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<unsigned char>::Write(Message* m, const param_type& p) {
 257   m->WriteBytes(&p, sizeof(param_type));
 258 }
 259
 260 bool ParamTraits<unsigned char>::Read(const Message* m, PickleIterator* iter,
 261                                        param_type* r) {
 262   const char* data;
 263   if (!m->ReadBytes(iter, &data, sizeof(param_type)))
 264     return false;
 265   memcpy(r, data, sizeof(param_type));
 266   return true;
 267 }
 268
 269 void ParamTraits<unsigned char>::Log(const param_type& p, std::string* l) {
 270   l->append(base::UintToString(p));
 271 }
 272
 273 void ParamTraits<unsigned short>::Write(Message* m, const param_type& p) {
 274   m->WriteBytes(&p, sizeof(param_type));
 275 }
 276
 277 bool ParamTraits<unsigned short>::Read(const Message* m, PickleIterator* iter,
 278                                        param_type* r) {
 279   const char* data;
 280   if (!m->ReadBytes(iter, &data, sizeof(param_type)))
 281     return false;
 282   memcpy(r, data, sizeof(param_type));
 283   return true;
 284 }
 285
 286 void ParamTraits<unsigned short>::Log(const param_type& p, std::string* l) {
 287   l->append(base::UintToString(p));
 288 }
 289
 290 void ParamTraits<int>::Log(const param_type& p, std::string* l) {
 291   l->append(base::IntToString(p));
 292 }
 293
 294 void ParamTraits<unsigned int>::Log(const param_type& p, std::string* l) {
 295   l->append(base::UintToString(p));
 296 }
 297
 298 void ParamTraits<long>::Log(const param_type& p, std::string* l) {
 299   l->append(base::Int64ToString(static_cast<int64>(p)));
 300 }
 301
 302 void ParamTraits<unsigned long>::Log(const param_type& p, std::string* l) {
 303   l->append(base::Uint64ToString(static_cast<uint64>(p)));
 304 }
 305
 306 void ParamTraits<long long>::Log(const param_type& p, std::string* l) {
 307   l->append(base::Int64ToString(static_cast<int64>(p)));
 308 }
 309
 310 void ParamTraits<unsigned long long>::Log(const param_type& p, std::string* l) {
 311   l->append(base::Uint64ToString(p));
 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->WriteBytes(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   if (!m->ReadBytes(iter, &data, sizeof(*r))) {
 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(base::WideToUTF8(p));
 344 }
 345
 346 #if !defined(WCHAR_T_IS_UTF16)
 347 void ParamTraits<base::string16>::Log(const param_type& p, std::string* l) {
 348   l->append(base::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<base::DictionaryValue>::Write(Message* m,
 440                                                const param_type& p) {
 441   WriteValue(m, &p, 0);
 442 }
 443
 444 bool ParamTraits<base::DictionaryValue>::Read(
 445     const Message* m, PickleIterator* iter, param_type* r) {
 446   int type;
 447   if (!ReadParam(m, iter, &type) || type != base::Value::TYPE_DICTIONARY)
 448     return false;
 449
 450   return ReadDictionaryValue(m, iter, r, 0);
 451 }
 452
 453 void ParamTraits<base::DictionaryValue>::Log(const param_type& p,
 454                                              std::string* l) {
 455   std::string json;
 456   base::JSONWriter::Write(&p, &json);
 457   l->append(json);
 458 }
 459
 460 #if defined(OS_POSIX)
 461 void ParamTraits<base::FileDescriptor>::Write(Message* m, const param_type& p) {
 462   const bool valid = p.fd >= 0;
 463   WriteParam(m, valid);
 464
 465   if (!valid)
 466     return;
 467
 468   if (p.auto_close) {
 469     if (!m->WriteFile(base::ScopedFD(p.fd)))
 470       NOTREACHED();
 471   } else {
 472     if (!m->WriteBorrowingFile(p.fd))
 473       NOTREACHED();
 474   }
 475 }
 476
 477 bool ParamTraits<base::FileDescriptor>::Read(const Message* m,
 478                                              PickleIterator* iter,
 479                                              param_type* r) {
 480   *r = base::FileDescriptor();
 481
 482   bool valid;
 483   if (!ReadParam(m, iter, &valid))
 484     return false;
 485
 486   // TODO(morrita): Seems like this should return false.
