ipc/ipc_message_utils.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ipc/ipc_message_utils.h"
   6
   7 #include "base/files/file_path.h"
   8 #include "base/json/json_writer.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/nullable_string16.h"
  11 #include "base/string_number_conversions.h"
  12 #include "base/time.h"
  13 #include "base/utf_string_conversions.h"
  14 #include "base/values.h"
  15 #include "ipc/ipc_channel_handle.h"
  16
  17 #if defined(OS_POSIX)
  18 #include "ipc/file_descriptor_set_posix.h"
  19 #elif defined(OS_WIN)
  20 #include <tchar.h>
  21 #endif
  22
  23 namespace IPC {
  24
  25 namespace {
  26
  27 const int kMaxRecursionDepth = 100;
  28
  29 template<typename CharType>
  30 void LogBytes(const std::vector<CharType>& data, std::string* out) {
  31 #if defined(OS_WIN)
  32   // Windows has a GUI for logging, which can handle arbitrary binary data.
  33   for (size_t i = 0; i < data.size(); ++i)
  34     out->push_back(data[i]);
  35 #else
  36   // On POSIX, we log to stdout, which we assume can display ASCII.
  37   static const size_t kMaxBytesToLog = 100;
  38   for (size_t i = 0; i < std::min(data.size(), kMaxBytesToLog); ++i) {
  39     if (isprint(data[i]))
  40       out->push_back(data[i]);
  41     else
  42       out->append(
  43           base::StringPrintf("[%02X]", static_cast<unsigned char>(data[i])));
  44   }
  45   if (data.size() > kMaxBytesToLog) {
  46     out->append(base::StringPrintf(
  47         " and %u more bytes",
  48         static_cast<unsigned>(data.size() - kMaxBytesToLog)));
  49   }
  50 #endif
  51 }
  52
  53 bool ReadValue(const Message* m, PickleIterator* iter, Value** value,
  54                int recursion);
  55
  56 void WriteValue(Message* m, const Value* value, int recursion) {
  57   bool result;
  58   if (recursion > kMaxRecursionDepth) {
  59     LOG(WARNING) << "Max recursion depth hit in WriteValue.";
  60     return;
  61   }
  62
  63   m->WriteInt(value->GetType());
  64
  65   switch (value->GetType()) {
  66     case Value::TYPE_NULL:
  67     break;
  68     case Value::TYPE_BOOLEAN: {
  69       bool val;
  70       result = value->GetAsBoolean(&val);
  71       DCHECK(result);
  72       WriteParam(m, val);
  73       break;
  74     }
  75     case Value::TYPE_INTEGER: {
  76       int val;
  77       result = value->GetAsInteger(&val);
  78       DCHECK(result);
  79       WriteParam(m, val);
  80       break;
  81     }
  82     case Value::TYPE_DOUBLE: {
  83       double val;
  84       result = value->GetAsDouble(&val);
  85       DCHECK(result);
  86       WriteParam(m, val);
  87       break;
  88     }
  89     case Value::TYPE_STRING: {
  90       std::string val;
  91       result = value->GetAsString(&val);
  92       DCHECK(result);
  93       WriteParam(m, val);
  94       break;
  95     }
  96     case Value::TYPE_BINARY: {
  97       const base::BinaryValue* binary =
  98           static_cast<const base::BinaryValue*>(value);
  99       m->WriteData(binary->GetBuffer(), static_cast<int>(binary->GetSize()));
 100       break;
 101     }
 102     case Value::TYPE_DICTIONARY: {
 103       const DictionaryValue* dict = static_cast<const DictionaryValue*>(value);
 104
 105       WriteParam(m, static_cast<int>(dict->size()));
 106
 107       for (DictionaryValue::Iterator it(*dict); !it.IsAtEnd(); it.Advance()) {
 108         WriteParam(m, it.key());
 109         WriteValue(m, &it.value(), recursion + 1);
 110       }
 111       break;
 112     }
 113     case Value::TYPE_LIST: {
 114       const ListValue* list = static_cast<const ListValue*>(value);
 115       WriteParam(m, static_cast<int>(list->GetSize()));
 116       for (ListValue::const_iterator it = list->begin(); it != list->end();
 117            ++it) {
 118         WriteValue(m, *it, recursion + 1);
 119       }
 120       break;
 121     }
 122   }
 123 }
 124
 125 // Helper for ReadValue that reads a DictionaryValue into a pre-allocated
 126 // object.
