summaryrefslogtreecommitdiffstats
path: root/third_party/msgpack/include/msgpack/v3/parse.hpp
blob: b833f3e3b546b24ba0b7bf64c994f78bd4a7059d (plain)
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
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
//
// MessagePack for C++ deserializing routine
//
// Copyright (C) 2018 KONDO Takatoshi
//
//    Distributed under the Boost Software License, Version 1.0.
//    (See accompanying file LICENSE_1_0.txt or copy at
//    http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef MSGPACK_V3_PARSE_HPP
#define MSGPACK_V3_PARSE_HPP

#if MSGPACK_DEFAULT_API_VERSION >= 2

#include <cstddef>

#include "msgpack/parse_return.hpp"

namespace msgpack {

/// @cond
MSGPACK_API_VERSION_NAMESPACE(v3) {
/// @endcond

namespace detail {

template <typename VisitorHolder>
class context {
public:
    context()
        :m_trail(0), m_cs(MSGPACK_CS_HEADER)
    {
    }

    void init()
    {
        m_cs = MSGPACK_CS_HEADER;
        m_trail = 0;
        m_stack.clear();
        holder().visitor().init();
    }

    parse_return execute(const char* data, std::size_t len, std::size_t& off);

private:
    template <typename T>
    static uint32_t next_cs(T p)
    {
        return static_cast<uint32_t>(*p) & 0x1f;
    }

    VisitorHolder& holder() {
        return static_cast<VisitorHolder&>(*this);
    }

    template <typename T, typename StartVisitor, typename EndVisitor>
    parse_return start_aggregate(
        StartVisitor const& sv,
        EndVisitor const& ev,
        const char* load_pos,
        std::size_t& off) {
        typename value<T>::type size;
        load<T>(size, load_pos);
        if (size == 0) {
            if (!sv(size)) {
                off = m_current - m_start;
                return PARSE_STOP_VISITOR;
            }
            if (!ev()) {
                off = m_current - m_start;
                return PARSE_STOP_VISITOR;
            }
            parse_return ret = m_stack.consume(holder(), m_current);
            ++m_current;
            if (ret != PARSE_CONTINUE) {
                off = m_current - m_start;
                return ret;
            }
        }
        else {
            if (!sv(size)) {
                off = m_current - m_start;
                return PARSE_STOP_VISITOR;
            }
            parse_return ret = m_stack.push(holder(), sv.type(), static_cast<uint32_t>(size));
            ++m_current;
            if (ret != PARSE_CONTINUE) {
                off = m_current - m_start;
                return ret;
            }
        }
        m_cs = MSGPACK_CS_HEADER;
        return PARSE_CONTINUE;
    }

    parse_return after_visit_proc(bool visit_result, std::size_t& off) {
        if (!visit_result) {
            off = m_current - m_start;
            return PARSE_STOP_VISITOR;
        }
        parse_return ret = m_stack.consume(holder(), m_current);
        ++m_current;
        if (ret != PARSE_CONTINUE) {
            off = m_current - m_start;
        }
        m_cs = MSGPACK_CS_HEADER;
        return ret;
    }

    struct array_sv {
        array_sv(VisitorHolder& visitor_holder):m_visitor_holder(visitor_holder) {}
        bool operator()(uint32_t size) const {
            return m_visitor_holder.visitor().start_array(size);
        }
        msgpack_container_type type() const { return MSGPACK_CT_ARRAY_ITEM; }
    private:
        VisitorHolder& m_visitor_holder;
    };
    struct array_ev {
        array_ev(VisitorHolder& visitor_holder):m_visitor_holder(visitor_holder) {}
        bool operator()() const {
            return m_visitor_holder.visitor().end_array();
        }
    private:
        VisitorHolder& m_visitor_holder;
    };
    struct map_sv {
        map_sv(VisitorHolder& visitor_holder):m_visitor_holder(visitor_holder) {}
        bool operator()(uint32_t size) const {
            return m_visitor_holder.visitor().start_map(size);
        }
        msgpack_container_type type() const { return MSGPACK_CT_MAP_KEY; }
    private:
        VisitorHolder& m_visitor_holder;
    };
    struct map_ev {
        map_ev(VisitorHolder& visitor_holder):m_visitor_holder(visitor_holder) {}
        bool operator()() const {
            return m_visitor_holder.visitor().end_map();
        }
    private:
        VisitorHolder& m_visitor_holder;
    };

