Remove content/browser dependency on WebFontRenderStyle.

content/common/child_process_sandbox_support_impl_linux.cc

-// 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/child_process_sandbox_support_impl_linux.h"
-
-#include <stddef.h>
-#include <sys/stat.h>
-
-#include <limits>
-#include <memory>
-
-#include "base/numerics/safe_conversions.h"
-#include "base/pickle.h"
-#include "base/posix/eintr_wrapper.h"
-#include "base/posix/unix_domain_socket_linux.h"
-#include "base/sys_byteorder.h"
-#include "base/trace_event/trace_event.h"
-#include "content/common/sandbox_linux/sandbox_linux.h"
-#include "third_party/WebKit/public/platform/linux/WebFallbackFont.h"
-#include "third_party/WebKit/public/platform/linux/WebFontRenderStyle.h"
-
-namespace content {
-
-void GetFallbackFontForCharacter(int32_t character,
-                                 const char* preferred_locale,
-                                 blink::WebFallbackFont* fallbackFont) {
-  TRACE_EVENT0("sandbox_ipc", "GetFontFamilyForCharacter");
-
-  base::Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_GET_FALLBACK_FONT_FOR_CHAR);
-  request.WriteInt(character);
-  request.WriteString(preferred_locale);
-
-  uint8_t buf[512];
-  const ssize_t n = base::UnixDomainSocket::SendRecvMsg(
-      GetSandboxFD(), buf, sizeof(buf), NULL, request);
-
-  std::string family_name;
-  std::string filename;
-  int fontconfigInterfaceId = 0;
-  int ttcIndex = 0;
-  bool isBold = false;
-  bool isItalic = false;
-  if (n != -1) {
-    base::Pickle reply(reinterpret_cast<char*>(buf), n);
-    base::PickleIterator pickle_iter(reply);
-    if (pickle_iter.ReadString(&family_name) &&
-        pickle_iter.ReadString(&filename) &&
-        pickle_iter.ReadInt(&fontconfigInterfaceId) &&
-        pickle_iter.ReadInt(&ttcIndex) &&
-        pickle_iter.ReadBool(&isBold) &&
-        pickle_iter.ReadBool(&isItalic)) {
-      fallbackFont->name = family_name;
-      fallbackFont->filename = filename;
-      fallbackFont->fontconfigInterfaceId = fontconfigInterfaceId;
-      fallbackFont->ttcIndex = ttcIndex;
-      fallbackFont->isBold = isBold;
-      fallbackFont->isItalic = isItalic;
-    }
-  }
-}
-
-void GetRenderStyleForStrike(const char* family,
-                             int size_and_style,
-                             blink::WebFontRenderStyle* out) {
-  TRACE_EVENT0("sandbox_ipc", "GetRenderStyleForStrike");
-
-  out->setDefaults();
-
-  if (size_and_style < 0)
-    return;
-
-  const bool bold = size_and_style & 1;
-  const bool italic = size_and_style & 2;
-  const int pixel_size = size_and_style >> 2;
-  if (pixel_size > std::numeric_limits<uint16_t>::max())
-    return;
-
-  base::Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_GET_STYLE_FOR_STRIKE);
-  request.WriteString(family);
-  request.WriteBool(bold);
-  request.WriteBool(italic);
-  request.WriteUInt16(pixel_size);
-
-  uint8_t buf[512];
-  const ssize_t n = base::UnixDomainSocket::SendRecvMsg(
-      GetSandboxFD(), buf, sizeof(buf), NULL, request);
-  if (n == -1)
-    return;
-
-  base::Pickle reply(reinterpret_cast<char*>(buf), n);
-  base::PickleIterator pickle_iter(reply);
-  int use_bitmaps, use_autohint, use_hinting, hint_style, use_antialias;
-  int use_subpixel_rendering, use_subpixel_positioning;
-  if (pickle_iter.ReadInt(&use_bitmaps) &&
-      pickle_iter.ReadInt(&use_autohint) &&
-      pickle_iter.ReadInt(&use_hinting) &&
-      pickle_iter.ReadInt(&hint_style) &&
-      pickle_iter.ReadInt(&use_antialias) &&
-      pickle_iter.ReadInt(&use_subpixel_rendering) &&
-      pickle_iter.ReadInt(&use_subpixel_positioning)) {
-    out->useBitmaps = use_bitmaps;
-    out->useAutoHint = use_autohint;
-    out->useHinting = use_hinting;
