99 lines
3.9 KiB
C++
99 lines
3.9 KiB
C++
#include "DirEntry.h"
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using std::vector;
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using blockstore::Key;
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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(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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*(dest+offset) = static_cast<uint8_t>(type);
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offset += 1;
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*reinterpret_cast<uint32_t*>(dest+offset) = mode;
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offset += sizeof(uint32_t);
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*reinterpret_cast<uint32_t*>(dest+offset) = uid;
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offset += sizeof(uint32_t);
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*reinterpret_cast<uint32_t*>(dest+offset) = gid;
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offset += sizeof(uint32_t);
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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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std::memcpy(dest+offset, name.c_str(), name.size()+1);
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offset += name.size() + 1;
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key.ToBinary(dest+offset);
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offset += key.BINARY_LENGTH;
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ASSERT(offset == serializedSize(), "Didn't write correct number of elements");
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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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size_t DirEntry::serializedSize() const {
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return 1 + sizeof(uint32_t) + sizeof(uint32_t) + sizeof(uint32_t) + 3*_serializedTimeValueSize() + (name.size() + 1) + key.BINARY_LENGTH;
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}
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const char *DirEntry::deserializeAndAddToVector(const char *pos, vector<DirEntry> *result) {
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// Read type magic number (whether it is a dir, file or symlink)
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fspp::Dir::EntryType type = static_cast<fspp::Dir::EntryType>(*reinterpret_cast<const unsigned char*>(pos));
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pos += 1;
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mode_t mode = *(uint32_t*)pos;
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pos += sizeof(uint32_t);
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uid_t uid = *(uint32_t*)pos;
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pos += sizeof(uint32_t);
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gid_t gid = *(uint32_t*)pos;
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pos += sizeof(uint32_t);
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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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size_t namelength = strlen(pos);
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std::string name(pos, namelength);
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pos += namelength + 1;
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Key key = Key::FromBinary(pos);
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pos += Key::BINARY_LENGTH;
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result->emplace_back(type, name, key, mode, uid, gid, lastAccessTime, lastModificationTime, lastMetadataChangeTime);
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return pos;
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}
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}
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}
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