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Verify that compact page encoding is safe

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Since page size can be customized let's do a special validation check for
compact encoding. Right now it's redundant since page size is limited by
64k in alloc_string, but that may change in the future.
This commit is contained in:
Arseny Kapoulkine 2014-11-06 09:33:05 +01:00
parent 224b9b7ba7
commit 56349939e4
1 changed files with 2 additions and 0 deletions
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2
src/pugixml.cpp
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@ -667,6 +667,8 @@ PUGI__NS_BEGIN
public: public:
compact_header(xml_memory_page* page, unsigned int flags) compact_header(xml_memory_page* page, unsigned int flags)
{ {
PUGI__STATIC_ASSERT(sizeof(xml_memory_page) + xml_memory_page_size <= (1 << (16 + compact_alignment_log2)));
ptrdiff_t page_offset = (reinterpret_cast<char*>(this) - reinterpret_cast<char*>(page)) >> compact_alignment_log2; ptrdiff_t page_offset = (reinterpret_cast<char*>(this) - reinterpret_cast<char*>(page)) >> compact_alignment_log2;
assert(page_offset >= 0 && page_offset < (1 << 16)); assert(page_offset >= 0 && page_offset < (1 << 16));