 127 bool ReadDictionaryValue(const Message* m, PickleIterator* iter,
 128                          DictionaryValue* value, int recursion) {
 129   int size;
 130   if (!ReadParam(m, iter, &size))
 131     return false;
 132
 133   for (int i = 0; i < size; ++i) {
 134     std::string key;
 135     Value* subval;
 136     if (!ReadParam(m, iter, &key) ||
 137         !ReadValue(m, iter, &subval, recursion + 1))
 138       return false;
 139     value->SetWithoutPathExpansion(key, subval);
 140   }
 141
 142   return true;
 143 }
 144
 145 // Helper for ReadValue that reads a ReadListValue into a pre-allocated
 146 // object.
 147 bool ReadListValue(const Message* m, PickleIterator* iter,
 148                    ListValue* value, int recursion) {
 149   int size;
 150   if (!ReadParam(m, iter, &size))
 151     return false;
 152
 153   for (int i = 0; i < size; ++i) {
 154     Value* subval;
 155     if (!ReadValue(m, iter, &subval, recursion + 1))
 156       return false;
 157     value->Set(i, subval);
 158   }
 159
 160   return true;
 161 }
 162
 163 bool ReadValue(const Message* m, PickleIterator* iter, Value** value,
 164                int recursion) {
 165   if (recursion > kMaxRecursionDepth) {
 166     LOG(WARNING) << "Max recursion depth hit in ReadValue.";
 167     return false;
 168   }
 169
 170   int type;
 171   if (!ReadParam(m, iter, &type))
 172     return false;
 173
 174   switch (type) {
 175     case Value::TYPE_NULL:
 176     *value = Value::CreateNullValue();
 177     break;
 178     case Value::TYPE_BOOLEAN: {
 179       bool val;
 180       if (!ReadParam(m, iter, &val))
 181         return false;
 182       *value = new base::FundamentalValue(val);
 183       break;
 184     }
 185     case Value::TYPE_INTEGER: {
 186       int val;
 187       if (!ReadParam(m, iter, &val))
 188         return false;
 189       *value = new base::FundamentalValue(val);
 190       break;
 191     }
 192     case Value::TYPE_DOUBLE: {
 193       double val;
 194       if (!ReadParam(m, iter, &val))
 195         return false;
 196       *value = new base::FundamentalValue(val);
 197       break;
 198     }
 199     case Value::TYPE_STRING: {
 200       std::string val;
 201       if (!ReadParam(m, iter, &val))
 202         return false;
 203       *value = new base::StringValue(val);
 204       break;
 205     }
 206     case Value::TYPE_BINARY: {
 207       const char* data;
 208       int length;
 209       if (!m->ReadData(iter, &data, &length))
 210         return false;
 211       *value = base::BinaryValue::CreateWithCopiedBuffer(data, length);
 212       break;
 213     }
 214     case Value::TYPE_DICTIONARY: {
 215       scoped_ptr<DictionaryValue> val(new DictionaryValue());
 216       if (!ReadDictionaryValue(m, iter, val.get(), recursion))
 217         return false;
 218       *value = val.release();
 219       break;
 220     }
 221     case Value::TYPE_LIST: {
 222       scoped_ptr<ListValue> val(new ListValue());
 223       if (!ReadListValue(m, iter, val.get(), recursion))
 224         return false;
 225       *value = val.release();
 226       break;
 227     }
 228     default:
 229     return false;
 230   }
 231
 232   return true;
 233 }
 234
 235 }  // namespace
 236
 237 // -----------------------------------------------------------------------------
 238
 239 LogData::LogData()
 240     : routing_id(0),
 241       type(0),
 242       sent(0),
 243       receive(0),
 244       dispatch(0) {
 245 }
 246
 247 LogData::~LogData() {
 248 }
 249
 250 void ParamTraits<bool>::Log(const param_type& p, std::string* l) {
 251   l->append(p ? "true" : "false");
 252 }
 253
 254 void ParamTraits<int>::Log(const param_type& p, std::string* l) {
 255   l->append(base::IntToString(p));
 256 }
 257
 258 void ParamTraits<unsigned int>::Log(const param_type& p, std::string* l) {
 259   l->append(base::UintToString(p));
 260 }
 261
 262 void ParamTraits<long>::Log(const param_type& p, std::string* l) {
 263   l->append(base::Int64ToString(static_cast<int64>(p)));
 264 }
 265
 266 void ParamTraits<unsigned long>::Log(const param_type& p, std::string* l) {
 267   l->append(base::Uint64ToString(static_cast<uint64>(p)));
 268 }
 269
 270 void ParamTraits<long long>::Log(const param_type& p, std::string* l) {
 271   l->append(base::Int64ToString(static_cast<int64>(p)));
 272 }
 273
 274 void ParamTraits<unsigned long long>::Log(const param_type& p, std::string* l) {
 275   l->append(base::Uint64ToString(p));
 276 }
 277
 278 void ParamTraits<unsigned short>::Write(Message* m, const param_type& p) {
