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| Author | SHA1 | Date | |
|---|---|---|---|
 funkpower
|
48478fe84e |
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@@ -130,18 +130,10 @@ An EPUB's is the first of these that reaches an image:
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2. The item `<meta name="cover" content="…">` names (EPUB 2). Some
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converters write the image's address there rather than its id, and that is
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followed too.
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3. The guide's `<reference type="cover">`, a page, and the `<img src>` or
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SVG `<image href>` on it. Where the page has several, the one whose file
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name, `alt`, `id` or `class` says `cover` is taken; where none does, the
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first is, with a note that there were others. A guide that points straight
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at an image is taken at its word.
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4. Any image in the manifest whose id or file name says `cover`, one named
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`cover` outright first and the rest in manifest order.
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A name says `cover` when it has it as a word of its own, in any case. Words
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break at anything not a letter or digit and where a lower case letter meets a
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capital, so `CoverImage`, `Book_COVER` and `cover-thumb` say it, and
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`discover-ch1` and `recovery-map` do not.
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3. The guide's `<reference type="cover">`, a page, and the first `<img src>`
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or SVG `<image href>` on it. A guide that points straight at an image is
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taken at its word.
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4. Any image in the manifest whose id or address says `cover`.
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A route that names something unusable — not in the archive, not an image —
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leaves a note, and the next route is asked. Addresses are resolved against the
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@@ -153,9 +145,7 @@ What the bytes say beats what the manifest says: a JPEG listed as
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`image/png` comes back as `image/jpeg`, with a note. A cover larger than
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`bookmeta::MAX_COVER` (16 MiB) is left out with a note, in either format, and
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an EPUB's is never decompressed further than that, whatever size the archive
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claims for it. Nor are more than eight members read looking for one,
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however many candidates the manifest lists: the search stops there, with a
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note.
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claims for it.
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`Cover::guessed` says the file left the choice open: a Kindle book's first
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image record, or an EPUB image picked because its name says `cover`. Either
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+14
-275
@@ -22,13 +22,6 @@ use crate::{Cover, MAX_COVER, Metadata, Source, image_type};
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/// document or is trying to be a decompression bomb.
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const MAX_PACKAGE: u64 = 4 * 1024 * 1024;
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/// How many members one search for a cover will decompress.
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///
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/// Each is bounded by [`MAX_COVER`], but a manifest can list as many
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/// cover-named images as it likes, and reading every one of them is time a
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/// single book is not owed. A real cover is found in one or two reads.
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const MAX_READS: usize = 8;
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/// Read what an EPUB says about itself.
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pub fn read(path: &str, bytes: &[u8]) -> Metadata {
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let mut meta = Metadata::empty(path, Source::Opf);
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@@ -302,8 +295,6 @@ fn cover<R: std::io::Read + std::io::Seek>(
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archive,
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items: &items,
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tried: Vec::new(),
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reads: 0,
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spent: false,
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meta,
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};
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@@ -353,21 +344,12 @@ fn cover<R: std::io::Read + std::io::Seek>(
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}
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}
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// Last: an image whose id or file name has the word cover in it, one
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// named `cover` outright first, then in manifest order.
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let file_stem = |item: &Item| stem(item.path.as_deref().unwrap_or(&item.href)).to_string();
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let mut named: Vec<&Item> = items
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.iter()
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.filter(|item| {
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item.media_type.starts_with("image/")
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&& (says_cover(&item.id) || says_cover(&file_stem(item)))
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})
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.collect();
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named.sort_by_key(|item| !file_stem(item).eq_ignore_ascii_case("cover"));
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for item in named {
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if look.spent {
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break;
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}
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// Last: an image whose id or address says cover.
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for item in items.iter().filter(|item| {
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item.media_type.starts_with("image/")
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&& (item.id.to_lowercase().contains("cover")
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|| item.href.to_lowercase().contains("cover"))
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}) {
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if let Some(mut found) = look.image(base, &item.href) {
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found.guessed = true;
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return Some(found);
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@@ -382,19 +364,12 @@ struct Look<'a, R> {
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archive: &'a mut zip::ZipArchive<R>,
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items: &'a [Item],
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tried: Vec<String>,
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/// How many members have been decompressed, against [`MAX_READS`].
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reads: usize,
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/// Whether the reads have run out, and said so.
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spent: bool,
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meta: &'a mut Metadata,
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}
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impl<R: std::io::Read + std::io::Seek> Look<'_, R> {
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/// Where an address leads, or a note saying it leads nowhere it may.
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fn locate(&mut self, base: &str, href: &str) -> Option<String> {
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if self.spent {
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return None;
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}
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let Some(path) = resolve(base, href) else {
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self.meta.note(format!(
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"the cover's address, {href}, is not a path inside the archive"
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@@ -417,11 +392,6 @@ impl<R: std::io::Read + std::io::Seek> Look<'_, R> {
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/// The image a cover page shows, or the page itself where the guide
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/// points straight at an image.
