зеркало из https://github.com/mozilla/gecko-dev.git
368 строки
12 KiB
C++
368 строки
12 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 "nsHyphenator.h"
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#include "mozilla/dom/ContentChild.h"
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#include "nsContentUtils.h"
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#include "nsIChannel.h"
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#include "nsIFile.h"
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#include "nsIFileURL.h"
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#include "nsIInputStream.h"
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#include "nsIJARURI.h"
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#include "nsIURI.h"
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#include "nsNetUtil.h"
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#include "nsUnicodeProperties.h"
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#include "nsUTF8Utils.h"
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#include "mapped_hyph.h"
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using namespace mozilla;
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void DefaultDelete<const HyphDic>::operator()(const HyphDic* aHyph) const {
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mapped_hyph_free_dictionary(const_cast<HyphDic*>(aHyph));
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}
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static const void* GetItemPtrFromJarURI(nsIJARURI* aJAR, uint32_t* aLength) {
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// Try to get the jarfile's nsZipArchive, find the relevant item, and return
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// a pointer to its data provided it is stored uncompressed.
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nsCOMPtr<nsIURI> jarFile;
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if (NS_FAILED(aJAR->GetJARFile(getter_AddRefs(jarFile)))) {
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return nullptr;
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}
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nsCOMPtr<nsIFileURL> fileUrl = do_QueryInterface(jarFile);
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if (!fileUrl) {
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return nullptr;
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}
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nsCOMPtr<nsIFile> file;
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fileUrl->GetFile(getter_AddRefs(file));
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if (!file) {
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return nullptr;
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}
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RefPtr<CacheAwareZipReader> archive = Omnijar::GetReader(file);
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if (archive) {
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nsCString path;
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aJAR->GetJAREntry(path);
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return archive->GetData(path.get(), aLength);
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}
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return nullptr;
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}
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already_AddRefed<ipc::SharedMemoryBasic> GetHyphDictFromParent(
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nsIURI* aURI, uint32_t* aLength) {
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MOZ_ASSERT(!XRE_IsParentProcess());
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ipc::SharedMemoryBasic::Handle handle = ipc::SharedMemoryBasic::NULLHandle();
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uint32_t size;
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MOZ_ASSERT(aURI);
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if (!dom::ContentChild::GetSingleton()->SendGetHyphDict(aURI, &handle,
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&size)) {
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return nullptr;
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}
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RefPtr<ipc::SharedMemoryBasic> shm = new ipc::SharedMemoryBasic();
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if (!shm->IsHandleValid(handle)) {
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return nullptr;
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}
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if (!shm->SetHandle(handle, ipc::SharedMemoryBasic::RightsReadOnly)) {
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return nullptr;
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}
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if (!shm->Map(size)) {
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return nullptr;
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}
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char* addr = static_cast<char*>(shm->memory());
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if (!addr) {
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return nullptr;
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}
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*aLength = size;
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return shm.forget();
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}
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static already_AddRefed<ipc::SharedMemoryBasic> LoadInShmemFromURI(
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nsIURI* aURI, uint32_t* aLength) {
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MOZ_ASSERT(XRE_IsParentProcess());
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nsCOMPtr<nsIChannel> channel;
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if (NS_FAILED(NS_NewChannel(getter_AddRefs(channel), aURI,
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nsContentUtils::GetSystemPrincipal(),
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nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_IS_NULL,
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nsIContentPolicy::TYPE_OTHER))) {
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return nullptr;
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}
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nsCOMPtr<nsIInputStream> instream;
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if (NS_FAILED(channel->Open(getter_AddRefs(instream)))) {
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return nullptr;
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}
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// Check size, bail out if it is excessively large (the largest of the
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// hyphenation files currently shipped with Firefox is around 1MB
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// uncompressed).
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uint64_t available;
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if (NS_FAILED(instream->Available(&available)) || !available ||
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available > 16 * 1024 * 1024) {
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return nullptr;
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}
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// The shm-related calls here are not expected to fail, but if they do,
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// we'll just return null (as if the resource was unavailable) and proceed
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// without hyphenation.
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RefPtr<ipc::SharedMemoryBasic> shm = new ipc::SharedMemoryBasic();
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if (!shm->Create(available)) {
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return nullptr;
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}
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if (!shm->Map(available)) {
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return nullptr;
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}
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char* buffer = static_cast<char*>(shm->memory());
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if (!buffer) {
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return nullptr;
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}
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uint32_t bytesRead = 0;
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if (NS_FAILED(instream->Read(buffer, available, &bytesRead)) ||
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bytesRead != available) {
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return nullptr;
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}
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*aLength = bytesRead;
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return shm.forget();
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}
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nsHyphenator::nsHyphenator(nsIURI* aURI, bool aHyphenateCapitalized)
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: mDict(static_cast<const void*>(nullptr)),
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mDictSize(0),
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mHyphenateCapitalized(aHyphenateCapitalized) {
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nsCOMPtr<nsIJARURI> jar = do_QueryInterface(aURI);
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if (jar) {
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// This gives us a raw pointer into the omnijar's data (if uncompressed);
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// we do not own it and must not attempt to free it!
