48 строки
1.2 KiB
C++
48 строки
1.2 KiB
C++
/*
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#include "JSBundleType.h"
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namespace facebook {
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namespace react {
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static uint32_t constexpr RAMBundleMagicNumber = 0xFB0BD1E5;
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static uint32_t constexpr MetroHBCBundleMagicNumber = 0xFFE7C3C3;
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// "Hermes" in ancient Greek encoded in UTF-16BE and truncated to 8 bytes.
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static uint64_t constexpr HermesBCBundleMagicNumber = 0x1F1903C103BC1FC6;
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ScriptTag parseTypeFromHeader(const BundleHeader &header) {
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switch (header.magic32.value) {
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case RAMBundleMagicNumber:
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return ScriptTag::RAMBundle;
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case MetroHBCBundleMagicNumber:
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return ScriptTag::MetroHBCBundle;
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default:
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return ScriptTag::String;
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}
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}
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const char *stringForScriptTag(const ScriptTag &tag) {
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switch (tag) {
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case ScriptTag::String:
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return "String";
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case ScriptTag::RAMBundle:
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return "RAM Bundle";
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case ScriptTag::MetroHBCBundle:
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return "Metro Hermes Bytecode Bundle";
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}
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return "";
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}
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bool isHermesBytecodeBundle(const BundleHeader &header) {
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return header.magic64 == HermesBCBundleMagicNumber;
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}
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} // namespace react
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} // namespace facebook
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