LZMA_HEADER_SIZE
if (*dstlen < LZMA_HEADER_SIZE)
outsizeprocessed = outsize2 - LZMA_HEADER_SIZE;
res = LzmaEncode(dstp + LZMA_HEADER_SIZE, &outsizeprocessed,
*dstlen = outsizeprocessed + LZMA_HEADER_SIZE;
insizepure = srclen - LZMA_HEADER_SIZE;
actual_src = (void *)((Byte *)src + LZMA_HEADER_SIZE);