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 #include "ipc/ipc_message_attachment_set.h"
  17
  18 #if defined(OS_WIN)
  19 #include <tchar.h>
  20 #endif
  21
  22 namespace IPC {
  23
  24 namespace {
  25
  26 const int kMaxRecursionDepth = 100;
  27
  28 template<typename CharType>
  29 void LogBytes(const std::vector<CharType>& data, std::string* out) {
  30 #if defined(OS_WIN)
  31   // Windows has a GUI for logging, which can handle arbitrary binary data.
  32   for (size_t i = 0; i < data.size(); ++i)
  33     out->push_back(data[i]);
  34 #else
  35   // On POSIX, we log to stdout, which we assume can display ASCII.
  36   static const size_t kMaxBytesToLog = 100;
  37   for (size_t i = 0; i < std::min(data.size(), kMaxBytesToLog); ++i) {
  38     if (isprint(data[i]))
  39       out->push_back(data[i]);
  40     else
  41       out->append(
  42           base::StringPrintf("[%02X]", static_cast<unsigned char>(data[i])));
  43   }
  44   if (data.size() > kMaxBytesToLog) {
  45     out->append(base::StringPrintf(
  46         " and %u more bytes",
  47         static_cast<unsigned>(data.size() - kMaxBytesToLog)));
  48   }
  49 #endif
  50 }
  51
  52 bool ReadValue(const Message* m, PickleIterator* iter, base::Value** value,
  53                int recursion);
  54
  55 void WriteValue(Message* m, const base::Value* value, int recursion) {
  56   bool result;
  57   if (recursion > kMaxRecursionDepth) {
  58     LOG(WARNING) << "Max recursion depth hit in WriteValue.";
  59     return;
  60   }
  61
  62   m->WriteInt(value->GetType());
  63
  64   switch (value->GetType()) {
  65     case base::Value::TYPE_NULL:
  66     break;
  67     case base::Value::TYPE_BOOLEAN: {
  68       bool val;
  69       result = value->GetAsBoolean(&val);
  70       DCHECK(result);
  71       WriteParam(m, val);
  72       break;
  73     }
  74     case base::Value::TYPE_INTEGER: {
  75       int val;
  76       result = value->GetAsInteger(&val);
  77       DCHECK(result);
  78       WriteParam(m, val);
  79       break;
  80     }
  81     case base::Value::TYPE_DOUBLE: {
  82       double val;
  83       result = value->GetAsDouble(&val);
  84       DCHECK(result);
  85       WriteParam(m, val);
  86       break;
  87     }
  88     case base::Value::TYPE_STRING: {
  89       std::string val;
  90       result = value->GetAsString(&val);
  91       DCHECK(result);
  92       WriteParam(m, val);
  93       break;
  94     }
  95     case base::Value::TYPE_BINARY: {
  96       const base::BinaryValue* binary =
  97           static_cast<const base::BinaryValue*>(value);
  98       m->WriteData(binary->GetBuffer(), static_cast<int>(binary->GetSize()));
  99       break;
 100     }
 101     case base::Value::TYPE_DICTIONARY: {
 102       const base::DictionaryValue* dict =
 103           static_cast<const base::DictionaryValue*>(value);
 104
 105       WriteParam(m, static_cast<int>(dict->size()));
 106
 107       for (base::DictionaryValue::Iterator it(*dict); !it.IsAtEnd();
 108            it.Advance()) {
 109         WriteParam(m, it.key());
 110         WriteValue(m, &it.value(), recursion + 1);
 111       }
 112       break;
 113     }
 114     case base::Value::TYPE_LIST: {
 115       const base::ListValue* list = static_cast<const base::ListValue*>(value);
 116       WriteParam(m, static_cast<int>(list->GetSize()));
 117       for (base::ListValue::const_iterator it = list->begin();
 118            it != list->end(); ++it) {
 119         WriteValue(m, *it, recursion + 1);
 120       }
 121       break;
 122     }
 123   }
 124 }
 125
 126 // Helper for ReadValue that reads a DictionaryValue into a pre-allocated
 127 // object.
