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LibPDF/JBIG2: Print a warning on files with more than one page

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This commit is contained in:
Nico Weber 2024-03-07 20:31:42 -05:00 committed by Tim Flynn
parent 2caf603836
commit f592a2ac72
1 changed files with 34 additions and 0 deletions
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34
Userland/Libraries/LibGfx/ImageFormats/JBIG2Loader.cpp
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@ -303,6 +303,38 @@ static ErrorOr<void> scan_for_page_size(JBIG2LoadingContext& context)
return Error::from_string_literal("JBIG2ImageDecoderPlugin: No page information segment found for page 1");
}
static ErrorOr<void> warn_about_multiple_pages(JBIG2LoadingContext& context)
{
HashTable<u32> seen_pages;
Vector<u32> pages;
for (auto const& segment : context.segments) {
if (segment.header.page_association == 0)
continue;
if (seen_pages.contains(segment.header.page_association))
continue;
seen_pages.set(segment.header.page_association);
pages.append(segment.header.page_association);
}
// scan_for_page_size() already checked that there's a page 1.
VERIFY(seen_pages.contains(1));
if (pages.size() == 1)
return {};
StringBuilder builder;
builder.appendff("JBIG2 file contains {} pages ({}", pages.size(), pages[0]);
size_t i;
for (i = 1; i < min(pages.size(), 10); ++i)
builder.appendff(" {}", pages[i]);
if (i != pages.size())
builder.append(" ..."sv);
builder.append("). We will only render page 1."sv);
dbgln("JBIG2ImageDecoderPlugin: {}", TRY(builder.to_string()));
return {};
}
static ErrorOr<void> decode_symbol_dictionary(JBIG2LoadingContext&, SegmentData const&)
{
return Error::from_string_literal("JBIG2ImageDecoderPlugin: Cannot decode symbol dictionary yet");
@ -415,6 +447,8 @@ static ErrorOr<void> decode_extension(JBIG2LoadingContext&, SegmentData const&)
static ErrorOr<void> decode_data(JBIG2LoadingContext& context)
{
TRY(warn_about_multiple_pages(context));
for (auto const& segment : context.segments) {
if (segment.header.page_association != 0 && segment.header.page_association != 1)
continue;