Add a font API to Pepper and implement on Linux based on agl's ...

chrome/renderer/renderer_sandbox_support_linux.cc

 // Copyright (c) 2009 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 "chrome/renderer/renderer_sandbox_support_linux.h"
 
+#include <sys/stat.h>
+
+#include "base/eintr_wrapper.h"
 #include "base/global_descriptors_posix.h"
 #include "base/pickle.h"
+#include "base/scoped_ptr.h"
 #include "base/unix_domain_socket_posix.h"
 #include "chrome/common/chrome_descriptors.h"
 #include "chrome/common/sandbox_methods_linux.h"
 
 #include "third_party/WebKit/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) {
+std::string getFontFamilyForCharacters(const uint16_t* utf16,
+                                       size_t num_utf16) {
   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]);
 
   uint8_t buf[512];
   const ssize_t n = base::SendRecvMsg(GetSandboxFD(), buf, sizeof(buf), NULL,
                                       request);
 
@@ skipping 48 matching lines @@
   uint8_t reply_buf[10];
   int result_fd;
   ssize_t result = base::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, NPCharset 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;
+  base::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