1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * ***** BEGIN LICENSE BLOCK *****
4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 *
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is Mozilla Communicator client code, released
17 * March 31, 1998.
18 *
19 * The Initial Developer of the Original Code is
20 * Netscape Communications Corporation.
21 * Portions created by the Initial Developer are Copyright (C) 1998
22 * the Initial Developer. All Rights Reserved.
23 *
24 * Contributor(s):
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
37 *
38 * ***** END LICENSE BLOCK ***** */
39 #include "jsstddef.h"
40 #include "jsconfig.h"
42 #if JS_HAS_XDR
44 #include <string.h>
45 #include "jstypes.h"
46 #include "jsutil.h" /* Added by JSIFY */
47 #include "jsdhash.h"
48 #include "jsprf.h"
49 #include "jsapi.h"
50 #include "jscntxt.h"
51 #include "jsobj.h" /* js_XDRObject */
52 #include "jsscript.h" /* js_XDRScript */
53 #include "jsstr.h"
54 #include "jsxdrapi.h"
56 #ifdef DEBUG
57 #define DBG(x) x
58 #else
59 #define DBG(x) ((void)0)
60 #endif
62 typedef struct JSXDRMemState {
63 JSXDRState state;
64 char *base;
65 uint32 count;
66 uint32 limit;
67 } JSXDRMemState;
69 #define MEM_BLOCK 8192
70 #define MEM_PRIV(xdr) ((JSXDRMemState *)(xdr))
72 #define MEM_BASE(xdr) (MEM_PRIV(xdr)->base)
73 #define MEM_COUNT(xdr) (MEM_PRIV(xdr)->count)
74 #define MEM_LIMIT(xdr) (MEM_PRIV(xdr)->limit)
76 #define MEM_LEFT(xdr, bytes) \
77 JS_BEGIN_MACRO \
78 if ((xdr)->mode == JSXDR_DECODE && \
79 MEM_COUNT(xdr) + bytes > MEM_LIMIT(xdr)) { \
80 JS_ReportErrorNumber((xdr)->cx, js_GetErrorMessage, NULL, \
81 JSMSG_END_OF_DATA); \
82 return 0; \
83 } \
84 JS_END_MACRO
86 #define MEM_NEED(xdr, bytes) \
87 JS_BEGIN_MACRO \
88 if ((xdr)->mode == JSXDR_ENCODE) { \
89 if (MEM_LIMIT(xdr) && \
90 MEM_COUNT(xdr) + bytes > MEM_LIMIT(xdr)) { \
91 uint32 limit_ = JS_ROUNDUP(MEM_COUNT(xdr) + bytes, MEM_BLOCK);\
92 void *data_ = JS_realloc((xdr)->cx, MEM_BASE(xdr), limit_); \
93 if (!data_) \
94 return 0; \
95 MEM_BASE(xdr) = data_; \
96 MEM_LIMIT(xdr) = limit_; \
97 } \
98 } else { \
99 MEM_LEFT(xdr, bytes); \
100 } \
101 JS_END_MACRO
103 #define MEM_DATA(xdr) ((void *)(MEM_BASE(xdr) + MEM_COUNT(xdr)))
104 #define MEM_INCR(xdr,bytes) (MEM_COUNT(xdr) += (bytes))
106 static JSBool
107 mem_get32(JSXDRState *xdr, uint32 *lp)
108 {
109 MEM_LEFT(xdr, 4);
110 *lp = *(uint32 *)MEM_DATA(xdr);
111 MEM_INCR(xdr, 4);
112 return JS_TRUE;
113 }
115 static JSBool
116 mem_set32(JSXDRState *xdr, uint32 *lp)
117 {
118 MEM_NEED(xdr, 4);
119 *(uint32 *)MEM_DATA(xdr) = *lp;
120 MEM_INCR(xdr, 4);
121 return JS_TRUE;
122 }
124 static JSBool
125 mem_getbytes(JSXDRState *xdr, char *bytes, uint32 len)
126 {
127 MEM_LEFT(xdr, len);
128 memcpy(bytes, MEM_DATA(xdr), len);
129 MEM_INCR(xdr, len);
130 return JS_TRUE;
131 }
133 static JSBool