 128 bool ReadDictionaryValue(const Message* m, PickleIterator* iter,
 129                          base::DictionaryValue* value, int recursion) {
 130   int size;
 131   if (!ReadParam(m, iter, &size))
 132     return false;
 133
 134   for (int i = 0; i < size; ++i) {
 135     std::string key;
 136     base::Value* subval;
 137     if (!ReadParam(m, iter, &key) ||
 138         !ReadValue(m, iter, &subval, recursion + 1))
 139       return false;
 140     value->SetWithoutPathExpansion(key, subval);
 141   }
 142
 143   return true;
 144 }
 145
 146 // Helper for ReadValue that reads a ReadListValue into a pre-allocated
 147 // object.
 148 bool ReadListValue(const Message* m, PickleIterator* iter,
 149                    base::ListValue* value, int recursion) {
 150   int size;
 151   if (!ReadParam(m, iter, &size))
 152     return false;
 153
 154   for (int i = 0; i < size; ++i) {
 155     base::Value* subval;
 156     if (!ReadValue(m, iter, &subval, recursion + 1))
 157       return false;
 158     value->Set(i, subval);
 159   }
 160
 161   return true;
 162 }
 163
 164 bool ReadValue(const Message* m, PickleIterator* iter, base::Value** value,
 165                int recursion) {
 166   if (recursion > kMaxRecursionDepth) {
 167     LOG(WARNING) << "Max recursion depth hit in ReadValue.";
 168     return false;
 169   }
 170
 171   int type;
 172   if (!ReadParam(m, iter, &type))
 173     return false;
 174
 175   switch (type) {
 176     case base::Value::TYPE_NULL:
 177     *value = base::Value::CreateNullValue();
 178     break;
 179     case base::Value::TYPE_BOOLEAN: {
 180       bool val;
 181       if (!ReadParam(m, iter, &val))
 182         return false;
 183       *value = new base::FundamentalValue(val);
 184       break;
 185     }
 186     case base::Value::TYPE_INTEGER: {
 187       int val;
 188       if (!ReadParam(m, iter, &val))
 189         return false;
 190       *value = new base::FundamentalValue(val);
 191       break;
 192     }
 193     case base::Value::TYPE_DOUBLE: {
 194       double val;
 195       if (!ReadParam(m, iter, &val))
 196         return false;
 197       *value = new base::FundamentalValue(val);
 198       break;
 199     }
 200     case base::Value::TYPE_STRING: {
 201       std::string val;
 202       if (!ReadParam(m, iter, &val))
 203         return false;
 204       *value = new base::StringValue(val);
 205       break;
 206     }
 207     case base::Value::TYPE_BINARY: {
 208       const char* data;
 209       int length;
 210       if (!iter->ReadData(&data, &length))
 211         return false;
 212       *value = base::BinaryValue::CreateWithCopiedBuffer(data, length);
 213       break;
 214     }
 215     case base::Value::TYPE_DICTIONARY: {
 216       scoped_ptr<base::DictionaryValue> val(new base::DictionaryValue());
 217       if (!ReadDictionaryValue(m, iter, val.get(), recursion))
 218         return false;
 219       *value = val.release();
 220       break;
 221     }
 222     case base::Value::TYPE_LIST: {
 223       scoped_ptr<base::ListValue> val(new base::ListValue());
 224       if (!ReadListValue(m, iter, val.get(), recursion))
 225         return false;
 226       *value = val.release();
 227       break;
 228     }
 229     default:
 230     return false;
 231   }
 232
 233   return true;
 234 }
 235
 236 }  // namespace
 237
 238 // -----------------------------------------------------------------------------
 239
 240 LogData::LogData()
 241     : routing_id(0),
 242       type(0),
 243       sent(0),
 244       receive(0),
 245       dispatch(0) {
 246 }
 247
 248 LogData::~LogData() {
 249 }
 250
 251 void ParamTraits<bool>::Log(const param_type& p, std::string* l) {
 252   l->append(p ? "true" : "false");
 253 }
 254
 255 void ParamTraits<unsigned char>::Write(Message* m, const param_type& p) {
 256   m->WriteBytes(&p, sizeof(param_type));
 257 }
 258
 259 bool ParamTraits<unsigned char>::Read(const Message* m, PickleIterator* iter,
 260                                        param_type* r) {
 261   const char* data;
 262   if (!iter->ReadBytes(&data, sizeof(param_type)))
 263     return false;
 264   memcpy(r, data, sizeof(param_type));
 265   return true;
 266 }
 267
 268 void ParamTraits<unsigned char>::Log(const param_type& p, std::string* l) {
 269   l->append(base::UintToString(p));
 270 }
 271
 272 void ParamTraits<unsigned short>::Write(Message* m, const param_type& p) {
 273   m->WriteBytes(&p, sizeof(param_type));
 274 }
 275
 276 bool ParamTraits<unsigned short>::Read(const Message* m, PickleIterator* iter,
