Ticket #3564: rtmppkt.c

File rtmppkt.c, 20.2 KB (added by K.Y.H, 12 years ago)
Line 
1/*
2 * RTMP input format
3 * Copyright (c) 2009 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "libavcodec/bytestream.h"
23#include "libavutil/avstring.h"
24#include "libavutil/intfloat.h"
25#include "avformat.h"
26
27#include "rtmppkt.h"
28#include "flv.h"
29#include "url.h"
30
31void ff_amf_write_bool(uint8_t **dst, int val)
32{
33 bytestream_put_byte(dst, AMF_DATA_TYPE_BOOL);
34 bytestream_put_byte(dst, val);
35}
36
37void ff_amf_write_number(uint8_t **dst, double val)
38{
39 bytestream_put_byte(dst, AMF_DATA_TYPE_NUMBER);
40 bytestream_put_be64(dst, av_double2int(val));
41}
42
43void ff_amf_write_string(uint8_t **dst, const char *str)
44{
45 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
46 bytestream_put_be16(dst, strlen(str));
47 bytestream_put_buffer(dst, str, strlen(str));
48}
49
50void ff_amf_write_string2(uint8_t **dst, const char *str1, const char *str2)
51{
52 int len1 = 0, len2 = 0;
53 if (str1)
54 len1 = strlen(str1);
55 if (str2)
56 len2 = strlen(str2);
57 bytestream_put_byte(dst, AMF_DATA_TYPE_STRING);
58 bytestream_put_be16(dst, len1 + len2);
59 bytestream_put_buffer(dst, str1, len1);
60 bytestream_put_buffer(dst, str2, len2);
61}
62
63void ff_amf_write_null(uint8_t **dst)
64{
65 bytestream_put_byte(dst, AMF_DATA_TYPE_NULL);
66}
67
68void ff_amf_write_object_start(uint8_t **dst)
69{
70 bytestream_put_byte(dst, AMF_DATA_TYPE_OBJECT);
71}
72
73void ff_amf_write_field_name(uint8_t **dst, const char *str)
74{
75 bytestream_put_be16(dst, strlen(str));
76 bytestream_put_buffer(dst, str, strlen(str));
77}
78
79void ff_amf_write_object_end(uint8_t **dst)
80{
81 /* first two bytes are field name length = 0,
82 * AMF object should end with it and end marker
83 */
84 bytestream_put_be24(dst, AMF_DATA_TYPE_OBJECT_END);
85}
86
87int ff_amf_read_bool(GetByteContext *bc, int *val)
88{
89 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_BOOL)
90 return AVERROR_INVALIDDATA;
91 *val = bytestream2_get_byte(bc);
92 return 0;
93}
94
95int ff_amf_read_number(GetByteContext *bc, double *val)
96{
97 uint64_t read;
98 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NUMBER)
99 return AVERROR_INVALIDDATA;
100 read = bytestream2_get_be64(bc);
101 *val = av_int2double(read);
102 return 0;
103}
104
105int ff_amf_read_string(GetByteContext *bc, uint8_t *str,
106 int strsize, int *length)
107{
108 int stringlen = 0;
109 int readsize;
110 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_STRING)
111 return AVERROR_INVALIDDATA;
112 stringlen = bytestream2_get_be16(bc);
113 if (stringlen + 1 > strsize)
114 return AVERROR(EINVAL);
115 readsize = bytestream2_get_buffer(bc, str, stringlen);
116 if (readsize != stringlen) {
117 av_log(NULL, AV_LOG_WARNING,
118 "Unable to read as many bytes as AMF string signaled\n");
119 }
120 str[readsize] = '\0';
121 *length = FFMIN(stringlen, readsize);
122 return 0;
123}
124
125int ff_amf_read_null(GetByteContext *bc)
126{
127 if (bytestream2_get_byte(bc) != AMF_DATA_TYPE_NULL)
128 return AVERROR_INVALIDDATA;
129 return 0;
130}
131
132int ff_rtmp_check_alloc_array(RTMPPacket **prev_pkt, int *nb_prev_pkt,
133 int channel)
134{
135 int nb_alloc;
136 RTMPPacket *ptr;
137 if (channel < *nb_prev_pkt)
138 return 0;
139
140 nb_alloc = channel + 16;
141 // This can't use the av_reallocp family of functions, since we
142 // would need to free each element in the array before the array
143 // itself is freed.
