static bool ext4_sb_verify_csum(struct ext4_sblock *s)
{
if (!ext4_sb_feature_ro_com(s, EXT4_FRO_COM_METADATA_CSUM))
return true;
if (s->checksum_type != to_le32(EXT4_CHECKSUM_CRC32C))
return false;
return s->checksum == to_le32(ext4_sb_csum(s));
}
static void
ext4_dir_set_dx_checksum(struct ext4_inode_ref *inode_ref,
struct ext4_directory_entry_ll *dirent)
{
int count_offset, limit, count;
struct ext4_sblock *sb = &inode_ref->fs->sb;
if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
struct ext4_directory_dx_countlimit *countlimit =
ext4_dir_dx_get_countlimit(inode_ref, dirent, &count_offset);
if (!countlimit) {
/* Directory seems corrupted. */
return;
}
struct ext4_directory_dx_tail *t;
limit = ext4_dir_dx_countlimit_get_limit(countlimit);
count = ext4_dir_dx_countlimit_get_count(countlimit);
if (count_offset + (limit * sizeof(struct ext4_directory_dx_entry)) >
ext4_sb_get_block_size(sb) -
sizeof(struct ext4_directory_dx_tail)) {
/* There is no space to hold the checksum */
return;
}
t = (struct ext4_directory_dx_tail *)
(((struct ext4_directory_dx_entry *)countlimit) + limit);
t->checksum =
to_le32(ext4_dir_dx_checksum(inode_ref, dirent, count_offset, count, t));
}
}
static void ext4_sb_set_csum(struct ext4_sblock *s)
{
if (!ext4_sb_feature_ro_com(s, EXT4_FRO_COM_METADATA_CSUM))
return;
s->checksum = to_le32(ext4_sb_csum(s));
}
void CFilePacker::Write(const VfsPath& filename)
{
const size_t payloadSize = m_writeBuffer.Size() - sizeof(FileHeader);
const u32 payloadSize_le = to_le32(u32_from_larger(payloadSize));
m_writeBuffer.Overwrite(&payloadSize_le, sizeof(payloadSize_le), 0+offsetof(FileHeader, payloadSize_le));
// write out all data (including header)
if(g_VFS->CreateFile(filename, m_writeBuffer.Data(), m_writeBuffer.Size()) < 0)
throw PSERROR_File_WriteFailed();
}
void IDeserializer::NumberI32(const char* name, int32_t& out, int32_t lower, int32_t upper)
{
int32_t value;
Get(name, (u8*)&value, sizeof(uint32_t));
value = (i32)to_le32((u32)value);
if (!(lower <= value && value <= upper))
throw PSERROR_Deserialize_OutOfBounds(name);
out = value;
}
static uint32_t
ext4_dir_dx_checksum(struct ext4_inode_ref *inode_ref,
void *dirent,
int count_offset, int count, struct ext4_directory_dx_tail *t)
{
uint32_t orig_checksum, checksum = 0;
struct ext4_sblock *sb = &inode_ref->fs->sb;
int size;
/* Compute the checksum only if the filesystem supports it */
if (ext4_sb_feature_ro_com(sb, EXT4_FRO_COM_METADATA_CSUM)) {
uint32_t ino_index = to_le32(inode_ref->index);
uint32_t ino_gen =
to_le32(ext4_inode_get_generation(inode_ref->inode));
size = count_offset +
(count * sizeof(struct ext4_directory_dx_tail));
orig_checksum = t->checksum;
t->checksum = 0;
/* First calculate crc32 checksum against fs uuid */
checksum = ext4_crc32c(EXT4_CRC32_INIT, sb->uuid,
sizeof(sb->uuid));
/* Then calculate crc32 checksum against inode number
* and inode generation */
checksum = ext4_crc32c(checksum, &ino_index,
sizeof(ino_index));
checksum = ext4_crc32c(checksum, &ino_gen,
sizeof(ino_gen));
/* After that calculate crc32 checksum against all the dx_entry */
checksum = ext4_crc32c(checksum, dirent, size);
/* Finally calculate crc32 checksum for dx_tail */
checksum = ext4_crc32c(checksum, t,
sizeof(struct ext4_directory_dx_tail));
t->checksum = orig_checksum;
}
return checksum;
}
void CNetClient::LoadFinished()
{
JSContext* cx = GetScriptInterface().GetContext();
JSAutoRequest rq(cx);
if (!m_JoinSyncBuffer.empty())
{
// We're rejoining a game, and just finished loading the initial map,
// so deserialize the saved game state now
std::string state;
DecompressZLib(m_JoinSyncBuffer, state, true);
std::stringstream stream(state);
u32 turn;
stream.read((char*)&turn, sizeof(turn));
turn = to_le32(turn);
LOGMESSAGE("Rejoining client deserializing state at turn %u\n", turn);
bool ok = m_Game->GetSimulation2()->DeserializeState(stream);
