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chromium / chromium / src / 28b51cf40ee4e5abb3880cf771308ed95a8e325c / . / base / pickle.cc
blob: 5d7c73251e10eea6bcbc58adef5134a4c15b9468 [file] [log] [blame]
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
license.botbf09a502008-08-24 00:55:55[diff] [blame]2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]4
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]5#include "base/pickle.h"
6
thestig@chromium.orgb7a5d992009-10-28 04:21:01[diff] [blame]7#include <algorithm> // for max()
Nick Diego Yamane7676c802022-01-19 19:02:51[diff] [blame]8#include <cstdlib>
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]9#include <limits>
maruel@google.comc9046af2008-08-06 20:35:17[diff] [blame]10
primiano32a7f502015-07-24 20:13:32[diff] [blame]11#include "base/bits.h"
jam03d8a782016-02-10 20:13:39[diff] [blame]12#include "base/numerics/safe_conversions.h"
Justin Schuh91077eab2017-07-24 21:54:56[diff] [blame]13#include "base/numerics/safe_math.h"
avi9b6f42932015-12-26 22:15:14[diff] [blame]14#include "build/build_config.h"
primiano32a7f502015-07-24 20:13:32[diff] [blame]15
brettwa89dd422015-06-03 16:20:14[diff] [blame]16namespace base {
brettw@chromium.org476dafb2013-12-03 00:39:26[diff] [blame]17
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]18// static
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]19const size_t Pickle::kPayloadUnit = 64;
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]20
thestig@chromium.org9193d2f2011-10-10 22:20:33[diff] [blame]21static const size_t kCapacityReadOnly = static_cast<size_t>(-1);
deanm@google.com836061b2008-08-13 14:57:51[diff] [blame]22
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]23PickleIterator::PickleIterator(const Pickle& pickle)
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]24 : payload_(pickle.payload()),
25 read_index_(0),
Nick Diego Yamane7676c802022-01-19 19:02:51[diff] [blame]26 end_index_(pickle.payload_size()) {}
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]27
28template <typename Type>
29inline bool PickleIterator::ReadBuiltinType(Type* result) {
30 const char* read_from = GetReadPointerAndAdvance<Type>();
31 if (!read_from)
32 return false;
avic0279142015-12-04 22:38:52[diff] [blame]33 if (sizeof(Type) > sizeof(uint32_t))
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]34 memcpy(result, read_from, sizeof(*result));
35 else
36 *result = *reinterpret_cast<const Type*>(read_from);
37 return true;
38}
39
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]40inline void PickleIterator::Advance(size_t size) {
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]41 size_t aligned_size = bits::AlignUp(size, sizeof(uint32_t));
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]42 if (end_index_ - read_index_ < aligned_size) {
43 read_index_ = end_index_;
44 } else {
45 read_index_ += aligned_size;
46 }
47}
48
Nick Diego Yamane7676c802022-01-19 19:02:51[diff] [blame]49template <typename Type>
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]50inline const char* PickleIterator::GetReadPointerAndAdvance() {
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]51 if (sizeof(Type) > end_index_ - read_index_) {
52 read_index_ = end_index_;
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]53 return nullptr;
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]54 }
55 const char* current_read_ptr = payload_ + read_index_;
56 Advance(sizeof(Type));
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]57 return current_read_ptr;
58}
59
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]60const char* PickleIterator::GetReadPointerAndAdvance(size_t num_bytes) {
61 if (num_bytes > end_index_ - read_index_) {
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]62 read_index_ = end_index_;
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]63 return nullptr;
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]64 }
65 const char* current_read_ptr = payload_ + read_index_;
66 Advance(num_bytes);
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]67 return current_read_ptr;
68}
69
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]70inline const char* PickleIterator::GetReadPointerAndAdvance(
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]71 size_t num_elements,
halyavin@google.coma15016f2014-06-02 23:23:49[diff] [blame]72 size_t size_element) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]73 // Check for size_t overflow.
74 size_t num_bytes;
Justin Schuh91077eab2017-07-24 21:54:56[diff] [blame]75 if (!CheckMul(num_elements, size_element).AssignIfValid(&num_bytes))
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]76 return nullptr;
Justin Schuh91077eab2017-07-24 21:54:56[diff] [blame]77 return GetReadPointerAndAdvance(num_bytes);
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]78}
79
80bool PickleIterator::ReadBool(bool* result) {
81 return ReadBuiltinType(result);
82}
83
84bool PickleIterator::ReadInt(int* result) {
85 return ReadBuiltinType(result);
86}
87
88bool PickleIterator::ReadLong(long* result) {
jam03d8a782016-02-10 20:13:39[diff] [blame]89 // Always read long as a 64-bit value to ensure compatibility between 32-bit
90 // and 64-bit processes.