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///
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/// A page with several images may lead with a logo or an ornament, so
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/// the one whose file name, `alt`, `id` or `class` says cover is taken
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/// over the first; with none of them saying so, the first is taken, and
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/// a note says the page had others.
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fn page(&mut self, base: &str, href: &str) -> Option<Cover> {
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let path = self.locate(base, href)?;
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let bytes = self.fetch(&path, MAX_PACKAGE as usize, "cover page")?;
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@@ -429,55 +399,23 @@ impl<R: std::io::Read + std::io::Seek> Look<'_, R> {
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return self.check(&path, bytes);
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}
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let text = String::from_utf8_lossy(&bytes);
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let images: Vec<(String, bool)> = tags(&text)
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.filter_map(|(name, tag)| {
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let src = match name {
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"img" => attr(tag, "src"),
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"image" => attr(tag, "xlink:href").or_else(|| attr(tag, "href")),
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_ => None,
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}?;
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let named = says_cover(stem(src.split('#').next().unwrap_or("")))
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|| ["alt", "id", "class"]
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.iter()
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.any(|name| attr(tag, name).is_some_and(|value| says_cover(&value)));
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Some((src, named))
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})
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.collect();
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let src = if let Some((src, _)) = images.iter().find(|(_, named)| *named) {
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src
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} else if let Some((first, _)) = images.first() {
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if images.len() > 1 {
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self.meta.note(format!(
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"the cover page, {path}, shows {} images, and the first was taken",
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images.len()
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));
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}
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first
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} else {
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let Some(src) = tags(&text).find_map(|(name, tag)| match name {
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"img" => attr(tag, "src"),
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"image" => attr(tag, "xlink:href").or_else(|| attr(tag, "href")),
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_ => None,
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}) else {
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self.meta
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.note(format!("the cover page, {path}, shows no image"));
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return None;
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};
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self.image(directory_of(&path), src)
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self.image(directory_of(&path), &src)
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}
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/// One member's bytes, read no further than `cap`.
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///
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/// The size the archive declares is checked first and the read is
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/// bounded anyway, because the declaration may be a lie. No more than
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/// [`MAX_READS`] members are read in all; the first asked for after
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/// that ends the search, with a note.
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/// bounded anyway, because the declaration may be a lie.
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fn fetch(&mut self, path: &str, cap: usize, what: &str) -> Option<Vec<u8>> {
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if self.spent {
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return None;
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}
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if self.reads == MAX_READS {
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self.spent = true;
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self.meta.note(format!(
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"the search for a cover stopped after reading {MAX_READS} members"
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));
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return None;
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}
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let file = match self.archive.by_name(path) {
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Ok(file) => file,
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Err(zip::result::ZipError::FileNotFound) => {
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@@ -496,7 +434,6 @@ impl<R: std::io::Read + std::io::Seek> Look<'_, R> {
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self.meta.note(too_large);
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return None;
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}
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self.reads += 1;
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let mut bytes = Vec::new();
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if file.take(cap as u64 + 1).read_to_end(&mut bytes).is_err() {
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self.meta
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@@ -543,50 +480,6 @@ fn directory_of(path: &str) -> &str {
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path.rsplit_once('/').map_or("", |(dir, _)| dir)
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}
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/// A path's file name without its extension.
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fn stem(path: &str) -> &str {
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let name = path.rsplit_once('/').map_or(path, |(_, name)| name);
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match name.rsplit_once('.') {
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Some((stem, _)) if !stem.is_empty() => stem,
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_ => name,
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}
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}
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/// Whether a name has `cover` in it as a word of its own, in any case.
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///
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/// Words are split at anything not a letter or a digit and where a lower
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/// case letter meets a capital, so `CoverImage`, `Book_COVER` and
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/// `cover-thumb` say cover, and `discover` and `recovery` do not.
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fn says_cover(name: &str) -> bool {
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words(name)
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.iter()
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.any(|word| word.eq_ignore_ascii_case("cover"))
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}
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/// The words of a name, as [`says_cover`] splits them.
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fn words(name: &str) -> Vec<&str> {
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let mut out = Vec::new();
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let mut start: Option<usize> = None;
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let mut prev = ' ';
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for (at, c) in name.char_indices() {
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let begins =
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c.is_alphanumeric() && (start.is_none() || (prev.is_lowercase() && c.is_uppercase()));
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if !c.is_alphanumeric() || begins {
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if let Some(from) = start.take() {
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out.push(&name[from..at]);
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}
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}
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if begins {
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start = Some(at);
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}
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prev = c;
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}
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if let Some(from) = start {
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out.push(&name[from..]);
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}
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out
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}
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/// Where an address written in a member in `base` leads inside the archive.
