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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
/* sax_buf.c
* Copyright (c) 2011, Peter Ohler
* All rights reserved.
*/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#include <sys/types.h>
#if HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#include <time.h>
#include <unistd.h>
#include "ox.h"
#include "ruby.h"
#include "sax.h"
#define BUF_PAD 4
static VALUE rescue_cb(VALUE rdr, VALUE err);
static VALUE io_cb(VALUE rdr);
static VALUE partial_io_cb(VALUE rdr);
static int read_from_io(Buf buf);
static int read_from_fd(Buf buf);
static int read_from_io_partial(Buf buf);
static int read_from_str(Buf buf);
void ox_sax_buf_init(Buf buf, VALUE io) {
volatile VALUE io_class = rb_obj_class(io);
VALUE rfd;
if (rb_cString == io_class) {
buf->read_func = read_from_str;
buf->in.str = StringValuePtr(io);
} else if (ox_stringio_class == io_class && 0 == FIX2INT(rb_funcall2(io, ox_pos_id, 0, 0))) {
volatile VALUE s = rb_funcall2(io, ox_string_id, 0, 0);
buf->read_func = read_from_str;
buf->in.str = StringValuePtr(s);
} else if (rb_cFile == io_class && Qnil != (rfd = rb_funcall(io, ox_fileno_id, 0))) {
buf->read_func = read_from_fd;
buf->in.fd = FIX2INT(rfd);
} else if (rb_respond_to(io, ox_readpartial_id)) {
buf->read_func = read_from_io_partial;
buf->in.io = io;
} else if (rb_respond_to(io, ox_read_id)) {
buf->read_func = read_from_io;
buf->in.io = io;
} else {
rb_raise(ox_arg_error_class, "sax_parser io argument must respond to readpartial() or read().\n");
}
buf->head = buf->base;
*buf->head = '\0';
buf->end = buf->head + sizeof(buf->base) - BUF_PAD;
buf->tail = buf->head;
buf->read_end = buf->head;
buf->pro = 0;
buf->str = 0;
buf->pos = 0;
buf->line = 1;
buf->col = 0;
buf->pro_pos = 1;
buf->pro_line = 1;
buf->pro_col = 0;
buf->dr = 0;
}
int ox_sax_buf_read(Buf buf) {
int err;
size_t shift = 0;
// if there is not much room to read into, shift or realloc a larger buffer.
if (buf->head < buf->tail && 4096 > buf->end - buf->tail) {
if (0 == buf->pro) {
shift = buf->tail - buf->head;
} else {
shift = buf->pro - buf->head - 1; // leave one character so we cab backup one
}
if (0 >= shift) { /* no space left so allocate more */
char *old = buf->head;
size_t size = buf->end - buf->head + BUF_PAD;
if (buf->head == buf->base) {
buf->head = ALLOC_N(char, size * 2);
memcpy(buf->head, old, size);
} else {
REALLOC_N(buf->head, char, size * 2);
}
buf->end = buf->head + size * 2 - BUF_PAD;
buf->tail = buf->head + (buf->tail - old);
buf->read_end = buf->head + (buf->read_end - old);
if (0 != buf->pro) {
buf->pro = buf->head + (buf->pro - old);
}
if (0 != buf->str) {
buf->str = buf->head + (buf->str - old);
}
} else {
memmove(buf->head, buf->head + shift, buf->read_end - (buf->head + shift));
buf->tail -= shift;
buf->read_end -= shift;
if (0 != buf->pro) {
buf->pro -= shift;
}
if (0 != buf->str) {
buf->str -= shift;
}
}
}
err = buf->read_func(buf);
*buf->read_end = '\0';
return err;
}
static VALUE rescue_cb(VALUE rbuf, VALUE err) {
VALUE err_class = rb_obj_class(err);
if (err_class != rb_eTypeError && err_class != rb_eEOFError) {
Buf buf = (Buf)rbuf;
// ox_sax_drive_cleanup(buf->dr); called after exiting protect
rb_raise(err, "at line %ld, column %ld\n", (long)buf->line, (long)buf->col);
}
return Qfalse;
}
static VALUE partial_io_cb(VALUE rbuf) {
Buf buf = (Buf)rbuf;
VALUE args[1];
VALUE rstr;
char *str;
size_t cnt;
args[0] = ULONG2NUM(buf->end - buf->tail);
rstr = rb_funcall2(buf->in.io, ox_readpartial_id, 1, args);
str = StringValuePtr(rstr);
cnt = strlen(str);
// printf("*** read partial %lu bytes, str: '%s'\n", cnt, str);
strcpy(buf->tail, str);
buf->read_end = buf->tail + cnt;
return Qtrue;
}
static VALUE io_cb(VALUE rbuf) {
Buf buf = (Buf)rbuf;
VALUE args[1];
VALUE rstr;
char *str;
size_t cnt;
args[0] = ULONG2NUM(buf->end - buf->tail);
rstr = rb_funcall2(buf->in.io, ox_read_id, 1, args);
str = StringValuePtr(rstr);
cnt = strlen(str);
// printf("*** read %lu bytes, str: '%s'\n", cnt, str);
strcpy(buf->tail, str);
buf->read_end = buf->tail + cnt;
return Qtrue;
}
static int read_from_io_partial(Buf buf) {
return (Qfalse == rb_rescue(partial_io_cb, (VALUE)buf, rescue_cb, (VALUE)buf));
}
static int read_from_io(Buf buf) {
return (Qfalse == rb_rescue(io_cb, (VALUE)buf, rescue_cb, (VALUE)buf));
}
static int read_from_fd(Buf buf) {
ssize_t cnt;
size_t max = buf->end - buf->tail;
cnt = read(buf->in.fd, buf->tail, max);
if (cnt < 0) {
ox_sax_drive_error(buf->dr, "failed to read from file");
return -1;
} else if (0 != cnt) {
buf->read_end = buf->tail + cnt;
}
return 0;
}
static int read_from_str(Buf buf) {
size_t max = buf->end - buf->tail - 1;
char *s;
size_t cnt;
if ('\0' == *buf->in.str) {
return -1;
}
cnt = strlen(buf->in.str) + 1;
if (max < cnt) {
cnt = max;
}
memcpy(buf->tail, buf->in.str, cnt);
s = buf->tail + cnt - 1;
*s = '\0';
cnt = s - buf->tail;
buf->in.str += cnt;
buf->read_end = buf->tail + cnt;
return 0;
}
|
