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ladybird/Userland/Libraries/LibPDF/DocumentParser.cpp
Julian Offenhäuser f9beff7b5e LibPDF: Initial work on parsing xref streams 
Since PDF version 1.5, a document may omit the xref table in favor of
a new kind of xref stream object. This is used to reference so-called
"compressed" objects that are part of an object stream.

With this patch we are able to parse this new kind of xref object, but
we'll have to implement object streams to use them correctly.
2022-09-17 10:07:14 +01:00

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/*
* Copyright (c) 2021-2022, Matthew Olsson <mattco@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/BitStream.h>
#include <AK/MemoryStream.h>
#include <AK/Tuple.h>
#include <LibPDF/CommonNames.h>
#include <LibPDF/Document.h>
#include <LibPDF/DocumentParser.h>
#include <LibPDF/ObjectDerivatives.h>
namespace PDF {
DocumentParser::DocumentParser(Document* document, ReadonlyBytes bytes)
: Parser(document, bytes)
{
}
PDFErrorOr<void> DocumentParser::initialize()
{
TRY(parse_header());
auto const linearization_result = TRY(initialize_linearization_dict());
if (linearization_result == LinearizationResult::NotLinearized)
return initialize_non_linearized_xref_table();
bool is_linearized = m_linearization_dictionary.has_value();
if (is_linearized) {
// The file may have been linearized at one point, but could have been updated afterwards,
// which means it is no longer a linearized PDF file.
is_linearized = m_linearization_dictionary.value().length_of_file == m_reader.bytes().size();
if (!is_linearized) {
// FIXME: The file shouldn't be treated as linearized, yet the xref tables are still
// split. This might take some tweaking to ensure correct behavior, which can be
// implemented later.
TODO();
}
}
if (is_linearized)
return initialize_linearized_xref_table();
return initialize_non_linearized_xref_table();
}
PDFErrorOr<Value> DocumentParser::parse_object_with_index(u32 index)
{
VERIFY(m_xref_table->has_object(index));
auto byte_offset = m_xref_table->byte_offset_for_object(index);
m_reader.move_to(byte_offset);
auto indirect_value = TRY(parse_indirect_value());
VERIFY(indirect_value->index() == index);
return indirect_value->value();
}
PDFErrorOr<void> DocumentParser::parse_header()
{
// FIXME: Do something with the version?
m_reader.set_reading_forwards();
if (m_reader.remaining() == 0)
return error("Empty PDF document");
m_reader.move_to(0);
if (m_reader.remaining() < 8 || !m_reader.matches("%PDF-"))
return error("Not a PDF document");
m_reader.move_by(5);
char major_ver = m_reader.read();
if (major_ver != '1' && major_ver != '2')
return error(String::formatted("Unknown major version \"{}\"", major_ver));
if (m_reader.read() != '.')
return error("Malformed PDF version");
char minor_ver = m_reader.read();
if (minor_ver < '0' || minor_ver > '7')
return error(String::formatted("Unknown minor version \"{}\"", minor_ver));
m_reader.consume_eol();
// Parse optional high-byte comment, which signifies a binary file
// FIXME: Do something with this?