 277                                        param_type* r) {
 278   const char* data;
 279   if (!iter->ReadBytes(&data, sizeof(param_type)))
 280     return false;
 281   memcpy(r, data, sizeof(param_type));
 282   return true;
 283 }
 284
 285 void ParamTraits<unsigned short>::Log(const param_type& p, std::string* l) {
 286   l->append(base::UintToString(p));
 287 }
 288
 289 void ParamTraits<int>::Log(const param_type& p, std::string* l) {
 290   l->append(base::IntToString(p));
 291 }
 292
 293 void ParamTraits<unsigned int>::Log(const param_type& p, std::string* l) {
 294   l->append(base::UintToString(p));
 295 }
 296
 297 void ParamTraits<long>::Log(const param_type& p, std::string* l) {
 298   l->append(base::Int64ToString(static_cast<int64>(p)));
 299 }
 300
 301 void ParamTraits<unsigned long>::Log(const param_type& p, std::string* l) {
 302   l->append(base::Uint64ToString(static_cast<uint64>(p)));
 303 }
 304
 305 void ParamTraits<long long>::Log(const param_type& p, std::string* l) {
 306   l->append(base::Int64ToString(static_cast<int64>(p)));
 307 }
 308
 309 void ParamTraits<unsigned long long>::Log(const param_type& p, std::string* l) {
 310   l->append(base::Uint64ToString(p));
 311 }
 312
 313 void ParamTraits<float>::Log(const param_type& p, std::string* l) {
 314   l->append(base::StringPrintf("%e", p));
 315 }
 316
 317 void ParamTraits<double>::Write(Message* m, const param_type& p) {
 318   m->WriteBytes(reinterpret_cast<const char*>(&p), sizeof(param_type));
 319 }
 320
 321 bool ParamTraits<double>::Read(const Message* m, PickleIterator* iter,
 322                                param_type* r) {
 323   const char *data;
 324   if (!iter->ReadBytes(&data, sizeof(*r))) {
 325     NOTREACHED();
 326     return false;
 327   }
 328   memcpy(r, data, sizeof(param_type));
 329   return true;
 330 }
 331
 332 void ParamTraits<double>::Log(const param_type& p, std::string* l) {
 333   l->append(base::StringPrintf("%e", p));
 334 }
 335
 336
 337 void ParamTraits<std::string>::Log(const param_type& p, std::string* l) {
 338   l->append(p);
 339 }
 340
 341 void ParamTraits<std::wstring>::Log(const param_type& p, std::string* l) {
 342   l->append(base::WideToUTF8(p));
 343 }
 344
 345 #if !defined(WCHAR_T_IS_UTF16)
 346 void ParamTraits<base::string16>::Log(const param_type& p, std::string* l) {
 347   l->append(base::UTF16ToUTF8(p));
 348 }
 349 #endif
 350
 351 void ParamTraits<std::vector<char> >::Write(Message* m, const param_type& p) {
 352   if (p.empty()) {
 353     m->WriteData(NULL, 0);
 354   } else {
 355     m->WriteData(&p.front(), static_cast<int>(p.size()));
 356   }
 357 }
 358
 359 bool ParamTraits<std::vector<char> >::Read(const Message* m,
 360                                            PickleIterator* iter,
 361                                            param_type* r) {
 362   const char *data;
 363   int data_size = 0;
 364   if (!iter->ReadData(&data, &data_size) || data_size < 0)
 365     return false;
 366   r->resize(data_size);
 367   if (data_size)
 368     memcpy(&r->front(), data, data_size);
 369   return true;
 370 }
 371
 372 void ParamTraits<std::vector<char> >::Log(const param_type& p, std::string* l) {
 373   LogBytes(p, l);
 374 }
 375
 376 void ParamTraits<std::vector<unsigned char> >::Write(Message* m,
 377                                                      const param_type& p) {
 378   if (p.empty()) {
 379     m->WriteData(NULL, 0);
 380   } else {
 381     m->WriteData(reinterpret_cast<const char*>(&p.front()),
 382                  static_cast<int>(p.size()));
 383   }
 384 }
 385
 386 bool ParamTraits<std::vector<unsigned char> >::Read(const Message* m,
 387                                                     PickleIterator* iter,
 388                                                     param_type* r) {
 389   const char *data;
 390   int data_size = 0;
 391   if (!iter->ReadData(&data, &data_size) || data_size < 0)
 392     return false;
 393   r->resize(data_size);
 394   if (data_size)
 395     memcpy(&r->front(), data, data_size);
 396   return true;
 397 }
 398
 399 void ParamTraits<std::vector<unsigned char> >::Log(const param_type& p,
 400                                                    std::string* l) {
 401   LogBytes(p, l);
 402 }
 403
 404 void ParamTraits<std::vector<bool> >::Write(Message* m, const param_type& p) {
 405   WriteParam(m, static_cast<int>(p.size()));
 406   // Cast to bool below is required because libc++'s
 407   // vector<bool>::const_reference is different from bool, and we want to avoid
 408   // writing an extra specialization of ParamTraits for it.