144 ptr = av_realloc_array(*prev_pkt, nb_alloc, sizeof(**prev_pkt));
145 if (!ptr)
146 return AVERROR(ENOMEM);
147 memset(ptr + *nb_prev_pkt, 0, (nb_alloc - *nb_prev_pkt) * sizeof(*ptr));
148 *prev_pkt = ptr;
149 *nb_prev_pkt = nb_alloc;
150 return 0;
151}
152
153int ff_rtmp_packet_read(URLContext *h, RTMPPacket *p,
154 int chunk_size, RTMPPacket **prev_pkt, int *nb_prev_pkt)
155{
156 uint8_t hdr;
157
158 if (ffurl_read(h, &hdr, 1) != 1)
159 return AVERROR(EIO);
160
161 return ff_rtmp_packet_read_internal(h, p, chunk_size, prev_pkt,
162 nb_prev_pkt, hdr);
163}
164
165static int rtmp_packet_read_one_chunk(URLContext *h, RTMPPacket *p,
166 int chunk_size, RTMPPacket **prev_pkt_ptr,
167 int *nb_prev_pkt, uint8_t hdr)
168{
169
170 uint8_t buf[16];
171 int channel_id, timestamp, size;
172 uint32_t ts_field; // non-extended timestamp or delta field
173 uint32_t extra = 0;
174 enum RTMPPacketType type;
175 int written = 0;
176 int ret, toread;
177 RTMPPacket *prev_pkt;
178
179 written++;
180 channel_id = hdr & 0x3F;
181
182 if (channel_id < 2) { //special case for channel number >= 64
183 buf[1] = 0;
184 if (ffurl_read_complete(h, buf, channel_id + 1) != channel_id + 1)
185 return AVERROR(EIO);
186 written += channel_id + 1;
187 channel_id = AV_RL16(buf) + 64;
188 }
189 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
190 channel_id)) < 0)
191 return ret;
192 prev_pkt = *prev_pkt_ptr;
193 size = prev_pkt[channel_id].size;
194 type = prev_pkt[channel_id].type;
195 extra = prev_pkt[channel_id].extra;
196
197 hdr >>= 6; // header size indicator
198 if (hdr == RTMP_PS_ONEBYTE) {
199 ts_field = prev_pkt[channel_id].ts_field;
200 } else {
201 if (ffurl_read_complete(h, buf, 3) != 3)
202 return AVERROR(EIO);
203 written += 3;
204 ts_field = AV_RB24(buf);
205 if (hdr != RTMP_PS_FOURBYTES) {
206 if (ffurl_read_complete(h, buf, 3) != 3)
207 return AVERROR(EIO);
208 written += 3;
209 size = AV_RB24(buf);
210 if (ffurl_read_complete(h, buf, 1) != 1)
211 return AVERROR(EIO);
212 written++;
213 type = buf[0];
214 if (hdr == RTMP_PS_TWELVEBYTES) {
215 if (ffurl_read_complete(h, buf, 4) != 4)
216 return AVERROR(EIO);
217 written += 4;
218 extra = AV_RL32(buf);
219 }
220 }
221 }
222 if (ts_field == 0xFFFFFF) {
223 if (ffurl_read_complete(h, buf, 4) != 4)
224 return AVERROR(EIO);
225 timestamp = AV_RB32(buf);
226 } else {
227 timestamp = ts_field;
228 }
229 if (hdr != RTMP_PS_TWELVEBYTES)
230 timestamp += prev_pkt[channel_id].timestamp;
231
232 if (!prev_pkt[channel_id].read) {
