186     long begin, end;  in rk29_fread()  local
202     begin = ftell(stream);  in rk29_fread()
203     if (begin < 0)  in rk29_fread()
204         begin = 0;  in rk29_fread()
210     end = begin + total;  in rk29_fread()
211     offset = begin & ~READ_MASK;  in rk29_fread()
213     if (begin & READ_MASK) {  in rk29_fread()
217         count = min(end, offset + READ_SIZE) - begin;  in rk29_fread()
218         memcpy(p, buf + (begin & READ_MASK), count);  in rk29_fread()
242     fseek(stream, begin + count * size, SEEK_SET);  in rk29_fread()
250     long begin, end;  in rk29_fwrite()  local
266     begin = ftell(stream);  in rk29_fwrite()
267     if (begin < 0)  in rk29_fwrite()
268         begin = 0;  in rk29_fwrite()
274     end = begin + total;  in rk29_fwrite()
275     offset = begin & ~WRITE_MASK;  in rk29_fwrite()
277     if (begin & WRITE_MASK) {  in rk29_fwrite()
281         count = min(end, offset + WRITE_SIZE) - begin;  in rk29_fwrite()
282         memcpy(buf + (begin & WRITE_MASK), p, count);  in rk29_fwrite()
311     fseek(stream, begin + count * size, SEEK_SET);  in rk29_fwrite()