auto comment = parse_comment();
if (!comment.is_empty()) {
auto binary = comment.length() >= 4;
if (binary) {
for (size_t i = 0; i < comment.length() && binary; i++)
binary = static_cast<u8>(comment[i]) > 128;
}
}
return {};
}
PDFErrorOr<DocumentParser::LinearizationResult> DocumentParser::initialize_linearization_dict()
{
// parse_header() is called immediately before this, so we are at the right location
auto indirect_value = Value(*TRY(parse_indirect_value()));
auto dict_value = TRY(m_document->resolve(indirect_value));
if (!dict_value.has<NonnullRefPtr<Object>>())
return error("Expected linearization object to be a dictionary");
auto dict_object = dict_value.get<NonnullRefPtr<Object>>();
if (!dict_object->is<DictObject>())
return LinearizationResult::NotLinearized;
auto dict = dict_object->cast<DictObject>();
if (!dict->contains(CommonNames::Linearized))
return LinearizationResult::NotLinearized;
if (!dict->contains(CommonNames::L, CommonNames::H, CommonNames::O, CommonNames::E, CommonNames::N, CommonNames::T))
return error("Malformed linearization dictionary");
auto length_of_file = dict->get_value(CommonNames::L);
auto hint_table = dict->get_value(CommonNames::H);
auto first_page_object_number = dict->get_value(CommonNames::O);
auto offset_of_first_page_end = dict->get_value(CommonNames::E);
auto number_of_pages = dict->get_value(CommonNames::N);
auto offset_of_main_xref_table = dict->get_value(CommonNames::T);
auto first_page = dict->get(CommonNames::P).value_or({});
// Validation
if (!length_of_file.has_u32()
|| !hint_table.has<NonnullRefPtr<Object>>()
|| !first_page_object_number.has_u32()
|| !number_of_pages.has_u16()
|| !offset_of_main_xref_table.has_u32()
|| (!first_page.has<Empty>() && !first_page.has_u32())) {
return error("Malformed linearization dictionary parameters");
}
auto hint_table_array = hint_table.get<NonnullRefPtr<Object>>()->cast<ArrayObject>();
auto hint_table_size = hint_table_array->size();
if (hint_table_size != 2 && hint_table_size != 4)
return error("Expected hint table to be of length 2 or 4");
auto primary_hint_stream_offset = hint_table_array->at(0);
auto primary_hint_stream_length = hint_table_array->at(1);
Value overflow_hint_stream_offset;
Value overflow_hint_stream_length;
if (hint_table_size == 4) {
overflow_hint_stream_offset = hint_table_array->at(2);
overflow_hint_stream_length = hint_table_array->at(3);
}
if (!primary_hint_stream_offset.has_u32()
|| !primary_hint_stream_length.has_u32()
|| (!overflow_hint_stream_offset.has<Empty>() && !overflow_hint_stream_offset.has_u32())
|| (!overflow_hint_stream_length.has<Empty>() && !overflow_hint_stream_length.has_u32())) {
return error("Malformed hint stream");
}
m_linearization_dictionary = LinearizationDictionary {
length_of_file.get_u32(),
primary_hint_stream_offset.get_u32(),
primary_hint_stream_length.get_u32(),
overflow_hint_stream_offset.has<Empty>() ? NumericLimits<u32>::max() : overflow_hint_stream_offset.get_u32(),
overflow_hint_stream_length.has<Empty>() ? NumericLimits<u32>::max() : overflow_hint_stream_length.get_u32(),
first_page_object_number.get_u32(),
offset_of_first_page_end.get_u32(),
number_of_pages.get_u16(),
offset_of_main_xref_table.get_u32(),
first_page.has<Empty>() ? NumericLimits<u32>::max() : first_page.get_u32(),
};
return LinearizationResult::Linearized;
}
PDFErrorOr<void> DocumentParser::initialize_linearized_xref_table()
{
// The linearization parameter dictionary has just been parsed, and the xref table
// comes immediately after it. We are in the correct spot.
m_xref_table = TRY(parse_xref_table());
if (!m_trailer)
m_trailer = TRY(parse_file_trailer());
// Also parse the main xref table and merge into the first-page xref table. Note
// that we don't use the main xref table offset from the linearization dict because
// for some reason, it specified the offset of the whitespace after the object
// index start and length? So it's much easier to do it this way.