    struct unpack_stack {
        struct stack_elem {
            stack_elem(msgpack_container_type type, uint32_t rest):m_type(type), m_rest(rest) {}
            msgpack_container_type m_type;
            uint32_t m_rest;
        };
        unpack_stack() {
            m_stack.reserve(MSGPACK_EMBED_STACK_SIZE);
        }
        parse_return push(VisitorHolder& visitor_holder, msgpack_container_type type, uint32_t rest) {
            m_stack.push_back(stack_elem(type, rest));
            switch (type) {
            case MSGPACK_CT_ARRAY_ITEM:
                return visitor_holder.visitor().start_array_item() ? PARSE_CONTINUE : PARSE_STOP_VISITOR;
            case MSGPACK_CT_MAP_KEY:
                return visitor_holder.visitor().start_map_key() ? PARSE_CONTINUE : PARSE_STOP_VISITOR;
            case MSGPACK_CT_MAP_VALUE:
                assert(0);
                return PARSE_STOP_VISITOR;
            }
            assert(0);
            return PARSE_STOP_VISITOR;
        }
        parse_return consume(VisitorHolder& visitor_holder, char const*& current) {
            while (!m_stack.empty()) {
                stack_elem& e = m_stack.back();
                switch (e.m_type) {
                case MSGPACK_CT_ARRAY_ITEM:
                    if (!visitor_holder.visitor().end_array_item()) {
                        --current;
                        return PARSE_STOP_VISITOR;
                    }
                    if (--e.m_rest == 0)  {
                        m_stack.pop_back();
                        if (!visitor_holder.visitor().end_array()) {
                            --current;
                            return PARSE_STOP_VISITOR;
                        }
                    }
                    else {
                        if (!visitor_holder.visitor().start_array_item()) return PARSE_STOP_VISITOR;
                        return PARSE_CONTINUE;
                    }
                    break;
                case MSGPACK_CT_MAP_KEY:
                    if (!visitor_holder.visitor().end_map_key()) {
                        --current;
                        return PARSE_STOP_VISITOR;
                    }
                    if (!visitor_holder.visitor().start_map_value()) return PARSE_STOP_VISITOR;
                    e.m_type = MSGPACK_CT_MAP_VALUE;
                    return PARSE_CONTINUE;
                case MSGPACK_CT_MAP_VALUE:
                    if (!visitor_holder.visitor().end_map_value()) {
                        --current;
                        return PARSE_STOP_VISITOR;
                    }
                    if (--e.m_rest == 0) {
                        m_stack.pop_back();
                        if (!visitor_holder.visitor().end_map()) {
                            --current;
                            return PARSE_STOP_VISITOR;
                        }
                    }
                    else {
                        e.m_type = MSGPACK_CT_MAP_KEY;
                        if (!visitor_holder.visitor().start_map_key()) return PARSE_STOP_VISITOR;
                        return PARSE_CONTINUE;
                    }
                    break;
                }
            }
            return PARSE_SUCCESS;
        }
        bool empty() const { return m_stack.empty(); }
        void clear() { m_stack.clear(); }
    private:
        std::vector<stack_elem> m_stack;
    };

    char const* m_start;
    char const* m_current;

    std::size_t m_trail;
    uint32_t m_cs;
    uint32_t m_num_elements;
    unpack_stack m_stack;
};

