119 lines
5.0 KiB
C++
119 lines
5.0 KiB
C++
#include "DirEntry.h"
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using std::vector;
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using std::string;
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using blockstore::BlockId;
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namespace cryfs {
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namespace fsblobstore {
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void DirEntry::serialize(uint8_t *dest) const {
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ASSERT(
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((_type == fspp::Dir::EntryType::FILE) && S_ISREG(_mode) && !S_ISDIR(_mode) && !S_ISLNK(_mode)) ||
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((_type == fspp::Dir::EntryType::DIR) && !S_ISREG(_mode) && S_ISDIR(_mode) && !S_ISLNK(_mode)) ||
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((_type == fspp::Dir::EntryType::SYMLINK) && !S_ISREG(_mode) && !S_ISDIR(_mode) && S_ISLNK(_mode))
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, "Wrong mode bit set for this type: " + std::to_string(_mode & S_IFREG) + ", " + std::to_string(
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_mode & S_IFDIR) + ", " + std::to_string(_mode & S_IFLNK) + ", " + std::to_string(static_cast<uint8_t>(_type))
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);
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unsigned int offset = 0;
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offset += _serializeUint8(dest + offset, static_cast<uint8_t>(_type));
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offset += _serializeUint32(dest + offset, _mode);
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offset += _serializeUint32(dest + offset, _uid);
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offset += _serializeUint32(dest + offset, _gid);
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offset += _serializeTimeValue(dest + offset, _lastAccessTime);
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offset += _serializeTimeValue(dest + offset, _lastModificationTime);
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offset += _serializeTimeValue(dest + offset, _lastMetadataChangeTime);
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offset += _serializeString(dest + offset, _name);
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offset += _serializeBlockId(dest + offset, _blockId);
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ASSERT(offset == serializedSize(), "Didn't write correct number of elements");
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}
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const char *DirEntry::deserializeAndAddToVector(const char *pos, vector<DirEntry> *result) {
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fspp::Dir::EntryType type = static_cast<fspp::Dir::EntryType>(_deserializeUint8(&pos));
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mode_t mode = _deserializeUint32(&pos);
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uid_t uid = _deserializeUint32(&pos);
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gid_t gid = _deserializeUint32(&pos);
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timespec lastAccessTime = _deserializeTimeValue(&pos);
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timespec lastModificationTime = _deserializeTimeValue(&pos);
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timespec lastMetadataChangeTime = _deserializeTimeValue(&pos);
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string name = _deserializeString(&pos);
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BlockId blockId = _deserializeBlockId(&pos);
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result->emplace_back(type, name, blockId, mode, uid, gid, lastAccessTime, lastModificationTime, lastMetadataChangeTime);
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return pos;
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}
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unsigned int DirEntry::_serializeTimeValue(uint8_t *dest, timespec value) {
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unsigned int offset = 0;
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*reinterpret_cast<uint64_t*>(dest+offset) = value.tv_sec;
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offset += sizeof(uint64_t);
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*reinterpret_cast<uint32_t*>(dest+offset) = value.tv_nsec;
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offset += sizeof(uint32_t);
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ASSERT(offset == _serializedTimeValueSize(), "serialized to wrong size");
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return offset;
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}
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size_t DirEntry::_serializedTimeValueSize() {
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return sizeof(uint64_t) + sizeof(uint32_t);
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}
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timespec DirEntry::_deserializeTimeValue(const char **pos) {
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timespec value{};
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value.tv_sec = *(uint64_t*)(*pos);
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*pos += sizeof(uint64_t);
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value.tv_nsec = *(uint32_t*)(*pos);
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*pos += sizeof(uint32_t);
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return value;
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}
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unsigned int DirEntry::_serializeUint8(uint8_t *dest, uint8_t value) {
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*reinterpret_cast<uint8_t*>(dest) = value;
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return sizeof(uint8_t);
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}
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uint8_t DirEntry::_deserializeUint8(const char **pos) {
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uint8_t value = *(uint8_t*)(*pos);
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*pos += sizeof(uint8_t);
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return value;
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}
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unsigned int DirEntry::_serializeUint32(uint8_t *dest, uint32_t value) {
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*reinterpret_cast<uint32_t*>(dest) = value;
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return sizeof(uint32_t);
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}
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uint32_t DirEntry::_deserializeUint32(const char **pos) {
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uint32_t value = *(uint32_t*)(*pos);
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*pos += sizeof(uint32_t);
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return value;
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}
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unsigned int DirEntry::_serializeString(uint8_t *dest, const string &value) {
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std::memcpy(dest, value.c_str(), value.size()+1);
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return value.size() + 1;
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}
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string DirEntry::_deserializeString(const char **pos) {
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size_t length = strlen(*pos);
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string value(*pos, length);
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*pos += length + 1;
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return value;
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}
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unsigned int DirEntry::_serializeBlockId(uint8_t *dest, const BlockId &blockId) {
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blockId.ToBinary(dest);
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return blockId.BINARY_LENGTH;
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}
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BlockId DirEntry::_deserializeBlockId(const char **pos) {
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BlockId blockId = BlockId::FromBinary(*pos);
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*pos += BlockId::BINARY_LENGTH;
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return blockId;
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}
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size_t DirEntry::serializedSize() const {
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return 1 + sizeof(uint32_t) + sizeof(uint32_t) + sizeof(uint32_t) + 3*_serializedTimeValueSize() + (
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_name.size() + 1) + _blockId.BINARY_LENGTH;
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}
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}
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}
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