auto main_xref_table_offset = m_trailer->get_value(CommonNames::Prev).to_int();
m_reader.move_to(main_xref_table_offset);
auto main_xref_table = TRY(parse_xref_table());
TRY(m_xref_table->merge(move(*main_xref_table)));
return {};
}
PDFErrorOr<void> DocumentParser::initialize_hint_tables()
{
auto linearization_dict = m_linearization_dictionary.value();
auto primary_offset = linearization_dict.primary_hint_stream_offset;
auto overflow_offset = linearization_dict.overflow_hint_stream_offset;
auto parse_hint_table = [&](size_t offset) -> RefPtr<StreamObject> {
m_reader.move_to(offset);
auto stream_indirect_value = parse_indirect_value();
if (stream_indirect_value.is_error())
return {};
auto stream_value = stream_indirect_value.value()->value();
if (!stream_value.has<NonnullRefPtr<Object>>())
return {};
auto stream_object = stream_value.get<NonnullRefPtr<Object>>();
if (!stream_object->is<StreamObject>())
return {};
return stream_object->cast<StreamObject>();
};
auto primary_hint_stream = parse_hint_table(primary_offset);
if (!primary_hint_stream)
return error("Invalid primary hint stream");
RefPtr<StreamObject> overflow_hint_stream;
if (overflow_offset != NumericLimits<u32>::max())
overflow_hint_stream = parse_hint_table(overflow_offset);
ByteBuffer possible_merged_stream_buffer;
ReadonlyBytes hint_stream_bytes;
if (overflow_hint_stream) {
auto primary_size = primary_hint_stream->bytes().size();
auto overflow_size = overflow_hint_stream->bytes().size();
auto total_size = primary_size + overflow_size;
auto buffer_result = ByteBuffer::create_uninitialized(total_size);
if (buffer_result.is_error())
return Error { Error::Type::Internal, "Failed to allocate hint stream buffer" };
possible_merged_stream_buffer = buffer_result.release_value();
MUST(possible_merged_stream_buffer.try_append(primary_hint_stream->bytes()));
MUST(possible_merged_stream_buffer.try_append(overflow_hint_stream->bytes()));
hint_stream_bytes = possible_merged_stream_buffer.bytes();
} else {
hint_stream_bytes = primary_hint_stream->bytes();
}
auto hint_table = TRY(parse_page_offset_hint_table(hint_stream_bytes));
auto hint_table_entries = parse_all_page_offset_hint_table_entries(hint_table, hint_stream_bytes);
// FIXME: Do something with the hint tables
return {};
}
PDFErrorOr<void> DocumentParser::initialize_non_linearized_xref_table()
{
m_reader.move_to(m_reader.bytes().size() - 1);
if (!navigate_to_before_eof_marker())
return error("No EOF marker");
if (!navigate_to_after_startxref())
return error("No xref");
m_reader.set_reading_forwards();
auto xref_offset_value = parse_number();
if (xref_offset_value.is_error() || !xref_offset_value.value().has<int>())
return error("Invalid xref offset");
auto xref_offset = xref_offset_value.value().get<int>();
m_reader.move_to(xref_offset);
m_xref_table = TRY(parse_xref_table());
if (!m_trailer)
m_trailer = TRY(parse_file_trailer());
return {};
}
PDFErrorOr<NonnullRefPtr<XRefTable>> DocumentParser::parse_xref_stream()
{
auto first_number = TRY(parse_number());
auto second_number = TRY(parse_number());
if (!m_reader.matches("obj"))
return error("Malformed xref object");
m_reader.move_by(3);
if (m_reader.matches_eol())
m_reader.consume_eol();
auto dict = TRY(parse_dict());
auto type = TRY(dict->get_name(m_document, CommonNames::Type))->name();
if (type != "XRef")
return error("Malformed xref dictionary");
auto field_sizes = TRY(dict->get_array(m_document, "W"));
if (field_sizes->size() != 3)
return error("Malformed xref dictionary");
auto object_count = dict->get_value("Size").get<int>();
Vector<Tuple<int, int>> subsection_indices;
