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/strings/nullable_string16.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/utf_string_conversions.h"
  13 #include "base/time/time.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, base::Value** value,
  54                int recursion);
  55
  56 void WriteValue(Message* m, const base::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 base::Value::TYPE_NULL:
  67     break;
  68     case base::Value::TYPE_BOOLEAN: {
  69       bool val;
  70       result = value->GetAsBoolean(&val);
  71       DCHECK(result);
  72       WriteParam(m, val);
  73       break;
  74     }
  75     case base::Value::TYPE_INTEGER: {
  76       int val;
  77       result = value->GetAsInteger(&val);
  78       DCHECK(result);
  79       WriteParam(m, val);
  80       break;
  81     }
  82     case base::Value::TYPE_DOUBLE: {
  83       double val;
  84       result = value->GetAsDouble(&val);
  85       DCHECK(result);
  86       WriteParam(m, val);
  87       break;
  88     }
  89     case base::Value::TYPE_STRING: {
  90       std::string val;
  91       result = value->GetAsString(&val);
  92       DCHECK(result);
  93       WriteParam(m, val);
  94       break;
  95     }
  96     case base::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 base::Value::TYPE_DICTIONARY: {
 103       const base::DictionaryValue* dict =
 104           static_cast<const base::DictionaryValue*>(value);
 105
 106       WriteParam(m, static_cast<int>(dict->size()));
 107
 108       for (base::DictionaryValue::Iterator it(*dict); !it.IsAtEnd();
 109            it.Advance()) {
 110         WriteParam(m, it.key());
 111         WriteValue(m, &it.value(), recursion + 1);
 112       }
 113       break;
 114     }
 115     case base::Value::TYPE_LIST: {
 116       const base::ListValue* list = static_cast<const base::ListValue*>(value);
 117       WriteParam(m, static_cast<int>(list->GetSize()));
 118       for (base::ListValue::const_iterator it = list->begin();
 119            it != list->end(); ++it) {
 120         WriteValue(m, *it, recursion + 1);
 121       }
 122       break;
 123     }
 124   }
 125 }
 126
 127 // Helper for ReadValue that reads a DictionaryValue into a pre-allocated
 128 // object.
 129 bool ReadDictionaryValue(const Message* m, PickleIterator* iter,
 130                          base::DictionaryValue* value, int recursion) {
 131   int size;
 132   if (!ReadParam(m, iter, &size))
 133     return false;
 134
 135   for (int i = 0; i < size; ++i) {
 136     std::string key;
 137     base::Value* subval;
 138     if (!ReadParam(m, iter, &key) ||
 139         !ReadValue(m, iter, &subval, recursion + 1))
 140       return false;
 141     value->SetWithoutPathExpansion(key, subval);
 142   }
 143
 144   return true;
 145 }
 146
 147 // Helper for ReadValue that reads a ReadListValue into a pre-allocated
 148 // object.