134 mem_setbytes(JSXDRState *xdr, char *bytes, uint32 len)
135 {
136 MEM_NEED(xdr, len);
137 memcpy(MEM_DATA(xdr), bytes, len);
138 MEM_INCR(xdr, len);
139 return JS_TRUE;
140 }
142 static void *
143 mem_raw(JSXDRState *xdr, uint32 len)
144 {
145 void *data;
146 if (xdr->mode == JSXDR_ENCODE) {
147 MEM_NEED(xdr, len);
148 } else if (xdr->mode == JSXDR_DECODE) {
149 MEM_LEFT(xdr, len);
150 }
151 data = MEM_DATA(xdr);
152 MEM_INCR(xdr, len);
153 return data;
154 }
156 static JSBool
157 mem_seek(JSXDRState *xdr, int32 offset, JSXDRWhence whence)
158 {
159 switch (whence) {
160 case JSXDR_SEEK_CUR:
161 if ((int32)MEM_COUNT(xdr) + offset < 0) {
162 JS_ReportErrorNumber(xdr->cx, js_GetErrorMessage, NULL,
163 JSMSG_SEEK_BEYOND_START);
164 return JS_FALSE;
165 }
166 if (offset > 0)
167 MEM_NEED(xdr, offset);
168 MEM_COUNT(xdr) += offset;
169 return JS_TRUE;
170 case JSXDR_SEEK_SET:
171 if (offset < 0) {
172 JS_ReportErrorNumber(xdr->cx, js_GetErrorMessage, NULL,
173 JSMSG_SEEK_BEYOND_START);
174 return JS_FALSE;
175 }
176 if (xdr->mode == JSXDR_ENCODE) {
177 if ((uint32)offset > MEM_COUNT(xdr))
178 MEM_NEED(xdr, offset - MEM_COUNT(xdr));
179 MEM_COUNT(xdr) = offset;
180 } else {
181 if ((uint32)offset > MEM_LIMIT(xdr)) {
182 JS_ReportErrorNumber(xdr->cx, js_GetErrorMessage, NULL,
183 JSMSG_SEEK_BEYOND_END);
184 return JS_FALSE;
185 }
186 MEM_COUNT(xdr) = offset;
187 }
188 return JS_TRUE;
189 case JSXDR_SEEK_END:
190 if (offset >= 0 ||
191 xdr->mode == JSXDR_ENCODE ||
192 (int32)MEM_LIMIT(xdr) + offset < 0) {
193 JS_ReportErrorNumber(xdr->cx, js_GetErrorMessage, NULL,
194 JSMSG_END_SEEK);
195 return JS_FALSE;
196 }
197 MEM_COUNT(xdr) = MEM_LIMIT(xdr) + offset;
198 return JS_TRUE;
199 default: {
200 char numBuf[12];
201 JS_snprintf(numBuf, sizeof numBuf, "%d", whence);
202 JS_ReportErrorNumber(xdr->cx, js_GetErrorMessage, NULL,
203 JSMSG_WHITHER_WHENCE, numBuf);
204 return JS_FALSE;
205 }
206 }
207 }
209 static uint32
210 mem_tell(JSXDRState *xdr)
211 {
212 return MEM_COUNT(xdr);
213 }
215 static void
216 mem_finalize(JSXDRState *xdr)
217 {
218 JS_free(xdr->cx, MEM_BASE(xdr));
219 }
221 static JSXDROps xdrmem_ops = {
222 mem_get32, mem_set32, mem_getbytes, mem_setbytes,
223 mem_raw, mem_seek, mem_tell, mem_finalize
224 };
226 JS_PUBLIC_API(void)
227 JS_XDRInitBase(JSXDRState *xdr, JSXDRMode mode, JSContext *cx)
228 {
229 xdr->mode = mode;
230 xdr->cx = cx;
231 xdr->registry = NULL;
232 xdr->numclasses = xdr->maxclasses = 0;
233 xdr->reghash = NULL;
234 xdr->userdata = NULL;
235 }
237 JS_PUBLIC_API(JSXDRState *)
238 JS_XDRNewMem(JSContext *cx, JSXDRMode mode)
239 {
240 JSXDRState *xdr = (JSXDRState *) JS_malloc(cx, sizeof(JSXDRMemState));
241 if (!xdr)
242 return NULL;
243 JS_XDRInitBase(xdr, mode, cx);
244 if (mode == JSXDR_ENCODE) {
245 if (!(MEM_BASE(xdr) = JS_malloc(cx, MEM_BLOCK))) {
246 JS_free(cx, xdr);