if (dict->contains(CommonNames::Index)) {
auto index_array = TRY(dict->get_array(m_document, CommonNames::Index));
if (index_array->size() % 2 != 0)
return error("Malformed xref dictionary");
for (size_t i = 0; i < index_array->size(); i += 2)
subsection_indices.append({ index_array->at(i).get<int>(), index_array->at(i + 1).get<int>() - 1 });
} else {
subsection_indices.append({ 0, object_count - 1 });
}
auto stream = TRY(parse_stream(dict));
auto table = adopt_ref(*new XRefTable());
auto field_to_long = [](Span<const u8> field) -> long {
long value = 0;
const u8 max = (field.size() - 1) * 8;
for (size_t i = 0; i < field.size(); ++i) {
value |= static_cast<long>(field[i]) << (max - (i * 8));
}
return value;
};
size_t byte_index = 0;
size_t subsection_index = 0;
Vector<XRefEntry> entries;
for (int entry_index = 0; entry_index < object_count; ++entry_index) {
Array<long, 3> fields;
for (size_t field_index = 0; field_index < 3; ++field_index) {
auto field_size = field_sizes->at(field_index).get_u32();
auto field = stream->bytes().slice(byte_index, field_size);
fields[field_index] = field_to_long(field);
byte_index += field_size;
}
u8 type = fields[0];
if (!field_sizes->at(0).get_u32())
type = 1;
entries.append({ fields[1], static_cast<u16>(fields[2]), type != 0, type == 2 });
auto indices = subsection_indices[subsection_index];
if (entry_index >= indices.get<1>()) {
table->add_section({ indices.get<0>(), indices.get<1>(), entries });
entries.clear();
subsection_index++;
}
}
m_trailer = dict;
return table;
}
PDFErrorOr<NonnullRefPtr<XRefTable>> DocumentParser::parse_xref_table()
{
if (!m_reader.matches("xref")) {
// Since version 1.5, there may be a cross-reference stream instead
return parse_xref_stream();
}
m_reader.move_by(4);
if (!m_reader.consume_eol())
return error("Expected newline after \"xref\"");
auto table = adopt_ref(*new XRefTable());
do {
if (m_reader.matches("trailer"))
return table;
Vector<XRefEntry> entries;
auto starting_index_value = TRY(parse_number());
auto starting_index = starting_index_value.get<int>();
auto object_count_value = TRY(parse_number());
auto object_count = object_count_value.get<int>();
for (int i = 0; i < object_count; i++) {
auto offset_string = String(m_reader.bytes().slice(m_reader.offset(), 10));
m_reader.move_by(10);
if (!m_reader.consume(' '))
return error("Malformed xref entry");
auto generation_string = String(m_reader.bytes().slice(m_reader.offset(), 5));
m_reader.move_by(5);
if (!m_reader.consume(' '))
return error("Malformed xref entry");
auto letter = m_reader.read();
if (letter != 'n' && letter != 'f')
return error("Malformed xref entry");
// The line ending sequence can be one of the following:
// SP CR, SP LF, or CR LF
if (m_reader.matches(' ')) {
m_reader.consume();
auto ch = m_reader.consume();
if (ch != '\r' && ch != '\n')
return error("Malformed xref entry");
} else {
if (!m_reader.matches("\r\n"))
return error("Malformed xref entry");
m_reader.move_by(2);
}
auto offset = strtol(offset_string.characters(), nullptr, 10);
auto generation = strtol(generation_string.characters(), nullptr, 10);
entries.append({ offset, static_cast<u16>(generation), letter == 'n' });
}
table->add_section({ starting_index, object_count, entries });
} while (m_reader.matches_number());
return table;
}
PDFErrorOr<NonnullRefPtr<DictObject>> DocumentParser::parse_file_trailer()
{
while (m_reader.matches_eol())
m_reader.consume_eol();
if (!m_reader.matches("trailer"))
return error("Expected \"trailer\" keyword");
m_reader.move_by(7);
m_reader.consume_whitespace();
auto dict = TRY(parse_dict());
