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- /*
- * Copyright (c) 2022, Matthew Olsson <mattco@serenityos.org>
- * Copyright (c) 2022, Julian Offenhäuser <offenhaeuser@protonmail.com>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <AK/Utf8View.h>
- #include <LibPDF/CommonNames.h>
- #include <LibPDF/Encoding.h>
- namespace PDF {
- NonnullRefPtr<Encoding> Encoding::create()
- {
- return adopt_ref(*new Encoding());
- }
- PDFErrorOr<NonnullRefPtr<Encoding>> Encoding::from_object(Document* document, NonnullRefPtr<Object> const& obj)
- {
- if (obj->is<NameObject>()) {
- auto name = obj->cast<NameObject>()->name();
- if (name == "StandardEncoding")
- return standard_encoding();
- if (name == "MacRomanEncoding")
- return mac_encoding();
- if (name == "WinAnsiEncoding")
- return windows_encoding();
- VERIFY_NOT_REACHED();
- }
- // Make a custom encoding
- auto dict = obj->cast<DictObject>();
- RefPtr<Encoding> base_encoding;
- if (dict->contains(CommonNames::BaseEncoding)) {
- auto base_encoding_obj = MUST(dict->get_object(document, CommonNames::BaseEncoding));
- base_encoding = TRY(Encoding::from_object(document, base_encoding_obj));
- } else {
- base_encoding = Encoding::standard_encoding();
- }
- auto encoding = adopt_ref(*new Encoding());
- encoding->m_descriptors = TRY(base_encoding->m_descriptors.clone());
- encoding->m_name_mapping = TRY(base_encoding->m_name_mapping.clone());
- auto differences_array = TRY(dict->get_array(document, CommonNames::Differences));
- u16 current_code_point = 0;
- bool first = true;
- for (auto& item : *differences_array) {
- if (item.has_u32()) {
- current_code_point = item.to_int();
- first = false;
- } else {
- VERIFY(item.has<NonnullRefPtr<Object>>());
- VERIFY(!first);
- auto& object = item.get<NonnullRefPtr<Object>>();
- auto name = object->cast<NameObject>()->name();
- encoding->set(current_code_point, name);
- current_code_point++;
- }
- }
- return encoding;
- }
- void Encoding::set(CharCodeType char_code, DeprecatedFlyString const& glyph_name)
- {
- m_descriptors.set(char_code, glyph_name);
- m_name_mapping.set(glyph_name, char_code);
- }
- NonnullRefPtr<Encoding> Encoding::standard_encoding()
- {
- static NonnullRefPtr<Encoding> encoding = adopt_ref(*new Encoding());
- if (encoding->m_descriptors.is_empty()) {
- #define ENUMERATE(name, standard_code, mac_code, win_code, pdf_code) \
- encoding->set(standard_code, #name);
- ENUMERATE_LATIN_CHARACTER_SET(ENUMERATE)
- #undef ENUMERATE
- }
- return encoding;
- }
- NonnullRefPtr<Encoding> Encoding::mac_encoding()
- {
- static NonnullRefPtr<Encoding> encoding = adopt_ref(*new Encoding());
- if (encoding->m_descriptors.is_empty()) {
- #define ENUMERATE(name, standard_code, mac_code, win_code, pdf_code) \
- encoding->set(mac_code, #name);
- ENUMERATE_LATIN_CHARACTER_SET(ENUMERATE)
- #undef ENUMERATE
- }
- return encoding;
- }
- NonnullRefPtr<Encoding> Encoding::windows_encoding()
- {
- static NonnullRefPtr<Encoding> encoding = adopt_ref(*new Encoding());
- if (encoding->m_descriptors.is_empty()) {
- #define ENUMERATE(name, standard_code, mac_code, win_code, pdf_code) \
- encoding->set(win_code, #name);
- ENUMERATE_LATIN_CHARACTER_SET(ENUMERATE)
- #undef ENUMERATE
- // PDF Annex D table D.2, note 3:
- // In WinAnsiEncoding, all unused codes greater than 40 (octal) map to the bullet character. However, only
- // code 225 (octal) shall be specifically assigned to the bullet character; other codes are subject to future re-assignment.
- //
- // Since CharCodeType is u8 *and* we need to include 255, we iterate in reverse order to have more readable code.
- for (CharCodeType char_code = 255; char_code > 040; char_code--) {
- if (!encoding->m_descriptors.contains(char_code))
- encoding->set(char_code, "bullet");
- }
- }
- return encoding;
- }
- NonnullRefPtr<Encoding> Encoding::pdf_doc_encoding()
- {
- static NonnullRefPtr<Encoding> encoding = adopt_ref(*new Encoding());
- if (encoding->m_descriptors.is_empty()) {
- #define ENUMERATE(name, standard_code, mac_code, win_code, pdf_code) \
- encoding->set(pdf_code, #name);
- ENUMERATE_LATIN_CHARACTER_SET(ENUMERATE)
- #undef ENUMERATE
- }
- return encoding;
- }
- NonnullRefPtr<Encoding> Encoding::symbol_encoding()
- {
- static NonnullRefPtr<Encoding> encoding = adopt_ref(*new Encoding());
- if (encoding->m_descriptors.is_empty()) {
- #define ENUMERATE(name, code) \
- encoding->set(code, #name);
- ENUMERATE_SYMBOL_CHARACTER_SET(ENUMERATE)
- #undef ENUMERATE
- }
- return encoding;
- }
- NonnullRefPtr<Encoding> Encoding::zapf_encoding()
- {
- static NonnullRefPtr<Encoding> encoding = adopt_ref(*new Encoding());
- if (encoding->m_descriptors.is_empty()) {
- #define ENUMERATE(name, code) \
- encoding->set(code, #name);
- ENUMERATE_ZAPF_DINGBATS_CHARACTER_SET(ENUMERATE)
- #undef ENUMERATE
- }
- return encoding;
- }
- u16 Encoding::get_char_code(DeprecatedString const& name) const
- {
- auto code_iterator = m_name_mapping.find(name);
- if (code_iterator != m_name_mapping.end())
- return code_iterator->value;
- return 0;
- }
- DeprecatedFlyString Encoding::get_name(u8 char_code) const
- {
- auto name_iterator = m_descriptors.find(char_code);
- if (name_iterator != m_descriptors.end())
- return name_iterator->value;
- return 0;
- }
- }
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