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
|
/*
* 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;
}
static bool upb_stdio_read(upb_stdio *stdio, upb_string *str,
int offset, size_t bytes_to_read) {
char *buf = upb_string_getrwbuf(str, offset + bytes_to_read) + offset;
size_t read = fread(buf, 1, bytes_to_read, stdio->file);
if(read < bytes_to_read) {
// Error or EOF.
stdio->bytesrc.eof = feof(stdio->file);
if(ferror(stdio->file)) {
upb_seterr(&stdio->bytesrc.status, UPB_STATUS_ERROR,
"Error reading from stdio stream.");
return false;
}
// Resize to actual read size.
upb_string_getrwbuf(str, offset + read);
}
return true;
}
bool upb_stdio_get(upb_bytesrc *src, upb_string *str, upb_strlen_t minlen) {
// We ignore "minlen" since the stdio interfaces always return a full read
// unless they are at EOF.
(void)minlen;
return upb_stdio_read((upb_stdio*)src, str, 0, BLOCK_SIZE);
}
bool upb_stdio_append(upb_bytesrc *src, upb_string *str, upb_strlen_t len) {
return upb_stdio_read((upb_stdio*)src, str, upb_string_len(str), len);
}
int32_t upb_stdio_put(upb_bytesink *sink, upb_string *str) {
upb_stdio *stdio = (upb_stdio*)((char*)sink - offsetof(upb_stdio, bytesink));
upb_strlen_t len = upb_string_len(str);
size_t written = fwrite(upb_string_getrobuf(str), 1, len, stdio->file);
if(written < len) {
// Error or EOF.
stdio->bytesink.eof = feof(stdio->file);
if(ferror(stdio->file)) {
upb_seterr(&stdio->bytesink.status, UPB_STATUS_ERROR,
"Error writing to stdio stream.");
return 0;
}
}
return written;
}
static upb_bytesrc_vtable upb_stdio_bytesrc_vtbl = {
(upb_bytesrc_get_fptr)upb_stdio_get,
(upb_bytesrc_append_fptr)upb_stdio_append,
};
static upb_bytesink_vtable upb_stdio_bytesink_vtbl = {
upb_stdio_put
};
upb_stdio *upb_stdio_new() {
upb_stdio *stdio = malloc(sizeof(*stdio));
upb_bytesrc_init(&stdio->bytesrc, &upb_stdio_bytesrc_vtbl);
upb_bytesink_init(&stdio->bytesink, &upb_stdio_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; }
|
