src/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/debug/trace_event.h"
  16 #include "base/file_util.h"
  17 #include "base/pickle.h"
  18 #include "base/posix/unix_domain_socket_linux.h"
  19 #include "skia/ext/refptr.h"
  20 #include "skia/ext/skia_utils_base.h"
  21 #include "third_party/skia/include/core/SkData.h"
  22 #include "third_party/skia/include/core/SkStream.h"
  23
  24 namespace content {
  25
  26 // Return a stream from the file descriptor, or NULL on failure.
  27 SkStream* StreamFromFD(int fd) {
  28   skia::RefPtr<SkData> data = skia::AdoptRef(SkData::NewFromFD(fd));
  29   if (!data) {
  30     return NULL;
  31   }
  32   return new SkMemoryStream(data.get());
  33 }
  34
  35 void CloseFD(int fd) {
  36   int err = IGNORE_EINTR(close(fd));
  37   DCHECK(!err);
  38 }
  39
  40 FontConfigIPC::FontConfigIPC(int fd)
  41     : fd_(fd) {
  42 }
  43
  44 FontConfigIPC::~FontConfigIPC() {
  45   CloseFD(fd_);
  46 }
  47
  48 bool FontConfigIPC::matchFamilyName(const char familyName[],
  49                                     SkTypeface::Style requestedStyle,
  50                                     FontIdentity* outFontIdentity,
  51                                     SkString* outFamilyName,
  52                                     SkTypeface::Style* outStyle) {
  53   TRACE_EVENT0("sandbox_ipc", "FontConfigIPC::matchFamilyName");
  54   size_t familyNameLen = familyName ? strlen(familyName) : 0;
  55   if (familyNameLen > kMaxFontFamilyLength)
  56     return false;
  57
  58   Pickle request;
  59   request.WriteInt(METHOD_MATCH);
  60   request.WriteData(familyName, familyNameLen);
  61   request.WriteUInt32(requestedStyle);
  62
  63   uint8_t reply_buf[2048];
  64   const ssize_t r = UnixDomainSocket::SendRecvMsg(fd_, reply_buf,
  65                                                   sizeof(reply_buf), NULL,
  66                                                   request);
  67   if (r == -1)
  68     return false;
  69
  70   Pickle reply(reinterpret_cast<char*>(reply_buf), r);
  71   PickleIterator iter(reply);
  72   bool result;
  73   if (!reply.ReadBool(&iter, &result))
  74     return false;
  75   if (!result)
  76     return false;
  77
  78   SkString     reply_family;
  79   FontIdentity reply_identity;
  80   uint32_t     reply_style;
  81   if (!skia::ReadSkString(reply, &iter, &reply_family) ||
  82       !skia::ReadSkFontIdentity(reply, &iter, &reply_identity) ||
  83       !reply.ReadUInt32(&iter, &reply_style)) {
  84     return false;
  85   }
  86
  87   if (outFontIdentity)
  88     *outFontIdentity = reply_identity;
  89   if (outFamilyName)
  90     *outFamilyName = reply_family;
  91   if (outStyle)
  92     *outStyle = static_cast<SkTypeface::Style>(reply_style);
  93
  94   return true;
  95 }
  96
  97 SkStream* FontConfigIPC::openStream(const FontIdentity& identity) {
  98   TRACE_EVENT0("sandbox_ipc", "FontConfigIPC::openStream");
  99   Pickle request;
 100   request.WriteInt(METHOD_OPEN);
 101   request.WriteUInt32(identity.fID);
 102
 103   int result_fd = -1;
 104   uint8_t reply_buf[256];
 105   const ssize_t r = UnixDomainSocket::SendRecvMsg(fd_, reply_buf,
 106                                                   sizeof(reply_buf),
 107                                                   &result_fd, request);
 108
 109   if (r == -1)
 110     return NULL;
 111
 112   Pickle reply(reinterpret_cast<char*>(reply_buf), r);
 113   bool result;
 114   PickleIterator iter(reply);
 115   if (!reply.ReadBool(&iter, &result) ||
 116       !result) {
 117     if (result_fd)
 118       CloseFD(result_fd);
 119     return NULL;
 120   }
 121
 122   SkStream* stream = StreamFromFD(result_fd);
 123   CloseFD(result_fd);
 124   return stream;
 125 }
 126
 127 }  // namespace content
 128