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| 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 "base/pickle.h" | |
| 6 | |
| 7 #include <stdlib.h> | |
| 8 | |
| 9 #include <algorithm> // for max() | |
| 10 | |
| 11 namespace base { | |
| 12 | |
| 13 // static | |
| 14 const int Pickle::kPayloadUnit = 64; | |
| 15 | |
| 16 static const size_t kCapacityReadOnly = static_cast<size_t>(-1); | |
| 17 | |
| 18 PickleIterator::PickleIterator(const Pickle& pickle) | |
| 19 : payload_(pickle.payload()), | |
| 20 read_index_(0), | |
| 21 end_index_(pickle.payload_size()) { | |
| 22 } | |
| 23 | |
| 24 template <typename Type> | |
| 25 inline bool PickleIterator::ReadBuiltinType(Type* result) { | |
| 26 const char* read_from = GetReadPointerAndAdvance<Type>(); | |
| 27 if (!read_from) | |
| 28 return false; | |
| 29 if (sizeof(Type) > sizeof(uint32)) | |
| 30 memcpy(result, read_from, sizeof(*result)); | |
| 31 else | |
| 32 *result = *reinterpret_cast<const Type*>(read_from); | |
| 33 return true; | |
| 34 } | |
| 35 | |
| 36 inline void PickleIterator::Advance(size_t size) { | |
| 37 size_t aligned_size = AlignInt(size, sizeof(uint32_t)); | |
| 38 if (end_index_ - read_index_ < aligned_size) { | |
| 39 read_index_ = end_index_; | |
| 40 } else { | |
| 41 read_index_ += aligned_size; | |
| 42 } | |
| 43 } | |
| 44 | |
| 45 template<typename Type> | |
| 46 inline const char* PickleIterator::GetReadPointerAndAdvance() { | |
| 47 if (sizeof(Type) > end_index_ - read_index_) { | |
| 48 read_index_ = end_index_; | |
| 49 return NULL; | |
| 50 } | |
| 51 const char* current_read_ptr = payload_ + read_index_; | |
| 52 Advance(sizeof(Type)); | |
| 53 return current_read_ptr; | |
| 54 } | |
| 55 | |
| 56 const char* PickleIterator::GetReadPointerAndAdvance(int num_bytes) { | |
| 57 if (num_bytes < 0 || | |
| 58 end_index_ - read_index_ < static_cast<size_t>(num_bytes)) { | |
| 59 read_index_ = end_index_; | |
| 60 return NULL; | |
| 61 } | |
| 62 const char* current_read_ptr = payload_ + read_index_; | |
| 63 Advance(num_bytes); | |
| 64 return current_read_ptr; | |
| 65 } | |
| 66 | |
| 67 inline const char* PickleIterator::GetReadPointerAndAdvance( | |
| 68 int num_elements, | |
| 69 size_t size_element) { | |
| 70 // Check for int32 overflow. | |
| 71 int64 num_bytes = static_cast<int64>(num_elements) * size_element; | |
| 72 int num_bytes32 = static_cast<int>(num_bytes); | |
| 73 if (num_bytes != static_cast<int64>(num_bytes32)) | |
| 74 return NULL; | |
| 75 return GetReadPointerAndAdvance(num_bytes32); | |
| 76 } | |
| 77 | |
| 78 bool PickleIterator::ReadBool(bool* result) { | |
| 79 return ReadBuiltinType(result); | |
| 80 } | |
| 81 | |
| 82 bool PickleIterator::ReadInt(int* result) { | |
| 83 return ReadBuiltinType(result); | |
| 84 } | |
| 85 | |
| 86 bool PickleIterator::ReadLong(long* result) { | |
| 87 return ReadBuiltinType(result); | |
| 88 } | |
| 89 | |
| 90 bool PickleIterator::ReadUInt16(uint16* result) { | |
| 91 return ReadBuiltinType(result); | |
| 92 } | |
| 93 | |
| 94 bool PickleIterator::ReadUInt32(uint32* result) { | |
| 95 return ReadBuiltinType(result); | |
| 96 } | |
| 97 | |
| 98 bool PickleIterator::ReadInt64(int64* result) { | |
| 99 return ReadBuiltinType(result); | |
| 100 } | |
| 101 | |
| 102 bool PickleIterator::ReadUInt64(uint64* result) { | |
| 103 return ReadBuiltinType(result); | |
| 104 } | |
| 105 | |