-    out->hintStyle = hint_style;
-    out->useAntiAlias = use_antialias;
-    out->useSubpixelRendering = use_subpixel_rendering;
-    out->useSubpixelPositioning = use_subpixel_positioning;
-  }
-}
-
-int MatchFontWithFallback(const std::string& face,
-                          bool bold,
-                          bool italic,
-                          int charset,
-                          PP_BrowserFont_Trusted_Family fallback_family) {
-  TRACE_EVENT0("sandbox_ipc", "MatchFontWithFallback");
-
-  base::Pickle request;
-  request.WriteInt(LinuxSandbox::METHOD_MATCH_WITH_FALLBACK);
-  request.WriteString(face);
-  request.WriteBool(bold);
-  request.WriteBool(italic);
-  request.WriteUInt32(charset);
-  request.WriteUInt32(fallback_family);
-  uint8_t reply_buf[64];
-  int fd = -1;
-  base::UnixDomainSocket::SendRecvMsg(
-      GetSandboxFD(), reply_buf, sizeof(reply_buf), &fd, request);
-  return fd;
-}
-
-bool GetFontTable(int fd, uint32_t table_tag, off_t offset,
-                  uint8_t* output, size_t* output_length) {
-  if (offset < 0)
-    return false;
-
-  size_t data_length = 0;  // the length of the file data.
-  off_t data_offset = 0;   // the offset of the data in the file.
-  if (table_tag == 0) {
-    // Get the entire font file.
-    struct stat st;
-    if (fstat(fd, &st) < 0)
-      return false;
-    data_length = base::checked_cast<size_t>(st.st_size);
-  } else {
-    // Get a font table. Read the header to find its offset in the file.
-    uint16_t num_tables;
-    ssize_t n = HANDLE_EINTR(pread(fd, &num_tables, sizeof(num_tables),
-                             4 /* skip the font type */));
-    if (n != sizeof(num_tables))
-      return false;
-    // Font data is stored in net (big-endian) order.
-    num_tables = base::NetToHost16(num_tables);
-
-    // Read the table directory.
-    static const size_t kTableEntrySize = 16;
-    const size_t directory_size = num_tables * kTableEntrySize;
-    std::unique_ptr<uint8_t[]> table_entries(new uint8_t[directory_size]);
-    n = HANDLE_EINTR(pread(fd, table_entries.get(), directory_size,
-                           12 /* skip the SFNT header */));
-    if (n != base::checked_cast<ssize_t>(directory_size))
-      return false;
-
-    for (uint16_t i = 0; i < num_tables; ++i) {
-      uint8_t* entry = table_entries.get() + i * kTableEntrySize;
-      uint32_t tag = *reinterpret_cast<uint32_t*>(entry);
-      if (tag == table_tag) {
-        // Font data is stored in net (big-endian) order.
-        data_offset =
-            base::NetToHost32(*reinterpret_cast<uint32_t*>(entry + 8));
-        data_length =
-            base::NetToHost32(*reinterpret_cast<uint32_t*>(entry + 12));
-        break;
-      }
-    }
-  }
-
-  if (!data_length)
-    return false;
-  // Clamp |offset| inside the allowable range. This allows the read to succeed
-  // but return 0 bytes.
-  offset = std::min(offset, base::checked_cast<off_t>(data_length));
-  // Make sure it's safe to add the data offset and the caller's logical offset.
-  // Define the maximum positive offset on 32 bit systems.
-  static const off_t kMaxPositiveOffset32 = 0x7FFFFFFF;  // 2 GB - 1.
-  if ((offset > kMaxPositiveOffset32 / 2) ||
-      (data_offset > kMaxPositiveOffset32 / 2))
-    return false;
-  data_offset += offset;
-  data_length -= offset;
-
-  if (output) {
-    // 'output_length' holds the maximum amount of data the caller can accept.
-    data_length = std::min(data_length, *output_length);
-    ssize_t n = HANDLE_EINTR(pread(fd, output, data_length, data_offset));
-    if (n != base::checked_cast<ssize_t>(data_length))
-      return false;
-  }
-  *output_length = data_length;
-
-  return true;
-}
-
-}  // namespace content