91 int64_t result_int64 = 0;
92 if (!ReadBuiltinType(&result_int64))
93 return false;
94 // CHECK if the cast truncates the value so that we know to change this IPC
95 // parameter to use int64_t.
96 *result = base::checked_cast<long>(result_int64);
97 return true;
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]98}
99
avic0279142015-12-04 22:38:52[diff] [blame]100bool PickleIterator::ReadUInt16(uint16_t* result) {
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]101 return ReadBuiltinType(result);
102}
103
avic0279142015-12-04 22:38:52[diff] [blame]104bool PickleIterator::ReadUInt32(uint32_t* result) {
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]105 return ReadBuiltinType(result);
106}
107
avic0279142015-12-04 22:38:52[diff] [blame]108bool PickleIterator::ReadInt64(int64_t* result) {
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]109 return ReadBuiltinType(result);
110}
111
avic0279142015-12-04 22:38:52[diff] [blame]112bool PickleIterator::ReadUInt64(uint64_t* result) {
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]113 return ReadBuiltinType(result);
114}
115
rbyers@chromium.orgb1f61b032012-11-28 15:40:58[diff] [blame]116bool PickleIterator::ReadFloat(float* result) {
piman@chromium.org522fbea2013-11-18 00:50:25[diff] [blame]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;
rbyers@chromium.orgb1f61b032012-11-28 15:40:58[diff] [blame]126}
127
mostynb@opera.com915cc7d2014-07-14 22:50:32[diff] [blame]128bool 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
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]140bool PickleIterator::ReadString(std::string* result) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]141 size_t len;
142 if (!ReadLength(&len))
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]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
brettwa89dd422015-06-03 16:20:14[diff] [blame]152bool PickleIterator::ReadStringPiece(StringPiece* result) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]153 size_t len;
154 if (!ReadLength(&len))
brucedawsoneaa38962015-03-10 01:46:50[diff] [blame]155 return false;
156 const char* read_from = GetReadPointerAndAdvance(len);
157 if (!read_from)
158 return false;
159
brettwa89dd422015-06-03 16:20:14[diff] [blame]160 *result = StringPiece(read_from, len);
brucedawsoneaa38962015-03-10 01:46:50[diff] [blame]161 return true;
162}
163
Jan Wilken Dörrie085b2aa2021-03-12 16:26:57[diff] [blame]164bool PickleIterator::ReadString16(std::u16string* result) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]165 size_t len;
166 if (!ReadLength(&len))
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]167 return false;
Jan Wilken Dörrie677e0c872021-03-10 10:04:38[diff] [blame]168 const char* read_from = GetReadPointerAndAdvance(len, sizeof(char16_t));
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]169 if (!read_from)
170 return false;
171
Jan Wilken Dörrie677e0c872021-03-10 10:04:38[diff] [blame]172 result->assign(reinterpret_cast<const char16_t*>(read_from), len);
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]173 return true;
174}
175
brettwa89dd422015-06-03 16:20:14[diff] [blame]176bool PickleIterator::ReadStringPiece16(StringPiece16* result) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]177 size_t len;
178 if (!ReadLength(&len))
brucedawsoneaa38962015-03-10 01:46:50[diff] [blame]179 return false;
Jan Wilken Dörrie677e0c872021-03-10 10:04:38[diff] [blame]180 const char* read_from = GetReadPointerAndAdvance(len, sizeof(char16_t));
brucedawsoneaa38962015-03-10 01:46:50[diff] [blame]181 if (!read_from)
182 return false;
183
Jan Wilken Dörrie677e0c872021-03-10 10:04:38[diff] [blame]184 *result = StringPiece16(reinterpret_cast<const char16_t*>(read_from), len);
brucedawsoneaa38962015-03-10 01:46:50[diff] [blame]185 return true;
186}
187
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]188bool PickleIterator::ReadData(const char** data, size_t* length) {
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]189 *length = 0;
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]190 *data = nullptr;
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]191
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]192 if (!ReadLength(length))
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]193 return false;
194
195 return ReadBytes(data, *length);
196}
197
Jeremy Roman2d8d7802020-06-11 22:08:20[diff] [blame]198bool PickleIterator::ReadData(base::span<const uint8_t>* data) {
199 const char* ptr;
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]200 size_t length;
Jeremy Roman2d8d7802020-06-11 22:08:20[diff] [blame]201
202 if (!ReadData(&ptr, &length))
203 return false;
204
205 *data = base::as_bytes(base::make_span(ptr, length));
206 return true;
207}
208
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]209bool PickleIterator::ReadBytes(const char** data, size_t length) {
jbates@chromium.orgce208f872012-03-07 20:42:56[diff] [blame]210 const char* read_from = GetReadPointerAndAdvance(length);
211 if (!read_from)
212 return false;
213 *data = read_from;
214 return true;
215}
216
Chris Watkinsbb7211c2017-11-29 07:16:38[diff] [blame]217Pickle::Attachment::Attachment() = default;
rockot502c94f2016-02-03 20:20:16[diff] [blame]218
Chris Watkinsbb7211c2017-11-29 07:16:38[diff] [blame]219Pickle::Attachment::~Attachment() = default;
rockot502c94f2016-02-03 20:20:16[diff] [blame]220
avic0279142015-12-04 22:38:52[diff] [blame]221// Payload is uint32_t aligned.