247 return NULL;
248 }
249 } else {
250 /* XXXbe ok, so better not deref MEM_BASE(xdr) if not ENCODE */
251 MEM_BASE(xdr) = NULL;
252 }
253 xdr->ops = &xdrmem_ops;
254 MEM_COUNT(xdr) = 0;
255 MEM_LIMIT(xdr) = MEM_BLOCK;
256 return xdr;
257 }
259 JS_PUBLIC_API(void *)
260 JS_XDRMemGetData(JSXDRState *xdr, uint32 *lp)
261 {
262 if (xdr->ops != &xdrmem_ops)
263 return NULL;
264 *lp = MEM_COUNT(xdr);
265 return MEM_BASE(xdr);
266 }
268 JS_PUBLIC_API(void)
269 JS_XDRMemSetData(JSXDRState *xdr, void *data, uint32 len)
270 {
271 if (xdr->ops != &xdrmem_ops)
272 return;
273 MEM_LIMIT(xdr) = len;
274 MEM_BASE(xdr) = data;
275 MEM_COUNT(xdr) = 0;
276 }
278 JS_PUBLIC_API(uint32)
279 JS_XDRMemDataLeft(JSXDRState *xdr)
280 {
281 if (xdr->ops != &xdrmem_ops)
282 return 0;
283 return MEM_LIMIT(xdr) - MEM_COUNT(xdr);
284 }
286 JS_PUBLIC_API(void)
287 JS_XDRMemResetData(JSXDRState *xdr)
288 {
289 if (xdr->ops != &xdrmem_ops)
290 return;
291 MEM_COUNT(xdr) = 0;
292 }
294 JS_PUBLIC_API(void)
295 JS_XDRDestroy(JSXDRState *xdr)
296 {
297 JSContext *cx = xdr->cx;
298 xdr->ops->finalize(xdr);
299 if (xdr->registry) {
300 JS_free(cx, xdr->registry);
301 if (xdr->reghash)
302 JS_DHashTableDestroy(xdr->reghash);
303 }
304 JS_free(cx, xdr);
305 }
307 JS_PUBLIC_API(JSBool)
308 JS_XDRUint8(JSXDRState *xdr, uint8 *b)
309 {
310 uint32 l = *b;
311 if (!JS_XDRUint32(xdr, &l))
312 return JS_FALSE;
313 *b = (uint8) l;
314 return JS_TRUE;
315 }
317 JS_PUBLIC_API(JSBool)
318 JS_XDRUint16(JSXDRState *xdr, uint16 *s)
319 {
320 uint32 l = *s;
321 if (!JS_XDRUint32(xdr, &l))
322 return JS_FALSE;
323 *s = (uint16) l;
324 return JS_TRUE;
325 }
327 JS_PUBLIC_API(JSBool)
328 JS_XDRUint32(JSXDRState *xdr, uint32 *lp)
329 {
330 JSBool ok = JS_TRUE;
331 if (xdr->mode == JSXDR_ENCODE) {
332 uint32 xl = JSXDR_SWAB32(*lp);
333 ok = xdr->ops->set32(xdr, &xl);
334 } else if (xdr->mode == JSXDR_DECODE) {
335 ok = xdr->ops->get32(xdr, lp);
336 *lp = JSXDR_SWAB32(*lp);
337 }
338 return ok;
339 }
341 JS_PUBLIC_API(JSBool)
342 JS_XDRBytes(JSXDRState *xdr, char *bytes, uint32 len)
343 {
344 uint32 padlen;
345 static char padbuf[JSXDR_ALIGN-1];
347 if (xdr->mode == JSXDR_ENCODE) {
348 if (!xdr->ops->setbytes(xdr, bytes, len))
349 return JS_FALSE;
350 } else {
351 if (!xdr->ops->getbytes(xdr, bytes, len))
352 return JS_FALSE;
353 }
354 len = xdr->ops->tell(xdr);
355 if (len % JSXDR_ALIGN) {
356 padlen = JSXDR_ALIGN - (len % JSXDR_ALIGN);
357 if (xdr->mode == JSXDR_ENCODE) {
358 if (!xdr->ops->setbytes(xdr, padbuf, padlen))
359 return JS_FALSE;
360 } else {
361 if (!xdr->ops->seek(xdr, padlen, JSXDR_SEEK_CUR))
362 return JS_FALSE;
363 }
364 }
365 return JS_TRUE;
366 }
368 /**
369 * Convert between a C string and the XDR representation:
370 * leading 32-bit count, then counted vector of chars,
371 * then possibly \0 padding to multiple of 4.
