HRESULT CInArchive::Open(IInStream *stream, const UInt64 *searchHeaderSizeLimit)
{
_inBufMode = false;
Close();
RINOK(stream->Seek(0, STREAM_SEEK_CUR, &m_Position));
RINOK(stream->Seek(0, STREAM_SEEK_END, &ArcInfo.FileEndPos));
RINOK(stream->Seek(m_Position, STREAM_SEEK_SET, NULL));
// printf("\nOpen offset = %d", (int)m_Position);
RINOK(FindAndReadMarker(stream, searchHeaderSizeLimit));
RINOK(stream->Seek(m_Position, STREAM_SEEK_SET, NULL));
Stream = stream;
return S_OK;
}
bool CInArchive::ReadMarkerAndArchiveHeader(const UInt64 *searchHeaderSizeLimit)
{
if (!FindAndReadMarker(searchHeaderSizeLimit))
return false;
Byte buf[NHeader::NArchive::kArchiveHeaderSize];
UInt32 processedSize;
ReadBytes(buf, sizeof(buf), &processedSize);
if (processedSize != sizeof(buf))
return false;
m_CurData = buf;
m_CurPos = 0;
m_PosLimit = sizeof(buf);
m_ArchiveHeader.CRC = ReadUInt16();
m_ArchiveHeader.Type = ReadByte();
m_ArchiveHeader.Flags = ReadUInt16();
m_ArchiveHeader.Size = ReadUInt16();
m_ArchiveHeader.Reserved1 = ReadUInt16();
m_ArchiveHeader.Reserved2 = ReadUInt32();
m_ArchiveHeader.EncryptVersion = 0;
UInt32 crc = CRC_INIT_VAL;
crc = CRC_UPDATE_BYTE(crc, m_ArchiveHeader.Type);
crc = CrcUpdateUInt16(crc, m_ArchiveHeader.Flags);
crc = CrcUpdateUInt16(crc, m_ArchiveHeader.Size);
crc = CrcUpdateUInt16(crc, m_ArchiveHeader.Reserved1);
crc = CrcUpdateUInt32(crc, m_ArchiveHeader.Reserved2);
if (m_ArchiveHeader.IsThereEncryptVer() && m_ArchiveHeader.Size > NHeader::NArchive::kArchiveHeaderSize)
{
ReadBytes(&m_ArchiveHeader.EncryptVersion, 1, &processedSize);
if (processedSize != 1)
return false;
crc = CRC_UPDATE_BYTE(crc, m_ArchiveHeader.EncryptVersion);
}
if(m_ArchiveHeader.CRC != (CRC_GET_DIGEST(crc) & 0xFFFF))
ThrowExceptionWithCode(CInArchiveException::kArchiveHeaderCRCError);
if (m_ArchiveHeader.Type != NHeader::NBlockType::kArchiveHeader)
return false;
m_ArchiveCommentPosition = m_Position;
m_SeekOnArchiveComment = true;
return true;
}