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]222
223Pickle::Pickle()
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]224 : header_(nullptr),
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]225 header_size_(sizeof(Header)),
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]226 capacity_after_header_(0),
227 write_offset_(0) {
Lei Zhang3901b61b2020-06-30 20:03:09[diff] [blame]228 static_assert(base::bits::IsPowerOfTwo(Pickle::kPayloadUnit),
primiano32a7f502015-07-24 20:13:32[diff] [blame]229 "Pickle::kPayloadUnit must be a power of two");
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]230 Resize(kPayloadUnit);
231 header_->payload_size = 0;
232}
233
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]234Pickle::Pickle(size_t header_size)
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]235 : header_(nullptr),
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]236 header_size_(bits::AlignUp(header_size, sizeof(uint32_t))),
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]237 capacity_after_header_(0),
238 write_offset_(0) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]239 DCHECK_GE(header_size, sizeof(Header));
kushi.p@gmail.comd7a93ad2011-04-22 13:13:07[diff] [blame]240 DCHECK_LE(header_size, kPayloadUnit);
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]241 Resize(kPayloadUnit);
242 header_->payload_size = 0;
243}
244
Raul Tambref191b592019-01-21 23:56:29[diff] [blame]245Pickle::Pickle(const char* data, size_t data_len)
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]246 : header_(reinterpret_cast<Header*>(const_cast<char*>(data))),
rvargas@google.comd87f8e62010-11-15 19:31:23[diff] [blame]247 header_size_(0),
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]248 capacity_after_header_(kCapacityReadOnly),
249 write_offset_(0) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]250 if (data_len >= sizeof(Header))
rvargas@google.comd87f8e62010-11-15 19:31:23[diff] [blame]251 header_size_ = data_len - header_->payload_size;
252
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]253 if (header_size_ > data_len)
rvargas@google.comd87f8e62010-11-15 19:31:23[diff] [blame]254 header_size_ = 0;
255
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]256 if (header_size_ != bits::AlignUp(header_size_, sizeof(uint32_t)))
rvargas@google.comd87f8e62010-11-15 19:31:23[diff] [blame]257 header_size_ = 0;
258
259 // If there is anything wrong with the data, we're not going to use it.
