count,
first_primary_name: accumulator.first_primary_name,
first_secondary_name: accumulator.first_secondary_name,
}
},
)
.collect::<Vec<_>>();
compact_prefix_pattern_summaries.sort_by(|left, right| {
right
.count
.cmp(&left.count)
.then_with(|| {
left.first_name_tag_relative_offset
.cmp(&right.first_name_tag_relative_offset)
})
.then_with(|| left.prefix_leading_dword.cmp(&right.prefix_leading_dword))
.then_with(|| left.prefix_trailing_word.cmp(&right.prefix_trailing_word))
.then_with(|| left.prefix_separator_byte.cmp(&right.prefix_separator_byte))
});
let dominant_compact_prefix_pattern = compact_prefix_pattern_summaries.first().cloned();
return Some(SmpSavePlacedStructureDynamicSideBufferProbe {
profile_family: profile.profile_family.clone(),
source_kind: "save-placed-structure-dynamic-side-buffer-records".to_string(),
@ -10778,9 +10951,12 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
prefix_separator_byte_hex: format!("0x{prefix_separator_byte:02x}"),
first_embedded_name_tag_relative_offset,
embedded_name_tag_count: embedded_name_tag_offsets.len(),
unique_compact_prefix_pattern_count: compact_prefix_pattern_summaries.len(),
prefix_leading_dword_matching_embedded_profile_tag_count,
first_embedded_primary_name: Some(first_embedded_primary_name.clone()),
first_embedded_secondary_name: Some(first_embedded_secondary_name.clone()),
embedded_name_row_samples,
compact_prefix_pattern_summaries,
evidence: vec![
"exact little-endian u32 tag family 0x38a5/0x38a6/0x38a7 appears as a separate save-side tagged collection on grounded saves".to_string(),
"records payload begins with a compact 6-byte prefix plus one separator byte before the first embedded 0x55f1 name row".to_string(),
@ -10791,6 +10967,29 @@ fn parse_save_placed_structure_dynamic_side_buffer_probe(
Some(first_embedded_secondary_name),
embedded_name_tag_offsets.len()
),
format!(
"{} of {} embedded name rows use compact leading dword 0x{:08x}, matching the placed-structure embedded profile tag",
prefix_leading_dword_matching_embedded_profile_tag_count,
embedded_name_rows.len(),
u32::from(SAVE_REGION_RECORD_PROFILE_TAG)
),
dominant_compact_prefix_pattern
.map(|pattern| {
format!(
"dominant compact prefix pattern {} / {} / {} occurs {} times; section-like rows={}, cap-like rows={}, first names={:?}/{:?}",
pattern.prefix_leading_dword_hex,
pattern.prefix_trailing_word_hex,
pattern.prefix_separator_byte_hex,
pattern.count,
pattern.section_like_primary_name_count,
pattern.cap_like_primary_name_count,
pattern.first_primary_name,
pattern.first_secondary_name
)
})
.unwrap_or_else(|| {
"no dominant compact prefix pattern summary was available".to_string()
}),
],
});
}
@ -11072,13 +11271,10 @@ fn filter_unclassified_tagged_collection_header_probes_outside_known_spans(
probes
.into_iter()
.filter(|probe| {
!known_header_probes
.iter()
.flatten()
.any(|known| {
probe.metadata_tag_offset >= known.metadata_tag_offset
&& probe.close_tag_offset <= known.close_tag_offset
})
!known_header_probes.iter().flatten().any(|known| {
probe.metadata_tag_offset >= known.metadata_tag_offset
&& probe.close_tag_offset <= known.close_tag_offset
})
})
.collect()
}
@ -18683,8 +18879,7 @@ mod tests {
.copy_from_slice(&0x000038a5u32.to_le_bytes());
bytes[records_tag_offset..records_tag_offset + 4]
.copy_from_slice(&0x000038a6u32.to_le_bytes());
bytes[close_tag_offset..close_tag_offset + 4]
.copy_from_slice(&0x000038a7u32.to_le_bytes());
bytes[close_tag_offset..close_tag_offset + 4].copy_from_slice(&0x000038a7u32.to_le_bytes());
let header_words = [
0u32, 0x06, 1000, 500, 1000, 388, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
@ -18728,6 +18923,11 @@ mod tests {
assert_eq!(probe.prefix_separator_byte_hex, "0xff");
assert_eq!(probe.first_embedded_name_tag_relative_offset, 7);
