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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/common/font_config_ipc_linux.h"
#include <errno.h>
#include <fcntl.h>
#include <stdint.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/uio.h>
#include <unistd.h>
#include "base/files/file_util.h"
#include "base/files/memory_mapped_file.h"
#include "base/memory/ref_counted.h"
#include "base/pickle.h"
#include "base/posix/unix_domain_socket_linux.h"
#include "base/threading/thread_restrictions.h"
#include "base/trace_event/trace_event.h"
#include "skia/ext/refptr.h"
#include "skia/ext/skia_utils_base.h"
#include "third_party/skia/include/core/SkData.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/core/SkTypeface.h"
namespace BASE_HASH_NAMESPACE {
std::size_t hash<SkFontConfigInterface::FontIdentity>::operator()(
const SkFontConfigInterface::FontIdentity& sp) const {
hash<std::string> stringhash;
hash<int> inthash;
size_t r = inthash(sp.fID);
r = r * 41 + inthash(sp.fTTCIndex);
r = r * 41 + stringhash(sp.fString.c_str());
r = r * 41 + inthash(sp.fStyle.weight());
r = r * 41 + inthash(sp.fStyle.slant());
r = r * 41 + inthash(sp.fStyle.width());
return r;
}
} // namespace BASE_HASH_NAMESPACE
namespace content {
// Wikpedia's main country selection page activates 21 fallback fonts,
// doubling this we should be on the generous side as an upper bound,
// but nevertheless not have the mapped typefaces cache grow excessively.
const size_t kMaxMappedTypefaces = 42;
void CloseFD(int fd) {
int err = IGNORE_EINTR(close(fd));
DCHECK(!err);
}
FontConfigIPC::FontConfigIPC(int fd)
: fd_(fd)
, mapped_typefaces_(kMaxMappedTypefaces) {
}
FontConfigIPC::~FontConfigIPC() {
CloseFD(fd_);
}
bool FontConfigIPC::matchFamilyName(const char familyName[],
SkTypeface::Style requestedStyle,
FontIdentity* outFontIdentity,
SkString* outFamilyName,
SkTypeface::Style* outStyle) {
TRACE_EVENT0("sandbox_ipc", "FontConfigIPC::matchFamilyName");
size_t familyNameLen = familyName ? strlen(familyName) : 0;
if (familyNameLen > kMaxFontFamilyLength)
return false;
base::Pickle request;
request.WriteInt(METHOD_MATCH);
request.WriteData(familyName, familyNameLen);
request.WriteUInt32(requestedStyle);
uint8_t reply_buf[2048];
const ssize_t r = base::UnixDomainSocket::SendRecvMsg(
fd_, reply_buf, sizeof(reply_buf), NULL, request);
if (r == -1)
return false;
base::Pickle reply(reinterpret_cast<char*>(reply_buf), r);
base::PickleIterator iter(reply);
bool result;
if (!iter.ReadBool(&result))
return false;
if (!result)
return false;
SkString reply_family;
FontIdentity reply_identity;
uint32_t reply_style;
if (!skia::ReadSkString(&iter, &reply_family) ||
!skia::ReadSkFontIdentity(&iter, &reply_identity) ||
!iter.ReadUInt32(&reply_style)) {
return false;
}
if (outFontIdentity)
*outFontIdentity = reply_identity;
if (outFamilyName)
*outFamilyName = reply_family;
if (outStyle)
*outStyle = static_cast<SkTypeface::Style>(reply_style);
return true;
}
static void DestroyMemoryMappedFile(const void*, void* context) {
base::ThreadRestrictions::ScopedAllowIO allow_munmap;
delete static_cast<base::MemoryMappedFile*>(context);
}
SkMemoryStream* FontConfigIPC::mapFileDescriptorToStream(int fd) {
scoped_ptr<base::MemoryMappedFile> mapped_font_file(
new base::MemoryMappedFile);
base::ThreadRestrictions::ScopedAllowIO allow_mmap;
mapped_font_file->Initialize(base::File(fd));
DCHECK(mapped_font_file->IsValid());
auto data = skia::AdoptRef(
SkData::NewWithProc(mapped_font_file->data(), mapped_font_file->length(),
&DestroyMemoryMappedFile, mapped_font_file.get()));
if (!data)
return nullptr;
ignore_result(mapped_font_file.release()); // Ownership transferred to SkDataB
return new SkMemoryStream(data.get());
}
SkStreamAsset* FontConfigIPC::openStream(const FontIdentity& identity) {
TRACE_EVENT0("sandbox_ipc", "FontConfigIPC::openStream");
base::Pickle request;
request.WriteInt(METHOD_OPEN);
request.WriteUInt32(identity.fID);
int result_fd = -1;
uint8_t reply_buf[256];
const ssize_t r = base::UnixDomainSocket::SendRecvMsg(
fd_, reply_buf, sizeof(reply_buf), &result_fd, request);
if (r == -1)
return NULL;
base::Pickle reply(reinterpret_cast<char*>(reply_buf), r);
bool result;
base::PickleIterator iter(reply);
if (!iter.ReadBool(&result) || !result) {
if (result_fd)
CloseFD(result_fd);
return NULL;
}
return mapFileDescriptorToStream(result_fd);
}
SkTypeface* FontConfigIPC::createTypeface(
const SkFontConfigInterface::FontIdentity& identity) {
base::AutoLock lock(lock_);
auto mapped_typefaces_it = mapped_typefaces_.Get(identity);
if (mapped_typefaces_it != mapped_typefaces_.end())
return SkSafeRef(mapped_typefaces_it->second.get());
SkStreamAsset* typeface_stream = openStream(identity);
if (!typeface_stream)
return nullptr;
skia::RefPtr<SkTypeface> typeface_from_stream = skia::AdoptRef(
SkTypeface::CreateFromStream(typeface_stream, identity.fTTCIndex));
auto mapped_typefaces_insert_it =
mapped_typefaces_.Put(identity, typeface_from_stream);
return SkSafeRef(mapped_typefaces_insert_it->second.get());
}
} // namespace content
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