0
main()
{
char source[1560]="mrinalsaikiaismynamenwhatnotiamgreatajajlksjkkslskldklkdklkdlwhgygehehhejhjejdjjjjjljlkkjjjjjjaasasaaasjsjssjskjkjalsjalksjajslkjckljdjfjfjfjffjkllkjldkjlskjlkjkljklklkalksklksjkjskjksjlksjjskjklsjsjskjkjkjjjsjkjjjjjbhbjbbjbjbssjbsjsbsjssjssjhjdjdjjkkmrinalsaikiaismynamenwhatnotiamgreatajajlksjkkslskldklkdklkdlwhgygehehhejhjejdjjjjjljlkkjjjjjjaasasaaasjsjssjskjkjalsjalksjajslkjckljdjfjfjfjffjkllkjldkjlskjlkjkljklklkalksklksjkjskjksjlksjjskjklsjsjskjkjkjjjsjkjjjjjbhbjbbjbjbssjbsjsbsjssjssjhjdjdjjkk";
int ret ;

bz_stream comp_stream;
comp_stream.next_in = source;
comp_stream.avail_in =strlen(source);

comp_stream.avail_out = 502 ;
char arr[comp_stream.avail_out];
comp_stream.next_out =arr;
comp_stream.opaque = NULL;
comp_stream.bzfree = NULL;
comp_stream.bzalloc = NULL;
comp_stream.state = NULL;

BZ2_bzCompressInit(&comp_stream,1,0,0);


printf("length before compression = %d \n",strlen(source));
printf(" string  original is %s \n",(comp_stream.next_in));


if(BZ2_bzCompress(&comp_stream, BZ_FINISH) == BZ_STREAM_END)
{
    printf("copressed Data\n");
    printf("compressed size length = %d \n",(502 - comp_stream.avail_out));
}
printf("compressed string = %s \n",comp_stream.next_out);
Decompress(comp_stream.next_out,(502 - comp_stream.avail_out));
BZ2_bzCompressEnd(&comp_stream);
ForceBru
  • 43,482
  • 10
  • 63
  • 98
salman khan
  • 33
  • 6
  • 1
    What's the question? Do you get an output different from what you expected? If so, please state your expected output and the one you actually get – bznein Oct 19 '15 at 14:26
  • ya i am geting output but i don't know it's right or wrong but when i am decompress that string that will give me BZ_DATA_ERROR_MAGIC error. – salman khan Oct 19 '15 at 14:28
  • You have been a member here on SO long enough to have read [the help pages](http://stackoverflow.com/help), especially the sections named ["What topics can I ask about here?"](http://stackoverflow.com/help/on-topic) and ["What types of questions should I avoid asking?"](http://stackoverflow.com/help/dont-ask). You should also have had time to [read about how to ask good questions](http://stackoverflow.com/help/how-to-ask). – Some programmer dude Oct 19 '15 at 14:32
  • sorry deimus i written this code in hurry can you explain me how to do compress using bzip2 low level api.... – salman khan Oct 19 '15 at 14:33

1 Answers1

0

The value of next_out will change if any data was written, just like next_in will change if any data was read. In other words, you're trying to decompress the data from immediately after your compressed data ends.

nemequ
  • 16,623
  • 1
  • 43
  • 62
  • (thanks for reply) ...yes but what is the problem in that... i want to check it properly compressed or not .. – salman khan Oct 20 '15 at 04:30
  • Decompression requires a pointer to the *beginning* of the decompressed data, not a pointer to the byte *after* the decompressed data ends. – nemequ Oct 20 '15 at 16:27
  • comp_stream.next_out is point to decompress string which is point to beginning of decompressed data.... – salman khan Oct 23 '15 at 04:38