rdesktop/stream.c
Pierre Ossman 3e340f2f20 Add explicit STREAM allocation function
Avoids mistakes by making sure everyone allocates these the same
way.

The smart card code still has manual allocation because it has it's
own magical memory management.
2019-05-06 14:33:05 +02:00

195 lines
4.0 KiB
C

/*
rdesktop: A Remote Desktop Protocol client.
Parsing primitives
Copyright 2017 Henrik Andersson <hean01@cendio.se> for Cendio AB
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <iconv.h>
#include <stdlib.h>
#include "rdesktop.h"
extern char g_codepage[16];
STREAM
s_alloc(unsigned int size)
{
STREAM s;
s = xmalloc(sizeof(struct stream));
memset(s, 0, sizeof(struct stream));
s_realloc(s, size);
return s;
}
void
s_realloc(STREAM s, unsigned int size)
{
unsigned char *data;
if (s->size >= size)
return;
data = s->data;
s->size = size;
s->data = xrealloc(data, size);
s->p = s->data + (s->p - data);
s->end = s->data + (s->end - data);
s->iso_hdr = s->data + (s->iso_hdr - data);
s->mcs_hdr = s->data + (s->mcs_hdr - data);
s->sec_hdr = s->data + (s->sec_hdr - data);
s->rdp_hdr = s->data + (s->rdp_hdr - data);
s->channel_hdr = s->data + (s->channel_hdr - data);
}
void
s_reset(STREAM s)
{
struct stream tmp;
tmp = *s;
memset(s, 0, sizeof(struct stream));
s->size = tmp.size;
s->end = s->p = s->data = tmp.data;
}
void
s_free(STREAM s)
{
free(s->data);
free(s);
}
static iconv_t
local_to_utf16()
{
iconv_t icv;
icv = iconv_open(WINDOWS_CODEPAGE, g_codepage);
if (icv == (iconv_t) - 1)
{
logger(Core, Error, "locale_to_utf16(), iconv_open[%s -> %s] fail %p",
g_codepage, WINDOWS_CODEPAGE, icv);
abort();
}
return icv;
}
/* Writes a utf16 encoded string into stream excluding null termination.
This function assumes that input is ASCII compatible, such as UTF-8.
*/
static inline size_t
_out_utf16s(STREAM s, size_t maxlength, const char *string)
{
static iconv_t icv_local_to_utf16;
size_t bl, ibl, obl;
const char *pin;
char *pout;
if (string == NULL)
return 0;
if (!icv_local_to_utf16)
{
icv_local_to_utf16 = local_to_utf16();
}
ibl = strlen(string);
obl = maxlength ? maxlength : (size_t) s_left(s);
pin = string;
pout = (char *) s->p;
if (iconv(icv_local_to_utf16, (char **) &pin, &ibl, &pout, &obl) == (size_t) - 1)
{
logger(Protocol, Error, "out_utf16s(), iconv(2) fail, errno %d", errno);
abort();
}
bl = (unsigned char *) pout - s->p;
s->p = (unsigned char *) pout;
return bl;
}
/* Writes a utf16 encoded string into stream including a null
termination. The length is fixed and defined by width. If result is
longer than specified width, the string is truncated. pad,
specifies a character to pad with.
*/
void
out_utf16s_padded(STREAM s, const char *string, size_t length, unsigned char pad)
{
size_t i, bl;
bl = _out_utf16s(s, length - 2, string);
// append utf16 null termination
out_uint16(s, 0);
bl += 2;
for (i = 0; i < (length - bl); i++)
out_uint8(s, pad);
}
/* Writes a utf16 encoded string into stream including a null
termination.
*/
void
out_utf16s(STREAM s, const char *string)
{
_out_utf16s(s, 0, string);
// append utf16 null termination
out_uint16(s, 0);
}
/* Writes a utf16 encoded string into stream excluding null
termination. */
void
out_utf16s_no_eos(STREAM s, const char *string)
{
_out_utf16s(s, 0, string);
}
/* Read bytes from STREAM s into *string until a null terminator is
found, or len bytes are read from the stream. Returns the number of
bytes read. */
size_t
in_ansi_string(STREAM s, char *string, size_t len)
{
char *ps;
size_t left;
ps = string;
left = len;
while (left--)
{
if (left == 0)
break;
in_uint8(s, *ps);
if (*ps == '\0')
break;
ps++;
}
return len - left;
}