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Fix crash on zero-length lua files

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This commit is contained in:
Thomas Goyne 2014-04-27 20:41:43 -07:00
parent 9492192b73
commit b4de0b9b82
1 changed files with 3 additions and 0 deletions
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libaegisub/common/file_mapping.cpp
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@ -35,6 +35,9 @@ char *map(int64_t s_offset, uint64_t length, boost::interprocess::mode_t mode,
uint64_t file_size, agi::file_mapping const& file,
std::unique_ptr<mapped_region>& region, uint64_t& mapping_start)
{
static char dummy = 0;
if (length == 0) return &dummy;
auto offset = static_cast<uint64_t>(s_offset);
if (offset + length > file_size)
throw agi::InternalError("Attempted to map beyond end of file", nullptr);