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/*
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];
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;
}
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