260 if (!header_size_)
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]261 header_ = nullptr;
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]262}
263
264Pickle::Pickle(const Pickle& other)
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]265 : header_(nullptr),
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]266 header_size_(other.header_size_),
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]267 capacity_after_header_(0),
268 write_offset_(other.write_offset_) {
Nick Diego Yamane7676c802022-01-19 19:02:51[diff] [blame]269 if (other.header_) {
270 Resize(other.header_->payload_size);
271 memcpy(header_, other.header_, header_size_ + other.header_->payload_size);
272 }
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]273}
274
275Pickle::~Pickle() {
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]276 if (capacity_after_header_ != kCapacityReadOnly)
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]277 free(header_);
278}
279
280Pickle& Pickle::operator=(const Pickle& other) {
jar@chromium.orgb944f612009-08-07 23:13:35[diff] [blame]281 if (this == &other) {
jar@chromium.orgb944f612009-08-07 23:13:35[diff] [blame]282 return *this;
283 }
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]284 if (capacity_after_header_ == kCapacityReadOnly) {
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]285 header_ = nullptr;
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]286 capacity_after_header_ = 0;
jar@chromium.orgfb6ec9992009-08-03 07:01:47[diff] [blame]287 }
288 if (header_size_ != other.header_size_) {
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]289 free(header_);
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]290 header_ = nullptr;
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]291 header_size_ = other.header_size_;
292 }
Nick Diego Yamane7676c802022-01-19 19:02:51[diff] [blame]293 if (other.header_) {
294 Resize(other.header_->payload_size);
295 memcpy(header_, other.header_,
296 other.header_size_ + other.header_->payload_size);
297 write_offset_ = other.write_offset_;
298 }
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]299 return *this;
300}
301
Daniel Cheng0d89f9222017-09-22 05:05:07[diff] [blame]302void Pickle::WriteString(const StringPiece& value) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]303 WriteData(value.data(), value.size());
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]304}
305
Daniel Cheng0d89f9222017-09-22 05:05:07[diff] [blame]306void Pickle::WriteString16(const StringPiece16& value) {
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]307 WriteInt(checked_cast<int>(value.size()));
308 WriteBytes(value.data(), value.size() * sizeof(char16_t));
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]309}
310
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]311void Pickle::WriteData(const char* data, size_t length) {
312 WriteInt(checked_cast<int>(length));
Daniel Cheng0d89f9222017-09-22 05:05:07[diff] [blame]313 WriteBytes(data, length);
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]314}
315
Peter Kasting28b51cf2022-06-28 15:02:43[diff] [blame^]316void Pickle::WriteBytes(const void* data, size_t length) {
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]317 WriteBytesCommon(data, length);
erg@google.com9989c9bb2011-01-07 20:23:43[diff] [blame]318}
319
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]320void Pickle::Reserve(size_t length) {
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]321 size_t data_len = bits::AlignUp(length, sizeof(uint32_t));
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]322 DCHECK_GE(data_len, length);
erg@google.com9989c9bb2011-01-07 20:23:43[diff] [blame]323#ifdef ARCH_CPU_64_BITS
avic0279142015-12-04 22:38:52[diff] [blame]324 DCHECK_LE(data_len, std::numeric_limits<uint32_t>::max());
erg@google.com9989c9bb2011-01-07 20:23:43[diff] [blame]325#endif
avic0279142015-12-04 22:38:52[diff] [blame]326 DCHECK_LE(write_offset_, std::numeric_limits<uint32_t>::max() - data_len);
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]327 size_t new_size = write_offset_ + data_len;
328 if (new_size > capacity_after_header_)
329 Resize(capacity_after_header_ * 2 + new_size);
erg@google.com9989c9bb2011-01-07 20:23:43[diff] [blame]330}
331
rockot502c94f2016-02-03 20:20:16[diff] [blame]332bool Pickle::WriteAttachment(scoped_refptr<Attachment> attachment) {
333 return false;
334}
335
336bool Pickle::ReadAttachment(base::PickleIterator* iter,
337 scoped_refptr<Attachment>* attachment) const {
338 return false;
339}
340
341bool Pickle::HasAttachments() const {
342 return false;
343}
344
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]345void Pickle::Resize(size_t new_capacity) {
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]346 CHECK_NE(capacity_after_header_, kCapacityReadOnly);
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]347 capacity_after_header_ = bits::AlignUp(new_capacity, kPayloadUnit);
primiano9882cf342015-06-11 21:40:10[diff] [blame]348 void* p = realloc(header_, GetTotalAllocatedSize());
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]349 CHECK(p);
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]350 header_ = reinterpret_cast<Header*>(p);
primiano9882cf342015-06-11 21:40:10[diff] [blame]351}
352
rockot0776a502015-12-17 06:19:49[diff] [blame]353void* Pickle::ClaimBytes(size_t num_bytes) {
354 void* p = ClaimUninitializedBytesInternal(num_bytes);
355 CHECK(p);
356 memset(p, 0, num_bytes);
357 return p;
358}
359
primiano9882cf342015-06-11 21:40:10[diff] [blame]360size_t Pickle::GetTotalAllocatedSize() const {
361 if (capacity_after_header_ == kCapacityReadOnly)
362 return 0;
363 return header_size_ + capacity_after_header_;
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]364}
365
366// static
367const char* Pickle::FindNext(size_t header_size,
368 const char* start,
369 const char* end) {
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]370 size_t pickle_size = 0;
371 if (!PeekNext(header_size, start, end, &pickle_size))
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]372 return nullptr;
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]373
374 if (pickle_size > static_cast<size_t>(end - start))
Ivan Kotenkova16212a52017-11-08 12:37:33[diff] [blame]375 return nullptr;
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]376
377 return start + pickle_size;
378}
379
380// static
381bool Pickle::PeekNext(size_t header_size,
382 const char* start,
383 const char* end,
384 size_t* pickle_size) {
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]385 DCHECK_EQ(header_size, bits::AlignUp(header_size, sizeof(uint32_t)));
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]386 DCHECK_GE(header_size, sizeof(Header));
kushi.p@gmail.comd7a93ad2011-04-22 13:13:07[diff] [blame]387 DCHECK_LE(header_size, static_cast<size_t>(kPayloadUnit));
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]388
halyavin@google.com33a38dd2013-11-01 09:06:26[diff] [blame]389 size_t length = static_cast<size_t>(end - start);
390 if (length < sizeof(Header))
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]391 return false;
glider@chromium.org137d2372011-01-26 13:02:27[diff] [blame]392
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]393 const Header* hdr = reinterpret_cast<const Header*>(start);
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]394 if (length < header_size)
395 return false;
396
Justin Schuh91077eab2017-07-24 21:54:56[diff] [blame]397 // If payload_size causes an overflow, we return maximum possible
398 // pickle size to indicate that.
