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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "components/services/storage/indexed_db/scopes/leveldb_scopes_coding.h"
#include <sstream>
#include <string_view>
#include <utility>
#include "base/check.h"
#include "base/check_op.h"
#include "base/containers/span.h"
#include "base/numerics/byte_conversions.h"
#include "components/services/storage/indexed_db/scopes/varint_coding.h"
namespace content::indexed_db {
namespace {
void EncodeBigEndianFixed64(uint64_t number, std::string* output) {
DCHECK(output);
size_t start_index = output->size();
output->resize(output->size() + sizeof(uint64_t));
base::as_writable_byte_span(*output)
.subspan(start_index)
.copy_from(base::U64ToBigEndian(number));
}
std::string_view MakeStringView(base::span<const uint8_t> bytes) {
return std::string_view(reinterpret_cast<const char*>(bytes.data()),
bytes.size());
}
} // namespace
namespace leveldb_scopes {
std::tuple<bool, int64_t> ParseScopeMetadataId(
leveldb::Slice key,
base::span<const uint8_t> scopes_prefix) {
size_t prefix_size = scopes_prefix.size() + /*sizeof(kScopesMetadataByte)=*/1;
// The key must be larger than the prefix.
if (key.size() <= prefix_size)
return std::make_tuple(false, 0);
// The key must start with the prefix.
if (!key.starts_with(
leveldb::Slice(reinterpret_cast<const char*>(scopes_prefix.data()),
scopes_prefix.size())))
return std::make_tuple(false, 0);
// The metadata byte must be correct.
if (key[scopes_prefix.size()] != kScopesMetadataByte)
return std::make_tuple(false, 0);
int64_t scope_id = 0;
std::string_view part(key.data() + prefix_size, key.size() - prefix_size);
bool decode_success = DecodeVarInt(&part, &scope_id);
DCHECK_GE(scope_id, 0);
return std::make_tuple(decode_success, scope_id);
}
std::string KeyToDebugString(base::span<const uint8_t> key_without_prefix) {
std::stringstream result;
result << "{";
if (key_without_prefix.empty()) {
result << "<Empty Scopes Key>}";
return result.str();
}
char type_byte = key_without_prefix[0];
std::string_view key_after_type =
MakeStringView(key_without_prefix.subspan<1>());
switch (type_byte) {
case kGlobalMetadataByte:
result << "GlobalMetadata";
break;
case kScopesMetadataByte: {
result << "ScopesMetadataByte, scope: ";
if (key_without_prefix.empty()) {
result << "<No Scope Number>";
break;
}
int64_t scope_id = 0;
if (!DecodeVarInt(&key_after_type, &scope_id)) {
result << "<Invalid Scope Number>";
break;
}
result << scope_id;
break;
}
case kLogByte: {
result << "LogByte, scope: ";
if (key_without_prefix.empty()) {
result << "<No Scope Number>";
break;
}
int64_t scope_id = 0;
if (!DecodeVarInt(&key_after_type, &scope_id)) {
result << "<Invalid Scope Number>, <Error>";
break;
}
result << scope_id << ", seq_num: ";
int64_t seq_num = 0;
if (key_after_type.size() < sizeof(seq_num)) {
result << "<Invalid Seq Num>";
break;
}
seq_num = base::U64FromBigEndian(
base::as_byte_span(key_after_type).first<8u>());
result << seq_num;
break;
}
}
result << "}";
return result.str();
}
} // namespace leveldb_scopes
leveldb::Slice ScopesEncoder::GlobalMetadataKey(
base::span<const uint8_t> scopes_prefix) {
key_buffer_.clear();
key_buffer_.assign(reinterpret_cast<const char*>(scopes_prefix.data()),
scopes_prefix.size());
key_buffer_.push_back(leveldb_scopes::kGlobalMetadataByte);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::ScopeMetadataKey(
base::span<const uint8_t> scopes_prefix,
int64_t scope_number) {
key_buffer_.clear();
key_buffer_.assign(reinterpret_cast<const char*>(scopes_prefix.data()),
scopes_prefix.size());
key_buffer_.push_back(leveldb_scopes::kScopesMetadataByte);
DCHECK_GE(scope_number, 0);
EncodeVarInt(static_cast<uint64_t>(scope_number), &key_buffer_);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::ScopeMetadataPrefix(
base::span<const uint8_t> scopes_prefix) {
key_buffer_.clear();
key_buffer_.assign(reinterpret_cast<const char*>(scopes_prefix.data()),
scopes_prefix.size());
key_buffer_.push_back(leveldb_scopes::kScopesMetadataByte);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::TasksKeyPrefix(base::span<const uint8_t> prefix) {
key_buffer_.clear();
key_buffer_.assign(reinterpret_cast<const char*>(prefix.data()),
prefix.size());
key_buffer_.push_back(leveldb_scopes::kLogByte);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::TasksKeyPrefix(base::span<const uint8_t> prefix,
int64_t scope_number) {
key_buffer_.clear();
key_buffer_.assign(reinterpret_cast<const char*>(prefix.data()),
prefix.size());
key_buffer_.push_back(leveldb_scopes::kLogByte);
DCHECK_GE(scope_number, 0);
EncodeVarInt(static_cast<uint64_t>(scope_number), &key_buffer_);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::UndoTaskKeyPrefix(
base::span<const uint8_t> prefix,
int64_t scope_number) {
key_buffer_.clear();
key_buffer_.assign(reinterpret_cast<const char*>(prefix.data()),
prefix.size());
key_buffer_.push_back(leveldb_scopes::kLogByte);
DCHECK_GE(scope_number, 0);
EncodeVarInt(static_cast<uint64_t>(scope_number), &key_buffer_);
key_buffer_.push_back(leveldb_scopes::kUndoTasksByte);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::CleanupTaskKeyPrefix(
base::span<const uint8_t> prefix,
int64_t scope_number) {
key_buffer_.clear();
key_buffer_.assign(reinterpret_cast<const char*>(prefix.data()),
prefix.size());
key_buffer_.push_back(leveldb_scopes::kLogByte);
DCHECK_GE(scope_number, 0);
EncodeVarInt(static_cast<uint64_t>(scope_number), &key_buffer_);
key_buffer_.push_back(leveldb_scopes::kCleanupTasksByte);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::UndoTaskKey(
base::span<const uint8_t> scopes_prefix,
int64_t scope_number,
int64_t undo_sequence_number) {
UndoTaskKeyPrefix(scopes_prefix, scope_number);
EncodeBigEndianFixed64(undo_sequence_number, &key_buffer_);
return leveldb::Slice(key_buffer_);
}
leveldb::Slice ScopesEncoder::CleanupTaskKey(
base::span<const uint8_t> scopes_prefix,
int64_t scope_number,
int64_t cleanup_sequence_number) {
CleanupTaskKeyPrefix(scopes_prefix, scope_number);
EncodeBigEndianFixed64(cleanup_sequence_number, &key_buffer_);
return leveldb::Slice(key_buffer_);
}
} // namespace content::indexed_db
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