1 /*
2 * Copyright (c) 2014-2020 Pavel Kalvoda <me@pavelkalvoda.com>
3 *
4 * libcbor is free software; you can redistribute it and/or modify
5 * it under the terms of the MIT license. See LICENSE for details.
6 */
7
8 #include "encoders.h"
9
10 #include <string.h>
11
_cbor_encode_uint8(uint8_t value,unsigned char * buffer,size_t buffer_size,uint8_t offset)12 size_t _cbor_encode_uint8(uint8_t value, unsigned char* buffer,
13 size_t buffer_size, uint8_t offset) {
14 if (value <= 23) {
15 if (buffer_size >= 1) {
16 buffer[0] = value + offset;
17 return 1;
18 }
19 } else {
20 if (buffer_size >= 2) {
21 buffer[0] = 0x18 + offset;
22 buffer[1] = value;
23 return 2;
24 }
25 }
26 return 0;
27 }
28
_cbor_encode_uint16(uint16_t value,unsigned char * buffer,size_t buffer_size,uint8_t offset)29 size_t _cbor_encode_uint16(uint16_t value, unsigned char* buffer,
30 size_t buffer_size, uint8_t offset) {
31 if (buffer_size < 3) {
32 return 0;
33 }
34 buffer[0] = 0x19 + offset;
35
36 #ifdef IS_BIG_ENDIAN
37 memcpy(buffer + 1, &value, 2);
38 #else
39 buffer[1] = (unsigned char)(value >> 8);
40 buffer[2] = (unsigned char)value;
41 #endif
42
43 return 3;
44 }
45
_cbor_encode_uint32(uint32_t value,unsigned char * buffer,size_t buffer_size,uint8_t offset)46 size_t _cbor_encode_uint32(uint32_t value, unsigned char* buffer,
47 size_t buffer_size, uint8_t offset) {
48 if (buffer_size < 5) {
49 return 0;
50 }
51 buffer[0] = 0x1A + offset;
52
53 #ifdef IS_BIG_ENDIAN
54 memcpy(buffer + 1, &value, 4);
55 #else
56 buffer[1] = (unsigned char)(value >> 24);
57 buffer[2] = (unsigned char)(value >> 16);
58 buffer[3] = (unsigned char)(value >> 8);
59 buffer[4] = (unsigned char)value;
60 #endif
61
62 return 5;
63 }
64
_cbor_encode_uint64(uint64_t value,unsigned char * buffer,size_t buffer_size,uint8_t offset)65 size_t _cbor_encode_uint64(uint64_t value, unsigned char* buffer,
66 size_t buffer_size, uint8_t offset) {
67 if (buffer_size >= 9) {
68 buffer[0] = 0x1B + offset;
69
70 #ifdef IS_BIG_ENDIAN
71 memcpy(buffer + 1, &value, 8);
72 #else
73 buffer[1] = (unsigned char)(value >> 56);
74 buffer[2] = (unsigned char)(value >> 48);
75 buffer[3] = (unsigned char)(value >> 40);
76 buffer[4] = (unsigned char)(value >> 32);
77 buffer[5] = (unsigned char)(value >> 24);
78 buffer[6] = (unsigned char)(value >> 16);
79 buffer[7] = (unsigned char)(value >> 8);
80 buffer[8] = (unsigned char)value;
81 #endif
82
83 return 9;
84 } else
85 return 0;
86 }
87
_cbor_encode_uint(uint64_t value,unsigned char * buffer,size_t buffer_size,uint8_t offset)88 size_t _cbor_encode_uint(uint64_t value, unsigned char* buffer,
89 size_t buffer_size, uint8_t offset) {
90 if (value <= UINT16_MAX)
91 if (value <= UINT8_MAX)
92 return _cbor_encode_uint8((uint8_t)value, buffer, buffer_size, offset);
93 else
94 return _cbor_encode_uint16((uint16_t)value, buffer, buffer_size, offset);
95 else if (value <= UINT32_MAX)
96 return _cbor_encode_uint32((uint32_t)value, buffer, buffer_size, offset);
97 else
98 return _cbor_encode_uint64((uint64_t)value, buffer, buffer_size, offset);
99 }
100