| 106 bool PickleIterator::ReadSizeT(size_t* result) { | |
| 107 // Always read size_t as a 64-bit value to ensure compatibility between 32-bit | |
| 108 // and 64-bit processes. | |
| 109 uint64 result_uint64 = 0; | |
| 110 bool success = ReadBuiltinType(&result_uint64); | |
| 111 *result = static_cast<size_t>(result_uint64); | |
| 112 // Fail if the cast above truncates the value. | |
| 113 return success && (*result == result_uint64); | |
| 114 } | |
| 115 | |
| 116 bool PickleIterator::ReadFloat(float* result) { | |
| 117 // crbug.com/315213 | |
| 118 // The source data may not be properly aligned, and unaligned float reads | |
| 119 // cause SIGBUS on some ARM platforms, so force using memcpy to copy the data | |
| 120 // into the result. | |
| 121 const char* read_from = GetReadPointerAndAdvance<float>(); | |
| 122 if (!read_from) | |
| 123 return false; | |
| 124 memcpy(result, read_from, sizeof(*result)); | |
| 125 return true; | |
| 126 } | |
| 127 | |
| 128 bool PickleIterator::ReadDouble(double* result) { | |
| 129 // crbug.com/315213 | |
| 130 // The source data may not be properly aligned, and unaligned double reads | |
| 131 // cause SIGBUS on some ARM platforms, so force using memcpy to copy the data | |
| 132 // into the result. | |
| 133 const char* read_from = GetReadPointerAndAdvance<double>(); | |
| 134 if (!read_from) | |
| 135 return false; | |
| 136 memcpy(result, read_from, sizeof(*result)); | |
| 137 return true; | |
| 138 } | |
| 139 | |
| 140 bool PickleIterator::ReadString(std::string* result) { | |
| 141 int len; | |
| 142 if (!ReadInt(&len)) | |
| 143 return false; | |
| 144 const char* read_from = GetReadPointerAndAdvance(len); | |
| 145 if (!read_from) | |
| 146 return false; | |
| 147 | |
| 148 result->assign(read_from, len); | |
| 149 return true; | |
| 150 } | |
| 151 | |
| 152 bool PickleIterator::ReadStringPiece(StringPiece* result) { | |
| 153 int len; | |
| 154 if (!ReadInt(&len)) | |
| 155 return false; | |
| 156 const char* read_from = GetReadPointerAndAdvance(len); | |
| 157 if (!read_from) | |
| 158 return false; | |
| 159 | |
| 160 *result = StringPiece(read_from, len); | |
| 161 return true; | |
| 162 } | |
| 163 | |
| 164 bool PickleIterator::ReadString16(string16* result) { | |
| 165 int len; | |
| 166 if (!ReadInt(&len)) | |
| 167 return false; | |
| 168 const char* read_from = GetReadPointerAndAdvance(len, sizeof(char16)); | |
| 169 if (!read_from) | |
| 170 return false; | |
| 171 | |
| 172 result->assign(reinterpret_cast<const char16*>(read_from), len); | |
| 173 return true; | |
| 174 } | |
| 175 | |
| 176 bool PickleIterator::ReadStringPiece16(StringPiece16* result) { | |
| 177 int len; | |
| 178 if (!ReadInt(&len)) | |
| 179 return false; | |
| 180 const char* read_from = GetReadPointerAndAdvance(len, sizeof(char16)); | |
| 181 if (!read_from) | |
| 182 return false; | |
| 183 | |
| 184 *result = StringPiece16(reinterpret_cast<const char16*>(read_from), len); | |
| 185 return true; | |
| 186 } | |
| 187 | |
| 188 bool PickleIterator::ReadData(const char** data, int* length) { | |
| 189 *length = 0; | |
| 190 *data = 0; | |
| 191 | |
| 192 if (!ReadInt(length)) | |
| 193 return false; | |
| 194 | |
| 195 return ReadBytes(data, *length); | |
| 196 } | |
| 197 | |
| 198 bool PickleIterator::ReadBytes(const char** data, int length) { | |
| 199 const char* read_from = GetReadPointerAndAdvance(length); | |
