int compress_blob_xz(const void *src, uint64_t src_size, void *dst, size_t *dst_size) {
#ifdef HAVE_XZ
static const lzma_options_lzma opt = {
1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT,
LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4
};
static const lzma_filter filters[] = {
{ LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt },
{ LZMA_VLI_UNKNOWN, NULL }
};
lzma_ret ret;
size_t out_pos = 0;
assert(src);
assert(src_size > 0);
assert(dst);
assert(dst_size);
/* Returns < 0 if we couldn't compress the data or the
* compressed result is longer than the original */
if (src_size < 80)
return -ENOBUFS;
ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL,
src, src_size, dst, &out_pos, src_size - 1);
if (ret != LZMA_OK)
return -ENOBUFS;
*dst_size = out_pos;
return 0;
#else
return -EPROTONOSUPPORT;
#endif
}
lzma_easy_buffer_encode(uint32_t preset, lzma_check check,
const lzma_allocator *allocator, const uint8_t *in,
size_t in_size, uint8_t *out, size_t *out_pos, size_t out_size)
{
lzma_options_easy opt_easy;
if (lzma_easy_preset(&opt_easy, preset))
return LZMA_OPTIONS_ERROR;
return lzma_stream_buffer_encode(opt_easy.filters, check,
allocator, in, in_size, out, out_pos, out_size);
}
