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xmpp.chapril.org-ejabberd
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xmpp.chapril.org-ejabberd/src/expat_erl.c

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/* $Id$ */
#include <stdio.h>
#include <string.h>
#include <erl_driver.h>
#include <ei.h>
#include <expat.h>
#define EI_ENCODE_STRING_BUG
#ifdef EI_ENCODE_STRING_BUG
/*
* Workaround for EI encode_string bug
*/
#define put8(s,n) do { \
(s)[0] = (char)((n) & 0xff); \
(s) += 1; \
} while (0)
#define put16be(s,n) do { \
(s)[0] = ((n) >> 8) & 0xff; \
(s)[1] = (n) & 0xff; \
(s) += 2; \
} while (0)
#define put32be(s,n) do { \
(s)[0] = ((n) >> 24) & 0xff; \
(s)[1] = ((n) >> 16) & 0xff; \
(s)[2] = ((n) >> 8) & 0xff; \
(s)[3] = (n) & 0xff; \
(s) += 4; \
} while (0)
int ei_encode_string_len_fixed(char *buf, int *index, const char *p, int len)
{
char *s = buf + *index;
char *s0 = s;
int i;
if (len <= 0xffff) {
if (!buf) s += 3;
else {
put8(s,ERL_STRING_EXT);
put16be(s,len);
memmove(s,p,len); /* unterminated string */
}
s += len;
}
else {
if (!buf) s += 6 + (2*len);
else {
/* strings longer than 65535 are encoded as lists */
put8(s,ERL_LIST_EXT);
put32be(s,len);
for (i=0; i<len; i++) {
put8(s,ERL_SMALL_INTEGER_EXT);
put8(s,p[i]);
}
put8(s,ERL_NIL_EXT);
}
}
*index += s-s0;
return 0;
}
int ei_encode_string_fixed(char *buf, int *index, const char *p)
{
return ei_encode_string_len_fixed(buf, index, p, strlen(p));
}
int ei_x_encode_string_len_fixed(ei_x_buff* x, const char* s, int len)
{
int i = x->index;
ei_encode_string_len_fixed(NULL, &i, s, len);
if (!x_fix_buff(x, i))
return -1;
return ei_encode_string_len_fixed(x->buff, &x->index, s, len);
}
int ei_x_encode_string_fixed(ei_x_buff* x, const char* s)
{
return ei_x_encode_string_len_fixed(x, s, strlen(s));
}
#else
#define ei_encode_string_len_fixed(buf, index, p, len) \
ei_encode_string_len(buf, index, p, len)
#define ei_encode_string_fixed(buf, index, p) \
ei_encode_string(buf, index, p)
#define ei_x_encode_string_len_fixed(x, s, len) \
ei_x_encode_string_len(x, s, len)
#define ei_x_encode_string_fixed(x, s) \
ei_x_encode_string(x, s)
#endif
#define XML_START 0
#define XML_END 1
#define XML_CDATA 2
#define XML_ERROR 3
#define PARSE_COMMAND 0
#define PARSE_FINAL_COMMAND 1
ei_x_buff event_buf;
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_encode_list_header(&event_buf, 1);
ei_x_encode_tuple_header(&event_buf, 2);
ei_x_encode_long(&event_buf, XML_START);
ei_x_encode_tuple_header(&event_buf, 2);
ei_x_encode_string_fixed(&event_buf, name);
for (i = 0; atts[i]; i += 2) {}
if (i > 0)
{
ei_x_encode_list_header(&event_buf, i/2);
for (i = 0; atts[i]; i += 2)
{
ei_x_encode_tuple_header(&event_buf, 2);
ei_x_encode_string_fixed(&event_buf, atts[i]);
ei_x_encode_string_fixed(&event_buf, atts[i+1]);
}
}
ei_x_encode_empty_list(&event_buf);
return NULL;
}
void *erlXML_EndElementHandler(expat_data *d,
const XML_Char *name)
{
ei_x_encode_list_header(&event_buf, 1);
ei_x_encode_tuple_header(&event_buf, 2);
ei_x_encode_long(&event_buf, XML_END);
ei_x_encode_string_fixed(&event_buf, name);
return NULL;
}
void *erlXML_CharacterDataHandler(expat_data *d,
const XML_Char *s,
int len)
{
ei_x_encode_list_header(&event_buf, 1);
ei_x_encode_tuple_header(&event_buf, 2);
ei_x_encode_long(&event_buf, XML_CDATA);
ei_x_encode_binary(&event_buf, s, len);
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);
set_port_control_flags(port, PORT_CONTROL_FLAG_BINARY);
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 int expat_erl_control(ErlDrvData drv_data,
unsigned int command,
char *buf, int len,
char **rbuf, int rlen)
{
expat_data* d = (expat_data*)drv_data;
int res, errcode;
char *errstring;
ErlDrvBinary *b;
size_t size;
switch (command)
{
case PARSE_COMMAND:
case PARSE_FINAL_COMMAND:
ei_x_new_with_version(&event_buf);
res = XML_Parse(d->parser, buf, len, command == PARSE_FINAL_COMMAND);
if(!res)
{
errcode = XML_GetErrorCode(d->parser);
errstring = (char *)XML_ErrorString(errcode);
ei_x_encode_list_header(&event_buf, 1);
ei_x_encode_tuple_header(&event_buf, 2);
ei_x_encode_long(&event_buf, XML_ERROR);
ei_x_encode_tuple_header(&event_buf, 2);
ei_x_encode_long(&event_buf, errcode);
ei_x_encode_string_fixed(&event_buf, errstring);
}
ei_x_encode_empty_list(&event_buf);
size = event_buf.index;
b = driver_alloc_binary(size);
memcpy(b->orig_bytes, event_buf.buff, size);
ei_x_free(&event_buf);
*rbuf = (char *)b;
return size;
default:
return 0;
}
}
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 */
NULL, /* 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, /* handle */
expat_erl_control, /* 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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