bazinga

src/import/RomManifest.lua

@@ -0,0 +1,25 @@
+-- The per-version import metadata (symbol table + ROM hash) that drives
+-- RomExtractor.  Split out of RomImporter so the extraction worker thread can
+-- decode it itself: shipping the decoded table across a love.thread channel
+-- would deep-copy every symbol for nothing.
+
+local GameVersion = require("src.core.GameVersion")
+
+local RomManifest = {}
+
+function RomManifest.decode(version)
+  local info = GameVersion.info(version)
+  local raw, readError = love.filesystem.read(info.manifest)
+  if not raw then
+    error("ROM import metadata is missing: " .. tostring(readError))
+  end
+  local Json = require("src.link.Json")
+  local manifest, decodeError = Json.decode(raw)
+  if not manifest then
+    error("ROM import metadata is invalid: " .. tostring(decodeError))
+  end
+  assert(manifest.romSha1 == info.sha1, "ROM import metadata version mismatch")
+  return manifest
+end
+
+return RomManifest