 487   if (!valid)
 488     return true;
 489
 490   base::ScopedFD fd;
 491   if (!m->ReadFile(iter, &fd))
 492     return false;
 493
 494   *r = base::FileDescriptor(fd.release(), true);
 495   return true;
 496 }
 497
 498 void ParamTraits<base::FileDescriptor>::Log(const param_type& p,
 499                                             std::string* l) {
 500   if (p.auto_close) {
 501     l->append(base::StringPrintf("FD(%d auto-close)", p.fd));
 502   } else {
 503     l->append(base::StringPrintf("FD(%d)", p.fd));
 504   }
 505 }
 506 #endif  // defined(OS_POSIX)
 507
 508 void ParamTraits<base::FilePath>::Write(Message* m, const param_type& p) {
 509   p.WriteToPickle(m);
 510 }
 511
 512 bool ParamTraits<base::FilePath>::Read(const Message* m,
 513                                        PickleIterator* iter,
 514                                        param_type* r) {
 515   return r->ReadFromPickle(iter);
 516 }
 517
 518 void ParamTraits<base::FilePath>::Log(const param_type& p, std::string* l) {
 519   ParamTraits<base::FilePath::StringType>::Log(p.value(), l);
 520 }
 521
 522 void ParamTraits<base::ListValue>::Write(Message* m, const param_type& p) {
 523   WriteValue(m, &p, 0);
 524 }
 525
 526 bool ParamTraits<base::ListValue>::Read(
 527     const Message* m, PickleIterator* iter, param_type* r) {
 528   int type;
 529   if (!ReadParam(m, iter, &type) || type != base::Value::TYPE_LIST)
 530     return false;
 531
 532   return ReadListValue(m, iter, r, 0);
 533 }
 534
 535 void ParamTraits<base::ListValue>::Log(const param_type& p, std::string* l) {
 536   std::string json;
 537   base::JSONWriter::Write(&p, &json);
 538   l->append(json);
 539 }
 540
 541 void ParamTraits<base::NullableString16>::Write(Message* m,
 542                                                 const param_type& p) {
 543   WriteParam(m, p.string());
 544   WriteParam(m, p.is_null());
 545 }
 546
 547 bool ParamTraits<base::NullableString16>::Read(const Message* m,
 548                                                PickleIterator* iter,
 549                                                param_type* r) {
 550   base::string16 string;
 551   if (!ReadParam(m, iter, &string))
 552     return false;
 553   bool is_null;
 554   if (!ReadParam(m, iter, &is_null))
 555     return false;
 556   *r = base::NullableString16(string, is_null);
 557   return true;
 558 }
 559
 560 void ParamTraits<base::NullableString16>::Log(const param_type& p,
 561                                               std::string* l) {
 562   l->append("(");
 563   LogParam(p.string(), l);
 564   l->append(", ");
 565   LogParam(p.is_null(), l);
 566   l->append(")");
 567 }
 568
 569 void ParamTraits<base::File::Info>::Write(Message* m,
 570                                           const param_type& p) {
 571   WriteParam(m, p.size);
 572   WriteParam(m, p.is_directory);
 573   WriteParam(m, p.last_modified.ToDoubleT());
 574   WriteParam(m, p.last_accessed.ToDoubleT());
 575   WriteParam(m, p.creation_time.ToDoubleT());
 576 }
 577
 578 bool ParamTraits<base::File::Info>::Read(const Message* m,
 579                                          PickleIterator* iter,
 580                                          param_type* p) {
 581   double last_modified, last_accessed, creation_time;
 582   if (!ReadParam(m, iter, &p->size) ||
 583       !ReadParam(m, iter, &p->is_directory) ||
 584       !ReadParam(m, iter, &last_modified) ||
 585       !ReadParam(m, iter, &last_accessed) ||
 586       !ReadParam(m, iter, &creation_time))
 587     return false;
 588   p->last_modified = base::Time::FromDoubleT(last_modified);
 589   p->last_accessed = base::Time::FromDoubleT(last_accessed);
 590   p->creation_time = base::Time::FromDoubleT(creation_time);
 591   return true;
 592 }
 593
 594 void ParamTraits<base::File::Info>::Log(const param_type& p,
 595                                         std::string* l) {
 596   l->append("(");
 597   LogParam(p.size, l);
 598   l->append(",");
 599   LogParam(p.is_directory, l);
 600   l->append(",");
 601   LogParam(p.last_modified.ToDoubleT(), l);
 602   l->append(",");
 603   LogParam(p.last_accessed.ToDoubleT(), l);
 604   l->append(",");
 605   LogParam(p.creation_time.ToDoubleT(), l);
 606   l->append(")");
 607 }
 608
 609 void ParamTraits<base::Time>::Write(Message* m, const param_type& p) {