399 *pickle_size = ClampAdd(header_size, hdr->payload_size);
dskiba6f3790a2015-09-30 17:24:30[diff] [blame]400 return true;
initial.commitd7cae122008-07-26 21:49:38[diff] [blame]401}
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]402
Nick Diego Yamane7676c802022-01-19 19:02:51[diff] [blame]403template <size_t length>
404void Pickle::WriteBytesStatic(const void* data) {
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]405 WriteBytesCommon(data, length);
406}
407
408template void Pickle::WriteBytesStatic<2>(const void* data);
409template void Pickle::WriteBytesStatic<4>(const void* data);
410template void Pickle::WriteBytesStatic<8>(const void* data);
411
rockot0776a502015-12-17 06:19:49[diff] [blame]412inline void* Pickle::ClaimUninitializedBytesInternal(size_t length) {
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]413 DCHECK_NE(kCapacityReadOnly, capacity_after_header_)
414 << "oops: pickle is readonly";
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]415 size_t data_len = bits::AlignUp(length, sizeof(uint32_t));
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]416 DCHECK_GE(data_len, length);
417#ifdef ARCH_CPU_64_BITS
avic0279142015-12-04 22:38:52[diff] [blame]418 DCHECK_LE(data_len, std::numeric_limits<uint32_t>::max());
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]419#endif
avic0279142015-12-04 22:38:52[diff] [blame]420 DCHECK_LE(write_offset_, std::numeric_limits<uint32_t>::max() - data_len);
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]421 size_t new_size = write_offset_ + data_len;
422 if (new_size > capacity_after_header_) {
primiano32a7f502015-07-24 20:13:32[diff] [blame]423 size_t new_capacity = capacity_after_header_ * 2;
424 const size_t kPickleHeapAlign = 4096;
Benoit Lize7b302c42021-02-04 11:20:38[diff] [blame]425 if (new_capacity > kPickleHeapAlign) {
426 new_capacity =
427 bits::AlignUp(new_capacity, kPickleHeapAlign) - kPayloadUnit;
428 }
primiano32a7f502015-07-24 20:13:32[diff] [blame]429 Resize(std::max(new_capacity, new_size));
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]430 }
431
432 char* write = mutable_payload() + write_offset_;
rockot0776a502015-12-17 06:19:49[diff] [blame]433 memset(write + length, 0, data_len - length); // Always initialize padding
avic0279142015-12-04 22:38:52[diff] [blame]434 header_->payload_size = static_cast<uint32_t>(new_size);
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]435 write_offset_ = new_size;
rockot0776a502015-12-17 06:19:49[diff] [blame]436 return write;
437}
438
439inline void Pickle::WriteBytesCommon(const void* data, size_t length) {
440 DCHECK_NE(kCapacityReadOnly, capacity_after_header_)
441 << "oops: pickle is readonly";
442 MSAN_CHECK_MEM_IS_INITIALIZED(data, length);
443 void* write = ClaimUninitializedBytesInternal(length);
444 memcpy(write, data, length);
piman@chromium.orgd1b319fc2013-10-31 04:03:02[diff] [blame]445}
brettwa89dd422015-06-03 16:20:14[diff] [blame]446
447} // namespace base