UInt32 MY_FAST_CALL CrcUpdate(UInt32 v, const void *data, size_t size)
{
const Byte *p = (const Byte *)data;
for (; size > 0 ; size--, p++)
v = CRC_UPDATE_BYTE(v, *p);
return v;
}
static UInt32 CrcUpdateUInt32(UInt32 crc, UInt32 v)
{
crc = CRC_UPDATE_BYTE(crc, (Byte)(v & 0xFF));
crc = CRC_UPDATE_BYTE(crc, (Byte)((v >> 8) & 0xFF));
crc = CRC_UPDATE_BYTE(crc, (Byte)((v >> 16) & 0xFF));
crc = CRC_UPDATE_BYTE(crc, (Byte)((v >> 24) & 0xFF));
return crc;
}
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;
}
void COutArchive::WriteByte(Byte b)
{
if (_countMode)
_countSize++;
else if (_writeToStream)
{
_outByte.WriteByte(b);
_crc = CRC_UPDATE_BYTE(_crc, b);
}
else
_outByte2.WriteByte(b);
}