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///
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/// The fragment comes off and percent-escapes are undone. An address with a
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@@ -630,13 +523,7 @@ fn percent_decode(text: &str) -> Option<String> {
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let mut at = 0;
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while at < raw.len() {
|
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if raw[at] == b'%' {
|
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// Two hex digits and nothing else: `from_str_radix` would also
|
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// take a sign, and read `%+f` as 15.
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let hex = raw.get(at + 1..at + 3)?;
|
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if !hex.iter().all(u8::is_ascii_hexdigit) {
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return None;
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}
|
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let hex = std::str::from_utf8(hex).ok()?;
|
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let hex = std::str::from_utf8(raw.get(at + 1..at + 3)?).ok()?;
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out.push(u8::from_str_radix(hex, 16).ok()?);
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at += 3;
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} else {
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@@ -991,147 +878,6 @@ mod tests {
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assert_eq!(meta.cover.expect("a cover").bytes, JPEG);
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}
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#[test]
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fn a_name_says_cover_only_as_a_word_of_its_own() {
|
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for yes in [
|
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"cover",
|
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"CoverImage",
|
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"Book_COVER",
|
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"cover-thumb",
|
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"frontCover",
|
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"x.cover",
|
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] {
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assert!(says_cover(yes), "{yes}");
|
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}
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for no in [
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"discover-ch1",
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"recovery-map",
|
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"covers",
|
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"Coverage",
|
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"uncover",
|
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"",
|
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] {
|
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assert!(!says_cover(no), "{no}");
|
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}
|
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assert_eq!(words("CoverImage_v2"), ["Cover", "Image", "v2"]);
|
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}
|
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|
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#[test]
|
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fn a_name_that_only_contains_cover_is_not_a_cover() {
|
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let package = opf(
|
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r#"<item id="ch1" href="images/discover-ch1.png" media-type="image/png"/>
|
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<item id="i2" href="images/cover.jpg" media-type="image/jpeg"/>"#,
|
||||
"",
|
||||
);
|
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let meta = book(
|
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&package,
|
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&[
|
||||
("OEBPS/images/discover-ch1.png", PNG),
|
||||
("OEBPS/images/cover.jpg", JPEG),
|
||||
],
|
||||
);
|
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let cover = meta.cover.expect("a cover");
|
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assert_eq!(cover.bytes, JPEG);
|
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assert!(cover.guessed);
|
||||
|
||||
let alone = opf(
|
||||
r#"<item id="map" href="images/recovery-map.png" media-type="image/png"/>"#,
|
||||
"",
|
||||
);
|
||||
let meta = book(&alone, &[("OEBPS/images/recovery-map.png", PNG)]);
|
||||
assert_eq!(meta.cover, None);
|
||||
assert!(meta.notes.is_empty(), "{:?}", meta.notes);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn an_image_named_cover_outright_beats_one_listed_before_it() {
|
||||
let package = opf(
|
||||
r#"<item id="cover-thumb" href="images/thumb.png" media-type="image/png"/>
|
||||
<item id="i2" href="images/Cover.jpg" media-type="image/jpeg"/>"#,
|
||||
"",
|
||||
);
|
||||
let meta = book(
|
||||
&package,
|
||||
&[
|
||||
("OEBPS/images/thumb.png", PNG),
|
||||
("OEBPS/images/Cover.jpg", JPEG),
|
||||
],
|
||||
);
|
||||
let cover = meta.cover.expect("a cover");
|
||||
assert_eq!(cover.bytes, JPEG);
|
||||
