ios - how to read a huge array of bytes in chunks - pj_strset -

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i working on ios project

i have read huge file in chunks of 4kb here have far:

nsdata *filedata= [self getbytesfrominput]; pj_str_t text; int chunksize = 4*1024; int filesize = [filedata length];  while (filesize>0){  if (filesize<=chunksize) { chunksize = filesize; filesize=0; } else filesize = filesize-chunksize;  pj_strset(&text, (char*)[filedata bytes], min([filedata length], chunksize); //takes first chunk     //but how take next chunk of data?  //do &text .... }

i refactor code loading files in chunks, can access later chunks adding offset byte-pointer:

int currentoffset = 0;  while (filesize>0) {   ...   char* bytepointer = (char*)[filedata bytes];   pj_strset(&text, bytepointer+currentoffset, min([filedata length], chunksize);   currentoffset += chunksize; }

edit:

this should same thing reading file chunk chunk:

nsstring *yourfilepath; nsfilehandle *filehandle = [nsfilehandle filehandleforreadingatpath:yourfilepath]; int chunksize = 4*1024; pj_str_t text; nsdata *data;  while ((data = [filehandle readdataoflength:chunksize]) && [data length] > 0) {   pj_strset(&text, (char*)[data bytes], [data length]); }

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