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/* $Id$ */
#include <stdio.h>
#include <string.h>
#include <erl_driver.h>
#include <zlib.h>
#define BUF_SIZE 1024
typedef struct {
ErlDrvPort port;
z_stream *d_stream;
z_stream *i_stream;
} ejabberd_zlib_data;
static ErlDrvData ejabberd_zlib_drv_start(ErlDrvPort port, char *buff)
{
ejabberd_zlib_data *d =
(ejabberd_zlib_data *)driver_alloc(sizeof(ejabberd_zlib_data));
d->port = port;
d->d_stream = (z_stream *)malloc(sizeof(z_stream));
d->d_stream->zalloc = (alloc_func)0;
d->d_stream->zfree = (free_func)0;
d->d_stream->opaque = (voidpf)0;
deflateInit(d->d_stream, Z_DEFAULT_COMPRESSION);
d->i_stream = (z_stream *)malloc(sizeof(z_stream));
d->i_stream->zalloc = (alloc_func)0;
d->i_stream->zfree = (free_func)0;
d->i_stream->opaque = (voidpf)0;
inflateInit(d->i_stream);
set_port_control_flags(port, PORT_CONTROL_FLAG_BINARY);
return (ErlDrvData)d;
}
static void ejabberd_zlib_drv_stop(ErlDrvData handle)
{
ejabberd_zlib_data *d = (ejabberd_zlib_data *)handle;
deflateEnd(d->d_stream);
free(d->d_stream);
inflateEnd(d->i_stream);
free(d->i_stream);
driver_free((char *)handle);
}
#define DEFLATE 1
#define INFLATE 2
#define die_unless(cond, errstr) \
if (!(cond)) \
{ \
rlen = strlen(errstr) + 1; \
b = driver_realloc_binary(b, rlen); \
b->orig_bytes[0] = 1; \
strncpy(b->orig_bytes + 1, errstr, rlen - 1); \
*rbuf = (char *)b; \
return rlen; \
}
static int ejabberd_zlib_drv_control(ErlDrvData handle,
unsigned int command,
char *buf, int len,
char **rbuf, int rlen)
{
ejabberd_zlib_data *d = (ejabberd_zlib_data *)handle;
int err;
int size;
ErlDrvBinary *b;
switch (command)
{
case DEFLATE:
size = BUF_SIZE + 1;
rlen = 1;
b = driver_alloc_binary(size);
b->orig_bytes[0] = 0;
d->d_stream->next_in = buf;
d->d_stream->avail_in = len;
d->d_stream->avail_out = 0;
err = Z_OK;
while (err == Z_OK && d->d_stream->avail_out == 0)
{
d->d_stream->next_out = b->orig_bytes + rlen;
d->d_stream->avail_out = BUF_SIZE;
err = deflate(d->d_stream, Z_SYNC_FLUSH);
die_unless((err == Z_OK) || (err == Z_STREAM_END),
"Deflate error");
rlen += (BUF_SIZE - d->d_stream->avail_out);
size += (BUF_SIZE - d->d_stream->avail_out);
b = driver_realloc_binary(b, size);
}
b = driver_realloc_binary(b, rlen);
*rbuf = (char *)b;
return rlen;
case INFLATE:
size = BUF_SIZE + 1;
rlen = 1;
b = driver_alloc_binary(size);
b->orig_bytes[0] = 0;
if (len > 0) {
d->i_stream->next_in = buf;
d->i_stream->avail_in = len;
d->i_stream->avail_out = 0;
err = Z_OK;
while (err == Z_OK && d->i_stream->avail_out == 0)
{
d->i_stream->next_out = b->orig_bytes + rlen;
d->i_stream->avail_out = BUF_SIZE;
err = inflate(d->i_stream, Z_SYNC_FLUSH);
die_unless((err == Z_OK) || (err == Z_STREAM_END),
"Inflate error");
rlen += (BUF_SIZE - d->i_stream->avail_out);
size += (BUF_SIZE - d->i_stream->avail_out);
b = driver_realloc_binary(b, size);
}
}
b = driver_realloc_binary(b, rlen);
*rbuf = (char *)b;
return rlen;
}
b = driver_alloc_binary(1);
b->orig_bytes[0] = 0;
*rbuf = (char *)b;
return 1;
}
ErlDrvEntry ejabberd_zlib_driver_entry = {
NULL, /* F_PTR init, N/A */
ejabberd_zlib_drv_start, /* L_PTR start, called when port is opened */
ejabberd_zlib_drv_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 */
"ejabberd_zlib_drv", /* char *driver_name, the argument to open_port */
NULL, /* F_PTR finish, called when unloaded */
NULL, /* handle */
ejabberd_zlib_drv_control, /* F_PTR control, port_command callback */
NULL, /* F_PTR timeout, reserved */
NULL /* F_PTR outputv, reserved */
};
DRIVER_INIT(ejabberd_zlib_drv) /* must match name in driver_entry */
{
return &ejabberd_zlib_driver_entry;
}
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