 149 bool ReadListValue(const Message* m, PickleIterator* iter,
 150                    base::ListValue* value, int recursion) {
 151   int size;
 152   if (!ReadParam(m, iter, &size))
 153     return false;
 154
 155   for (int i = 0; i < size; ++i) {
 156     base::Value* subval;
 157     if (!ReadValue(m, iter, &subval, recursion + 1))
 158       return false;
 159     value->Set(i, subval);
 160   }
 161
 162   return true;
 163 }
 164
 165 bool ReadValue(const Message* m, PickleIterator* iter, base::Value** value,
 166                int recursion) {
 167   if (recursion > kMaxRecursionDepth) {
 168     LOG(WARNING) << "Max recursion depth hit in ReadValue.";
 169     return false;
 170   }
 171
 172   int type;
 173   if (!ReadParam(m, iter, &type))
 174     return false;
 175
 176   switch (type) {
 177     case base::Value::TYPE_NULL:
 178     *value = base::Value::CreateNullValue();
 179     break;
 180     case base::Value::TYPE_BOOLEAN: {
 181       bool val;
 182       if (!ReadParam(m, iter, &val))
 183         return false;
 184       *value = new base::FundamentalValue(val);
 185       break;
 186     }
 187     case base::Value::TYPE_INTEGER: {
 188       int val;
 189       if (!ReadParam(m, iter, &val))
 190         return false;
 191       *value = new base::FundamentalValue(val);
 192       break;
 193     }
 194     case base::Value::TYPE_DOUBLE: {
 195       double val;
 196       if (!ReadParam(m, iter, &val))
 197         return false;
 198       *value = new base::FundamentalValue(val);
 199       break;
 200     }
 201     case base::Value::TYPE_STRING: {
 202       std::string val;
 203       if (!ReadParam(m, iter, &val))
 204         return false;
 205       *value = new base::StringValue(val);
 206       break;
 207     }
 208     case base::Value::TYPE_BINARY: {
 209       const char* data;
 210       int length;
 211       if (!m->ReadData(iter, &data, &length))
 212         return false;
 213       *value = base::BinaryValue::CreateWithCopiedBuffer(data, length);
 214       break;
 215     }
 216     case base::Value::TYPE_DICTIONARY: {
 217       scoped_ptr<base::DictionaryValue> val(new base::DictionaryValue());
 218       if (!ReadDictionaryValue(m, iter, val.get(), recursion))
 219         return false;
 220       *value = val.release();
 221       break;
 222     }
 223     case base::Value::TYPE_LIST: {
 224       scoped_ptr<base::ListValue> val(new base::ListValue());
 225       if (!ReadListValue(m, iter, val.get(), recursion))
 226         return false;
 227       *value = val.release();
 228       break;
 229     }
 230     default:
 231     return false;
 232   }
 233
 234   return true;
 235 }
 236
 237 }  // namespace
 238
 239 // -----------------------------------------------------------------------------
 240
 241 LogData::LogData()
 242     : routing_id(0),
 243       type(0),
 244       sent(0),
 245       receive(0),
 246       dispatch(0) {
 247 }
 248
 249 LogData::~LogData() {
 250 }
 251
 252 void ParamTraits<bool>::Log(const param_type& p, std::string* l) {
 253   l->append(p ? "true" : "false");
 254 }
 255
 256 void ParamTraits<int>::Log(const param_type& p, std::string* l) {
 257   l->append(base::IntToString(p));
 258 }
 259
 260 void ParamTraits<unsigned int>::Log(const param_type& p, std::string* l) {
 261   l->append(base::UintToString(p));
 262 }
 263
 264 void ParamTraits<long>::Log(const param_type& p, std::string* l) {
 265   l->append(base::Int64ToString(static_cast<int64>(p)));
 266 }
 267
 268 void ParamTraits<unsigned long>::Log(const param_type& p, std::string* l) {
 269   l->append(base::Uint64ToString(static_cast<uint64>(p)));
 270 }
 271
 272 void ParamTraits<long long>::Log(const param_type& p, std::string* l) {
 273   l->append(base::Int64ToString(static_cast<int64>(p)));
 274 }
 275
 276 void ParamTraits<unsigned long long>::Log(const param_type& p, std::string* l) {
 277   l->append(base::Uint64ToString(p));
 278 }
 279
 280 void ParamTraits<unsigned short>::Write(Message* m, const param_type& p) {
 281   m->WriteBytes(&p, sizeof(param_type));
 282 }
 283
 284 bool ParamTraits<unsigned short>::Read(const Message* m, PickleIterator* iter,
 285                                        param_type* r) {
 286   const char* data;
