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
|
/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*/
#include "upb_strstream.h"
#include <stdlib.h>
#include "upb_string.h"
struct upb_stringsrc {
upb_bytesrc bytesrc;
upb_string *str;
upb_strlen_t offset;
};
void upb_stringsrc_reset(upb_stringsrc *s, upb_string *str) {
if (str != s->str) {
if (s->str) upb_string_unref(s->str);
s->str = upb_string_getref(str);
}
s->bytesrc.eof = false;
}
void upb_stringsrc_free(upb_stringsrc *s) {
if (s->str) upb_string_unref(s->str);
free(s);
}
static upb_strlen_t upb_stringsrc_read(upb_bytesrc *_src, void *buf,
upb_strlen_t count, upb_status *status) {
upb_stringsrc *src = (upb_stringsrc*)_src;
if (src->offset == upb_string_len(src->str)) {
upb_seterr(status, UPB_EOF, "");
return -1;
} else {
upb_strlen_t to_read = UPB_MIN(count, upb_string_len(src->str) - src->offset);
memcpy(buf, upb_string_getrobuf(src->str) + src->offset, to_read);
src->offset += to_read;
return to_read;
}
}
static bool upb_stringsrc_getstr(upb_bytesrc *_src, upb_string *str,
upb_status *status) {
upb_stringsrc *src = (upb_stringsrc*)_src;
if (src->offset == upb_string_len(str)) {
upb_seterr(status, UPB_EOF, "");
return false;
} else {
upb_string_substr(str, src->str, 0, upb_string_len(src->str));
return true;
}
}
upb_stringsrc *upb_stringsrc_new() {
static upb_bytesrc_vtbl bytesrc_vtbl = {
upb_stringsrc_read,
upb_stringsrc_getstr,
};
upb_stringsrc *s = malloc(sizeof(*s));
s->str = NULL;
upb_bytesrc_init(&s->bytesrc, &bytesrc_vtbl);
return s;
}
upb_bytesrc *upb_stringsrc_bytesrc(upb_stringsrc *s) {
return &s->bytesrc;
}
|
