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LibPDF: Add support for stream filters

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This commit also splits up StreamObject into PlainTextStreamObject and
EncodedStreamObject, which is essentially just a stream object which
does not own its bytes vs one which does.
This commit is contained in:
Matthew Olsson 2021-05-22 20:44:18 -07:00 • committed by Ali Mohammad Pur
parent 97cc482087
commit 477e3946e5
6 changed files with 253 additions and 7 deletions
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11
Userland/Libraries/LibPDF/Parser.cpp
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@ -7,6 +7,7 @@
#include <AK/ScopeGuard.h>
#include <AK/TypeCasts.h>
#include <LibPDF/Document.h>
#include <LibPDF/Filter.h>
#include <LibPDF/Parser.h>
#include <ctype.h>
#include <math.h>
@ -657,7 +658,15 @@ NonnullRefPtr<StreamObject> Parser::parse_stream(NonnullRefPtr<DictObject> dict)
m_reader.move_by(9);
consume_whitespace();
return make_object<StreamObject>(dict, bytes);
if (dict->contains("Filter")) {
auto filter_type = dict->get_name(m_document, "Filter")->name();
auto maybe_bytes = Filter::decode(bytes, filter_type);
// FIXME: Handle error condition
VERIFY(maybe_bytes.has_value());
return make_object<EncodedStreamObject>(dict, move(maybe_bytes.value()));
}
return make_object<PlainTextStreamObject>(dict, bytes);
}
Vector<Command> Parser::parse_graphics_commands()