assert_eq!(probe.embedded_name_tag_count, 1);
assert_eq!(probe.unique_compact_prefix_pattern_count, 1);
assert_eq!(
probe.prefix_leading_dword_matching_embedded_profile_tag_count,
0
);
assert_eq!(
probe.first_embedded_primary_name.as_deref(),
Some("TrackCapST_Cap.3dp")
@ -18736,6 +18936,103 @@ mod tests {
probe.first_embedded_secondary_name.as_deref(),
Some("Infrastructure")
);
assert_eq!(probe.compact_prefix_pattern_summaries.len(), 1);
assert_eq!(
probe.compact_prefix_pattern_summaries[0].prefix_leading_dword_hex,
"0x0005d368"
);
assert_eq!(probe.compact_prefix_pattern_summaries[0].count, 1);
assert_eq!(
probe.compact_prefix_pattern_summaries[0].cap_like_primary_name_count,
1
);
assert_eq!(
probe.compact_prefix_pattern_summaries[0].section_like_primary_name_count,
0
);
}
#[test]
fn summarizes_placed_structure_dynamic_side_buffer_compact_prefix_patterns() {
let mut bytes = vec![0u8; 0x600];
let metadata_tag_offset = 0x40usize;
let records_tag_offset = 0x140usize;
let close_tag_offset = 0x320usize;
bytes[metadata_tag_offset..metadata_tag_offset + 4]
.copy_from_slice(&0x000038a5u32.to_le_bytes());
bytes[records_tag_offset..records_tag_offset + 4]
.copy_from_slice(&0x000038a6u32.to_le_bytes());
bytes[close_tag_offset..close_tag_offset + 4].copy_from_slice(&0x000038a7u32.to_le_bytes());
let header_words = [
0u32, 0x06, 1000, 500, 1000, 388, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
];
for (index, word) in header_words.into_iter().enumerate() {
let offset = metadata_tag_offset + 4 + index * 4;
bytes[offset..offset + 4].copy_from_slice(&word.to_le_bytes());
}
let mut cursor = records_tag_offset + 4;
for (leading_dword, primary_name) in [
(0x000055f3u32, "TunnelSTBrick_Section.3dp"),
(0x000055f3u32, "TunnelSTBrick_Cap.3dp"),
(0xff0000ffu32, "TunnelSTBrick_Cap.3dp"),
] {
bytes[cursor..cursor + 4].copy_from_slice(&leading_dword.to_le_bytes());
bytes[cursor + 4..cursor + 6].copy_from_slice(&0x0001u16.to_le_bytes());
bytes[cursor + 6] = 0xff;
let name_tag_offset = cursor + 7;
bytes[name_tag_offset..name_tag_offset + 2]
.copy_from_slice(&SAVE_REGION_RECORD_NAME_TAG.to_le_bytes());
let secondary_name = "Infrastructure";
bytes[name_tag_offset + 4] = primary_name.len() as u8;
bytes[name_tag_offset + 5..name_tag_offset + 5 + primary_name.len()]
.copy_from_slice(primary_name.as_bytes());
let second_len_offset = name_tag_offset + 5 + primary_name.len();
bytes[second_len_offset] = secondary_name.len() as u8;
bytes[second_len_offset + 1..second_len_offset + 1 + secondary_name.len()]
.copy_from_slice(secondary_name.as_bytes());
cursor = second_len_offset + 1 + secondary_name.len();
}
let probe = parse_save_placed_structure_dynamic_side_buffer_probe(
&bytes,
Some("gms"),
Some(&SmpContainerProfile {
profile_family: "rt3-105-save-container-v1".to_string(),
profile_evidence: vec![],
is_known_profile: true,
}),
)
.expect("placed-structure dynamic side-buffer probe should parse");
assert_eq!(probe.embedded_name_tag_count, 3);
assert_eq!(probe.unique_compact_prefix_pattern_count, 2);
assert_eq!(
probe.prefix_leading_dword_matching_embedded_profile_tag_count,
2
);
assert_eq!(probe.compact_prefix_pattern_summaries.len(), 2);
assert_eq!(
probe.compact_prefix_pattern_summaries[0].prefix_leading_dword_hex,
"0x000055f3"
);
assert_eq!(probe.compact_prefix_pattern_summaries[0].count, 2);
assert_eq!(
probe.compact_prefix_pattern_summaries[0].section_like_primary_name_count,
1
);
assert_eq!(
probe.compact_prefix_pattern_summaries[0].cap_like_primary_name_count,
1
);
assert!(
probe.compact_prefix_pattern_summaries[0]
.prefix_leading_dword_matches_embedded_profile_tag
);
assert_eq!(
probe.compact_prefix_pattern_summaries[1].prefix_leading_dword_hex,
"0xff0000ff"
);
assert_eq!(probe.compact_prefix_pattern_summaries[1].count, 1);
}
#[test]