зеркало из https://github.com/mozilla/gecko-dev.git
73 строки
2.5 KiB
C++
73 строки
2.5 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=99: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/scache/StartupCache.h"
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#include "jsapi.h"
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#include "jsfriendapi.h"
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#include "nsJSPrincipals.h"
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using namespace JS;
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using namespace mozilla::scache;
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using mozilla::UniquePtr;
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// We only serialize scripts with system principals. So we don't serialize the
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// principals when writing a script. Instead, when reading it back, we set the
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// principals to the system principals.
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nsresult
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ReadCachedScript(StartupCache* cache, nsACString& uri, JSContext* cx,
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MutableHandleScript scriptp)
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{
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UniquePtr<char[]> buf;
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uint32_t len;
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nsresult rv = cache->GetBuffer(PromiseFlatCString(uri).get(), &buf, &len);
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if (NS_FAILED(rv))
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return rv; // don't warn since NOT_AVAILABLE is an ok error
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JS::TranscodeBuffer buffer;
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buffer.replaceRawBuffer(reinterpret_cast<uint8_t*>(buf.release()), len);
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JS::TranscodeResult code = JS::DecodeScript(cx, buffer, scriptp);
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if (code == JS::TranscodeResult_Ok)
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return NS_OK;
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if ((code & JS::TranscodeResult_Failure) != 0)
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return NS_ERROR_FAILURE;
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MOZ_ASSERT((code & JS::TranscodeResult_Throw) != 0);
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JS_ClearPendingException(cx);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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nsresult
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WriteCachedScript(StartupCache* cache, nsACString& uri, JSContext* cx,
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HandleScript script)
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{
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MOZ_ASSERT(nsJSPrincipals::get(JS_GetScriptPrincipals(script))->GetIsSystemPrincipal());
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JS::TranscodeBuffer buffer;
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JS::TranscodeResult code = JS::EncodeScript(cx, buffer, script);
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if (code != JS::TranscodeResult_Ok) {
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if ((code & JS::TranscodeResult_Failure) != 0)
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return NS_ERROR_FAILURE;
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MOZ_ASSERT((code & JS::TranscodeResult_Throw) != 0);
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JS_ClearPendingException(cx);
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return NS_ERROR_OUT_OF_MEMORY;
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}
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size_t size = buffer.length();
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if (size > UINT32_MAX)
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return NS_ERROR_FAILURE;
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// Move the vector buffer into a unique pointer buffer.
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UniquePtr<char[]> buf(reinterpret_cast<char*>(buffer.extractOrCopyRawBuffer()));
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nsresult rv = cache->PutBuffer(PromiseFlatCString(uri).get(),
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Move(buf),
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size);
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return rv;
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}
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