 409   for (size_t i = 0; i < p.size(); i++)
 410     WriteParam(m, static_cast<bool>(p[i]));
 411 }
 412
 413 bool ParamTraits<std::vector<bool> >::Read(const Message* m,
 414                                            PickleIterator* iter,
 415                                            param_type* r) {
 416   int size;
 417   // ReadLength() checks for < 0 itself.
 418   if (!iter->ReadLength(&size))
 419     return false;
 420   r->resize(size);
 421   for (int i = 0; i < size; i++) {
 422     bool value;
 423     if (!ReadParam(m, iter, &value))
 424       return false;
 425     (*r)[i] = value;
 426   }
 427   return true;
 428 }
 429
 430 void ParamTraits<std::vector<bool> >::Log(const param_type& p, std::string* l) {
 431   for (size_t i = 0; i < p.size(); ++i) {
 432     if (i != 0)
 433       l->push_back(' ');
 434     LogParam(static_cast<bool>(p[i]), l);
 435   }
 436 }
 437
 438 void ParamTraits<base::DictionaryValue>::Write(Message* m,
 439                                                const param_type& p) {
 440   WriteValue(m, &p, 0);
 441 }
 442
 443 bool ParamTraits<base::DictionaryValue>::Read(
 444     const Message* m, PickleIterator* iter, param_type* r) {
 445   int type;
 446   if (!ReadParam(m, iter, &type) || type != base::Value::TYPE_DICTIONARY)
 447     return false;
 448
 449   return ReadDictionaryValue(m, iter, r, 0);
 450 }
 451
 452 void ParamTraits<base::DictionaryValue>::Log(const param_type& p,
 453                                              std::string* l) {
 454   std::string json;
 455   base::JSONWriter::Write(&p, &json);
 456   l->append(json);
 457 }
 458
 459 #if defined(OS_POSIX)
 460 void ParamTraits<base::FileDescriptor>::Write(Message* m, const param_type& p) {
 461   const bool valid = p.fd >= 0;
 462   WriteParam(m, valid);
 463
 464   if (!valid)
 465     return;
 466
 467   if (p.auto_close) {
 468     if (!m->WriteFile(base::ScopedFD(p.fd)))
 469       NOTREACHED();
 470   } else {
 471     if (!m->WriteBorrowingFile(p.fd))
 472       NOTREACHED();
 473   }
 474 }
 475
 476 bool ParamTraits<base::FileDescriptor>::Read(const Message* m,
 477                                              PickleIterator* iter,
 478                                              param_type* r) {
 479   *r = base::FileDescriptor();
 480
 481   bool valid;
 482   if (!ReadParam(m, iter, &valid))
 483     return false;
 484
 485   // TODO(morrita): Seems like this should return false.
