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/*
* Purple's oscar protocol plugin
* This file is the legal property of its developers.
* Please see the AUTHORS file distributed alongside this file.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*/
/*
* This file contains all functions needed to use bstreams.
*/
#include "oscar.h"
int byte_stream_new(ByteStream *bs, guint32 len)
{
if (bs == NULL)
return -1;
return byte_stream_init(bs, g_malloc(len), len);
}
int byte_stream_init(ByteStream *bs, guint8 *data, int len)
{
if (bs == NULL)
return -1;
bs->data = data;
bs->len = len;
bs->offset = 0;
return 0;
}
void byte_stream_destroy(ByteStream *bs)
{
g_free(bs->data);
}
int byte_stream_empty(ByteStream *bs)
{
return bs->len - bs->offset;
}
int byte_stream_curpos(ByteStream *bs)
{
return bs->offset;
}
int byte_stream_setpos(ByteStream *bs, unsigned int off)
{
if (off > bs->len)
return -1;
bs->offset = off;
return off;
}
void byte_stream_rewind(ByteStream *bs)
{
byte_stream_setpos(bs, 0);
return;
}
/*
* N can be negative, which can be used for going backwards
* in a bstream. I'm not sure if libfaim actually does
* this anywhere...
*/
int byte_stream_advance(ByteStream *bs, int n)
{
if ((byte_stream_curpos(bs) + n < 0) || (byte_stream_empty(bs) < n))
return 0; /* XXX throw an exception */
bs->offset += n;
return n;
}
guint8 byte_stream_get8(ByteStream *bs)
{
if (byte_stream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset++;
return aimutil_get8(bs->data + bs->offset - 1);
}
guint16 byte_stream_get16(ByteStream *bs)
{
if (byte_stream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += 2;
return aimutil_get16(bs->data + bs->offset - 2);
}
guint32 byte_stream_get32(ByteStream *bs)
{
if (byte_stream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += 4;
return aimutil_get32(bs->data + bs->offset - 4);
}
guint8 byte_stream_getle8(ByteStream *bs)
{
if (byte_stream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset++;
return aimutil_getle8(bs->data + bs->offset - 1);
}
guint16 byte_stream_getle16(ByteStream *bs)
{
if (byte_stream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += 2;
return aimutil_getle16(bs->data + bs->offset - 2);
}
guint32 byte_stream_getle32(ByteStream *bs)
{
if (byte_stream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += 4;
return aimutil_getle32(bs->data + bs->offset - 4);
}
static void byte_stream_getrawbuf_nocheck(ByteStream *bs, guint8 *buf, int len)
{
memcpy(buf, bs->data + bs->offset, len);
bs->offset += len;
}
int byte_stream_getrawbuf(ByteStream *bs, guint8 *buf, int len)
{
if (byte_stream_empty(bs) < len)
return 0;
byte_stream_getrawbuf_nocheck(bs, buf, len);
return len;
}
guint8 *byte_stream_getraw(ByteStream *bs, int len)
{
guint8 *ob;
if (byte_stream_empty(bs) < len)
return NULL;
ob = g_malloc(len);
byte_stream_getrawbuf_nocheck(bs, ob, len);
return ob;
}
char *byte_stream_getstr(ByteStream *bs, int len)
{
char *ob;
if (byte_stream_empty(bs) < len)
return NULL;
ob = g_malloc(len + 1);
byte_stream_getrawbuf_nocheck(bs, (guint8 *)ob, len);
ob[len] = '\0';
return ob;
}
int byte_stream_put8(ByteStream *bs, guint8 v)
{
if (byte_stream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset += aimutil_put8(bs->data + bs->offset, v);
return 1;
}
int byte_stream_put16(ByteStream *bs, guint16 v)
{
if (byte_stream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += aimutil_put16(bs->data + bs->offset, v);
return 2;
}
int byte_stream_put32(ByteStream *bs, guint32 v)
{
if (byte_stream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += aimutil_put32(bs->data + bs->offset, v);
return 1;
}
int byte_stream_putle8(ByteStream *bs, guint8 v)
{
if (byte_stream_empty(bs) < 1)
return 0; /* XXX throw an exception */
bs->offset += aimutil_putle8(bs->data + bs->offset, v);
return 1;
}
int byte_stream_putle16(ByteStream *bs, guint16 v)
{
if (byte_stream_empty(bs) < 2)
return 0; /* XXX throw an exception */
bs->offset += aimutil_putle16(bs->data + bs->offset, v);
return 2;
}
int byte_stream_putle32(ByteStream *bs, guint32 v)
{
if (byte_stream_empty(bs) < 4)
return 0; /* XXX throw an exception */
bs->offset += aimutil_putle32(bs->data + bs->offset, v);
return 1;
}
int byte_stream_putraw(ByteStream *bs, const guint8 *v, int len)
{
if (byte_stream_empty(bs) < len)
return 0; /* XXX throw an exception */
memcpy(bs->data + bs->offset, v, len);
bs->offset += len;
return len;
}
int byte_stream_putstr(ByteStream *bs, const char *str)
{
return byte_stream_putraw(bs, (guint8 *)str, strlen(str));
}
int byte_stream_putbs(ByteStream *bs, ByteStream *srcbs, int len)
{
if (byte_stream_empty(srcbs) < len)
return 0; /* XXX throw exception (underrun) */
if (byte_stream_empty(bs) < len)
return 0; /* XXX throw exception (overflow) */
memcpy(bs->data + bs->offset, srcbs->data + srcbs->offset, len);
bs->offset += len;
srcbs->offset += len;
return len;
}
int byte_stream_putuid(ByteStream *bs, OscarData *od)
{
PurpleAccount *account;
account = purple_connection_get_account(od->gc);
return byte_stream_putle32(bs, atoi(purple_account_get_username(account)));
}
void byte_stream_put_bart_asset(ByteStream *bs, guint16 type, ByteStream *data)
{
byte_stream_put16(bs, type);
if (data != NULL && data->len > 0) {
/* Flags. 0x04 means "this asset has data attached to it" */
byte_stream_put8(bs, 0x04); /* Flags */
byte_stream_put8(bs, data->len); /* Length */
byte_stream_rewind(data);
byte_stream_putbs(bs, data, data->len); /* Data */
} else {
byte_stream_put8(bs, 0x00); /* No flags */
byte_stream_put8(bs, 0x00); /* Length */
/* No data */
}
}
void byte_stream_put_bart_asset_str(ByteStream *bs, guint16 type, const char *datastr)
{
ByteStream data;
size_t len = datastr != NULL ? strlen(datastr) : 0;
if (len > 0) {
byte_stream_new(&data, 2 + len + 2);
byte_stream_put16(&data, len); /* Length */
byte_stream_putstr(&data, datastr); /* String */
byte_stream_put16(&data, 0x0000); /* Unknown */
byte_stream_put_bart_asset(bs, type, &data);
byte_stream_destroy(&data);
} else {
byte_stream_put_bart_asset(bs, type, NULL);
}
}
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