content/common/font_config_ipc_linux.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/common/font_config_ipc_linux.h"
   6
   7 #include <errno.h>
   8 #include <fcntl.h>
   9 #include <sys/mman.h>
  10 #include <sys/socket.h>
  11 #include <sys/stat.h>
  12 #include <sys/uio.h>
  13 #include <unistd.h>
  14
  15 #include "base/files/file_util.h"
  16 #include "base/files/memory_mapped_file.h"
  17 #include "base/memory/ref_counted.h"
  18 #include "base/pickle.h"
  19 #include "base/posix/unix_domain_socket_linux.h"
  20 #include "base/threading/thread_restrictions.h"
  21 #include "base/trace_event/trace_event.h"
  22 #include "skia/ext/refptr.h"
  23 #include "skia/ext/skia_utils_base.h"
  24 #include "third_party/skia/include/core/SkData.h"
  25 #include "third_party/skia/include/core/SkStream.h"
  26 #include "third_party/skia/include/core/SkTypeface.h"
  27
  28 namespace content {
  29
  30 class FontConfigIPC::MappedFontFile
  31     : public base::RefCountedThreadSafe<MappedFontFile> {
  32  public:
  33   explicit MappedFontFile(uint32_t font_id) : font_id_(font_id) {}
  34
  35   uint32_t font_id() const { return font_id_; }
  36
  37   bool Initialize(int fd) {
  38     base::ThreadRestrictions::ScopedAllowIO allow_mmap;
  39     return mapped_font_file_.Initialize(base::File(fd));
  40   }
  41
  42   SkMemoryStream* CreateMemoryStream() {
  43     DCHECK(mapped_font_file_.IsValid());
  44     auto data = skia::AdoptRef(SkData::NewWithProc(
  45         mapped_font_file_.data(), mapped_font_file_.length(),
  46         &MappedFontFile::ReleaseProc, this));
  47     if (!data)
  48       return nullptr;
  49     AddRef();
  50     return new SkMemoryStream(data.get());
  51   }
  52
  53  private:
  54   friend class base::RefCountedThreadSafe<MappedFontFile>;
  55
  56   ~MappedFontFile() {
  57     auto font_config = static_cast<FontConfigIPC*>(FontConfigIPC::RefGlobal());
  58     font_config->RemoveMappedFontFile(this);
  59   }
  60
  61   static void ReleaseProc(const void* ptr, void* context) {
  62     base::ThreadRestrictions::ScopedAllowIO allow_munmap;
  63     static_cast<MappedFontFile*>(context)->Release();
  64   }
  65
  66   uint32_t font_id_;
  67   base::MemoryMappedFile mapped_font_file_;
  68 };
  69
  70 void CloseFD(int fd) {
  71   int err = IGNORE_EINTR(close(fd));
  72   DCHECK(!err);
  73 }
  74
  75 FontConfigIPC::FontConfigIPC(int fd)
  76     : fd_(fd) {
  77 }
  78
  79 FontConfigIPC::~FontConfigIPC() {
  80   CloseFD(fd_);
  81 }
  82
  83 bool FontConfigIPC::matchFamilyName(const char familyName[],
  84                                     SkTypeface::Style requestedStyle,
  85                                     FontIdentity* outFontIdentity,
  86                                     SkString* outFamilyName,
  87                                     SkTypeface::Style* outStyle) {
  88   TRACE_EVENT0("sandbox_ipc", "FontConfigIPC::matchFamilyName");
  89   size_t familyNameLen = familyName ? strlen(familyName) : 0;
  90   if (familyNameLen > kMaxFontFamilyLength)
  91     return false;
  92
  93   base::Pickle request;
  94   request.WriteInt(METHOD_MATCH);
  95   request.WriteData(familyName, familyNameLen);
  96   request.WriteUInt32(requestedStyle);
  97
  98   uint8_t reply_buf[2048];
  99   const ssize_t r = base::UnixDomainSocket::SendRecvMsg(
 100       fd_, reply_buf, sizeof(reply_buf), NULL, request);
 101   if (r == -1)
 102     return false;
 103
 104   base::Pickle reply(reinterpret_cast<char*>(reply_buf), r);
 105   base::PickleIterator iter(reply);
 106   bool result;
 107   if (!iter.ReadBool(&result))
 108     return false;
 109   if (!result)
 110     return false;
 111
 112   SkString     reply_family;
 113   FontIdentity reply_identity;
 114   uint32_t     reply_style;
 115   if (!skia::ReadSkString(&iter, &reply_family) ||
 116       !skia::ReadSkFontIdentity(&iter, &reply_identity) ||
 117       !iter.ReadUInt32(&reply_style)) {
 118     return false;
 119   }
 120
 121   if (outFontIdentity)
 122     *outFontIdentity = reply_identity;
 123   if (outFamilyName)
 124     *outFamilyName = reply_family;
 125   if (outStyle)
 126     *outStyle = static_cast<SkTypeface::Style>(reply_style);
 127
 128   return true;
 129 }
 130
 131 SkStreamAsset* FontConfigIPC::openStream(const FontIdentity& identity) {
 132   TRACE_EVENT0("sandbox_ipc", "FontConfigIPC::openStream");
 133
 134   {
 135     base::AutoLock lock(lock_);
 136     auto mapped_font_files_it = mapped_font_files_.find(identity.fID);
 137     if (mapped_font_files_it != mapped_font_files_.end())
 138       return mapped_font_files_it->second->CreateMemoryStream();
 139   }
 140
 141   base::Pickle request;
 142   request.WriteInt(METHOD_OPEN);
 143   request.WriteUInt32(identity.fID);
 144
 145   int result_fd = -1;
 146   uint8_t reply_buf[256];
 147   const ssize_t r = base::UnixDomainSocket::SendRecvMsg(
 148       fd_, reply_buf, sizeof(reply_buf), &result_fd, request);
 149   if (r == -1)
 150     return NULL;
 151
 152   base::Pickle reply(reinterpret_cast<char*>(reply_buf), r);
 153   bool result;
 154   base::PickleIterator iter(reply);
 155   if (!iter.ReadBool(&result) || !result) {
 156     if (result_fd)
 157       CloseFD(result_fd);
 158     return NULL;
 159   }
 160
 161   scoped_refptr<MappedFontFile> mapped_font_file =
 162       new MappedFontFile(identity.fID);
 163   if (!mapped_font_file->Initialize(result_fd))
 164     return nullptr;
 165
 166   {
 167     base::AutoLock lock(lock_);
 168     auto mapped_font_files_it =
 169         mapped_font_files_.insert(std::make_pair(mapped_font_file->font_id(),
 170                                                  mapped_font_file.get())).first;
 171     return mapped_font_files_it->second->CreateMemoryStream();
 172   }
 173 }
 174
 175 void FontConfigIPC::RemoveMappedFontFile(MappedFontFile* mapped_font_file) {
 176   base::AutoLock lock(lock_);
 177   mapped_font_files_.erase(mapped_font_file->font_id());
 178 }
 179
 180 }  // namespace content
 181