parse_prs.c

来自「samba-3.0.22.tar.gz 编译smb服务器的源码」· C语言 代码 · 共 1,734 行 · 第 1/4 页

	DEBUG(5,("\n"));

	ps->data_offset += (len * sizeof(uint16));

	return True;
}

/******************************************************************
 Start using a function for streaming unicode chars. If unmarshalling,
 output must be little-endian, if marshalling, input must be little-endian.
 ********************************************************************/

static void dbg_rw_punival(BOOL charmode, const char *name, int depth, prs_struct *ps,
							char *in_buf, char *out_buf, int len)
{
	int i;

	if (UNMARSHALLING(ps)) {
		if (ps->bigendian_data) {
			for (i = 0; i < len; i++)
				SSVAL(out_buf,2*i,RSVAL(in_buf, 2*i));
		} else {
			for (i = 0; i < len; i++)
				SSVAL(out_buf, 2*i, SVAL(in_buf, 2*i));
		}
	} else {
		if (ps->bigendian_data) {
			for (i = 0; i < len; i++)
				RSSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
		} else {
			for (i = 0; i < len; i++)
				SSVAL(in_buf, 2*i, SVAL(out_buf,2*i));
		}
	}

	DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
	if (charmode)
		print_asc(5, (unsigned char*)out_buf, 2*len);
	else {
		for (i = 0; i < len; i++)
			DEBUG(5,("%04x ", out_buf[i]));
	}
	DEBUG(5,("\n"));
}

/******************************************************************
 Stream a unistr. Always little endian.
 ********************************************************************/

BOOL prs_uint16uni(BOOL charmode, const char *name, prs_struct *ps, int depth, uint16 *data16s, int len)
{
	char *q = prs_mem_get(ps, len * sizeof(uint16));
	if (q == NULL)
		return False;

	dbg_rw_punival(charmode, name, depth, ps, q, (char *)data16s, len);
	ps->data_offset += (len * sizeof(uint16));

	return True;
}

/******************************************************************
 Stream an array of uint32s. Length is number of uint32s.
 ********************************************************************/

BOOL prs_uint32s(BOOL charmode, const char *name, prs_struct *ps, int depth, uint32 *data32s, int len)
{
	int i;
	char *q = prs_mem_get(ps, len * sizeof(uint32));
	if (q == NULL)
		return False;

	if (UNMARSHALLING(ps)) {
		if (ps->bigendian_data) {
			for (i = 0; i < len; i++)
				data32s[i] = RIVAL(q, 4*i);
		} else {
			for (i = 0; i < len; i++)
				data32s[i] = IVAL(q, 4*i);
		}
	} else {
		if (ps->bigendian_data) {
			for (i = 0; i < len; i++)
				RSIVAL(q, 4*i, data32s[i]);
		} else {
			for (i = 0; i < len; i++)
				SIVAL(q, 4*i, data32s[i]);
		}
	}

	DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
	if (charmode)
		print_asc(5, (unsigned char*)data32s, 4*len);
	else {
		for (i = 0; i < len; i++)
			DEBUG(5,("%08x ", data32s[i]));
	}
	DEBUG(5,("\n"));

	ps->data_offset += (len * sizeof(uint32));

	return True;
}

/******************************************************************
 Stream an array of unicode string, length/buffer specified separately,
 in uint16 chars. The unicode string is already in little-endian format.
 ********************************************************************/

BOOL prs_buffer5(BOOL charmode, const char *name, prs_struct *ps, int depth, BUFFER5 *str)
{
	char *p;
	char *q = prs_mem_get(ps, str->buf_len * sizeof(uint16));
	if (q == NULL)
		return False;

	if (UNMARSHALLING(ps)) {
		str->buffer = PRS_ALLOC_MEM(ps,uint16,str->buf_len);
		if (str->buffer == NULL)
			return False;
	}

	/* If the string is empty, we don't have anything to stream */
	if (str->buf_len==0)
		return True;

	p = (char *)str->buffer;

	dbg_rw_punival(charmode, name, depth, ps, q, p, str->buf_len);
	
	ps->data_offset += (str->buf_len * sizeof(uint16));

	return True;
}

/******************************************************************
 Stream a "not" unicode string, length/buffer specified separately,
 in byte chars. String is in little-endian format.
 ********************************************************************/