372 */
373 JS_PUBLIC_API(JSBool)
374 JS_XDRCString(JSXDRState *xdr, char **sp)
375 {
376 uint32 len;
378 if (xdr->mode == JSXDR_ENCODE)
379 len = strlen(*sp);
380 JS_XDRUint32(xdr, &len);
381 if (xdr->mode == JSXDR_DECODE) {
382 if (!(*sp = (char *) JS_malloc(xdr->cx, len + 1)))
383 return JS_FALSE;
384 }
385 if (!JS_XDRBytes(xdr, *sp, len)) {
386 if (xdr->mode == JSXDR_DECODE)
387 JS_free(xdr->cx, *sp);
388 return JS_FALSE;
389 }
390 if (xdr->mode == JSXDR_DECODE) {
391 (*sp)[len] = '\0';
392 } else if (xdr->mode == JSXDR_FREE) {
393 JS_free(xdr->cx, *sp);
394 *sp = NULL;
395 }
396 return JS_TRUE;
397 }
399 JS_PUBLIC_API(JSBool)
400 JS_XDRCStringOrNull(JSXDRState *xdr, char **sp)
401 {
402 uint32 null = (*sp == NULL);
403 if (!JS_XDRUint32(xdr, &null))
404 return JS_FALSE;
405 if (null) {
406 *sp = NULL;
407 return JS_TRUE;
408 }
409 return JS_XDRCString(xdr, sp);
410 }
412 /*
413 * Convert between a JS (Unicode) string and the XDR representation.
414 */
415 JS_PUBLIC_API(JSBool)
416 JS_XDRString(JSXDRState *xdr, JSString **strp)
417 {
418 uint32 i, len, padlen, nbytes;
419 jschar *chars = NULL, *raw;
421 if (xdr->mode == JSXDR_ENCODE)
422 len = JSSTRING_LENGTH(*strp);
423 if (!JS_XDRUint32(xdr, &len))
424 return JS_FALSE;
425 nbytes = len * sizeof(jschar);
427 if (xdr->mode == JSXDR_DECODE) {
428 if (!(chars = (jschar *) JS_malloc(xdr->cx, nbytes + sizeof(jschar))))
429 return JS_FALSE;
430 } else {
431 chars = JSSTRING_CHARS(*strp);
432 }
434 padlen = nbytes % JSXDR_ALIGN;
435 if (padlen) {
436 padlen = JSXDR_ALIGN - padlen;
437 nbytes += padlen;
438 }
439 if (!(raw = (jschar *) xdr->ops->raw(xdr, nbytes)))
440 goto bad;
441 if (xdr->mode == JSXDR_ENCODE) {
442 for (i = 0; i < len; i++)
443 raw[i] = JSXDR_SWAB16(chars[i]);
444 if (padlen)
445 memset((char *)raw + nbytes - padlen, 0, padlen);
446 } else if (xdr->mode == JSXDR_DECODE) {
447 for (i = 0; i < len; i++)
448 chars[i] = JSXDR_SWAB16(raw[i]);
449 chars[len] = 0;
451 if (!(*strp = JS_NewUCString(xdr->cx, chars, len)))
452 goto bad;
453 }
454 return JS_TRUE;
456 bad:
457 if (xdr->mode == JSXDR_DECODE)
458 JS_free(xdr->cx, chars);
459 return JS_FALSE;
460 }
462 JS_PUBLIC_API(JSBool)
463 JS_XDRStringOrNull(JSXDRState *xdr, JSString **strp)
464 {
465 uint32 null = (*strp == NULL);
466 if (!JS_XDRUint32(xdr, &null))
467 return JS_FALSE;
468 if (null) {
469 *strp = NULL;
470 return JS_TRUE;
471 }
472 return JS_XDRString(xdr, strp);
473 }
475 JS_PUBLIC_API(JSBool)
476 JS_XDRDouble(JSXDRState *xdr, jsdouble **dp)
477 {
478 jsdouble d;
479 if (xdr->mode == JSXDR_ENCODE)
480 d = **dp;
481 #if IS_BIG_ENDIAN
482 if (!JS_XDRUint32(xdr, (uint32 *)&d + 1) ||