| 200 if (!read_from) | |
| 201 return false; | |
| 202 *data = read_from; | |
| 203 return true; | |
| 204 } | |
| 205 | |
| 206 // Payload is uint32 aligned. | |
| 207 | |
| 208 Pickle::Pickle() | |
| 209 : header_(NULL), | |
| 210 header_size_(sizeof(Header)), | |
| 211 capacity_after_header_(0), | |
| 212 write_offset_(0) { | |
| 213 Resize(kPayloadUnit); | |
| 214 header_->payload_size = 0; | |
| 215 } | |
| 216 | |
| 217 Pickle::Pickle(int header_size) | |
| 218 : header_(NULL), | |
| 219 header_size_(AlignInt(header_size, sizeof(uint32))), | |
| 220 capacity_after_header_(0), | |
| 221 write_offset_(0) { | |
| 222 DCHECK_GE(static_cast<size_t>(header_size), sizeof(Header)); | |
| 223 DCHECK_LE(header_size, kPayloadUnit); | |
| 224 Resize(kPayloadUnit); | |
| 225 header_->payload_size = 0; | |
| 226 } | |
| 227 | |
| 228 Pickle::Pickle(const char* data, int data_len) | |
| 229 : header_(reinterpret_cast<Header*>(const_cast<char*>(data))), | |
| 230 header_size_(0), | |
| 231 capacity_after_header_(kCapacityReadOnly), | |
| 232 write_offset_(0) { | |
| 233 if (data_len >= static_cast<int>(sizeof(Header))) | |
| 234 header_size_ = data_len - header_->payload_size; | |
| 235 | |
| 236 if (header_size_ > static_cast<unsigned int>(data_len)) | |
| 237 header_size_ = 0; | |
| 238 | |
| 239 if (header_size_ != AlignInt(header_size_, sizeof(uint32))) | |
| 240 header_size_ = 0; | |
| 241 | |
| 242 // If there is anything wrong with the data, we're not going to use it. | |
| 243 if (!header_size_) | |
| 244 header_ = NULL; | |
| 245 } | |
| 246 | |
| 247 Pickle::Pickle(const Pickle& other) | |
| 248 : header_(NULL), | |
| 249 header_size_(other.header_size_), | |
| 250 capacity_after_header_(0), | |
| 251 write_offset_(other.write_offset_) { | |
| 252 size_t payload_size = header_size_ + other.header_->payload_size; | |
| 253 Resize(payload_size); | |
| 254 memcpy(header_, other.header_, payload_size); | |
| 255 } | |
| 256 | |
| 257 Pickle::~Pickle() { | |
| 258 if (capacity_after_header_ != kCapacityReadOnly) | |
| 259 free(header_); | |
| 260 } | |
| 261 | |
| 262 Pickle& Pickle::operator=(const Pickle& other) { | |
| 263 if (this == &other) { | |
| 264 NOTREACHED(); | |
| 265 return *this; | |
| 266 } | |
| 267 if (capacity_after_header_ == kCapacityReadOnly) { | |
| 268 header_ = NULL; | |
| 269 capacity_after_header_ = 0; | |
| 270 } | |
| 271 if (header_size_ != other.header_size_) { | |
| 272 free(header_); | |
| 273 header_ = NULL; | |
| 274 header_size_ = other.header_size_; | |
| 275 } | |
| 276 Resize(other.header_->payload_size); | |
| 277 memcpy(header_, other.header_, | |
| 278 other.header_size_ + other.header_->payload_size); | |
| 279 write_offset_ = other.write_offset_; | |
| 280 return *this; | |
| 281 } | |
| 282 | |
| 283 bool Pickle::WriteString(const StringPiece& value) { | |
| 284 if (!WriteInt(static_cast<int>(value.size()))) | |
| 285 return false; | |
| 286 | |
| 287 return WriteBytes(value.data(), static_cast<int>(value.size())); | |
| 288 } | |
| 289 | |
| 290 bool Pickle::WriteString16(const StringPiece16& value) { | |
| 291 if (!WriteInt(static_cast<int>(value.size()))) | |
| 292 return false; | |
| 293 | |
| 294 return WriteBytes(value.data(), | |
| 295 static_cast<int>(value.size()) * sizeof(char16)); | |
| 296 } | |
| 297 | |
| 298 bool Pickle::WriteData(const char* data, int length) { | |
