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
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
|
/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* blob.c: Blob support by Yasuhiro Matsumoto
*/
#include "vim.h"
#if defined(FEAT_EVAL) || defined(PROTO)
/*
* Allocate an empty blob.
* Caller should take care of the reference count.
*/
blob_T *
blob_alloc(void)
{
blob_T *blob = (blob_T *)alloc_clear(sizeof(blob_T));
if (blob != NULL)
ga_init2(&blob->bv_ga, 1, 100);
return blob;
}
/*
* Allocate an empty blob for a return value, with reference count set.
* Returns OK or FAIL.
*/
int
rettv_blob_alloc(typval_T *rettv)
{
blob_T *b = blob_alloc();
if (b == NULL)
return FAIL;
rettv_blob_set(rettv, b);
return OK;
}
/*
* Set a blob as the return value.
*/
void
rettv_blob_set(typval_T *rettv, blob_T *b)
{
rettv->v_type = VAR_BLOB;
rettv->vval.v_blob = b;
if (b != NULL)
++b->bv_refcount;
}
int
blob_copy(typval_T *from, typval_T *to)
{
int ret = OK;
to->v_type = VAR_BLOB;
if (from->vval.v_blob == NULL)
to->vval.v_blob = NULL;
else if (rettv_blob_alloc(to) == FAIL)
ret = FAIL;
else
{
int len = from->vval.v_blob->bv_ga.ga_len;
if (len > 0)
{
to->vval.v_blob->bv_ga.ga_data =
vim_memsave(from->vval.v_blob->bv_ga.ga_data, len);
if (to->vval.v_blob->bv_ga.ga_data == NULL)
len = 0;
}
to->vval.v_blob->bv_ga.ga_len = len;
}
return ret;
}
void
blob_free(blob_T *b)
{
ga_clear(&b->bv_ga);
vim_free(b);
}
/*
* Unreference a blob: decrement the reference count and free it when it
* becomes zero.
*/
void
blob_unref(blob_T *b)
{
if (b != NULL && --b->bv_refcount <= 0)
blob_free(b);
}
/*
* Get the length of data.
*/
long
blob_len(blob_T *b)
{
if (b == NULL)
return 0L;
return b->bv_ga.ga_len;
}
/*
* Get byte "idx" in blob "b".
* Caller must check that "idx" is valid.
*/
int
blob_get(blob_T *b, int idx)
{
return ((char_u*)b->bv_ga.ga_data)[idx];
}
/*
* Store one byte "c" in blob "b" at "idx".
* Caller must make sure that "idx" is valid.
*/
void
blob_set(blob_T *b, int idx, char_u c)
{
((char_u*)b->bv_ga.ga_data)[idx] = c;
}
/*
* Return TRUE when two blobs have exactly the same values.
*/
int
blob_equal(
blob_T *b1,
blob_T *b2)
{
int i;
int len1 = blob_len(b1);
int len2 = blob_len(b2);
// empty and NULL are considered the same
if (len1 == 0 && len2 == 0)
return TRUE;
if (b1 == b2)
return TRUE;
if (len1 != len2)
return FALSE;
for (i = 0; i < b1->bv_ga.ga_len; i++)
if (blob_get(b1, i) != blob_get(b2, i)) return FALSE;
return TRUE;
}
/*
* Read "blob" from file "fd".
* Return OK or FAIL.
*/
int
read_blob(FILE *fd, blob_T *blob)
{
struct stat st;
if (fstat(fileno(fd), &st) < 0)
return FAIL;
if (ga_grow(&blob->bv_ga, st.st_size) == FAIL)
return FAIL;
blob->bv_ga.ga_len = st.st_size;
if (fread(blob->bv_ga.ga_data, 1, blob->bv_ga.ga_len, fd)
< (size_t)blob->bv_ga.ga_len)
return FAIL;
return OK;
}
/*
* Write "blob" to file "fd".
* Return OK or FAIL.
*/
int
write_blob(FILE *fd, blob_T *blob)
{
if (fwrite(blob->bv_ga.ga_data, 1, blob->bv_ga.ga_len, fd)
< (size_t)blob->bv_ga.ga_len)
{
emsg(_(e_write));
return FAIL;
}
return OK;
}
/*
* Convert a blob to a readable form: "0z00112233.44556677.8899"
*/
char_u *
blob2string(blob_T *blob, char_u **tofree, char_u *numbuf)
{
int i;
garray_T ga;
if (blob == NULL)
{
*tofree = NULL;
return (char_u *)"0z";
}
// Store bytes in the growarray.
ga_init2(&ga, 1, 4000);
ga_concat(&ga, (char_u *)"0z");
for (i = 0; i < blob_len(blob); i++)
{
if (i > 0 && (i & 3) == 0)
ga_concat(&ga, (char_u *)".");
vim_snprintf((char *)numbuf, NUMBUFLEN, "%02X", (int)blob_get(blob, i));
ga_concat(&ga, numbuf);
}
*tofree = ga.ga_data;
return *tofree;
}
/*
* Convert a string variable, in the format of blob2string(), to a blob.
* Return NULL when conversion failed.
*/
blob_T *
string2blob(char_u *str)
{
blob_T *blob = blob_alloc();
char_u *s = str;
if (s[0] != '0' || (s[1] != 'z' && s[1] != 'Z'))
goto failed;
s += 2;
while (vim_isxdigit(*s))
{
if (!vim_isxdigit(s[1]))
goto failed;
ga_append(&blob->bv_ga, (hex2nr(s[0]) << 4) + hex2nr(s[1]));
s += 2;
if (*s == '.' && vim_isxdigit(s[1]))
++s;
}
if (*skipwhite(s) != NUL)
goto failed; // text after final digit
++blob->bv_refcount;
return blob;
failed:
blob_free(blob);
return NULL;
}
#endif /* defined(FEAT_EVAL) */
|
