68 lines
1.5 KiB
C++
68 lines
1.5 KiB
C++
// Copyright (c) Facebook, Inc. and its affiliates.
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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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#pragma once
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#include <cstdint>
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#include <cstring>
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#include <folly/Portability.h>
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#ifndef RN_EXPORT
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#define RN_EXPORT __attribute__((visibility("default")))
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#endif
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namespace facebook {
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namespace react {
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/*
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* ScriptTag
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*
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* Scripts given to the JS Executors to run could be in any of the following
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* formats. They are tagged so the executor knows how to run them.
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*/
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enum struct ScriptTag {
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String = 0,
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RAMBundle,
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BCBundle,
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};
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/**
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* BundleHeader
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*
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* RAM bundles and BC bundles begin with headers. For RAM bundles this is
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* 4 bytes, for BC bundles this is 12 bytes. This structure holds the first 12
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* bytes from a bundle in a way that gives access to that information.
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*/
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FOLLY_PACK_PUSH
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struct FOLLY_PACK_ATTR BundleHeader {
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BundleHeader() {
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std::memset(this, 0, sizeof(BundleHeader));
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}
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uint32_t magic;
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uint32_t reserved_;
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uint32_t version;
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};
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FOLLY_PACK_POP
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/**
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* parseTypeFromHeader
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*
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* Takes the first 8 bytes of a bundle, and returns a tag describing the
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* bundle's format.
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*/
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RN_EXPORT ScriptTag parseTypeFromHeader(const BundleHeader& header);
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/**
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* stringForScriptTag
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*
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* Convert an `ScriptTag` enum into a string, useful for emitting in errors
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* and diagnostic messages.
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*/
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RN_EXPORT const char* stringForScriptTag(const ScriptTag& tag);
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} // namespace react
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} // namespace facebook
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