void CInArchive::SkipArchiveComment()
{
if (!m_SeekOnArchiveComment)
return;
AddToSeekValue(m_ArchiveHeader.Size - m_ArchiveHeader.GetBaseSize());
m_SeekOnArchiveComment = false;
}
HRESULT CInArchive::Open2(IInStream *stream, const UInt64 *searchHeaderSizeLimit)
{
m_CryptoMode = false;
RINOK(stream->Seek(0, STREAM_SEEK_SET, &m_StreamStartPosition));
m_Position = m_StreamStartPosition;
UInt64 arcStartPos;
RINOK(FindSignatureInStream(stream, NHeader::kMarker, NHeader::kMarkerSize,
searchHeaderSizeLimit, arcStartPos));
m_Position = arcStartPos + NHeader::kMarkerSize;
RINOK(stream->Seek(m_Position, STREAM_SEEK_SET, NULL));
Byte buf[NHeader::NArchive::kArchiveHeaderSize + 1];
RINOK(ReadStream_FALSE(stream, buf, NHeader::NArchive::kArchiveHeaderSize));
AddToSeekValue(NHeader::NArchive::kArchiveHeaderSize);
UInt32 blockSize = Get16(buf + 5);
_header.EncryptVersion = 0;
_header.Flags = Get16(buf + 3);
UInt32 headerSize = NHeader::NArchive::kArchiveHeaderSize;
if (_header.IsThereEncryptVer())
{
if (blockSize <= headerSize)
return S_FALSE;
RINOK(ReadStream_FALSE(stream, buf + NHeader::NArchive::kArchiveHeaderSize, 1));
AddToSeekValue(1);
_header.EncryptVersion = buf[NHeader::NArchive::kArchiveHeaderSize];
headerSize += 1;
}
if (blockSize < headerSize ||
buf[2] != NHeader::NBlockType::kArchiveHeader ||
(UInt32)Get16(buf) != (CrcCalc(buf + 2, headerSize - 2) & 0xFFFF))
return S_FALSE;
size_t commentSize = blockSize - headerSize;
_comment.SetCapacity(commentSize);
RINOK(ReadStream_FALSE(stream, _comment, commentSize));
AddToSeekValue(commentSize);
m_Stream = stream;
_header.StartPosition = arcStartPos;
return S_OK;
}
HRESULT CInArchive::ReadBytes(void *data, UInt32 size, UInt32 *processedSize)
{
UInt32 realProcessedSize;
HRESULT result = ReadStream(m_Stream, data, size, &realProcessedSize);
if(processedSize != NULL)
*processedSize = realProcessedSize;
AddToSeekValue(realProcessedSize);
return result;
}
