mirror of https://github.com/qpdf/qpdf.git
121 lines
3.4 KiB
C++
121 lines
3.4 KiB
C++
#include <qpdf/QPDF_Name.hh>
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#include <qpdf/JSON_writer.hh>
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#include <qpdf/QUtil.hh>
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QPDF_Name::QPDF_Name(std::string const& name) :
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QPDFValue(::ot_name, "name"),
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name(name)
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{
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}
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std::shared_ptr<QPDFObject>
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QPDF_Name::create(std::string const& name)
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{
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return do_create(new QPDF_Name(name));
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}
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std::shared_ptr<QPDFObject>
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QPDF_Name::copy(bool shallow)
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{
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return create(name);
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}
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std::string
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QPDF_Name::normalizeName(std::string const& name)
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{
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if (name.empty()) {
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return name;
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}
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std::string result;
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result += name.at(0);
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for (size_t i = 1; i < name.length(); ++i) {
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char ch = name.at(i);
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// Don't use locale/ctype here; follow PDF spec guidelines.
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if (ch == '\0') {
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// QPDFTokenizer embeds a null character to encode an invalid #.
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result += "#";
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} else if (
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ch < 33 || ch == '#' || ch == '/' || ch == '(' || ch == ')' || ch == '{' || ch == '}' ||
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ch == '<' || ch == '>' || ch == '[' || ch == ']' || ch == '%' || ch > 126) {
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result += QUtil::hex_encode_char(ch);
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} else {
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result += ch;
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}
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}
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return result;
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}
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std::string
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QPDF_Name::unparse()
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{
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return normalizeName(this->name);
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}
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std::pair<bool, bool>
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QPDF_Name::analyzeJSONEncoding(const std::string& name)
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{
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int tail = 0; // Number of continuation characters expected.
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bool tail2 = false; // Potential overlong 3 octet utf-8.
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bool tail3 = false; // potential overlong 4 octet
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bool needs_escaping = false;
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for (auto const& it: name) {
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auto c = static_cast<unsigned char>(it);
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if (tail) {
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if ((c & 0xc0) != 0x80) {
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return {false, false};
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}
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if (tail2) {
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if ((c & 0xe0) == 0x80) {
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return {false, false};
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}
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tail2 = false;
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} else if (tail3) {
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if ((c & 0xf0) == 0x80) {
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return {false, false};
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}
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tail3 = false;
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}
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tail--;
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} else if (c < 0x80) {
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if (!needs_escaping) {
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needs_escaping = !((c > 34 && c != '\\') || c == ' ' || c == 33);
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}
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} else if ((c & 0xe0) == 0xc0) {
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if ((c & 0xfe) == 0xc0) {
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return {false, false};
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}
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tail = 1;
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} else if ((c & 0xf0) == 0xe0) {
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tail2 = (c == 0xe0);
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tail = 2;
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} else if ((c & 0xf8) == 0xf0) {
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tail3 = (c == 0xf0);
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tail = 3;
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} else {
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return {false, false};
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}
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}
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return {tail == 0, !needs_escaping};
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}
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void
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QPDF_Name::writeJSON(int json_version, JSON::Writer& p)
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{
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// For performance reasons this code is duplicated in QPDF_Dictionary::writeJSON. When updating
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// this method make sure QPDF_Dictionary is also update.
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if (json_version == 1) {
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p << "\"" << JSON::Writer::encode_string(normalizeName(name)) << "\"";
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} else {
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if (auto res = analyzeJSONEncoding(name); res.first) {
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if (res.second) {
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p << "\"" << name << "\"";
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} else {
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p << "\"" << JSON::Writer::encode_string(name) << "\"";
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}
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} else {
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p << "\"n:" << JSON::Writer::encode_string(normalizeName(name)) << "\"";
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}
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}
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}
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