mirror of https://github.com/qpdf/qpdf.git
711 lines
23 KiB
C++
711 lines
23 KiB
C++
#include <qpdf/QPDFTokenizer.hh>
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// DO NOT USE ctype -- it is locale dependent for some things, and
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// it's not worth the risk of including it in case it may accidentally
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// be used.
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#include <qpdf/QIntC.hh>
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#include <qpdf/QPDFExc.hh>
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#include <qpdf/QPDFObjectHandle.hh>
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#include <qpdf/QTC.hh>
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#include <qpdf/QUtil.hh>
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#include <stdexcept>
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#include <stdlib.h>
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#include <string.h>
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static bool
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is_delimiter(char ch)
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{
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return (strchr(" \t\n\v\f\r()<>[]{}/%", ch) != 0);
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}
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class QPDFWordTokenFinder: public InputSource::Finder
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{
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public:
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QPDFWordTokenFinder(
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std::shared_ptr<InputSource> is, std::string const& str) :
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is(is),
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str(str)
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{
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}
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virtual ~QPDFWordTokenFinder() = default;
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virtual bool check();
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private:
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std::shared_ptr<InputSource> is;
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std::string str;
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};
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bool
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QPDFWordTokenFinder::check()
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{
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// Find a word token matching the given string, preceded by a
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// delimiter, and followed by a delimiter or EOF.
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QPDFTokenizer tokenizer;
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QPDFTokenizer::Token t = tokenizer.readToken(is, "finder", true);
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qpdf_offset_t pos = is->tell();
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if (!(t == QPDFTokenizer::Token(QPDFTokenizer::tt_word, str))) {
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QTC::TC("qpdf", "QPDFTokenizer finder found wrong word");
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return false;
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}
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qpdf_offset_t token_start = is->getLastOffset();
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char next;
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bool next_okay = false;
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if (is->read(&next, 1) == 0) {
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QTC::TC("qpdf", "QPDFTokenizer inline image at EOF");
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next_okay = true;
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} else {
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next_okay = is_delimiter(next);
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}
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is->seek(pos, SEEK_SET);
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if (!next_okay) {
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return false;
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}
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if (token_start == 0) {
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// Can't actually happen...we never start the search at the
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// beginning of the input.
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return false;
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}
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return true;
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}
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QPDFTokenizer::Members::Members() :
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allow_eof(false),
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include_ignorable(false)
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{
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reset();
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}
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void
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QPDFTokenizer::Members::reset()
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{
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state = st_top;
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type = tt_bad;
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val = "";
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raw_val = "";
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error_message = "";
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unread_char = false;
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char_to_unread = '\0';
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inline_image_bytes = 0;
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string_depth = 0;
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string_ignoring_newline = false;
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last_char_was_bs = false;
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last_char_was_cr = false;
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}
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QPDFTokenizer::Token::Token(token_type_e type, std::string const& value) :
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type(type),
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value(value),
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raw_value(value)
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{
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if (type == tt_string) {
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raw_value = QPDFObjectHandle::newString(value).unparse();
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} else if (type == tt_name) {
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raw_value = QPDFObjectHandle::newName(value).unparse();
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}
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}
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QPDFTokenizer::QPDFTokenizer() :
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m(new Members())
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{
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}
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void
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QPDFTokenizer::allowEOF()
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{
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this->m->allow_eof = true;
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}
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void
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QPDFTokenizer::includeIgnorable()
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{
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this->m->include_ignorable = true;
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}
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bool
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QPDFTokenizer::isSpace(char ch)
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{
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return ((ch == '\0') || QUtil::is_space(ch));
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}
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bool
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QPDFTokenizer::isDelimiter(char ch)
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{
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return is_delimiter(ch);
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}
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void
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QPDFTokenizer::resolveLiteral()
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{
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if ((this->m->val.length() > 0) && (this->m->val.at(0) == '/')) {
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this->m->type = tt_name;
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// Deal with # in name token. Note: '/' by itself is a
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// valid name, so don't strip leading /. That way we
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// don't have to deal with the empty string as a name.
