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
|
/*
* upb - a minimalist implementation of protocol buffers.
*
* Copyright (c) 2010 Joshua Haberman. See LICENSE for details.
*/
#include "upb_stdio.h"
#include <stddef.h>
#include <stdlib.h>
#include "upb_string.h"
// We can make this configurable if necessary.
#define BLOCK_SIZE 4096
struct upb_stdio {
upb_bytesrc bytesrc;
upb_bytesink bytesink;
FILE *file;
};
void upb_stdio_reset(upb_stdio *stdio, FILE* file) {
stdio->file = file;
}
/* upb_bytesrc methods ********************************************************/
static upb_strlen_t upb_stdio_read(upb_bytesrc *src, void *buf,
upb_strlen_t count, upb_status *status) {
upb_stdio *stdio = (upb_stdio*)src;
assert(count > 0);
size_t read = fread(buf, 1, count, stdio->file);
if(read < (size_t)count) {
// Error or EOF.
if(feof(stdio->file)) {
upb_seterr(status, UPB_EOF, "");
return read;
} else if(ferror(stdio->file)) {
upb_seterr(status, UPB_ERROR, "Error reading from stdio stream.");
return -1;
}
}
return read;
}
static bool upb_stdio_getstr(upb_bytesrc *src, upb_string *str,
upb_status *status) {
upb_strlen_t read = upb_stdio_read(
src, upb_string_getrwbuf(str, BLOCK_SIZE), BLOCK_SIZE, status);
if (read <= 0) return false;
upb_string_getrwbuf(str, read);
return true;
}
/* upb_bytesink methods *******************************************************/
upb_strlen_t upb_stdio_putstr(upb_bytesink *sink, upb_string *str, upb_status *status) {
upb_stdio *stdio = (upb_stdio*)((char*)sink - offsetof(upb_stdio, bytesink));
upb_strlen_t len = upb_string_len(str);
upb_strlen_t written = fwrite(upb_string_getrobuf(str), 1, len, stdio->file);
if(written < len) {
upb_seterr(status, UPB_ERROR, "Error writing to stdio stream.");
return -1;
}
return written;
}
upb_strlen_t upb_stdio_vprintf(upb_bytesink *sink, upb_status *status,
const char *fmt, va_list args) {
upb_stdio *stdio = (upb_stdio*)((char*)sink - offsetof(upb_stdio, bytesink));
upb_strlen_t written = vfprintf(stdio->file, fmt, args);
if (written < 0) {
upb_seterr(status, UPB_ERROR, "Error writing to stdio stream.");
return -1;
}
return written;
}
upb_stdio *upb_stdio_new() {
static upb_bytesrc_vtbl bytesrc_vtbl = {
upb_stdio_read,
upb_stdio_getstr,
};
static upb_bytesink_vtbl bytesink_vtbl = {
NULL,
upb_stdio_putstr,
upb_stdio_vprintf
};
upb_stdio *stdio = malloc(sizeof(*stdio));
upb_bytesrc_init(&stdio->bytesrc, &bytesrc_vtbl);
upb_bytesink_init(&stdio->bytesink, &bytesink_vtbl);
return stdio;
}
void upb_stdio_free(upb_stdio *stdio) {
free(stdio);
}
upb_bytesrc* upb_stdio_bytesrc(upb_stdio *stdio) { return &stdio->bytesrc; }
upb_bytesink* upb_stdio_bytesink(upb_stdio *stdio) { return &stdio->bytesink; }
|