assert!(cover.guessed);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn the_guide_cover_page_prefers_the_image_that_says_cover() {
|
||||
let package = opf(
|
||||
"",
|
||||
r#"<guide><reference type="cover" href="text/cover.xhtml"/></guide>"#,
|
||||
);
|
||||
for art in [
|
||||
r#"<img src="../images/front-cover.jpg"/>"#,
|
||||
r#"<img alt="Cover" src="../images/front-cover.jpg"/>"#,
|
||||
r#"<img id="coverImage" src="../images/front-cover.jpg"/>"#,
|
||||
r#"<img class="full cover" src="../images/front-cover.jpg"/>"#,
|
||||
] {
|
||||
let page = format!(r#"<html><body><img src="../images/logo.png"/>{art}</body></html>"#);
|
||||
let meta = book(
|
||||
&package,
|
||||
&[
|
||||
("OEBPS/text/cover.xhtml", page.as_bytes()),
|
||||
("OEBPS/images/logo.png", PNG),
|
||||
("OEBPS/images/front-cover.jpg", JPEG),
|
||||
],
|
||||
);
|
||||
assert_eq!(meta.cover.expect(art).bytes, JPEG, "{art}");
|
||||
assert!(meta.notes.is_empty(), "{art}: {:?}", meta.notes);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_guide_cover_page_with_several_unnamed_images_takes_the_first_and_says_so() {
|
||||
let package = opf(
|
||||
"",
|
||||
r#"<guide><reference type="cover" href="text/cover.xhtml"/></guide>"#,
|
||||
);
|
||||
let page = br#"<html><body><img src="../images/logo.png"/><img src="../images/art.jpg"/></body></html>"#;
|
||||
let meta = book(
|
||||
&package,
|
||||
&[
|
||||
("OEBPS/text/cover.xhtml", page),
|
||||
("OEBPS/images/logo.png", PNG),
|
||||
("OEBPS/images/art.jpg", JPEG),
|
||||
],
|
||||
);
|
||||
assert_eq!(meta.cover.expect("a cover").bytes, PNG);
|
||||
assert_eq!(
|
||||
meta.notes,
|
||||
["the cover page, OEBPS/text/cover.xhtml, shows 2 images, and the first was taken"]
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_search_for_a_cover_reads_no_more_than_its_budget() {
|
||||
let count = MAX_READS + 4;
|
||||
let manifest: String = (0..count)
|
||||
.map(|n| format!(r#"<item id="cover-{n}" href="c{n}.jpg" media-type="image/jpeg"/>"#))
|
||||
.collect();
|
||||
let names: Vec<String> = (0..count).map(|n| format!("OEBPS/c{n}.jpg")).collect();
|
||||
let members: Vec<(&str, &[u8])> = names
|
||||
.iter()
|
||||
.map(|name| (name.as_str(), &b"<html>not an image</html>"[..]))
|
||||
.collect();
|
||||
let meta = book(&opf(&manifest, ""), &members);
|
||||
assert_eq!(meta.cover, None);
|
||||
let mut expected: Vec<String> = (0..MAX_READS)
|
||||
.map(|n| format!("the cover, OEBPS/c{n}.jpg, is not an image"))
|
||||
.collect();
|
||||
expected.push(format!(
|
||||
"the search for a cover stopped after reading {MAX_READS} members"
|
||||
));
|
||||
assert_eq!(meta.notes, expected);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_book_that_names_no_cover_has_none_and_says_nothing() {
|
||||
let package = opf(
|
||||
@@ -1192,8 +938,6 @@ mod tests {
|
||||
archive: &mut archive,
|
||||
items: &[],
|
||||
tried: Vec::new(),
|
||||
reads: 0,
|
||||
spent: false,
|
||||
meta: &mut meta,
|
||||
};
|
||||
let got = look.fetch("big.jpg", cap, "cover").map(|bytes| bytes.len());
|
||||
@@ -1286,8 +1030,6 @@ mod tests {
|
||||
Some("OEBPS/text/b.jpg")
|
||||
);
|
||||
assert_eq!(resolve("", "a%2Fb.jpg").as_deref(), Some("a/b.jpg"));
|
||||
assert_eq!(percent_decode("a%2fb%2F").as_deref(), Some("a/b/"));
|
||||
assert_eq!(percent_decode("a%+fb"), None);
|
||||
for hostile in [
|
||||
"../../c.jpg",
|
||||
"../../../etc/passwd",
|
||||
@@ -1296,9 +1038,6 @@ mod tests {
|
||||
"file:///etc/passwd",
|
||||
"%ZZ.jpg",
|
||||
"%ff.jpg",
|
||||
"a%+fb",
|
||||
"a%-1b",
|
||||
"a% fb",
|
||||
"c%",
|
||||
"#only-a-fragment",
|
||||
"",
|
||||
|
||||
@@ -89,12 +89,12 @@ one bad file does not stop a sweep.
|
||||
| `ole2` | The compound-file header every binary Word document starts with |
|
||||
| `epub` | A zip holding `mimetype` and `META-INF/container.xml` |
|
||||
| `zip-wrapped-pdf` | A zip whose only real member is one PDF |
|
||||
| `zip-wrapped-fb2` | A zip whose only real member is one FictionBook — the `.fb2.zip` most of them are passed around as |
|
||||
| `cbz` | A zip whose every real member is a page image: JPEG, PNG, GIF or WebP |
|
||||
| `zip-wrapped-fb2` | A zip whose only real member is named `.fb2` — the `.fb2.zip` most FictionBooks are passed around as |
|
||||
| `cbz` | A zip whose every real member is a page image (JPEG, PNG, GIF or WebP), and which carries a `ComicInfo.xml` or is itself named `.cbz` or `.cbr` |
|
||||
| `azw3`, `mobi` | A Palm database tagged `BOOKMOBI`, told apart by the format version inside the first record |
|
||||
| `lit` | `ITOLITLS`, Microsoft Reader's signature |
|
||||
| `rtf` | `{\rtf` at the front, after any byte-order mark and blank space |
|
||||
| `fb2` | XML whose root element is `FictionBook`, found by stepping over the declaration, comments and doctype in the first four kilobytes |
|
||||
| `rtf` | `{\rtf` at the front, after any byte-order mark and blank space, followed by the version digit, a space or the next control word |
|
||||
| `fb2` | XML whose root element is `FictionBook`, found by stepping over the declaration, comments and doctype in the first four kilobytes; UTF-16 with a byte-order mark is decoded first |
|
||||
| `html` | Markup at the front, after any byte-order mark |
|
||||
| `txt` | Text that is none of the above |
|
||||
| `unknown` | Anything else, with a note saying what was seen |
|
||||
@@ -110,8 +110,17 @@ kind is there to stop exactly that.
