/**
* @brief write a given file block to disk
* @param io the core io data structure
* @param out the image stream to write to
* @param block the block to write out
*/
inline void writeBlock(SharedCoreIO const &io, ContainerImageStream &out, uint64_t const block)
{
std::vector<uint8_t> ints;
ints.assign(FILE_BLOCK_SIZE - FILE_BLOCK_META, 0);
// write out block metadata
uint64_t offset = getOffsetOfFileBlock(block, io->blocks);
(void)out.seekp(offset);
// write m_bytesWritten; 0 to begin with
uint8_t sizeDat[4];
uint32_t size = 0;
convertInt32ToInt4Array(size, sizeDat);
(void)out.write((char*)sizeDat, 4);
// write m_next; begins as same as index
uint8_t nextDat[8];
convertUInt64ToInt8Array(block, nextDat);
(void)out.write((char*)nextDat, 8);
// write data bytes
(void)out.write((char*)&ints.front(), FILE_BLOCK_SIZE - FILE_BLOCK_META);
assert(!out.bad());
}
/**
* @brief gets the next file block index from the given file block
* @param in the knoxcrypt image stream
* @param n the file block to get the next index from
* @param totalBlocks the total number of blocks in the knoxcrypt
* @return the next file block index
*/
inline uint64_t getIndexOfNextFileBlockFromFileBlockN(knoxcrypt::ContainerImageStream &in,
uint64_t const n,
uint64_t const totalBlocks)
{
auto offset = getOffsetOfFileBlock(n, totalBlocks) + 4;
(void)in.seekg(offset);
uint8_t dat[8];
(void)in.read((char*)dat, 8);
return convertInt8ArrayToInt64(dat);
}
/**
* @brief gets the next file block index from the given file block
* @param in the knoxcrypt image stream
* @param n the file block to get the next index from
* @param totalBlocks the total number of blocks in the knoxcrypt
* @return the next file block index
*/
inline uint32_t getNumberOfDataBytesWrittenToFileBlockN(knoxcrypt::ContainerImageStream &in,
uint64_t const n,
uint64_t const totalBlocks)
{
uint64_t offset = getOffsetOfFileBlock(n, totalBlocks);
(void)in.seekg(offset);
uint8_t dat[4];
(void)in.read((char*)dat, 4);
return convertInt4ArrayToInt32(dat);
}
/**
* @brief gets the next file block index from the given file block
* @param in the teasafe image stream
* @param n the file block to get the next index from
* @param totalBlocks the total number of blocks in the teasafe
* @return the next file block index
*/
inline uint64_t getIndexOfNextFileBlockFromFileBlockN(teasafe::TeaSafeImageStream &in,
uint64_t const n,
uint64_t const totalBlocks)
{
uint64_t offset = getOffsetOfFileBlock(n, totalBlocks) + 4;
(void)in.seekg(offset);
uint8_t dat[8];
(void)in.read((char*)dat, 8);
return convertInt8ArrayToInt64(dat);
}