233 if ((ret = ff_rtmp_packet_create(p, channel_id, type, timestamp,
234 size)) < 0)
235 return ret;
236 p->read = written;
237 p->offset = 0;
238 prev_pkt[channel_id].ts_field = ts_field;
239 prev_pkt[channel_id].timestamp = timestamp;
240 } else {
241 // previous packet in this channel hasn't completed reading
242 RTMPPacket *prev = &prev_pkt[channel_id];
243 p->data = prev->data;
244 p->size = prev->size;
245 p->channel_id = prev->channel_id;
246 p->type = prev->type;
247 p->ts_field = prev->ts_field;
248 p->extra = prev->extra;
249 p->offset = prev->offset;
250 p->read = prev->read + written;
251 p->timestamp = prev->timestamp;
252 prev->data = NULL;
253 }
254 p->extra = extra;
255 // save history
256 prev_pkt[channel_id].channel_id = channel_id;
257 prev_pkt[channel_id].type = type;
258 prev_pkt[channel_id].size = size;
259 prev_pkt[channel_id].extra = extra;
260 size = size - p->offset;
261
262 toread = FFMIN(size, chunk_size);
263 if (ffurl_read_complete(h, p->data + p->offset, toread) != toread) {
264 ff_rtmp_packet_destroy(p);
265 return AVERROR(EIO);
266 }
267 size -= toread;
268 p->read += toread;
269 p->offset += toread;
270
271 if (size > 0) {
272 RTMPPacket *prev = &prev_pkt[channel_id];
273 prev->data = p->data;
274 prev->read = p->read;
275 prev->offset = p->offset;
276 // added by K.Y.H for fix crash....
277 p->data = NULL;
278 return AVERROR(EAGAIN);
279 }
280
281 prev_pkt[channel_id].read = 0; // read complete; reset if needed
282 return p->read;
283}
284
285int ff_rtmp_packet_read_internal(URLContext *h, RTMPPacket *p, int chunk_size,
286 RTMPPacket **prev_pkt, int *nb_prev_pkt,
287 uint8_t hdr)
288{
289 while (1) {
290 int ret = rtmp_packet_read_one_chunk(h, p, chunk_size, prev_pkt,
291 nb_prev_pkt, hdr);
292 if (ret > 0 || ret != AVERROR(EAGAIN))
293 return ret;
294
295 if (ffurl_read(h, &hdr, 1) != 1)
296 return AVERROR(EIO);
297 }
298}
299
300int ff_rtmp_packet_write(URLContext *h, RTMPPacket *pkt,
301 int chunk_size, RTMPPacket **prev_pkt_ptr,
302 int *nb_prev_pkt)
303{
304 uint8_t pkt_hdr[16], *p = pkt_hdr;
305 int mode = RTMP_PS_TWELVEBYTES;
306 int off = 0;
307 int written = 0;
308 int ret;
309 RTMPPacket *prev_pkt;
310 int use_delta; // flag if using timestamp delta, not RTMP_PS_TWELVEBYTES
311 uint32_t timestamp; // full 32-bit timestamp or delta value
312
313 if ((ret = ff_rtmp_check_alloc_array(prev_pkt_ptr, nb_prev_pkt,
314 pkt->channel_id)) < 0)
315 return ret;
316 prev_pkt = *prev_pkt_ptr;
317
318 //if channel_id = 0, this is first presentation of prev_pkt, send full hdr.
