void DecodeRLE(const uint8_t* data, std::size_t size, Dump& result)
{
Dump tmp;
tmp.reserve(MAX_SECTOR_SIZE);
ByteStream stream(data, size);
while (!stream.Eof())
{
const uint_t len = 2 * stream.GetByte();
Require(!stream.Eof());
const uint_t count = stream.GetByte();
Require(count != 0);
const bool isRLE = len != 0;
const uint_t blockSize = isRLE ? len : count;
Require(stream.GetRestBytes() >= blockSize);
for (uint_t idx = 0; idx != blockSize; ++idx)
{
tmp.push_back(stream.GetByte());
}
if (isRLE)
{
Require(CopyFromBack(len, tmp, len * (count - 1)));
}
}
result.swap(tmp);
}
bool DecodeData()
{
const uint8_t* const rawData = static_cast<const uint8_t*>(Header.ID);
const std::size_t dataOffset = fromLE(Header.DataOffset);
const uint_t cylinders = fromLE(Header.Cylinders);
const uint_t sides = fromLE(Header.Sides);
Dump result;
result.reserve(FDI_MAX_SIZE);
std::size_t trackInfoOffset = sizeof(Header) + fromLE(Header.InfoSize);
std::size_t rawSize = dataOffset;
for (uint_t cyl = 0; cyl != cylinders; ++cyl)
{
for (uint_t sid = 0; sid != sides; ++sid)
{
if (trackInfoOffset + sizeof(RawTrack) > Limit)
{
return false;
}
const RawTrack* const trackInfo = safe_ptr_cast<const RawTrack*>(rawData + trackInfoOffset);
typedef std::vector<SectorDescr> SectorDescrs;
//collect sectors reference
SectorDescrs sectors;
sectors.reserve(trackInfo->SectorsCount);
for (std::size_t secNum = 0; secNum != trackInfo->SectorsCount; ++secNum)
{
const RawTrack::Sector* const sector = trackInfo->Sectors + secNum;
const std::size_t secSize = 128 << sector->Size;
//since there's no information about head number (always 0), do not check it
//assert(sector->Head == sid);
if (sector->Cylinder != cyl)
{
return false;
}
const std::size_t offset = dataOffset + fromLE(sector->Offset) + fromLE(trackInfo->Offset);
if (offset + secSize > Limit)
{
return false;
}
sectors.push_back(SectorDescr(sector->Number, rawData + offset, rawData + offset + secSize));
rawSize = std::max(rawSize, offset + secSize);
}
//sort by number
std::sort(sectors.begin(), sectors.end());
//and gather data
for (SectorDescrs::const_iterator it = sectors.begin(), lim = sectors.end(); it != lim; ++it)
{
result.insert(result.end(), it->Begin, it->End);
}
//calculate next track by offset
trackInfoOffset += sizeof(*trackInfo) + (trackInfo->SectorsCount - 1) * sizeof(trackInfo->Sectors);
}
}
UsedSize = rawSize;
Decoded.swap(result);
return true;
}
void DecodeR2P(const uint8_t* data, std::size_t size, Dump& result)
{
Require(size % sizeof(R2PEntry) == 0);
Dump tmp;
tmp.reserve(MAX_SECTOR_SIZE);
for (const R2PEntry* it = safe_ptr_cast<const R2PEntry*>(data), *lim = it + size / sizeof(*it); it != lim; ++it)
{
const uint_t count = fromLE(it->Count);
Require(count != 0);
tmp.push_back(it->Data[0]);
tmp.push_back(it->Data[1]);
Require(CopyFromBack(sizeof(it->Data), tmp, sizeof(it->Data) * (count - 1)));
}
result.swap(tmp);
}