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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
#include "fitz-imp.h"
#include <string.h>
#include <errno.h>
#include <stdio.h>
int
fz_file_exists(fz_context *ctx, const char *path)
{
FILE *file = fz_fopen(path, "rb");
if (file)
fclose(file);
return !!file;
}
fz_stream *
fz_new_stream(fz_context *ctx, void *state, fz_stream_next_fn *next, fz_stream_close_fn *close)
{
fz_stream *stm = NULL;
fz_try(ctx)
{
stm = fz_malloc_struct(ctx, fz_stream);
}
fz_catch(ctx)
{
close(ctx, state);
fz_rethrow(ctx);
}
stm->refs = 1;
stm->error = 0;
stm->eof = 0;
stm->pos = 0;
stm->bits = 0;
stm->avail = 0;
stm->rp = NULL;
stm->wp = NULL;
stm->state = state;
stm->next = next;
stm->close = close;
stm->seek = NULL;
return stm;
}
fz_stream *
fz_keep_stream(fz_context *ctx, fz_stream *stm)
{
return fz_keep_imp(ctx, stm, &stm->refs);
}
void
fz_drop_stream(fz_context *ctx, fz_stream *stm)
{
if (fz_drop_imp(ctx, stm, &stm->refs))
{
if (stm->close)
stm->close(ctx, stm->state);
fz_free(ctx, stm);
}
}
/* File stream */
typedef struct fz_file_stream_s
{
FILE *file;
unsigned char buffer[4096];
} fz_file_stream;
static int next_file(fz_context *ctx, fz_stream *stm, size_t n)
{
fz_file_stream *state = stm->state;
/* n is only a hint, that we can safely ignore */
n = fread(state->buffer, 1, sizeof(state->buffer), state->file);
if (n < sizeof(state->buffer) && ferror(state->file))
fz_throw(ctx, FZ_ERROR_GENERIC, "read error: %s", strerror(errno));
stm->rp = state->buffer;
stm->wp = state->buffer + n;
stm->pos += (fz_off_t)n;
if (n == 0)
return EOF;
return *stm->rp++;
}
static void seek_file(fz_context *ctx, fz_stream *stm, fz_off_t offset, int whence)
{
fz_file_stream *state = stm->state;
fz_off_t n = fz_fseek(state->file, offset, whence);
if (n < 0)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot seek: %s", strerror(errno));
stm->pos = fz_ftell(state->file);
stm->rp = state->buffer;
stm->wp = state->buffer;
}
static void close_file(fz_context *ctx, void *state_)
{
fz_file_stream *state = state_;
int n = fclose(state->file);
if (n < 0)
fz_warn(ctx, "close error: %s", strerror(errno));
fz_free(ctx, state);
}
fz_stream *
fz_open_file_ptr(fz_context *ctx, FILE *file)
{
fz_stream *stm;
fz_file_stream *state = fz_malloc_struct(ctx, fz_file_stream);
state->file = file;
stm = fz_new_stream(ctx, state, next_file, close_file);
stm->seek = seek_file;
return stm;
}
fz_stream *
fz_open_file(fz_context *ctx, const char *name)
{
FILE *f;
#if defined(_WIN32) || defined(_WIN64)
char *s = (char*)name;
wchar_t *wname, *d;
int c;
d = wname = fz_malloc(ctx, (strlen(name)+1) * sizeof(wchar_t));
while (*s) {
s += fz_chartorune(&c, s);
*d++ = c;
}
*d = 0;
f = _wfopen(wname, L"rb");
fz_free(ctx, wname);
#else
f = fz_fopen(name, "rb");
#endif
if (f == NULL)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open %s: %s", name, strerror(errno));
return fz_open_file_ptr(ctx, f);
}
#if defined(_WIN32) || defined(_WIN64)
fz_stream *
fz_open_file_w(fz_context *ctx, const wchar_t *name)
{
FILE *f = _wfopen(name, L"rb");
if (f == NULL)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open file %ls: %s", name, strerror(errno));
return fz_open_file_ptr(ctx, f);
}
#endif
/* Memory stream */
static int next_buffer(fz_context *ctx, fz_stream *stm, size_t max)
{
return EOF;
}
static void seek_buffer(fz_context *ctx, fz_stream *stm, fz_off_t offset, int whence)
{
fz_off_t pos = stm->pos - (stm->wp - stm->rp);
/* Convert to absolute pos */
if (whence == 1)
{
offset += pos; /* Was relative to current pos */
}
else if (whence == 2)
{
offset += stm->pos; /* Was relative to end */
}
if (offset < 0)
offset = 0;
if (offset > stm->pos)
offset = stm->pos;
stm->rp += (int)(offset - pos);
}
static void close_buffer(fz_context *ctx, void *state_)
{
fz_buffer *state = (fz_buffer *)state_;
fz_drop_buffer(ctx, state);
}
fz_stream *
fz_open_buffer(fz_context *ctx, fz_buffer *buf)
{
fz_stream *stm;
fz_keep_buffer(ctx, buf);
stm = fz_new_stream(ctx, buf, next_buffer, close_buffer);
stm->seek = seek_buffer;
stm->rp = buf->data;
stm->wp = buf->data + buf->len;
stm->pos = (fz_off_t)buf->len;
return stm;
}
fz_stream *
fz_open_memory(fz_context *ctx, const unsigned char *data, size_t len)
{
fz_stream *stm;
stm = fz_new_stream(ctx, NULL, next_buffer, close_buffer);
stm->seek = seek_buffer;
stm->rp = (unsigned char *)data;
stm->wp = (unsigned char *)data + len;
stm->pos = (fz_off_t)len;
return stm;
}
|
