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Fixed required field checking incorrectly using unsigned offsets.

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Reported by: https://github.com/google/flatbuffers/issues/99

Change-Id: Ia26da95bbac189836c257fa85f3bec1b153b6207
Tested: on Linux.
This commit is contained in:
Wouter van Oortmerssen
2014-11-07 14:36:49 -08:00
parent 118abc2871
commit 8ef6ee2a3e
1 changed files with 2 additions and 2 deletions
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4
include/flatbuffers/flatbuffers.h
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@@ -515,7 +515,7 @@ class FlatBufferBuilder {
uoffset_t EndTable(uoffset_t start, voffset_t numfields) {
// Write the vtable offset, which is the start of any Table.
// We fill it's value later.
auto vtableoffsetloc = PushElement<uoffset_t>(0);
auto vtableoffsetloc = PushElement<soffset_t>(0);
// Write a vtable, which consists entirely of voffset_t elements.
// It starts with the number of offsets, followed by a type id, followed
// by the offsets themselves. In reverse:
@@ -564,7 +564,7 @@ class FlatBufferBuilder {
// just been constructed.
template<typename T> void Required(Offset<T> table, voffset_t field) {
auto table_ptr = buf_.data_at(table.o);
auto vtable_ptr = table_ptr - ReadScalar<uoffset_t>(table_ptr);
auto vtable_ptr = table_ptr - ReadScalar<soffset_t>(table_ptr);
bool ok = ReadScalar<voffset_t>(vtable_ptr + field) != 0;
// If this fails, the caller will show what field needs to be set.
assert(ok);