 486   if (!valid)
 487     return true;
 488
 489   base::ScopedFD fd;
 490   if (!m->ReadFile(iter, &fd))
 491     return false;
 492
 493   *r = base::FileDescriptor(fd.release(), true);
 494   return true;
 495 }
 496
 497 void ParamTraits<base::FileDescriptor>::Log(const param_type& p,
 498                                             std::string* l) {
 499   if (p.auto_close) {
 500     l->append(base::StringPrintf("FD(%d auto-close)", p.fd));
 501   } else {
 502     l->append(base::StringPrintf("FD(%d)", p.fd));
 503   }
 504 }
 505 #endif  // defined(OS_POSIX)
 506
 507 void ParamTraits<base::FilePath>::Write(Message* m, const param_type& p) {
 508   p.WriteToPickle(m);
 509 }
 510
 511 bool ParamTraits<base::FilePath>::Read(const Message* m,
 512                                        PickleIterator* iter,
 513                                        param_type* r) {
 514   return r->ReadFromPickle(iter);
 515 }
 516
 517 void ParamTraits<base::FilePath>::Log(const param_type& p, std::string* l) {
 518   ParamTraits<base::FilePath::StringType>::Log(p.value(), l);
 519 }
 520
 521 void ParamTraits<base::ListValue>::Write(Message* m, const param_type& p) {
 522   WriteValue(m, &p, 0);
 523 }
 524
 525 bool ParamTraits<base::ListValue>::Read(
 526     const Message* m, PickleIterator* iter, param_type* r) {
 527   int type;
 528   if (!ReadParam(m, iter, &type) || type != base::Value::TYPE_LIST)
 529     return false;
 530
 531   return ReadListValue(m, iter, r, 0);
 532 }
 533
 534 void ParamTraits<base::ListValue>::Log(const param_type& p, std::string* l) {
 535   std::string json;
 536   base::JSONWriter::Write(&p, &json);
 537   l->append(json);
 538 }
 539
 540 void ParamTraits<base::NullableString16>::Write(Message* m,
 541                                                 const param_type& p) {
 542   WriteParam(m, p.string());
 543   WriteParam(m, p.is_null());
 544 }
 545
 546 bool ParamTraits<base::NullableString16>::Read(const Message* m,
 547                                                PickleIterator* iter,
 548                                                param_type* r) {
 549   base::string16 string;
 550   if (!ReadParam(m, iter, &string))
 551     return false;
 552   bool is_null;
 553   if (!ReadParam(m, iter, &is_null))
 554     return false;
 555   *r = base::NullableString16(string, is_null);
 556   return true;
 557 }
 558
 559 void ParamTraits<base::NullableString16>::Log(const param_type& p,
 560                                               std::string* l) {
 561   l->append("(");
 562   LogParam(p.string(), l);
 563   l->append(", ");
 564   LogParam(p.is_null(), l);
 565   l->append(")");
 566 }
 567
 568 void ParamTraits<base::File::Info>::Write(Message* m,
 569                                           const param_type& p) {
 570   WriteParam(m, p.size);
 571   WriteParam(m, p.is_directory);
 572   WriteParam(m, p.last_modified.ToDoubleT());
 573   WriteParam(m, p.last_accessed.ToDoubleT());
 574   WriteParam(m, p.creation_time.ToDoubleT());
 575 }
 576
 577 bool ParamTraits<base::File::Info>::Read(const Message* m,
 578                                          PickleIterator* iter,
 579                                          param_type* p) {
 580   double last_modified, last_accessed, creation_time;
 581   if (!ReadParam(m, iter, &p->size) ||
 582       !ReadParam(m, iter, &p->is_directory) ||
 583       !ReadParam(m, iter, &last_modified) ||
 584       !ReadParam(m, iter, &last_accessed) ||
 585       !ReadParam(m, iter, &creation_time))
 586     return false;
 587   p->last_modified = base::Time::FromDoubleT(last_modified);
 588   p->last_accessed = base::Time::FromDoubleT(last_accessed);
 589   p->creation_time = base::Time::FromDoubleT(creation_time);
 590   return true;
 591 }
 592
 593 void ParamTraits<base::File::Info>::Log(const param_type& p,
 594                                         std::string* l) {
 595   l->append("(");
 596   LogParam(p.size, l);
 597   l->append(",");
 598   LogParam(p.is_directory, l);
 599   l->append(",");
 600   LogParam(p.last_modified.ToDoubleT(), l);
 601   l->append(",");
 602   LogParam(p.last_accessed.ToDoubleT(), l);
 603   l->append(",");
 604   LogParam(p.creation_time.ToDoubleT(), l);
 605   l->append(")");
 606 }
 607
 608 void ParamTraits<base::Time>::Write(Message* m, const param_type& p) {
