skia/ext/SkFontHost_fontconfig_ipc.cpp

/* libs/graphics/ports/SkFontHost_fontconfig_direct.cpp
**
** Copyright 2009, Google Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
**     http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/

// http://code.google.com/p/chromium/wiki/LinuxSandboxIPC

#include "SkFontHost_fontconfig_ipc.h"

#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/uio.h>

#include "base/pickle.h"
#include "base/unix_domain_socket_posix.h"

FontConfigIPC::FontConfigIPC(int fd)
    : fd_(fd) {
}

FontConfigIPC::~FontConfigIPC() {
    close(fd_);
}

bool FontConfigIPC::Match(std::string* result_family,
                          unsigned* result_fileid,
                          bool fileid_valid, unsigned fileid,
                          const std::string& family, bool* is_bold,
                          bool* is_italic) {
    if (family.length() > kMaxFontFamilyLength)
      return false;

    Pickle request;
    request.WriteInt(METHOD_MATCH);
    request.WriteBool(fileid_valid);
    if (fileid_valid)
      request.WriteUInt32(fileid);

    request.WriteBool(is_bold && *is_bold);
    request.WriteBool(is_bold && *is_italic);

    request.WriteString(family);

    uint8_t reply_buf[512];
    const ssize_t r = base::SendRecvMsg(fd_, reply_buf, sizeof(reply_buf), NULL,
                                        request);
    if (r == -1)
      return false;

    Pickle reply(reinterpret_cast<char*>(reply_buf), r);
    void* iter = NULL;
    bool result;
    if (!reply.ReadBool(&iter, &result))
      return false;
    if (!result)
      return false;

    uint32_t reply_fileid;
    std::string reply_family;
    bool resulting_bold, resulting_italic;
    if (!reply.ReadUInt32(&iter, &reply_fileid) ||
        !reply.ReadString(&iter, &reply_family) ||
        !reply.ReadBool(&iter, &resulting_bold) ||
        !reply.ReadBool(&iter, &resulting_italic)) {
      return false;
    }

    *result_fileid = reply_fileid;
    if (result_family)
      *result_family = reply_family;

    if (is_bold)
      *is_bold = resulting_bold;
    if (is_italic)
      *is_italic = resulting_italic;

    return true;
}

int FontConfigIPC::Open(unsigned fileid) {
    Pickle request;
    request.WriteInt(METHOD_OPEN);
    request.WriteUInt32(fileid);

    int result_fd = -1;
    uint8_t reply_buf[256];
    const ssize_t r = base::SendRecvMsg(fd_, reply_buf, sizeof(reply_buf),
                                        &result_fd, request);

    if (r == -1)
      return -1;

    Pickle reply(reinterpret_cast<char*>(reply_buf), r);
    bool result;
    void* iter = NULL;
    if (!reply.ReadBool(&iter, &result) ||
        !result) {
      if (result_fd)
        close(result_fd);
      return -1;
    }

    return result_fd;
}