 287   if (!m->ReadBytes(iter, &data, sizeof(param_type)))
 288     return false;
 289   memcpy(r, data, sizeof(param_type));
 290   return true;
 291 }
 292
 293 void ParamTraits<unsigned short>::Log(const param_type& p, std::string* l) {
 294   l->append(base::UintToString(p));
 295 }
 296
 297 void ParamTraits<float>::Write(Message* m, const param_type& p) {
 298   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(param_type));
 299 }
 300
 301 bool ParamTraits<float>::Read(const Message* m, PickleIterator* iter,
 302                               param_type* r) {
 303   const char *data;
 304   int data_size;
 305   if (!m->ReadData(iter, &data, &data_size) ||
 306       data_size != sizeof(param_type)) {
 307     NOTREACHED();
 308     return false;
 309   }
 310   memcpy(r, data, sizeof(param_type));
 311   return true;
 312 }
 313
 314 void ParamTraits<float>::Log(const param_type& p, std::string* l) {
 315   l->append(base::StringPrintf("%e", p));
 316 }
 317
 318 void ParamTraits<double>::Write(Message* m, const param_type& p) {
 319   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(param_type));
 320 }
 321
 322 bool ParamTraits<double>::Read(const Message* m, PickleIterator* iter,
 323                                param_type* r) {
 324   const char *data;
 325   int data_size;
 326   if (!m->ReadData(iter, &data, &data_size) ||
 327       data_size != sizeof(param_type)) {
 328     NOTREACHED();
 329     return false;
 330   }
 331   memcpy(r, data, sizeof(param_type));
 332   return true;
 333 }
 334
 335 void ParamTraits<double>::Log(const param_type& p, std::string* l) {
 336   l->append(base::StringPrintf("%e", p));
 337 }
 338
 339
 340 void ParamTraits<std::string>::Log(const param_type& p, std::string* l) {
 341   l->append(p);
 342 }
 343
 344 void ParamTraits<std::wstring>::Log(const param_type& p, std::string* l) {
 345   l->append(WideToUTF8(p));
 346 }
 347
 348 #if !defined(WCHAR_T_IS_UTF16)
 349 void ParamTraits<string16>::Log(const param_type& p, std::string* l) {
 350   l->append(UTF16ToUTF8(p));
 351 }
 352 #endif
 353
 354 void ParamTraits<std::vector<char> >::Write(Message* m, const param_type& p) {
 355   if (p.empty()) {
 356     m->WriteData(NULL, 0);
 357   } else {
 358     m->WriteData(&p.front(), static_cast<int>(p.size()));
 359   }
 360 }
 361
 362 bool ParamTraits<std::vector<char> >::Read(const Message* m,
 363                                            PickleIterator* iter,
 364                                            param_type* r) {
 365   const char *data;
 366   int data_size = 0;
 367   if (!m->ReadData(iter, &data, &data_size) || data_size < 0)
 368     return false;
 369   r->resize(data_size);
 370   if (data_size)
 371     memcpy(&r->front(), data, data_size);
 372   return true;
 373 }
 374
 375 void ParamTraits<std::vector<char> >::Log(const param_type& p, std::string* l) {
 376   LogBytes(p, l);
 377 }
 378
 379 void ParamTraits<std::vector<unsigned char> >::Write(Message* m,
 380                                                      const param_type& p) {
 381   if (p.empty()) {
 382     m->WriteData(NULL, 0);
 383   } else {
 384     m->WriteData(reinterpret_cast<const char*>(&p.front()),
 385                  static_cast<int>(p.size()));
 386   }
 387 }
 388
 389 bool ParamTraits<std::vector<unsigned char> >::Read(const Message* m,
 390                                                     PickleIterator* iter,
 391                                                     param_type* r) {
 392   const char *data;
 393   int data_size = 0;
 394   if (!m->ReadData(iter, &data, &data_size) || data_size < 0)
 395     return false;
 396   r->resize(data_size);
 397   if (data_size)
 398     memcpy(&r->front(), data, data_size);
 399   return true;
 400 }
 401
 402 void ParamTraits<std::vector<unsigned char> >::Log(const param_type& p,
 403                                                    std::string* l) {
 404   LogBytes(p, l);
 405 }
 406
 407 void ParamTraits<std::vector<bool> >::Write(Message* m, const param_type& p) {
 408   WriteParam(m, static_cast<int>(p.size()));
 409   // Cast to bool below is required because libc++'s
 410   // vector<bool>::const_reference is different from bool, and we want to avoid
 411   // writing an extra specialization of ParamTraits for it.