| 299 return length >= 0 && WriteInt(length) && WriteBytes(data, length); | |
| 300 } | |
| 301 | |
| 302 bool Pickle::WriteBytes(const void* data, int length) { | |
| 303 WriteBytesCommon(data, length); | |
| 304 return true; | |
| 305 } | |
| 306 | |
| 307 void Pickle::Reserve(size_t length) { | |
| 308 size_t data_len = AlignInt(length, sizeof(uint32)); | |
| 309 DCHECK_GE(data_len, length); | |
| 310 #ifdef ARCH_CPU_64_BITS | |
| 311 DCHECK_LE(data_len, kuint32max); | |
| 312 #endif | |
| 313 DCHECK_LE(write_offset_, kuint32max - data_len); | |
| 314 size_t new_size = write_offset_ + data_len; | |
| 315 if (new_size > capacity_after_header_) | |
| 316 Resize(capacity_after_header_ * 2 + new_size); | |
| 317 } | |
| 318 | |
| 319 void Pickle::Resize(size_t new_capacity) { | |
| 320 CHECK_NE(capacity_after_header_, kCapacityReadOnly); | |
| 321 capacity_after_header_ = AlignInt(new_capacity, kPayloadUnit); | |
| 322 void* p = realloc(header_, GetTotalAllocatedSize()); | |
| 323 CHECK(p); | |
| 324 header_ = reinterpret_cast<Header*>(p); | |
| 325 } | |
| 326 | |
| 327 size_t Pickle::GetTotalAllocatedSize() const { | |
| 328 if (capacity_after_header_ == kCapacityReadOnly) | |
| 329 return 0; | |
| 330 return header_size_ + capacity_after_header_; | |
| 331 } | |
| 332 | |
| 333 // static | |
| 334 const char* Pickle::FindNext(size_t header_size, | |
| 335 const char* start, | |
| 336 const char* end) { | |
| 337 DCHECK_EQ(header_size, AlignInt(header_size, sizeof(uint32))); | |
| 338 DCHECK_LE(header_size, static_cast<size_t>(kPayloadUnit)); | |
| 339 | |
| 340 size_t length = static_cast<size_t>(end - start); | |
| 341 if (length < sizeof(Header)) | |
| 342 return NULL; | |
| 343 | |
| 344 const Header* hdr = reinterpret_cast<const Header*>(start); | |
| 345 if (length < header_size || length - header_size < hdr->payload_size) | |
| 346 return NULL; | |
| 347 return start + header_size + hdr->payload_size; | |
| 348 } | |
| 349 | |
| 350 template <size_t length> void Pickle::WriteBytesStatic(const void* data) { | |
| 351 WriteBytesCommon(data, length); | |
| 352 } | |
| 353 | |
| 354 template void Pickle::WriteBytesStatic<2>(const void* data); | |
| 355 template void Pickle::WriteBytesStatic<4>(const void* data); | |
| 356 template void Pickle::WriteBytesStatic<8>(const void* data); | |
| 357 | |
| 358 inline void Pickle::WriteBytesCommon(const void* data, size_t length) { | |
| 359 DCHECK_NE(kCapacityReadOnly, capacity_after_header_) | |
| 360 << "oops: pickle is readonly"; | |
| 361 MSAN_CHECK_MEM_IS_INITIALIZED(data, length); | |
| 362 size_t data_len = AlignInt(length, sizeof(uint32)); | |
| 363 DCHECK_GE(data_len, length); | |
| 364 #ifdef ARCH_CPU_64_BITS | |
| 365 DCHECK_LE(data_len, kuint32max); | |
| 366 #endif | |
| 367 DCHECK_LE(write_offset_, kuint32max - data_len); | |
| 368 size_t new_size = write_offset_ + data_len; | |
| 369 if (new_size > capacity_after_header_) { | |
| 370 Resize(std::max(capacity_after_header_ * 2, new_size)); | |
| 371 } | |
| 372 | |
| 373 char* write = mutable_payload() + write_offset_; | |
| 374 memcpy(write, data, length); | |
| 375 memset(write + length, 0, data_len - length); | |
| 376 header_->payload_size = static_cast<uint32>(new_size); | |
| 377 write_offset_ = new_size; | |
| 378 } | |
| 379 | |
| 380 } // namespace base | |
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