|
||||
A comic is the pages and nothing else. Directories, the `ComicInfo.xml` a
|
||||
comic reader writes into the archive, and the desktop clutter every archive
|
||||
picks up are passed over; anything more — one PDF among the pages, a readme —
|
||||
and the zip is not a comic, and says what it holds instead. Only names are
|
||||
read, out of the archive's directory, so no member is ever unpacked.
|
||||
and the zip is not a comic, and says what it holds instead.
|
||||
|
||||
A zip of pictures is as often a holiday as a comic, so images alone are not
|
||||
enough. It is a comic when it carries a `ComicInfo.xml`, or when its own name
|
||||
ends `.cbz` or `.cbr`. Otherwise it is `unknown`, with a note saying it is a
|
||||
zip of so many images and would be a comic book if its name said `.cbz`.
|
||||
|
||||
Members are judged by name. Only the archive's directory is read, so no
|
||||
member is ever unpacked and a page called `001.jpg` is taken to be an image
|
||||
without its bytes being looked at. The same goes for a wrapped FictionBook:
|
||||
the one member is taken to be a FictionBook because its name ends `.fb2`.
|
||||
|
||||
FictionBook is read as bytes rather than as text. A great many are written in
|
||||
windows-1251, which spells its markup in ASCII but is not UTF-8, and would
|
||||
|
||||
@@ -9,9 +9,22 @@
|
||||
//! windows-1251, which is not UTF-8 but spells its markup in ASCII all the
|
||||
//! same, and a reader that insisted on UTF-8 would call every one of them
|
||||
//! binary.
|
||||
//!
|
||||
//! A FictionBook saved as UTF-16 is the one case where the markup is not
|
||||
//! ASCII bytes. Its byte-order mark says so, and the front is decoded before
|
||||
//! the same walk is made over it.
|
||||
|
||||
use crate::BOM;
|
||||
|
||||
/// The UTF-16 byte-order mark, little-endian.
|
||||
const UTF16_LE: &[u8] = b"\xff\xfe";
|
||||
/// The UTF-16 byte-order mark, big-endian.
|
||||
const UTF16_BE: &[u8] = b"\xfe\xff";
|
||||
|
||||
/// Most UTF-16 code units decoded from the front: the same window, in
|
||||
/// characters, as the bytes read for every other encoding.
|
||||
const UTF16_UNITS: usize = 2048;
|
||||
|
||||
/// What the root element of a FictionBook is called.
|
||||
const ROOT: &[u8] = b"FictionBook";
|
||||
|
||||
@@ -21,9 +34,41 @@ const ROOT: &[u8] = b"FictionBook";
|
||||
/// does not begin inside it is not found, so the answer is no rather than a
|
||||
/// guess.
|
||||
pub fn is_fictionbook(head: &[u8]) -> bool {
|
||||
match utf16(head) {
|
||||
Some(decoded) => is_fictionbook_root(decoded.as_bytes()),
|
||||
None => is_fictionbook_root(head),
|
||||
}
|
||||
}
|
||||
|
||||
fn is_fictionbook_root(head: &[u8]) -> bool {
|
||||
root_element(head).is_some_and(|name| local_name(name) == ROOT)
|
||||
}
|
||||
|
||||
/// The front of a UTF-16 file as UTF-8, if a byte-order mark says it is one.
|
||||
///
|
||||
/// Only a bounded prefix is decoded. A half character at the end, or a
|
||||
/// surrogate without its pair, becomes a replacement character, which the
|
||||
/// walk takes as part of a name and so never as the end of one.
|
||||
fn utf16(head: &[u8]) -> Option<String> {
|
||||
let (body, big_endian) = match head.strip_prefix(UTF16_LE) {
|
||||
Some(body) => (body, false),
|
||||
None => (head.strip_prefix(UTF16_BE)?, true),
|
||||
};
|
||||
let units = body.chunks_exact(2).take(UTF16_UNITS).map(|pair| {
|
||||
let pair = [pair[0], pair[1]];
|
||||
if big_endian {
|
||||
u16::from_be_bytes(pair)
|
||||
} else {
|
||||
u16::from_le_bytes(pair)
|
||||
}
|
||||
});
|
||||
Some(
|
||||
char::decode_utf16(units)
|
||||
.map(|c| c.unwrap_or(char::REPLACEMENT_CHARACTER))
|
||||
.collect(),
|
||||
)
|
||||
}
|
||||
|
||||
/// The name of the first element, after the prolog.
