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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 = base_encoding->m_descriptors;
encoding->m_name_mapping = base_encoding->m_name_mapping;
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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