if (!m_reader.matches("startxref"))
return error("Expected \"startxref\"");
m_reader.move_by(9);
m_reader.consume_whitespace();
m_reader.move_until([&](auto) { return m_reader.matches_eol(); });
VERIFY(m_reader.consume_eol());
if (!m_reader.matches("%%EOF"))
return error("Expected \"%%EOF\"");
m_reader.move_by(5);
m_reader.consume_whitespace();
return dict;
}
PDFErrorOr<DocumentParser::PageOffsetHintTable> DocumentParser::parse_page_offset_hint_table(ReadonlyBytes hint_stream_bytes)
{
if (hint_stream_bytes.size() < sizeof(PageOffsetHintTable))
return error("Hint stream is too small");
size_t offset = 0;
auto read_u32 = [&] {
u32 data = reinterpret_cast<const u32*>(hint_stream_bytes.data() + offset)[0];
offset += 4;
return AK::convert_between_host_and_big_endian(data);
};
auto read_u16 = [&] {
u16 data = reinterpret_cast<const u16*>(hint_stream_bytes.data() + offset)[0];
offset += 2;
return AK::convert_between_host_and_big_endian(data);
};
PageOffsetHintTable hint_table {
read_u32(),
read_u32(),
read_u16(),
read_u32(),
read_u16(),
read_u32(),
read_u16(),
read_u32(),
read_u16(),
read_u16(),
read_u16(),
read_u16(),
read_u16(),
};
// Verify that all of the bits_required_for_xyz fields are <= 32, since all of the numeric
// fields in PageOffsetHintTableEntry are u32
VERIFY(hint_table.bits_required_for_object_number <= 32);
VERIFY(hint_table.bits_required_for_page_length <= 32);
VERIFY(hint_table.bits_required_for_content_stream_offsets <= 32);
VERIFY(hint_table.bits_required_for_content_stream_length <= 32);
VERIFY(hint_table.bits_required_for_number_of_shared_obj_refs <= 32);
VERIFY(hint_table.bits_required_for_greatest_shared_obj_identifier <= 32);
VERIFY(hint_table.bits_required_for_fraction_numerator <= 32);
return hint_table;
}
Vector<DocumentParser::PageOffsetHintTableEntry> DocumentParser::parse_all_page_offset_hint_table_entries(PageOffsetHintTable const& hint_table, ReadonlyBytes hint_stream_bytes)
{
InputMemoryStream input_stream(hint_stream_bytes);
input_stream.seek(sizeof(PageOffsetHintTable));
InputBitStream bit_stream(input_stream);
auto number_of_pages = m_linearization_dictionary.value().number_of_pages;
Vector<PageOffsetHintTableEntry> entries;
for (size_t i = 0; i < number_of_pages; i++)
entries.append(PageOffsetHintTableEntry {});
auto bits_required_for_object_number = hint_table.bits_required_for_object_number;
auto bits_required_for_page_length = hint_table.bits_required_for_page_length;
auto bits_required_for_content_stream_offsets = hint_table.bits_required_for_content_stream_offsets;
auto bits_required_for_content_stream_length = hint_table.bits_required_for_content_stream_length;
auto bits_required_for_number_of_shared_obj_refs = hint_table.bits_required_for_number_of_shared_obj_refs;
auto bits_required_for_greatest_shared_obj_identifier = hint_table.bits_required_for_greatest_shared_obj_identifier;
auto bits_required_for_fraction_numerator = hint_table.bits_required_for_fraction_numerator;
auto parse_int_entry = [&](u32 PageOffsetHintTableEntry::*field, u32 bit_size) {
if (bit_size <= 0)
return;
for (int i = 0; i < number_of_pages; i++) {
auto& entry = entries[i];
entry.*field = bit_stream.read_bits(bit_size);
}
};
auto parse_vector_entry = [&](Vector<u32> PageOffsetHintTableEntry::*field, u32 bit_size) {
if (bit_size <= 0)
return;
for (int page = 1; page < number_of_pages; page++) {
auto number_of_shared_objects = entries[page].number_of_shared_objects;
Vector<u32> items;
items.ensure_capacity(number_of_shared_objects);
for (size_t i = 0; i < number_of_shared_objects; i++)
items.unchecked_append(bit_stream.read_bits(bit_size));
