license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 1 | // Copyright (c) 2006-2008 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. |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 4 | |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 5 | #include "base/pickle.h" |
| 6 | |
maruel@google.com | 825f879 | 2008-08-07 05:35:17 +0900 | [diff] [blame] | 7 | #include <stdlib.h> |
| 8 | |
| 9 | #include <limits> |
| 10 | #include <string> |
| 11 | |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 12 | //------------------------------------------------------------------------------ |
| 13 | |
| 14 | // static |
| 15 | const int Pickle::kPayloadUnit = 64; |
| 16 | |
deanm@google.com | 19650de | 2008-08-13 23:57:51 +0900 | [diff] [blame] | 17 | // We mark a read only pickle with a special capacity_. |
| 18 | static const size_t kCapacityReadOnly = std::numeric_limits<size_t>::max(); |
| 19 | |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 20 | // Payload is uint32 aligned. |
| 21 | |
| 22 | Pickle::Pickle() |
| 23 | : header_(NULL), |
| 24 | header_size_(sizeof(Header)), |
| 25 | capacity_(0), |
| 26 | variable_buffer_offset_(0) { |
| 27 | Resize(kPayloadUnit); |
| 28 | header_->payload_size = 0; |
| 29 | } |
| 30 | |
| 31 | Pickle::Pickle(int header_size) |
| 32 | : header_(NULL), |
| 33 | header_size_(AlignInt(header_size, sizeof(uint32))), |
| 34 | capacity_(0), |
| 35 | variable_buffer_offset_(0) { |
darin@google.com | cf7eff4 | 2008-08-15 10:05:11 +0900 | [diff] [blame] | 36 | DCHECK(static_cast<size_t>(header_size) >= sizeof(Header)); |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 37 | DCHECK(header_size <= kPayloadUnit); |
| 38 | Resize(kPayloadUnit); |
| 39 | header_->payload_size = 0; |
| 40 | } |
| 41 | |
| 42 | Pickle::Pickle(const char* data, int data_len) |
| 43 | : header_(reinterpret_cast<Header*>(const_cast<char*>(data))), |
| 44 | header_size_(data_len - header_->payload_size), |
deanm@google.com | 19650de | 2008-08-13 23:57:51 +0900 | [diff] [blame] | 45 | capacity_(kCapacityReadOnly), |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 46 | variable_buffer_offset_(0) { |
| 47 | DCHECK(header_size_ >= sizeof(Header)); |
| 48 | DCHECK(header_size_ == AlignInt(header_size_, sizeof(uint32))); |
| 49 | } |
| 50 | |
| 51 | Pickle::Pickle(const Pickle& other) |
| 52 | : header_(NULL), |
| 53 | header_size_(other.header_size_), |
| 54 | capacity_(0), |
| 55 | variable_buffer_offset_(other.variable_buffer_offset_) { |
| 56 | size_t payload_size = header_size_ + other.header_->payload_size; |
| 57 | bool resized = Resize(payload_size); |
| 58 | CHECK(resized); // Realloc failed. |
| 59 | memcpy(header_, other.header_, payload_size); |
| 60 | } |
| 61 | |
| 62 | Pickle::~Pickle() { |
deanm@google.com | 19650de | 2008-08-13 23:57:51 +0900 | [diff] [blame] | 63 | if (capacity_ != kCapacityReadOnly) |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 64 | free(header_); |
| 65 | } |
| 66 | |
| 67 | Pickle& Pickle::operator=(const Pickle& other) { |
deanm@google.com | 19650de | 2008-08-13 23:57:51 +0900 | [diff] [blame] | 68 | if (header_size_ != other.header_size_ && capacity_ != kCapacityReadOnly) { |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 69 | free(header_); |
| 70 | header_ = NULL; |
| 71 | header_size_ = other.header_size_; |
| 72 | } |
| 73 | bool resized = Resize(other.header_size_ + other.header_->payload_size); |
| 74 | CHECK(resized); // Realloc failed. |