 279   m->WriteBytes(&p, sizeof(param_type));
 280 }
 281
 282 bool ParamTraits<unsigned short>::Read(const Message* m, PickleIterator* iter,
 283                                        param_type* r) {
 284   const char* data;
 285   if (!m->ReadBytes(iter, &data, sizeof(param_type)))
 286     return false;
 287   memcpy(r, data, sizeof(param_type));
 288   return true;
 289 }
 290
 291 void ParamTraits<unsigned short>::Log(const param_type& p, std::string* l) {
 292   l->append(base::UintToString(p));
 293 }
 294
 295 void ParamTraits<float>::Write(Message* m, const param_type& p) {
 296   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(param_type));
 297 }
 298
 299 bool ParamTraits<float>::Read(const Message* m, PickleIterator* iter,
 300                               param_type* r) {
 301   const char *data;
 302   int data_size;
 303   if (!m->ReadData(iter, &data, &data_size) ||
 304       data_size != sizeof(param_type)) {
 305     NOTREACHED();
 306     return false;
 307   }
 308   memcpy(r, data, sizeof(param_type));
 309   return true;
 310 }
 311
 312 void ParamTraits<float>::Log(const param_type& p, std::string* l) {
 313   l->append(base::StringPrintf("%e", p));
 314 }
 315
 316 void ParamTraits<double>::Write(Message* m, const param_type& p) {
 317   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(param_type));
 318 }
 319
 320 bool ParamTraits<double>::Read(const Message* m, PickleIterator* iter,
 321                                param_type* r) {
 322   const char *data;
 323   int data_size;
 324   if (!m->ReadData(iter, &data, &data_size) ||
 325       data_size != sizeof(param_type)) {
 326     NOTREACHED();
 327     return false;
 328   }
 329   memcpy(r, data, sizeof(param_type));
 330   return true;
 331 }
 332
 333 void ParamTraits<double>::Log(const param_type& p, std::string* l) {
 334   l->append(base::StringPrintf("%e", p));
 335 }
 336
 337
 338 void ParamTraits<std::string>::Log(const param_type& p, std::string* l) {
 339   l->append(p);
 340 }
 341
 342 void ParamTraits<std::wstring>::Log(const param_type& p, std::string* l) {
 343   l->append(WideToUTF8(p));
 344 }
 345
 346 #if !defined(WCHAR_T_IS_UTF16)
 347 void ParamTraits<string16>::Log(const param_type& p, std::string* l) {
 348   l->append(UTF16ToUTF8(p));
 349 }
 350 #endif
 351
 352 void ParamTraits<std::vector<char> >::Write(Message* m, const param_type& p) {
 353   if (p.empty()) {
 354     m->WriteData(NULL, 0);
 355   } else {
 356     m->WriteData(&p.front(), static_cast<int>(p.size()));
 357   }
 358 }
 359
 360 bool ParamTraits<std::vector<char> >::Read(const Message* m,
 361                                            PickleIterator* iter,
 362                                            param_type* r) {
 363   const char *data;
 364   int data_size = 0;
 365   if (!m->ReadData(iter, &data, &data_size) || data_size < 0)
 366     return false;
 367   r->resize(data_size);
 368   if (data_size)
 369     memcpy(&r->front(), data, data_size);
 370   return true;
 371 }
 372
 373 void ParamTraits<std::vector<char> >::Log(const param_type& p, std::string* l) {
 374   LogBytes(p, l);
 375 }
 376
 377 void ParamTraits<std::vector<unsigned char> >::Write(Message* m,
 378                                                      const param_type& p) {
 379   if (p.empty()) {
 380     m->WriteData(NULL, 0);
 381   } else {
 382     m->WriteData(reinterpret_cast<const char*>(&p.front()),
 383                  static_cast<int>(p.size()));
 384   }
 385 }
 386
 387 bool ParamTraits<std::vector<unsigned char> >::Read(const Message* m,
 388                                                     PickleIterator* iter,
 389                                                     param_type* r) {
 390   const char *data;
 391   int data_size = 0;
 392   if (!m->ReadData(iter, &data, &data_size) || data_size < 0)
 393     return false;
 394   r->resize(data_size);
 395   if (data_size)
 396     memcpy(&r->front(), data, data_size);
 397   return true;
 398 }
 399
 400 void ParamTraits<std::vector<unsigned char> >::Log(const param_type& p,
 401                                                    std::string* l) {
 402   LogBytes(p, l);
 403 }
 404
 405 void ParamTraits<std::vector<bool> >::Write(Message* m, const param_type& p) {
 406   WriteParam(m, static_cast<int>(p.size()));
 407   // Cast to bool below is required because libc++'s
 408   // vector<bool>::const_reference is different from bool, and we want to avoid
 409   // writing an extra specialization of ParamTraits for it.
