[keel] Split out Nostalgia Foundation and Pack lib into Keel

src/keel/typeconv.cpp

@@ -0,0 +1,62 @@
+/*
+ * Copyright 2016 - 2023 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#include <ox/claw/read.hpp>
+
+#include "media.hpp"
+#include "typeconv.hpp"
+
+namespace keel {
+
+#ifndef OX_BARE_METAL
+
+[[nodiscard]]
+static ox::Result<const BaseConverter*> findConverter(
+		keel::Context *ctx,
+		ox::CRStringView srcTypeName, int srcTypeVersion,
+		ox::CRStringView dstTypeName, int dstTypeVersion) noexcept {
+	for (auto &c : ctx->converters) {
+		if (c->matches(srcTypeName, srcTypeVersion, dstTypeName, dstTypeVersion)) {
+			return c;
+		}
+	}
+	return OxError(1, "Could not find converter");
+};
+
+static ox::Result<ox::UniquePtr<Wrap>> convert(
+		keel::Context *ctx, const ox::Buffer &srcBuffer,
+		ox::CRStringView srcTypeName, int srcTypeVersion,
+		ox::CRStringView dstTypeName, int dstTypeVersion) noexcept {
+	// look for direct converter
+	auto [c, err] = findConverter(ctx, srcTypeName, srcTypeVersion, dstTypeName, dstTypeVersion);
+	if (!err) {
+		return c->convertBuffToPtr(ctx, srcBuffer);
+	}
+	// try to chain multiple converters
+	for (const auto &subConverter : ctx->converters) {
+		if (!subConverter->dstMatches(dstTypeName, dstTypeVersion)) {
+			continue;
+		}
+		const auto [intermediate, chainErr] =
+			convert(ctx, srcBuffer, srcTypeName, srcTypeVersion,
+			        subConverter->srcTypeName(), subConverter->srcTypeVersion());
+		if (!chainErr) {
+			return subConverter->convertPtrToPtr(ctx, intermediate.get());
+		}
+	}
+	return OxError(1, "Could not convert between types");
+}
+
+ox::Result<ox::UniquePtr<Wrap>> convert(
+		keel::Context *ctx,
+		const ox::Buffer &srcBuffer,
+		ox::CRStringView dstTypeName,
+		int dstTypeVersion) noexcept {
+	oxRequire(hdr, readAssetHeader(srcBuffer));
+	return convert(ctx, srcBuffer, hdr.clawHdr.typeName, hdr.clawHdr.typeVersion, dstTypeName, dstTypeVersion);
+}
+
+#endif
+
+}