1 /****************************************************************************
2 **
3 ** Copyright (C) 2015 Intel Corporation
4 **
5 ** Permission is hereby granted, free of charge, to any person obtaining a copy
6 ** of this software and associated documentation files (the "Software"), to deal
7 ** in the Software without restriction, including without limitation the rights
8 ** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 ** copies of the Software, and to permit persons to whom the Software is
10 ** furnished to do so, subject to the following conditions:
11 **
12 ** The above copyright notice and this permission notice shall be included in
13 ** all copies or substantial portions of the Software.
14 **
15 ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 ** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 ** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 ** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 ** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 ** THE SOFTWARE.
22 **
23 ****************************************************************************/
24
25 #define _BSD_SOURCE 1
26 #define _DEFAULT_SOURCE 1
27 #include "cbor.h"
28 #include "cborconstants_p.h"
29 #include "compilersupport_p.h"
30 #include <stdlib.h>
31
get16(const uint8_t * ptr)32 static inline uint16_t get16(const uint8_t *ptr)
33 {
34 uint16_t result;
35 memcpy(&result, ptr, sizeof(result));
36 return cbor_ntohs(result);
37 }
38
get32(const uint8_t * ptr)39 static inline uint32_t get32(const uint8_t *ptr)
40 {
41 uint32_t result;
42 memcpy(&result, ptr, sizeof(result));
43 return cbor_ntohl(result);
44 }
45
get64(const uint8_t * ptr)46 static inline uint64_t get64(const uint8_t *ptr)
47 {
48 uint64_t result;
49 memcpy(&result, ptr, sizeof(result));
50 return cbor_ntohll(result);
51 }
52
extract_number(const CborParser * p,int * offset,uint64_t * len)53 static inline CborError extract_number(const CborParser *p, int *offset, uint64_t *len)
54 {
55 uint8_t additional_information = p->d->get8(p->d, *offset) & SmallValueMask;
56 ++*offset;
57 *len = 1;
58 if (additional_information < Value8Bit) {
59 *len = additional_information;
60 return CborNoError;
61 }
62 if (unlikely(additional_information > Value64Bit))
63 return CborErrorIllegalNumber;
64
65 size_t bytesNeeded = (size_t)(1 << (additional_information - Value8Bit));
66 if (unlikely(bytesNeeded > (size_t)(p->end - *offset))) {
67 return CborErrorUnexpectedEOF;
68 } else if (bytesNeeded == 1) {
69 *len = p->d->get8(p->d, *offset);
70 } else if (bytesNeeded == 2) {
71 *len = p->d->get16(p->d, *offset);
72 } else if (bytesNeeded == 4) {
73 *len = p->d->get32(p->d, *offset);
74 } else {
75 *len = p->d->get64(p->d, *offset);
76 }
77 *offset += bytesNeeded;
78 return CborNoError;
79 }
80
81