483 !JS_XDRUint32(xdr, (uint32 *)&d))
484 #else
485 if (!JS_XDRUint32(xdr, (uint32 *)&d) ||
486 !JS_XDRUint32(xdr, (uint32 *)&d + 1))
487 #endif
488 return JS_FALSE;
489 if (xdr->mode == JSXDR_DECODE) {
490 *dp = JS_NewDouble(xdr->cx, d);
491 if (!*dp)
492 return JS_FALSE;
493 }
494 return JS_TRUE;
495 }
497 /* These are magic pseudo-tags: see jsapi.h, near the top, for real tags. */
498 #define JSVAL_XDRNULL 0x8
499 #define JSVAL_XDRVOID 0xA
501 JS_PUBLIC_API(JSBool)
502 JS_XDRValue(JSXDRState *xdr, jsval *vp)
503 {
504 uint32 type;
506 if (xdr->mode == JSXDR_ENCODE) {
507 if (JSVAL_IS_NULL(*vp))
508 type = JSVAL_XDRNULL;
509 else if (JSVAL_IS_VOID(*vp))
510 type = JSVAL_XDRVOID;
511 else
512 type = JSVAL_TAG(*vp);
513 }
514 if (!JS_XDRUint32(xdr, &type))
515 return JS_FALSE;
517 switch (type) {
518 case JSVAL_XDRNULL:
519 *vp = JSVAL_NULL;
520 break;
521 case JSVAL_XDRVOID:
522 *vp = JSVAL_VOID;
523 break;
524 case JSVAL_STRING: {
525 JSString *str;
526 if (xdr->mode == JSXDR_ENCODE)
527 str = JSVAL_TO_STRING(*vp);
528 if (!JS_XDRString(xdr, &str))
529 return JS_FALSE;
530 if (xdr->mode == JSXDR_DECODE)
531 *vp = STRING_TO_JSVAL(str);
532 break;
533 }
534 case JSVAL_DOUBLE: {
535 jsdouble *dp;
536 if (xdr->mode == JSXDR_ENCODE)
537 dp = JSVAL_TO_DOUBLE(*vp);
538 if (!JS_XDRDouble(xdr, &dp))
539 return JS_FALSE;
540 if (xdr->mode == JSXDR_DECODE)
541 *vp = DOUBLE_TO_JSVAL(dp);
542 break;
543 }
544 case JSVAL_OBJECT: {
545 JSObject *obj;
546 if (xdr->mode == JSXDR_ENCODE)
547 obj = JSVAL_TO_OBJECT(*vp);
548 if (!js_XDRObject(xdr, &obj))
549 return JS_FALSE;
550 if (xdr->mode == JSXDR_DECODE)
551 *vp = OBJECT_TO_JSVAL(obj);
552 break;
553 }
554 case JSVAL_BOOLEAN: {
555 uint32 b;
556 if (xdr->mode == JSXDR_ENCODE)
557 b = (uint32) JSVAL_TO_BOOLEAN(*vp);
558 if (!JS_XDRUint32(xdr, &b))
559 return JS_FALSE;
560 if (xdr->mode == JSXDR_DECODE)
561 *vp = BOOLEAN_TO_JSVAL((JSBool) b);
562 break;
563 }
564 default: {
565 uint32 i;
567 JS_ASSERT(type & JSVAL_INT);
568 if (xdr->mode == JSXDR_ENCODE)
569 i = (uint32) JSVAL_TO_INT(*vp);
570 if (!JS_XDRUint32(xdr, &i))
571 return JS_FALSE;
572 if (xdr->mode == JSXDR_DECODE)
573 *vp = INT_TO_JSVAL((int32) i);
574 break;
575 }
576 }
577 return JS_TRUE;
578 }
580 JS_PUBLIC_API(JSBool)
581 JS_XDRScript(JSXDRState *xdr, JSScript **scriptp)
582 {
583 if (!js_XDRScript(xdr, scriptp, NULL))
584 return JS_FALSE;
585 if (xdr->mode == JSXDR_DECODE)
586 js_CallNewScriptHook(xdr->cx, *scriptp, NULL);
587 return JS_TRUE;
588 }
590 #define CLASS_REGISTRY_MIN 8
591 #define CLASS_INDEX_TO_ID(i) ((i)+1)
592 #define CLASS_ID_TO_INDEX(id) ((id)-1)
