2 * WINGs WMData function library
4 * Copyright (c) 1999-2000 Dan Pascu
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 typedef struct W_Data
{
28 unsigned length
; /* How many bytes we have */
29 unsigned capacity
; /* How many bytes it can hold */
30 unsigned growth
; /* How much to grow */
31 void *bytes
; /* Actual data */
33 WMFreeDataProc
*destructor
;
34 int format
; /* 0, 8, 16 or 32 */
40 /* Creating and destroying data objects */
43 WMCreateDataWithCapacity(unsigned capacity
) /*FOLD00*/
47 aData
= (WMData
*)wmalloc(sizeof(WMData
));
50 aData
->bytes
= wmalloc(capacity
);
54 aData
->capacity
= capacity
;
55 aData
->growth
= capacity
/2 > 0 ? capacity
/2 : 1;
57 aData
->retainCount
= 1;
59 aData
->destructor
= wfree
;
66 WMCreateDataWithLength(unsigned length
) /*FOLD00*/
70 aData
= WMCreateDataWithCapacity(length
);
72 memset(aData
->bytes
, 0, length
);
73 aData
->length
= length
;
81 WMCreateDataWithBytes(void *bytes
, unsigned length
) /*FOLD00*/
85 aData
= WMCreateDataWithCapacity(length
);
86 aData
->length
= length
;
87 memcpy(aData
->bytes
, bytes
, length
);
94 WMCreateDataWithBytesNoCopy(void *bytes
, unsigned length
, /*FOLD00*/
95 WMFreeDataProc
*destructor
)
99 aData
= (WMData
*)wmalloc(sizeof(WMData
));
100 aData
->length
= length
;
101 aData
->capacity
= length
;
102 aData
->growth
= length
/2 > 0 ? length
/2 : 1;
103 aData
->bytes
= bytes
;
104 aData
->retainCount
= 1;
106 aData
->destructor
= destructor
;
113 WMCreateDataWithData(WMData
*aData
) /*FOLD00*/
117 if (aData
->length
> 0) {
118 newData
= WMCreateDataWithBytes(aData
->bytes
, aData
->length
);
120 newData
= WMCreateDataWithCapacity(0);
122 newData
->format
= aData
->format
;
129 WMRetainData(WMData
*aData
) /*FOLD00*/
131 aData
->retainCount
++;
137 WMReleaseData(WMData
*aData
) /*FOLD00*/
139 aData
->retainCount
--;
140 if (aData
->retainCount
> 0)
142 if (aData
->bytes
!=NULL
&& aData
->destructor
!=NULL
) {
143 aData
->destructor(aData
->bytes
);
150 /* Adjusting capacity */
153 WMSetDataCapacity(WMData
*aData
, unsigned capacity
) /*FOLD00*/
155 if (aData
->capacity
!= capacity
) {
156 aData
->bytes
= wrealloc(aData
->bytes
, capacity
);
157 aData
->capacity
= capacity
;
158 aData
->growth
= capacity
/2 > 0 ? capacity
/2 : 1;
160 if (aData
->length
> capacity
) {
161 aData
->length
= capacity
;
167 WMSetDataLength(WMData
*aData
, unsigned length
) /*FOLD00*/
169 if (length
> aData
->capacity
) {
170 WMSetDataCapacity(aData
, length
);
172 if (length
> aData
->length
) {
173 unsigned char *dataBytes
= (unsigned char *)aData
->bytes
;
175 memset(dataBytes
+ aData
->length
, 0, length
- aData
->length
);
177 aData
->length
= length
;
182 WMSetDataFormat(WMData
*aData
, unsigned format
)
184 aData
->format
= format
;
189 WMIncreaseDataLengthBy(WMData
*aData
, unsigned extraLength
) /*FOLD00*/
191 WMSetDataLength(aData
, aData
->length
+ extraLength
);
198 WMDataBytes(WMData
*aData
) /*FOLD00*/
205 WMGetDataBytes(WMData
*aData
, void *buffer
) /*FOLD00*/
207 wassertr(aData
->length
> 0);
209 memcpy(buffer
, aData
->bytes
, aData
->length
);
214 WMGetDataFormat(WMData
*aData
)