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std::string nval = "/";
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size_t len = this->m->val.length();
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for (size_t i = 1; i < len; ++i) {
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char ch = this->m->val.at(i);
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if (ch == '#') {
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if ((i + 2 < len) &&
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QUtil::is_hex_digit(this->m->val.at(i + 1)) &&
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QUtil::is_hex_digit(this->m->val.at(i + 2))) {
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char num[3];
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num[0] = this->m->val.at(i + 1);
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num[1] = this->m->val.at(i + 2);
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num[2] = '\0';
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char ch2 = static_cast<char>(strtol(num, 0, 16));
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if (ch2 == '\0') {
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this->m->type = tt_bad;
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QTC::TC("qpdf", "QPDFTokenizer null in name");
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this->m->error_message =
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"null character not allowed in name token";
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nval += "#00";
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} else {
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nval.append(1, ch2);
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}
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i += 2;
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} else {
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QTC::TC("qpdf", "QPDFTokenizer bad name");
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this->m->error_message =
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"name with stray # will not work with PDF >= 1.2";
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// Use null to encode a bad # -- this is reversed
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// in QPDF_Name::normalizeName.
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nval += '\0';
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}
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} else {
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nval.append(1, ch);
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}
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}
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this->m->val = nval;
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} else if (QUtil::is_number(this->m->val.c_str())) {
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if (this->m->val.find('.') != std::string::npos) {
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this->m->type = tt_real;
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} else {
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this->m->type = tt_integer;
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}
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} else if ((this->m->val == "true") || (this->m->val == "false")) {
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this->m->type = tt_bool;
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} else if (this->m->val == "null") {
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this->m->type = tt_null;
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} else {
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// I don't really know what it is, so leave it as tt_word.
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// Lots of cases ($, #, etc.) other than actual words fall
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// into this category, but that's okay at least for now.
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this->m->type = tt_word;
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}
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}
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void
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QPDFTokenizer::presentCharacter(char ch)
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{
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if (this->m->state == st_token_ready) {
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throw std::logic_error(
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"INTERNAL ERROR: QPDF tokenizer presented character "
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"while token is waiting");
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}
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char orig_ch = ch;
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// State machine is implemented such that some characters may be
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// handled more than once. This happens whenever you have to use
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// the character that caused a state change in the new state.
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bool handled = true;
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if (this->m->state == st_top) {
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// Note: we specifically do not use ctype here. It is
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// locale-dependent.
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if (isSpace(ch)) {
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if (this->m->include_ignorable) {
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this->m->state = st_in_space;
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this->m->val += ch;
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}
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} else if (ch == '%') {
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this->m->state = st_in_comment;
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if (this->m->include_ignorable) {
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this->m->val += ch;
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}
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} else if (ch == '(') {
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this->m->string_depth = 1;
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this->m->string_ignoring_newline = false;
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memset(
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this->m->bs_num_register,
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'\0',
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sizeof(this->m->bs_num_register));
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this->m->last_char_was_bs = false;
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this->m->last_char_was_cr = false;
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this->m->state = st_in_string;
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} else if (ch == '<') {
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this->m->state = st_lt;
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} else if (ch == '>') {
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this->m->state = st_gt;
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} else {
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this->m->val += ch;
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if (ch == ')') {
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this->m->type = tt_bad;
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QTC::TC("qpdf", "QPDFTokenizer bad )");
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this->m->error_message = "unexpected )";
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this->m->state = st_token_ready;
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} else if (ch == '[') {
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this->m->type = tt_array_open;
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this->m->state = st_token_ready;
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} else if (ch == ']') {
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this->m->type = tt_array_close;
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this->m->state = st_token_ready;
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} else if (ch == '{') {
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this->m->type = tt_brace_open;
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this->m->state = st_token_ready;
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} else if (ch == '}') {
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this->m->type = tt_brace_close;
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this->m->state = st_token_ready;
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} else {
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this->m->state = st_literal;
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}
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}
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} else if (this->m->state == st_in_space) {
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// We only enter this state if include_ignorable is true.
