Make the Pepper proxy support in-process font rendering.

content/renderer/renderer_sandbox_support_linux.cc

-// Copyright (c) 2011 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/renderer/renderer_sandbox_support_linux.h"
-
-#include <sys/stat.h>
-
-#include "base/eintr_wrapper.h"
-#include "base/global_descriptors_posix.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/pickle.h"
-#include "content/common/chrome_descriptors.h"
-#include "content/common/sandbox_methods_linux.h"
-#include "content/common/unix_domain_socket_posix.h"
-
-#include "third_party/WebKit/Source/WebKit/chromium/public/linux/WebFontRenderStyle.h"
-
-static int GetSandboxFD() {
-  return kSandboxIPCChannel + base::GlobalDescriptors::kBaseDescriptor;
-}
-
-namespace renderer_sandbox_support {
-
-std::string getFontFamilyForCharacters(const uint16_t* utf16,
-                                       size_t num_utf16,
-                                       const char* preferred_locale) {
-  Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_GET_FONT_FAMILY_FOR_CHARS);
-  request.WriteInt(num_utf16);
-  for (size_t i = 0; i < num_utf16; ++i)
-    request.WriteUInt32(utf16[i]);
-  request.WriteString(preferred_locale);
-
-  uint8_t buf[512];
-  const ssize_t n = UnixDomainSocket::SendRecvMsg(GetSandboxFD(), buf,
-                                                  sizeof(buf), NULL, request);
-
-  std::string family_name;
-  if (n != -1) {
-    Pickle reply(reinterpret_cast<char*>(buf), n);
-    void* pickle_iter = NULL;
-    reply.ReadString(&pickle_iter, &family_name);
-  }
-
-  return family_name;
-}
-
-void getRenderStyleForStrike(const char* family, int sizeAndStyle,
-                             WebKit::WebFontRenderStyle* out) {
-  Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_GET_STYLE_FOR_STRIKE);
-  request.WriteString(family);
-  request.WriteInt(sizeAndStyle);
-
-  uint8_t buf[512];
-  const ssize_t n = UnixDomainSocket::SendRecvMsg(GetSandboxFD(), buf,
-                                                  sizeof(buf), NULL, request);
-
-  out->setDefaults();
-  if (n == -1) {
-    return;
-  }
-
-  Pickle reply(reinterpret_cast<char*>(buf), n);
-  void* pickle_iter = NULL;
-  int useBitmaps, useAutoHint, useHinting, hintStyle, useAntiAlias, useSubpixel;
-  if (reply.ReadInt(&pickle_iter, &useBitmaps) &&
-      reply.ReadInt(&pickle_iter, &useAutoHint) &&
-      reply.ReadInt(&pickle_iter, &useHinting) &&
-      reply.ReadInt(&pickle_iter, &hintStyle) &&
-      reply.ReadInt(&pickle_iter, &useAntiAlias) &&
-      reply.ReadInt(&pickle_iter, &useSubpixel)) {
-    out->useBitmaps = useBitmaps;
-    out->useAutoHint = useAutoHint;
-    out->useHinting = useHinting;
-    out->hintStyle = hintStyle;
-    out->useAntiAlias = useAntiAlias;
-    out->useSubpixel = useSubpixel;
-  }
-}
-
-int MakeSharedMemorySegmentViaIPC(size_t length, bool executable) {
-  Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_MAKE_SHARED_MEMORY_SEGMENT);
-  request.WriteUInt32(length);
-  uint8_t reply_buf[10];
-  int result_fd;
-  ssize_t result = UnixDomainSocket::SendRecvMsg(GetSandboxFD(),
-                                                 reply_buf, sizeof(reply_buf),
-                                                 &result_fd, request);
-  if (result == -1)
-    return -1;
-  return result_fd;
-}
-
-int MatchFontWithFallback(const std::string& face, bool bold,
-                          bool italic, int charset) {
-  Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_MATCH_WITH_FALLBACK);
-  request.WriteString(face);
-  request.WriteBool(bold);
-  request.WriteBool(italic);
-  request.WriteUInt32(charset);
-  uint8_t reply_buf[64];
-  int fd = -1;
-  UnixDomainSocket::SendRecvMsg(GetSandboxFD(), reply_buf, sizeof(reply_buf),
-                                &fd, request);
-  return fd;
-}
-
-bool GetFontTable(int fd, uint32_t table, uint8_t* output,
-                  size_t* output_length) {
-  if (table == 0) {
-    struct stat st;
-    if (fstat(fd, &st) < 0)
-      return false;
-    size_t length = st.st_size;
-    if (!output) {
-      *output_length = length;
-      return true;
-    }
-    if (*output_length < length)
-      return false;
-    *output_length = length;
-    ssize_t n = HANDLE_EINTR(pread(fd, output, length, 0));
-    if (n != static_cast<ssize_t>(length))
-      return false;
-    return true;
-  }
-
-  unsigned num_tables;
-  uint8_t num_tables_buf[2];
-
-  ssize_t n = HANDLE_EINTR(pread(fd, &num_tables_buf, sizeof(num_tables_buf),
-                           4 /* skip the font type */));
-  if (n != sizeof(num_tables_buf))
-    return false;
-
-  num_tables = static_cast<unsigned>(num_tables_buf[0]) << 8 |
-               num_tables_buf[1];
-
-  // The size in bytes of an entry in the table directory.
-  static const unsigned kTableEntrySize = 16;
-  scoped_array<uint8_t> table_entries(
-      new uint8_t[num_tables * kTableEntrySize]);
-  n = HANDLE_EINTR(pread(fd, table_entries.get(), num_tables * kTableEntrySize,
-                         12 /* skip the SFNT header */));
-  if (n != static_cast<ssize_t>(num_tables * kTableEntrySize))
-    return false;
-
-  size_t offset;
-  size_t length = 0;
-  for (unsigned i = 0; i < num_tables; i++) {
-    const uint8_t* entry = table_entries.get() + i * kTableEntrySize;
-    if (memcmp(entry, &table, sizeof(table)) == 0) {
-      offset = static_cast<size_t>(entry[8]) << 24 |
-               static_cast<size_t>(entry[9]) << 16 |
-               static_cast<size_t>(entry[10]) << 8  |
-               static_cast<size_t>(entry[11]);
-      length = static_cast<size_t>(entry[12]) << 24 |
-               static_cast<size_t>(entry[13]) << 16 |
-               static_cast<size_t>(entry[14]) << 8  |
-               static_cast<size_t>(entry[15]);
-
-      break;
-    }
-  }
-
-  if (!length)
-    return false;
-
-  if (!output) {
-    *output_length = length;
-    return true;
-  }
-
-  if (*output_length < length)
-    return false;
-
-  *output_length = length;
-  n = HANDLE_EINTR(pread(fd, output, length, offset));
-  if (n != static_cast<ssize_t>(length))
-    return false;
-
-  return true;
-}
-
-}  // namespace render_sandbox_support