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// 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) {
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);
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 = base::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) {
Pickle request;
request.WriteInt(LinuxSandbox::METHOD_MAKE_SHARED_MEMORY_SEGMENT);
request.WriteUInt32(length);
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, 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;
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
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