1 /*
2  * Copyright 2009 VMware, Inc.
3  * All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * on the rights to use, copy, modify, merge, publish, distribute, sub
9  * license, and/or sell copies of the Software, and to permit persons to whom
10  * the Software is furnished to do so, subject to the following conditions:
11  *
12  * The above copyright notice and this permission notice (including the next
13  * paragraph) shall be included in all copies or substantial portions of the
14  * Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
19  * VMWARE AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
23  */
24 
25 /*
26  * This file is internal to the rbug protocol code, and contains asorted
27  * features needed by the code.
28  */
29 
30 #ifndef _RBUG_INTERNAL_H_
31 #define _RBUG_INTERNAL_H_
32 
33 #include "rbug_proto.h"
34 
35 #include "util/u_memory.h"
36 #include "util/u_debug.h"
37 #include <errno.h>
38 
39 int rbug_connection_send_start(struct rbug_connection *con, enum rbug_opcode opcode, uint32_t length);
40 int rbug_connection_write(struct rbug_connection *con, void *data, uint32_t size);
41 int rbug_connection_send_finish(struct rbug_connection *con, uint32_t *c);
42 
43 /**
44  * Only works with multiples of 2
45  */
46 #define PAD(from, to)                       \
47 do {                                        \
48 	from = (from + to - 1) & ~(to - 1); \
49 } while(0)
50 
51 #define LEN(size)         \
52 do {                      \
53 	PAD(__len, size); \
54 	__len += size;    \
55 } while(0)
56 
57 #define LEN_ARRAY(size, name)       \
58 do {                                \
59 	LEN(4);                     \
60 	PAD(__len, size);           \
61 	__len += size * name##_len; \
62 } while(0)
63 
64 #define WRITE(size, type, name)             \
65 do {                                        \
66 	PAD(__pos, size);                   \
67 	*((type *)(&__data[__pos])) = name; \
68 	__pos += size;                      \
69 } while(0)
70 
71 #define WRITE_ARRAY(size, type, name)                    \
72 do {                                                     \
73 	WRITE(4, uint32_t, name##_len);                  \
74 	PAD(__pos, size);                                \
75 	memcpy(&__data[__pos], name, size * name##_len); \
76 	__pos += size * name##_len;                      \
77 } while(0)
78 
79 #define READ(size, type, name)                      \
80 do {                                                \
81 	PAD(pos, size);                             \
82 	pos += size;                                \
83 	if (pos > len)                              \
84 		break;                              \
85 	ret->name = *((type *)(&data[pos - size])); \
86 } while(0)
87 
88 #define READ_ARRAY(size, type, name)                             \
89 do {                                                             \
90 	READ(4, uint32_t, name##_len);                           \
91 	if (pos > len)                                           \
92 		break;                                           \
93 	PAD(pos, size);                                          \
94 	pos += size * ret->name##_len;                           \
95 	if (pos > len)                                           \
96 		break;                                           \
97 	ret->name = (type *)&data[pos - size * ret->name##_len]; \
98 } while(0)
99 
100 #endif
101