 410   for (size_t i = 0; i < p.size(); i++)
 411     WriteParam(m, static_cast<bool>(p[i]));
 412 }
 413
 414 bool ParamTraits<std::vector<bool> >::Read(const Message* m,
 415                                            PickleIterator* iter,
 416                                            param_type* r) {
 417   int size;
 418   // ReadLength() checks for < 0 itself.
 419   if (!m->ReadLength(iter, &size))
 420     return false;
 421   r->resize(size);
 422   for (int i = 0; i < size; i++) {
 423     bool value;
 424     if (!ReadParam(m, iter, &value))
 425       return false;
 426     (*r)[i] = value;
 427   }
 428   return true;
 429 }
 430
 431 void ParamTraits<std::vector<bool> >::Log(const param_type& p, std::string* l) {
 432   for (size_t i = 0; i < p.size(); ++i) {
 433     if (i != 0)
 434       l->push_back(' ');
 435     LogParam(static_cast<bool>(p[i]), l);
 436   }
 437 }
 438
 439 void ParamTraits<DictionaryValue>::Write(Message* m, const param_type& p) {
 440   WriteValue(m, &p, 0);
 441 }
 442
 443 bool ParamTraits<DictionaryValue>::Read(
 444     const Message* m, PickleIterator* iter, param_type* r) {
 445   int type;
 446   if (!ReadParam(m, iter, &type) || type != Value::TYPE_DICTIONARY)
 447     return false;
 448
 449   return ReadDictionaryValue(m, iter, r, 0);
 450 }
 451
 452 void ParamTraits<DictionaryValue>::Log(const param_type& p, std::string* l) {
 453   std::string json;
 454   base::JSONWriter::Write(&p, &json);
 455   l->append(json);
 456 }
 457
 458 #if defined(OS_POSIX)
 459 void ParamTraits<base::FileDescriptor>::Write(Message* m, const param_type& p) {
 460   const bool valid = p.fd >= 0;
 461   WriteParam(m, valid);
 462
 463   if (valid) {
 464     if (!m->WriteFileDescriptor(p))
 465       NOTREACHED();
 466   }
 467 }
 468
 469 bool ParamTraits<base::FileDescriptor>::Read(const Message* m,
 470                                              PickleIterator* iter,
 471                                              param_type* r) {
 472   bool valid;
 473   if (!ReadParam(m, iter, &valid))
 474     return false;
 475
 476   if (!valid) {
 477     r->fd = -1;
 478     r->auto_close = false;
 479     return true;
 480   }
 481
 482   return m->ReadFileDescriptor(iter, r);
 483 }
 484
 485 void ParamTraits<base::FileDescriptor>::Log(const param_type& p,
 486                                             std::string* l) {
 487   if (p.auto_close) {
 488     l->append(base::StringPrintf("FD(%d auto-close)", p.fd));
 489   } else {
 490     l->append(base::StringPrintf("FD(%d)", p.fd));
 491   }
 492 }
 493 #endif  // defined(OS_POSIX)
 494
 495 void ParamTraits<base::FilePath>::Write(Message* m, const param_type& p) {
 496   p.WriteToPickle(m);
 497 }
 498
 499 bool ParamTraits<base::FilePath>::Read(const Message* m,
 500                                        PickleIterator* iter,
 501                                        param_type* r) {
 502   return r->ReadFromPickle(iter);
 503 }
 504
 505 void ParamTraits<base::FilePath>::Log(const param_type& p, std::string* l) {
 506   ParamTraits<base::FilePath::StringType>::Log(p.value(), l);
 507 }
 508
 509 void ParamTraits<ListValue>::Write(Message* m, const param_type& p) {
 510   WriteValue(m, &p, 0);
 511 }
 512
 513 bool ParamTraits<ListValue>::Read(
 514     const Message* m, PickleIterator* iter, param_type* r) {
 515   int type;
 516   if (!ReadParam(m, iter, &type) || type != Value::TYPE_LIST)
 517     return false;
 518
 519   return ReadListValue(m, iter, r, 0);
 520 }
 521