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const void* ptr = GetItemPtrFromJarURI(jar, &mDictSize);
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if (ptr) {
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if (mapped_hyph_is_valid_hyphenator(static_cast<const uint8_t*>(ptr),
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mDictSize)) {
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mDict = AsVariant(ptr);
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return;
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}
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} else {
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// Omnijar must be compressed (currently this is the case on Android).
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// If we're the parent process, decompress the resource into a shmem
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// buffer; if we're a child, send a request to the parent for the
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// shared-memory copy (which it will load if not already available).
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RefPtr<ipc::SharedMemoryBasic> shm;
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if (XRE_IsParentProcess()) {
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shm = LoadInShmemFromURI(aURI, &mDictSize);
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if (shm && mapped_hyph_is_valid_hyphenator(
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static_cast<const uint8_t*>(shm->memory()), mDictSize)) {
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mDict = AsVariant(shm);
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return;
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}
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} else {
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shm = GetHyphDictFromParent(aURI, &mDictSize);
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if (shm) {
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// We don't need to validate mDict because the parent process
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// will have done so.
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mDict = AsVariant(shm);
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return;
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}
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}
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}
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}
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if (net::SchemeIsFile(aURI)) {
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// Ask the Rust lib to mmap the file. In this case our mDictSize field
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// remains zero; mDict is not a pointer to the raw data but an opaque
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// reference to a Rust object, and can only be freed by passing it to
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// mapped_hyph_free_dictionary().
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// (This case occurs in unpackaged developer builds.)
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nsAutoCString path;
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aURI->GetFilePath(path);
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#if XP_WIN
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// GetFilePath returns the path with an unexpected leading slash (like
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// "/c:/path/to/firefox/...") that may prevent it being found if it's an
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// absolute Windows path starting with a drive letter.
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// So check for this case and strip the slash.
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if (path.Length() > 2 && path[0] == '/' && path[2] == ':') {
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path.Cut(0, 1);
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}
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#endif
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UniquePtr<const HyphDic> dic(mapped_hyph_load_dictionary(path.get()));
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if (dic) {
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mDict = AsVariant(std::move(dic));
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return;
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}
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}
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nsAutoCString msg;
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aURI->GetSpec(msg);
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msg.Insert("Invalid hyphenation resource: ", 0);
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NS_ASSERTION(false, msg.get());
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}
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bool nsHyphenator::IsValid() {
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return mDict.match(
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[](const void*& ptr) { return ptr != nullptr; },
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[](RefPtr<ipc::SharedMemoryBasic>& shm) { return shm != nullptr; },
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[](mozilla::UniquePtr<const HyphDic>& hyph) { return hyph != nullptr; });
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}
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nsresult nsHyphenator::Hyphenate(const nsAString& aString,
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nsTArray<bool>& aHyphens) {
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if (!aHyphens.SetLength(aString.Length(), fallible)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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memset(aHyphens.Elements(), false, aHyphens.Length() * sizeof(bool));
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bool inWord = false;
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uint32_t wordStart = 0, wordLimit = 0;
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uint32_t chLen;
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for (uint32_t i = 0; i < aString.Length(); i += chLen) {
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uint32_t ch = aString[i];
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chLen = 1;
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if (NS_IS_HIGH_SURROGATE(ch)) {
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if (i + 1 < aString.Length() && NS_IS_LOW_SURROGATE(aString[i + 1])) {
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ch = SURROGATE_TO_UCS4(ch, aString[i + 1]);
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chLen = 2;
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} else {
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NS_WARNING("unpaired surrogate found during hyphenation");
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}
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}
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nsUGenCategory cat = unicode::GetGenCategory(ch);
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if (cat == nsUGenCategory::kLetter || cat == nsUGenCategory::kMark) {
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if (!inWord) {
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inWord = true;
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wordStart = i;
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}
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wordLimit = i + chLen;
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if (i + chLen < aString.Length()) {
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continue;
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}
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}
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if (inWord) {
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HyphenateWord(aString, wordStart, wordLimit, aHyphens);
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inWord = false;
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}
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}
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return NS_OK;
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}
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void nsHyphenator::HyphenateWord(const nsAString& aString, uint32_t aStart,
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uint32_t aLimit, nsTArray<bool>& aHyphens) {
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// Convert word from aStart and aLimit in aString to utf-8 for mapped_hyph,
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// lowercasing it as we go so that it will match the (lowercased) patterns
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// (bug 1105644).
