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
225
226
227
228
229
230
231
232
233
234
235
|
#include "mupdf/fitz.h"
typedef struct tar_entry_s tar_entry;
typedef struct fz_tar_archive_s fz_tar_archive;
struct tar_entry_s
{
char *name;
int offset, size;
};
struct fz_tar_archive_s
{
fz_archive super;
int count;
tar_entry *entries;
};
static inline int isoctdigit(char c)
{
return c >= '0' && c <= '7';
}
static inline int otoi(const char *s)
{
int value = 0;
while (*s && isoctdigit(*s))
{
value *= 8;
value += (*s) - '0';
s++;
}
return value;
}
static void drop_tar_archive(fz_context *ctx, fz_archive *arch)
{
fz_tar_archive *tar = (fz_tar_archive *) arch;
int i;
for (i = 0; i < tar->count; ++i)
fz_free(ctx, tar->entries[i].name);
fz_free(ctx, tar->entries);
}
static void ensure_tar_entries(fz_context *ctx, fz_tar_archive *tar)
{
fz_stream *file = tar->super.file;
char name[100];
char octsize[12];
char typeflag;
int offset, blocks, size;
size_t n;
tar->count = 0;
fz_seek(ctx, file, 0, SEEK_SET);
while (1)
{
offset = fz_tell(ctx, file);
n = fz_read(ctx, file, (unsigned char *) name, nelem(name));
if (n < nelem(name))
fz_throw(ctx, FZ_ERROR_GENERIC, "premature end of data in zip entry name");
name[nelem(name) - 1] = '\0';
if (strlen(name) == 0)
break;
fz_seek(ctx, file, 24, 1);
n = fz_read(ctx, file, (unsigned char *) octsize, nelem(octsize));
if (n < nelem(octsize))
fz_throw(ctx, FZ_ERROR_GENERIC, "premature end of data in zip entry size");
size = otoi(octsize);
fz_seek(ctx, file, 20, 1);
typeflag = fz_read_byte(ctx, file);
fz_seek(ctx, file, 355, 1);
blocks = (size + 511) / 512;
fz_seek(ctx, file, blocks * 512, 1);
if (typeflag != '0')
continue;
tar->entries = fz_resize_array(ctx, tar->entries, tar->count + 1, sizeof *tar->entries);
tar->entries[tar->count].name = fz_strdup(ctx, name);
tar->entries[tar->count].offset = offset;
tar->entries[tar->count].size = size;
tar->count++;
}
}
static tar_entry *lookup_tar_entry(fz_context *ctx, fz_tar_archive *tar, const char *name)
{
int i;
for (i = 0; i < tar->count; i++)
if (!fz_strcasecmp(name, tar->entries[i].name))
return &tar->entries[i];
return NULL;
}
static fz_stream *open_tar_entry(fz_context *ctx, fz_archive *arch, const char *name)
{
fz_tar_archive *tar = (fz_tar_archive *) arch;
fz_stream *file = tar->super.file;
tar_entry *ent;
ent = lookup_tar_entry(ctx, tar, name);
if (!ent)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find named tar archive entry");
fz_seek(ctx, file, ent->offset + 512, 0);
return fz_open_null(ctx, file, ent->size, fz_tell(ctx, file));
}
static fz_buffer *read_tar_entry(fz_context *ctx, fz_archive *arch, const char *name)
{
fz_tar_archive *tar = (fz_tar_archive *) arch;
fz_stream *file = tar->super.file;
fz_buffer *ubuf;
tar_entry *ent;
ent = lookup_tar_entry(ctx, tar, name);
if (!ent)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot find named tar archive entry");
ubuf = fz_new_buffer(ctx, ent->size);
fz_try(ctx)
{
fz_seek(ctx, file, ent->offset + 512, 0);
ubuf->len = fz_read(ctx, file, ubuf->data, ent->size);
if (ubuf->len != ent->size)
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot read entire archive entry");
}
fz_catch(ctx)
{
fz_drop_buffer(ctx, ubuf);
fz_rethrow(ctx);
}
return ubuf;
}
static int has_tar_entry(fz_context *ctx, fz_archive *arch, const char *name)
{
fz_tar_archive *tar = (fz_tar_archive *) arch;
tar_entry *ent = lookup_tar_entry(ctx, tar, name);
return ent != NULL;
}
static const char *list_tar_entry(fz_context *ctx, fz_archive *arch, int idx)
{
fz_tar_archive *tar = (fz_tar_archive *) arch;
if (idx < 0 || idx >= tar->count)
return NULL;
return tar->entries[idx].name;
}
static int count_tar_entries(fz_context *ctx, fz_archive *arch)
{
fz_tar_archive *tar = (fz_tar_archive *) arch;
return tar->count;
}
int
fz_is_tar_archive(fz_context *ctx, fz_stream *file)
{
const unsigned char signature[6] = { 'u', 's', 't', 'a', 'r', ' ' };
unsigned char data[6];
size_t n;
fz_seek(ctx, file, 257, 0);
n = fz_read(ctx, file, data, nelem(data));
if (n != nelem(signature))
return 0;
if (memcmp(data, signature, nelem(signature)))
return 0;
return 1;
}
fz_archive *
fz_open_tar_archive_with_stream(fz_context *ctx, fz_stream *file)
{
fz_tar_archive *tar;
if (!fz_is_tar_archive(ctx, file))
fz_throw(ctx, FZ_ERROR_GENERIC, "cannot recognize tar archive");
tar = fz_new_archive(ctx, file, fz_tar_archive);
fz_try(ctx)
{
tar->super.format = "tar";
tar->super.count_entries = count_tar_entries;
tar->super.list_entry = list_tar_entry;
tar->super.has_entry = has_tar_entry;
tar->super.read_entry = read_tar_entry;
tar->super.open_entry = open_tar_entry;
tar->super.drop_archive = drop_tar_archive;
ensure_tar_entries(ctx, tar);
}
fz_catch(ctx)
{
fz_drop_archive(ctx, &tar->super);
fz_rethrow(ctx);
}
return &tar->super;
}
fz_archive *
fz_open_tar_archive(fz_context *ctx, const char *filename)
{
fz_archive *tar = NULL;
fz_stream *file;
file = fz_open_file(ctx, filename);
fz_try(ctx)
tar = fz_open_tar_archive_with_stream(ctx, file);
fz_always(ctx)
fz_drop_stream(ctx, file);
fz_catch(ctx)
fz_rethrow(ctx);
return tar;
}
|