319 use_delta = prev_pkt[pkt->channel_id].channel_id &&
320 pkt->extra == prev_pkt[pkt->channel_id].extra &&
321 pkt->timestamp >= prev_pkt[pkt->channel_id].timestamp;
322
323 timestamp = pkt->timestamp;
324 if (use_delta) {
325 timestamp -= prev_pkt[pkt->channel_id].timestamp;
326 }
327 if (timestamp >= 0xFFFFFF) {
328 pkt->ts_field = 0xFFFFFF;
329 } else {
330 pkt->ts_field = timestamp;
331 }
332
333 if (use_delta) {
334 if (pkt->type == prev_pkt[pkt->channel_id].type &&
335 pkt->size == prev_pkt[pkt->channel_id].size) {
336 mode = RTMP_PS_FOURBYTES;
337 if (pkt->ts_field == prev_pkt[pkt->channel_id].ts_field)
338 mode = RTMP_PS_ONEBYTE;
339 } else {
340 mode = RTMP_PS_EIGHTBYTES;
341 }
342 }
343
344 if (pkt->channel_id < 64) {
345 bytestream_put_byte(&p, pkt->channel_id | (mode << 6));
346 } else if (pkt->channel_id < 64 + 256) {
347 bytestream_put_byte(&p, 0 | (mode << 6));
348 bytestream_put_byte(&p, pkt->channel_id - 64);
349 } else {
350 bytestream_put_byte(&p, 1 | (mode << 6));
351 bytestream_put_le16(&p, pkt->channel_id - 64);
352 }
353 if (mode != RTMP_PS_ONEBYTE) {
354 bytestream_put_be24(&p, pkt->ts_field);
355 if (mode != RTMP_PS_FOURBYTES) {
356 bytestream_put_be24(&p, pkt->size);
357 bytestream_put_byte(&p, pkt->type);
358 if (mode == RTMP_PS_TWELVEBYTES)
359 bytestream_put_le32(&p, pkt->extra);
360 }
361 }
362 if (pkt->ts_field == 0xFFFFFF)
363 bytestream_put_be32(&p, timestamp);
364 // save history
365 prev_pkt[pkt->channel_id].channel_id = pkt->channel_id;
366 prev_pkt[pkt->channel_id].type = pkt->type;
367 prev_pkt[pkt->channel_id].size = pkt->size;
368 prev_pkt[pkt->channel_id].timestamp = pkt->timestamp;
369 prev_pkt[pkt->channel_id].ts_field = pkt->ts_field;
370 prev_pkt[pkt->channel_id].extra = pkt->extra;
371
372 if ((ret = ffurl_write(h, pkt_hdr, p - pkt_hdr)) < 0)
373 return ret;
374 written = p - pkt_hdr + pkt->size;
375 while (off < pkt->size) {
376 int towrite = FFMIN(chunk_size, pkt->size - off);
377 if ((ret = ffurl_write(h, pkt->data + off, towrite)) < 0)
378 return ret;
379 off += towrite;
380 if (off < pkt->size) {
381 uint8_t marker = 0xC0 | pkt->channel_id;
382 if ((ret = ffurl_write(h, &marker, 1)) < 0)
383 return ret;
384 written++;
385 }
386 }
387 return written;
388}
389
390int ff_rtmp_packet_create(RTMPPacket *pkt, int channel_id, RTMPPacketType type,
391 int timestamp, int size)
392{
393 if (size) {
394 pkt->data = av_malloc(size);
395 if (!pkt->data)
396 return AVERROR(ENOMEM);
397 }
398 pkt->size = size;
399 pkt->channel_id = channel_id;
400 pkt->type = type;
401 pkt->timestamp = timestamp;
402 pkt->extra = 0;
403 pkt->ts_field = 0;
404
405 return 0;
406}
407
408void ff_rtmp_packet_destroy(RTMPPacket *pkt)
409{
410 if (!pkt)
411 return;
412 av_freep(&pkt->data);
413 pkt->size = 0;
414}
415
416int ff_amf_tag_size(const uint8_t *data, const uint8_t *data_end)
417{
418 const uint8_t *base = data;
419 AMFDataType type;
420 unsigned nb = -1;
421 int parse_key = 1;
422
423 if (data >= data_end)
424 return -1;
425 switch ((type = *data++)) {
426 case AMF_DATA_TYPE_NUMBER: return 9;
427 case AMF_DATA_TYPE_BOOL: return 2;
428 case AMF_DATA_TYPE_STRING: return 3 + AV_RB16(data);
