vector< BlockChecksum> getBlockChecksum(vector<Chunk> unmatchedChunks, string filepath){
cout<<"Calculating weak and strong checksums of the blocks...\n";
vector < BlockChecksum> blockChecksums;
int blockSize=ConfigurationManager::getBlockSize();
ifstream in_file(filepath.c_str(),std::ifstream::binary);
int blockcount=0;
for(int i=0; i<unmatchedChunks.size();i++){
in_file.seekg(unmatchedChunks[i].getOffset(),in_file.beg);
int k=0;
char data[blockSize];
for(k=0;k+blockSize<unmatchedChunks[i].getLength();k+=blockSize){
in_file.read(data,blockSize);
unsigned int weaksum=rs_calc_weak_sum(&data,blockSize);
BlockChecksum block(weaksum,unmatchedChunks[i].getOffset()+k,blockSize);
rs_calc_strong_sum(&data,blockSize,&block.strongsum);
blockcount++;
blockChecksums.push_back(block);
}
int kl=unmatchedChunks[i].getLength();
int kb=k-blockSize;
if(kl>kb){
int remainingRBlength=unmatchedChunks[i].getLength()-k;
in_file.read(data,remainingRBlength);
char extradata[remainingRBlength];
unsigned int weaksum=rs_calc_weak_sum(&extradata,blockSize);
BlockChecksum block(weaksum,unmatchedChunks[i].getOffset()+k,remainingRBlength);
rs_calc_strong_sum(&data,blockSize,&block.strongsum);
blockcount++;
blockChecksums.push_back(block);
}
}
in_file.close();
return blockChecksums;
}
/**
* Generate the checksums for a block and write it out. Called when
* we already know we have enough data in memory at \p block.
*/
static rs_result
rs_sig_do_block(rs_job_t *job, const void *block, size_t len)
{
unsigned int weak_sum;
rs_strong_sum_t strong_sum;
weak_sum = rs_calc_weak_sum(block, len);
rs_calc_strong_sum(block, len, &strong_sum);
rs_squirt_n4(job, weak_sum);
rs_tube_write(job, strong_sum, job->strong_sum_len);
if (rs_trace_enabled()) {
char strong_sum_hex[RS_MD4_LENGTH * 2 + 1];
rs_hexify(strong_sum_hex, strong_sum, job->strong_sum_len);
rs_trace("sent weak sum 0x%08x and strong sum %s", weak_sum,
strong_sum_hex);
}
job->stats.sig_blocks++;
return RS_RUNNING;
}