 412   for (size_t i = 0; i < p.size(); i++)
 413     WriteParam(m, static_cast<bool>(p[i]));
 414 }
 415
 416 bool ParamTraits<std::vector<bool> >::Read(const Message* m,
 417                                            PickleIterator* iter,
 418                                            param_type* r) {
 419   int size;
 420   // ReadLength() checks for < 0 itself.
 421   if (!m->ReadLength(iter, &size))
 422     return false;
 423   r->resize(size);
 424   for (int i = 0; i < size; i++) {
 425     bool value;
 426     if (!ReadParam(m, iter, &value))
 427       return false;
 428     (*r)[i] = value;
 429   }
 430   return true;
 431 }
 432
 433 void ParamTraits<std::vector<bool> >::Log(const param_type& p, std::string* l) {
 434   for (size_t i = 0; i < p.size(); ++i) {
 435     if (i != 0)
 436       l->push_back(' ');
 437     LogParam(static_cast<bool>(p[i]), l);
 438   }
 439 }
 440
 441 void ParamTraits<base::DictionaryValue>::Write(Message* m,
 442                                                const param_type& p) {
 443   WriteValue(m, &p, 0);
 444 }
 445
 446 bool ParamTraits<base::DictionaryValue>::Read(
 447     const Message* m, PickleIterator* iter, param_type* r) {
 448   int type;
 449   if (!ReadParam(m, iter, &type) || type != base::Value::TYPE_DICTIONARY)
 450     return false;
 451
 452   return ReadDictionaryValue(m, iter, r, 0);
 453 }
 454
 455 void ParamTraits<base::DictionaryValue>::Log(const param_type& p,
 456                                              std::string* l) {
 457   std::string json;
 458   base::JSONWriter::Write(&p, &json);
 459   l->append(json);
 460 }
 461
 462 #if defined(OS_POSIX)
 463 void ParamTraits<base::FileDescriptor>::Write(Message* m, const param_type& p) {
 464   const bool valid = p.fd >= 0;
 465   WriteParam(m, valid);
 466
 467   if (valid) {
 468     if (!m->WriteFileDescriptor(p))
 469       NOTREACHED();
 470   }
 471 }
 472
 473 bool ParamTraits<base::FileDescriptor>::Read(const Message* m,
 474                                              PickleIterator* iter,
 475                                              param_type* r) {
 476   bool valid;
 477   if (!ReadParam(m, iter, &valid))
 478     return false;
 479
 480   if (!valid) {
 481     r->fd = -1;
 482     r->auto_close = false;
 483     return true;
 484   }
 485
 486   return m->ReadFileDescriptor(iter, r);
 487 }
 488
 489 void ParamTraits<base::FileDescriptor>::Log(const param_type& p,
 490                                             std::string* l) {
 491   if (p.auto_close) {
 492     l->append(base::StringPrintf("FD(%d auto-close)", p.fd));
 493   } else {
 494     l->append(base::StringPrintf("FD(%d)", p.fd));
 495   }
 496 }
 497 #endif  // defined(OS_POSIX)
 498
 499 void ParamTraits<base::FilePath>::Write(Message* m, const param_type& p) {
 500   p.WriteToPickle(m);
 501 }
 502
 503 bool ParamTraits<base::FilePath>::Read(const Message* m,
 504                                        PickleIterator* iter,
 505                                        param_type* r) {
 506   return r->ReadFromPickle(iter);
 507 }
 508
 509 void ParamTraits<base::FilePath>::Log(const param_type& p, std::string* l) {
 510   ParamTraits<base::FilePath::StringType>::Log(p.value(), l);
 511 }
 512
 513 void ParamTraits<base::ListValue>::Write(Message* m, const param_type& p) {
 514   WriteValue(m, &p, 0);
 515 }
 516
 517 bool ParamTraits<base::ListValue>::Read(
 518     const Message* m, PickleIterator* iter, param_type* r) {
 519   int type;
 520   if (!ReadParam(m, iter, &type) || type != base::Value::TYPE_LIST)
 521     return false;
 522
 523   return ReadListValue(m, iter, r, 0);
 524 }
 525
 526 void ParamTraits<base::ListValue>::Log(const param_type& p, std::string* l) {
 527   std::string json;
 528   base::JSONWriter::Write(&p, &json);
 529   l->append(json);
 530 }
 531
 532 void ParamTraits<base::NullableString16>::Write(Message* m,
 533                                                 const param_type& p) {
 534   WriteParam(m, p.string());
 535   WriteParam(m, p.is_null());
 536 }
 537
 538 bool ParamTraits<base::NullableString16>::Read(const Message* m,
 539                                                PickleIterator* iter,
 540                                                param_type* r) {
 541   string16 string;
 542   if (!ReadParam(m, iter, &string))