 522 void ParamTraits<ListValue>::Log(const param_type& p, std::string* l) {
 523   std::string json;
 524   base::JSONWriter::Write(&p, &json);
 525   l->append(json);
 526 }
 527
 528 void ParamTraits<NullableString16>::Write(Message* m, const param_type& p) {
 529   WriteParam(m, p.string());
 530   WriteParam(m, p.is_null());
 531 }
 532
 533 bool ParamTraits<NullableString16>::Read(const Message* m, PickleIterator* iter,
 534                                          param_type* r) {
 535   string16 string;
 536   if (!ReadParam(m, iter, &string))
 537     return false;
 538   bool is_null;
 539   if (!ReadParam(m, iter, &is_null))
 540     return false;
 541   *r = NullableString16(string, is_null);
 542   return true;
 543 }
 544
 545 void ParamTraits<NullableString16>::Log(const param_type& p, std::string* l) {
 546   l->append("(");
 547   LogParam(p.string(), l);
 548   l->append(", ");
 549   LogParam(p.is_null(), l);
 550   l->append(")");
 551 }
 552
 553 void ParamTraits<base::PlatformFileInfo>::Write(Message* m,
 554                                                 const param_type& p) {
 555   WriteParam(m, p.size);
 556   WriteParam(m, p.is_directory);
 557   WriteParam(m, p.last_modified.ToDoubleT());
 558   WriteParam(m, p.last_accessed.ToDoubleT());
 559   WriteParam(m, p.creation_time.ToDoubleT());
 560 }
 561
 562 bool ParamTraits<base::PlatformFileInfo>::Read(const Message* m,
 563                                                PickleIterator* iter,
 564                                                param_type* p) {
 565   double last_modified;
 566   double last_accessed;
 567   double creation_time;
 568   bool result =
 569       ReadParam(m, iter, &p->size) &&
 570       ReadParam(m, iter, &p->is_directory) &&
 571       ReadParam(m, iter, &last_modified) &&
 572       ReadParam(m, iter, &last_accessed) &&
 573       ReadParam(m, iter, &creation_time);
 574   if (result) {
 575     p->last_modified = base::Time::FromDoubleT(last_modified);
 576     p->last_accessed = base::Time::FromDoubleT(last_accessed);
 577     p->creation_time = base::Time::FromDoubleT(creation_time);
 578   }
 579   return result;
 580 }
 581
 582 void ParamTraits<base::PlatformFileInfo>::Log(const param_type& p,
 583                                               std::string* l) {
 584   l->append("(");
 585   LogParam(p.size, l);
 586   l->append(",");
 587   LogParam(p.is_directory, l);
 588   l->append(",");
 589   LogParam(p.last_modified.ToDoubleT(), l);
 590   l->append(",");
 591   LogParam(p.last_accessed.ToDoubleT(), l);
 592   l->append(",");
 593   LogParam(p.creation_time.ToDoubleT(), l);
 594   l->append(")");
 595 }
 596
 597 void ParamTraits<base::Time>::Write(Message* m, const param_type& p) {
 598   ParamTraits<int64>::Write(m, p.ToInternalValue());
 599 }
 600
 601 bool ParamTraits<base::Time>::Read(const Message* m, PickleIterator* iter,
 602                                    param_type* r) {
 603   int64 value;
 604   if (!ParamTraits<int64>::Read(m, iter, &value))
 605     return false;
 606   *r = base::Time::FromInternalValue(value);
 607   return true;
 608 }
 609
 610 void ParamTraits<base::Time>::Log(const param_type& p, std::string* l) {
 611   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 612 }
 613
 614 void ParamTraits<base::TimeDelta>::Write(Message* m, const param_type& p) {
 615   ParamTraits<int64>::Write(m, p.ToInternalValue());
 616 }
 617
 618 bool ParamTraits<base::TimeDelta>::Read(const Message* m,
