| // Copyright 2019 The Chromium Authors |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef THIRD_PARTY_BLINK_PUBLIC_COMMON_FONT_UNIQUE_NAME_LOOKUP_FONT_TABLE_PERSISTENCE_H_ |
| #define THIRD_PARTY_BLINK_PUBLIC_COMMON_FONT_UNIQUE_NAME_LOOKUP_FONT_TABLE_PERSISTENCE_H_ |
| |
| #include "base/files/file.h" |
| #include "base/memory/read_only_shared_memory_region.h" |
| #include "third_party/blink/public/common/common_export.h" |
| #include "third_party/blink/public/common/font_unique_name_lookup/font_unique_name_table.pb.h" |
| |
| namespace blink { |
| |
| // Persistence functions for storing to and reading from disk the font table |
| // lookup structure. The storage format is a pickle of a PersistenceHash prefix |
| // computed over the protobuf, followed by a dump of the FontUniqueNameTable |
| // protobuf. The persistence functions ensure that the format is followed, that |
| // persisting stores the checksum and reading validates the checksum. |
| namespace font_table_persistence { |
| |
| // Load a FontUniqueNameTable protobuf from a persistence file, and if the |
| // checksum validates correctly, allocate the MappedReadOnlyRegion and copy the |
| // read ProtoBuf into it. Returns true on success, false on failures such as |
| // inabilitiy to access the file, empty file, incorrect checksum, or failing to |
| // parse the read dump as a FontUniqueNameTable protobuf. |
| bool BLINK_COMMON_EXPORT |
| LoadFromFile(base::FilePath file_path, |
| base::MappedReadOnlyRegion* name_table_region); |
| |
| // Store a FontUniqueNameTable protobuf to a dump file, prefixing the protobuf |
| // dump with a PersistenceHash checksum. Returns true on success, false on |
| // failures such as failing to open the file or failing to write the dump into |
| // it. |
| bool BLINK_COMMON_EXPORT |
| PersistToFile(const base::MappedReadOnlyRegion& name_table_region, |
| base::FilePath file_path); |
| |
| } // namespace font_table_persistence |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_PUBLIC_COMMON_FONT_UNIQUE_NAME_LOOKUP_FONT_TABLE_PERSISTENCE_H_ |
