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
|
/*
* Copyright (C) 2009-2020 MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "bson-native.h"
/**
* Allocates a bson byte buffer that wraps a byte_buffer_t.
*/
VALUE rb_bson_byte_buffer_allocate(VALUE klass)
{
byte_buffer_t *b;
VALUE obj = TypedData_Make_Struct(klass, byte_buffer_t, &rb_byte_buffer_data_type, b);
b->b_ptr = b->buffer;
b->size = BSON_BYTE_BUFFER_SIZE;
return obj;
}
/**
* Initialize a byte buffer.
*/
VALUE rb_bson_byte_buffer_initialize(int argc, VALUE *argv, VALUE self)
{
VALUE bytes;
rb_scan_args(argc, argv, "01", &bytes);
if (!NIL_P(bytes)) {
rb_bson_byte_buffer_put_bytes(self, bytes);
}
return self;
}
/**
* Expand the byte buffer linearly.
*/
void rb_bson_expand_buffer(byte_buffer_t* buffer_ptr, size_t length)
{
const size_t required_size = buffer_ptr->write_position - buffer_ptr->read_position + length;
if (required_size <= buffer_ptr->size) {
memmove(buffer_ptr->b_ptr, READ_PTR(buffer_ptr), READ_SIZE(buffer_ptr));
buffer_ptr->write_position -= buffer_ptr->read_position;
buffer_ptr->read_position = 0;
} else {
char *new_b_ptr;
const size_t new_size = required_size * 2;
new_b_ptr = ALLOC_N(char, new_size);
memcpy(new_b_ptr, READ_PTR(buffer_ptr), READ_SIZE(buffer_ptr));
if (buffer_ptr->b_ptr != buffer_ptr->buffer) {
xfree(buffer_ptr->b_ptr);
}
buffer_ptr->b_ptr = new_b_ptr;
buffer_ptr->size = new_size;
buffer_ptr->write_position -= buffer_ptr->read_position;
buffer_ptr->read_position = 0;
}
}
/**
* Free the memory for the byte buffer.
*/
void rb_bson_byte_buffer_free(void *ptr)
{
byte_buffer_t *b = ptr;
if (b->b_ptr != b->buffer) {
xfree(b->b_ptr);
}
xfree(b);
}
/**
* Get the length of the buffer.
*/
VALUE rb_bson_byte_buffer_length(VALUE self)
{
byte_buffer_t *b;
TypedData_Get_Struct(self, byte_buffer_t, &rb_byte_buffer_data_type, b);
return UINT2NUM(READ_SIZE(b));
}
/* The docstring is in init.c. */
VALUE rb_bson_byte_buffer_read_position(VALUE self)
{
byte_buffer_t *b;
TypedData_Get_Struct(self, byte_buffer_t, &rb_byte_buffer_data_type, b);
return INT2NUM(b->read_position);
}
/* The docstring is in init.c. */
VALUE rb_bson_byte_buffer_rewind(VALUE self)
{
byte_buffer_t *b;
TypedData_Get_Struct(self, byte_buffer_t, &rb_byte_buffer_data_type, b);
b->read_position = 0;
return self;
}
/* The docstring is in init.c. */
VALUE rb_bson_byte_buffer_write_position(VALUE self)
{
byte_buffer_t *b;
TypedData_Get_Struct(self, byte_buffer_t, &rb_byte_buffer_data_type, b);
return INT2NUM(b->write_position);
}
/* The docstring is in init.c. */
VALUE rb_bson_byte_buffer_to_s(VALUE self)
{
byte_buffer_t *b;
TypedData_Get_Struct(self, byte_buffer_t, &rb_byte_buffer_data_type, b);
return rb_str_new(READ_PTR(b), READ_SIZE(b));
}
/**
* Get the size of the byte_buffer_t in memory.
*/
size_t rb_bson_byte_buffer_memsize(const void *ptr)
{
return ptr ? sizeof(byte_buffer_t) : 0;
}
|