 543     return false;
 544   bool is_null;
 545   if (!ReadParam(m, iter, &is_null))
 546     return false;
 547   *r = base::NullableString16(string, is_null);
 548   return true;
 549 }
 550
 551 void ParamTraits<base::NullableString16>::Log(const param_type& p,
 552                                               std::string* l) {
 553   l->append("(");
 554   LogParam(p.string(), l);
 555   l->append(", ");
 556   LogParam(p.is_null(), l);
 557   l->append(")");
 558 }
 559
 560 void ParamTraits<base::PlatformFileInfo>::Write(Message* m,
 561                                                 const param_type& p) {
 562   WriteParam(m, p.size);
 563   WriteParam(m, p.is_directory);
 564   WriteParam(m, p.last_modified.ToDoubleT());
 565   WriteParam(m, p.last_accessed.ToDoubleT());
 566   WriteParam(m, p.creation_time.ToDoubleT());
 567 }
 568
 569 bool ParamTraits<base::PlatformFileInfo>::Read(const Message* m,
 570                                                PickleIterator* iter,
 571                                                param_type* p) {
 572   double last_modified;
 573   double last_accessed;
 574   double creation_time;
 575   bool result =
 576       ReadParam(m, iter, &p->size) &&
 577       ReadParam(m, iter, &p->is_directory) &&
 578       ReadParam(m, iter, &last_modified) &&
 579       ReadParam(m, iter, &last_accessed) &&
 580       ReadParam(m, iter, &creation_time);
 581   if (result) {
 582     p->last_modified = base::Time::FromDoubleT(last_modified);
 583     p->last_accessed = base::Time::FromDoubleT(last_accessed);
 584     p->creation_time = base::Time::FromDoubleT(creation_time);
 585   }
 586   return result;
 587 }
 588
 589 void ParamTraits<base::PlatformFileInfo>::Log(const param_type& p,
 590                                               std::string* l) {
 591   l->append("(");
 592   LogParam(p.size, l);
 593   l->append(",");
 594   LogParam(p.is_directory, l);
 595   l->append(",");
 596   LogParam(p.last_modified.ToDoubleT(), l);
 597   l->append(",");
 598   LogParam(p.last_accessed.ToDoubleT(), l);
 599   l->append(",");
 600   LogParam(p.creation_time.ToDoubleT(), l);
 601   l->append(")");
 602 }
 603
 604 void ParamTraits<base::Time>::Write(Message* m, const param_type& p) {
 605   ParamTraits<int64>::Write(m, p.ToInternalValue());
 606 }
 607
 608 bool ParamTraits<base::Time>::Read(const Message* m, PickleIterator* iter,
 609                                    param_type* r) {
 610   int64 value;
 611   if (!ParamTraits<int64>::Read(m, iter, &value))
 612     return false;
 613   *r = base::Time::FromInternalValue(value);
 614   return true;
 615 }
 616
 617 void ParamTraits<base::Time>::Log(const param_type& p, std::string* l) {
 618   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 619 }
 620
 621 void ParamTraits<base::TimeDelta>::Write(Message* m, const param_type& p) {
 622   ParamTraits<int64>::Write(m, p.ToInternalValue());
 623 }
 624
 625 bool ParamTraits<base::TimeDelta>::Read(const Message* m,
 626                                         PickleIterator* iter,
 627                                         param_type* r) {
 628   int64 value;
 629   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 630   if (ret)
 631     *r = base::TimeDelta::FromInternalValue(value);
 632
 633   return ret;
 634 }
 635
 636 void ParamTraits<base::TimeDelta>::Log(const param_type& p, std::string* l) {
 637   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 638 }
 639
 640 void ParamTraits<base::TimeTicks>::Write(Message* m, const param_type& p) {
 641   ParamTraits<int64>::Write(m, p.ToInternalValue());
 642 }
 643
 644 bool ParamTraits<base::TimeTicks>::Read(const Message* m,
 645                                         PickleIterator* iter,
 646                                         param_type* r) {
 647   int64 value;
 648   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 649   if (ret)
 650     *r = base::TimeTicks::FromInternalValue(value);
 651
 652   return ret;
 653 }
 654
 655 void ParamTraits<base::TimeTicks>::Log(const param_type& p, std::string* l) {
 656   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 657 }
 658
 659 void ParamTraits<IPC::ChannelHandle>::Write(Message* m, const param_type& p) {
 660 #if defined(OS_WIN)
 661   // On Windows marshalling pipe handle is not supported.
