make compression lib

src/logic/scripting/lua/libs/libcompression.cpp

@@ -0,0 +1,84 @@
+#include "api_lua.hpp"
+#include "coders/gzip.hpp"
+#include "../lua_engine.hpp"
+
+static int l_encode(lua::State* L) {
+    char argc = lua::gettop(L);
+    std::vector<unsigned char> compressedBytes;
+
+    std::string algo = "gzip";
+    if (argc >= 2) {
+        if (!lua::isstring(L, 2)) {
+            throw std::runtime_error("compression algorithm must be a string");
+        }
+        algo = lua::require_lstring(L, 2);
+    }
+
+    if (algo == "gzip") {
+        auto str = lua::bytearray_as_string(L, 1);
+        compressedBytes = gzip::compress(
+            reinterpret_cast<const ubyte*>(str.data()),
+            str.size()
+        );
+    } else {
+        throw std::runtime_error("unsupported compression algorithm");
+    }
+
+    if (argc < 3 || !lua::toboolean(L, 3)) {
+        lua::create_bytearray(L, std::move(compressedBytes));
+    } else {
+        size_t length = compressedBytes.size();
+        lua::createtable(L, length, 0);
+        int newTable = lua::gettop(L);
+        for (size_t i = 0; i < length; i++) {
+            lua::pushinteger(L, compressedBytes.data()[i]);
+            lua::rawseti(L, i + 1, newTable);
+        }
+    }
+
+    return 1;
+}
+
+static int l_decode(lua::State* L) {
+    char argc = lua::gettop(L);
+    std::vector<unsigned char> decompressedBytes;
+
+    std::string algo = "gzip";
+    if (argc >= 2) {
+        if (!lua::isstring(L, 2)) {
+            throw std::runtime_error("compression algorithm must be a string");
+        }
+        algo = lua::require_lstring(L, 2);
+    }
+
+    if (algo == "gzip") {
+        auto str = lua::bytearray_as_string(L, 1);
+        decompressedBytes = gzip::decompress(
+            reinterpret_cast<const ubyte*>(str.data()),
+            str.size()
+        );
+    } else {
+        throw std::runtime_error("unsupported compression algorithm");
+    }
+
+    if (argc < 3 || !lua::toboolean(L, 3)) {
+        lua::create_bytearray(L, std::move(decompressedBytes));
+    } else {
+        size_t length = decompressedBytes.size();
+        lua::createtable(L, length, 0);
+        int newTable = lua::gettop(L);
+        for (size_t i = 0; i < length; i++) {
+            lua::pushinteger(L, decompressedBytes.data()[i]);
+            lua::rawseti(L, i + 1, newTable);
+        }
+    }
+
+    return 1;
+}
+
+const luaL_Reg compressionlib[] = {
+    {"encode", lua::wrap<l_encode>},
+    {"decode", lua::wrap<l_decode>},
+    {NULL, NULL}
+};
+