ENSURE(ok);
m_ClientTurnManager->ResetState(turn, turn);
JS::RootedValue msg(cx);
GetScriptInterface().Eval("({'type':'netstatus','status':'join_syncing'})", &msg);
PushGuiMessage(msg);
}
else
{
// Connecting at the start of a game, so we'll wait for other players to finish loading
JS::RootedValue msg(cx);
GetScriptInterface().Eval("({'type':'netstatus','status':'waiting_for_players'})", &msg);
PushGuiMessage(msg);
}
CLoadedGameMessage loaded;
loaded.m_CurrentTurn = m_ClientTurnManager->GetCurrentTurn();
SendMessage(&loaded);
}
bool CNetClient::HandleMessage(CNetMessage* message)
{
// Handle non-FSM messages first
Status status = m_Session->GetFileTransferer().HandleMessageReceive(message);
if (status == INFO::OK)
return true;
if (status != INFO::SKIPPED)
return false;
if (message->GetType() == NMT_FILE_TRANSFER_REQUEST)
{
CFileTransferRequestMessage* reqMessage = (CFileTransferRequestMessage*)message;
// TODO: we should support different transfer request types, instead of assuming
// it's always requesting the simulation state
std::stringstream stream;
LOGMESSAGERENDER("Serializing game at turn %u for rejoining player", m_ClientTurnManager->GetCurrentTurn());
u32 turn = to_le32(m_ClientTurnManager->GetCurrentTurn());
stream.write((char*)&turn, sizeof(turn));
bool ok = m_Game->GetSimulation2()->SerializeState(stream);
ENSURE(ok);
// Compress the content with zlib to save bandwidth
// (TODO: if this is still too large, compressing with e.g. LZMA works much better)
std::string compressed;
CompressZLib(stream.str(), compressed, true);
m_Session->GetFileTransferer().StartResponse(reqMessage->m_RequestID, compressed);
return true;
}
// Update FSM
bool ok = Update(message->GetType(), message);
if (!ok)
LOGERROR("Net client: Error running FSM update (type=%d state=%d)", (int)message->GetType(), (int)GetCurrState());
return ok;
}
void IDeserializer::NumberI32_Unbounded(const char* name, int32_t& out)
{
int32_t value;
Get(name, (u8*)&value, sizeof(int32_t));
out = (i32)to_le32((u32)value);
}
void IDeserializer::NumberU32_Unbounded(const char* name, uint32_t& out)
{
uint32_t value;
Get(name, (u8*)&value, sizeof(uint32_t));
out = to_le32(value);
}
uint64_t ext4_extent_get_start(struct ext4_extent *extent)
{
return ((uint64_t)to_le16(extent->start_hi)) << 32 |
((uint64_t)to_le32(extent->start_lo));
}
void ext4_extent_set_first_block(struct ext4_extent *extent, uint32_t iblock)
{
extent->first_block = to_le32(iblock);
}
/**@brief Set block address where child node is located.
* @param entry Pointer to index entry
* @param block Block address of child node
*/
static inline void
ext4_dir_dx_entry_set_block(struct ext4_directory_dx_entry *entry,
uint32_t block)
{
entry->block = to_le32(block);
}
/**@brief Get block address where child node is located.
* @param entry Pointer to index entry
* @return Block address of child node
*/
static inline uint32_t
ext4_dir_dx_entry_get_block(struct ext4_directory_dx_entry *entry)
{
return to_le32(entry->block);
}
/**@brief Set hash value of index entry.
* @param entry Pointer to index entry
* @param hash Hash value
*/
static inline void
ext4_dir_dx_entry_set_hash(struct ext4_directory_dx_entry *entry, uint32_t hash)
{
entry->hash = to_le32(hash);
}
/**@brief Get hash value of index entry.
* @param entry Pointer to index entry
* @return Hash value
*/
static inline uint32_t
ext4_dir_dx_entry_get_hash(struct ext4_directory_dx_entry *entry)
{
return to_le32(entry->hash);
}
void CFilePacker::PackSize(size_t value)
{
const u32 value_le32 = to_le32(u32_from_larger(value));
PackRaw(&value_le32, sizeof(value_le32));
}
uint32_t ext4_extent_get_first_block(struct ext4_extent *extent)
{
return to_le32(extent->first_block);
}
size_t CFileUnpacker::UnpackSize()
{
u32 value_le32;
UnpackRaw(&value_le32, sizeof(value_le32));
return (size_t)to_le32(value_le32);
}