 609   ParamTraits<int64>::Write(m, p.ToInternalValue());
 610 }
 611
 612 bool ParamTraits<base::Time>::Read(const Message* m, PickleIterator* iter,
 613                                    param_type* r) {
 614   int64 value;
 615   if (!ParamTraits<int64>::Read(m, iter, &value))
 616     return false;
 617   *r = base::Time::FromInternalValue(value);
 618   return true;
 619 }
 620
 621 void ParamTraits<base::Time>::Log(const param_type& p, std::string* l) {
 622   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 623 }
 624
 625 void ParamTraits<base::TimeDelta>::Write(Message* m, const param_type& p) {
 626   ParamTraits<int64>::Write(m, p.ToInternalValue());
 627 }
 628
 629 bool ParamTraits<base::TimeDelta>::Read(const Message* m,
 630                                         PickleIterator* iter,
 631                                         param_type* r) {
 632   int64 value;
 633   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 634   if (ret)
 635     *r = base::TimeDelta::FromInternalValue(value);
 636
 637   return ret;
 638 }
 639
 640 void ParamTraits<base::TimeDelta>::Log(const param_type& p, std::string* l) {
 641   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 642 }
 643
 644 void ParamTraits<base::TimeTicks>::Write(Message* m, const param_type& p) {
 645   ParamTraits<int64>::Write(m, p.ToInternalValue());
 646 }
 647
 648 bool ParamTraits<base::TimeTicks>::Read(const Message* m,
 649                                         PickleIterator* iter,
 650                                         param_type* r) {
 651   int64 value;
 652   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 653   if (ret)
 654     *r = base::TimeTicks::FromInternalValue(value);
 655
 656   return ret;
 657 }
 658
 659 void ParamTraits<base::TimeTicks>::Log(const param_type& p, std::string* l) {
 660   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 661 }
 662
 663 void ParamTraits<IPC::ChannelHandle>::Write(Message* m, const param_type& p) {
 664 #if defined(OS_WIN)
 665   // On Windows marshalling pipe handle is not supported.
 666   DCHECK(p.pipe.handle == NULL);
 667 #endif  // defined (OS_WIN)
 668   WriteParam(m, p.name);
 669 #if defined(OS_POSIX)
 670   WriteParam(m, p.socket);
 671 #endif
 672 }
 673
 674 bool ParamTraits<IPC::ChannelHandle>::Read(const Message* m,
 675                                            PickleIterator* iter,
 676                                            param_type* r) {
 677   return ReadParam(m, iter, &r->name)
 678 #if defined(OS_POSIX)
 679       && ReadParam(m, iter, &r->socket)
 680 #endif
 681       ;
 682 }
 683
 684 void ParamTraits<IPC::ChannelHandle>::Log(const param_type& p,
 685                                           std::string* l) {
 686   l->append(base::StringPrintf("ChannelHandle(%s", p.name.c_str()));
 687 #if defined(OS_POSIX)
 688   l->append(", ");
 689   ParamTraits<base::FileDescriptor>::Log(p.socket, l);
 690 #endif
 691   l->append(")");
 692 }
 693
 694 void ParamTraits<LogData>::Write(Message* m, const param_type& p) {
 695   WriteParam(m, p.channel);
 696   WriteParam(m, p.routing_id);
 697   WriteParam(m, p.type);
 698   WriteParam(m, p.flags);
 699   WriteParam(m, p.sent);
 700   WriteParam(m, p.receive);
 701   WriteParam(m, p.dispatch);
 702   WriteParam(m, p.message_name);
 703   WriteParam(m, p.params);
 704 }
 705
 706 bool ParamTraits<LogData>::Read(const Message* m,
 707                                 PickleIterator* iter,
 708                                 param_type* r) {
 709   return
 710       ReadParam(m, iter, &r->channel) &&
 711       ReadParam(m, iter, &r->routing_id) &&
 712       ReadParam(m, iter, &r->type) &&
 713       ReadParam(m, iter, &r->flags) &&
 714       ReadParam(m, iter, &r->sent) &&
 715       ReadParam(m, iter, &r->receive) &&
 716       ReadParam(m, iter, &r->dispatch) &&
 717       ReadParam(m, iter, &r->message_name) &&
 718       ReadParam(m, iter, &r->params);
 719 }
 720
 721 void ParamTraits<LogData>::Log(const param_type& p, std::string* l) {
 722   // Doesn't make sense to implement this!
 723 }
 724
 725 void ParamTraits<Message>::Write(Message* m, const Message& p) {
 726 #if defined(OS_POSIX)
 727   // We don't serialize the file descriptors in the nested message, so there
 728   // better not be any.