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if (!isSpace(ch)) {
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this->m->type = tt_space;
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this->m->unread_char = true;
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this->m->char_to_unread = ch;
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this->m->state = st_token_ready;
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} else {
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this->m->val += ch;
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}
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} else if (this->m->state == st_in_comment) {
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if ((ch == '\r') || (ch == '\n')) {
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if (this->m->include_ignorable) {
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this->m->type = tt_comment;
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this->m->unread_char = true;
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this->m->char_to_unread = ch;
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this->m->state = st_token_ready;
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} else {
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this->m->state = st_top;
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}
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} else if (this->m->include_ignorable) {
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this->m->val += ch;
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}
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} else if (this->m->state == st_lt) {
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if (ch == '<') {
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this->m->val = "<<";
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this->m->type = tt_dict_open;
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this->m->state = st_token_ready;
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} else {
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handled = false;
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this->m->state = st_in_hexstring;
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}
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} else if (this->m->state == st_gt) {
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if (ch == '>') {
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this->m->val = ">>";
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this->m->type = tt_dict_close;
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this->m->state = st_token_ready;
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} else {
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this->m->val = ">";
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this->m->type = tt_bad;
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QTC::TC("qpdf", "QPDFTokenizer bad >");
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this->m->error_message = "unexpected >";
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this->m->unread_char = true;
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this->m->char_to_unread = ch;
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this->m->state = st_token_ready;
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}
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} else if (this->m->state == st_in_string) {
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if (this->m->string_ignoring_newline && (ch != '\n')) {
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this->m->string_ignoring_newline = false;
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}
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size_t bs_num_count = strlen(this->m->bs_num_register);
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bool ch_is_octal = ((ch >= '0') && (ch <= '7'));
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if ((bs_num_count == 3) || ((bs_num_count > 0) && (!ch_is_octal))) {
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// We've accumulated \ddd. PDF Spec says to ignore
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// high-order overflow.
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this->m->val +=
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static_cast<char>(strtol(this->m->bs_num_register, 0, 8));
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memset(
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this->m->bs_num_register,
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'\0',
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sizeof(this->m->bs_num_register));
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bs_num_count = 0;
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}
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if (this->m->string_ignoring_newline && (ch == '\n')) {
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// ignore
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this->m->string_ignoring_newline = false;
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} else if (
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ch_is_octal && (this->m->last_char_was_bs || (bs_num_count > 0))) {
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this->m->bs_num_register[bs_num_count++] = ch;
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} else if (this->m->last_char_was_bs) {
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switch (ch) {
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case 'n':
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this->m->val += '\n';
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break;
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case 'r':
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this->m->val += '\r';
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break;
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case 't':
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this->m->val += '\t';
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break;
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case 'b':
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this->m->val += '\b';
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break;
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case 'f':
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this->m->val += '\f';
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break;
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case '\n':
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break;
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case '\r':
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this->m->string_ignoring_newline = true;
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break;
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default:
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// PDF spec says backslash is ignored before anything else
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this->m->val += ch;
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break;
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}
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} else if (ch == '\\') {
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// last_char_was_bs is set/cleared below as appropriate
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if (bs_num_count) {
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throw std::logic_error(
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"INTERNAL ERROR: QPDFTokenizer: bs_num_count != 0 "
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"when ch == '\\'");
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}
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} else if (ch == '(') {
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this->m->val += ch;
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++this->m->string_depth;
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} else if ((ch == ')') && (--this->m->string_depth == 0)) {
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this->m->type = tt_string;
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this->m->state = st_token_ready;
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} else if (ch == '\r') {
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// CR by itself is converted to LF
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this->m->val += '\n';
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} else if (ch == '\n') {
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// CR LF is converted to LF
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if (!this->m->last_char_was_cr) {
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this->m->val += ch;
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}
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} else {
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this->m->val += ch;
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}
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this->m->last_char_was_cr =
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((!this->m->string_ignoring_newline) && (ch == '\r'));
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this->m->last_char_was_bs =
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((!this->m->last_char_was_bs) && (ch == '\\'));
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} else if (this->m->state == st_literal) {
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if (isDelimiter(ch)) {
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// A C-locale whitespace character or delimiter terminates
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// token. It is important to unread the whitespace
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// character even though it is ignored since it may be the
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// newline after a stream keyword. Removing it here could
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// make the stream-reading code break on some files,
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// though not on any files in the test suite as of this
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// writing.
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this->m->type = tt_word;
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this->m->unread_char = true;
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this->m->char_to_unread = ch;
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this->m->state = st_token_ready;
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} else {
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this->m->val += ch;
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}
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} else if (this->m->state == st_inline_image) {
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this->m->val += ch;
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size_t len = this->m->val.length();
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if (len == this->m->inline_image_bytes) {
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QTC::TC("qpdf", "QPDFTokenizer found EI by byte count");
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this->m->type = tt_inline_image;
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this->m->inline_image_bytes = 0;
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this->m->state = st_token_ready;
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}
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} else {
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handled = false;
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}
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if (handled) {
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// okay
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} else if (this->m->state == st_in_hexstring) {
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if (ch == '>') {
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this->m->type = tt_string;
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this->m->state = st_token_ready;
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if (this->m->val.length() % 2) {
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// PDF spec says odd hexstrings have implicit
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// trailing 0.
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this->m->val += '0';
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}
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char num[3];
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num[2] = '\0';
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std::string nval;
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for (unsigned int i = 0; i < this->m->val.length(); i += 2) {
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num[0] = this->m->val.at(i);
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num[1] = this->m->val.at(i + 1);
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char nch = static_cast<char>(strtol(num, 0, 16));
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nval += nch;
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}
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this->m->val = nval;
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} else if (QUtil::is_hex_digit(ch)) {
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this->m->val += ch;
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} else if (isSpace(ch)) {
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// ignore
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} else {
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this->m->type = tt_bad;
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QTC::TC("qpdf", "QPDFTokenizer bad hexstring character");
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this->m->error_message =
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std::string("invalid character (") + ch + ") in hexstring";
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this->m->state = st_token_ready;
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}
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} else {
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throw std::logic_error(
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"INTERNAL ERROR: invalid state while reading token");
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}
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if ((this->m->state == st_token_ready) && (this->m->type == tt_word)) {
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resolveLiteral();
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}
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if (!(betweenTokens() ||
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((this->m->state == st_token_ready) && this->m->unread_char))) {
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this->m->raw_val += orig_ch;
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}
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}
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void
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QPDFTokenizer::presentEOF()
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{
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if (this->m->state == st_literal) {
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QTC::TC("qpdf", "QPDFTokenizer EOF reading appendable token");
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resolveLiteral();
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} else if (
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(this->m->include_ignorable) && (this->m->state == st_in_space)) {
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this->m->type = tt_space;
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} else if (
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(this->m->include_ignorable) && (this->m->state == st_in_comment)) {
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this->m->type = tt_comment;
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} else if (betweenTokens()) {
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this->m->type = tt_eof;
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} else if (this->m->state != st_token_ready) {
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QTC::TC("qpdf", "QPDFTokenizer EOF reading token");
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this->m->type = tt_bad;
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this->m->error_message = "EOF while reading token";
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}
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this->m->state = st_token_ready;
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}
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void
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QPDFTokenizer::expectInlineImage(std::shared_ptr<InputSource> input)
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{
|
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if (this->m->state != st_top) {
|
|
throw std::logic_error("QPDFTokenizer::expectInlineImage called"
|
|
" when tokenizer is in improper state");
|
|
}
|
|
findEI(input);
|
|
this->m->state = st_inline_image;
|
|
}
|
|
|
|
void
|
|
QPDFTokenizer::findEI(std::shared_ptr<InputSource> input)
|
|
{
|
|
if (!input.get()) {
|
|
return;
|
|
}
|
|
|
|
qpdf_offset_t last_offset = input->getLastOffset();
|
|
qpdf_offset_t pos = input->tell();
|
|
|
|
// Use QPDFWordTokenFinder to find EI surrounded by delimiters.
|
|
// Then read the next several tokens or up to EOF. If we find any
|
|
// suspicious-looking or tokens, this is probably still part of
|
|
// the image data, so keep looking for EI. Stop at the first EI
|
|
// that passes. If we get to the end without finding one, return
|
|
// the last EI we found. Store the number of bytes expected in the
|
|
// inline image including the EI and use that to break out of
|
|
// inline image, falling back to the old method if needed.
|
|
|
|
bool okay = false;
|
|
bool first_try = true;
|
|
while (!okay) {
|
|
QPDFWordTokenFinder f(input, "EI");
|
|
if (!input->findFirst("EI", input->tell(), 0, f)) {
|
|
break;
|
|
}
|
|
this->m->inline_image_bytes = QIntC::to_size(input->tell() - pos - 2);
|
|
|
|
QPDFTokenizer check;
|
|
bool found_bad = false;
|
|
// Look at the next 10 tokens or up to EOF. The next inline
|
|
// image's image data would look like bad tokens, but there
|
|
// will always be at least 10 tokens between one inline
|
|
// image's EI and the next valid one's ID since width, height,
|
|
// bits per pixel, and color space are all required as well as
|
|
// a BI and ID. If we get 10 good tokens in a row or hit EOF,
|
|
// we can be pretty sure we've found the actual EI.
|
|
for (int i = 0; i < 10; ++i) {
|
|
QPDFTokenizer::Token t = check.readToken(input, "checker", true);
|
|
token_type_e type = t.getType();
|
|
if (type == tt_eof) {
|
|
okay = true;
|
|
} else if (type == tt_bad) {
|
|
found_bad = true;
|
|
} else if (type == tt_word) {
|
|
// The qpdf tokenizer lumps alphabetic and otherwise
|
|
// uncategorized characters into "words". We recognize
|
|
// strings of alphabetic characters as potential valid
|
|
// operators for purposes of telling whether we're in
|
|
// valid content or not. It's not perfect, but it
|
|
// should work more reliably than what we used to do,
|
|
// which was already good enough for the vast majority
|
|
// of files.
|
|
bool found_alpha = false;
|
|
bool found_non_printable = false;
|
|
bool found_other = false;
|
|
std::string value = t.getValue();
|
|
for (std::string::iterator iter = value.begin();
|
|
iter != value.end();
|
|
++iter) {
|
|
char ch = *iter;
|
|
if (((ch >= 'a') && (ch <= 'z')) ||
|
|
((ch >= 'A') && (ch <= 'Z')) || (ch == '*')) {
|
|
// Treat '*' as alpha since there are valid
|
|
// PDF operators that contain * along with
|
|
// alphabetic characters.
|
|
found_alpha = true;
|
|
} else if (
|
|
(static_cast<signed char>(ch) < 32) && (!isSpace(ch))) {
|
|
// Compare ch as a signed char so characters
|
|
// outside of 7-bit will be < 0.
|
|
found_non_printable = true;
|
|
break;
|
|
} else {
|
|
found_other = true;
|
|
}
|
|
}
|
|
if (found_non_printable || (found_alpha && found_other)) {
|
|
found_bad = true;
|
|
}
|
|
}
|
|
if (okay || found_bad) {
|
|
break;
|
|
}
|
|
}
|
|
if (!found_bad) {
|
|
okay = true;
|
|
}
|
|
if (!okay) {
|
|
first_try = false;
|
|
}
|
|
}
|
|
if (okay && (!first_try)) {
|
|
QTC::TC("qpdf", "QPDFTokenizer found EI after more than one try");
|
|
}
|
|
|
|
input->seek(pos, SEEK_SET);
|
|
input->setLastOffset(last_offset);
|
|
}
|
|
|
|
bool
|
|
QPDFTokenizer::getToken(Token& token, bool& unread_char, char& ch)
|
|
{
|
|
bool ready = (this->m->state == st_token_ready);
|
|
unread_char = this->m->unread_char;
|
|
ch = this->m->char_to_unread;
|
|
if (ready) {
|
|
if (this->m->type == tt_bad) {
|
|
this->m->val = this->m->raw_val;
|
|
}
|
|
token = Token(
|
|
this->m->type,
|
|
this->m->val,
|
|
this->m->raw_val,
|
|
this->m->error_message);
|
|
this->m->reset();
|
|
}
|
|
return ready;
|
|
}
|
|
|
|
bool
|
|
QPDFTokenizer::betweenTokens()
|
|
{
|
|
return (
|
|
(this->m->state == st_top) ||
|
|
((!this->m->include_ignorable) &&
|
|
((this->m->state == st_in_comment) ||
|
|
(this->m->state == st_in_space))));
|
|
}
|
|
|
|
QPDFTokenizer::Token
|
|
QPDFTokenizer::readToken(
|
|
std::shared_ptr<InputSource> input,
|
|
std::string const& context,
|
|
bool allow_bad,
|
|
size_t max_len)
|
|
{
|
|
qpdf_offset_t offset = input->tell();
|
|
Token token;
|
|
bool unread_char;
|
|
char char_to_unread;
|
|
bool presented_eof = false;
|
|
while (!getToken(token, unread_char, char_to_unread)) {
|
|
char ch;
|
|
if (input->read(&ch, 1) == 0) {
|
|
if (!presented_eof) {
|
|
presentEOF();
|
|
presented_eof = true;
|
|
if ((this->m->type == tt_eof) && (!this->m->allow_eof)) {
|
|
// Nothing in the qpdf library calls readToken
|
|
// without allowEOF anymore, so this case is not
|
|
// exercised.
|
|
this->m->type = tt_bad;
|
|
this->m->error_message = "unexpected EOF";
|
|
offset = input->getLastOffset();
|
|
}
|
|
} else {
|
|
throw std::logic_error(
|
|
"getToken returned false after presenting EOF");
|
|
}
|
|
} else {
|
|
presentCharacter(ch);
|
|
if (betweenTokens() && (input->getLastOffset() == offset)) {
|
|
++offset;
|
|
}
|
|
if (max_len && (this->m->raw_val.length() >= max_len) &&
|
|
(this->m->state != st_token_ready)) {
|
|
// terminate this token now
|
|
QTC::TC("qpdf", "QPDFTokenizer block long token");
|
|
this->m->type = tt_bad;
|
|
this->m->state = st_token_ready;
|
|
this->m->error_message =
|
|
"exceeded allowable length while reading token";
|
|
}
|
|
}
|
|
}
|
|
|
|
if (unread_char) {
|
|
input->unreadCh(char_to_unread);
|
|
}
|
|
|
|
if (token.getType() != tt_eof) {
|
|
input->setLastOffset(offset);
|
|
}
|
|
|
|
if (token.getType() == tt_bad) {
|
|
if (allow_bad) {
|
|
QTC::TC("qpdf", "QPDFTokenizer allowing bad token");
|
|
} else {
|
|
throw QPDFExc(
|
|
qpdf_e_damaged_pdf,
|
|
input->getName(),
|
|
context,
|
|
offset,
|
|
token.getErrorMessage());
|
|
}
|
|
}
|
|
|
|
return token;
|
|
}
|