entries[page].*field = move(items);
}
};
parse_int_entry(&PageOffsetHintTableEntry::objects_in_page_number, bits_required_for_object_number);
parse_int_entry(&PageOffsetHintTableEntry::page_length_number, bits_required_for_page_length);
parse_int_entry(&PageOffsetHintTableEntry::number_of_shared_objects, bits_required_for_number_of_shared_obj_refs);
parse_vector_entry(&PageOffsetHintTableEntry::shared_object_identifiers, bits_required_for_greatest_shared_obj_identifier);
parse_vector_entry(&PageOffsetHintTableEntry::shared_object_location_numerators, bits_required_for_fraction_numerator);
parse_int_entry(&PageOffsetHintTableEntry::page_content_stream_offset_number, bits_required_for_content_stream_offsets);
parse_int_entry(&PageOffsetHintTableEntry::page_content_stream_length_number, bits_required_for_content_stream_length);
return entries;
}
bool DocumentParser::navigate_to_before_eof_marker()
{
m_reader.set_reading_backwards();
while (!m_reader.done()) {
m_reader.move_until([&](auto) { return m_reader.matches_eol(); });
if (m_reader.done())
return false;
m_reader.consume_eol();
if (!m_reader.matches("%%EOF"))
continue;
m_reader.move_by(5);
if (!m_reader.matches_eol())
continue;
m_reader.consume_eol();
return true;
}
return false;
}
bool DocumentParser::navigate_to_after_startxref()
{
m_reader.set_reading_backwards();
while (!m_reader.done()) {
m_reader.move_until([&](auto) { return m_reader.matches_eol(); });
auto offset = m_reader.offset() + 1;
m_reader.consume_eol();
if (!m_reader.matches("startxref"))
continue;
m_reader.move_by(9);
if (!m_reader.matches_eol())
continue;
m_reader.move_to(offset);
return true;
}
return false;
}
PDFErrorOr<RefPtr<DictObject>> DocumentParser::conditionally_parse_page_tree_node(u32 object_index)
{
VERIFY(m_xref_table->has_object(object_index));
auto byte_offset = m_xref_table->byte_offset_for_object(object_index);
m_reader.move_to(byte_offset);
TRY(parse_number());
TRY(parse_number());
if (!m_reader.matches("obj"))
return error(String::formatted("Invalid page tree offset {}", object_index));
m_reader.move_by(3);
m_reader.consume_whitespace();
VERIFY(m_reader.consume('<') && m_reader.consume('<'));
m_reader.consume_whitespace();
HashMap<FlyString, Value> map;
while (true) {
if (m_reader.matches(">>"))
break;
auto name = TRY(parse_name());
auto name_string = name->name();
if (!name_string.is_one_of(CommonNames::Type, CommonNames::Parent, CommonNames::Kids, CommonNames::Count)) {
// This is a page, not a page tree node
return RefPtr<DictObject> {};
}
auto value = TRY(parse_value());
if (name_string == CommonNames::Type) {
if (!value.has<NonnullRefPtr<Object>>())
return RefPtr<DictObject> {};
auto type_object = value.get<NonnullRefPtr<Object>>();
if (!type_object->is<NameObject>())
return RefPtr<DictObject> {};
auto type_name = type_object->cast<NameObject>();
if (type_name->name() != CommonNames::Pages)
return RefPtr<DictObject> {};
}
map.set(name->name(), value);
}
VERIFY(m_reader.consume('>') && m_reader.consume('>'));
m_reader.consume_whitespace();
return make_object<DictObject>(map);
}
}
namespace AK {
template<>
struct Formatter<PDF::DocumentParser::LinearizationDictionary> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& format_builder, PDF::DocumentParser::LinearizationDictionary const& dict)
{
StringBuilder builder;
builder.append("{\n"sv);
builder.appendff(" length_of_file={}\n", dict.length_of_file);
builder.appendff(" primary_hint_stream_offset={}\n", dict.primary_hint_stream_offset);
builder.appendff(" primary_hint_stream_length={}\n", dict.primary_hint_stream_length);
