static void zlib_exit(struct crypto_tfm *tfm)
{
struct zlib_ctx *ctx = crypto_tfm_ctx(tfm);
zlib_comp_exit(ctx);
zlib_decomp_exit(ctx);
}
static int zlib_compress_setup(struct crypto_pcomp *tfm, void *params,
unsigned int len)
{
struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm));
struct z_stream_s *stream = &ctx->comp_stream;
struct nlattr *tb[ZLIB_COMP_MAX + 1];
int window_bits, mem_level;
size_t workspacesize;
int ret;
ret = nla_parse(tb, ZLIB_COMP_MAX, params, len, NULL);
if (ret)
return ret;
zlib_comp_exit(ctx);
window_bits = tb[ZLIB_COMP_WINDOWBITS]
? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS])
: MAX_WBITS;
mem_level = tb[ZLIB_COMP_MEMLEVEL]
? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL])
: DEF_MEM_LEVEL;
workspacesize = zlib_deflate_workspacesize(window_bits, mem_level);
stream->workspace = vmalloc(workspacesize);
if (!stream->workspace)
return -ENOMEM;
memset(stream->workspace, 0, workspacesize);
ret = zlib_deflateInit2(stream,
tb[ZLIB_COMP_LEVEL]
? nla_get_u32(tb[ZLIB_COMP_LEVEL])
: Z_DEFAULT_COMPRESSION,
tb[ZLIB_COMP_METHOD]
? nla_get_u32(tb[ZLIB_COMP_METHOD])
: Z_DEFLATED,
tb[ZLIB_COMP_WINDOWBITS]
? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS])
: MAX_WBITS,
tb[ZLIB_COMP_MEMLEVEL]
? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL])
: DEF_MEM_LEVEL,
tb[ZLIB_COMP_STRATEGY]
? nla_get_u32(tb[ZLIB_COMP_STRATEGY])
: Z_DEFAULT_STRATEGY);
if (ret != Z_OK) {
vfree(stream->workspace);
stream->workspace = NULL;
return -EINVAL;
}
return 0;
}