 662   DCHECK(p.pipe.handle == NULL);
 663 #endif  // defined (OS_WIN)
 664   WriteParam(m, p.name);
 665 #if defined(OS_POSIX)
 666   WriteParam(m, p.socket);
 667 #endif
 668 }
 669
 670 bool ParamTraits<IPC::ChannelHandle>::Read(const Message* m,
 671                                            PickleIterator* iter,
 672                                            param_type* r) {
 673   return ReadParam(m, iter, &r->name)
 674 #if defined(OS_POSIX)
 675       && ReadParam(m, iter, &r->socket)
 676 #endif
 677       ;
 678 }
 679
 680 void ParamTraits<IPC::ChannelHandle>::Log(const param_type& p,
 681                                           std::string* l) {
 682   l->append(base::StringPrintf("ChannelHandle(%s", p.name.c_str()));
 683 #if defined(OS_POSIX)
 684   l->append(", ");
 685   ParamTraits<base::FileDescriptor>::Log(p.socket, l);
 686 #endif
 687   l->append(")");
 688 }
 689
 690 void ParamTraits<LogData>::Write(Message* m, const param_type& p) {
 691   WriteParam(m, p.channel);
 692   WriteParam(m, p.routing_id);
 693   WriteParam(m, p.type);
 694   WriteParam(m, p.flags);
 695   WriteParam(m, p.sent);
 696   WriteParam(m, p.receive);
 697   WriteParam(m, p.dispatch);
 698   WriteParam(m, p.message_name);
 699   WriteParam(m, p.params);
 700 }
 701
 702 bool ParamTraits<LogData>::Read(const Message* m,
 703                                 PickleIterator* iter,
 704                                 param_type* r) {
 705   return
 706       ReadParam(m, iter, &r->channel) &&
 707       ReadParam(m, iter, &r->routing_id) &&
 708       ReadParam(m, iter, &r->type) &&
 709       ReadParam(m, iter, &r->flags) &&
 710       ReadParam(m, iter, &r->sent) &&
 711       ReadParam(m, iter, &r->receive) &&
 712       ReadParam(m, iter, &r->dispatch) &&
 713       ReadParam(m, iter, &r->message_name) &&
 714       ReadParam(m, iter, &r->params);
 715 }
 716
 717 void ParamTraits<LogData>::Log(const param_type& p, std::string* l) {
 718   // Doesn't make sense to implement this!
 719 }
 720
 721 void ParamTraits<Message>::Write(Message* m, const Message& p) {
 722 #if defined(OS_POSIX)
 723   // We don't serialize the file descriptors in the nested message, so there
 724   // better not be any.
 725   DCHECK(!p.HasFileDescriptors());
 726 #endif
 727
 728   // Don't just write out the message. This is used to send messages between
 729   // NaCl (Posix environment) and the browser (could be on Windows). The message
 730   // header formats differ between these systems (so does handle sharing, but
 731   // we already asserted we don't have any handles). So just write out the
 732   // parts of the header we use.
