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Add an error check for trying to interact with expired subtitles objects

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This commit is contained in:
Thomas Goyne 2014-03-20 13:58:58 -07:00
parent 8f96e06d0c
commit 3fa48281b0
2 changed files with 17 additions and 14 deletions
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2
src/auto4_lua.h
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@ -119,7 +119,7 @@ namespace Automation4 {
// LuaAssFile can only be deleted by the reference count hitting zero
~LuaAssFile();
public:
static LuaAssFile *GetObjPointer(lua_State *L, int idx);
static LuaAssFile *GetObjPointer(lua_State *L, int idx, bool allow_expired);
/// makes a Lua representation of AssEntry and places on the top of the stack
void AssEntryToLua(lua_State *L, size_t idx);

29
src/auto4_lua_assfile.cpp
View file

@ -103,13 +103,13 @@ namespace {
template<int (LuaAssFile::*closure)(lua_State *)>
int closure_wrapper(lua_State *L)
{
return (LuaAssFile::GetObjPointer(L, lua_upvalueindex(1))->*closure)(L);
return (LuaAssFile::GetObjPointer(L, lua_upvalueindex(1), false)->*closure)(L);
}
template<void (LuaAssFile::*closure)(lua_State *)>
template<void (LuaAssFile::*closure)(lua_State *), bool allow_expired>
int closure_wrapper_v(lua_State *L)
{
(LuaAssFile::GetObjPointer(L, lua_upvalueindex(1))->*closure)(L);
(LuaAssFile::GetObjPointer(L, lua_upvalueindex(1), allow_expired)->*closure)(L);
return 0;
}
@ -326,13 +326,13 @@ namespace Automation4 {
lua_pushvalue(L, 1);
if (strcmp(idx, "delete") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectDelete>, 1);
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectDelete, false>, 1);
else if (strcmp(idx, "deleterange") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectDeleteRange>, 1);
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectDeleteRange, false>, 1);
else if (strcmp(idx, "insert") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectInsert>, 1);
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectInsert, false>, 1);
else if (strcmp(idx, "append") == 0)
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectAppend>, 1);
lua_pushcclosure(L, closure_wrapper_v<&LuaAssFile::ObjectAppend, false>, 1);
else {
// idiot
lua_pop(L, 1);
@ -634,11 +634,14 @@ namespace Automation4 {
}
}
LuaAssFile *LuaAssFile::GetObjPointer(lua_State *L, int idx)
LuaAssFile *LuaAssFile::GetObjPointer(lua_State *L, int idx, bool allow_expired)
{
assert(lua_type(L, idx) == LUA_TUSERDATA);
void *ud = lua_touserdata(L, idx);
return *((LuaAssFile**)ud);
auto ud = lua_touserdata(L, idx);
auto laf = *static_cast<LuaAssFile **>(ud);
if (!allow_expired && laf->references < 2)
luaL_error(L, "Subtitles object is no longer valid");
return laf;
}
std::vector<AssEntry *> LuaAssFile::ProcessingComplete(wxString const& undo_description)
@ -705,9 +708,9 @@ namespace Automation4 {
// make the metatable
lua_newtable(L);
set_field(L, "__index", closure_wrapper<&LuaAssFile::ObjectIndexRead>);
set_field(L, "__newindex", closure_wrapper_v<&LuaAssFile::ObjectIndexWrite>);
set_field(L, "__newindex", closure_wrapper_v<&LuaAssFile::ObjectIndexWrite, false>);
set_field(L, "__len", closure_wrapper<&LuaAssFile::ObjectGetLen>);
set_field(L, "__gc", closure_wrapper_v<&LuaAssFile::ObjectGarbageCollect>);
set_field(L, "__gc", closure_wrapper_v<&LuaAssFile::ObjectGarbageCollect, true>);
set_field(L, "__ipairs", closure_wrapper<&LuaAssFile::ObjectIPairs>);
lua_setmetatable(L, -2);
@ -716,7 +719,7 @@ namespace Automation4 {
lua_getglobal(L, "aegisub");
set_field(L, "parse_karaoke_data", closure_wrapper<&LuaAssFile::LuaParseKaraokeData>);
set_field(L, "set_undo_point", closure_wrapper_v<&LuaAssFile::LuaSetUndoPoint>);
set_field(L, "set_undo_point", closure_wrapper_v<&LuaAssFile::LuaSetUndoPoint, false>);
lua_pop(L, 1); // pop "aegisub" table