BOOL prs_regval_buffer(BOOL charmode, const char *name, prs_struct *ps, int depth, REGVAL_BUFFER *buf)
{
	char *p;
	char *q = prs_mem_get(ps, buf->buf_len);
	if (q == NULL)
		return False;

	if (UNMARSHALLING(ps)) {
		if (buf->buf_len > buf->buf_max_len) {
			return False;
		}
		if ( buf->buf_max_len ) {
			buf->buffer = PRS_ALLOC_MEM(ps, uint16, buf->buf_max_len);
			if ( buf->buffer == NULL )
				return False;
		}
	}

	p = (char *)buf->buffer;

	dbg_rw_punival(charmode, name, depth, ps, q, p, buf->buf_len/2);
	ps->data_offset += buf->buf_len;

	return True;
}

/******************************************************************
 Stream a string, length/buffer specified separately,
 in uint8 chars.
 ********************************************************************/

BOOL prs_string2(BOOL charmode, const char *name, prs_struct *ps, int depth, STRING2 *str)
{
	unsigned int i;
	char *q = prs_mem_get(ps, str->str_str_len);
	if (q == NULL)
		return False;

	if (UNMARSHALLING(ps)) {
		if (str->str_str_len > str->str_max_len) {
			return False;
		}
		str->buffer = PRS_ALLOC_MEM(ps,unsigned char, str->str_max_len);
		if (str->buffer == NULL)
			return False;
	}

	if (UNMARSHALLING(ps)) {
		for (i = 0; i < str->str_str_len; i++)
			str->buffer[i] = CVAL(q,i);
	} else {
		for (i = 0; i < str->str_str_len; i++)
			SCVAL(q, i, str->buffer[i]);
	}

	DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
	if (charmode)
		print_asc(5, (unsigned char*)str->buffer, str->str_str_len);
	else {
		for (i = 0; i < str->str_str_len; i++)
			DEBUG(5,("%02x ", str->buffer[i]));
	}
	DEBUG(5,("\n"));

	ps->data_offset += str->str_str_len;

	return True;
}

/******************************************************************
 Stream a unicode string, length/buffer specified separately,
 in uint16 chars. The unicode string is already in little-endian format.
 ********************************************************************/

BOOL prs_unistr2(BOOL charmode, const char *name, prs_struct *ps, int depth, UNISTR2 *str)
{
	char *p;
	char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
	if (q == NULL)
		return False;

	/* If the string is empty, we don't have anything to stream */
	if (str->uni_str_len==0)
		return True;

	if (UNMARSHALLING(ps)) {
		if (str->uni_str_len > str->uni_max_len) {
			return False;
		}
		str->buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_max_len);
		if (str->buffer == NULL)
			return False;
	}

	p = (char *)str->buffer;

	dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
	
	ps->data_offset += (str->uni_str_len * sizeof(uint16));

	return True;
}

/******************************************************************
 Stream a unicode string, length/buffer specified separately,
 in uint16 chars. The unicode string is already in little-endian format.
 ********************************************************************/

BOOL prs_unistr3(BOOL charmode, const char *name, UNISTR3 *str, prs_struct *ps, int depth)
{
	char *p;
	char *q = prs_mem_get(ps, str->uni_str_len * sizeof(uint16));
	if (q == NULL)
		return False;

	if (UNMARSHALLING(ps)) {
		str->str.buffer = PRS_ALLOC_MEM(ps,uint16,str->uni_str_len);
		if (str->str.buffer == NULL)
			return False;
	}

	p = (char *)str->str.buffer;

	dbg_rw_punival(charmode, name, depth, ps, q, p, str->uni_str_len);
	ps->data_offset += (str->uni_str_len * sizeof(uint16));

	return True;
}

/*******************************************************************
 Stream a unicode  null-terminated string. As the string is already
 in little-endian format then do it as a stream of bytes.
 ********************************************************************/

