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ifcparse: store integer attribute values as int64_t to allow out-of-range timestamps

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Setting an IfcInteger/IfcTimeStamp typed attribute (e.g. IfcOwnerHistory.CreationDate)
outside the signed 32-bit range corrupted the value instead of raising, since the
Python wrapper's set_attribute_value_py() truncated it with a plain static_cast<int>
before handing it to the C++ storage. Unix timestamps before 1901-12-13 or after
2038-01-19 silently wrapped around (e.g. 3000000000 became -1294967296) rather than
being rejected or stored correctly. Fixes #3058, equivalent to PR #8683 but ported to
this branch's rewritten ifcparse (snake_case files, variant_array/instance_data
storage, SWIG PyObject-based attribute setter) instead of the old IfcEntityInstanceData
sources, which no longer exist here.

The scalar slot of the attribute variant (Argument_INT) becomes int64_t. Integer
aggregates (Argument_AGGREGATE_OF_INT, e.g. CoordIndex) and instance/reference
identifiers stay 32-bit, since neither is the value that overflows here; this narrow
scope is kept on its own technical merits (aggregates and identifiers were never the
source of the bug, and widening them would be a much larger, riskier change for no
benefit) even though aothms said compatibility isn't a concern on this v0.9-track
branch. express::Base::set_attribute_value promotes the schema-generated int to
int64_t at a single choke point, so the generated setters keep compiling unchanged.
The STEP lexer, writer, and SWIG wrapper (set_attribute_value_py, pythonize) are all
widened together, since widening only the Python-facing setter would have silently
wrapped the value on file write instead of raising.

Verified in a build (IFC2X3 and IFC4, BUILD_IFCGEOM off, no kernels): pre-1901,
post-2038, both 32-bit boundaries, and a 9e12 value all round trip exactly both in
memory and through STEP text serialization (write then reopen). A value outside the
64-bit range now raises a clean exception instead of corrupting data. Ordinary
in-range integers and integer aggregates (e.g. IfcTriangulatedFaceSet.CoordIndex) are
unaffected. The existing util/test_attribute.py and test_file.py suites pass
unchanged; test_entity_instance.py has 5 pre-existing failures unrelated to this
change (confirmed identical on an unfixed build of this branch, caused by a missing
get_info_2 binding and _patch_swig_comparisons never being implemented here).

Generated with the assistance of an AI coding tool.
This commit is contained in:
Petru Conduraru
2026-07-19 11:44:31 +03:00
committed by Thomas Krijnen
parent d8799d799e
commit d5076bded3
6 changed files with 58 additions and 17 deletions
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src/ifcparse/parse.cpp
+18 -6
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@@ -363,9 +363,9 @@ token spf_lexer<Reader>::next() {
throw invalid_token_exception(pos, str, "instance name");
}
pop_pool_entry();
return token(pos, ttype, int_val);
return token(pos, ttype, (int64_t)int_val);
} else if (ttype == token::Token_NONE && !str.empty()) {
int int_val;
int64_t int_val;
double float_val;
auto& first = str.front();
if ((first >= 'A' && first <= 'Z') || (first >= 'a' && first <= 'z')) {
@@ -446,7 +446,7 @@ bool token::is_float() {
#endif
}
int token::as_int() {
int64_t token::as_int() {
if (type != Token_INT) {
throw invalid_token_exception(start_pos, to_string(), "integer");
}
@@ -948,7 +948,12 @@ direct_aggregate read_direct_aggregate(
storage.register_inverse((unsigned)*entity_instance_name, entity, next.value_int, attribute_index);
}
dispatch_token_direct(next, aggregate_type && aggregate_type->type_of_element()->as_named_type() ? aggregate_type->type_of_element()->as_named_type()->declared_type() : nullptr, attribute_index, logger, [&aggregate](const auto& value) {
aggregate.append(value);
// Scalar integers are parsed as int64_t, but integer aggregates remain 32-bit; narrow here.
if constexpr (std::is_same_v<std::decay_t<decltype(value)>, int64_t>) {
aggregate.append((int)value);
} else {
aggregate.append(value);
}
});
}
next = tokens->next();
@@ -1237,7 +1242,7 @@ namespace {
upper_(upper) {}
void operator()(const blank& /*i*/) { data_ << "$"; }
void operator()(const derived& /*i*/) { data_ << "*"; }
void operator()(const int& i) { data_ << i; }
void operator()(const int64_t& i) { data_ << i; }
void operator()(const bool& i) { data_ << (i ? ".T." : ".F."); }
void operator()(const boost::logic::tribool& i) { data_ << (i ? ".T." : (boost::logic::indeterminate(i) ? ".U." : ".F.")); }
void operator()(const double& i) { data_ << format_double(i); }
@@ -1578,7 +1583,12 @@ express::Base::set_attribute_value(size_t i, const T& t) {
{
void* const storage = std::visit([](const auto& m) { return (void*)&m; }, file()->storage_);
data()->set_attribute_value(i, t);
if constexpr (std::is_same_v<std::decay_t<T>, int>) {
// Integer attributes are stored as int64_t; widen the schema-generated int here.
data()->set_attribute_value(i, (int64_t)t);
} else {
data()->set_attribute_value(i, t);
}
}
auto new_attribute = get_attribute_value(i);
@@ -3421,6 +3431,7 @@ void express::Base::set_attribute_value(const std::string& name, const express::
template void IFC_PARSE_API express::Base::set_attribute_value<blank>(size_t index, const blank& value);
template void IFC_PARSE_API express::Base::set_attribute_value<derived>(size_t index, const derived& value);
template void IFC_PARSE_API express::Base::set_attribute_value<int>(size_t index, const int& value);
template void IFC_PARSE_API express::Base::set_attribute_value<int64_t>(size_t index, const int64_t& value);
template void IFC_PARSE_API express::Base::set_attribute_value<bool>(size_t index, const bool& value);
template void IFC_PARSE_API express::Base::set_attribute_value<boost::logic::tribool>(size_t index, const boost::logic::tribool& value);
template void IFC_PARSE_API express::Base::set_attribute_value<double>(size_t index, const double& value);
@@ -3439,6 +3450,7 @@ template void IFC_PARSE_API express::Base::set_attribute_value<std::vector<std::
template void IFC_PARSE_API express::Base::set_attribute_value<blank>(const std::string& name, const blank& value);
template void IFC_PARSE_API express::Base::set_attribute_value<derived>(const std::string& name, const derived& value);
template void IFC_PARSE_API express::Base::set_attribute_value<int>(const std::string& name, const int& value);
template void IFC_PARSE_API express::Base::set_attribute_value<int64_t>(const std::string& name, const int64_t& value);
template void IFC_PARSE_API express::Base::set_attribute_value<bool>(const std::string& name, const bool& value);
template void IFC_PARSE_API express::Base::set_attribute_value<boost::logic::tribool>(const std::string& name, const boost::logic::tribool& value);
template void IFC_PARSE_API express::Base::set_attribute_value<double>(const std::string& name, const double& value);