builder.appendff(" overflow_hint_stream_offset={}\n", dict.overflow_hint_stream_offset);
builder.appendff(" overflow_hint_stream_length={}\n", dict.overflow_hint_stream_length);
builder.appendff(" first_page_object_number={}\n", dict.first_page_object_number);
builder.appendff(" offset_of_first_page_end={}\n", dict.offset_of_first_page_end);
builder.appendff(" number_of_pages={}\n", dict.number_of_pages);
builder.appendff(" offset_of_main_xref_table={}\n", dict.offset_of_main_xref_table);
builder.appendff(" first_page={}\n", dict.first_page);
builder.append('}');
return Formatter<StringView>::format(format_builder, builder.to_string());
}
};
template<>
struct Formatter<PDF::DocumentParser::PageOffsetHintTable> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& format_builder, PDF::DocumentParser::PageOffsetHintTable const& table)
{
StringBuilder builder;
builder.append("{\n"sv);
builder.appendff(" least_number_of_objects_in_a_page={}\n", table.least_number_of_objects_in_a_page);
builder.appendff(" location_of_first_page_object={}\n", table.location_of_first_page_object);
builder.appendff(" bits_required_for_object_number={}\n", table.bits_required_for_object_number);
builder.appendff(" least_length_of_a_page={}\n", table.least_length_of_a_page);
builder.appendff(" bits_required_for_page_length={}\n", table.bits_required_for_page_length);
builder.appendff(" least_offset_of_any_content_stream={}\n", table.least_offset_of_any_content_stream);
builder.appendff(" bits_required_for_content_stream_offsets={}\n", table.bits_required_for_content_stream_offsets);
builder.appendff(" least_content_stream_length={}\n", table.least_content_stream_length);
builder.appendff(" bits_required_for_content_stream_length={}\n", table.bits_required_for_content_stream_length);
builder.appendff(" bits_required_for_number_of_shared_obj_refs={}\n", table.bits_required_for_number_of_shared_obj_refs);
builder.appendff(" bits_required_for_greatest_shared_obj_identifier={}\n", table.bits_required_for_greatest_shared_obj_identifier);
builder.appendff(" bits_required_for_fraction_numerator={}\n", table.bits_required_for_fraction_numerator);
builder.appendff(" shared_object_reference_fraction_denominator={}\n", table.shared_object_reference_fraction_denominator);
builder.append('}');
return Formatter<StringView>::format(format_builder, builder.to_string());
}
};
template<>
struct Formatter<PDF::DocumentParser::PageOffsetHintTableEntry> : Formatter<StringView> {
ErrorOr<void> format(FormatBuilder& format_builder, PDF::DocumentParser::PageOffsetHintTableEntry const& entry)
{
StringBuilder builder;
builder.append("{\n"sv);
builder.appendff(" objects_in_page_number={}\n", entry.objects_in_page_number);
builder.appendff(" page_length_number={}\n", entry.page_length_number);
builder.appendff(" number_of_shared_objects={}\n", entry.number_of_shared_objects);
builder.append(" shared_object_identifiers=["sv);
for (auto& identifier : entry.shared_object_identifiers)
builder.appendff(" {}", identifier);
builder.append(" ]\n"sv);
builder.append(" shared_object_location_numerators=["sv);
for (auto& numerator : entry.shared_object_location_numerators)
builder.appendff(" {}", numerator);
builder.append(" ]\n"sv);
builder.appendff(" page_content_stream_offset_number={}\n", entry.page_content_stream_offset_number);
builder.appendff(" page_content_stream_length_number={}\n", entry.page_content_stream_length_number);
builder.append('}');
return Formatter<StringView>::format(format_builder, builder.to_string());
}
};
}
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