template <std::size_t N>
inline void check_ext_size(std::size_t /*size*/) {
}

template <>
inline void check_ext_size<4>(std::size_t size) {
    if (size == 0xffffffff) throw msgpack::ext_size_overflow("ext size overflow");
}

template <typename VisitorHolder>
inline parse_return context<VisitorHolder>::execute(const char* data, std::size_t len, std::size_t& off)
{
    assert(len >= off);

    m_start = data;
    m_current = data + off;
    const char* const pe = data + len;
    const char* n = MSGPACK_NULLPTR;

    msgpack::object obj;

    if(m_current == pe) {
        off = m_current - m_start;
        return PARSE_CONTINUE;
    }
    bool fixed_trail_again = false;
    do {
        if (m_cs == MSGPACK_CS_HEADER) {
            fixed_trail_again = false;
            int selector = *reinterpret_cast<const unsigned char*>(m_current);
            if (0x00 <= selector && selector <= 0x7f) { // Positive Fixnum
                uint8_t tmp = *reinterpret_cast<const uint8_t*>(m_current);
                bool visret = holder().visitor().visit_positive_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } else if(0xe0 <= selector && selector <= 0xff) { // Negative Fixnum
                int8_t tmp = *reinterpret_cast<const int8_t*>(m_current);
                bool visret = holder().visitor().visit_negative_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } else if (0xc4 <= selector && selector <= 0xdf) {
                const uint32_t trail[] = {
                    1, // bin     8  0xc4
                    2, // bin    16  0xc5
                    4, // bin    32  0xc6
                    1, // ext     8  0xc7
                    2, // ext    16  0xc8
                    4, // ext    32  0xc9
                    4, // float  32  0xca
                    8, // float  64  0xcb
                    1, // uint    8  0xcc
                    2, // uint   16  0xcd
                    4, // uint   32  0xce
                    8, // uint   64  0xcf
                    1, // int     8  0xd0
                    2, // int    16  0xd1
                    4, // int    32  0xd2
                    8, // int    64  0xd3
                    2, // fixext  1  0xd4
                    3, // fixext  2  0xd5
                    5, // fixext  4  0xd6
                    9, // fixext  8  0xd7
                    17,// fixext 16  0xd8
                    1, // str     8  0xd9
                    2, // str    16  0xda
                    4, // str    32  0xdb
                    2, // array  16  0xdc
                    4, // array  32  0xdd
                    2, // map    16  0xde
                    4, // map    32  0xdf
                };
                m_trail = trail[selector - 0xc4];
                m_cs = next_cs(m_current);
                fixed_trail_again = true;
            } else if(0xa0 <= selector && selector <= 0xbf) { // FixStr
                m_trail = static_cast<uint32_t>(*m_current) & 0x1f;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_str(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_STR_VALUE;
                    fixed_trail_again = true;
                }
            } else if(0x90 <= selector && selector <= 0x9f) { // FixArray
                parse_return ret = start_aggregate<fix_tag>(array_sv(holder()), array_ev(holder()), m_current, off);
                if (ret != PARSE_CONTINUE) return ret;
            } else if(0x80 <= selector && selector <= 0x8f) { // FixMap
                parse_return ret = start_aggregate<fix_tag>(map_sv(holder()), map_ev(holder()), m_current, off);
                if (ret != PARSE_CONTINUE) return ret;
            } else if(selector == 0xc2) { // false
                bool visret = holder().visitor().visit_boolean(false);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } else if(selector == 0xc3) { // true
                bool visret = holder().visitor().visit_boolean(true);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } else if(selector == 0xc0) { // nil
                bool visret = holder().visitor().visit_nil();
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } else {
                off = m_current - m_start;
                holder().visitor().parse_error(off - 1, off);
                return PARSE_PARSE_ERROR;
            }
            // end MSGPACK_CS_HEADER
        }
        if (m_cs != MSGPACK_CS_HEADER || fixed_trail_again) {
            if (fixed_trail_again) {
                ++m_current;
                fixed_trail_again = false;
            }
            if(static_cast<std::size_t>(pe - m_current) < m_trail) {
                off = m_current - m_start;
                return PARSE_CONTINUE;
            }
            n = m_current;
            m_current += m_trail - 1;
            switch(m_cs) {
                //case MSGPACK_CS_
                //case MSGPACK_CS_
            case MSGPACK_CS_FLOAT: {
                union { uint32_t i; float f; } mem;
                load<uint32_t>(mem.i, n);
                bool visret = holder().visitor().visit_float32(mem.f);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_DOUBLE: {
                union { uint64_t i; double f; } mem;
                load<uint64_t>(mem.i, n);
#if defined(TARGET_OS_IPHONE)
                // ok
#elif defined(__arm__) && !(__ARM_EABI__) // arm-oabi
                // https://github.com/msgpack/msgpack-perl/pull/1
                mem.i = (mem.i & 0xFFFFFFFFUL) << 32UL | (mem.i >> 32UL);
#endif
                bool visret = holder().visitor().visit_float64(mem.f);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_UINT_8: {
                uint8_t tmp;
                load<uint8_t>(tmp, n);
                bool visret = holder().visitor().visit_positive_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_UINT_16: {
