bool RarVolume::ReadRar5Volume(DiskFile& file)
{
debug("Reading rar5-file %s", *m_filename);
file.Seek(8);
while (!file.Eof())
{
RarBlock block = ReadRar5Block(file);
if (!block.type)
{
return false;
}
if (block.type == RAR5_BLOCK_MAIN)
{
uint64 arcflags;
if (!ReadV(file, &block, &arcflags)) return false;
if (arcflags & RAR5_MAIN_VOLNR)
{
uint64 volnr;
if (!ReadV(file, &block, &volnr)) return false;
m_volumeNo = (uint32)volnr;
}
m_newNaming = true;
m_multiVolume = (arcflags & RAR5_MAIN_ISVOL) != 0;
}
else if (block.type == RAR5_BLOCK_ENCRYPTION)
{
uint64 val;
if (!ReadV(file, &block, &val)) return false;
if (val != 0) return false; // supporting only AES
if (!ReadV(file, &block, &val)) return false;
uint8 kdfCount;
uint8 salt[16];
if (!Read(file, &block, &kdfCount, sizeof(kdfCount))) return false;
if (!Read(file, &block, &salt, sizeof(salt))) return false;
m_encrypted = true;
if (m_password.Empty()) return false;
if (!DecryptRar5Prepare(kdfCount, salt)) return false;
}
else if (block.type == RAR5_BLOCK_FILE)
{
RarFile innerFile;
if (!ReadRar5File(file, block, innerFile)) return false;
m_files.push_back(std::move(innerFile));
}
else if (block.type == RAR5_BLOCK_ENDARC)
{
uint64 endflags;
if (!ReadV(file, &block, &endflags)) return false;
m_hasNextVolume = (endflags & RAR5_ENDARC_NEXTVOL) != 0;
break;
}
else if (block.type < 1 || block.type > 5)
{
// inlvaid block type
return false;
}
uint64 skip = block.trailsize;
if (m_encrypted)
{
skip -= 16 - m_decryptPos;
if (m_decryptPos < 16)
{
skip += skip % 16 > 0 ? 16 - skip % 16 : 0;
m_decryptPos = 16;
}
DecryptFree();
}
if (!file.Seek(skip, DiskFile::soCur))
{
return false;
}
}
return true;
}
bool RarVolume::ReadRar3Volume(DiskFile& file)
{
debug("Reading rar3-file %s", *m_filename);
while (!file.Eof())
{
RarBlock block = ReadRar3Block(file);
if (!block.type)
{
return false;
}
if (block.type == RAR3_BLOCK_MAIN)
{
if (block.flags & RAR3_MAIN_PASSWORD)
{
m_encrypted = true;
if (m_password.Empty()) return false;
}
m_newNaming = block.flags & RAR3_MAIN_NEWNUMBERING;
m_multiVolume = block.flags & RAR3_MAIN_VOLUME;
}
else if (block.type == RAR3_BLOCK_FILE)
{
RarFile innerFile;
if (!ReadRar3File(file, block, innerFile)) return false;
m_files.push_back(std::move(innerFile));
}
else if (block.type == RAR3_BLOCK_ENDARC)
{
if (block.flags & RAR3_ENDARC_DATACRC)
{
if (!Skip(file, &block, 4)) return false;
}
if (block.flags & RAR3_ENDARC_VOLNUMBER)
{
if (!Read32(file, &block, &m_volumeNo)) return false;
m_hasNextVolume = (block.flags & RAR3_ENDARC_NEXTVOL) != 0;
}
break;
}
else if (block.type < 0x72 || block.type > 0x7b)
{
// inlvaid block type
return false;
}
uint64 skip = block.trailsize;
if (m_encrypted)
{
skip -= 16 - m_decryptPos;
m_decryptPos = 16;
DecryptFree();
}
if (!file.Seek(skip, DiskFile::soCur))
{
return false;
}
}
return true;
}
