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#include "erl_nif.h"
#include "sha-2/sha-256.h"
struct buffer_state;
#include "gen_yielding_sha_256.h"
ERL_NIF_TERM
mk_atom(ErlNifEnv* env, const char* atom)
{
ERL_NIF_TERM ret;
if(!enif_make_existing_atom(env, atom, &ret, ERL_NIF_LATIN1))
{
return enif_make_atom(env, atom);
}
return ret;
}
ERL_NIF_TERM
mk_error(ErlNifEnv* env, const char* mesg)
{
return enif_make_tuple2(env, mk_atom(env, "error"), mk_atom(env, mesg));
}
void* allocator(size_t size, void* context){
(void)context;
return enif_alloc(size);
}
void freer(void* data, void* context){
(void)context;
enif_free(data);
}
typedef struct {
void* continuation;
ErlNifEnv* work_env;
ErlNifBinary out_bin;
} sha256continuation;
/* #define DEBUG */
#ifdef DEBUG
# define DEBUG_PRINT(x) printf x
long nr_of_yields = 0;
#else
# define DEBUG_PRINT(x) do {} while (0)
#endif
void sha256continuation_ErlNifResourceDtor(ErlNifEnv* caller_env, void* obj){
sha256continuation* continuation = obj;
if(continuation->continuation != NULL){
calc_sha_256_ycf_gen_destroy(continuation->continuation);
enif_release_binary(&continuation->out_bin);
enif_free_env(continuation->work_env);
continuation->continuation = NULL;
DEBUG_PRINT(("DESTOY\n"));
}
DEBUG_PRINT(("DEALLOC\n"));
}
#define REDUCTIONS_UNTIL_YCF_YIELD() (200*300*8)
static ERL_NIF_TERM
sha256_nif_cont_after_yield(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
ErlNifResourceType* res_type = (ErlNifResourceType*)enif_priv_data(env);
long nr_of_reductions = REDUCTIONS_UNTIL_YCF_YIELD();
sha256continuation* continuation;
enif_get_resource(env,
argv[0],
res_type,
(void**)&continuation);
calc_sha_256_ycf_gen_continue(&nr_of_reductions,
&continuation->continuation,
NULL);
if(YCF_IS_YIELDED(continuation->continuation)){
#ifdef DEBUG
nr_of_yields++;
#endif
return enif_schedule_nif(env, "sha256_nif_cont_after_yield", 0, sha256_nif_cont_after_yield, 1, argv);
}
DEBUG_PRINT(("NUMBER OF YCF_YIELD()S %ld \n", nr_of_yields));
enif_free_env(continuation->work_env);
ErlNifBinary out_bin = continuation->out_bin;
return enif_make_binary(env, &out_bin);
}
static ERL_NIF_TERM
sha256_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
{
/* ErlNifEnv* msg_env; */
ErlNifResourceType* res_type = (ErlNifResourceType*)enif_priv_data(env);
ErlNifEnv *work_env = enif_alloc_env();
void* wb = NULL;
long nr_of_reductions;
ERL_NIF_TERM newargv[1];
if(argc != 1 || !enif_is_binary(env, argv[0]))
{
return enif_make_badarg(env);
}
/* Copy the input binary to the work environemnt so it will be kept when we are yielding */
ERL_NIF_TERM input_bin_term = enif_make_copy(work_env, argv[0]);
ErlNifBinary input_bin;
enif_inspect_binary(work_env, input_bin_term, &input_bin);
ErlNifBinary out_bin;
enif_alloc_binary(256/8, &out_bin);
nr_of_reductions = REDUCTIONS_UNTIL_YCF_YIELD();
#ifdef DEBUG
nr_of_yields = 0;
#endif
calc_sha_256_ycf_gen_yielding(&nr_of_reductions,
&wb,
NULL,
allocator,
freer,
NULL,
64,
NULL,
out_bin.data,
input_bin.data,
input_bin.size);
if(YCF_IS_YIELDED(wb)){
DEBUG_PRINT(("TRAPPED FIRST CALL %ld \n", nr_of_reductions));
sha256continuation* continuation =
enif_alloc_resource(res_type,
sizeof(sha256continuation));
continuation->work_env = work_env;
continuation->continuation = wb;
continuation->out_bin = out_bin;
newargv[0] = enif_make_resource(env, continuation);
enif_release_resource(continuation);
return enif_schedule_nif(env, "sha256_nif_cont_after_yield", 0, sha256_nif_cont_after_yield, 1, newargv);
}
enif_free_env(work_env);
return enif_make_binary(env, &out_bin);
}
static ErlNifFunc nif_funcs[] = {
{"sha256", 1, sha256_nif}
};
static int
nifload(ErlNifEnv* env, void** priv_data, ERL_NIF_TERM load_info)
{
*priv_data = enif_open_resource_type(env,
NULL,
"sha256_nif",
sha256continuation_ErlNifResourceDtor,
ERL_NIF_RT_CREATE|ERL_NIF_RT_TAKEOVER,
NULL);
return 0;
}
static int
nifupgrade(ErlNifEnv* env, void** priv_data, void** old_priv_data, ERL_NIF_TERM load_info)
{
*priv_data = enif_open_resource_type(env,
NULL,
"sha256_nif",
sha256continuation_ErlNifResourceDtor,
ERL_NIF_RT_TAKEOVER,
NULL);
return 0;
}
ERL_NIF_INIT(sha256_nif, nif_funcs, nifload, NULL, nifupgrade, NULL);
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