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Implement meta tag

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This commit is contained in:
Mike Nolan
2026-01-23 05:02:24 -06:00
parent 23df4838ff
commit ba7213e184
5 changed files with 631 additions and 12 deletions
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186
src/vm/filereader.cpp
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@@ -118,6 +118,167 @@ namespace Tesses::CrossLang
throw VMException(errorMessage);
}
TDictionary* TFile::DecodeMetadata(GCList& ls, size_t midx)
{
if(midx >= this->metadata.size()) return nullptr;
if(this->metadata[midx].second.empty()) return nullptr;
if(this->metadata[midx].second[0] != 8) return nullptr;
size_t index = 0;
auto& bytes = this->metadata[midx].second;
std::function<TObject()> parseEnt;
parseEnt = [&]()->TObject {
if(index >= bytes.size()) throw std::out_of_range("Abrupt end of metadata");
switch(bytes[index++])
{
case 0:
return false;
case 1:
return true;
case 2:
return nullptr;
case 3:
{
if(index + 8 <= bytes.size())
{
auto val= BitConverter::ToUint64BE(bytes[index]);
index+=8;
int64_t val2;
memcpy(&val2,&val,sizeof(val));
return val2;
}
else throw std::out_of_range("Abrupt end of metadata");
}
break;
case 4:
{
if(index + 8 <= bytes.size())
{
auto val= BitConverter::ToDoubleBE(bytes[index]);
index+=8;
return val;
}
else throw std::out_of_range("Abrupt end of metadata");
}
break;
case 5:
if(index + 1 <= bytes.size())
{
return (char)bytes[index++];
}
else throw std::out_of_range("Abrupt end of metadata");
break;
case 6:
{
if(index + 4 <= bytes.size())
{
auto val= BitConverter::ToUint32BE(bytes[index]);
index+=4;
return this->strings.at((size_t)val);
} else throw std::out_of_range("Abrupt end of metadata");
}
break;
case 7:
{
if(index + 4 <= bytes.size())
{
auto val= BitConverter::ToUint32BE(bytes[index]);
index+=4;
std::vector<TObject> items;
for(uint32_t i = 0; i < val; i++)
{
items.push_back(parseEnt());
}
return TList::Create(ls,items.begin(),items.end());
} else throw std::out_of_range("Abrupt end of metadata");
}
break;
case 8:
if(index + 4 <= bytes.size())
{
auto val= BitConverter::ToUint32BE(bytes[index]);
index+=4;
std::vector<TDItem> items;
for(uint32_t i = 0; i < val; i++)
{
if(index + 4 <= bytes.size())
{
auto val2= BitConverter::ToUint32BE(bytes[index]);
index+=4;
std::string& text=this->strings.at((size_t)val2);
items.emplace_back(text,parseEnt());
} else throw std::out_of_range("Abrupt end of metadata");
}
return TDictionary::Create(ls, items.begin(),items.end());
}else throw std::out_of_range("Abrupt end of metadata");
break;
case 9:
{
if(index + 4 <= bytes.size())
{
auto val= BitConverter::ToUint32BE(bytes[index]);
index+=4;
auto ba = TByteArray::Create(ls);
ba->data = this->resources.at((size_t)val);
return ba;
} else throw std::out_of_range("Abrupt end of metadata");
}
break;
case 10:
{
if(index + 4 <= bytes.size())
{
auto val= BitConverter::ToUint32BE(bytes[index]);
index+=4;
return std::make_shared<EmbedStream>(ls.GetGC(),this,val);
} else throw std::out_of_range("Abrupt end of metadata");
}
break;
case 11:
{
auto data = parseEnt();
TDictionary* dict;
if(GetObjectHeap(data,dict))
{
return std::make_shared<EmbedDirectory>(ls.GetGC(),dict);
}
else return Undefined();
}
break;
case 12:
{
if(index + 4 <= bytes.size())
{
auto val= BitConverter::ToUint32BE(bytes[index]);
index+=4;
ls.GetGC()->BarrierBegin();
auto em = TExternalMethod::Create(ls,"",{},[val,this](GCList& ls, std::vector<TObject> args)->TObject {
return std::make_shared<EmbedStream>(ls.GetGC(),this,val);
});
em->watch.push_back(this);
ls.GetGC()->BarrierEnd();
return em;
} else throw std::out_of_range("Abrupt end of metadata");
}
break;
default:
throw std::runtime_error("Invalid metadata opcode");
}
};
TDictionary* dict_res;
TObject ent = parseEnt();
if(GetObjectHeap(ent, dict_res)) return dict_res;
return nullptr;
}
void TFile::Load(GC* gc, std::shared_ptr<Tesses::Framework::Streams::Stream> stream)
{
@@ -166,10 +327,8 @@ namespace Tesses::CrossLang
}
else if(strncmp(table_name,"RESO",4) == 0) //resources (using embed)
{
std::vector<uint8_t> data;
data.resize(tableLen);
Ensure(stream,data.data(), tableLen);
this->resources.push_back(data);
auto& data = this->resources.emplace_back(tableLen);
Ensure(stream,data.data(), data.size());
}
else if(strncmp(table_name,"CHKS",4) == 0 && gc != nullptr) //chunks
{
@@ -268,13 +427,22 @@ namespace Tesses::CrossLang
this->classes.push_back(cls);
}
}
else if(strncmp(table_name,"META",4) == 0) //structured metadata
{
if(tableLen > 4)
{
auto name = this->GetString(stream);
auto& data = this->metadata.emplace_back(name, std::vector<uint8_t>(tableLen-4));
Ensure(stream,data.second.data(), tableLen-4);
}
else throw VMException("meta tag is not valid");
}
else
{
std::vector<uint8_t> data;
data.resize(tableLen);
Ensure(stream,data.data(), tableLen);
std::string key(std::string(table_name), 4);
this->sections.push_back(std::pair<std::string,std::vector<uint8_t>>(key,data));
auto& data = this->sections.emplace_back(std::string(table_name, 4), std::vector<uint8_t>(tableLen));
Ensure(stream,data.second.data(), tableLen);
}
}