 610   ParamTraits<int64>::Write(m, p.ToInternalValue());
 611 }
 612
 613 bool ParamTraits<base::Time>::Read(const Message* m, PickleIterator* iter,
 614                                    param_type* r) {
 615   int64 value;
 616   if (!ParamTraits<int64>::Read(m, iter, &value))
 617     return false;
 618   *r = base::Time::FromInternalValue(value);
 619   return true;
 620 }
 621
 622 void ParamTraits<base::Time>::Log(const param_type& p, std::string* l) {
 623   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 624 }
 625
 626 void ParamTraits<base::TimeDelta>::Write(Message* m, const param_type& p) {
 627   ParamTraits<int64>::Write(m, p.ToInternalValue());
 628 }
 629
 630 bool ParamTraits<base::TimeDelta>::Read(const Message* m,
 631                                         PickleIterator* iter,
 632                                         param_type* r) {
 633   int64 value;
 634   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 635   if (ret)
 636     *r = base::TimeDelta::FromInternalValue(value);
 637
 638   return ret;
 639 }
 640
 641 void ParamTraits<base::TimeDelta>::Log(const param_type& p, std::string* l) {
 642   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 643 }
 644
 645 void ParamTraits<base::TimeTicks>::Write(Message* m, const param_type& p) {
 646   ParamTraits<int64>::Write(m, p.ToInternalValue());
 647 }
 648
 649 bool ParamTraits<base::TimeTicks>::Read(const Message* m,
 650                                         PickleIterator* iter,
 651                                         param_type* r) {
 652   int64 value;
 653   bool ret = ParamTraits<int64>::Read(m, iter, &value);
 654   if (ret)
 655     *r = base::TimeTicks::FromInternalValue(value);
 656
 657   return ret;
 658 }
 659
 660 void ParamTraits<base::TimeTicks>::Log(const param_type& p, std::string* l) {
 661   ParamTraits<int64>::Log(p.ToInternalValue(), l);
 662 }
 663
 664 void ParamTraits<IPC::ChannelHandle>::Write(Message* m, const param_type& p) {
 665 #if defined(OS_WIN)
 666   // On Windows marshalling pipe handle is not supported.
 667   DCHECK(p.pipe.handle == NULL);
 668 #endif  // defined (OS_WIN)
 669   WriteParam(m, p.name);
 670 #if defined(OS_POSIX)
 671   WriteParam(m, p.socket);
 672 #endif
 673 }
 674
 675 bool ParamTraits<IPC::ChannelHandle>::Read(const Message* m,
 676                                            PickleIterator* iter,
 677                                            param_type* r) {
 678   return ReadParam(m, iter, &r->name)
 679 #if defined(OS_POSIX)
 680       && ReadParam(m, iter, &r->socket)
 681 #endif
 682       ;
 683 }
 684
 685 void ParamTraits<IPC::ChannelHandle>::Log(const param_type& p,
 686                                           std::string* l) {
 687   l->append(base::StringPrintf("ChannelHandle(%s", p.name.c_str()));
 688 #if defined(OS_POSIX)
 689   l->append(", ");
 690   ParamTraits<base::FileDescriptor>::Log(p.socket, l);
 691 #endif
 692   l->append(")");
 693 }
 694
 695 void ParamTraits<LogData>::Write(Message* m, const param_type& p) {
 696   WriteParam(m, p.channel);
 697   WriteParam(m, p.routing_id);
 698   WriteParam(m, p.type);
 699   WriteParam(m, p.flags);
 700   WriteParam(m, p.sent);
 701   WriteParam(m, p.receive);
 702   WriteParam(m, p.dispatch);
 703   WriteParam(m, p.message_name);
 704   WriteParam(m, p.params);
 705 }
 706
 707 bool ParamTraits<LogData>::Read(const Message* m,
 708                                 PickleIterator* iter,
 709                                 param_type* r) {
 710   return
 711       ReadParam(m, iter, &r->channel) &&
 712       ReadParam(m, iter, &r->routing_id) &&
 713       ReadParam(m, iter, &r->type) &&
 714       ReadParam(m, iter, &r->flags) &&
 715       ReadParam(m, iter, &r->sent) &&
 716       ReadParam(m, iter, &r->receive) &&
 717       ReadParam(m, iter, &r->dispatch) &&
 718       ReadParam(m, iter, &r->message_name) &&
 719       ReadParam(m, iter, &r->params);
 720 }
 721
 722 void ParamTraits<LogData>::Log(const param_type& p, std::string* l) {
 723   // Doesn't make sense to implement this!
 724 }
 725
 726 void ParamTraits<Message>::Write(Message* m, const Message& p) {
 727 #if defined(OS_POSIX)
 728   // We don't serialize the file descriptors in the nested message, so there
 729   // better not be any.
