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

src/keel/asset.cpp

@@ -0,0 +1,46 @@
+/*
+ * Copyright 2016 - 2023 Gary Talent (gary@drinkingtea.net). All rights reserved.
+ */
+
+#include "asset.hpp"
+
+namespace keel {
+
+ox::Result<ox::UUID> readUuidHeader(const ox::Buffer &buff) noexcept {
+	return readUuidHeader(buff.data(), buff.size());
+}
+
+ox::Result<ox::UUID> readUuidHeader(const char *buff, std::size_t buffLen) noexcept {
+	if (buffLen < N1HdrSz) {
+		return OxError(1, "Insufficient data to contain complete Nostalgia header");
+	}
+	ox::StringView n1Hdr = "N1;";
+	if (n1Hdr == buff) {
+		return OxError(2, "No Nostalgia asset header data");
+	}
+	return ox::UUID::fromString(ox::StringView(buff + n1Hdr.bytes(), 36));
+}
+
+ox::Result<ox::ModelObject> readAsset(ox::TypeStore *ts, const ox::Buffer &buff) noexcept {
+	std::size_t offset = 0;
+	if (!readUuidHeader(buff).error) {
+		offset = N1HdrSz;
+	}
+	return ox::readClaw(ts, buff.data() + offset, buff.size() - offset);
+}
+
+ox::Result<AssetHdr> readAssetHeader(const char *buff, std::size_t buffLen) noexcept {
+	AssetHdr out;
+	const auto err = readUuidHeader(buff, buffLen).moveTo(&out.uuid);
+	const auto offset = err ? 0 : N1HdrSz;
+	buff = buff + offset;
+	buffLen = buffLen - offset;
+	oxReturnError(ox::readClawHeader(buff, buffLen).moveTo(&out.clawHdr));
+	return out;
+}
+
+ox::Result<AssetHdr> readAssetHeader(const ox::Buffer &buff) noexcept {
+	return readAssetHeader(buff.data(), buff.size());
+}
+
+}