b8cb695053
The port agent pointed out that forced_backdrop_necessity.rs collapsed
sprite_layer_key (a u16 read from the T8aD header, decoded) with
implied_layer_key (this crate's table of positions MEASURED in the running
game), and that 'has its own key' therefore reads as file-backed when it is
not. Splitting them is stronger than either of us stated:
read from the T8aD header: 0
implied (measured): 14 10x pfbase.tbm, 4x palogo_eff0.prm
nothing at all: 66 62 decided, 4 inert
Zero. There is no instance on the disc where a forced element also carries a
file-read layer key, so this rule has never been checked against a decoded
field -- there is no case where both can speak. That is what a keyless-element
fallback necessarily looks like, but it removes a check a reader would assume
exists.
Also corrects something I said to the port and had wrong. 'None of the 18 is
evidence for the rule in any direction' conflated two questions. Whether the
rule changes the composite: no, the sort already had the key. Whether the rule
gets the RIGHT answer: yes, and the 14 implied keys are measured positions, so
this is the rule agreeing with the oracle -- its only external corroboration,
and there are 14 instances of it.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Wuu56cE8vJGTBtn1ppsk8v
72 lines
3.0 KiB
Rust
72 lines
3.0 KiB
Rust
//! Of the forced instances the rule merely CONFIRMS, how many have a key READ
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//! FROM THE FILE, and how many an IMPLIED key that is itself a measurement?
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//!
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//! `forced_backdrop_necessity.rs` asked only whether an element had *a* key,
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//! collapsing `sprite_layer_key` (a `u16` read out of the `T8aD` header — decoded)
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//! with `implied_layer_key` (this crate's per-name table of positions **measured
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//! in the running game**). For counting whether the rule moves anything that is
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//! the right question. For describing what a confirmation is *made of*, it is not:
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//! "the file already settles it" and "another measurement already settles it" are
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//! different claims, and a reader who sees "own key" will take the first.
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//!
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//! Raised by the port agent 2026-08-30.
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//!
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//! cargo run -p sylpheed-formats --example forced_backdrop_key_source
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use std::path::PathBuf;
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use sylpheed_formats::{pak::PakArchive, ui_layout};
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fn main() {
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let root = PathBuf::from(std::env::var("SYLPHEED_DISC").expect("SYLPHEED_DISC"));
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let mut paks: Vec<PathBuf> = std::fs::read_dir(root.join("dat"))
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.expect("dat/")
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.filter_map(|e| e.ok().map(|e| e.path()))
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.filter(|p| p.extension().is_some_and(|x| x == "pak"))
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.collect();
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paks.sort();
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let (mut read, mut implied, mut none) = (0usize, 0usize, 0usize);
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println!("# archive entry element key_source key");
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for pak in &paks {
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let Ok(ar) = PakArchive::open(pak) else { continue };
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let name = pak.file_name().unwrap().to_string_lossy().to_string();
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for (i, e) in ar.entries().iter().enumerate() {
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let Ok(by) = ar.read(e) else { continue };
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let Some(b) = ui_layout::parse_build(&by) else {
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continue;
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};
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for el in &b.elements {
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if !ui_layout::forced_backdrop(&b, el) {
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continue;
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}
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let (src, key) = match ui_layout::sprite_layer_key(&b, &by, el) {
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Some(k) => {
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read += 1;
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("read_T8aD", Some(k))
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}
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None => match ui_layout::implied_layer_key(&el.name) {
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Some(k) => {
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implied += 1;
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("implied_MEASURED", Some(k))
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}
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None => {
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none += 1;
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("none", None)
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}
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},
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};
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println!(
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" {name} {i} {} {src} {}",
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el.name,
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key.map(|k| format!("0x{k:08X}")).unwrap_or("-".into())
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);
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}
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}
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}
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println!("\n# forced instances by key source:");
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println!("# read from the T8aD header (decoded): {read}");
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println!("# implied — this crate's MEASURED name table: {implied}");
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println!("# none — only forced_backdrop can speak: {none}");
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}
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