 619                                         PickleIterator* iter,
 620                                         param_type* r) {
 621   int64 value;
 622   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 623   if (ret)
 624     *r = base::TimeDelta::FromInternalValue(value);
 625
 626   return ret;
 627 }
 628
 629 void ParamTraits<base::TimeDelta>::Log(const param_type& p, std::string* l) {
 630   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 631 }
 632
 633 void ParamTraits<base::TimeTicks>::Write(Message* m, const param_type& p) {
 634   ParamTraits<int64>::Write(m, p.ToInternalValue());
 635 }
 636
 637 bool ParamTraits<base::TimeTicks>::Read(const Message* m,
 638                                         PickleIterator* iter,
 639                                         param_type* r) {
 640   int64 value;
 641   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 642   if (ret)
 643     *r = base::TimeTicks::FromInternalValue(value);
 644
 645   return ret;
 646 }
 647
 648 void ParamTraits<base::TimeTicks>::Log(const param_type& p, std::string* l) {
 649   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 650 }
 651
 652 void ParamTraits<IPC::ChannelHandle>::Write(Message* m, const param_type& p) {
 653 #if defined(OS_WIN)
 654   // On Windows marshalling pipe handle is not supported.
 655   DCHECK(p.pipe.handle == NULL);
 656 #endif  // defined (OS_WIN)
 657   WriteParam(m, p.name);
 658 #if defined(OS_POSIX)
 659   WriteParam(m, p.socket);
 660 #endif
 661 }
 662
 663 bool ParamTraits<IPC::ChannelHandle>::Read(const Message* m,
 664                                            PickleIterator* iter,
 665                                            param_type* r) {
 666   return ReadParam(m, iter, &r->name)
 667 #if defined(OS_POSIX)
 668       && ReadParam(m, iter, &r->socket)
 669 #endif
 670       ;
 671 }
 672
 673 void ParamTraits<IPC::ChannelHandle>::Log(const param_type& p,
 674                                           std::string* l) {
 675   l->append(base::StringPrintf("ChannelHandle(%s", p.name.c_str()));
 676 #if defined(OS_POSIX)
 677   l->append(", ");
 678   ParamTraits<base::FileDescriptor>::Log(p.socket, l);
 679 #endif
 680   l->append(")");
 681 }
 682
 683 void ParamTraits<LogData>::Write(Message* m, const param_type& p) {
 684   WriteParam(m, p.channel);
 685   WriteParam(m, p.routing_id);
 686   WriteParam(m, p.type);
 687   WriteParam(m, p.flags);
 688   WriteParam(m, p.sent);
 689   WriteParam(m, p.receive);
 690   WriteParam(m, p.dispatch);
 691   WriteParam(m, p.message_name);
 692   WriteParam(m, p.params);
 693 }
 694
 695 bool ParamTraits<LogData>::Read(const Message* m,
 696                                 PickleIterator* iter,
 697                                 param_type* r) {
 698   return
 699       ReadParam(m, iter, &r->channel) &&
 700       ReadParam(m, iter, &r->routing_id) &&
 701       ReadParam(m, iter, &r->type) &&
 702       ReadParam(m, iter, &r->flags) &&
 703       ReadParam(m, iter, &r->sent) &&
 704       ReadParam(m, iter, &r->receive) &&
 705       ReadParam(m, iter, &r->dispatch) &&
 706       ReadParam(m, iter, &r->message_name) &&
 707       ReadParam(m, iter, &r->params);
 708 }
 709
 710 void ParamTraits<LogData>::Log(const param_type& p, std::string* l) {
 711   // Doesn't make sense to implement this!
 712 }
 713
 714 void ParamTraits<Message>::Write(Message* m, const Message& p) {
 715 #if defined(OS_POSIX)
 716   // We don't serialize the file descriptors in the nested message, so there
 717   // better not be any.
