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Add fast path in fix_formatted_text.

This commit is contained in:
levlam 2021-02-13 22:45:11 +03:00
parent 025cb9b6a4
commit 65b381f7fd
1 changed files with 23 additions and 14 deletions
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37
td/telegram/MessageEntity.cpp
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@ -3753,23 +3753,32 @@ static void merge_new_entities(vector<MessageEntity> &entities, vector<MessageEn
Status fix_formatted_text(string &text, vector<MessageEntity> &entities, bool allow_empty, bool skip_new_entities,
bool skip_bot_commands, bool for_draft) {
if (!check_utf8(text)) {
return Status::Error(400, "Strings must be encoded in UTF-8");
}
for (auto &entity : entities) {
if (entity.offset < 0 || entity.offset > 1000000) {
return Status::Error(400, PSLICE() << "Receive an entity with incorrect offset " << entity.offset);
string result;
if (entities.empty()) {
// fast path
if (!clean_input_string(text)) {
return Status::Error(400, "Strings must be encoded in UTF-8");
}
if (entity.length < 0 || entity.length > 1000000) {
return Status::Error(400, PSLICE() << "Receive an entity with incorrect length " << entity.length);
result = std::move(text);
} else {
if (!check_utf8(text)) {
return Status::Error(400, "Strings must be encoded in UTF-8");
}
for (auto &entity : entities) {
if (entity.offset < 0 || entity.offset > 1000000) {
return Status::Error(400, PSLICE() << "Receive an entity with incorrect offset " << entity.offset);
}
if (entity.length < 0 || entity.length > 1000000) {
return Status::Error(400, PSLICE() << "Receive an entity with incorrect length " << entity.length);
}
}
td::remove_if(entities, [](const MessageEntity &entity) { return entity.length == 0; });
fix_entities(entities);
TRY_RESULT_ASSIGN(result, clean_input_string_with_entities(text, entities));
}
td::remove_if(entities, [](const MessageEntity &entity) { return entity.length == 0; });
fix_entities(entities);
TRY_RESULT(result, clean_input_string_with_entities(text, entities));
// now entities are still sorted by offset and length, but not type,
// because some characters could be deleted and after that some entities begin to share a common end