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#include <erl_nif.h>
#include <string.h>
#include <stdio.h>
static ERL_NIF_TERM atom_xmlelement;
static ERL_NIF_TERM atom_xmlcdata;
struct buf {
int limit;
int len;
unsigned char *b;
};
static int make_element(ErlNifEnv* env, struct buf *rbuf, ERL_NIF_TERM el);
static int load(ErlNifEnv* env, void** priv, ERL_NIF_TERM load_info)
{
atom_xmlelement = enif_make_atom(env, "xmlel");
atom_xmlcdata = enif_make_atom(env, "xmlcdata");
return 0;
}
static struct buf *init_buf(ErlNifEnv* env)
{
struct buf *rbuf = enif_alloc(sizeof(struct buf));
rbuf->limit = 1024;
rbuf->len = 0;
rbuf->b = enif_alloc(rbuf->limit);
return rbuf;
}
static void destroy_buf(ErlNifEnv* env, struct buf *rbuf)
{
if (rbuf) {
if (rbuf->b) {
enif_free(rbuf->b);
};
enif_free(rbuf);
};
}
inline void resize_buf(ErlNifEnv* env, struct buf *rbuf, int len_to_add)
{
int new_len = rbuf->len + len_to_add;
if (new_len > rbuf->limit) {
while (new_len > rbuf->limit)
rbuf->limit *= 2;
rbuf->b = enif_realloc(rbuf->b, rbuf->limit);
}
}
static void buf_add_char(ErlNifEnv* env, struct buf *rbuf, unsigned char c)
{
resize_buf(env, rbuf, 1);
(rbuf->b)[rbuf->len] = c;
rbuf->len += 1;
}
static void buf_add_str(ErlNifEnv* env, struct buf *rbuf, char *data, int len)
{
resize_buf(env, rbuf, len);
memcpy(rbuf->b + rbuf->len, data, len);
rbuf->len += len;
}
inline void crypt(ErlNifEnv* env, struct buf *rbuf, unsigned char *data, int len)
{
int i;
for (i = 0; i < len; i++) {
switch (data[i]) {
case '&':
buf_add_str(env, rbuf, "&", 5);
break;
case '<':
buf_add_str(env, rbuf, "<", 4);
break;
case '>':
buf_add_str(env, rbuf, ">", 4);
break;
case '"':
buf_add_str(env, rbuf, """, 6);
break;
case '\'':
buf_add_str(env, rbuf, "'", 6);
break;
default:
buf_add_char(env, rbuf, data[i]);
break;
};
};
}
static int make_elements(ErlNifEnv* env, struct buf *rbuf, ERL_NIF_TERM els)
{
ERL_NIF_TERM head, tail;
int ret = 0;
while (enif_get_list_cell(env, els, &head, &tail)) {
ret = make_element(env, rbuf, head);
if (ret) {
els = tail;
} else {
break;
};
};
return ret;
}
static int make_attrs(ErlNifEnv* env, struct buf *rbuf, ERL_NIF_TERM attrs)
{
ErlNifBinary name, data;
ERL_NIF_TERM head, tail;
const ERL_NIF_TERM *tuple;
int arity, ret = 1;
while (enif_get_list_cell(env, attrs, &head, &tail)) {
if (enif_get_tuple(env, head, &arity, &tuple)) {
if (arity == 2) {
if (enif_inspect_iolist_as_binary(env, tuple[0], &name) &&
enif_inspect_iolist_as_binary(env, tuple[1], &data)) {
buf_add_char(env, rbuf, ' ');
buf_add_str(env, rbuf, (char *)name.data, name.size);
buf_add_str(env, rbuf, "='", 2);
crypt(env, rbuf, data.data, data.size);
buf_add_char(env, rbuf, '\'');
attrs = tail;
} else {
ret = 0;
break;
};
} else {
ret = 0;
break;
};
} else {
ret = 0;
break;
};
};
return ret;
}
static int make_element(ErlNifEnv* env, struct buf *rbuf, ERL_NIF_TERM el)
{
ErlNifBinary cdata, name;
const ERL_NIF_TERM *tuple;
int arity, ret = 0;
if (enif_get_tuple(env, el, &arity, &tuple)) {
if (arity == 2) {
if (!enif_compare(tuple[0], atom_xmlcdata)) {
if (enif_inspect_iolist_as_binary(env, tuple[1], &cdata)) {
crypt(env, rbuf, cdata.data, cdata.size);
ret = 1;
};
};
};
if (arity == 4) {
if (!enif_compare(tuple[0], atom_xmlelement)) {
if (enif_inspect_iolist_as_binary(env, tuple[1], &name)) {
buf_add_char(env, rbuf, '<');
buf_add_str(env, rbuf, (char *)name.data, name.size);
ret = make_attrs(env, rbuf, tuple[2]);
if (ret) {
if (enif_is_empty_list(env, tuple[3])) {
buf_add_str(env, rbuf, "/>", 2);
} else {
buf_add_char(env, rbuf, '>');
ret = make_elements(env, rbuf, tuple[3]);
if (ret) {
buf_add_str(env, rbuf, "</", 2);
buf_add_str(env, rbuf, (char*)name.data, name.size);
buf_add_char(env, rbuf, '>');
};
};
};
};
};
};
};
return ret;
}
static ERL_NIF_TERM element_to(ErlNifEnv* env, int argc,
const ERL_NIF_TERM argv[],
int as_string)
{
ErlNifBinary output;
ERL_NIF_TERM result;
struct buf *rbuf;
if (argc == 1) {
rbuf = init_buf(env);
if (make_element(env, rbuf, argv[0])) {
if (as_string) {
(rbuf->b)[rbuf->len] = 0;
result = enif_make_string(env, (char *) rbuf->b, ERL_NIF_LATIN1);
destroy_buf(env, rbuf);
return result;
} else {
if (enif_alloc_binary(rbuf->len, &output)) {
memcpy(output.data, rbuf->b, rbuf->len);
result = enif_make_binary(env, &output);
destroy_buf(env, rbuf);
return result;
};
};
};
destroy_buf(env, rbuf);
};
return enif_make_badarg(env);
}
#ifdef SSL40
static ERL_NIF_TERM element_to_string(ErlNifEnv* env, int argc,
const ERL_NIF_TERM argv[])
{
return element_to(env, argc, argv, 1);
}
#endif
static ERL_NIF_TERM element_to_binary(ErlNifEnv* env, int argc,
const ERL_NIF_TERM argv[])
{
return element_to(env, argc, argv, 0);
}
static ErlNifFunc nif_funcs[] =
{
/* Stupid Erlang bug with enif_make_string() is fixed
in R14A only (OTP-8685), so we can't use
element_to_string in Erlang < R14A.*/
#ifdef SSL40
{"element_to_string", 1, element_to_string},
#endif
{"element_to_binary", 1, element_to_binary}
};
ERL_NIF_INIT(xml, nif_funcs, load, NULL, NULL, NULL)
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