 718   DCHECK(!p.HasFileDescriptors());
 719 #endif
 720
 721   // Don't just write out the message. This is used to send messages between
 722   // NaCl (Posix environment) and the browser (could be on Windows). The message
 723   // header formats differ between these systems (so does handle sharing, but
 724   // we already asserted we don't have any handles). So just write out the
 725   // parts of the header we use.
 726   //
 727   // Be careful also to use only explicitly-sized types. The NaCl environment
 728   // could be 64-bit and the host browser could be 32-bits. The nested message
 729   // may or may not be safe to send between 32-bit and 64-bit systems, but we
 730   // leave that up to the code sending the message to ensure.
 731   m->WriteUInt32(static_cast<uint32>(p.routing_id()));
 732   m->WriteUInt32(p.type());
 733   m->WriteUInt32(p.flags());
 734   m->WriteData(p.payload(), static_cast<uint32>(p.payload_size()));
 735 }
 736
 737 bool ParamTraits<Message>::Read(const Message* m, PickleIterator* iter,
 738                                 Message* r) {
 739   uint32 routing_id, type, flags;
 740   if (!m->ReadUInt32(iter, &routing_id) ||
 741       !m->ReadUInt32(iter, &type) ||
 742       !m->ReadUInt32(iter, &flags))
 743     return false;
 744
 745   int payload_size;
 746   const char* payload;
 747   if (!m->ReadData(iter, &payload, &payload_size))
 748     return false;
 749
 750   r->SetHeaderValues(static_cast<int32>(routing_id), type, flags);
 751   return r->WriteBytes(payload, payload_size);
 752 }
 753
 754 void ParamTraits<Message>::Log(const Message& p, std::string* l) {
 755   l->append("<IPC::Message>");
 756 }
 757
 758 #if defined(OS_WIN)
 759 // Note that HWNDs/HANDLE/HCURSOR/HACCEL etc are always 32 bits, even on 64
 760 // bit systems. That's why we use the Windows macros to convert to 32 bits.
 761 void ParamTraits<HANDLE>::Write(Message* m, const param_type& p) {
 762   m->WriteInt(HandleToLong(p));
 763 }
 764
 765 bool ParamTraits<HANDLE>::Read(const Message* m, PickleIterator* iter,
 766                                param_type* r) {
 767   int32 temp;
 768   if (!m->ReadInt(iter, &temp))
 769     return false;
 770   *r = LongToHandle(temp);
 771   return true;
 772 }
 773
 774 void ParamTraits<HANDLE>::Log(const param_type& p, std::string* l) {
 775   l->append(base::StringPrintf("0x%X", p));
 776 }
 777
 778 void ParamTraits<LOGFONT>::Write(Message* m, const param_type& p) {
 779   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(LOGFONT));
 780 }
 781
 782 bool ParamTraits<LOGFONT>::Read(const Message* m, PickleIterator* iter,
 783                                 param_type* r) {
 784   const char *data;
 785   int data_size = 0;
 786   if (m->ReadData(iter, &data, &data_size) && data_size == sizeof(LOGFONT)) {
 787     const LOGFONT *font = reinterpret_cast<LOGFONT*>(const_cast<char*>(data));
 788     if (_tcsnlen(font->lfFaceName, LF_FACESIZE) < LF_FACESIZE) {
 789       memcpy(r, data, sizeof(LOGFONT));
 790       return true;
 791     }
 792   }
 793
 794   NOTREACHED();
 795   return false;
 796 }
 797
 798 void ParamTraits<LOGFONT>::Log(const param_type& p, std::string* l) {
 799   l->append(base::StringPrintf("<LOGFONT>"));
 800 }
 801
 802 void ParamTraits<MSG>::Write(Message* m, const param_type& p) {
 803   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(MSG));
 804 }
 805
 806 bool ParamTraits<MSG>::Read(const Message* m, PickleIterator* iter,
 807                             param_type* r) {
 808   const char *data;
 809   int data_size = 0;
 810   bool result = m->ReadData(iter, &data, &data_size);
 811   if (result && data_size == sizeof(MSG)) {
 812     memcpy(r, data, sizeof(MSG));
 813   } else {
 814     result = false;
 815     NOTREACHED();
 816   }
 817
 818   return result;
 819 }
 820
 821 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
 822   l->append("<MSG>");
 823 }
 824
 825 #endif  // OS_WIN
 826
 827 }  // namespace IPC