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nsAutoCString utf8;
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const char16_t* cur = aString.BeginReading() + aStart;
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const char16_t* end = aString.BeginReading() + aLimit;
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bool firstLetter = true;
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while (cur < end) {
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uint32_t ch = *cur++;
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if (NS_IS_HIGH_SURROGATE(ch)) {
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if (cur < end && NS_IS_LOW_SURROGATE(*cur)) {
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ch = SURROGATE_TO_UCS4(ch, *cur++);
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} else {
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return; // unpaired surrogate: bail out, don't hyphenate broken text
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}
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} else if (NS_IS_LOW_SURROGATE(ch)) {
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return; // unpaired surrogate
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}
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// XXX What about language-specific casing? Consider Turkish I/i...
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// In practice, it looks like the current patterns will not be
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// affected by this, as they treat dotted and undotted i similarly.
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uint32_t origCh = ch;
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ch = ToLowerCase(ch);
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if (ch != origCh) {
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// Avoid hyphenating capitalized words (bug 1550532) unless explicitly
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// allowed by prefs for the language in use.
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// Also never auto-hyphenate a word that has internal caps, as it may
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// well be an all-caps acronym or a quirky name like iTunes.
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if (!mHyphenateCapitalized || !firstLetter) {
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return;
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}
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}
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firstLetter = false;
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if (ch < 0x80) { // U+0000 - U+007F
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utf8.Append(ch);
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} else if (ch < 0x0800) { // U+0100 - U+07FF
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utf8.Append(0xC0 | (ch >> 6));
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utf8.Append(0x80 | (0x003F & ch));
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} else if (ch < 0x10000) { // U+0800 - U+D7FF,U+E000 - U+FFFF
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utf8.Append(0xE0 | (ch >> 12));
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utf8.Append(0x80 | (0x003F & (ch >> 6)));
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utf8.Append(0x80 | (0x003F & ch));
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} else {
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utf8.Append(0xF0 | (ch >> 18));
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utf8.Append(0x80 | (0x003F & (ch >> 12)));
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utf8.Append(0x80 | (0x003F & (ch >> 6)));
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utf8.Append(0x80 | (0x003F & ch));
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}
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}
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AutoTArray<uint8_t, 200> hyphenValues;
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hyphenValues.SetLength(utf8.Length());
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int32_t result = mDict.match(
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[&](const void*& ptr) {
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return mapped_hyph_find_hyphen_values_raw(
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static_cast<const uint8_t*>(ptr), mDictSize, utf8.BeginReading(),
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utf8.Length(), hyphenValues.Elements(), hyphenValues.Length());
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},
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[&](RefPtr<mozilla::ipc::SharedMemoryBasic>& shm) {
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return mapped_hyph_find_hyphen_values_raw(
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static_cast<const uint8_t*>(shm->memory()), mDictSize,
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utf8.BeginReading(), utf8.Length(), hyphenValues.Elements(),
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hyphenValues.Length());
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},
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[&](mozilla::UniquePtr<const HyphDic>& hyph) {
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return mapped_hyph_find_hyphen_values_dic(
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hyph.get(), utf8.BeginReading(), utf8.Length(),
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hyphenValues.Elements(), hyphenValues.Length());
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});
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if (result > 0) {
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// We need to convert UTF-8 indexing as used by the hyphenation lib into
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// UTF-16 indexing of the aHyphens[] array for Gecko.
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uint32_t utf16index = 0;
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for (uint32_t utf8index = 0; utf8index < utf8.Length();) {
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// We know utf8 is valid, so we only need to look at the first byte of
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// each character to determine its length and the corresponding UTF-16
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// length to add to utf16index.
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const uint8_t leadByte = utf8[utf8index];
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if (leadByte < 0x80) {
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utf8index += 1;
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} else if (leadByte < 0xE0) {
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utf8index += 2;
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} else if (leadByte < 0xF0) {
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utf8index += 3;
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} else {
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utf8index += 4;
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}
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// The hyphenation value of interest is the one for the last code unit
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// of the utf-8 character, and is recorded on the last code unit of the
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// utf-16 character (in the case of a surrogate pair).
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utf16index += leadByte >= 0xF0 ? 2 : 1;
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if (utf16index > 0 && (hyphenValues[utf8index - 1] & 0x01)) {
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aHyphens[aStart + utf16index - 1] = true;
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}
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}
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}
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}
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void nsHyphenator::ShareToProcess(base::ProcessId aPid,
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ipc::SharedMemoryBasic::Handle* aOutHandle,
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uint32_t* aOutSize) {
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// If the resource is invalid, or if we fail to share it to the child
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// process, we'll just bail out and continue without hyphenation; no need
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// for this to be a fatal error.
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if (!mDict.is<RefPtr<mozilla::ipc::SharedMemoryBasic>>()) {
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return;
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}
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if (!mDict.as<RefPtr<mozilla::ipc::SharedMemoryBasic>>()->ShareToProcess(
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aPid, aOutHandle)) {
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return;
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}
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*aOutSize = mDictSize;
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}
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