429 case AMF_DATA_TYPE_LONG_STRING: return 5 + AV_RB32(data);
430 case AMF_DATA_TYPE_NULL: return 1;
431 case AMF_DATA_TYPE_ARRAY:
432 parse_key = 0;
433 case AMF_DATA_TYPE_MIXEDARRAY:
434 nb = bytestream_get_be32(&data);
435 case AMF_DATA_TYPE_OBJECT:
436 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
437 int t;
438 if (parse_key) {
439 int size = bytestream_get_be16(&data);
440 if (!size) {
441 data++;
442 break;
443 }
444 if (size < 0 || size >= data_end - data)
445 return -1;
446 data += size;
447 }
448 t = ff_amf_tag_size(data, data_end);
449 if (t < 0 || t >= data_end - data)
450 return -1;
451 data += t;
452 }
453 return data - base;
454 case AMF_DATA_TYPE_OBJECT_END: return 1;
455 default: return -1;
456 }
457}
458
459int ff_amf_get_field_value(const uint8_t *data, const uint8_t *data_end,
460 const uint8_t *name, uint8_t *dst, int dst_size)
461{
462 int namelen = strlen(name);
463 int len;
464
465 while (*data != AMF_DATA_TYPE_OBJECT && data < data_end) {
466 len = ff_amf_tag_size(data, data_end);
467 if (len < 0)
468 len = data_end - data;
469 data += len;
470 }
471 if (data_end - data < 3)
472 return -1;
473 data++;
474 for (;;) {
475 int size = bytestream_get_be16(&data);
476 if (!size)
477 break;
478 if (size < 0 || size >= data_end - data)
479 return -1;
480 data += size;
481 if (size == namelen && !memcmp(data-size, name, namelen)) {
482 switch (*data++) {
483 case AMF_DATA_TYPE_NUMBER:
484 snprintf(dst, dst_size, "%g", av_int2double(AV_RB64(data)));
485 break;
486 case AMF_DATA_TYPE_BOOL:
487 snprintf(dst, dst_size, "%s", *data ? "true" : "false");
488 break;
489 case AMF_DATA_TYPE_STRING:
490 len = bytestream_get_be16(&data);
491 av_strlcpy(dst, data, FFMIN(len+1, dst_size));
492 break;
493 default:
494 return -1;
495 }
496 return 0;
497 }
498 len = ff_amf_tag_size(data, data_end);
499 if (len < 0 || len >= data_end - data)
500 return -1;
501 data += len;
502 }
503 return -1;
504}
505
506static const char* rtmp_packet_type(int type)
507{
508 switch (type) {
509 case RTMP_PT_CHUNK_SIZE: return "chunk size";
510 case RTMP_PT_BYTES_READ: return "bytes read";
511 case RTMP_PT_PING: return "ping";
512 case RTMP_PT_SERVER_BW: return "server bandwidth";
513 case RTMP_PT_CLIENT_BW: return "client bandwidth";
514 case RTMP_PT_AUDIO: return "audio packet";
515 case RTMP_PT_VIDEO: return "video packet";
516 case RTMP_PT_FLEX_STREAM: return "Flex shared stream";
517 case RTMP_PT_FLEX_OBJECT: return "Flex shared object";
518 case RTMP_PT_FLEX_MESSAGE: return "Flex shared message";
519 case RTMP_PT_NOTIFY: return "notification";
520 case RTMP_PT_SHARED_OBJ: return "shared object";
521 case RTMP_PT_INVOKE: return "invoke";
522 case RTMP_PT_METADATA: return "metadata";
523 default: return "unknown";
524 }
525}
526
527static void amf_tag_contents(void *ctx, const uint8_t *data,
528 const uint8_t *data_end)
529{
530 unsigned int size, nb = -1;
531 char buf[1024];
532 AMFDataType type;
533 int parse_key = 1;
534
535 if (data >= data_end)
536 return;
537 switch ((type = *data++)) {
538 case AMF_DATA_TYPE_NUMBER:
539 av_log(ctx, AV_LOG_DEBUG, " number %g\n", av_int2double(AV_RB64(data)));
