absorb_data.hpp

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/*
This code is written by kerukuro and released into public domain.
*/
 
#ifndef DIGESTPP_DETAIL_ABSORB_DATA_HPP
#define DIGESTPP_DETAIL_ABSORB_DATA_HPP
 
namespace digestpp
{
 
namespace detail
{
 
// Accumulate data and call the transformation function for full blocks.
template<typename T, typename TF>
inline void absorb_bytes(const unsigned char* data, size_t len, size_t bs, size_t bschk,
        unsigned char* m, size_t& pos, T& total, TF transform)
{
    if (pos && pos + len >= bschk)
    {
        memcpy(m + pos, data, bs - pos);
        transform(m, 1);
        len -= bs - pos;
        data += bs - pos;
        total += bs * 8;
        pos = 0;
    }
    if (len >= bschk)
    {
        size_t blocks = (len + bs - bschk) / bs;
        size_t bytes = blocks * bs;
        transform(data, blocks);
        len -= bytes;
        data += bytes;
        total += (bytes)* 8;
    }
    memcpy(m + pos, data, len);
    pos += len;
}
 
 
} // namespace detail
 
} // namespace digestpp
 
#endif // DIGESTPP_DETAIL_ABSORB_DATA_HPP