1 /*
2 * Copyright (c) 2009-2021, Google LLC
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are met:
7 * * Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * * Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * * Neither the name of Google LLC nor the
13 * names of its contributors may be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL Google LLC BE LIABLE FOR ANY DIRECT,
20 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
21 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
22 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
23 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
25 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 #include "upb/wire/reader.h"
29
30 #include "upb/wire/eps_copy_input_stream.h"
31 #include "upb/wire/types.h"
32
33 // Must be last.
34 #include "upb/port/def.inc"
35
36 UPB_NOINLINE _upb_WireReader_ReadLongVarintRet
_upb_WireReader_ReadLongVarint(const char * ptr,uint64_t val)37 _upb_WireReader_ReadLongVarint(const char* ptr, uint64_t val) {
38 _upb_WireReader_ReadLongVarintRet ret = {NULL, 0};
39 uint64_t byte;
40 int i;
41 for (i = 1; i < 10; i++) {
42 byte = (uint8_t)ptr[i];
43 val += (byte - 1) << (i * 7);
44 if (!(byte & 0x80)) {
45 ret.ptr = ptr + i + 1;
46 ret.val = val;
47 return ret;
48 }
49 }
50 return ret;
51 }
52
_upb_WireReader_SkipGroup(const char * ptr,uint32_t tag,int depth_limit,upb_EpsCopyInputStream * stream)53 const char* _upb_WireReader_SkipGroup(const char* ptr, uint32_t tag,
54 int depth_limit,
55 upb_EpsCopyInputStream* stream) {
56 if (--depth_limit == 0) return NULL;
57 uint32_t end_group_tag = (tag & ~7ULL) | kUpb_WireType_EndGroup;
58 while (!upb_EpsCopyInputStream_IsDone(stream, &ptr)) {
59 uint32_t tag;
60 ptr = upb_WireReader_ReadTag(ptr, &tag);
61 if (!ptr) return NULL;
62 if (tag == end_group_tag) return ptr;
63 ptr = _upb_WireReader_SkipValue(ptr, tag, depth_limit, stream);
64 if (!ptr) return NULL;
65 }
66 return ptr;
67 }
68