                uint16_t tmp;
                load<uint16_t>(tmp, n);
                bool visret = holder().visitor().visit_positive_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_UINT_32: {
                uint32_t tmp;
                load<uint32_t>(tmp, n);
                bool visret = holder().visitor().visit_positive_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_UINT_64: {
                uint64_t tmp;
                load<uint64_t>(tmp, n);
                bool visret = holder().visitor().visit_positive_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_INT_8: {
                int8_t tmp;
                load<int8_t>(tmp, n);
                bool visret = holder().visitor().visit_negative_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_INT_16: {
                int16_t tmp;
                load<int16_t>(tmp, n);
                bool visret = holder().visitor().visit_negative_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_INT_32: {
                int32_t tmp;
                load<int32_t>(tmp, n);
                bool visret = holder().visitor().visit_negative_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_INT_64: {
                int64_t tmp;
                load<int64_t>(tmp, n);
                bool visret = holder().visitor().visit_negative_integer(tmp);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_FIXEXT_1: {
                bool visret = holder().visitor().visit_ext(n, 1+1);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_FIXEXT_2: {
                bool visret = holder().visitor().visit_ext(n, 2+1);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_FIXEXT_4: {
                bool visret = holder().visitor().visit_ext(n, 4+1);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_FIXEXT_8: {
                bool visret = holder().visitor().visit_ext(n, 8+1);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_FIXEXT_16: {
                bool visret = holder().visitor().visit_ext(n, 16+1);
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_STR_8: {
                uint8_t tmp;
                load<uint8_t>(tmp, n);
                m_trail = tmp;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_str(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_STR_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_BIN_8: {
                uint8_t tmp;
                load<uint8_t>(tmp, n);
                m_trail = tmp;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_bin(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_BIN_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_EXT_8: {
                uint8_t tmp;
                load<uint8_t>(tmp, n);
                m_trail = tmp + 1;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_ext(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_EXT_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_STR_16: {
                uint16_t tmp;
                load<uint16_t>(tmp, n);
                m_trail = tmp;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_str(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_STR_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_BIN_16: {
                uint16_t tmp;
                load<uint16_t>(tmp, n);
                m_trail = tmp;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_bin(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_BIN_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_EXT_16: {
                uint16_t tmp;
                load<uint16_t>(tmp, n);
                m_trail = tmp + 1;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_ext(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_EXT_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_STR_32: {
                uint32_t tmp;
                load<uint32_t>(tmp, n);
                m_trail = tmp;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_str(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_STR_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_BIN_32: {
                uint32_t tmp;
                load<uint32_t>(tmp, n);
                m_trail = tmp;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_bin(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_BIN_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_CS_EXT_32: {
                uint32_t tmp;
                load<uint32_t>(tmp, n);
                check_ext_size<sizeof(std::size_t)>(tmp);
                m_trail = tmp;
                ++m_trail;
                if(m_trail == 0) {
                    bool visret = holder().visitor().visit_ext(n, static_cast<uint32_t>(m_trail));
                    parse_return upr = after_visit_proc(visret, off);
                    if (upr != PARSE_CONTINUE) return upr;
                }
                else {
                    m_cs = MSGPACK_ACS_EXT_VALUE;
                    fixed_trail_again = true;
                }
            } break;
            case MSGPACK_ACS_STR_VALUE: {
                bool visret = holder().visitor().visit_str(n, static_cast<uint32_t>(m_trail));
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_ACS_BIN_VALUE: {
                bool visret = holder().visitor().visit_bin(n, static_cast<uint32_t>(m_trail));
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_ACS_EXT_VALUE: {
                bool visret = holder().visitor().visit_ext(n, static_cast<uint32_t>(m_trail));
                parse_return upr = after_visit_proc(visret, off);
                if (upr != PARSE_CONTINUE) return upr;
            } break;
            case MSGPACK_CS_ARRAY_16: {
                parse_return ret = start_aggregate<uint16_t>(array_sv(holder()), array_ev(holder()), n, off);
                if (ret != PARSE_CONTINUE) return ret;