BOOL prs_unistr(const char *name, prs_struct *ps, int depth, UNISTR *str)
{
	unsigned int len = 0;
	unsigned char *p = (unsigned char *)str->buffer;
	uint8 *start;
	char *q;
	uint32 max_len;
	uint16* ptr;

	if (MARSHALLING(ps)) {

		for(len = 0; str->buffer[len] != 0; len++)
			;

		q = prs_mem_get(ps, (len+1)*2);
		if (q == NULL)
			return False;

		start = (uint8*)q;

		for(len = 0; str->buffer[len] != 0; len++) {
			if(ps->bigendian_data) {
				/* swap bytes - p is little endian, q is big endian. */
				q[0] = (char)p[1];
				q[1] = (char)p[0];
				p += 2;
				q += 2;
			} 
			else 
			{
				q[0] = (char)p[0];
				q[1] = (char)p[1];
				p += 2;
				q += 2;
			}
		}

		/*
		 * even if the string is 'empty' (only an \0 char)
		 * at this point the leading \0 hasn't been parsed.
		 * so parse it now
		 */

		q[0] = 0;
		q[1] = 0;
		q += 2;

		len++;

		DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
		print_asc(5, (unsigned char*)start, 2*len);	
		DEBUG(5, ("\n"));
	}
	else { /* unmarshalling */
	
		uint32 alloc_len = 0;
		q = ps->data_p + prs_offset(ps);

		/*
		 * Work out how much space we need and talloc it.
		 */
		max_len = (ps->buffer_size - ps->data_offset)/sizeof(uint16);

		/* the test of the value of *ptr helps to catch the circumstance
		   where we have an emtpty (non-existent) string in the buffer */
		for ( ptr = (uint16 *)q; *ptr++ && (alloc_len <= max_len); alloc_len++)
			/* do nothing */ 
			;

		if (alloc_len < max_len)
			alloc_len += 1;

		/* should we allocate anything at all? */
		str->buffer = PRS_ALLOC_MEM(ps,uint16,alloc_len);
		if ((str->buffer == NULL) && (alloc_len > 0))
			return False;

		p = (unsigned char *)str->buffer;

		len = 0;
		/* the (len < alloc_len) test is to prevent us from overwriting
		   memory that is not ours...if we get that far, we have a non-null
		   terminated string in the buffer and have messed up somewhere */
		while ((len < alloc_len) && (*(uint16 *)q != 0)) {
			if(ps->bigendian_data) 
			{
				/* swap bytes - q is big endian, p is little endian. */
				p[0] = (unsigned char)q[1];
				p[1] = (unsigned char)q[0];
				p += 2;
				q += 2;
			} else {

				p[0] = (unsigned char)q[0];
				p[1] = (unsigned char)q[1];
				p += 2;
				q += 2;
			}

			len++;
		} 
		if (len < alloc_len) {
			/* NULL terminate the UNISTR */
			str->buffer[len++] = '\0';
		}

		DEBUG(5,("%s%04x %s: ", tab_depth(depth), ps->data_offset, name));
		print_asc(5, (unsigned char*)str->buffer, 2*len);	
		DEBUG(5, ("\n"));
	}

	/* set the offset in the prs_struct; 'len' points to the
	   terminiating NULL in the UNISTR so we need to go one more
	   uint16 */
	ps->data_offset += (len)*2;
	
	return True;
}


/*******************************************************************
 Stream a null-terminated string.  len is strlen, and therefore does
 not include the null-termination character.
 ********************************************************************/

BOOL prs_string(const char *name, prs_struct *ps, int depth, char *str, int max_buf_size)
{
	char *q;
	int i;
	int len;

	if (UNMARSHALLING(ps))
		len = strlen(&ps->data_p[ps->data_offset]);
	else
		len = strlen(str);

	len = MIN(len, (max_buf_size-1));

	q = prs_mem_get(ps, len+1);
	if (q == NULL)
		return False;

	for(i = 0; i < len; i++) {
		if (UNMARSHALLING(ps))
			str[i] = q[i];
		else
			q[i] = str[i];
	}

	/* The terminating null. */
	str[i] = '\0';

	if (MARSHALLING(ps)) {
		q[i] = '\0';
	}

	ps->data_offset += len+1;

	dump_data(5+depth, q, len);