 733   //
 734   // Be careful also to use only explicitly-sized types. The NaCl environment
 735   // could be 64-bit and the host browser could be 32-bits. The nested message
 736   // may or may not be safe to send between 32-bit and 64-bit systems, but we
 737   // leave that up to the code sending the message to ensure.
 738   m->WriteUInt32(static_cast<uint32>(p.routing_id()));
 739   m->WriteUInt32(p.type());
 740   m->WriteUInt32(p.flags());
 741   m->WriteData(p.payload(), static_cast<uint32>(p.payload_size()));
 742 }
 743
 744 bool ParamTraits<Message>::Read(const Message* m, PickleIterator* iter,
 745                                 Message* r) {
 746   uint32 routing_id, type, flags;
 747   if (!m->ReadUInt32(iter, &routing_id) ||
 748       !m->ReadUInt32(iter, &type) ||
 749       !m->ReadUInt32(iter, &flags))
 750     return false;
 751
 752   int payload_size;
 753   const char* payload;
 754   if (!m->ReadData(iter, &payload, &payload_size))
 755     return false;
 756
 757   r->SetHeaderValues(static_cast<int32>(routing_id), type, flags);
 758   return r->WriteBytes(payload, payload_size);
 759 }
 760
 761 void ParamTraits<Message>::Log(const Message& p, std::string* l) {
 762   l->append("<IPC::Message>");
 763 }
 764
 765 #if defined(OS_WIN)
 766 // Note that HWNDs/HANDLE/HCURSOR/HACCEL etc are always 32 bits, even on 64
 767 // bit systems. That's why we use the Windows macros to convert to 32 bits.
 768 void ParamTraits<HANDLE>::Write(Message* m, const param_type& p) {
 769   m->WriteInt(HandleToLong(p));
 770 }
 771
 772 bool ParamTraits<HANDLE>::Read(const Message* m, PickleIterator* iter,
 773                                param_type* r) {
 774   int32 temp;
 775   if (!m->ReadInt(iter, &temp))
 776     return false;
 777   *r = LongToHandle(temp);
 778   return true;
 779 }
 780
 781 void ParamTraits<HANDLE>::Log(const param_type& p, std::string* l) {
 782   l->append(base::StringPrintf("0x%X", p));
 783 }
 784
 785 void ParamTraits<LOGFONT>::Write(Message* m, const param_type& p) {
 786   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(LOGFONT));
 787 }
 788
 789 bool ParamTraits<LOGFONT>::Read(const Message* m, PickleIterator* iter,
 790                                 param_type* r) {
 791   const char *data;
 792   int data_size = 0;
 793   if (m->ReadData(iter, &data, &data_size) && data_size == sizeof(LOGFONT)) {
 794     const LOGFONT *font = reinterpret_cast<LOGFONT*>(const_cast<char*>(data));
 795     if (_tcsnlen(font->lfFaceName, LF_FACESIZE) < LF_FACESIZE) {
 796       memcpy(r, data, sizeof(LOGFONT));
 797       return true;
 798     }
 799   }
 800
 801   NOTREACHED();
 802   return false;
 803 }
 804
 805 void ParamTraits<LOGFONT>::Log(const param_type& p, std::string* l) {
 806   l->append(base::StringPrintf("<LOGFONT>"));
 807 }
 808
 809 void ParamTraits<MSG>::Write(Message* m, const param_type& p) {
 810   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(MSG));
 811 }
 812
 813 bool ParamTraits<MSG>::Read(const Message* m, PickleIterator* iter,
 814                             param_type* r) {
 815   const char *data;
 816   int data_size = 0;
 817   bool result = m->ReadData(iter, &data, &data_size);
 818   if (result && data_size == sizeof(MSG)) {
 819     memcpy(r, data, sizeof(MSG));
 820   } else {
 821     result = false;
 822     NOTREACHED();
 823   }
 824
 825   return result;
 826 }
 827
 828 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
 829   l->append("<MSG>");
 830 }
 831
 832 #endif  // OS_WIN
 833
 834 }  // namespace IPC