mirror of
https://github.com/processone/ejabberd.git
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122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/* $Id$ */
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#include <stdio.h>
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#include <string.h>
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#include <erl_driver.h>
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#include <ei.h>
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#include <iconv.h>
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typedef struct {
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ErlDrvPort port;
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iconv_t cd;
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} iconv_data;
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static ErlDrvData iconv_erl_start(ErlDrvPort port, char *buff)
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{
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iconv_data* d = (iconv_data*)driver_alloc(sizeof(iconv_data));
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d->port = port;
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d->cd = NULL;
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set_port_control_flags(port, PORT_CONTROL_FLAG_BINARY);
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return (ErlDrvData)d;
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}
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static void iconv_erl_stop(ErlDrvData handle)
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{
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driver_free((char*)handle);
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}
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static int iconv_erl_control(ErlDrvData drv_data,
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unsigned int command,
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char *buf, int len,
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char **rbuf, int rlen)
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{
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int i;
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int size;
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int index = 0;
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int avail;
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size_t inleft, outleft;
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ErlDrvBinary *b;
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char *from, *to, *string, *stmp, *rstring, *rtmp;
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iconv_t cd;
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ei_decode_version(buf, &index, &i);
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ei_decode_tuple_header(buf, &index, &i);
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ei_get_type(buf, &index, &i, &size);
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from = malloc(size + 1);
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ei_decode_string(buf, &index, from);
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ei_get_type(buf, &index, &i, &size);
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to = malloc(size + 1);
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ei_decode_string(buf, &index, to);
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ei_get_type(buf, &index, &i, &size);
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stmp = string = malloc(size + 1);
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ei_decode_string(buf, &index, string);
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cd = iconv_open(to, from);
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if (cd == (iconv_t) -1) {
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cd = iconv_open("ascii", "ascii");
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if (cd == (iconv_t) -1) {
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*rbuf = (char*)(b = driver_alloc_binary(size));
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memcpy(b->orig_bytes, string, size);
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free(from);
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free(to);
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free(string);
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return size;
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}
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}
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outleft = avail = 4*size;
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inleft = size;
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rtmp = rstring = malloc(avail);
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while (inleft > 0) {
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if (iconv(cd, &stmp, &inleft, &rtmp, &outleft) == (size_t) -1) {
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stmp++;
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inleft--;
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}
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}
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size = rtmp - rstring;
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*rbuf = (char*)(b = driver_alloc_binary(size));
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memcpy(b->orig_bytes, rstring, size);
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free(from);
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free(to);
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free(string);
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free(rstring);
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iconv_close(cd);
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return size;
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}
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ErlDrvEntry iconv_driver_entry = {
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NULL, /* F_PTR init, N/A */
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iconv_erl_start, /* L_PTR start, called when port is opened */
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iconv_erl_stop, /* F_PTR stop, called when port is closed */
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NULL, /* F_PTR output, called when erlang has sent */
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NULL, /* F_PTR ready_input, called when input descriptor ready */
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NULL, /* F_PTR ready_output, called when output descriptor ready */
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"iconv_erl", /* char *driver_name, the argument to open_port */
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NULL, /* F_PTR finish, called when unloaded */
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NULL, /* handle */
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iconv_erl_control, /* F_PTR control, port_command callback */
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NULL, /* F_PTR timeout, reserved */
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NULL /* F_PTR outputv, reserved */
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};
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DRIVER_INIT(iconv_erl) /* must match name in driver_entry */
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{
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return &iconv_driver_entry;
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}
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