            } break;
            case MSGPACK_CS_ARRAY_32: {
                parse_return ret = start_aggregate<uint32_t>(array_sv(holder()), array_ev(holder()), n, off);
                if (ret != PARSE_CONTINUE) return ret;
            } break;
            case MSGPACK_CS_MAP_16: {
                parse_return ret = start_aggregate<uint16_t>(map_sv(holder()), map_ev(holder()), n, off);
                if (ret != PARSE_CONTINUE) return ret;
            } break;
            case MSGPACK_CS_MAP_32: {
                parse_return ret = start_aggregate<uint32_t>(map_sv(holder()), map_ev(holder()), n, off);
                if (ret != PARSE_CONTINUE) return ret;
            } break;
            default:
                off = m_current - m_start;
                holder().visitor().parse_error(n - m_start - 1, n - m_start);
                return PARSE_PARSE_ERROR;
            }
        }
    } while(m_current != pe);

    off = m_current - m_start;
    return PARSE_CONTINUE;
}

template <typename Visitor>
struct parse_helper : detail::context<parse_helper<Visitor> > {
    parse_helper(Visitor& v):m_visitor(v) {}
    parse_return execute(const char* data, std::size_t len, std::size_t& off) {
        return detail::context<parse_helper<Visitor> >::execute(data, len, off);
    }
    Visitor& visitor() const { return m_visitor; }
    Visitor& m_visitor;
};

template <typename Visitor>
inline parse_return
parse_imp(const char* data, size_t len, size_t& off, Visitor& v) {
    std::size_t noff = off;
    if(len <= noff) {
        // FIXME
        v.insufficient_bytes(noff, noff);
        return PARSE_CONTINUE;
    }
    detail::parse_helper<Visitor> h(v);
    parse_return ret = h.execute(data, len, noff);
    off = noff;
    switch (ret) {
    case PARSE_CONTINUE:
        v.insufficient_bytes(noff - 1, noff);
        return ret;
    case PARSE_SUCCESS:
        if(noff < len) {
            return PARSE_EXTRA_BYTES;
        }
        return ret;
    default:
        return ret;
    }
}

} // detail

/// @cond
}  // MSGPACK_API_VERSION_NAMESPACE(v3)
/// @endcond

}  // namespace msgpack

#endif // MSGPACK_DEFAULT_API_VERSION >= 2

#endif // MSGPACK_V3_PARSE_HPP