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
|
#include "fitz.h"
int
fz_read(fz_stream *stm, unsigned char *buf, int len)
{
int count, n;
count = MIN(len, stm->wp - stm->rp);
if (count)
{
memcpy(buf, stm->rp, count);
stm->rp += count;
}
if (count == len || stm->error || stm->eof)
return count;
assert(stm->rp == stm->wp);
if (len - count < stm->ep - stm->bp)
{
n = stm->read(stm, stm->bp, stm->ep - stm->bp);
if (n < 0)
{
stm->error = 1;
return fz_error_note(n, "read error");
}
else if (n == 0)
{
stm->eof = 1;
}
else if (n > 0)
{
stm->rp = stm->bp;
stm->wp = stm->bp + n;
stm->pos += n;
}
n = MIN(len - count, stm->wp - stm->rp);
if (n)
{
memcpy(buf + count, stm->rp, n);
stm->rp += n;
count += n;
}
}
else
{
n = stm->read(stm, buf + count, len - count);
if (n < 0)
{
stm->error = 1;
return fz_error_note(n, "read error");
}
else if (n == 0)
{
stm->eof = 1;
}
else if (n > 0)
{
stm->pos += n;
count += n;
}
}
return count;
}
void
fz_fill_buffer(fz_stream *stm)
{
int n;
assert(stm->rp == stm->wp);
if (stm->error || stm->eof)
return;
n = stm->read(stm, stm->bp, stm->ep - stm->bp);
if (n < 0)
{
stm->error = 1;
fz_error_handle(n, "read error; treating as end of file");
}
else if (n == 0)
{
stm->eof = 1;
}
else if (n > 0)
{
stm->rp = stm->bp;
stm->wp = stm->bp + n;
stm->pos += n;
}
}
fz_buffer *
fz_read_all(fz_stream *stm, int initial)
{
fz_buffer *buf;
int n;
fz_context *ctx = stm->ctx;
if (initial < 1024)
initial = 1024;
buf = fz_new_buffer(ctx, initial);
while (1)
{
if (buf->len == buf->cap)
fz_grow_buffer(ctx, buf);
if (buf->len / 200 > initial)
{
fz_drop_buffer(ctx, buf);
fz_throw(ctx, "compression bomb detected");
}
n = fz_read(stm, buf->data + buf->len, buf->cap - buf->len);
if (n < 0)
{
fz_drop_buffer(ctx, buf);
fz_throw(ctx, "read error");
}
if (n == 0)
break;
buf->len += n;
}
return buf;
}
void
fz_read_line(fz_stream *stm, char *mem, int n)
{
char *s = mem;
int c = EOF;
while (n > 1)
{
c = fz_read_byte(stm);
if (c == EOF)
break;
if (c == '\r') {
c = fz_peek_byte(stm);
if (c == '\n')
fz_read_byte(stm);
break;
}
if (c == '\n')
break;
*s++ = c;
n--;
}
if (n)
*s = '\0';
}
int
fz_tell(fz_stream *stm)
{
return stm->pos - (stm->wp - stm->rp);
}
void
fz_seek(fz_stream *stm, int offset, int whence)
{
if (stm->seek)
{
if (whence == 1)
{
offset = fz_tell(stm) + offset;
whence = 0;
}
if (whence == 0)
{
int dist = stm->pos - offset;
if (dist >= 0 && dist <= stm->wp - stm->bp)
{
stm->rp = stm->wp - dist;
stm->eof = 0;
return;
}
}
stm->seek(stm, offset, whence);
stm->eof = 0;
}
else if (whence != 2)
{
if (whence == 0)
offset -= fz_tell(stm);
if (offset < 0)
fz_warn(stm->ctx, "cannot seek backwards");
/* dog slow, but rare enough */
while (offset-- > 0)
fz_read_byte(stm);
}
else
fz_warn(stm->ctx, "cannot seek");
}
|
