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/* $Id$ */
#include <stdio.h>
#include <erl_driver.h>
#include <ei.h>
#include <expat.h>
typedef struct {
ErlDrvPort port;
XML_Parser parser;
} expat_data;
void *erlXML_StartElementHandler(expat_data *d,
const XML_Char *name,
const XML_Char **atts)
{
int i;
ei_x_buff buf;
ei_x_new_with_version(&buf);
ei_x_encode_tuple_header(&buf, 2);
ei_x_encode_atom(&buf, "xmlstart");
ei_x_encode_tuple_header(&buf, 2);
ei_x_encode_string(&buf, name);
for (i = 0; atts[i]; i += 2) {}
ei_x_encode_list_header(&buf, i/2);
for (i = 0; atts[i]; i += 2)
{
ei_x_encode_tuple_header(&buf, 2);
ei_x_encode_string(&buf, atts[i]);
ei_x_encode_string(&buf, atts[i+1]);
}
ei_x_encode_empty_list(&buf);
driver_output(d->port, buf.buff, buf.index);
ei_x_free(&buf);
return NULL;
}
void *erlXML_EndElementHandler(expat_data *d,
const XML_Char *name)
{
ei_x_buff buf;
ei_x_new_with_version(&buf);
ei_x_encode_tuple_header(&buf, 2);
ei_x_encode_atom(&buf, "xmlend");
ei_x_encode_string(&buf, name);
driver_output(d->port, buf.buff, buf.index);
ei_x_free(&buf);
return NULL;
}
void *erlXML_CharacterDataHandler(expat_data *d,
const XML_Char *s,
int len)
{
ei_x_buff buf;
ei_x_new_with_version(&buf);
ei_x_encode_tuple_header(&buf, 2);
ei_x_encode_atom(&buf, "xmlcdata");
ei_x_encode_string_len(&buf, s, len);
driver_output(d->port, buf.buff, buf.index);
ei_x_free(&buf);
return NULL;
}
static ErlDrvData expat_erl_start(ErlDrvPort port, char *buff)
{
expat_data* d = (expat_data*)driver_alloc(sizeof(expat_data));
d->port = port;
d->parser = XML_ParserCreate("UTF-8");
XML_SetUserData(d->parser, d);
XML_SetStartElementHandler(
d->parser, (XML_StartElementHandler)erlXML_StartElementHandler);
XML_SetEndElementHandler(
d->parser, (XML_EndElementHandler)erlXML_EndElementHandler);
XML_SetCharacterDataHandler(
d->parser, (XML_CharacterDataHandler)erlXML_CharacterDataHandler);
return (ErlDrvData)d;
}
static void expat_erl_stop(ErlDrvData handle)
{
XML_ParserFree(((expat_data *)handle)->parser);
driver_free((char*)handle);
}
static void expat_erl_output(ErlDrvData handle, char *buff, int bufflen)
{
expat_data* d = (expat_data*)handle;
int res, errcode;
char *errstring;
ei_x_buff buf;
/*buff[bufflen] = 0;
fprintf(stderr, "RCVD: '%s'\n", buff);
fflush(stderr);*/
res = XML_Parse(d->parser, buff, bufflen, 0);
if(!res)
{
errcode = XML_GetErrorCode(d->parser);
errstring = (char *)XML_ErrorString(errcode);
ei_x_new_with_version(&buf);
ei_x_encode_tuple_header(&buf, 2);
ei_x_encode_atom(&buf, "xmlerror");
ei_x_encode_tuple_header(&buf, 2);
ei_x_encode_long(&buf, errcode);
ei_x_encode_string(&buf, errstring);
driver_output(d->port, buf.buff, buf.index);
ei_x_free(&buf);
}
//driver_output(d->port, &res, 1);
}
ErlDrvEntry expat_driver_entry = {
NULL, /* F_PTR init, N/A */
expat_erl_start, /* L_PTR start, called when port is opened */
expat_erl_stop, /* F_PTR stop, called when port is closed */
expat_erl_output, /* F_PTR output, called when erlang has sent */
NULL, /* F_PTR ready_input, called when input descriptor ready */
NULL, /* F_PTR ready_output, called when output descriptor ready */
"expat_erl", /* char *driver_name, the argument to open_port */
NULL, /* F_PTR finish, called when unloaded */
NULL, /* F_PTR control, port_command callback */
NULL, /* F_PTR timeout, reserved */
NULL /* F_PTR outputv, reserved */
};
DRIVER_INIT(expat_erl) /* must match name in driver_entry */
{
return &expat_driver_entry;
}
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