 729   DCHECK(!p.HasFileDescriptors());
 730 #endif
 731
 732   // Don't just write out the message. This is used to send messages between
 733   // NaCl (Posix environment) and the browser (could be on Windows). The message
 734   // header formats differ between these systems (so does handle sharing, but
 735   // we already asserted we don't have any handles). So just write out the
 736   // parts of the header we use.
 737   //
 738   // Be careful also to use only explicitly-sized types. The NaCl environment
 739   // could be 64-bit and the host browser could be 32-bits. The nested message
 740   // may or may not be safe to send between 32-bit and 64-bit systems, but we
 741   // leave that up to the code sending the message to ensure.
 742   m->WriteUInt32(static_cast<uint32>(p.routing_id()));
 743   m->WriteUInt32(p.type());
 744   m->WriteUInt32(p.flags());
 745   m->WriteData(p.payload(), static_cast<uint32>(p.payload_size()));
 746 }
 747
 748 bool ParamTraits<Message>::Read(const Message* m, PickleIterator* iter,
 749                                 Message* r) {
 750   uint32 routing_id, type, flags;
 751   if (!iter->ReadUInt32(&routing_id) ||
 752       !iter->ReadUInt32(&type) ||
 753       !iter->ReadUInt32(&flags))
 754     return false;
 755
 756   int payload_size;
 757   const char* payload;
 758   if (!iter->ReadData(&payload, &payload_size))
 759     return false;
 760
 761   r->SetHeaderValues(static_cast<int32>(routing_id), type, flags);
 762   return r->WriteBytes(payload, payload_size);
 763 }
 764
 765 void ParamTraits<Message>::Log(const Message& p, std::string* l) {
 766   l->append("<IPC::Message>");
 767 }
 768
 769 #if defined(OS_WIN)
 770 // Note that HWNDs/HANDLE/HCURSOR/HACCEL etc are always 32 bits, even on 64
 771 // bit systems. That's why we use the Windows macros to convert to 32 bits.
 772 void ParamTraits<HANDLE>::Write(Message* m, const param_type& p) {
 773   m->WriteInt(HandleToLong(p));
 774 }
 775
 776 bool ParamTraits<HANDLE>::Read(const Message* m, PickleIterator* iter,
 777                                param_type* r) {
 778   int32 temp;
 779   if (!iter->ReadInt(&temp))
 780     return false;
 781   *r = LongToHandle(temp);
 782   return true;
 783 }
 784
 785 void ParamTraits<HANDLE>::Log(const param_type& p, std::string* l) {
 786   l->append(base::StringPrintf("0x%X", p));
 787 }
 788
 789 void ParamTraits<LOGFONT>::Write(Message* m, const param_type& p) {
 790   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(LOGFONT));
 791 }
 792
 793 bool ParamTraits<LOGFONT>::Read(const Message* m, PickleIterator* iter,
 794                                 param_type* r) {
 795   const char *data;
 796   int data_size = 0;
 797   if (iter->ReadData(&data, &data_size) && data_size == sizeof(LOGFONT)) {
 798     const LOGFONT *font = reinterpret_cast<LOGFONT*>(const_cast<char*>(data));
 799     if (_tcsnlen(font->lfFaceName, LF_FACESIZE) < LF_FACESIZE) {
 800       memcpy(r, data, sizeof(LOGFONT));
 801       return true;
 802     }
 803   }
 804
 805   NOTREACHED();
 806   return false;
 807 }
 808
 809 void ParamTraits<LOGFONT>::Log(const param_type& p, std::string* l) {
 810   l->append(base::StringPrintf("<LOGFONT>"));
 811 }
 812
 813 void ParamTraits<MSG>::Write(Message* m, const param_type& p) {
 814   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(MSG));
 815 }
 816
 817 bool ParamTraits<MSG>::Read(const Message* m, PickleIterator* iter,
 818                             param_type* r) {
 819   const char *data;
 820   int data_size = 0;
 821   bool result = iter->ReadData(&data, &data_size);
 822   if (result && data_size == sizeof(MSG)) {
 823     memcpy(r, data, sizeof(MSG));
 824   } else {
 825     result = false;
 826     NOTREACHED();
 827   }
 828
 829   return result;
 830 }
 831
 832 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
 833   l->append("<MSG>");
 834 }
 835
 836 #endif  // OS_WIN
 837
 838 }  // namespace IPC