|
||||
fn root_element(head: &[u8]) -> Option<&[u8]> {
|
||||
let mut rest = head.strip_prefix(BOM).unwrap_or(head);
|
||||
@@ -146,6 +191,60 @@ mod tests {
|
||||
assert!(!is_fictionbook(b"<!-- never closed <FictionBook>"));
|
||||
}
|
||||
|
||||
fn utf16(text: &str, big_endian: bool) -> Vec<u8> {
|
||||
let mut out = if big_endian {
|
||||
UTF16_BE.to_vec()
|
||||
} else {
|
||||
UTF16_LE.to_vec()
|
||||
};
|
||||
for unit in text.encode_utf16() {
|
||||
out.extend_from_slice(&if big_endian {
|
||||
unit.to_be_bytes()
|
||||
} else {
|
||||
unit.to_le_bytes()
|
||||
});
|
||||
}
|
||||
out
|
||||
}
|
||||
|
||||
const UTF16_BOOK: &str = "<?xml version=\"1.0\" encoding=\"UTF-16\"?>\r\n\
|
||||
<FictionBook xmlns=\"http://www.gribuser.ru/xml/fictionbook/2.0\">\
|
||||
<description><book-title>Мельница</book-title>";
|
||||
|
||||
#[test]
|
||||
fn a_little_endian_utf16_fictionbook_is_recognised() {
|
||||
assert!(is_fictionbook(&utf16(UTF16_BOOK, false)));
|
||||
assert!(!is_fictionbook(&utf16(
|
||||
"<?xml version=\"1.0\"?><rss>",
|
||||
false
|
||||
)));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_big_endian_utf16_fictionbook_is_recognised() {
|
||||
assert!(is_fictionbook(&utf16(UTF16_BOOK, true)));
|
||||
assert!(!is_fictionbook(&utf16(
|
||||
"<?xml version=\"1.0\"?><rss>",
|
||||
true
|
||||
)));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn utf16_read_in_the_wrong_order_is_not_a_fictionbook() {
|
||||
let mut swapped = utf16(UTF16_BOOK, false);
|
||||
swapped[..2].copy_from_slice(UTF16_BE);
|
||||
assert!(!is_fictionbook(&swapped));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_utf16_root_the_window_cut_short_is_not_taken() {
|
||||
let head = utf16("<FictionBook>", false);
|
||||
for cut in 0..head.len() {
|
||||
assert!(!is_fictionbook(&head[..cut]), "cut at {cut}");
|
||||
}
|
||||
assert!(is_fictionbook(&head));
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_truncated_or_mangled_prolog_does_not_panic() {
|
||||
let head = b"\xef\xbb\xbf<?xml?><!--c--><!DOCTYPE x [ <!ENTITY a '>'> ] \"]\">\
|
||||
|
||||
+137
-13
@@ -36,7 +36,10 @@ const ARCHIVE_NOISE: &[&str] = &["__macosx/", ".ds_store", "thumbs.db"];
|
||||
|
||||
/// What a comic book archive carries besides its pages: the catalogue entry
|
||||
/// comic readers write into it.
|
||||
const COMIC_NOISE: &[&str] = &["comicinfo.xml"];
|
||||
const COMIC_CATALOGUE: &str = "comicinfo.xml";
|
||||
|
||||
/// The extensions that say an archive is a comic book.
|
||||
const COMIC_EXTENSIONS: &[&str] = &["cbz", "cbr"];
|
||||
|
||||
/// The extensions of the images a comic book archive is made of.
|
||||
const PAGE_IMAGES: &[&str] = &[".jpg", ".jpeg", ".png", ".gif", ".webp"];
|
||||
@@ -125,8 +128,23 @@ fn archive(source: &impl Bytes, doc: &mut Doc) -> Kind {
|
||||
doc.note(format!("a zip holding one FictionBook, {fb2:?}"));
|
||||
return Kind::ZipWrappedFb2;
|
||||
}
|
||||
if is_comic(&names) {
|
||||
return Kind::Cbz;
|
||||
if let Some(pages) = comic_pages(&names) {
|
||||
// A zip of pictures is as often a holiday as a comic, and only the
|
||||
// names have been read. It is a comic when something says so: the
|
||||
// catalogue entry a comic reader writes, or a name that claims it.
