Hi,
Here is my additional observation.
>
> Reproduce the problem on liblzma
> ----------------------------------------
when setting filter as only LZMA1, it returns expected SIZE of output.
Because BCJ should not change size, BCJ may have a bug, or LZMA1 - BCJ pipeline
may be a problem.
test_lzma_bcj_exact_size.c
```
/* please placed in xz/tests/ */
#include "tests.h"
static uint8_t buf[12800];
static uint8_t obuf[12800];
static void
decompress(size_t in_size)
{
lzma_ret lzret;
const size_t out_size = 12800;
lzma_stream strm = LZMA_STREAM_INIT;
strm.next_in = buf;
strm.avail_in = in_size;
strm.next_out = obuf;
strm.avail_out = out_size;
lzma_options_lzma opt_lzma;
succeed(lzma_lzma_preset(&opt_lzma, 0));
lzma_filter filters[3] = {
// { .id = LZMA_FILTER_X86, .options = NULL },
{ .id = LZMA_FILTER_LZMA1, .options = &opt_lzma },
{ .id = LZMA_VLI_UNKNOWN, .options = NULL },
};
succeed(lzma_raw_decoder(&strm, filters));
lzret = lzma_code(&strm, LZMA_RUN);
expect(lzret == LZMA_OK);
expect(strm.total_in == in_size);
expect(strm.total_out == out_size); // LZMA1+BCJ returns 12796 bytes, LZMA1
returns 12800 bytes
}
extern int
main(void)
{
FILE * filp = fopen("lzmabcj.bin", "rb");
int in_size = fread(buf, sizeof(uint8_t), 11327, filp); // payload ==
11327 bytes
decompress(in_size);
return 0;
}
```
> Download links
> ------------------
>
> you can download a test data from
> https://github.com/miurahr/py7zr/files/4872155/lzmabcj.bin.gz
Hiroshi
