1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
/*
* Copyright (c) 2009-2021, Google LLC
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Google LLC nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "upb/message/message.h"
#include <math.h>
#include "upb/base/log2.h"
#include "upb/message/internal.h"
// Must be last.
#include "upb/port/def.inc"
const float kUpb_FltInfinity = INFINITY;
const double kUpb_Infinity = INFINITY;
const double kUpb_NaN = NAN;
static const size_t overhead = sizeof(upb_Message_InternalData);
upb_Message* upb_Message_New(const upb_MiniTable* mini_table,
upb_Arena* arena) {
return _upb_Message_New(mini_table, arena);
}
static bool realloc_internal(upb_Message* msg, size_t need, upb_Arena* arena) {
upb_Message_Internal* in = upb_Message_Getinternal(msg);
if (!in->internal) {
/* No internal data, allocate from scratch. */
size_t size = UPB_MAX(128, upb_Log2CeilingSize(need + overhead));
upb_Message_InternalData* internal = upb_Arena_Malloc(arena, size);
if (!internal) return false;
internal->size = size;
internal->unknown_end = overhead;
internal->ext_begin = size;
in->internal = internal;
} else if (in->internal->ext_begin - in->internal->unknown_end < need) {
/* Internal data is too small, reallocate. */
size_t new_size = upb_Log2CeilingSize(in->internal->size + need);
size_t ext_bytes = in->internal->size - in->internal->ext_begin;
size_t new_ext_begin = new_size - ext_bytes;
upb_Message_InternalData* internal =
upb_Arena_Realloc(arena, in->internal, in->internal->size, new_size);
if (!internal) return false;
if (ext_bytes) {
/* Need to move extension data to the end. */
char* ptr = (char*)internal;
memmove(ptr + new_ext_begin, ptr + internal->ext_begin, ext_bytes);
}
internal->ext_begin = new_ext_begin;
internal->size = new_size;
in->internal = internal;
}
UPB_ASSERT(in->internal->ext_begin - in->internal->unknown_end >= need);
return true;
}
bool _upb_Message_AddUnknown(upb_Message* msg, const char* data, size_t len,
upb_Arena* arena) {
if (!realloc_internal(msg, len, arena)) return false;
upb_Message_Internal* in = upb_Message_Getinternal(msg);
memcpy(UPB_PTR_AT(in->internal, in->internal->unknown_end, char), data, len);
in->internal->unknown_end += len;
return true;
}
void _upb_Message_DiscardUnknown_shallow(upb_Message* msg) {
upb_Message_Internal* in = upb_Message_Getinternal(msg);
if (in->internal) {
in->internal->unknown_end = overhead;
}
}
const char* upb_Message_GetUnknown(const upb_Message* msg, size_t* len) {
const upb_Message_Internal* in = upb_Message_Getinternal(msg);
if (in->internal) {
*len = in->internal->unknown_end - overhead;
return (char*)(in->internal + 1);
} else {
*len = 0;
return NULL;
}
}
void upb_Message_DeleteUnknown(upb_Message* msg, const char* data, size_t len) {
upb_Message_Internal* in = upb_Message_Getinternal(msg);
const char* internal_unknown_end =
UPB_PTR_AT(in->internal, in->internal->unknown_end, char);
#ifndef NDEBUG
size_t full_unknown_size;
const char* full_unknown = upb_Message_GetUnknown(msg, &full_unknown_size);
UPB_ASSERT((uintptr_t)data >= (uintptr_t)full_unknown);
UPB_ASSERT((uintptr_t)data < (uintptr_t)(full_unknown + full_unknown_size));
UPB_ASSERT((uintptr_t)(data + len) > (uintptr_t)data);
UPB_ASSERT((uintptr_t)(data + len) <= (uintptr_t)internal_unknown_end);
#endif
if ((data + len) != internal_unknown_end) {
memmove((char*)data, data + len, internal_unknown_end - data - len);
}
in->internal->unknown_end -= len;
}
const upb_Message_Extension* _upb_Message_Getexts(const upb_Message* msg,
size_t* count) {
const upb_Message_Internal* in = upb_Message_Getinternal(msg);
if (in->internal) {
*count = (in->internal->size - in->internal->ext_begin) /
sizeof(upb_Message_Extension);
return UPB_PTR_AT(in->internal, in->internal->ext_begin, void);
} else {
*count = 0;
return NULL;
}
}
const upb_Message_Extension* _upb_Message_Getext(
const upb_Message* msg, const upb_MiniTableExtension* e) {
size_t n;
const upb_Message_Extension* ext = _upb_Message_Getexts(msg, &n);
/* For now we use linear search exclusively to find extensions. If this
* becomes an issue due to messages with lots of extensions, we can introduce
* a table of some sort. */
for (size_t i = 0; i < n; i++) {
if (ext[i].ext == e) {
return &ext[i];
}
}
return NULL;
}
upb_Message_Extension* _upb_Message_GetOrCreateExtension(
upb_Message* msg, const upb_MiniTableExtension* e, upb_Arena* arena) {
upb_Message_Extension* ext =
(upb_Message_Extension*)_upb_Message_Getext(msg, e);
if (ext) return ext;
if (!realloc_internal(msg, sizeof(upb_Message_Extension), arena)) return NULL;
upb_Message_Internal* in = upb_Message_Getinternal(msg);
in->internal->ext_begin -= sizeof(upb_Message_Extension);
ext = UPB_PTR_AT(in->internal, in->internal->ext_begin, void);
memset(ext, 0, sizeof(upb_Message_Extension));
ext->ext = e;
return ext;
}
size_t upb_Message_ExtensionCount(const upb_Message* msg) {
size_t count;
_upb_Message_Getexts(msg, &count);
return count;
}
|
