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Use craft-eps for EPS section and box parsing

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Dylan M. Taylor committed 2026-11-13 00:35:54 -05:00
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commit 3617464d73
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+4 -74
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crates/images/src/eps.rs
+4 -74
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@@ -3,85 +3,15 @@
//! rectangles of a simple one drawn here (InDesign's QR codes), else a placeholder the size of its
//! bounding box.
fn u32le(b: &[u8], at: usize) -> Option<usize> {
Some(u32::from_le_bytes(b.get(at..at + 4)?.try_into().ok()?) as usize)
}
/// The PostScript section and the TIFF preview (DOS EPS).
/// The PostScript section and the TIFF preview (DOS EPS), read by craft-eps.
fn sections(bytes: &[u8]) -> (&[u8], Option<&[u8]>) {
if bytes.starts_with(&[0xC5, 0xD0, 0xD3, 0xC6]) {
let ps = u32le(bytes, 4).zip(u32le(bytes, 8)).and_then(|(o, l)| bytes.get(o..o.checked_add(l)?)).unwrap_or(&[]);
let tiff = u32le(bytes, 20).zip(u32le(bytes, 24)).filter(|(o, l)| *o > 0 && *l > 0).and_then(|(o, l)| bytes.get(o..o.checked_add(l)?));
return (ps, tiff);
}
(bytes, None)
craft_eps::sections(bytes).map_or((&[][..], None), |parts| (parts.postscript, parts.tiff))
}
/// The bounding box in points: (x0, y0, x1, y1), the high-resolution one when given.
pub fn bounding_box(bytes: &[u8]) -> Option<[f64; 4]> {
let (ps, _) = sections(bytes);
let head = String::from_utf8_lossy(&ps[..ps.len().min(64 * 1024)]);
// DSC allows (atend): scan a bounded trailer as well, without reading the whole program.
let tail = String::from_utf8_lossy(&ps[ps.len().saturating_sub(64 * 1024)..]);
let header_value = |key: &str| {
// Lines may end in `\r` alone (classic Mac files).
head.split(['\n', '\r'])
.take_while(|l| {
(l.starts_with('%') || l.trim().is_empty())
&& ![
"%%EndComments",
"%%BeginDocument",
"%%BeginProlog",
"%%BeginSetup",
"%%BeginData",
"%%BeginBinary",
"%%BeginResource",
"%%Page:",
]
.iter()
.any(|k| l.starts_with(k))
})
.find_map(|l| l.strip_prefix(key))
};
let hires = header_value("%%HiResBoundingBox:");
let bbox = header_value("%%BoundingBox:");
let at_end = |v: Option<&str>| v.is_some_and(|v| v.trim() == "(atend)");
// An outer header box must not be replaced by a nested document's trailer comments.
// Inspect the trailer only when the outer header delegates its bounds there.
hires
.and_then(parse_box)
.or_else(|| (at_end(hires) || at_end(bbox)).then(|| trailer_box(&tail, "%%HiResBoundingBox:")).flatten())
.or_else(|| bbox.and_then(parse_box))
.or_else(|| at_end(bbox).then(|| trailer_box(&tail, "%%BoundingBox:")).flatten())
}
fn parse_box(value: &str) -> Option<[f64; 4]> {
let mut words = value.split_whitespace();
let mut bb = [0.0f64; 4];
for n in &mut bb {
*n = words.next()?.parse().ok()?;
}
// Finite corners and a finite size (subtracting extreme corners can overflow to infinity).
let finite = [bb[0], bb[1], bb[2], bb[3], bb[2] - bb[0], bb[3] - bb[1]].iter().all(|n| n.is_finite());
(words.next().is_none() && finite && bb[2] > bb[0] && bb[3] > bb[1]).then_some(bb)
}
fn trailer_box(tail: &str, key: &str) -> Option<[f64; 4]> {
// Work backwards from the outer EOF so nesting remains known even when the bounded
// window begins inside a child document. Opaque DSC data/resource blocks are skipped too.
let mut nested = 0usize;
for line in tail.split(['\n', '\r']).rev() {
if ["%%EndDocument", "%%EndData", "%%EndBinary", "%%EndResource"].iter().any(|k| line.starts_with(k)) {
nested = nested.checked_add(1)?;
} else if ["%%BeginDocument", "%%BeginData", "%%BeginBinary", "%%BeginResource"].iter().any(|k| line.starts_with(k)) {
nested = nested.checked_sub(1)?;
} else if nested == 0
&& let Some(bb) = line.strip_prefix(key).and_then(parse_box)
{
return Some(bb);
}
}
None
let parts = craft_eps::sections(bytes).ok()?;
craft_eps::Comments::read(parts.postscript).page_box()
}
/// Natural EPS dimensions in points. Bound sizes before fitting or allocating a proxy: