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In QPDFParser::parse refactor handling of array_close tokens

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m-holger 2023-10-27 17:20:54 +01:00
parent 26e0bf4610
commit 12837f14b6
1 changed files with 17 additions and 12 deletions
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29
libqpdf/QPDFParser.cc
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@ -112,7 +112,20 @@ QPDFParser::parse(bool& empty, bool content_stream)
case QPDFTokenizer::tt_array_close: case QPDFTokenizer::tt_array_close:
if (state == st_array) { if (state == st_array) {
state = st_stop; if ((state_stack.size() < 2) || (stack.size() < 2)) {
throw std::logic_error("QPDFParser::parseInternal: st_stop encountered with "
"insufficient elements in stack");
}
object = QPDF_Array::create(std::move(olist), frame.null_count > 100);
setDescription(object, offset - 1);
// The `offset` points to the next of "[". Set the rewind offset to point to the
// beginning of "[". This has been explicitly tested with whitespace surrounding the
// array start delimiter. getLastOffset points to the array end token and therefore
// can't be used here.
set_offset = true;
state_stack.pop_back();
state = state_stack.back();
stack.pop_back();
} else { } else {
QTC::TC("qpdf", "QPDFParser bad array close"); QTC::TC("qpdf", "QPDFParser bad array close");
warn("treating unexpected array close token as null"); warn("treating unexpected array close token as null");
@ -273,11 +286,11 @@ QPDFParser::parse(bool& empty, bool content_stream)
if (is_null) { if (is_null) {
object = null_oh; object = null_oh;
// No need to set description for direct nulls - they probably will become implicit. // No need to set description for direct nulls - they probably will become implicit.
} else if (!indirect_ref) { } else if (!indirect_ref && !set_offset) {
setDescription(object, input->getLastOffset()); setDescription(object, input->getLastOffset());
} }
set_offset = true; set_offset = true;
olist.push_back(object); stack.back().olist.push_back(object);
break; break;
case st_top: case st_top:
@ -294,15 +307,7 @@ QPDFParser::parse(bool& empty, bool content_stream)
} }
parser_state_e old_state = state_stack.back(); parser_state_e old_state = state_stack.back();
state_stack.pop_back(); state_stack.pop_back();
if (old_state == st_array) { if (old_state == st_dictionary) {
object = QPDF_Array::create(std::move(olist), frame.null_count > 100);
setDescription(object, offset - 1);
// The `offset` points to the next of "[". Set the rewind offset to point to the
// beginning of "[". This has been explicitly tested with whitespace surrounding the
// array start delimiter. getLastOffset points to the array end token and therefore
// can't be used here.
set_offset = true;
} else if (old_state == st_dictionary) {
// Convert list to map. Alternating elements are keys. Attempt to recover more or // Convert list to map. Alternating elements are keys. Attempt to recover more or
// less gracefully from invalid dictionaries. // less gracefully from invalid dictionaries.
std::set<std::string> names; std::set<std::string> names;