540 return;
541 case AMF_DATA_TYPE_BOOL:
542 av_log(ctx, AV_LOG_DEBUG, " bool %d\n", *data);
543 return;
544 case AMF_DATA_TYPE_STRING:
545 case AMF_DATA_TYPE_LONG_STRING:
546 if (type == AMF_DATA_TYPE_STRING) {
547 size = bytestream_get_be16(&data);
548 } else {
549 size = bytestream_get_be32(&data);
550 }
551 size = FFMIN(size, sizeof(buf) - 1);
552 memcpy(buf, data, size);
553 buf[size] = 0;
554 av_log(ctx, AV_LOG_DEBUG, " string '%s'\n", buf);
555 return;
556 case AMF_DATA_TYPE_NULL:
557 av_log(ctx, AV_LOG_DEBUG, " NULL\n");
558 return;
559 case AMF_DATA_TYPE_ARRAY:
560 parse_key = 0;
561 case AMF_DATA_TYPE_MIXEDARRAY:
562 nb = bytestream_get_be32(&data);
563 case AMF_DATA_TYPE_OBJECT:
564 av_log(ctx, AV_LOG_DEBUG, " {\n");
565 while (nb-- > 0 || type != AMF_DATA_TYPE_ARRAY) {
566 int t;
567 if (parse_key) {
568 size = bytestream_get_be16(&data);
569 size = FFMIN(size, sizeof(buf) - 1);
570 if (!size) {
571 av_log(ctx, AV_LOG_DEBUG, " }\n");
572 data++;
573 break;
574 }
575 memcpy(buf, data, size);
576 buf[size] = 0;
577 if (size >= data_end - data)
578 return;
579 data += size;
580 av_log(ctx, AV_LOG_DEBUG, " %s: ", buf);
581 }
582 amf_tag_contents(ctx, data, data_end);
583 t = ff_amf_tag_size(data, data_end);
584 if (t < 0 || t >= data_end - data)
585 return;
586 data += t;
587 }
588 return;
589 case AMF_DATA_TYPE_OBJECT_END:
590 av_log(ctx, AV_LOG_DEBUG, " }\n");
591 return;
592 default:
593 return;
594 }
595}
596
597void ff_rtmp_packet_dump(void *ctx, RTMPPacket *p)
598{
599 av_log(ctx, AV_LOG_DEBUG, "RTMP packet type '%s'(%d) for channel %d, timestamp %d, extra field %d size %d\n",
600 rtmp_packet_type(p->type), p->type, p->channel_id, p->timestamp, p->extra, p->size);
601 if (p->type == RTMP_PT_INVOKE || p->type == RTMP_PT_NOTIFY) {
602 uint8_t *src = p->data, *src_end = p->data + p->size;
603 while (src < src_end) {
604 int sz;
605 amf_tag_contents(ctx, src, src_end);
606 sz = ff_amf_tag_size(src, src_end);
607 if (sz < 0)
608 break;
609 src += sz;
610 }
611 } else if (p->type == RTMP_PT_SERVER_BW){
612 av_log(ctx, AV_LOG_DEBUG, "Server BW = %d\n", AV_RB32(p->data));
613 } else if (p->type == RTMP_PT_CLIENT_BW){
614 av_log(ctx, AV_LOG_DEBUG, "Client BW = %d\n", AV_RB32(p->data));
615 } else if (p->type != RTMP_PT_AUDIO && p->type != RTMP_PT_VIDEO && p->type != RTMP_PT_METADATA) {
616 int i;
617 for (i = 0; i < p->size; i++)
618 av_log(ctx, AV_LOG_DEBUG, " %02X", p->data[i]);
619 av_log(ctx, AV_LOG_DEBUG, "\n");
620 }
621}
622
623int ff_amf_match_string(const uint8_t *data, int size, const char *str)
624{
625 int len = strlen(str);
626 int amf_len, type;
627
628 if (size < 1)
629 return 0;
630
631 type = *data++;
632
633 if (type != AMF_DATA_TYPE_LONG_STRING &&
634 type != AMF_DATA_TYPE_STRING)
635 return 0;
636
637 if (type == AMF_DATA_TYPE_LONG_STRING) {
638 if ((size -= 4 + 1) < 0)
639 return 0;
640 amf_len = bytestream_get_be32(&data);
641 } else {
642 if ((size -= 2 + 1) < 0)
643 return 0;
644 amf_len = bytestream_get_be16(&data);
645 }
646
647 if (amf_len > size)
648 return 0;
649
650 if (amf_len != len)
651 return 0;
652
653 return !memcmp(data, str, len);
654}