| 75 | memcpy(header_, other.header_, header_size_ + other.header_->payload_size); |
| 76 | variable_buffer_offset_ = other.variable_buffer_offset_; |
| 77 | return *this; |
| 78 | } |
| 79 | |
| 80 | bool Pickle::ReadBool(void** iter, bool* result) const { |
| 81 | DCHECK(iter); |
| 82 | |
| 83 | int tmp; |
| 84 | if (!ReadInt(iter, &tmp)) |
| 85 | return false; |
| 86 | DCHECK(0 == tmp || 1 == tmp); |
| 87 | *result = tmp ? true : false; |
| 88 | return true; |
| 89 | } |
| 90 | |
| 91 | bool Pickle::ReadInt(void** iter, int* result) const { |
| 92 | DCHECK(iter); |
| 93 | if (!*iter) |
| 94 | *iter = const_cast<char*>(payload()); |
| 95 | |
| 96 | if (!IteratorHasRoomFor(*iter, sizeof(*result))) |
| 97 | return false; |
| 98 | |
| 99 | // TODO(jar) bug 1129285: Pickle should be cleaned up, and not dependent on |
| 100 | // alignment. |
| 101 | // Next line is otherwise the same as: memcpy(result, *iter, sizeof(*result)); |
| 102 | *result = *reinterpret_cast<int*>(*iter); |
| 103 | |
| 104 | UpdateIter(iter, sizeof(*result)); |
| 105 | return true; |
| 106 | } |
| 107 | |
klink@google.com | d7f6003 | 2008-08-23 08:24:54 +0900 | [diff] [blame] | 108 | bool Pickle::ReadLong(void** iter, long* result) const { |
| 109 | DCHECK(iter); |
| 110 | if (!*iter) |
| 111 | *iter = const_cast<char*>(payload()); |
| 112 | |
| 113 | if (!IteratorHasRoomFor(*iter, sizeof(*result))) |
| 114 | return false; |
| 115 | |
| 116 | // TODO(jar) bug 1129285: Pickle should be cleaned up, and not dependent on |
| 117 | // alignment. |
| 118 | memcpy(result, *iter, sizeof(*result)); |
| 119 | |
| 120 | UpdateIter(iter, sizeof(*result)); |
| 121 | return true; |
| 122 | } |
| 123 | |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 124 | bool Pickle::ReadLength(void** iter, int* result) const { |
| 125 | if (!ReadInt(iter, result)) |
| 126 | return false; |
| 127 | return ((*result) >= 0); |
| 128 | } |
| 129 | |
| 130 | bool Pickle::ReadSize(void** iter, size_t* result) const { |
| 131 | DCHECK(iter); |
| 132 | if (!*iter) |
| 133 | *iter = const_cast<char*>(payload()); |
| 134 | |
| 135 | if (!IteratorHasRoomFor(*iter, sizeof(*result))) |
| 136 | return false; |
| 137 | |
| 138 | // TODO(jar) bug 1129285: Pickle should be cleaned up, and not dependent on |
| 139 | // alignment. |
| 140 | // Next line is otherwise the same as: memcpy(result, *iter, sizeof(*result)); |
| 141 | *result = *reinterpret_cast<size_t*>(*iter); |
| 142 | |
| 143 | UpdateIter(iter, sizeof(*result)); |
| 144 | return true; |
| 145 | } |
| 146 | |
| 147 | bool Pickle::ReadInt64(void** iter, int64* result) const { |
| 148 | DCHECK(iter); |
| 149 | if (!*iter) |
| 150 | *iter = const_cast<char*>(payload()); |
| 151 | |
| 152 | if (!IteratorHasRoomFor(*iter, sizeof(*result))) |
| 153 | return false; |
| 154 | |
| 155 | memcpy(result, *iter, sizeof(*result)); |
| 156 | |
| 157 | UpdateIter(iter, sizeof(*result)); |
| 158 | return true; |
| 159 | } |
| 160 | |
| 161 | bool Pickle::ReadIntPtr(void** iter, intptr_t* result) const { |
| 162 | DCHECK(iter); |
| 163 | if (!*iter) |
| 164 | *iter = const_cast<char*>(payload()); |
| 165 | |
| 166 | if (!IteratorHasRoomFor(*iter, sizeof(*result))) |
| 167 | return false; |
| 168 | |
| 169 | memcpy(result, *iter, sizeof(*result)); |
| 170 | |
| 171 | UpdateIter(iter, sizeof(*result)); |
| 172 | return true; |
| 173 | } |
| 174 | |
| 175 | bool Pickle::ReadString(void** iter, std::string* result) const { |
| 176 | DCHECK(iter); |
| 177 | |
| 178 | int len; |