 730   DCHECK(!p.HasFileDescriptors());
 731 #endif
 732
 733   // Don't just write out the message. This is used to send messages between
 734   // NaCl (Posix environment) and the browser (could be on Windows). The message
 735   // header formats differ between these systems (so does handle sharing, but
 736   // we already asserted we don't have any handles). So just write out the
 737   // parts of the header we use.
 738   //
 739   // Be careful also to use only explicitly-sized types. The NaCl environment
 740   // could be 64-bit and the host browser could be 32-bits. The nested message
 741   // may or may not be safe to send between 32-bit and 64-bit systems, but we
 742   // leave that up to the code sending the message to ensure.
 743   m->WriteUInt32(static_cast<uint32>(p.routing_id()));
 744   m->WriteUInt32(p.type());
 745   m->WriteUInt32(p.flags());
 746   m->WriteData(p.payload(), static_cast<uint32>(p.payload_size()));
 747 }
 748
 749 bool ParamTraits<Message>::Read(const Message* m, PickleIterator* iter,
 750                                 Message* r) {
 751   uint32 routing_id, type, flags;
 752   if (!m->ReadUInt32(iter, &routing_id) ||
 753       !m->ReadUInt32(iter, &type) ||
 754       !m->ReadUInt32(iter, &flags))
 755     return false;
 756
 757   int payload_size;
 758   const char* payload;
 759   if (!m->ReadData(iter, &payload, &payload_size))
 760     return false;
 761
 762   r->SetHeaderValues(static_cast<int32>(routing_id), type, flags);
 763   return r->WriteBytes(payload, payload_size);
 764 }
 765
 766 void ParamTraits<Message>::Log(const Message& p, std::string* l) {
 767   l->append("<IPC::Message>");
 768 }
 769
 770 #if defined(OS_WIN)
 771 // Note that HWNDs/HANDLE/HCURSOR/HACCEL etc are always 32 bits, even on 64
 772 // bit systems. That's why we use the Windows macros to convert to 32 bits.
 773 void ParamTraits<HANDLE>::Write(Message* m, const param_type& p) {
 774   m->WriteInt(HandleToLong(p));
 775 }
 776
 777 bool ParamTraits<HANDLE>::Read(const Message* m, PickleIterator* iter,
 778                                param_type* r) {
 779   int32 temp;
 780   if (!m->ReadInt(iter, &temp))
 781     return false;
 782   *r = LongToHandle(temp);
 783   return true;
 784 }
 785
 786 void ParamTraits<HANDLE>::Log(const param_type& p, std::string* l) {
 787   l->append(base::StringPrintf("0x%X", p));
 788 }
 789
 790 void ParamTraits<LOGFONT>::Write(Message* m, const param_type& p) {
 791   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(LOGFONT));
 792 }
 793
 794 bool ParamTraits<LOGFONT>::Read(const Message* m, PickleIterator* iter,
 795                                 param_type* r) {
 796   const char *data;
 797   int data_size = 0;
 798   if (m->ReadData(iter, &data, &data_size) && data_size == sizeof(LOGFONT)) {
 799     const LOGFONT *font = reinterpret_cast<LOGFONT*>(const_cast<char*>(data));
 800     if (_tcsnlen(font->lfFaceName, LF_FACESIZE) < LF_FACESIZE) {
 801       memcpy(r, data, sizeof(LOGFONT));
 802       return true;
 803     }
 804   }
 805
 806   NOTREACHED();
 807   return false;
 808 }
 809
 810 void ParamTraits<LOGFONT>::Log(const param_type& p, std::string* l) {
 811   l->append(base::StringPrintf("<LOGFONT>"));
 812 }
 813
 814 void ParamTraits<MSG>::Write(Message* m, const param_type& p) {
 815   m->WriteData(reinterpret_cast<const char*>(&p), sizeof(MSG));
 816 }
 817
 818 bool ParamTraits<MSG>::Read(const Message* m, PickleIterator* iter,
 819                             param_type* r) {
 820   const char *data;
 821   int data_size = 0;
 822   bool result = m->ReadData(iter, &data, &data_size);
 823   if (result && data_size == sizeof(MSG)) {
 824     memcpy(r, data, sizeof(MSG));
 825   } else {
 826     result = false;
 827     NOTREACHED();
 828   }
 829
 830   return result;
 831 }
 832
 833 void ParamTraits<MSG>::Log(const param_type& p, std::string* l) {
 834   l->append("<MSG>");
 835 }
 836
 837 #endif  // OS_WIN
 838
 839 }  // namespace IPC