|
||||
let named_comic = doc
|
||||
.declared_ext
|
||||
.as_deref()
|
||||
.is_some_and(|ext| COMIC_EXTENSIONS.contains(&ext));
|
||||
if pages.catalogued || named_comic {
|
||||
return Kind::Cbz;
|
||||
}
|
||||
doc.note(format!(
|
||||
"a zip of {} image{}, which would be a comic book if its name said .cbz",
|
||||
pages.count,
|
||||
if pages.count == 1 { "" } else { "s" }
|
||||
));
|
||||
return Kind::Unknown;
|
||||
}
|
||||
if lower
|
||||
.iter()
|
||||
@@ -160,23 +178,39 @@ fn sole_member<'a>(names: &'a [String], extension: &str) -> Option<&'a str> {
|
||||
}
|
||||
}
|
||||
|
||||
/// Whether an archive is the pages of a comic and nothing else.
|
||||
/// The pages of an archive that is images and nothing else.
|
||||
struct Pages {
|
||||
/// How many images there are.
|
||||
count: usize,
|
||||
/// Whether a comic reader's catalogue entry is there beside them.
|
||||
catalogued: bool,
|
||||
}
|
||||
|
||||
/// The pages, if an archive is images and nothing else.
|
||||
///
|
||||
/// Every real member has to be an image. One PDF or one text file among the
|
||||
/// pages makes it something else, and saying what would be a guess.
|
||||
fn is_comic(names: &[String]) -> bool {
|
||||
/// pages makes it something else, and saying what would be a guess. Images
|
||||
/// are known by their names alone: only the archive's directory is read.
|
||||
fn comic_pages(names: &[String]) -> Option<Pages> {
|
||||
let mut catalogued = false;
|
||||
let pages: Vec<String> = real_members(names)
|
||||
.into_iter()
|
||||
.map(|name| name.to_lowercase())
|
||||
.filter(|name| {
|
||||
let file = name.rsplit('/').next().unwrap_or(name);
|
||||
!COMIC_NOISE.contains(&file)
|
||||
let catalogue = file == COMIC_CATALOGUE;
|
||||
catalogued |= catalogue;
|
||||
!catalogue
|
||||
})
|
||||
.collect();
|
||||
!pages.is_empty()
|
||||
let all_images = !pages.is_empty()
|
||||
&& pages
|
||||
.iter()
|
||||
.all(|name| PAGE_IMAGES.iter().any(|image| name.ends_with(image)))
|
||||
.all(|name| PAGE_IMAGES.iter().any(|image| name.ends_with(image)));
|
||||
all_images.then_some(Pages {
|
||||
count: pages.len(),
|
||||
catalogued,
|
||||
})
|
||||
}
|
||||
|
||||
/// The members that carry content: no directories, no desktop clutter.
|
||||
@@ -198,7 +232,7 @@ fn front(head: &[u8], doc: &mut Doc) -> Kind {
|
||||
// design but not always in practice, and a FictionBook is as often
|
||||
// windows-1251 as UTF-8.
|
||||
let lead = head.strip_prefix(BOM).unwrap_or(head).trim_ascii_start();
|
||||
if lead.starts_with(RTF) {
|
||||
if is_rtf(lead) {
|
||||
return Kind::Rtf;
|
||||
}
|
||||
if fb2::is_fictionbook(head) {
|
||||
@@ -207,6 +241,17 @@ fn front(head: &[u8], doc: &mut Doc) -> Kind {
|
||||
text(head, doc)
|
||||
}
|
||||
|
||||
/// Whether `lead` opens an RTF document.
|
||||
///
|
||||
/// `{\rtf` has to be the whole control word: what follows it is the version,
|
||||
/// normally `1`, or the space or next control word that ends it. `{\rtfoo` is
|
||||
/// some other word that happens to start the same way.
|
||||
fn is_rtf(lead: &[u8]) -> bool {
|
||||
lead.strip_prefix(RTF)
|
||||
.and_then(|rest| rest.first())
|
||||
.is_some_and(|next| next.is_ascii_digit() || next.is_ascii_whitespace() || *next == b'\\')
|
||||
}
|
||||
|
||||
/// Text, markup, or nothing this knows.