| 179 | if (!ReadLength(iter, &len)) |
| 180 | return false; |
| 181 | if (!IteratorHasRoomFor(*iter, len)) |
| 182 | return false; |
| 183 | |
| 184 | char* chars = reinterpret_cast<char*>(*iter); |
| 185 | result->assign(chars, len); |
| 186 | |
| 187 | UpdateIter(iter, len); |
| 188 | return true; |
| 189 | } |
| 190 | |
| 191 | bool Pickle::ReadWString(void** iter, std::wstring* result) const { |
| 192 | DCHECK(iter); |
| 193 | |
| 194 | int len; |
| 195 | if (!ReadLength(iter, &len)) |
| 196 | return false; |
| 197 | if (!IteratorHasRoomFor(*iter, len * sizeof(wchar_t))) |
| 198 | return false; |
| 199 | |
| 200 | wchar_t* chars = reinterpret_cast<wchar_t*>(*iter); |
| 201 | result->assign(chars, len); |
| 202 | |
| 203 | UpdateIter(iter, len * sizeof(wchar_t)); |
| 204 | return true; |
| 205 | } |
| 206 | |
| 207 | bool Pickle::ReadBytes(void** iter, const char** data, int length) const { |
| 208 | DCHECK(iter); |
| 209 | DCHECK(data); |
| 210 | |
| 211 | if (!IteratorHasRoomFor(*iter, length)) |
| 212 | return false; |
| 213 | |
| 214 | *data = reinterpret_cast<const char*>(*iter); |
| 215 | |
| 216 | UpdateIter(iter, length); |
| 217 | return true; |
| 218 | } |
| 219 | |
| 220 | bool Pickle::ReadData(void** iter, const char** data, int* length) const { |
| 221 | DCHECK(iter); |
| 222 | DCHECK(data); |
| 223 | DCHECK(length); |
| 224 | |
| 225 | if (!ReadLength(iter, length)) |
| 226 | return false; |
| 227 | |
| 228 | return ReadBytes(iter, data, *length); |
| 229 | } |
| 230 | |
| 231 | char* Pickle::BeginWrite(size_t length) { |
| 232 | // write at a uint32-aligned offset from the beginning of the header |
| 233 | size_t offset = AlignInt(header_->payload_size, sizeof(uint32)); |
| 234 | |
| 235 | size_t new_size = offset + length; |
| 236 | if (header_size_ + new_size > capacity_ && !Resize(header_size_ + new_size)) |
| 237 | return NULL; |
| 238 | |
maruel@google.com | 825f879 | 2008-08-07 05:35:17 +0900 | [diff] [blame] | 239 | #ifdef ARCH_CPU_64_BITS |
| 240 | DCHECK_LE(length, std::numeric_limits<uint32>::max()); |
| 241 | #endif |
| 242 | |
| 243 | header_->payload_size = static_cast<uint32>(new_size); |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 244 | return payload() + offset; |
| 245 | } |
| 246 | |
| 247 | void Pickle::EndWrite(char* dest, int length) { |
| 248 | // Zero-pad to keep tools like purify from complaining about uninitialized |
| 249 | // memory. |
| 250 | if (length % sizeof(uint32)) |
| 251 | memset(dest + length, 0, sizeof(uint32) - (length % sizeof(uint32))); |
| 252 | } |
| 253 | |
| 254 | bool Pickle::WriteBytes(const void* data, int data_len) { |
deanm@google.com | 19650de | 2008-08-13 23:57:51 +0900 | [diff] [blame] | 255 | DCHECK(capacity_ != kCapacityReadOnly) << "oops: pickle is readonly"; |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 256 | |
| 257 | char* dest = BeginWrite(data_len); |
| 258 | if (!dest) |
| 259 | return false; |
| 260 | |
| 261 | memcpy(dest, data, data_len); |
| 262 | |
| 263 | EndWrite(dest, data_len); |
| 264 | return true; |
| 265 | } |
| 266 | |
| 267 | bool Pickle::WriteString(const std::string& value) { |
| 268 | if (!WriteInt(static_cast<int>(value.size()))) |
| 269 | return false; |
| 270 | |
| 271 | return WriteBytes(value.data(), static_cast<int>(value.size())); |
| 272 | } |
| 273 | |
| 274 | bool Pickle::WriteWString(const std::wstring& value) { |
| 275 | if (!WriteInt(static_cast<int>(value.size()))) |
| 276 | return false; |
| 277 | |