594 typedef struct JSRegHashEntry {
595 JSDHashEntryHdr hdr;
596 const char *name;
597 uint32 index;
598 } JSRegHashEntry;
600 JS_PUBLIC_API(JSBool)
601 JS_XDRRegisterClass(JSXDRState *xdr, JSClass *clasp, uint32 *idp)
602 {
603 uintN numclasses, maxclasses;
604 JSClass **registry;
606 numclasses = xdr->numclasses;
607 maxclasses = xdr->maxclasses;
608 if (numclasses == maxclasses) {
609 maxclasses = (maxclasses == 0) ? CLASS_REGISTRY_MIN : maxclasses << 1;
610 registry = (JSClass **)
611 JS_realloc(xdr->cx, xdr->registry, maxclasses * sizeof(JSClass *));
612 if (!registry)
613 return JS_FALSE;
614 xdr->registry = registry;
615 xdr->maxclasses = maxclasses;
616 } else {
617 JS_ASSERT(numclasses && numclasses < maxclasses);
618 registry = xdr->registry;
619 }
621 registry[numclasses] = clasp;
622 if (xdr->reghash) {
623 JSRegHashEntry *entry = (JSRegHashEntry *)
624 JS_DHashTableOperate(xdr->reghash, clasp->name, JS_DHASH_ADD);
625 if (!entry) {
626 JS_ReportOutOfMemory(xdr->cx);
627 return JS_FALSE;
628 }
629 entry->name = clasp->name;
630 entry->index = numclasses;
631 }
632 *idp = CLASS_INDEX_TO_ID(numclasses);
633 xdr->numclasses = ++numclasses;
634 return JS_TRUE;
635 }
637 JS_PUBLIC_API(uint32)
638 JS_XDRFindClassIdByName(JSXDRState *xdr, const char *name)
639 {
640 uintN i, numclasses;
642 numclasses = xdr->numclasses;
643 if (numclasses >= 10) {
644 JSRegHashEntry *entry;
646 /* Bootstrap reghash from registry on first overpopulated Find. */
647 if (!xdr->reghash) {
648 xdr->reghash = JS_NewDHashTable(JS_DHashGetStubOps(), NULL,
649 sizeof(JSRegHashEntry),
650 numclasses);
651 if (xdr->reghash) {
652 for (i = 0; i < numclasses; i++) {
653 JSClass *clasp = xdr->registry[i];
654 entry = (JSRegHashEntry *)
655 JS_DHashTableOperate(xdr->reghash, clasp->name,
656 JS_DHASH_ADD);
657 entry->name = clasp->name;
658 entry->index = i;
659 }
660 }
661 }
663 /* If we managed to create reghash, use it for O(1) Find. */
664 if (xdr->reghash) {
665 entry = (JSRegHashEntry *)
666 JS_DHashTableOperate(xdr->reghash, name, JS_DHASH_LOOKUP);
667 if (JS_DHASH_ENTRY_IS_BUSY(&entry->hdr))
668 return CLASS_INDEX_TO_ID(entry->index);
669 }
670 }
672 /* Only a few classes, or we couldn't malloc reghash: use linear search. */
673 for (i = 0; i < numclasses; i++) {
674 if (!strcmp(name, xdr->registry[i]->name))
675 return CLASS_INDEX_TO_ID(i);
676 }
677 return 0;
678 }
680 JS_PUBLIC_API(JSClass *)
681 JS_XDRFindClassById(JSXDRState *xdr, uint32 id)
682 {
683 uintN i = CLASS_ID_TO_INDEX(id);
685 if (i >= xdr->numclasses)
686 return NULL;
687 return xdr->registry[i];
688 }
690 #endif /* JS_HAS_XDR */