|
||||
fn text(head: &[u8], doc: &mut Doc) -> Kind {
|
||||
if head.is_empty() {
|
||||
@@ -432,10 +477,23 @@ mod tests {
|
||||
#[test]
|
||||
fn rtf_cut_short_of_its_control_word_is_not_rtf() {
|
||||
assert_eq!(sniff(&br"{\rt".as_slice(), "a.rtf").kind, Kind::Txt);
|
||||
assert_eq!(sniff(&br"{\rtf".as_slice(), "a.rtf").kind, Kind::Txt);
|
||||
assert_eq!(kind_of(br"{\rtx1", "a.rtf"), Kind::Txt);
|
||||
assert_eq!(kind_of(br"text {\rtf1", "a.rtf"), Kind::Txt);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn rtf_is_the_whole_control_word() {
|
||||
assert_eq!(kind_of(br"{\rtf\ansi\deff0", "a.rtf"), Kind::Rtf);
|
||||
assert_eq!(kind_of(b"{\\rtf \\ansi", "a.rtf"), Kind::Rtf);
|
||||
assert_eq!(kind_of(b"{\\rtf\r\n\\ansi", "a.rtf"), Kind::Rtf);
|
||||
assert_eq!(kind_of(br"{\rtf2", "a.rtf"), Kind::Rtf);
|
||||
|
||||
assert_eq!(kind_of(br"{\rtfoo bar}", "a.rtf"), Kind::Txt);
|
||||
assert_eq!(kind_of(br"{\rtf}", "a.rtf"), Kind::Txt);
|
||||
assert_eq!(kind_of(br"{\rtf-1", "a.rtf"), Kind::Txt);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn rtf_named_as_a_word_document_is_remarked_on() {
|
||||
let doc = sniff(&padded(br"{\rtf1\ansi").as_slice(), "letter.doc");
|
||||
@@ -471,6 +529,28 @@ mod tests {
|
||||
assert_eq!(kind_of(feed, "feed.xml"), Kind::Html);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_utf16_fictionbook_is_recognised_in_either_byte_order() {
|
||||
let book = "<?xml version=\"1.0\" encoding=\"UTF-16\"?>\n<FictionBook>";
|
||||
for big_endian in [false, true] {
|
||||
let mut bytes = if big_endian {
|
||||
vec![0xfe, 0xff]
|
||||
} else {
|
||||
vec![0xff, 0xfe]
|
||||
};
|
||||
for unit in book.encode_utf16() {
|
||||
bytes.extend_from_slice(&if big_endian {
|
||||
unit.to_be_bytes()
|
||||
} else {
|
||||
unit.to_le_bytes()
|
||||
});
|
||||
}
|
||||
let doc = sniff(&padded(&bytes).as_slice(), "mill.fb2");
|
||||
assert_eq!(doc.kind, Kind::Fb2, "big-endian: {big_endian}");
|
||||
assert!(doc.notes.is_empty(), "{:?}", doc.notes);
|
||||
}
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_fictionbook_named_as_something_else_is_remarked_on() {
|
||||
let doc = sniff(&padded(b"<FictionBook>").as_slice(), "mill.txt");
|
||||
@@ -526,11 +606,55 @@ mod tests {
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_comic_saved_as_a_zip_is_remarked_on() {
|
||||
let doc = archive_of(&["001.jpg", "002.jpg"], "issue-1.zip");
|
||||
fn a_zip_of_photographs_is_not_a_comic() {
|
||||
let doc = archive_of(&["IMG_0001.jpg", "IMG_0002.jpg"], "holiday.zip");
|
||||
assert_eq!(doc.kind, Kind::Unknown);
|
||||
assert!(
|
||||
doc.notes.iter().any(|note| note
|
||||
== "a zip of 2 images, which would be a comic book if its name said .cbz"),
|
||||
"{:?}",
|
||||
doc.notes
|
||||
);
|
||||
|
||||
let one = archive_of(&["IMG_0001.jpg"], "holiday.zip");
|
||||
assert!(
|
||||
one.notes
|
||||
.iter()
|
||||
.any(|note| note.starts_with("a zip of 1 image,")),
|
||||
"{:?}",
|
||||
one.notes
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn the_same_images_named_as_a_comic_are_one() {
|
||||
let doc = archive_of(&["IMG_0001.jpg", "IMG_0002.jpg"], "holiday.cbz");
|
||||
assert_eq!(doc.kind, Kind::Cbz);
|
||||
assert!(
|
||||
doc.notes.iter().any(|note| note.contains("comic")),
|
||||
!doc.notes.iter().any(|note| note.contains("named .")),
|
||||
"{:?}",
|
||||
doc.notes
|
||||
);
|
||||
|
||||
// A comic zipped and named as if it were RAR is still a comic, and
|
||||
// the name is remarked on.
|
||||
let rar = archive_of(&["001.jpg", "002.jpg"], "issue-1.cbr");
|
||||
assert_eq!(rar.kind, Kind::Cbz);
|
||||
assert!(
|
||||
rar.notes.iter().any(|note| note.contains("named .cbr")),
|
||||
"{:?}",
|
||||
rar.notes
|
||||
);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn a_comic_saved_as_a_zip_is_known_by_its_catalogue_and_remarked_on() {
|
||||
let doc = archive_of(&["001.jpg", "002.jpg", "ComicInfo.xml"], "issue-1.zip");
|
||||
assert_eq!(doc.kind, Kind::Cbz);
|
||||
assert!(
|
||||
doc.notes
|
||||
.iter()
|
||||
.any(|note| note == "named .zip, but the bytes say a comic book archive"),
|
||||
"{:?}",
|
||||
doc.notes
|
||||
);
|
||||
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Reference in new issue
Block a user