| 278 | return WriteBytes(value.data(), |
| 279 | static_cast<int>(value.size() * sizeof(value.data()[0]))); |
| 280 | } |
| 281 | |
| 282 | bool Pickle::WriteData(const char* data, int length) { |
| 283 | return WriteInt(length) && WriteBytes(data, length); |
| 284 | } |
| 285 | |
| 286 | char* Pickle::BeginWriteData(int length) { |
darin@google.com | cf7eff4 | 2008-08-15 10:05:11 +0900 | [diff] [blame] | 287 | DCHECK_EQ(variable_buffer_offset_, 0U) << |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 288 | "There can only be one variable buffer in a Pickle"; |
| 289 | |
| 290 | if (!WriteInt(length)) |
| 291 | return false; |
| 292 | |
| 293 | char *data_ptr = BeginWrite(length); |
| 294 | if (!data_ptr) |
| 295 | return NULL; |
| 296 | |
| 297 | variable_buffer_offset_ = |
| 298 | data_ptr - reinterpret_cast<char*>(header_) - sizeof(int); |
| 299 | |
| 300 | // EndWrite doesn't necessarily have to be called after the write operation, |
| 301 | // so we call it here to pad out what the caller will eventually write. |
| 302 | EndWrite(data_ptr, length); |
| 303 | return data_ptr; |
| 304 | } |
| 305 | |
maruel@google.com | a01bb10 | 2008-08-08 02:04:23 +0900 | [diff] [blame] | 306 | void Pickle::TrimWriteData(int new_length) { |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 307 | DCHECK(variable_buffer_offset_ != 0); |
| 308 | |
maruel@google.com | a01bb10 | 2008-08-08 02:04:23 +0900 | [diff] [blame] | 309 | // Fetch the the variable buffer size |
| 310 | int* cur_length = reinterpret_cast<int*>( |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 311 | reinterpret_cast<char*>(header_) + variable_buffer_offset_); |
| 312 | |
maruel@google.com | a01bb10 | 2008-08-08 02:04:23 +0900 | [diff] [blame] | 313 | if (new_length < 0 || new_length > *cur_length) { |
| 314 | NOTREACHED() << "Invalid length in TrimWriteData."; |
| 315 | return; |
deanm@google.com | 8ba9dfb | 2008-08-08 00:18:20 +0900 | [diff] [blame] | 316 | } |
maruel@google.com | a01bb10 | 2008-08-08 02:04:23 +0900 | [diff] [blame] | 317 | |
| 318 | // Update the payload size and variable buffer size |
| 319 | header_->payload_size -= (*cur_length - new_length); |
| 320 | *cur_length = new_length; |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 321 | } |
| 322 | |
| 323 | bool Pickle::Resize(size_t new_capacity) { |
| 324 | new_capacity = AlignInt(new_capacity, kPayloadUnit); |
| 325 | |
| 326 | void* p = realloc(header_, new_capacity); |
| 327 | if (!p) |
| 328 | return false; |
| 329 | |
| 330 | header_ = reinterpret_cast<Header*>(p); |
| 331 | capacity_ = new_capacity; |
| 332 | return true; |
| 333 | } |
| 334 | |
| 335 | // static |
| 336 | const char* Pickle::FindNext(size_t header_size, |
| 337 | const char* start, |
| 338 | const char* end) { |
| 339 | DCHECK(header_size == AlignInt(header_size, sizeof(uint32))); |
darin@google.com | cf7eff4 | 2008-08-15 10:05:11 +0900 | [diff] [blame] | 340 | DCHECK(header_size <= static_cast<size_t>(kPayloadUnit)); |
initial.commit | 3f4a732 | 2008-07-27 06:49:38 +0900 | [diff] [blame] | 341 | |
| 342 | const Header* hdr = reinterpret_cast<const Header*>(start); |
| 343 | const char* payload_base = start + header_size; |
| 344 | const char* payload_end = payload_base + hdr->payload_size; |
| 345 | if (payload_end < payload_base) |
| 346 | return NULL; |
| 347 | |
| 348 | return (payload_end > end) ? NULL : payload_end; |
| 349 | } |
license.bot | f003cfe | 2008-08-24 09:55:55 +0900 | [diff] [blame^] | 350 | |