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
236
237
238
239
240
241
|
///////////////////////////////////////////////////////////////////////////////
//
/// \file suffix.c
/// \brief Checks filename suffix and creates the destination filename
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include "private.h"
// For case-insensitive filename suffix on case-insensitive systems
#if defined(TUKLIB_DOSLIKE) || defined(__VMS)
# define strcmp strcasecmp
#endif
static char *custom_suffix = NULL;
/// \brief Test if the char is a directory separator
static bool
is_dir_sep(char c)
{
#ifdef TUKLIB_DOSLIKE
return c == '/' || c == '\\' || c == ':';
#else
return c == '/';
#endif
}
/// \brief Test if the string contains a directory separator
static bool
has_dir_sep(const char *str)
{
#ifdef TUKLIB_DOSLIKE
return strpbrk(str, "/\\:") != NULL;
#else
return strchr(str, '/') != NULL;
#endif
}
/// \brief Checks if src_name has given compressed_suffix
///
/// \param suffix Filename suffix to look for
/// \param src_name Input filename
/// \param src_len strlen(src_name)
///
/// \return If src_name has the suffix, src_len - strlen(suffix) is
/// returned. It's always a positive integer. Otherwise zero
/// is returned.
static size_t
test_suffix(const char *suffix, const char *src_name, size_t src_len)
{
const size_t suffix_len = strlen(suffix);
// The filename must have at least one character in addition to
// the suffix. src_name may contain path to the filename, so we
// need to check for directory separator too.
if (src_len <= suffix_len
|| is_dir_sep(src_name[src_len - suffix_len - 1]))
return 0;
if (strcmp(suffix, src_name + src_len - suffix_len) == 0)
return src_len - suffix_len;
return 0;
}
/// \brief Removes the filename suffix of the compressed file
///
/// \return Name of the uncompressed file, or NULL if file has unknown
/// suffix.
static char *
uncompressed_name(const char *src_name, const size_t src_len)
{
static const struct {
const char *compressed;
const char *uncompressed;
} suffixes[] = {
{ ".xz", "" },
{ ".txz", ".tar" }, // .txz abbreviation for .txt.gz is rare.
{ ".lzma", "" },
{ ".tlz", ".tar" },
// { ".gz", "" },
// { ".tgz", ".tar" },
};
const char *new_suffix = "";
size_t new_len = 0;
if (opt_format == FORMAT_RAW) {
// Don't check for known suffixes when --format=raw was used.
if (custom_suffix == NULL) {
message_error(_("%s: With --format=raw, "
"--suffix=.SUF is required unless "
"writing to stdout"), src_name);
return NULL;
}
} else {
for (size_t i = 0; i < ARRAY_SIZE(suffixes); ++i) {
new_len = test_suffix(suffixes[i].compressed,
src_name, src_len);
if (new_len != 0) {
new_suffix = suffixes[i].uncompressed;
break;
}
}
}
if (new_len == 0 && custom_suffix != NULL)
new_len = test_suffix(custom_suffix, src_name, src_len);
if (new_len == 0) {
message_warning(_("%s: Filename has an unknown suffix, "
"skipping"), src_name);
return NULL;
}
const size_t new_suffix_len = strlen(new_suffix);
char *dest_name = xmalloc(new_len + new_suffix_len + 1);
memcpy(dest_name, src_name, new_len);
memcpy(dest_name + new_len, new_suffix, new_suffix_len);
dest_name[new_len + new_suffix_len] = '\0';
return dest_name;
}
/// \brief Appends suffix to src_name
///
/// In contrast to uncompressed_name(), we check only suffixes that are valid
/// for the specified file format.
static char *
compressed_name(const char *src_name, const size_t src_len)
{
// The order of these must match the order in args.h.
static const char *const all_suffixes[][3] = {
{
".xz",
".txz",
NULL
}, {
".lzma",
".tlz",
NULL
/*
}, {
".gz",
".tgz",
NULL
*/
}, {
// --format=raw requires specifying the suffix
// manually or using stdout.
NULL
}
};
// args.c ensures this.
assert(opt_format != FORMAT_AUTO);
const size_t format = opt_format - 1;
const char *const *suffixes = all_suffixes[format];
for (size_t i = 0; suffixes[i] != NULL; ++i) {
if (test_suffix(suffixes[i], src_name, src_len) != 0) {
message_warning(_("%s: File already has `%s' "
"suffix, skipping"), src_name,
suffixes[i]);
return NULL;
}
}
if (custom_suffix != NULL) {
if (test_suffix(custom_suffix, src_name, src_len) != 0) {
message_warning(_("%s: File already has `%s' "
"suffix, skipping"), src_name,
custom_suffix);
return NULL;
}
}
// TODO: Hmm, maybe it would be better to validate this in args.c,
// since the suffix handling when decoding is weird now.
if (opt_format == FORMAT_RAW && custom_suffix == NULL) {
message_error(_("%s: With --format=raw, "
"--suffix=.SUF is required unless "
"writing to stdout"), src_name);
return NULL;
}
const char *suffix = custom_suffix != NULL
? custom_suffix : suffixes[0];
const size_t suffix_len = strlen(suffix);
char *dest_name = xmalloc(src_len + suffix_len + 1);
memcpy(dest_name, src_name, src_len);
memcpy(dest_name + src_len, suffix, suffix_len);
dest_name[src_len + suffix_len] = '\0';
return dest_name;
}
extern char *
suffix_get_dest_name(const char *src_name)
{
assert(src_name != NULL);
// Length of the name is needed in all cases to locate the end of
// the string to compare the suffix, so calculate the length here.
const size_t src_len = strlen(src_name);
return opt_mode == MODE_COMPRESS
? compressed_name(src_name, src_len)
: uncompressed_name(src_name, src_len);
}
extern void
suffix_set(const char *suffix)
{
// Empty suffix and suffixes having a directory separator are
// rejected. Such suffixes would break things later.
if (suffix[0] == '\0' || has_dir_sep(suffix))
message_fatal(_("%s: Invalid filename suffix"), suffix);
// Replace the old custom_suffix (if any) with the new suffix.
free(custom_suffix);
custom_suffix = xstrdup(suffix);
return;
}
|