216 return aData
->format
;
221 WMGetDataBytesWithLength(WMData
*aData
, void *buffer
, unsigned length
) /*FOLD00*/
223 wassertr(aData
->length
> 0);
224 wassertr(length
<= aData
->length
);
226 memcpy(buffer
, aData
->bytes
, length
);
231 WMGetDataBytesWithRange(WMData
*aData
, void *buffer
, WMRange aRange
) /*FOLD00*/
233 unsigned char *dataBytes
= (unsigned char *)aData
->bytes
;
235 wassertr(aRange
.position
< aData
->length
);
236 wassertr(aRange
.count
<= aData
->length
-aRange
.position
);
238 memcpy(buffer
,dataBytes
+ aRange
.position
, aRange
.count
);
243 WMGetSubdataWithRange(WMData
*aData
, WMRange aRange
) /*FOLD00*/
248 /* return an empty subdata instead if aRange.count is 0 ? */
249 wassertrv(aRange
.count
> 0, NULL
);
251 buffer
= wmalloc(aRange
.count
);
252 WMGetDataBytesWithRange(aData
, buffer
, aRange
);
253 newData
= WMCreateDataWithBytesNoCopy(buffer
, aRange
.count
, wfree
);
254 newData
->format
= aData
->format
;
263 WMIsDataEqualToData(WMData
*aData
, WMData
*anotherData
) /*FOLD00*/
265 if (aData
->length
!= anotherData
->length
)
267 else if (!aData
->bytes
&& !anotherData
->bytes
) /* both are empty */
269 else if (!aData
->bytes
|| !anotherData
->bytes
) /* one of them is empty */
271 return (memcmp(aData
->bytes
, anotherData
->bytes
, aData
->length
)==0);
276 WMGetDataLength(WMData
*aData
) /*FOLD00*/
278 return aData
->length
;
284 WMAppendDataBytes(WMData
*aData
, void *bytes
, unsigned length
) /*FOLD00*/
286 unsigned oldLength
= aData
->length
;
287 unsigned newLength
= oldLength
+ length
;
288 unsigned char *dataBytes
= (unsigned char *)aData
->bytes
;
290 if (newLength
> aData
->capacity
) {
291 unsigned nextCapacity
= aData
->capacity
+ aData
->growth
;
292 unsigned nextGrowth
= aData
->capacity
? aData
->capacity
: 1;
294 while (nextCapacity
< newLength
) {
295 unsigned tmp
= nextCapacity
+ nextGrowth
;
297 nextGrowth
= nextCapacity
;
300 WMSetDataCapacity(aData
, nextCapacity
);
301 aData
->growth
= nextGrowth
;
303 memcpy(dataBytes
+ oldLength
, bytes
, length
);
304 aData
->length
= newLength
;
309 WMAppendData(WMData
*aData
, WMData
*anotherData
) /*FOLD00*/
311 if (anotherData
->length
> 0)
312 WMAppendDataBytes(aData
, anotherData
->bytes
, anotherData
->length
);
320 WMReplaceDataBytesInRange(WMData
*aData
, WMRange aRange
, void *bytes
) /*FOLD00*/
322 unsigned char *dataBytes
= (unsigned char *)aData
->bytes
;
324 wassertr(aRange
.position
< aData
->length
);
325 wassertr(aRange
.count
<= aData
->length
-aRange
.position
);
327 memcpy(dataBytes
+ aRange
.position
, bytes
, aRange
.count
);
332 WMResetDataBytesInRange(WMData
*aData
, WMRange aRange
) /*FOLD00*/
334 unsigned char *dataBytes
= (unsigned char *)aData
->bytes
;
336 wassertr(aRange
.position
< aData
->length
);
337 wassertr(aRange
.count
<= aData
->length
-aRange
.position
);
339 memset(dataBytes
+ aRange
.position
, 0, aRange
.count
);
344 WMSetData(WMData
*aData
, WMData
*anotherData
) /*FOLD00*/
346 unsigned length
= anotherData
->length
;
348 WMSetDataCapacity(aData
, length
);
350 memcpy(aData
->bytes
, anotherData
->bytes
, length
);
351 aData
->length
= length
;