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